GENWiki

Premier IT Outsourcing and Support Services within the UK

User Tools

Site Tools

Problem, Formatting or Query -  Send Feedback

Was this page helpful?-10+1


rfc:rfc4444

Network Working Group J. Parker, Ed. Request for Comments: 4444 Axiowave Networks Category: Standards Track April 2006

                  Management Information Base for
         Intermediate System to Intermediate System (IS-IS)

Status of This Memo

 This document specifies an Internet standards track protocol for the
 Internet community, and requests discussion and suggestions for
 improvements.  Please refer to the current edition of the "Internet
 Official Protocol Standards" (STD 1) for the standardization state
 and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

 Copyright (C) The Internet Society (2006).

Abstract

 This memo defines a portion of the Management Information Base (MIB)
 for use with network management protocols in the Internet community.
 Specifically, this document describes a MIB for the Intermediate
 System to Intermediate System (IS-IS) Routing protocol when it is
 used to construct routing tables for IP networks.

Table of Contents

 1. The Internet-Standard Management Framework . . . . . . . . . .   2
 2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
 3. Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .   5
 4. Definition of IS-IS MIB. . . . . . . . . . . . . . . . . . . .   6
 5. IANA Considerations. . . . . . . . . . . . . . . . . . . . . .  96
 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  96
 7. Security Considerations. . . . . . . . . . . . . . . . . . . .  96
 8. Normative References . . . . . . . . . . . . . . . . . . . . . 101
 9. Informative References . . . . . . . . . . . . . . . . . . . . 102

Parker Standards Track [Page 1] RFC 4444 IS-IS MIB April 2006

1. The Internet-Standard Management Framework

 For a detailed overview of the documents that describe the current
 Internet-Standard Management Framework, please refer to section 7 of
 RFC 3410 [RFC3410].
 Managed objects are accessed via a virtual information store, termed
 the Management Information Base or MIB.  MIB objects are generally
 accessed through the Simple Network Management Protocol (SNMP).
 Objects in the MIB are defined using the mechanisms defined in the
 Structure of Management Information (SMI).  This memo specifies a MIB
 module that is compliant to the SMIv2, which is described in STD 58,
 RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
 [RFC2580].

2. Overview

 This document describes a management information base for the
 Intermediate System to Intermediate System (IS-IS) Routing protocol,
 as described in ISO 10589 [ISO10589], when it is used to construct
 routing tables for IP networks, as described in RFC 1195 [RFC1195].
 The objects are mainly derived from the Guidelines for Definition of
 Managed Objects (GDMO) definitions in ISO 10589 and from the GDMO
 definitions in ISO 10733 [ISO10733].  There are also additional
 objects for managing the IP-specific functionality of Integrated IS-
 IS operation.
 This MIB imports definitions from SNMPv2-TC [RFC2579], SNMPv2-SMI
 [RFC2578], SNMPv2-CONF [RFC2580], SNMP-FRAMEWORK-MIB [RFC3411],
 DIFFSERV-MIB [RFC3289], IF-MIB [RFC2863], and INET-ADDRESS-MIB
 [RFC4001].  See the imports section of the MIB for the specific items
 imported.
 This MIB defines some objects to manage Mesh Groups, described in
 [RFC2973], and a three-way handshake for point-to-point adjacencies,
 described in [RFC3373].
 The IS-IS MIB defines the following objects:
 System-Wide Attributes
  1. isisSystem
       This table contains information specific to a single instance
       of the IS-IS protocol running on a router.

Parker Standards Track [Page 2] RFC 4444 IS-IS MIB April 2006

  1. isisManAreaAddr
       This table includes area addresses that are manually
       configured, which are used to control the associations formed
       between Level 1 Intermediate Systems.
  1. isisAreaAddr
       This table includes area addresses reported in relevant L1
       LSPs.
  1. isisSummAddr
       This table holds summary addresses configured for each Level 2
       instance of the IS-IS protocol running on a router.
  1. isisRedistributeAddr
       This table provides criteria to decide whether a route should
       be leaked from L2 to L1 when Domain Wide Prefix leaking is
       enabled.
  1. isisRouter
       This table holds the hostname and router ID for Intermediate
       Systems in the network.
  1. isisSysLevel
       This table contains information specific to a domain (Level 2)
       or an area (Level 1) of the IS-IS protocol.
  1. isisNextCircIndex
       This scalar is used to provide a unique circuit index.
 Circuit-specific Attributes
  1. isisCirc
       This table contains information specific to a point-to-point or
       a broadcast interface in the system.
  1. isisCircLevel
       This table contains information specific to Level 1 or Level 2
       of an interface.

Parker Standards Track [Page 3] RFC 4444 IS-IS MIB April 2006

 Counters
  1. isisSystemCounter
       Counters in the System table, such as number of times we have
       wrapped a sequence counter on one of our Link State PDUs.
  1. isisCircuitCounter
       Counters of events particular to a circuit, such as PDUs with
       an illegal value of the System ID field length.
  1. isisPacketCounter
       Counts of IS-IS Protocol PDUs broken down into packet type.
 Attributes associated with an Adjacency
  1. isisISAdj
       This table contains information about adjacencies to routers
       maintained by the protocol.  Entries in this table cannot be
       created by management action: they are established through the
       Hello protocol.
  1. isisISAdjAreaAddr
       This table contains the set of Area Addresses of neighboring
       Intermediate Systems, as reported in IIH PDUs.
  1. isisISAdjIPAddr
       This table contains the set of IP Addresses of neighboring
       Intermediate Systems, as reported in received IIH PDUs.
  1. isisISAdjProtSupp
       This table contains the set of protocols supported by
       neighboring Intermediate Systems, as reported in received IIH
       PDUs.

Parker Standards Track [Page 4] RFC 4444 IS-IS MIB April 2006

 Attributes Associated with Addresses
  1. isisRA
       The Reachable Address Table.
       This table contains information about an address prefix
       manually configured on the system or learned through another
       protocol.
  1. isisIPRA
       The IP Reachable Address Table.
       This table contains information about an IP reachable address
       manually configured on this system or learned from another
       protocol.
 Attributes Associated with Link State PDU Table
  1. isisLSPSummaryTable
       The Link State PDU Summary Table.
       This table contains information contained in the headers of
       Link State PDUs stored by the system.
  1. isisLSPTLVTable
       The Link State PDU TLV Table.
       This table holds the sequence of TLVs that make up an LSP
       fragment.
 Attributes Associated with a Notification
  1. isisNotification
       This table defines attributes that will be included when
       reporting IS-IS notifications.

3. Conventions

 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
 "OPTIONAL", when they appear in this document, are to be interpreted
 as described in BCP 14, RFC 2119 [RFC2119].

Parker Standards Track [Page 5] RFC 4444 IS-IS MIB April 2006

4. Definition of IS-IS MIB

ISIS-MIB DEFINITIONS ::= BEGIN

   IMPORTS
      TEXTUAL-CONVENTION, RowStatus, TruthValue, TimeStamp
              FROM SNMPv2-TC               -- RFC2579
      MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE,
          Unsigned32, Counter32, mib-2
              FROM SNMPv2-SMI              -- RFC2578
      MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP
              FROM SNMPv2-CONF             -- RFC2580
      SnmpAdminString
              FROM SNMP-FRAMEWORK-MIB      -- RFC2571
      IndexInteger, IndexIntegerNextFree
              FROM DIFFSERV-MIB            -- RFC3289
      InterfaceIndex
              FROM IF-MIB                  -- RFC2863
      InetAddressType, InetAddress, InetAddressPrefixLength
              FROM INET-ADDRESS-MIB;       -- RFC3291
  isisMIB MODULE-IDENTITY
      LAST-UPDATED "200604040000Z" -- April 4, 2006, midnight
      ORGANIZATION "IETF IS-IS for IP Internets Working Group"
      CONTACT-INFO
          "IS-IS for IP Internets working Group
           http://www.ietf.org/html.charters/isis-charter.html
           isis-wg@ietf.org
           Jeff Parker
           Department of Computer Science
           Middlebury College,
           Middlebury, Vermont 05753
           jeffp at middlbury dot edu"
      DESCRIPTION
           "This document describes a management information base for
           the IS-IS Routing protocol, as described in ISO 10589,
           when it is used to construct routing tables for IP
           networks, as described in RFC 1195.
           This document is based on a 1994 IETF document by Chris
           Gunner.  This version has been modified to include
           current syntax, to exclude portions of the protocol that
           are not relevant to IP, and to add management support for
           current practice.

Parker Standards Track [Page 6] RFC 4444 IS-IS MIB April 2006

           Copyright (C) The Internet Society (2006).  This version
           of this MIB module is part of RFC 4444; see the RFC
           itself for full legal notices."
      REVISION "200604040000Z" -- April 4, 2006, midnight
      DESCRIPTION
          "Initial version, published as RFC 4444."
  ::= { mib-2 138 }

– Top-level structure of the MIB

isisNotifications OBJECT IDENTIFIER ::= { isisMIB 0 } isisObjects OBJECT IDENTIFIER ::= { isisMIB 1 } isisConformance OBJECT IDENTIFIER ::= { isisMIB 2 }

– OBJECT IDENTIFIER definitions

– System wide attributes. isisSystem OBJECT IDENTIFIER ::= { isisObjects 1 }

– Attributes associated with the domain or with the area. isisSysLevel OBJECT IDENTIFIER ::= { isisObjects 2 }

– Attributes associated with one Circuit isisCirc OBJECT IDENTIFIER ::= { isisObjects 3 }

– Attributes associated with area or domain relevant within a Circuit. isisCircLevelValues OBJECT IDENTIFIER ::= { isisObjects 4 }

– System and circuit counters. isisCounters OBJECT IDENTIFIER ::= { isisObjects 5 }

– Attributes associated with an adjacent Protocol Peer. isisISAdj OBJECT IDENTIFIER ::= { isisObjects 6 }

– Attributes associated with a configured address. isisReachAddr OBJECT IDENTIFIER ::= { isisObjects 7 }

– Attributes associated with IP routes learned by – configuration or through another protocol. isisIPReachAddr OBJECT IDENTIFIER ::= { isisObjects 8 }

– The collection of Link State PDUs known to the Intermediate System isisLSPDataBase OBJECT IDENTIFIER ::= { isisObjects 9 }

– Objects included in Notifications. isisNotification OBJECT IDENTIFIER ::= { isisObjects 10 }

Parker Standards Track [Page 7] RFC 4444 IS-IS MIB April 2006

– Type definitions

  IsisOSINSAddress ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "OSI Network Service Address, e.g., NSAP, SNPA, or Network
           Entity Title"
      SYNTAX OCTET STRING (SIZE(0..20))
  IsisSystemID ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "The ID for an Intermediate System.  This should
           be unique within a network, and is included
           in all PDUs originated by an Intermediate System.
           The protocol does not place any meanings upon
           the bits, other than using ordering to break
           ties in electing a Designated IS on a LAN."
      REFERENCE "{ISIS.aoi systemId (119)}"
      SYNTAX OCTET STRING (SIZE(6))
  IsisLinkStatePDUID ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "The 8-byte Link State PDU (LSP) ID,
           consisting of the 6-byte SystemID of the
           originating IS; a one-byte PseudoNode ID,
           which is 0 unless the LSP represents the
           topology of a LAN; and a one-byte LSP
           fragment number that is issued in sequence,
           starting with 0.  Non-zero PseudoNode IDs
           need to be unique to the IS but need not
           match the IfIndex."
      REFERENCE "{See section 9.8 of ISO 10589}"
      SYNTAX OCTET STRING (SIZE(8))
  IsisAdminState ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "Type used in enabling and disabling a row."
      SYNTAX INTEGER
          {
              on(1),
              off(2)
          }
  IsisLSPBuffSize ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"

Parker Standards Track [Page 8] RFC 4444 IS-IS MIB April 2006

      STATUS current
      DESCRIPTION
          "Integer sub-range for maximum LSP size."
      SYNTAX Unsigned32 (512..16000)
  IsisLevelState ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "States of the IS-IS protocol."
      SYNTAX INTEGER
          {
              off (1),
              on (2),
              waiting (3),
              overloaded(4)
          }
  IsisSupportedProtocol ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "Types of network protocol supported by Integrated IS-IS.
           The values for ISO8473 and IP are those registered for
           these protocols in ISO TR9577."
      REFERENCE "{See section 5.3.1 of RFC 1195}"
      SYNTAX INTEGER
          {
              iso8473(129),
              ipV6(142),
              ip(204)
          }
  IsisDefaultMetric ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS current
      DESCRIPTION
          "Integer sub-range for default metric for single hop.
           ISO 10589 provides for 4 types of metric.  Only the
           'default' metric is used in practice."
      REFERENCE "{See section 7.2.2 of ISO 10589}"
      SYNTAX Unsigned32 (0..63)
  IsisWideMetric ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS current
      DESCRIPTION
          "Wide metric for IS Neighbors.  ISO 10589 provides a
           6-bit metric.  Traffic Engineering extensions provide
           24-bit metrics."

Parker Standards Track [Page 9] RFC 4444 IS-IS MIB April 2006

      REFERENCE "{See section 3 of RFC 3784}"
      SYNTAX Unsigned32 (0..16777215)
  IsisFullMetric ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS current
      DESCRIPTION
          "Full metric for IP Routes.  Traffic Engineering extensions
           provide 32-bit metrics."
      REFERENCE "{See section 4 of RFC 3784}"
      SYNTAX Unsigned32
  IsisMetricType ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "Is this an Internal or External Metric?"
      REFERENCE "{See section 7.2.2 of ISO 10589}"
      SYNTAX INTEGER
          {
              internal(1),
              external(2)
          }
  IsisMetricStyle ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "Do we use RFC 1195 style metrics or wide metrics?"
      REFERENCE "{See section 5 of RFC 3787}"
      SYNTAX INTEGER
          {
              narrow(1),
              wide(2),
              both(3)
          }
  IsisISLevel ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "Identifies a level."
      REFERENCE "{See definitions 3.6.1 and 3.6.11 of ISO 10589}"
      SYNTAX INTEGER
          {
              area(1),        -- L1
              domain(2)       -- L2
          }
  IsisLevel ::= TEXTUAL-CONVENTION
      STATUS current

Parker Standards Track [Page 10] RFC 4444 IS-IS MIB April 2006

      DESCRIPTION
          "Identifies one or more levels."
      REFERENCE "{See definitions 3.6.1 and 3.6.11 of ISO 10589}"
      SYNTAX INTEGER
          {
              level1(1),
              level2(2),
              level1and2(3)
          }
  IsisPDUHeader ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "A block to contain the header from a PDU."
      SYNTAX OCTET STRING (SIZE(0..64))
  IsisCircuitID ::= TEXTUAL-CONVENTION
      STATUS current
      DESCRIPTION
          "ID for a circuit."
      REFERENCE "{See section 7.2.7 of ISO 10589}"
      SYNTAX OCTET STRING (SIZE(0|7))
  IsisISPriority ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS current
      DESCRIPTION
          "Integer sub-range for IS-IS priority."
      REFERENCE "{See section 9.5 of ISO 10589}"
      SYNTAX Unsigned32 (0..127)
  IsisUnsigned16TC ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS current
      DESCRIPTION
          "An Unsigned32 further restricted to 16 bits.  Note that
           the ASN.1 BER encoding may still require 24 bits for
           some values."
      SYNTAX Unsigned32 (0..65535)
  IsisUnsigned8TC ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS current
      DESCRIPTION
          "An Unsigned32 further restricted to 8 bits.  Note that
           the ASN.1 BER encoding may still require 16 bits for
           some values."
      SYNTAX Unsigned32 (0..255)

Parker Standards Track [Page 11] RFC 4444 IS-IS MIB April 2006

– Behavior Definitions

– ResettingTimer behavior definition –

– "This behavior applies to objects that specify the interval – between events in the operation of the protocol state machine. – If the value of such an object is set to a new value while – the protocol state machine is in operation, the implementation – shall take the necessary steps to ensure that for any time – interval that was in progress when the value of the – corresponding object was changed, the next expiration of that – interval takes place the specified time after the original – start of that interval, or immediately, whichever is later. – The precision with which this time shall be implemented shall – be the same as that associated with the basic operation of – the timer object."

– ReplaceOnlyWhileDisabled behavior definition – "This behavior applies to objects that may not be modified – while the corresponding table row's variable of type – IsisAdminState is in state on."

– ManualOrAutomatic behavior definition – "This behavior applies to objects that are read-write – if the object was created manually. Objects that were – created automatically that have this behavior are – read-only.

  isisSysObject  OBJECT IDENTIFIER ::= { isisSystem 1 }
  isisSysVersion OBJECT-TYPE
      SYNTAX INTEGER
          {
              unknown(0),
              one(1)
          }
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The version number of the IS-IS protocol that
           is implemented."
      REFERENCE "{ISIS.aoi version (1)}"
      DEFVAL { one }
  ::= { isisSysObject 1 }
  isisSysLevelType OBJECT-TYPE
      SYNTAX IsisLevel

Parker Standards Track [Page 12] RFC 4444 IS-IS MIB April 2006

      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "At which levels is the Intermediate System
           running? This object may not be modified when
           the isisSysAdminState variable is in state 'on'
           for this Intermediate System.
           Configured values MUST survive an agent reboot."
      REFERENCE "{ISIS.aoi iSType (2)}"
      DEFVAL { level1and2 }
  ::= { isisSysObject 2 }
  isisSysID OBJECT-TYPE
      SYNTAX IsisSystemID
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "The ID for this Intermediate System.
           This value is appended to each of the
           area addresses to form the Network Entity Titles.
           The derivation of a value for this object is
           implementation specific.  Some implementations may
           automatically assign values and not permit an
           SNMP write, while others may require the value
           to be set manually.
           Configured values MUST survive an agent reboot."
      REFERENCE "{ISIS.aoi systemId (119)}"
  ::= { isisSysObject 3 }
  isisSysMaxPathSplits OBJECT-TYPE
      SYNTAX Unsigned32 (1..32)
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Maximum number of paths with equal routing metric value
           which it is permitted to split between.  This object
           may not be modified when the isisSysAdminState variable
           is in state 'on' for this Intermediate System.
           Configured values MUST survive an agent reboot."
      REFERENCE "{ISIS.aoi maximumPathSplits (3)}"
      DEFVAL { 2 }
  ::= { isisSysObject 4 }
  isisSysMaxLSPGenInt OBJECT-TYPE
      SYNTAX Unsigned32 (1..65235)

Parker Standards Track [Page 13] RFC 4444 IS-IS MIB April 2006

      UNITS "seconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Maximum interval, in seconds, between generated LSPs
           by this Intermediate System.  This object follows
           the ResettingTimer behavior.  The value must be
           greater than any value configured for
           isisSysLevelMinLSPGenInt, and should be at least 300
           seconds less than isisSysMaxAge.
           Configured values MUST survive an agent reboot."
      REFERENCE "{ISIS.aoi maximumLSPGenerationInterval (6)}"
      DEFVAL { 900 }
  ::= { isisSysObject 5 }
  isisSysPollESHelloRate OBJECT-TYPE
      SYNTAX IsisUnsigned16TC (1..65535)
      UNITS "seconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "The value, in seconds, to be used for the suggested ES
           configuration timer in ISH PDUs when soliciting the ES
           configuration.
           Configured values MUST survive an agent reboot."
      REFERENCE "{ISIS.aoi pollESHelloRate (13)}"
      DEFVAL { 50 }
  ::= { isisSysObject 6 }
  isisSysWaitTime OBJECT-TYPE
      SYNTAX IsisUnsigned16TC (1..65535)
      UNITS "seconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Number of seconds to delay in state 'waiting' before
           entering the state 'on'.  This object follows the
           ResettingTimer behavior.
           Configured values MUST survive an agent reboot."
      REFERENCE "{ISIS.aoi waitingTime (15)}"
      DEFVAL { 60 }
  ::= { isisSysObject 7 }
  isisSysAdminState OBJECT-TYPE
      SYNTAX IsisAdminState

Parker Standards Track [Page 14] RFC 4444 IS-IS MIB April 2006

      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "The administrative state of this Intermediate
           System.  Setting this object to the value 'on'
           when its current value is 'off' enables
           the Intermediate System.
           Configured values MUST survive an agent reboot."
      DEFVAL { off }
  ::= { isisSysObject 8 }
  isisSysL2toL1Leaking OBJECT-TYPE
      SYNTAX TruthValue
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "If true, allow the router to leak L2 routes into L1.
           Configured values MUST survive an agent reboot."
      DEFVAL { false }
  ::= { isisSysObject 9 }
  isisSysMaxAge OBJECT-TYPE
      SYNTAX IsisUnsigned16TC (350..65535)
      UNITS "seconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Value to place in RemainingLifeTime field of
           the LSPs we generate.
           This should be at least 300 seconds greater than
           isisSysMaxLSPGenInt.
           Configured values MUST survive an agent reboot."
      DEFVAL { 1200 }
  ::= { isisSysObject 10 }
  isisSysReceiveLSPBufferSize OBJECT-TYPE
      SYNTAX IsisUnsigned16TC (1492..16000)
      UNITS "bytes"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Size of the largest buffer we are designed or
           configured to store.  This should be at least
           as big as the maximum isisSysLevelOrigLSPBuffSize
           supported by the system.

Parker Standards Track [Page 15] RFC 4444 IS-IS MIB April 2006

           If resources allow, we will store and flood LSPs
           larger than isisSysReceiveLSPBufferSize, as this
           can help avoid problems in networks with different
           values for isisSysLevelOrigLSPBuffSize.
           Configured values MUST survive an agent reboot."
      DEFVAL { 1492 }
  ::= { isisSysObject 11 }
  isisSysProtSupported OBJECT-TYPE
      SYNTAX BITS {
                  iso8473 (0),
                  ipv4 (1),
                  ipv6 (2)
                }
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "This attribute contains the set of protocols
           supported by this Intermediate System."
  ::= { isisSysObject 12 }
  isisSysNotificationEnable OBJECT-TYPE
      SYNTAX TruthValue
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "If this object is set to true(1), then it enables
           the emission of IS-IS Notifications.  If it is
           set to false(2), these notifications are not sent.
           Configured values MUST survive an agent reboot."
      DEFVAL { true }
  ::= { isisSysObject 13 }

– The Level 1 Manual Area Address Table

  isisManAreaAddrTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisManAreaAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The set of manual area addresses configured on this
           Intermediate System.
           At least one row in which the value of
           isisManAreaAddrExistState is active must be present.
           The maximum number of rows in this table for

Parker Standards Track [Page 16] RFC 4444 IS-IS MIB April 2006

           which the object isisManAreaAddrExistState has the
           value active is 3.
           An attempt to create more than 3 rows of
           isisManAreaAddrEntry with state 'active' in one
           instance of the IS-IS protocol should
           return inconsistentValue."
      REFERENCE "{ISIS.aoi manualAreaAddresses (10)}"
  ::= { isisSystem 2 }
  isisManAreaAddrEntry OBJECT-TYPE
      SYNTAX IsisManAreaAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry contains one area address manually configured
           on this system.
           Dynamically created rows MUST survive an agent reboot."
      INDEX { isisManAreaAddr }
  ::= { isisManAreaAddrTable 1 }
  IsisManAreaAddrEntry ::=
      SEQUENCE {
          isisManAreaAddr
              IsisOSINSAddress,
          isisManAreaAddrExistState
              RowStatus
          }
  isisManAreaAddr OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "A manually configured area address for this system.
           Note: An index for the entry {1, {49.0001} active} in
           this table would be the ordered pair
           (1, (0x03 0x49 0x00 0x01)), as the length of an octet
           string is part of the OID."
  ::= { isisManAreaAddrEntry 1 }
  isisManAreaAddrExistState OBJECT-TYPE
      SYNTAX RowStatus
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION

Parker Standards Track [Page 17] RFC 4444 IS-IS MIB April 2006

          "The state of the isisManAreaAddrEntry.  If the
           isisSysAdminState for this Intermediate System is 'on' and
           an attempt is made to set this object to the value
           'destroy' or 'notInService' when this is the only
           isisManAreaAddrEntry in state 'active' for this
           Intermediate System should return inconsistentValue.
           A row entry cannot be modified when the value of this
           object is 'active'."
  ::= { isisManAreaAddrEntry 2 }

– The Level 1 Area Address Table

– The Level 1 Area Address Table contains the – union of the sets of relevant area addresses configured – or learned from Level 1 LSPs received by this Intermediate System.

  isisAreaAddrTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisAreaAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The union of the sets of area addresses reported in all
           Level 1 LSPs with fragment number zero generated by this
           Intermediate System, or received from other Intermediate
           Systems that are reachable via Level 1 routing."
      REFERENCE "{ISIS.aoi areaAddresses (18)}"
  ::= { isisSystem 3 }
  isisAreaAddrEntry OBJECT-TYPE
      SYNTAX IsisAreaAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry contains one area address reported in a
           Level 1 LSP generated or received by this Intermediate
           System.
           Dynamically learned rows do not survive an agent reboot."
      INDEX { isisAreaAddr }
  ::= { isisAreaAddrTable 1 }
  IsisAreaAddrEntry ::=
      SEQUENCE {
          isisAreaAddr
              IsisOSINSAddress
          }

Parker Standards Track [Page 18] RFC 4444 IS-IS MIB April 2006

  isisAreaAddr OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "An area address reported in a Level 1 LSP."
  ::= { isisAreaAddrEntry 1 }

– The Summary Address Table

– The Summary Address Table contains the set of summary – addresses manually configured for the Intermediate System. – – This is used to control leaking L1 routes into L2.

  isisSummAddrTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisSummAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The set of IP summary addresses to use in forming
           summary TLVs originated by this Intermediate System.
           An administrator may use a summary address to combine
           and modify IP Reachability announcements.  If the
           Intermediate system can reach any subset of the summary
           address, the summary address MUST be announced instead,
           at the configured metric."
  ::= { isisSystem 4 }
  isisSummAddrEntry OBJECT-TYPE
      SYNTAX IsisSummAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry contains one IP summary address.
           Dynamically created rows MUST survive an agent reboot.
           Implementers need to be aware that if the total number
           of elements (octets or sub-identifiers) in
           isisSummAddress and isisSummAddrPrefixLen is too great,
           then OIDs of column instances in this table will have
           more than 128 subidentifiers and cannot be accessed
           using SNMPv1, SNMPv2c, or SNMPv3."
      INDEX { isisSummAddressType,
              isisSummAddress,
              isisSummAddrPrefixLen }

Parker Standards Track [Page 19] RFC 4444 IS-IS MIB April 2006

  ::= { isisSummAddrTable 1 }
  IsisSummAddrEntry ::=
      SEQUENCE {
          isisSummAddressType
              InetAddressType,
          isisSummAddress
              InetAddress,
          isisSummAddrPrefixLen
              InetAddressPrefixLength,
          isisSummAddrExistState
              RowStatus,
          isisSummAddrMetric
              IsisDefaultMetric,
          isisSummAddrFullMetric
              IsisFullMetric
      }
  isisSummAddressType OBJECT-TYPE
      SYNTAX InetAddressType
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The Type of IP address for this summary address."
  ::= { isisSummAddrEntry 1 }
  isisSummAddress OBJECT-TYPE
      SYNTAX InetAddress
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The IP Address value for this summary address.
           The address must not contain any set host bits
           (bits set after the address prefix determined by
           isisSummAddrPrefixLen).
           The type of this address is determined by the value of
           the isisSummAddressType object."
  ::= { isisSummAddrEntry 2 }
  isisSummAddrPrefixLen OBJECT-TYPE
      SYNTAX InetAddressPrefixLength
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The Length of the IP NetMask for this summary address.
           The values for the index objects isisSummAddress and

Parker Standards Track [Page 20] RFC 4444 IS-IS MIB April 2006

           isisSummAddrPrefixLen must be consistent.  When the value
           of isisSummAddress (excluding the zone index, if one
           is present) is x, then the bitwise logical-AND
           of x with the value of the mask formed from the
           corresponding index object isisSummAddrPrefixLen MUST be
           equal to x.  If not, then the index pair is not
           consistent, and an inconsistentName error must be
           returned on SET or CREATE requests."
  ::= { isisSummAddrEntry 3 }
  isisSummAddrExistState OBJECT-TYPE
      SYNTAX RowStatus
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The existence state of this summary address.  Support
           for 'createAndWait' and 'notInService' is not required.
           A row entry cannot be modified when the value of this
           object is 'active'."
  ::= { isisSummAddrEntry 4 }
  isisSummAddrMetric OBJECT-TYPE
      SYNTAX IsisDefaultMetric
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The metric value to announce this summary
           address within LSPs generated by this system."
      DEFVAL { 20 }
  ::= { isisSummAddrEntry 5 }
  isisSummAddrFullMetric OBJECT-TYPE
      SYNTAX IsisFullMetric
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The wide metric value to announce this summary
           address within LSPs generated by this system."
      DEFVAL { 20 }
  ::= { isisSummAddrEntry 6 }

– The Redistribution table defines addresses that should be – leaked from L2 to L1 if isisSysL2toL1Leaking is enabled.

  isisRedistributeAddrTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisRedistributeAddrEntry
      MAX-ACCESS not-accessible

Parker Standards Track [Page 21] RFC 4444 IS-IS MIB April 2006

      STATUS current
      DESCRIPTION
          "This table provides criteria to decide if a route should
           be leaked from L2 to L1 when Domain Wide Prefix leaking is
           enabled.
           Addresses that match the summary mask in the table MUST
           be announced at L1 by routers when isisSysL2toL1Leaking
           is enabled.  Routes that fall into the ranges specified
           are announced as is, without being summarized.  Routes
           that do not match a summary mask are not announced."
  ::= { isisSystem 5 }
  isisRedistributeAddrEntry OBJECT-TYPE
      SYNTAX IsisRedistributeAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry contains one configured IP summary
           address to manage leaking L2 addresses into L1.
           Dynamically created rows MUST survive an agent reboot.
           Implementers need to be aware that if the total number
           of elements (octets or sub-identifiers) in
           isisRedistributeAddrAddress and
           isisRedistributeAddrPrefixLen is too great, then OIDs
           of column instances in this table will have more than
           128 subidentifiers and cannot be accessed using SNMPv1,
           SNMPv2c, or SNMPv3."
      INDEX { isisRedistributeAddrType,
              isisRedistributeAddrAddress,
              isisRedistributeAddrPrefixLen }
  ::= { isisRedistributeAddrTable 1 }
  IsisRedistributeAddrEntry ::=
      SEQUENCE {
          isisRedistributeAddrType
              InetAddressType,
          isisRedistributeAddrAddress
              InetAddress,
          isisRedistributeAddrPrefixLen
              InetAddressPrefixLength,
          isisRedistributeAddrExistState
              RowStatus
      }
  isisRedistributeAddrType OBJECT-TYPE

Parker Standards Track [Page 22] RFC 4444 IS-IS MIB April 2006

      SYNTAX InetAddressType
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The Type of IP address for this summary address."
  ::= { isisRedistributeAddrEntry 1 }
  isisRedistributeAddrAddress OBJECT-TYPE
      SYNTAX InetAddress
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The IP Address value for this summary address.
           The type of this address is determined by the
           value of the isisRedistributeAddrType object.
           The address must not contain any set host bits -
           bits set after the address prefix determined by
           isisRedistributeAddrPrefixLen."
  ::= { isisRedistributeAddrEntry 2 }
  isisRedistributeAddrPrefixLen OBJECT-TYPE
      SYNTAX InetAddressPrefixLength
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The Length of the IP NetMask for this summary address.
           The values for the index objects
           isisRedistributeAddrAddress and
           isisRedistributeAddrPrefixLen must be consistent.
           When the value of isisRedistributeAddrAddress
           (excluding the zone index, if one is present) is x,
           then the bitwise logical-AND of x with the value of
           the mask formed from the corresponding index object
           isisRedistributeAddrPrefixLen MUST be equal to x.
           If not, then the index pair is not consistent, and an
           inconsistentName error must be returned on SET or
           CREATE requests."
  ::= { isisRedistributeAddrEntry 3 }
  isisRedistributeAddrExistState OBJECT-TYPE
      SYNTAX RowStatus
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The existence state of this summary address.  Support

Parker Standards Track [Page 23] RFC 4444 IS-IS MIB April 2006

           for createAndWait and notInService is not required.
           A row entry cannot be modified when the value of this
           object is 'active'."
  ::= { isisRedistributeAddrEntry 4 }

– The Router Table keeps track of hostnames and router IDs – associated with Intermediate Systems in the area and domain.

  isisRouterTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisRouterEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The set of hostnames and router ID."
  ::= { isisSystem 6 }
  isisRouterEntry OBJECT-TYPE
      SYNTAX IsisRouterEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry tracks information about one Intermediate
           System at one level.
           Dynamically learned rows do not survive an agent reboot."
      INDEX { isisRouterSysID,
              isisRouterLevel }
  ::= { isisRouterTable 1 }
  IsisRouterEntry ::=
      SEQUENCE {
          isisRouterSysID
              IsisSystemID,
          isisRouterLevel
              IsisISLevel,
          isisRouterHostName
              SnmpAdminString,
          isisRouterID
              Unsigned32
      }
  isisRouterSysID OBJECT-TYPE
      SYNTAX IsisSystemID
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The System ID of the Intermediate System."

Parker Standards Track [Page 24] RFC 4444 IS-IS MIB April 2006

  ::= { isisRouterEntry 1 }
  isisRouterLevel OBJECT-TYPE
      SYNTAX IsisISLevel
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The level at which the information about this
           Intermediate System was received."
  ::= { isisRouterEntry 2 }
  isisRouterHostName OBJECT-TYPE
      SYNTAX SnmpAdminString
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The hostname listed in the LSP, or a zero-length
           string if none."
  ::= { isisRouterEntry 3 }
  isisRouterID OBJECT-TYPE
      SYNTAX Unsigned32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The Router ID found in the LSP, or zero if none."
  ::= { isisRouterEntry 4 }

– The System Level Table – This table captures level-specific information about the system

  isisSysLevelTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisSysLevelEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Level specific information about the System."
  ::= { isisSysLevel 1 }
  isisSysLevelEntry OBJECT-TYPE
      SYNTAX IsisSysLevelEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each row describes variables configured for Area or Domain.
           Configured values MUST survive an agent reboot."
      INDEX { isisSysLevelIndex }

Parker Standards Track [Page 25] RFC 4444 IS-IS MIB April 2006

  ::= { isisSysLevelTable 1 }
  IsisSysLevelEntry ::=
      SEQUENCE {
          isisSysLevelIndex
              IsisISLevel,
          isisSysLevelOrigLSPBuffSize
              IsisLSPBuffSize,
          isisSysLevelMinLSPGenInt
              IsisUnsigned16TC,
          isisSysLevelState
              IsisLevelState,
          isisSysLevelSetOverload
              TruthValue,
          isisSysLevelSetOverloadUntil
              Unsigned32,
          isisSysLevelMetricStyle
              IsisMetricStyle,
          isisSysLevelSPFConsiders
              IsisMetricStyle,
          isisSysLevelTEEnabled
              TruthValue
      }
  isisSysLevelIndex OBJECT-TYPE
      SYNTAX IsisISLevel
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The level that this entry describes."
  ::= { isisSysLevelEntry 1 }
  isisSysLevelOrigLSPBuffSize OBJECT-TYPE
      SYNTAX IsisLSPBuffSize
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "The maximum size of LSPs and SNPs originated by
           this Intermediate System at this level.  This
           object may not be modified when the isisSysAdminState
           variable is in state 'on' for this Intermediate System."
      REFERENCE "{ISIS.aoi originatingL1LSPBufferSize (9)}"
      DEFVAL { 1492 }
  ::= { isisSysLevelEntry 2 }
  isisSysLevelMinLSPGenInt OBJECT-TYPE
      SYNTAX IsisUnsigned16TC (1..65535)
      UNITS "seconds"

Parker Standards Track [Page 26] RFC 4444 IS-IS MIB April 2006

      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Minimum interval, in seconds, between successive
           generation of LSPs with the same LSPID at this level
           by this Intermediate System."
      REFERENCE "{ISIS.aoi minimumLSPGenerationInterval (11)}"
      DEFVAL { 30 }
  ::= { isisSysLevelEntry 3 }
  isisSysLevelState OBJECT-TYPE
      SYNTAX IsisLevelState
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The state of the database at this level.
           The value 'off' indicates that IS-IS is not active at
           this level.
           The value 'on' indicates that IS-IS is active at this
           level and is not overloaded.
           The value 'waiting' indicates a database that is low on
           an essential resource, such as memory.
           The administrator may force the state to 'overloaded'
           by setting the object isisSysLevelSetOverload.
           If the state is 'waiting' or 'overloaded', we
           originate LSPs with the overload bit set."
      REFERENCE "{ISIS.aoi l1State (17)}"
  ::= { isisSysLevelEntry 4 }
  isisSysLevelSetOverload OBJECT-TYPE
      SYNTAX TruthValue
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Administratively set the overload bit for the level.
           The overload bit MUST continue to be set if the
           implementation runs out of memory, independent of
           this variable.  It may also be set manually independent
           of this variable, using the isisSysLevelSetOverloadUntil
           object."
      DEFVAL { false }
  ::= { isisSysLevelEntry 5 }
  isisSysLevelSetOverloadUntil OBJECT-TYPE
      SYNTAX Unsigned32
      UNITS "Seconds until clearing manually set Overload Bit"
      MAX-ACCESS read-write
      STATUS current

Parker Standards Track [Page 27] RFC 4444 IS-IS MIB April 2006

      DESCRIPTION
          "If this object is non-zero, the overload bit is set at
           this level when the isisSysAdminState variable goes to
           state 'on' for this Intermediate System.  The overload bit
           remains set for isisSysLevelSetOverloadUntil seconds.
           When isisSysLevelSetOverloadUntil seconds have elapsed,
           the overload flag remains set if the implementation has
           run out of memory, or if it is set manually using the
           isisSysLevelSetOverload object.
           If isisSysLevelSetOverload is false, the system clears
           the overload bit when isisSysLevelSetOverloadUntil seconds
           have elapsed, if the system has not run out of memory."
  ::= { isisSysLevelEntry 6 }
  isisSysLevelMetricStyle OBJECT-TYPE
      SYNTAX IsisMetricStyle
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Which style of metric do we generate in our LSPs
           at this level?"
      DEFVAL { narrow }
  ::= { isisSysLevelEntry 7 }
  isisSysLevelSPFConsiders OBJECT-TYPE
      SYNTAX IsisMetricStyle
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Which style of metric do we consider in our
           SPF computation at this level?"
      DEFVAL { narrow }
  ::= { isisSysLevelEntry 8 }
  isisSysLevelTEEnabled OBJECT-TYPE
      SYNTAX TruthValue
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Do we do Traffic Engineering at this level?"
      DEFVAL { false }
  ::= { isisSysLevelEntry 9 }

– Static to provide next CircIndex

  isisNextCircIndex OBJECT-TYPE
      SYNTAX IndexIntegerNextFree

Parker Standards Track [Page 28] RFC 4444 IS-IS MIB April 2006

      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "This object is used to assist a management
           application in creating new rows in the
           isisCircTable.  If it is possible to create
           a new instance of isisCircEntry, then this
           object will contain a non-zero value that
           is not in use as the index of any row in the
           isisCircTable.  The network manager reads the
           value of this object and then (if the
           value read is non-zero) attempts to create
           the corresponding instance of isisCircEntry.
           If the set request fails with the code
           'inconsistentValue', then the process must be
           repeated;  if the set request succeeds, then
           the agent will change the value of this object
           according to an implementation-specific
           algorithm."
  ::= { isisCirc  1 }

– The Circuit Table – Each broadcast or point-to-point interface on the system – corresponds to one entry in the Circuit table. However, there – may be multiple X.25 DA circuit entries in the Circuit table – for a given X.25 interface.

  isisCircTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisCircEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The table of circuits used by this
           Intermediate System."
  ::= { isisCirc 2 }
  isisCircEntry OBJECT-TYPE
      SYNTAX IsisCircEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "An isisCircEntry exists for each circuit configured
           for Integrated IS-IS on this system.
           Dynamically created rows MUST survive an agent reboot."
      INDEX { isisCircIndex }
  ::= { isisCircTable 1 }

Parker Standards Track [Page 29] RFC 4444 IS-IS MIB April 2006

  IsisCircEntry ::=
      SEQUENCE {
          isisCircIndex
              IndexInteger,
          isisCircIfIndex
              InterfaceIndex,
          isisCircAdminState
              IsisAdminState,
          isisCircExistState
              RowStatus,
          isisCircType
              INTEGER,
          isisCircExtDomain
              TruthValue,
          isisCircLevelType
              IsisLevel,
          isisCircPassiveCircuit
              TruthValue,
          isisCircMeshGroupEnabled
              INTEGER,
          isisCircMeshGroup
              Unsigned32,
          isisCircSmallHellos
              TruthValue,
          isisCircLastUpTime
              TimeStamp,
          isisCirc3WayEnabled
              TruthValue,
          isisCircExtendedCircID
              Unsigned32
      }
  isisCircIndex OBJECT-TYPE
      SYNTAX IndexInteger
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "An index used to uniquely identify this circuit.
           When creating a row in this table, the
           isisNextCircIndex object should be retrieved,
           and its value should be specified as the value
           of this index using a SET operation.  A retrieved
           value of zero(0) indicates that no rows can be
           created at this time."
  ::= { isisCircEntry 1 }
  isisCircIfIndex OBJECT-TYPE
      SYNTAX InterfaceIndex

Parker Standards Track [Page 30] RFC 4444 IS-IS MIB April 2006

      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The value of ifIndex for the interface to which this
           circuit corresponds.  This object cannot be modified
           after creation."
  ::= { isisCircEntry 2 }
  isisCircAdminState OBJECT-TYPE
      SYNTAX IsisAdminState
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The administrative state of the circuit."
      DEFVAL { off }
  ::= { isisCircEntry 3 }
  isisCircExistState OBJECT-TYPE
      SYNTAX RowStatus
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The existence state of this circuit.  Setting the state
           to 'notInService' halts the generation and processing of
           IS-IS protocol PDUs on this circuit.  Setting the state
           to destroy will also erase any configuration associated
           with the circuit.  Support for 'createAndWait' and
           'notInService' is not required.
           A row entry cannot be modified when the value of this
           object is 'active'."
  ::= { isisCircEntry 4 }
  isisCircType OBJECT-TYPE
      SYNTAX INTEGER
          {
              broadcast(1),
              ptToPt(2),
              staticIn(3),
              staticOut(4),
              dA(5)
          }
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The type of the circuit.  This object follows the
           ReplaceOnlyWhileDisabled behavior.  The type specified
           must be compatible with the type of the interface defined

Parker Standards Track [Page 31] RFC 4444 IS-IS MIB April 2006

           by the value of isisCircIfIndex."
      REFERENCE "{ISIS.aoi type (33)}"
  ::= { isisCircEntry 5 }
  isisCircExtDomain OBJECT-TYPE
      SYNTAX TruthValue
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "If true, suppress normal transmission of and
           interpretation of Intra-domain IS-IS PDUs on this
           circuit."
      REFERENCE "{ISIS.aoi externalDomain (46)}"
      DEFVAL { false }
  ::= { isisCircEntry 6 }
  isisCircLevelType OBJECT-TYPE
      SYNTAX IsisLevel
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "Indicates which type of packets will be sent and
           accepted on this circuit.  The values set will be
           saved, but the values used will be modified by
           the settings of isisSysLevelType.  Thus, if the
           isisSysTpe is level2 and the isisCircLevelType
           for a circuit is level1, the circuit will not send
           or receive IS-IS packets.  This object follows the
           ReplaceOnlyWhileDisabled behavior."
      DEFVAL { level1and2 }
  ::= { isisCircEntry 7 }
  isisCircPassiveCircuit OBJECT-TYPE
      SYNTAX TruthValue
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "Should we include this interface in LSPs, even if
           it is not running the IS-IS Protocol?"
      DEFVAL { false }
  ::= { isisCircEntry 8 }
  isisCircMeshGroupEnabled OBJECT-TYPE
      SYNTAX INTEGER
          {
              inactive(1),
              blocked(2),
              set(3)

Parker Standards Track [Page 32] RFC 4444 IS-IS MIB April 2006

          }
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "Is this port a member of a mesh group, or is it
           blocked?  Circuits in the same mesh group act as a
           virtual multiaccess network.  LSPs seen on one circuit
           in a mesh group will not be flooded to another circuit
           in the same mesh group."
      REFERENCE "{ RFC 2973 }"
      DEFVAL { inactive }
  ::= { isisCircEntry 9 }
  isisCircMeshGroup OBJECT-TYPE
      SYNTAX Unsigned32
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "Circuits in the same mesh group act as a virtual
           multiaccess network.  LSPs seen on one circuit in
           a mesh group will not be flooded to another circuit
           in the same mesh group.  If isisCircMeshGroupEnabled
           is inactive or blocked, this value is ignored."
      REFERENCE "{ RFC 2973 }"
  ::= { isisCircEntry 10 }
  isisCircSmallHellos OBJECT-TYPE
      SYNTAX TruthValue
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "Can we send unpadded hellos on LAN circuits?  False
           means the LAN Hellos must be padded.
           Implementations should allow the administrator to read
           this value.  An implementation need not be able to
           support unpadded hellos to be conformant."
       DEFVAL { false }
  ::= { isisCircEntry 11 }
  isisCircLastUpTime OBJECT-TYPE
      SYNTAX TimeStamp
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "How long the circuit has been enabled, measured in
           hundredths of seconds since the last re-initialization
           of the network management subsystem; 0 if the
           circuit has never been 'on'."

Parker Standards Track [Page 33] RFC 4444 IS-IS MIB April 2006

  ::= { isisCircEntry 12 }
  isisCirc3WayEnabled OBJECT-TYPE
      SYNTAX TruthValue
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "Is this circuit enabled to run 3Way handshake?"
      DEFVAL { true }
  ::= { isisCircEntry 13 }
  isisCircExtendedCircID OBJECT-TYPE
      SYNTAX Unsigned32
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The value to be used as the extended circuit ID in
           3Way handshake.  This value is only used if
           isisCirc3WayEnabled is true, and it must be unique
           across all circuits on this IS."
  ::= { isisCircEntry 14 }

– The Circuit Level Table – This table captures level-specific information about a circuit

  isisCircLevelTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisCircLevelEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Level specific information about circuits used by IS-IS."
  ::= { isisCircLevelValues 1 }
  isisCircLevelEntry OBJECT-TYPE
      SYNTAX IsisCircLevelEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "An isisCircLevelEntry exists for each level on
           each circuit configured for Integrated IS-IS on
           this system.
           Configured values MUST survive an agent reboot."
      INDEX { isisCircIndex,
              isisCircLevelIndex }
  ::= { isisCircLevelTable 1 }
  IsisCircLevelEntry ::=

Parker Standards Track [Page 34] RFC 4444 IS-IS MIB April 2006

      SEQUENCE {
          isisCircLevelIndex
              IsisISLevel,
          isisCircLevelMetric
              IsisDefaultMetric,
          isisCircLevelWideMetric
              IsisWideMetric,
          isisCircLevelISPriority
              IsisISPriority,
          isisCircLevelIDOctet
              Unsigned32,
          isisCircLevelID
              IsisCircuitID,
          isisCircLevelDesIS
              IsisCircuitID,
          isisCircLevelHelloMultiplier
              Unsigned32,
          isisCircLevelHelloTimer
              Unsigned32,
          isisCircLevelDRHelloTimer
              Unsigned32,
          isisCircLevelLSPThrottle
              IsisUnsigned16TC,
          isisCircLevelMinLSPRetransInt
              Unsigned32,
          isisCircLevelCSNPInterval
              Unsigned32,
          isisCircLevelPartSNPInterval
              Unsigned32
      }
  isisCircLevelIndex OBJECT-TYPE
      SYNTAX IsisISLevel
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The level that this entry describes."
  ::= { isisCircLevelEntry 1 }
  isisCircLevelMetric OBJECT-TYPE
      SYNTAX IsisDefaultMetric
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "The metric value of this circuit for this level."
      REFERENCE "{ISIS.aoi l1DefaultMetric (35)}"
      DEFVAL { 10 }
  ::= { isisCircLevelEntry 2 }

Parker Standards Track [Page 35] RFC 4444 IS-IS MIB April 2006

  isisCircLevelWideMetric OBJECT-TYPE
      SYNTAX IsisWideMetric
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "The wide metric value of this circuit for this level."
      DEFVAL { 10 }
  ::= { isisCircLevelEntry 3 }
  isisCircLevelISPriority OBJECT-TYPE
      SYNTAX IsisISPriority
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "The priority for becoming the LAN-Designated
           Intermediate System at this level."
      REFERENCE "{ISIS.aoi l2IntermediateSystemPriority (73)}"
      DEFVAL { 64 }
  ::= { isisCircLevelEntry 4 }
  isisCircLevelIDOctet OBJECT-TYPE
      SYNTAX Unsigned32(0..255)
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "A one-byte identifier for the circuit selected by the
           Intermediate System.
           On point-to-point circuits, the value is used as the Local
           Circuit ID in point-to-point IIH PDUs transmitted on this
           circuit.  In this case, values of isisCircLevelIDOctet do
           not need to be unique.
           For broadcast circuits, the value is used to generate the
           LAN ID that will be used if this Intermediate System is
           elected as the Designated IS on this circuit.  The value
           is required to differ on LANs where the Intermediate System
           is the Designated Intermediate System."
  ::= { isisCircLevelEntry 5 }
  isisCircLevelID OBJECT-TYPE
      SYNTAX IsisCircuitID
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "On a point-to-point circuit with a fully initialized
           adjacency to a peer IS, the value of this object is
           the circuit ID negotiated during adjacency initialization.

Parker Standards Track [Page 36] RFC 4444 IS-IS MIB April 2006

           On a point to point circuit without such an adjacency,
           the value is the concatenation of the local system ID
           and the one-byte isisCircLevelIDOctet for this circuit,
           i.e., the value that would be proposed for the circuit ID.
           On other circuit types, the value returned is the zero-
           length OCTET STRING."
      REFERENCE "{ISIS.aoi ptPtCircuitID (51)}"
  ::= { isisCircLevelEntry 6 }
  isisCircLevelDesIS OBJECT-TYPE
      SYNTAX IsisCircuitID
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The ID of the LAN-Designated Intermediate System
           on this circuit at this level.  If, for any reason,
           this system is not partaking in the relevant
           Designated Intermediate System election process,
           then the value returned is the zero-length OCTET STRING."
      REFERENCE "{ISIS.aoi l2DesignatedIntermediateSystem (75)}"
  ::= { isisCircLevelEntry 7 }
  isisCircLevelHelloMultiplier OBJECT-TYPE
      SYNTAX Unsigned32 (2..100)
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "This value is multiplied by the corresponding HelloTimer,
           and the result in seconds (rounded up) is used as the
           holding time in transmitted hellos, to be used by
           receivers of hello packets from this IS."
      REFERENCE "{ISIS.aoi iSISHelloTimer (45)}"
      DEFVAL { 10 }
  ::= { isisCircLevelEntry 8 }
  isisCircLevelHelloTimer OBJECT-TYPE
      SYNTAX Unsigned32 (10..600000)
      UNITS "milliseconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Maximum period, in milliseconds, between IIH PDUs
           on multiaccess networks at this level for LANs.
           The value at L1 is used as the period between
           Hellos on L1L2 point-to-point circuits.  Setting
           this value at level 2 on an L1L2 point-to-point
           circuit will result in an error of InconsistentValue.

Parker Standards Track [Page 37] RFC 4444 IS-IS MIB April 2006

           This object follows the ResettingTimer behavior."
      REFERENCE "{ISIS.aoi iSISHelloTimer (45)}"
      DEFVAL { 3000 }
  ::= { isisCircLevelEntry 9 }
  isisCircLevelDRHelloTimer OBJECT-TYPE
      SYNTAX Unsigned32 (10..120000)
      UNITS "milliseconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Period, in milliseconds, between Hello PDUs on
           multiaccess networks when this IS is the Designated
           Intermediate System.  This object follows the
           ResettingTimer behavior."
      REFERENCE "{ISIS.aoi iSISHelloTimer (45)}"
      DEFVAL { 1000 }
  ::= { isisCircLevelEntry 10 }
  isisCircLevelLSPThrottle OBJECT-TYPE
      SYNTAX IsisUnsigned16TC (1..65535)
      UNITS "milliseconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Minimal interval of time, in milliseconds, between
           transmissions of LSPs on an interface at this level."
      REFERENCE
          "{ISIS.aoi minimumBroadcastLSPTransmissionInterval (5)}"
      DEFVAL { 30 }
  ::= { isisCircLevelEntry 11 }
  isisCircLevelMinLSPRetransInt OBJECT-TYPE
      SYNTAX Unsigned32 (1..300)
      UNITS "seconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Minimum interval, in seconds, between re-transmission of
           an LSP at this level.  This object follows the
           ResettingTimer behavior.
           Note that isisCircLevelLSPThrottle controls
           how fast we send back-to-back LSPs.  This variable
           controls how fast we re-send the same LSP."
      REFERENCE "{ISIS.aoi minimumLSPTransmissionInterval (5)}"
      DEFVAL { 5 }
  ::= { isisCircLevelEntry 12 }

Parker Standards Track [Page 38] RFC 4444 IS-IS MIB April 2006

  isisCircLevelCSNPInterval OBJECT-TYPE
      SYNTAX Unsigned32 (1..600)
      UNITS "seconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Interval of time, in seconds, between periodic
           transmission of a complete set of CSNPs on
           multiaccess networks if this router is the
           designated router at this level.
           This object follows the ResettingTimer behavior."
      REFERENCE "{ISIS.aoi completeSNPInterval (8)}"
      DEFVAL { 10 }
  ::= { isisCircLevelEntry 13 }
  isisCircLevelPartSNPInterval OBJECT-TYPE
      SYNTAX Unsigned32 (1..120)
      UNITS "seconds"
      MAX-ACCESS read-write
      STATUS current
      DESCRIPTION
          "Minimum interval, in seconds, between sending Partial
           Sequence Number PDUs at this level.  This object
           follows the ResettingTimer behavior."
      REFERENCE "{ISIS.aoi partialSNPInterval (14)}"
      DEFVAL { 2 }
  ::= { isisCircLevelEntry 14 }

– isisSystemCounterTable keeps track of system-wide events.

  isisSystemCounterTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisSystemCounterEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "System-wide counters for this Intermediate System."
  ::= { isisCounters 1 }
  isisSystemCounterEntry OBJECT-TYPE
      SYNTAX IsisSystemCounterEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "System-wide IS-IS counters."
      INDEX { isisSysStatLevel }
  ::= { isisSystemCounterTable 1 }
  IsisSystemCounterEntry ::=

Parker Standards Track [Page 39] RFC 4444 IS-IS MIB April 2006

      SEQUENCE {
          isisSysStatLevel
              IsisISLevel,
          isisSysStatCorrLSPs
              Counter32,
          isisSysStatAuthTypeFails
              Counter32,
          isisSysStatAuthFails
              Counter32,
          isisSysStatLSPDbaseOloads
              Counter32,
          isisSysStatManAddrDropFromAreas
              Counter32,
          isisSysStatAttmptToExMaxSeqNums
              Counter32,
          isisSysStatSeqNumSkips
              Counter32,
          isisSysStatOwnLSPPurges
              Counter32,
          isisSysStatIDFieldLenMismatches
              Counter32,
          isisSysStatPartChanges
              Counter32,
          isisSysStatSPFRuns
              Counter32,
          isisSysStatLSPErrors
              Counter32
      }
  isisSysStatLevel OBJECT-TYPE
      SYNTAX IsisISLevel
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The level that this entry describes."
  ::= { isisSystemCounterEntry 1 }
  isisSysStatCorrLSPs OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of corrupted in-memory frames"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Number of corrupted in-memory LSPs detected.
           LSPs received from the wire with a bad checksum
           are silently dropped and are not counted.

Parker Standards Track [Page 40] RFC 4444 IS-IS MIB April 2006

           LSPs received from the wire with parse errors
           are counted by isisSysStatLSPErrors."
      REFERENCE "{ISIS.aoi corruptedLSPsDetected (19)}"
  ::= { isisSystemCounterEntry 2 }
  isisSysStatAuthTypeFails OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of frames with authentication type mismatches"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of authentication type mismatches recognized
           by this Intermediate System."
  ::= { isisSystemCounterEntry 3 }
  isisSysStatAuthFails OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of frames with authentication key failures"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of authentication key failures recognized
           by this Intermediate System."
  ::= { isisSystemCounterEntry 4 }
  isisSysStatLSPDbaseOloads OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Number of times the LSP database has become
           overloaded."
      REFERENCE "{ISIS.aoi lSPL1DatabaseOverloads (20)}"
  ::= { isisSystemCounterEntry 5 }
  isisSysStatManAddrDropFromAreas OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Number of times a manual address has been dropped from
           the area."
      REFERENCE "{ISIS.aoi manualAddressesDroppedFromArea (21)}"
  ::= { isisSystemCounterEntry 6 }
  isisSysStatAttmptToExMaxSeqNums OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only

Parker Standards Track [Page 41] RFC 4444 IS-IS MIB April 2006

      STATUS current
      DESCRIPTION
          "Number of times the IS has attempted to exceed the
           maximum sequence number."
      REFERENCE
          "{ISIS.aoi attemptsToExceedmaximumSequenceNumber (22)}"
  ::= { isisSystemCounterEntry 7 }
  isisSysStatSeqNumSkips OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Number of times a sequence number skip has occurred."
      REFERENCE "{ISIS.aoi sequenceNumberSkips (23)}"
  ::= { isisSystemCounterEntry 8 }
  isisSysStatOwnLSPPurges OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Number of times a zero-aged copy of the system's own LSP
           is received from some other node."
      REFERENCE "{ISIS.aoi ownLSPPurges (24)}"
  ::= { isisSystemCounterEntry 9 }
  isisSysStatIDFieldLenMismatches OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of frames with ID length mismatches"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Number of times a PDU is received with a different value
           for ID field length from that of the receiving system."
      REFERENCE "{ISIS.aoi iDFieldLengthMismatches (25)}"
  ::= { isisSystemCounterEntry 10 }
  isisSysStatPartChanges OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Partition changes."
  ::= { isisSystemCounterEntry 11 }
  isisSysStatSPFRuns OBJECT-TYPE
      SYNTAX Counter32

Parker Standards Track [Page 42] RFC 4444 IS-IS MIB April 2006

      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Number of times we ran SPF at this level."
  ::= { isisSystemCounterEntry 12 }
  isisSysStatLSPErrors OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of frames with errors that we have received"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Number of LSPs with errors we have received."
  ::= { isisSystemCounterEntry 13 }

– isisCircuitCounterTable keeps track of events – specific to a circuit and a level

  isisCircuitCounterTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisCircuitCounterEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Circuit specific counters for this
           Intermediate System."
  ::= { isisCounters 2 }
  isisCircuitCounterEntry OBJECT-TYPE
      SYNTAX IsisCircuitCounterEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "An isisCircuitCounterEntry exists for each circuit
           used by Integrated IS-IS on this system."
      INDEX { isisCircIndex,
              isisCircuitType }
  ::= { isisCircuitCounterTable 1 }
  IsisCircuitCounterEntry ::= SEQUENCE {
        isisCircuitType
            INTEGER,
        isisCircAdjChanges
            Counter32,
        isisCircNumAdj
            Unsigned32,
        isisCircInitFails
            Counter32,
        isisCircRejAdjs

Parker Standards Track [Page 43] RFC 4444 IS-IS MIB April 2006

            Counter32,
        isisCircIDFieldLenMismatches
            Counter32,
        isisCircMaxAreaAddrMismatches
            Counter32,
        isisCircAuthTypeFails
            Counter32,
        isisCircAuthFails
            Counter32,
        isisCircLANDesISChanges
            Counter32
     }
  isisCircuitType OBJECT-TYPE
      SYNTAX INTEGER
          {
              lanlevel1(1),
              lanlevel2(2),
              p2pcircuit(3)
          }
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "What type of circuit saw these counts?
           The point-to-point Hello PDU includes
           both L1 and L2, and ISs form a single
           adjacency on point-to-point links.
           Thus, we combine counts on
           point-to-point links into one group."
  ::= { isisCircuitCounterEntry 1 }
  isisCircAdjChanges OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of times an adjacency state change has
           occurred on this circuit."
      REFERENCE "{ISIS.aoi changesInAdjacencyState (40)}"
  ::= { isisCircuitCounterEntry 2 }
  isisCircNumAdj OBJECT-TYPE
      SYNTAX Unsigned32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of adjacencies on this circuit."

Parker Standards Track [Page 44] RFC 4444 IS-IS MIB April 2006

      REFERENCE "{ISIS.aoi changesInAdjacencyState (40)}"
  ::= { isisCircuitCounterEntry 3 }
  isisCircInitFails OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of times initialization of this circuit has
           failed.  This counts events such as PPP NCP failures.
           Failures to form an adjacency are counted by
           isisCircRejAdjs."
  ::= { isisCircuitCounterEntry 4 }
  isisCircRejAdjs OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of times an adjacency has been rejected on
           this circuit."
      REFERENCE "{ISIS.aoi rejectedAdjacencies (42)}"
  ::= { isisCircuitCounterEntry 5 }
  isisCircIDFieldLenMismatches OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of frames with ID field length mismatch"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of times an IS-IS control PDU with an ID
           field length different from that for this system has been
           received."
      REFERENCE "{ISIS.aoi iDFieldLengthMismatches (25)}"
  ::= { isisCircuitCounterEntry 6 }
  isisCircMaxAreaAddrMismatches OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of times an IS-IS control PDU with a
           max area address field different from that for this
           system has been received."
      REFERENCE "{ISIS.aoi iDFieldLengthMismatches (25)}"
  ::= { isisCircuitCounterEntry 7 }
  isisCircAuthTypeFails OBJECT-TYPE

Parker Standards Track [Page 45] RFC 4444 IS-IS MIB April 2006

      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of times an IS-IS control PDU with
           an auth type field different from that for this
           system has been received."
  ::= { isisCircuitCounterEntry 8 }
  isisCircAuthFails OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of times an IS-IS control PDU with
           the correct auth type has failed to pass authentication
           validation."
  ::= { isisCircuitCounterEntry 9 }
  isisCircLANDesISChanges OBJECT-TYPE
      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of times the Designated IS has changed
           on this circuit at this level.  If the circuit is
           point to point, this count is zero."
  ::= { isisCircuitCounterEntry 10 }

– isisPacketCounterTable keeps track of the number of IS-IS – control packets sent and received at each level

  isisPacketCounterTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisPacketCounterEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Information about IS-IS protocol traffic at one level,
           on one circuit, in one direction."
  ::= { isisCounters 3 }
  isisPacketCounterEntry OBJECT-TYPE
      SYNTAX IsisPacketCounterEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Information about IS-IS protocol traffic at one level,
           on one circuit, in one direction."

Parker Standards Track [Page 46] RFC 4444 IS-IS MIB April 2006

      INDEX { isisCircIndex,
              isisPacketCountLevel,
              isisPacketCountDirection }
  ::= { isisPacketCounterTable 1 }
  IsisPacketCounterEntry ::=
      SEQUENCE {
          isisPacketCountLevel
              IsisISLevel,
          isisPacketCountDirection
              INTEGER,
          isisPacketCountIIHello
              Counter32,
          isisPacketCountISHello
              Counter32,
          isisPacketCountESHello
              Counter32,
          isisPacketCountLSP
              Counter32,
          isisPacketCountCSNP
              Counter32,
          isisPacketCountPSNP
              Counter32,
          isisPacketCountUnknown
              Counter32
  }
  isisPacketCountLevel OBJECT-TYPE
      SYNTAX IsisISLevel
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The level at which these PDU counts have been collected."
  ::= { isisPacketCounterEntry 1 }
  isisPacketCountDirection OBJECT-TYPE
      SYNTAX INTEGER
          {
              sending(1),
              receiving(2)
          }
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Were we sending or receiving these PDUs?"
  ::= { isisPacketCounterEntry 2 }
  isisPacketCountIIHello OBJECT-TYPE

Parker Standards Track [Page 47] RFC 4444 IS-IS MIB April 2006

      SYNTAX Counter32
      UNITS "Number of IS-IS Hellos frames seen in this direction
            at this level"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of IS-IS Hello PDUs seen in this
           direction at this level.
           Point-to-Point IIH PDUs are counted at
           the lowest enabled level: at L1 on L1 or L1L2 circuits,
           and at L2 otherwise."
      REFERENCE "{ISIS.aoi iSISControlPDUsSent (43)}"
  ::= { isisPacketCounterEntry 3 }
  isisPacketCountISHello OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of ES-IS frames seen in this direction at
           this level."
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of ES-IS Hello PDUs seen in this
           direction.  ISH PDUs are counted at the
           lowest enabled level: at L1 on L1 or L1L2
           circuits, and at L2 otherwise."
  ::= { isisPacketCounterEntry 4 }
  isisPacketCountESHello OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of ES Hello frames seen in this direction at
           this level"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of ES Hello PDUs seen in this
           direction.  ESH PDUs are counted at the
           lowest enabled level: at L1 on L1 or L1L2
           circuits, and at L2 otherwise."
  ::= { isisPacketCounterEntry 5 }
  isisPacketCountLSP OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of IS-IS LSP frames seen in this direction at
           this level"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION

Parker Standards Track [Page 48] RFC 4444 IS-IS MIB April 2006

          "The number of IS-IS LSPs seen in this
           direction at this level."
      REFERENCE "{ISIS.aoi iSISControlPDUsSent (43)}"
  ::= { isisPacketCounterEntry 6 }
  isisPacketCountCSNP OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of IS-IS CSNP frames seen in this direction at
           this level"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of IS-IS CSNPs seen in this
           direction at this level."
      REFERENCE "{ISIS.aoi iSISControlPDUsSent (43)}"
  ::= { isisPacketCounterEntry 7 }
  isisPacketCountPSNP OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of IS-IS PSNP frames seen in this direction at
           this level"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of IS-IS PSNPs seen in this
           direction at this level."
      REFERENCE "{ISIS.aoi iSISControlPDUsSent (43)}"
  ::= { isisPacketCounterEntry 8 }
  isisPacketCountUnknown OBJECT-TYPE
      SYNTAX Counter32
      UNITS "Number of unknown IS-IS frames seen at this level"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The number of unknown IS-IS PDUs seen
           at this level."
      REFERENCE "{ISIS.aoi iSISControlPDUsSent (43)}"
  ::= { isisPacketCounterEntry 9 }

– The IS Adjacency Table – – Each adjacency to an IS corresponds to one entry in this – table.

  isisISAdjTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisISAdjEntry
      MAX-ACCESS not-accessible

Parker Standards Track [Page 49] RFC 4444 IS-IS MIB April 2006

      STATUS current
      DESCRIPTION
          "The table of adjacencies to Intermediate Systems."
  ::= { isisISAdj 1 }
  isisISAdjEntry OBJECT-TYPE
      SYNTAX IsisISAdjEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry corresponds to one adjacency to an
           Intermediate System on this system.
           Dynamically learned rows do not survive an agent reboot."
      INDEX { isisCircIndex,
              isisISAdjIndex }
  ::= { isisISAdjTable 1 }
  IsisISAdjEntry ::=
      SEQUENCE {
          isisISAdjIndex
              Unsigned32,
          isisISAdjState
              INTEGER,
          isisISAdj3WayState
              INTEGER,
          isisISAdjNeighSNPAAddress
              IsisOSINSAddress,
          isisISAdjNeighSysType
              INTEGER,
          isisISAdjNeighSysID
              IsisSystemID,
          isisISAdjNbrExtendedCircID
              Unsigned32,
          isisISAdjUsage
              IsisLevel,
          isisISAdjHoldTimer
              IsisUnsigned16TC,
          isisISAdjNeighPriority
              IsisISPriority,
          isisISAdjLastUpTime
              TimeStamp
    }
  isisISAdjIndex OBJECT-TYPE
      SYNTAX Unsigned32(1..4294967295)
      MAX-ACCESS not-accessible
      STATUS current

Parker Standards Track [Page 50] RFC 4444 IS-IS MIB April 2006

      DESCRIPTION
          "A unique value identifying the IS adjacency from all
           other such adjacencies on this circuit.  This value is
           automatically assigned by the system when the adjacency
           is created."
  ::= { isisISAdjEntry 1 }
  isisISAdjState OBJECT-TYPE
      SYNTAX INTEGER
          {
               down (1),
               initializing (2),
               up (3),
               failed(4)
          }
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The state of the adjacency."
      REFERENCE "{ISIS.aoi adjacencyState (78)}"
  ::= { isisISAdjEntry 2 }
  isisISAdj3WayState OBJECT-TYPE
      SYNTAX INTEGER
          {
               up (0),
               initializing (1),
               down (2),
               failed (3)
          }
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The 3Way state of the adjacency.  These are picked
           to match the historical on-the-wire representation
           of the 3Way state and are not intended to match
           isisISAdjState."
      REFERENCE "{ RFC 3373 }"
  ::= { isisISAdjEntry 3 }
  isisISAdjNeighSNPAAddress OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The SNPA address of the neighboring system."
      REFERENCE "{ISIS.aoi neighbourSNPAAddress (79)}"
  ::= { isisISAdjEntry 4 }

Parker Standards Track [Page 51] RFC 4444 IS-IS MIB April 2006

  isisISAdjNeighSysType OBJECT-TYPE
      SYNTAX INTEGER
          {
              l1IntermediateSystem(1),
              l2IntermediateSystem(2),
              l1L2IntermediateSystem(3),
              unknown(4)
          }
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The type of the neighboring system."
      REFERENCE "{ISIS.aoi neighbourSystemType (80)}"
  ::= { isisISAdjEntry 5 }
  isisISAdjNeighSysID OBJECT-TYPE
      SYNTAX IsisSystemID
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The system ID of the neighboring Intermediate
           System."
      REFERENCE "{ISIS.aoi neighbourSystemIds (83)}"
  ::= { isisISAdjEntry 6 }
  isisISAdjNbrExtendedCircID OBJECT-TYPE
      SYNTAX Unsigned32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The 4-byte Extended Circuit ID learned from the
           Neighbor during 3-way handshake, or 0."
  ::= { isisISAdjEntry 7 }
  isisISAdjUsage OBJECT-TYPE
      SYNTAX IsisLevel
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "How is the adjacency used?  On a point-to-point link,
           this might be level1and2, but on a LAN, the usage will
           be level1 on the adjacency between peers at L1,
           and level2 for the adjacency between peers at L2."
      REFERENCE "{ISIS.aoi adjacencyUsage (82)}"
  ::= { isisISAdjEntry 8 }
  isisISAdjHoldTimer OBJECT-TYPE
      SYNTAX IsisUnsigned16TC (1..65535)

Parker Standards Track [Page 52] RFC 4444 IS-IS MIB April 2006

      UNITS "seconds"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The holding time, in seconds, for this adjacency.
           This value is based on received IIH PDUs and
           the elapsed time since receipt."
      REFERENCE "{ISIS.aoi holdingTimer (85)}"
  ::= { isisISAdjEntry 9 }
  isisISAdjNeighPriority OBJECT-TYPE
      SYNTAX IsisISPriority
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Priority of the neighboring Intermediate System for
           becoming the Designated Intermediate System."
      REFERENCE "{ISIS.aoi lANPriority (86)}"
  ::= { isisISAdjEntry 10 }
  isisISAdjLastUpTime OBJECT-TYPE
      SYNTAX TimeStamp
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "When the adjacency most recently entered the state 'up',
           measured in hundredths of a second since the last
           re-initialization of the network management subsystem.
           Holds 0 if the adjacency has never been in state 'up'."
  ::= { isisISAdjEntry 11 }

– The IS Adjacency Area Address Table

– The IS Adjacency Area Address Table contains the set of – Area Addresses of neighboring – Intermediate Systems as reported in IIH PDUs.

  isisISAdjAreaAddrTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisISAdjAreaAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "This table contains the set of Area Addresses of
           neighboring Intermediate Systems as reported in received
           IIH PDUs."
      REFERENCE "{ISIS.aoi areaAddressesOfNeighbour (84)}"
  ::= { isisISAdj 2 }

Parker Standards Track [Page 53] RFC 4444 IS-IS MIB April 2006

  isisISAdjAreaAddrEntry OBJECT-TYPE
      SYNTAX IsisISAdjAreaAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry contains one Area Address reported by a
           neighboring Intermediate System in its IIH PDUs.
           Dynamically learned rows do not survive an agent reboot."
      INDEX { isisCircIndex,
              isisISAdjIndex,
              isisISAdjAreaAddrIndex }
  ::= { isisISAdjAreaAddrTable 1 }
  IsisISAdjAreaAddrEntry ::=
      SEQUENCE {
          isisISAdjAreaAddrIndex
              Unsigned32,
          isisISAdjAreaAddress
              IsisOSINSAddress
          }
  isisISAdjAreaAddrIndex OBJECT-TYPE
      SYNTAX Unsigned32(1..4294967295)
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "An index for the areas associated with one neighbor.
           This provides a simple way to walk the table."
  ::= { isisISAdjAreaAddrEntry 1 }
  isisISAdjAreaAddress OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "One Area Address as reported in IIH PDUs received from
           the neighbor."
  ::= { isisISAdjAreaAddrEntry 2 }

– The IS Adjacency IP Address Table

– The IS Adjacency IP Address Table contains the – set of IP Addresses of neighboring Intermediate Systems – as reported in received IIH PDUs.

  isisISAdjIPAddrTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisISAdjIPAddrEntry

Parker Standards Track [Page 54] RFC 4444 IS-IS MIB April 2006

      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "This table contains the set of IP Addresses of
           neighboring Intermediate Systems as reported in received
           IIH PDUs."
  ::= { isisISAdj 3 }
  isisISAdjIPAddrEntry OBJECT-TYPE
      SYNTAX IsisISAdjIPAddrEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry contains one IP Address reported by a
           neighboring Intermediate System in its IIH PDUs.
           Dynamically learned rows do not survive an agent reboot."
      INDEX { isisCircIndex,
              isisISAdjIndex,
              isisISAdjIPAddrIndex
              }
  ::= { isisISAdjIPAddrTable 1 }
  IsisISAdjIPAddrEntry ::=
      SEQUENCE {
          isisISAdjIPAddrIndex
              Unsigned32,
          isisISAdjIPAddrType
               InetAddressType,
          isisISAdjIPAddrAddress
              InetAddress
      }
  isisISAdjIPAddrIndex OBJECT-TYPE
      SYNTAX Unsigned32(1..4294967295)
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "An index to this table that identifies the IP addresses
           to which this entry belongs."
  ::= { isisISAdjIPAddrEntry 1 }
  isisISAdjIPAddrType OBJECT-TYPE
      SYNTAX InetAddressType
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The type of one IP Address as reported in IIH PDUs

Parker Standards Track [Page 55] RFC 4444 IS-IS MIB April 2006

           received from the neighbor."
  ::= { isisISAdjIPAddrEntry 2 }
  isisISAdjIPAddrAddress OBJECT-TYPE
      SYNTAX InetAddress
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "One IP Address as reported in IIH PDUs received from the
           neighbor.
           The type of this address is determined by the value of
           the isisISAdjIPAddrType object."
  ::= { isisISAdjIPAddrEntry 3 }

– The IS Adjacency Protocol Supported Table – – The IS Adjacency Protocol Supported Table contains the set of – protocols supported by neighboring – Intermediate Systems as reported in received IIH PDUs.

  isisISAdjProtSuppTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisISAdjProtSuppEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "This table contains the set of protocols supported by
           neighboring Intermediate Systems as reported in received
           IIH PDUs."
  ::= { isisISAdj 4 }
  isisISAdjProtSuppEntry OBJECT-TYPE
      SYNTAX IsisISAdjProtSuppEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry contains one protocol supported by a
           neighboring Intermediate System as reported in its IIH
           PDUs.
           Dynamically learned rows do not survive an agent reboot."
      INDEX {  isisCircIndex,
               isisISAdjIndex,
               isisISAdjProtSuppProtocol }
  ::= { isisISAdjProtSuppTable 1 }
  IsisISAdjProtSuppEntry ::=
      SEQUENCE {

Parker Standards Track [Page 56] RFC 4444 IS-IS MIB April 2006

          isisISAdjProtSuppProtocol
              IsisSupportedProtocol
      }
  isisISAdjProtSuppProtocol OBJECT-TYPE
      SYNTAX IsisSupportedProtocol
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "One supported protocol as reported in IIH PDUs received
           from the neighbor."
  ::= { isisISAdjProtSuppEntry 1 }

– The Reachable Address Group – – The Reachable Address Table – Each entry records information about a reachable address – (NSAP or address prefix) manually configured on the system – or learned through another protocol.

  isisRATable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisRAEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The table of Reachable Addresses to NSAPs or Address
           Prefixes."
  ::= { isisReachAddr 1 }
  isisRAEntry OBJECT-TYPE
      SYNTAX IsisRAEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry defines a configured Reachable Address
           to an NSAP or Address Prefix.
           Dynamically created rows MUST survive an agent reboot."
      INDEX { isisCircIndex,
              isisRAIndex }
  ::= { isisRATable 1 }
  IsisRAEntry ::=
      SEQUENCE {
          isisRAIndex
              Unsigned32,
          isisRAExistState
              RowStatus,

Parker Standards Track [Page 57] RFC 4444 IS-IS MIB April 2006

          isisRAAdminState
              IsisAdminState,
          isisRAAddrPrefix
              IsisOSINSAddress,
          isisRAMapType
              INTEGER,
          isisRAMetric
              IsisDefaultMetric,
          isisRAMetricType
              IsisMetricType,
          isisRASNPAAddress
              IsisOSINSAddress,
          isisRASNPAMask
              IsisOSINSAddress,
          isisRASNPAPrefix
              IsisOSINSAddress,
          isisRAType
              INTEGER
      }
  isisRAIndex OBJECT-TYPE
      SYNTAX Unsigned32(1..4294967295)
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The identifier for this isisRAEntry.  This value must be
           unique amongst all Reachable Addresses on the same parent
           Circuit."
  ::= { isisRAEntry 1 }
  isisRAExistState OBJECT-TYPE
      SYNTAX RowStatus
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The existence state of this Reachable Address.  This
           object follows the ManualOrAutomatic behaviors.  Support
           for 'createAndWait' and 'notInService' is not required.
           A row entry cannot be modified when the value of this
           object is 'active'."
  ::= { isisRAEntry 2 }
  isisRAAdminState OBJECT-TYPE
      SYNTAX IsisAdminState
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION

Parker Standards Track [Page 58] RFC 4444 IS-IS MIB April 2006

          "The administrative state of the Reachable Address.  This
           object follows the ManualOrAutomatic behaviors."
      DEFVAL { off }
  ::= { isisRAEntry 3 }
  isisRAAddrPrefix OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The destination of this Reachable Address.  This is an
           Address Prefix.  This object follows the
           ReplaceOnlyWhileDisabled and ManualOrAutomatic
           behaviors."
      REFERENCE "{ISIS.aoi addressPrefix (98)}"
  ::= { isisRAEntry 4 }
  isisRAMapType OBJECT-TYPE
      SYNTAX INTEGER
          {
              none (1),
              explicit (2),
              extractIDI (3),
              extractDSP (4)
          }
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The type of mapping to be employed to ascertain the SNPA
           Address that should be used in forwarding PDUs for this
           Reachable Address prefix.  This object follows the
           ManualOrAutomatic behavior.  The following values of
           mapping type are defined:
               none: The mapping is null because the neighbor SNPA is
                     implicit by nature of the subnetwork (e.g., a
                     point-to-point linkage).
               explicit: The subnetwork addresses in the object
                     isisRASNPAAddress are to be used.
               extractIDI: The SNPA is embedded in the IDI of
                     the destination NSAP Address.  The mapping
                     algorithm extracts the SNPA to be used
                     according to the format and encoding rules of
                     ISO8473/Add2.  This SNPA extraction algorithm can
                     be used in conjunction with Reachable Address
                     prefixes from the X.121, F.69, E.163, and E.164

Parker Standards Track [Page 59] RFC 4444 IS-IS MIB April 2006

                     addressing subdomains.
               extractDSP: All, or a suffix, of the SNPA is embedded
                     in the DSP of the destination address.  This SNPA
                     extraction algorithm extracts the embedded
                     subnetwork addressing information by performing a
                     logical AND of the isisRASNPAMask object value
                     with the destination address.  The part of the
                     SNPA extracted from the destination NSAP is
                     appended to the isisRASNPAPrefix object value to
                     form the next hop subnetwork addressing
                     information."
      REFERENCE "{ISO10589-ISIS.aoi mappingType (107)}"
  ::= { isisRAEntry 5 }
  isisRAMetric OBJECT-TYPE
      SYNTAX IsisDefaultMetric
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The metric value for reaching the specified
           prefix over this circuit.  This object follows the
           ManualOrAutomatic behavior."
      REFERENCE "{ISIS.aoi DefaultMetric (99)}"
      DEFVAL { 20 }
  ::= { isisRAEntry 6 }
  isisRAMetricType OBJECT-TYPE
      SYNTAX IsisMetricType
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "Indicates whether the metric is internal or
           external.  This object follows the ManualOrAutomatic
           behavior."
      REFERENCE "{ISIS.aoi DefaultMetricType (103)}"
      DEFVAL { internal }
  ::= { isisRAEntry 7 }
  isisRASNPAAddress OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The SNPA Address to which a PDU may be forwarded in
           order to reach a destination that matches the address
           prefix of the Reachable Address.  This object follows the

Parker Standards Track [Page 60] RFC 4444 IS-IS MIB April 2006

           ManualOrAutomatic behavior."
      REFERENCE "{ISIS.aoi sNPAAddresses (109)}"

– Note only one address may be specified per Reachable Address – in the MIB

      DEFVAL { ''H }
  ::= { isisRAEntry 8 }
  isisRASNPAMask OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "A bit mask with 1 bit indicating the positions in the
           effective destination address from which embedded SNPA
           information is to be extracted.  For the extraction, the
           first octet of the isisRASNPAMask object value is aligned
           with the first octet (AFI) of the NSAP Address.  If the
           isisRASNPAMask object value and NSAP Address are of
           different lengths, the shorter of the two is logically
           padded with zeros before performing the extraction.  This
           object follows the ManualOrAutomatic behavior."
      REFERENCE "{ISIS.aoi sNPAMask (122)}"
      DEFVAL { '00'H }
  ::= { isisRAEntry 9 }
  isisRASNPAPrefix OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "A fixed SNPA prefix for use when the isisRAMapType is
           extractDSP.  The SNPA Address to use is formed by
           concatenating the fixed SNPA prefix with a variable SNPA
           part that is extracted from the effective destination
           address.  For Reachable Address prefixes in which the
           entire SNPA is embedded in the DSP, the SNPA Prefix shall
           be null.  This object follows the ManualOrAutomatic
           behavior."
      REFERENCE "{ISIS.aoi sNPAPrefix (123)}"
      DEFVAL { '00'H }
  ::= { isisRAEntry 10 }
  isisRAType OBJECT-TYPE
      SYNTAX INTEGER
          {
              manual (1),
              automatic (2)
          }

Parker Standards Track [Page 61] RFC 4444 IS-IS MIB April 2006

      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The type of Reachable address.  Those of type
           manual are created by the network manager.  Those
           of type automatic are created through propagation
           of routing information from another routing
           protocol (e.g., IDRP). "
      DEFVAL {manual}
  ::= {isisRAEntry 11 }

– The IP Reachable Address Table

– Each entry records information about one IP reachable – address manually configured on this system or learned from – another protocol.

  isisIPRATable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisIPRAEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The table of IP Reachable Addresses to networks,
           subnetworks, or hosts either manually configured or
           learned from another protocol."
  ::= { isisIPReachAddr 1 }
  isisIPRAEntry OBJECT-TYPE
      SYNTAX IsisIPRAEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry defines an IP Reachable Address to a network,
           subnetwork, or host.
           Each IP Reachable Address may have multiple entries in the
           table, one for each equal cost path to the reachable
           address.
           Dynamically created rows MUST survive an agent reboot.
           Implementers need to be aware that if the total number
           of elements (octets or sub-identifiers) in
           isisIPRADestr, isisIPRADestPrefixLen, and
           isisIPRANextHopIndex is too great, then OIDs of column
           instances in this table will have more than 128
           subidentifiers and cannot be accessed using SNMPv1,

Parker Standards Track [Page 62] RFC 4444 IS-IS MIB April 2006

           SNMPv2c, or SNMPv3."
      INDEX {  isisSysLevelIndex,
               isisIPRADestType,
               isisIPRADest,
               isisIPRADestPrefixLen,
               isisIPRANextHopIndex }
  ::= { isisIPRATable 1 }
  IsisIPRAEntry ::=
      SEQUENCE {
          isisIPRADestType
              InetAddressType,
          isisIPRADest
              InetAddress,
          isisIPRADestPrefixLen
              InetAddressPrefixLength,
          isisIPRANextHopIndex
              Unsigned32,
          isisIPRANextHopType
              InetAddressType,
          isisIPRANextHop
              InetAddress,
          isisIPRAType
              INTEGER,
          isisIPRAExistState
              RowStatus,
          isisIPRAAdminState
              IsisAdminState,
          isisIPRAMetric
              IsisDefaultMetric,
          isisIPRAMetricType
              IsisMetricType,
          isisIPRAFullMetric
              IsisFullMetric,
          isisIPRASNPAAddress
              IsisOSINSAddress,
          isisIPRASourceType
              INTEGER
      }
  isisIPRADestType OBJECT-TYPE
      SYNTAX InetAddressType
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The type of this IP Reachable Address."
  ::= { isisIPRAEntry 1 }

Parker Standards Track [Page 63] RFC 4444 IS-IS MIB April 2006

  isisIPRADest OBJECT-TYPE
      SYNTAX InetAddress
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The destination of this IP Reachable Address.  This is
           a network address, subnetwork address, or host
           address.
           The type of this address is determined by the value of
           the isisIPRADestType object."
  ::= { isisIPRAEntry 2 }
  isisIPRADestPrefixLen OBJECT-TYPE
      SYNTAX InetAddressPrefixLength
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The length of the IP Netmask for Reachability Address.
           The values for the index objects isisIPRADest and
           isisIPRADestPrefixLen must be consistent.  When the value
           of isisIPRADest (excluding the zone index, if one
           is present) is x, then the bitwise logical-AND
           of x with the value of the mask formed from the
           corresponding index object isisIPRADestPrefixLen MUST be
           equal to x.  If not, then the index pair is not
           consistent, and an inconsistentName error must be
           returned on SET or CREATE requests."
  ::= { isisIPRAEntry 3 }
  isisIPRANextHopIndex OBJECT-TYPE
      SYNTAX Unsigned32(1..4294967295)
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Index of next hop.  Used when there are multiple Equal
           Cost Multipath alternatives for the same destination."
  ::= { isisIPRAEntry 4 }
  isisIPRANextHopType OBJECT-TYPE
      SYNTAX InetAddressType
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The type of the IP next hop address."
  ::= { isisIPRAEntry 5 }

Parker Standards Track [Page 64] RFC 4444 IS-IS MIB April 2006

  isisIPRANextHop OBJECT-TYPE
      SYNTAX InetAddress
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The IP next hop to this destination.
           The type of this address is determined by the value of
           the isisIPRANextHopType object."
  ::= { isisIPRAEntry 6 }
  isisIPRAType OBJECT-TYPE
      SYNTAX INTEGER
          {
              manual (1),
              automatic (2)
          }
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The type of this IP Reachable Address.  Those of type
           manual are created by the network manager.  Those of type
           automatic are created through propagation of routing
           information from another routing protocol.  This object
           follows the ManualOrAutomatic behavior."
  ::= { isisIPRAEntry 7 }
  isisIPRAExistState OBJECT-TYPE
      SYNTAX RowStatus
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The state of this IP Reachable Address.  This object
           follows the ExistenceState and ManualOrAutomatic
           behaviors.  Support for 'createAndWait' and
           'notInService' is not required.
           A row entry cannot be modified when the value of this
           object is 'active'."
  ::= { isisIPRAEntry 8 }
  isisIPRAAdminState OBJECT-TYPE
      SYNTAX IsisAdminState
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The administrative state of the IP Reachable Address.  This
           object follows the IsisAdminState and ManualOrAutomatic

Parker Standards Track [Page 65] RFC 4444 IS-IS MIB April 2006

           behaviors."
      DEFVAL { off }
  ::= { isisIPRAEntry 9 }
  isisIPRAMetric OBJECT-TYPE
      SYNTAX IsisDefaultMetric
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The metric value for reaching the specified
           destination over this circuit.  This object follows the
           ManualOrAutomatic behavior."
      DEFVAL { 10 }
  ::= { isisIPRAEntry 10 }
  isisIPRAMetricType OBJECT-TYPE
      SYNTAX IsisMetricType
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "Indicates whether the metric is internal or
           external.  This object follows the ManualOrAutomatic
           behavior."
      DEFVAL { internal }
  ::= { isisIPRAEntry 11 }
  isisIPRAFullMetric OBJECT-TYPE
      SYNTAX IsisFullMetric
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The wide metric value for reaching the specified
           destination over this circuit.  This object follows the
           ManualOrAutomatic behavior."
      DEFVAL { 10 }
  ::= { isisIPRAEntry 12 }
  isisIPRASNPAAddress OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS read-create
      STATUS current
      DESCRIPTION
          "The SNPA Address to which a PDU may be forwarded in
           order to reach a destination that matches this IP
           Reachable Address.  This object follows the
           ManualOrAutomatic behavior."
      DEFVAL { ''H }
  ::= { isisIPRAEntry 13 }

Parker Standards Track [Page 66] RFC 4444 IS-IS MIB April 2006

  isisIPRASourceType OBJECT-TYPE
      SYNTAX INTEGER
          {
              static (1),
              direct (2),
              ospfv2 (3),
              ospfv3 (4),
              isis   (5),
              rip    (6),
              igrp   (7),
              eigrp  (8),
              bgp    (9),
              other (10)
          }
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The origin of this route."
  ::= { isisIPRAEntry 14 }

– The LSP Database Table – – The first table provides Summary Information about LSPs – The next table provides a complete record

  isisLSPSummaryTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisLSPSummaryEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The table of LSP Headers."
  ::= { isisLSPDataBase 1 }
  isisLSPSummaryEntry OBJECT-TYPE
      SYNTAX IsisLSPSummaryEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry provides a summary describing an
           LSP currently stored in the system.
           Dynamically learned rows will not survive an
           agent reboot."
      INDEX {  isisLSPLevel,
               isisLSPID }
  ::= { isisLSPSummaryTable 1 }
  IsisLSPSummaryEntry ::=

Parker Standards Track [Page 67] RFC 4444 IS-IS MIB April 2006

      SEQUENCE {
          isisLSPLevel
              IsisISLevel,
          isisLSPID
              IsisLinkStatePDUID,
          isisLSPSeq
              Unsigned32,
          isisLSPZeroLife
              TruthValue,
          isisLSPChecksum
              IsisUnsigned16TC,
          isisLSPLifetimeRemain
              IsisUnsigned16TC,
          isisLSPPDULength
              IsisUnsigned16TC,
          isisLSPAttributes
              IsisUnsigned8TC
      }
  isisLSPLevel OBJECT-TYPE
      SYNTAX IsisISLevel
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "At which level does this LSP appear?"
  ::= { isisLSPSummaryEntry 1 }
  isisLSPID OBJECT-TYPE
      SYNTAX IsisLinkStatePDUID
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The 8-byte LSP ID for this Link State PDU."
  ::= { isisLSPSummaryEntry 2 }
  isisLSPSeq OBJECT-TYPE
      SYNTAX Unsigned32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The sequence number for this LSP."
  ::= { isisLSPSummaryEntry 3 }
  isisLSPZeroLife OBJECT-TYPE
      SYNTAX TruthValue
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION

Parker Standards Track [Page 68] RFC 4444 IS-IS MIB April 2006

          "Is this LSP being purged by this system?"
  ::= { isisLSPSummaryEntry 4 }
  isisLSPChecksum OBJECT-TYPE
      SYNTAX IsisUnsigned16TC
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The 16-bit Fletcher Checksum for this LSP."
  ::= { isisLSPSummaryEntry 5 }
  isisLSPLifetimeRemain OBJECT-TYPE
      SYNTAX IsisUnsigned16TC
      UNITS "seconds"
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The remaining lifetime, in seconds, for this LSP."
  ::= { isisLSPSummaryEntry 6 }
  isisLSPPDULength OBJECT-TYPE
      SYNTAX IsisUnsigned16TC
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The length of this LSP."
  ::= { isisLSPSummaryEntry 7 }
  isisLSPAttributes OBJECT-TYPE
      SYNTAX IsisUnsigned8TC
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "Flags carried by the LSP."
  ::= { isisLSPSummaryEntry 8 }

– LSP Table – – The full LSP as a sequence of {Type, Len, Value} tuples – Since the underlying LSP may have changed while downloading – TLVs, we provide the Sequence number and Checksum for each – LSP TLV, so the network manager may verify that they are – still working on the same version of the LSP.

  isisLSPTLVTable OBJECT-TYPE
      SYNTAX SEQUENCE OF IsisLSPTLVEntry
      MAX-ACCESS not-accessible
      STATUS current

Parker Standards Track [Page 69] RFC 4444 IS-IS MIB April 2006

      DESCRIPTION
          "The table of LSPs in the database."
  ::= { isisLSPDataBase 2 }
  isisLSPTLVEntry OBJECT-TYPE
      SYNTAX IsisLSPTLVEntry
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "Each entry describes a TLV within
           an LSP currently stored in the system.
           Dynamically learned rows will not survive an
           agent reboot."
      INDEX {  isisLSPLevel,
               isisLSPID,
               isisLSPTLVIndex }
  ::= { isisLSPTLVTable 1 }
  IsisLSPTLVEntry ::=
      SEQUENCE {
          isisLSPTLVIndex
              Unsigned32,
          isisLSPTLVSeq
              Unsigned32,
          isisLSPTLVChecksum
              IsisUnsigned16TC,
          isisLSPTLVType
              IsisUnsigned8TC,
          isisLSPTLVLen
              IsisUnsigned8TC,
          isisLSPTLVValue
              OCTET STRING
      }
  isisLSPTLVIndex OBJECT-TYPE
      SYNTAX Unsigned32(1..4294967295)
      MAX-ACCESS not-accessible
      STATUS current
      DESCRIPTION
          "The index of this TLV in the LSP.  The first TLV has
           index 1, and the Nth TLV has an index of N."
  ::= { isisLSPTLVEntry 1 }
  isisLSPTLVSeq OBJECT-TYPE
      SYNTAX Unsigned32
      MAX-ACCESS read-only
      STATUS current

Parker Standards Track [Page 70] RFC 4444 IS-IS MIB April 2006

      DESCRIPTION
          "The sequence number for this LSP."
  ::= { isisLSPTLVEntry 2 }
  isisLSPTLVChecksum OBJECT-TYPE
      SYNTAX IsisUnsigned16TC
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The 16-bit Fletcher Checksum for this LSP."
  ::= { isisLSPTLVEntry 3 }
  isisLSPTLVType OBJECT-TYPE
      SYNTAX IsisUnsigned8TC
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The type of this TLV."
  ::= { isisLSPTLVEntry 4 }
  isisLSPTLVLen OBJECT-TYPE
      SYNTAX IsisUnsigned8TC
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The length of this TLV."
  ::= { isisLSPTLVEntry 5 }
  isisLSPTLVValue OBJECT-TYPE
      SYNTAX OCTET STRING (SIZE(0..255))
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
          "The value of this TLV."
  ::= { isisLSPTLVEntry 6 }

– The IS-IS Notification Table

– The IS-IS Notification Table records fields that are – required for notifications

  isisNotificationEntry OBJECT IDENTIFIER
      ::= { isisNotification 1 }
  isisNotificationSysLevelIndex OBJECT-TYPE
      SYNTAX IsisLevel
      MAX-ACCESS accessible-for-notify

Parker Standards Track [Page 71] RFC 4444 IS-IS MIB April 2006

      STATUS current
      DESCRIPTION
          "The system level for this notification."
  ::= { isisNotificationEntry 1 }
  isisNotificationCircIfIndex OBJECT-TYPE
      SYNTAX Unsigned32 (1..2147483647)
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "The identifier of this circuit relevant to
           this notification."
  ::= { isisNotificationEntry 2 }
  isisPduLspId OBJECT-TYPE
      SYNTAX IsisLinkStatePDUID
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "An Octet String that uniquely identifies
           a Link State PDU."
  ::= { isisNotificationEntry 3 }
  isisPduFragment OBJECT-TYPE
      SYNTAX IsisPDUHeader
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "Holds up to 64 initial bytes of a PDU that
           triggered the notification."
  ::= { isisNotificationEntry 4 }
  isisPduFieldLen OBJECT-TYPE
      SYNTAX IsisUnsigned8TC
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "Holds the System ID length reported in PDU we received."
  ::= { isisNotificationEntry 5 }
  isisPduMaxAreaAddress OBJECT-TYPE
      SYNTAX IsisUnsigned8TC
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "Holds the Max Area Addresses reported in a PDU
           we received."
  ::= { isisNotificationEntry 6 }

Parker Standards Track [Page 72] RFC 4444 IS-IS MIB April 2006

  isisPduProtocolVersion OBJECT-TYPE
      SYNTAX IsisUnsigned8TC
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "Holds the Protocol version reported in PDU we received."
  ::= { isisNotificationEntry 7 }
  isisPduLspSize OBJECT-TYPE
      SYNTAX Unsigned32 (0..2147483647)
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "Holds the size of LSP we received that is too
           big to forward."
  ::= { isisNotificationEntry 8 }
  isisPduOriginatingBufferSize OBJECT-TYPE
      SYNTAX IsisUnsigned16TC (0..16000)
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "Holds the size of isisSysLevelOrigLSPBuffSize advertised
           by the peer in the originatingLSPBufferSize TLV.
           If the peer does not advertise this TLV, this
           value is set to 0."
  ::= { isisNotificationEntry 9 }
  isisPduBufferSize OBJECT-TYPE
      SYNTAX IsisUnsigned16TC (0..16000)
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "Holds the size of LSP received from peer."
  ::= { isisNotificationEntry 10 }
  isisPduProtocolsSupported OBJECT-TYPE
      SYNTAX OCTET STRING (SIZE(0..255))
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "The list of protocols supported by an
           adjacent system.  This may be empty."
  ::= { isisNotificationEntry 11 }
  isisAdjState OBJECT-TYPE
      SYNTAX INTEGER
          {

Parker Standards Track [Page 73] RFC 4444 IS-IS MIB April 2006

               down (1),
               initializing (2),
               up (3),
               failed(4)
          }
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "The current state of an adjacency."
  ::= { isisNotificationEntry 12 }
  isisErrorOffset OBJECT-TYPE
      SYNTAX Unsigned32
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "An offset to a problem in a PDU.  If the problem
           is a malformed TLV, this points to the beginning
           of the TLV.  If the problem is in the header, this
           points to the byte that is suspicious."
  ::= { isisNotificationEntry 13 }
  isisErrorTLVType OBJECT-TYPE
      SYNTAX Unsigned32 (0..255)
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
           "The type for a malformed TLV."
  ::= { isisNotificationEntry 14 }
  isisNotificationAreaAddress OBJECT-TYPE
      SYNTAX IsisOSINSAddress
      MAX-ACCESS accessible-for-notify
      STATUS current
      DESCRIPTION
          "An Area Address."
  ::= { isisNotificationEntry 15 }

– Notification definitions – – Note that notifications can be disabled by setting – isisSysNotificationEnable false

  isisDatabaseOverload NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisSysLevelState
      }

Parker Standards Track [Page 74] RFC 4444 IS-IS MIB April 2006

      STATUS current
      DESCRIPTION
          "This notification is generated when the system
           enters or leaves the Overload state.  The number
           of times this has been generated and cleared is kept
           track of by isisSysStatLSPDbaseOloads."
  ::= { isisNotifications 1 }
  isisManualAddressDrops NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationAreaAddress
      }
      STATUS current
      DESCRIPTION
          "This notification is generated when one of the
           manual areaAddresses assigned to this system is
           ignored when computing routes.  The object
           isisNotificationAreaAddress describes the area that
           has been dropped.
           The number of times this event has been generated
           is counted by isisSysStatManAddrDropFromAreas.
           The agent must throttle the generation of
           consecutive isisManualAddressDrops notifications
           so that there is at least a 5-second gap between
           notifications of this type.  When notifications
           are throttled, they are dropped, not queued for
           sending at a future time."
  ::= { isisNotifications 2 }
  isisCorruptedLSPDetected NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisPduLspId
      }
      STATUS current
      DESCRIPTION
          "This notification is generated when we find that
           an LSP that was stored in memory has become
           corrupted.  The number of times this has been
           generated is counted by isisSysCorrLSPs.
           We forward an LSP ID.  We may have independent
           knowledge of the ID, but in some implementations
           there is a chance that the ID itself will be
           corrupted."

Parker Standards Track [Page 75] RFC 4444 IS-IS MIB April 2006

  ::= { isisNotifications 3 }
  isisAttemptToExceedMaxSequence NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisPduLspId
      }
      STATUS current
      DESCRIPTION
          "When the sequence number on an LSP we generate
           wraps the 32-bit sequence counter, we purge and
           wait to re-announce this information.  This
           notification describes that event.  Since these
           should not be generated rapidly, we generate
           an event each time this happens.
           While the first 6 bytes of the LSPID are ours,
           the other two contain useful information."
  ::= { isisNotifications 4 }
  isisIDLenMismatch  NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisPduFieldLen,
          isisNotificationCircIfIndex,
          isisPduFragment
      }
      STATUS current
      DESCRIPTION
          "A notification sent when we receive a PDU
           with a different value for the System ID Length.
           This notification includes an index to identify
           the circuit where we saw the PDU and the header of
           the PDU, which may help a network manager identify
           the source of the confusion.
           The agent must throttle the generation of
           consecutive isisIDLenMismatch notifications
           so that there is at least a 5-second gap between
           notifications of this type.  When notifications
           are throttled, they are dropped, not queued for
           sending at a future time."
  ::= { isisNotifications 5 }
  isisMaxAreaAddressesMismatch NOTIFICATION-TYPE
      OBJECTS {

Parker Standards Track [Page 76] RFC 4444 IS-IS MIB April 2006

          isisNotificationSysLevelIndex,
          isisPduMaxAreaAddress,
          isisNotificationCircIfIndex,
          isisPduFragment
      }
      STATUS current
      DESCRIPTION
          "A notification sent when we receive a PDU
           with a different value for the Maximum Area
           Addresses.  This notification includes the
           header of the packet, which may help a
           network manager identify the source of the
           confusion.
           The agent must throttle the generation of
           consecutive isisMaxAreaAddressesMismatch
           notifications so that there is at least a 5-second
           gap between notifications of this type.  When
           notifications are throttled, they are dropped, not
           queued for sending at a future time."
  ::= { isisNotifications 6 }
  isisOwnLSPPurge NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduLspId
      }
      STATUS current
      DESCRIPTION
          "A notification sent when we receive a PDU
           with our systemID and zero age.  This
           notification includes the circuit Index
           and router ID from the LSP, if available,
           which may help a network manager
           identify the source of the confusion."
  ::= { isisNotifications 7 }
  isisSequenceNumberSkip NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduLspId
      }
      STATUS current

Parker Standards Track [Page 77] RFC 4444 IS-IS MIB April 2006

      DESCRIPTION
          "When we receive an LSP with our System ID
           and different contents, we may need to reissue
           the LSP with a higher sequence number.
           We send this notification if we need to increase
           the sequence number by more than one.  If two
           Intermediate Systems are configured with the same
           System ID, this notification will fire."
  ::= { isisNotifications 8 }
  isisAuthenticationTypeFailure NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduFragment
      }
      STATUS current
      DESCRIPTION
          "A notification sent when we receive a PDU
           with the wrong authentication type field.
           This notification includes the header of the
           packet, which may help a network manager
           identify the source of the confusion.
           The agent must throttle the generation of
           consecutive isisAuthenticationTypeFailure
           notifications so that there is at least a 5-second
           gap between notifications of this type.  When
           notifications are throttled, they are dropped, not
           queued for sending at a future time."
  ::= { isisNotifications 9 }
  isisAuthenticationFailure NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduFragment
      }
      STATUS current
      DESCRIPTION
          "A notification sent when we receive a PDU
           with an incorrect authentication information
           field.  This notification includes the header
           of the packet, which may help a network manager
           identify the source of the confusion.

Parker Standards Track [Page 78] RFC 4444 IS-IS MIB April 2006

           The agent must throttle the generation of
           consecutive isisAuthenticationFailure
           notifications so that there is at least a 5-second
           gap between notifications of this type.  When
           notifications are throttled, they are dropped, not
           queued for sending at a future time."
  ::= { isisNotifications 10 }
  isisVersionSkew NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduProtocolVersion,
          isisPduFragment
      }
      STATUS current
      DESCRIPTION
          "A notification sent when we receive a Hello
           PDU from an IS running a different version
           of the protocol.  This notification includes
           the header of the packet, which may help a
           network manager identify the source of the
           confusion.
           The agent must throttle the generation of
           consecutive isisVersionSkew notifications
           so that there is at least a 5-second gap
           between notifications of this type.  When
           notifications are throttled, they are dropped, not
           queued for sending at a future time."
  ::= { isisNotifications 11 }
  isisAreaMismatch NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationCircIfIndex,
          isisPduFragment
      }
      STATUS current
      DESCRIPTION
          "A notification sent when we receive a Hello
           PDU from an IS that does not share any
           area address.  This notification includes
           the header of the packet, which may help a
           network manager identify the source of the
           confusion.

Parker Standards Track [Page 79] RFC 4444 IS-IS MIB April 2006

           The agent must throttle the generation of
           consecutive isisAreaMismatch notifications
           so that there is at least a 5-second gap
           between notifications of this type.  When
           notifications are throttled, they are dropped, not
           queued for sending at a future time."
  ::= { isisNotifications 12 }
  isisRejectedAdjacency NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduFragment
      }
      STATUS current
      DESCRIPTION
          "A notification sent when we receive a Hello
           PDU from an IS but do not establish an
           adjacency for some reason.
           The agent must throttle the generation of
           consecutive isisRejectedAdjacency notifications
           so that there is at least a 5-second gap
           between notifications of this type.  When
           notifications are throttled, they are dropped, not
           queued for sending at a future time."
  ::= { isisNotifications 13 }
  isisLSPTooLargeToPropagate NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduLspSize,
          isisPduLspId
      }
      STATUS current
      DESCRIPTION
          "A notification sent when we attempt to propagate
           an LSP that is larger than the dataLinkBlockSize
           for the circuit.
           The agent must throttle the generation of
           consecutive isisLSPTooLargeToPropagate notifications
           so that there is at least a 5-second gap
           between notifications of this type.  When
           notifications are throttled, they are dropped, not

Parker Standards Track [Page 80] RFC 4444 IS-IS MIB April 2006

           queued for sending at a future time."
  ::= { isisNotifications 14 }
  isisOrigLSPBuffSizeMismatch NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduLspId,
          isisPduOriginatingBufferSize,
          isisPduBufferSize
      }
      STATUS current
      DESCRIPTION
          "A notification sent when a Level 1 LSP or Level
           2 LSP is received that is larger than the local
           value for isisSysLevelOrigLSPBuffSize, or when an
           LSP is received that contains the supported Buffer Size
           option and the value in the PDU option field does
           not match the local value for isisSysLevelOrigLSPBuffSize.
           We pass up the size from the option field and the
           size of the LSP when one of them exceeds our configuration.
           The agent must throttle the generation of
           consecutive isisOrigLSPBuffSizeMismatch notifications
           so that there is at least a 5-second gap
           between notifications of this type.  When
           notifications are throttled, they are dropped, not
           queued for sending at a future time."
  ::= { isisNotifications 15 }
  isisProtocolsSupportedMismatch NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduProtocolsSupported,
          isisPduLspId,
          isisPduFragment
      }
      STATUS current
      DESCRIPTION
          "A notification sent when a non-pseudonode
           segment 0 LSP is received that has no matching
           protocols supported.  This may be because the system
           does not generate the field, or because there are no
           common elements.  The list of protocols supported
           should be included in the notification: it may be

Parker Standards Track [Page 81] RFC 4444 IS-IS MIB April 2006

           empty if the TLV is not supported, or if the
           TLV is empty.
           The agent must throttle the generation of
           consecutive isisProtocolsSupportedMismatch
           notifications so that there is at least a 5-second
           gap between notifications of this type.  When
           notifications are throttled, they are dropped, not
           queued for sending at a future time."
  ::= { isisNotifications 16 }
  isisAdjacencyChange NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduLspId,
          isisAdjState
      }
      STATUS current
      DESCRIPTION
          "A notification sent when an adjacency changes
           state, entering or leaving state up.
           The first 6 bytes of the isisPduLspId are the
           SystemID of the adjacent IS.
           The isisAdjState is the new state of the adjacency."
  ::= { isisNotifications 17 }
  isisLSPErrorDetected NOTIFICATION-TYPE
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisPduLspId,
          isisNotificationCircIfIndex,
          isisPduFragment,
          isisErrorOffset,
          isisErrorTLVType
      }
      STATUS current
      DESCRIPTION
          "This notification is generated when we receive
           an LSP with a parse error.  The isisCircIfIndex
           holds an index of the circuit on which the PDU
           arrived.  The isisPduFragment holds the start of the
           LSP, and the isisErrorOffset points to the problem.
           If the problem is a malformed TLV, isisErrorOffset
           points to the start of the TLV, and isisErrorTLVType

Parker Standards Track [Page 82] RFC 4444 IS-IS MIB April 2006

           holds the value of the type.
           If the problem is with the LSP header, isisErrorOffset
           points to the suspicious byte.
           The number of such LSPs is accumulated in
           isisSysStatLSPErrors."
  ::= { isisNotifications 18 }

– Agent Conformance Definitions – We define the objects a conformant agent must define

isisCompliances OBJECT IDENTIFIER ::= { isisConformance 1 } isisGroups OBJECT IDENTIFIER ::= { isisConformance 2 }

– compliance statements

  isisCompliance MODULE-COMPLIANCE
      STATUS current
      DESCRIPTION
          "The compliance statement for agents that support
           the IS-IS MIB.
           There are a number of INDEX objects that cannot be
           represented in the form of OBJECT clauses in SMIv2,
           but for which there are compliance requirements.
           Those requirements and similar requirements for
           related objects are expressed below, in
           pseudo-OBJECT clause form, in this description:
  1. - OBJECT isisSummAddressType
  2. - SYNTAX InetAddressType { ipv4(1), ipv6(2) }
  3. -
  4. - DESCRIPTION
  5. - The MIB requires support for IPv4 Summary
  6. - Addresses and anticipates the support of
  7. - IPv6 addresses.
  8. -
  9. -
  10. - OBJECT isisRedistributeAddrType
  11. - SYNTAX InetAddressType { ipv4(1), ipv6(2) }
  12. -
  13. - DESCRIPTION
  14. - The MIB requires support for IPv4
  15. - Redistribution Addresses and anticipates
  16. - the support of IPv6 addresses."
  17. -

Parker Standards Track [Page 83] RFC 4444 IS-IS MIB April 2006

  1. -
  2. - OBJECT isisISAdjIPAddrType
  3. - SYNTAX InetAddressType { ipv4(1), ipv6(2) }
  4. -
  5. - DESCRIPTION
  6. - The MIB requires support for IPv4
  7. - Adjacency Addresses and anticipates the
  8. - support of IPv6 addresses.

MODULE – this module

          MANDATORY-GROUPS {
                  isisSystemGroup,
                  isisCircuitGroup,
                  isisISAdjGroup,
                  isisNotificationObjectGroup,
                  isisNotificationGroup
          }
  ::= { isisCompliances 1 }
  1. - List of all groups, mandatory and optional

isisAdvancedCompliance MODULE-COMPLIANCE

      STATUS current
      DESCRIPTION
          "The compliance statement for agents that fully
           support the IS-IS MIB.
           There are a number of INDEX objects that cannot be
           represented in the form of OBJECT clauses in SMIv2,
           but for which there are compliance requirements.
           Those requirements and similar requirements for
           related objects are expressed below, in
           pseudo-OBJECT clause form, in this description:
  1. - OBJECT isisSummAddressType
  2. - SYNTAX InetAddressType { ipv4(1), ipv6(2) }
  3. -
  4. - DESCRIPTION
  5. - The MIB requires support for IPv4 Summary
  6. - Addresses and anticipates the support of
  7. - IPv6 addresses.
  8. -
  9. -
  10. - OBJECT isisRedistributeAddrType
  11. - SYNTAX InetAddressType { ipv4(1), ipv6(2) }
  12. -
  13. - DESCRIPTION
  14. - The MIB requires support for IPv4
  15. - Redistribution Addresses and anticipates
  16. - the support of IPv6 addresses."

Parker Standards Track [Page 84] RFC 4444 IS-IS MIB April 2006

  1. -
  2. -
  3. - OBJECT isisISAdjIPAddrType
  4. - SYNTAX InetAddressType { ipv4(1), ipv6(2) }
  5. -
  6. - DESCRIPTION
  7. - The MIB requires support for IPv4
  8. - Adjacency Addresses and anticipates the
  9. - support of IPv6 addresses.
  10. -
  11. -
  12. - OBJECT isisIPRADestType
  13. - SYNTAX InetAddressType { ipv4(1), ipv6(2) }
  14. -
  15. - DESCRIPTION
  16. - The MIB requires support for IPv4 RA
  17. - Addresses and anticipates the support of
  18. - IPv6 addresses.
  19. -
  20. -
  21. - OBJECT isisIPRANextHopType
  22. - SYNTAX InetAddressType { ipv4(1), ipv6(2) }
  23. -
  24. - DESCRIPTION
  25. - The MIB requires support for IPv4 NextHop
  26. - Addresses and anticipates the support of
  27. - IPv6 addresses.

MODULE – this module

          MANDATORY-GROUPS {
                  isisSystemGroup,
                  isisCircuitGroup,
                  isisISAdjGroup,
                  isisNotificationObjectGroup,
                  isisNotificationGroup,
                  isisISPDUCounterGroup,
                  isisRATableGroup,
                  isisISIPRADestGroup,
                  isisLSPGroup
          }
  ::= { isisCompliances 2 }
  isisReadOnlyCompliance MODULE-COMPLIANCE
     STATUS     current
     DESCRIPTION
             "When this MIB is implemented without support for
              read-create (i.e., in read-only mode), the
              implementation can claim read-only compliance.  Such
              a device can then be monitored but cannot be

Parker Standards Track [Page 85] RFC 4444 IS-IS MIB April 2006

              configured with this MIB."
     MODULE -- this module
          MANDATORY-GROUPS {
                  isisSystemGroup,
                  isisCircuitGroup,
                  isisISAdjGroup
          }
     OBJECT isisSysLevelType
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysID
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysMaxPathSplits
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysMaxLSPGenInt
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysPollESHelloRate
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysWaitTime
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysAdminState
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysL2toL1Leaking
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."

Parker Standards Track [Page 86] RFC 4444 IS-IS MIB April 2006

     OBJECT isisSysMaxAge
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisManAreaAddrExistState
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysLevelOrigLSPBuffSize
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysLevelMinLSPGenInt
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysLevelSetOverload
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysLevelSetOverloadUntil
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysLevelMetricStyle
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysLevelSPFConsiders
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysLevelTEEnabled
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSysReceiveLSPBufferSize
     MIN-ACCESS read-only
     DESCRIPTION

Parker Standards Track [Page 87] RFC 4444 IS-IS MIB April 2006

          "Write access is not required."
     OBJECT isisSummAddrExistState
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSummAddrMetric
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisSummAddrFullMetric
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisRedistributeAddrExistState
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircAdminState
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircExistState
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircType
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircExtDomain
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelType
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircPassiveCircuit

Parker Standards Track [Page 88] RFC 4444 IS-IS MIB April 2006

     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircMeshGroupEnabled
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircMeshGroup
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircSmallHellos
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircExtendedCircID
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircIfIndex
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCirc3WayEnabled
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelMetric
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelWideMetric
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelISPriority
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."

Parker Standards Track [Page 89] RFC 4444 IS-IS MIB April 2006

     OBJECT isisCircLevelHelloMultiplier
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelHelloTimer
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelDRHelloTimer
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelLSPThrottle
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelMinLSPRetransInt
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelCSNPInterval
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
     OBJECT isisCircLevelPartSNPInterval
     MIN-ACCESS read-only
     DESCRIPTION
          "Write access is not required."
  ::= { isisCompliances 3 }

– MIB Grouping

  isisSystemGroup OBJECT-GROUP
      OBJECTS {
          isisSysVersion,
          isisSysLevelType,
          isisSysID,
          isisSysMaxPathSplits,
          isisSysMaxLSPGenInt,
          isisSysPollESHelloRate,
          isisSysWaitTime,

Parker Standards Track [Page 90] RFC 4444 IS-IS MIB April 2006

          isisSysAdminState,
          isisSysL2toL1Leaking,
          isisSysMaxAge,
          isisSysProtSupported,
          isisSysNotificationEnable,
          isisManAreaAddrExistState,
          isisSysLevelOrigLSPBuffSize,
          isisSysLevelMinLSPGenInt,
          isisSysLevelState,
          isisSysLevelSetOverload,
          isisSysLevelSetOverloadUntil,
          isisSysLevelMetricStyle,
          isisSysLevelSPFConsiders,
          isisSysLevelTEEnabled,
          isisSysReceiveLSPBufferSize,
          isisSummAddrExistState,
          isisSummAddrMetric,
          isisAreaAddr,
          isisSummAddrFullMetric,
          isisRedistributeAddrExistState,
          isisRouterHostName,
          isisRouterID,
          isisSysStatCorrLSPs,
          isisSysStatLSPDbaseOloads,
          isisSysStatManAddrDropFromAreas,
          isisSysStatAttmptToExMaxSeqNums,
          isisSysStatSeqNumSkips,
          isisSysStatOwnLSPPurges,
          isisSysStatIDFieldLenMismatches,
          isisSysStatPartChanges,
          isisSysStatSPFRuns,
          isisSysStatAuthTypeFails,
          isisSysStatAuthFails,
          isisSysStatLSPErrors
      }
      STATUS current
      DESCRIPTION
          "The collections of objects used to manage an
           IS-IS router."
  ::= { isisGroups 1 }
  isisCircuitGroup OBJECT-GROUP
      OBJECTS {
          isisNextCircIndex,
          isisCircAdminState,
          isisCircExistState,
          isisCircType,
          isisCircExtDomain,

Parker Standards Track [Page 91] RFC 4444 IS-IS MIB April 2006

          isisCircLevelType,
          isisCircAdjChanges,
          isisCircNumAdj,
          isisCircInitFails,
          isisCircRejAdjs,
          isisCircIDFieldLenMismatches,
          isisCircMaxAreaAddrMismatches,
          isisCircAuthTypeFails,
          isisCircAuthFails,
          isisCircLANDesISChanges,
          isisCircPassiveCircuit,
          isisCircMeshGroupEnabled,
          isisCircMeshGroup,
          isisCircSmallHellos,
          isisCircLastUpTime,
          isisCirc3WayEnabled,
          isisCircExtendedCircID,
          isisCircIfIndex,
          isisCircLevelMetric,
          isisCircLevelWideMetric,
          isisCircLevelISPriority,
          isisCircLevelIDOctet,
          isisCircLevelID,
          isisCircLevelDesIS,
          isisCircLevelHelloMultiplier,
          isisCircLevelHelloTimer,
          isisCircLevelDRHelloTimer,
          isisCircLevelLSPThrottle,
          isisCircLevelMinLSPRetransInt,
          isisCircLevelCSNPInterval,
          isisCircLevelPartSNPInterval
      }
      STATUS current
      DESCRIPTION
          "The collections of objects used to describe an
           IS-IS Circuit."
  ::= { isisGroups 2 }
  isisISAdjGroup OBJECT-GROUP
      OBJECTS {
          isisISAdjState,
          isisISAdj3WayState,
          isisISAdjNeighSNPAAddress,
          isisISAdjNeighSysType,
          isisISAdjNeighSysID,
          isisISAdjNbrExtendedCircID,
          isisISAdjUsage,
          isisISAdjHoldTimer,

Parker Standards Track [Page 92] RFC 4444 IS-IS MIB April 2006

          isisISAdjNeighPriority,
          isisISAdjLastUpTime,
          isisISAdjAreaAddress,
          isisISAdjIPAddrType,
          isisISAdjIPAddrAddress,
          isisISAdjProtSuppProtocol
      }
      STATUS current
      DESCRIPTION
          "The collections of objects used to manage an
           IS-IS Adjacency."
  ::= { isisGroups 3 }
  isisNotificationObjectGroup OBJECT-GROUP
      OBJECTS {
          isisNotificationSysLevelIndex,
          isisNotificationCircIfIndex,
          isisPduLspId,
          isisPduFragment,
          isisPduFieldLen,
          isisPduMaxAreaAddress,
          isisPduProtocolVersion,
          isisPduLspSize,
          isisPduOriginatingBufferSize,
          isisPduBufferSize,
          isisPduProtocolsSupported,
          isisAdjState,
          isisErrorOffset,
          isisErrorTLVType,
          isisNotificationAreaAddress
      }
      STATUS current
      DESCRIPTION
          "The objects used to record notification parameters."
  ::= { isisGroups 4 }
  isisNotificationGroup        NOTIFICATION-GROUP
      NOTIFICATIONS {
          isisDatabaseOverload,
          isisManualAddressDrops,
          isisCorruptedLSPDetected,
          isisAttemptToExceedMaxSequence,
          isisIDLenMismatch,
          isisMaxAreaAddressesMismatch,
          isisOwnLSPPurge,
          isisSequenceNumberSkip,
          isisAuthenticationTypeFailure,

Parker Standards Track [Page 93] RFC 4444 IS-IS MIB April 2006

          isisAuthenticationFailure,
          isisVersionSkew,
          isisAreaMismatch,
          isisRejectedAdjacency,
          isisLSPTooLargeToPropagate,
          isisOrigLSPBuffSizeMismatch,
          isisProtocolsSupportedMismatch,
          isisAdjacencyChange,
          isisLSPErrorDetected
      }
      STATUS current
      DESCRIPTION
          "The collections of notifications sent by an IS."
  ::= { isisGroups 5 }
  isisISPDUCounterGroup OBJECT-GROUP
      OBJECTS {
          isisPacketCountIIHello,
          isisPacketCountISHello,
          isisPacketCountESHello,
          isisPacketCountLSP,
          isisPacketCountCSNP,
          isisPacketCountPSNP,
          isisPacketCountUnknown
      }
      STATUS current
      DESCRIPTION
          "The collections of objects used to count protocol PDUs."
  ::= { isisGroups 6 }
  isisRATableGroup OBJECT-GROUP
      OBJECTS {
          isisRAExistState,
          isisRAAdminState,
          isisRAAddrPrefix,
          isisRAMapType,
          isisRAMetric,
          isisRAMetricType,
          isisRASNPAAddress,
          isisRASNPAMask,
          isisRASNPAPrefix,
          isisRAType
      }
      STATUS current
      DESCRIPTION
          "The collections of objects used to manage the

Parker Standards Track [Page 94] RFC 4444 IS-IS MIB April 2006

           reachable NSAP prefixes."
  ::= { isisGroups 7 }
  isisISIPRADestGroup OBJECT-GROUP
      OBJECTS {
          isisIPRANextHopType,
          isisIPRANextHop,
          isisIPRAType,
          isisIPRAExistState,
          isisIPRAAdminState,
          isisIPRAMetric,
          isisIPRAFullMetric,
          isisIPRAMetricType,
          isisIPRASNPAAddress,
          isisIPRASourceType
      }
      STATUS current
      DESCRIPTION
          "The collections of objects used to manage configured
           IP addresses."
  ::= { isisGroups 8 }
  isisLSPGroup OBJECT-GROUP
      OBJECTS {
          isisLSPSeq,
          isisLSPZeroLife,
          isisLSPChecksum,
          isisLSPLifetimeRemain,
          isisLSPPDULength,
          isisLSPAttributes,
          isisLSPTLVSeq,
          isisLSPTLVChecksum,
          isisLSPTLVType,
          isisLSPTLVLen,
          isisLSPTLVValue
      }
      STATUS current
      DESCRIPTION
          "The collections of objects used to observe the LSP
           Database."
  ::= { isisGroups 9 }

END

Parker Standards Track [Page 95] RFC 4444 IS-IS MIB April 2006

5. IANA Considerations

 The MIB module in this document uses the following IANA-assigned
 OBJECT IDENTIFIER values recorded in the SMI Numbers registry:
    Descriptor        OBJECT IDENTIFIER value
    ----------        -----------------------
    isisMIB           { mib-2 138 }

6. Acknowledgements

 This MIB is based on a March 1994 document by Chris Gunner, who
 should be held blameless for the errors introduced since then.  This
 version has been modified to include MIB-II syntax, to exclude
 portions of the protocol that are not relevant to IP, such as the
 ES-IS protocol, and to add management support for current practice.
 We would like to thank the following individuals for constructive and
 valuable comments: Mike Bartlett, Neal Castagnoli, Ken Chapman, Joan
 Cucchiara, Satish Dattatri, Nagi Jonnala, Adrian Farrel, Shamik
 Ganguly, Les Ginsberg, Don Goodspeed, Jeff Gross, Jim Halpin, Jon
 Harrison, Dimitri Haskin, C. M. Heard, Peter Higginson, Christian
 Hopps, Laura Liu, Gavin McPherson, Kay Noguchi, Serge Maskalik, Z.
 Opalka, Jeff Pickering, Sundar Ramachandran, Swaminatha Ramalingam,
 Aravind Ravikumar, Juergen Schoenwaelder, Koen Vermeulen, Hans De
 Vleeschouwer, Bert Wijnen, and Bingzhang Zhao.

7. Security Considerations

 Management information defined in this MIB may be considered
 sensitive in some network environments.

7.1. Discussion

 This MIB may be used to manage an IP router, which is used to direct
 network traffic.  The control of network traffic allows an attacker
 to deny service to a region of the network or to forward traffic to
 adversaries.  By raising or lowering metrics, traffic may be directed
 to insecure portions of the network.  By disabling the protocol on an
 interface, the network may be partitioned.  Changes to the network
 topology will force all routers to recompute their routes.  Periodic
 route changes have brought down networks in the past by subjecting
 routers to stressful recomputations.
 There are a number of management objects defined in this MIB that
 have a MAX-ACCESS clause of read-write and/or read-create.  Such
 objects may be considered sensitive or vulnerable in some network

Parker Standards Track [Page 96] RFC 4444 IS-IS MIB April 2006

 environments.  The support for SET operations in a non-secure
 environment without proper protection can have a negative effect on
 network operations.  Authentication of received SNMP requests and
 controlled access to management information should be employed in
 such environments.
 We identify a set of threats and then list attributes that can be
 used in each form of attack.  We discuss the effects that can be
 obtained by a single change to the variable in each class.

7.2. Threats

  1. Drop an Adjacency
  2. Drop all Peers
  3. Drop Subnetwork
  4. Split the Network
  5. Intermittent Outages
  6. Redirect Traffic
  7. Delay Convergence
  8. Avoid Detection
  9. Prevent Updates
  10. Hijack LAN
  11. Create Problems for CLNS Networks

7.2.1. Drop an Adjacency

 By changing attributes that are used to peer, we can disrupt an
 adjacency and bring a link down.
    isisCirc3WayEnabled
    isisCircAdminState
    isisCircExistState
    isisCircLevelDRHelloTimer
    isisCircLevelHelloTimer
    isisCircLevelType
    isisCircSmallHellos

7.2.2. Drop All Adjacencies

 These attributes can be used to break some or all of a router's
 adjacencies.  In the case of System ID, the adjacency may be
 restored.  However, it will subject the network to additional stress.
    isisSysLevelType
    isisManAreaAddrExistState
    isisSysAdminState
    isisSysID

Parker Standards Track [Page 97] RFC 4444 IS-IS MIB April 2006

7.2.3. Drop Subnetwork

 This attribute can be used to stop advertisement of a subnetwork
 reachable through a single interface.
    isisCircPassiveCircuit

7.2.4. Split the Network

 If the network design depends upon Wide Metrics or TE, we can use
 these attributes to prevent traffic from passing through a router.
    isisSysLevelMetricStyle
    isisSysLevelOrigLSPBuffSize
    isisSysLevelSPFConsiders
    isisSysLevelTEEnabled
    isisSysReceiveLSPBufferSize

7.2.5. Intermittent Outages

 We can use these attributes to subject the network to a series of
 topology changes, or otherwise force extensive recomputations of
 routes.
    isisSysLevelMinLSPGenInt
    isisSysLevelSetOverload
    isisSysLevelSetOverloadUntil
    isisSysMaxAge
    isisSysMaxLSPGenInt
    isisSysL2toL1Leaking
    isisSysID

7.2.6. Redirect Traffic

 By changing attributes such as metrics, we can push traffic to
 different parts of the network.  This may allow an intruder to
 observe data traffic from otherwise remote parts of the network.
 We may also use these attributes to deny service to parts of the
 network.
    isisSysMaxPathSplits
    isisCircLevelMetric
    isisCircLevelWideMetric
    isisIPRAAdminState
    isisIPRAExistState
    isisIPRAFullMetric
    isisIPRAMetric

Parker Standards Track [Page 98] RFC 4444 IS-IS MIB April 2006

    isisIPRAMetricType
    isisIPRANextHop
    isisIPRANextHopType
    isisIPRASNPAAddress
    isisIPRAType
    isisRedistributeAddrExistState
    isisSummAddrExistState
    isisSummAddrFullMetric
    isisSummAddrMetric
    isisSysL2toL1Leaking

7.2.7. Delay Convergence

 These attributes can be used to slow convergence by increasing the
 minimal interval required to update a packet.
    isisCircLevelCSNPInterval
    isisCircLevelLSPThrottle
    isisCircLevelMinLSPRetransInt
    isisCircLevelPartSNPInterval
    isisSysWaitTime
    isisCircPassiveCircuit

7.2.8. Avoid Detection

 By turning off traps, we can prevent a Network Management station
 from observing problems in the network caused by other aspects of an
 attack.
    isisSysNotificationEnable

7.2.9. Prevent Updates

 Mesh Groups can be used to prevent the transmission of Link State
 PDUs on certain interfaces, delaying or preventing the propagation of
 updates.
    isisCircMeshGroup
    isisCircMeshGroupEnabled

7.2.10. Hijack LAN

 If we have compromised a router, we can use this attribute to become
 the designated router and lie about the topology of a LAN.
    isisCircLevelISPriority

Parker Standards Track [Page 99] RFC 4444 IS-IS MIB April 2006

7.2.11. Create Problems for CLNS Networks

 This attribute can be used to modify the handling of CLNS traffic.
    isisRAAddrPrefix
    isisRAAdminState
    isisRAExistState
    isisRAMapType
    isisRAMetric
    isisRAMetricType
    isisRASNPAAddress
    isisRASNPAMask
    isisRASNPAPrefix
    isisRAType
    isisSysPollESHelloRate

7.2.12. Mostly Harmless

 The following writable attributes do not pose a known security risk.
    isisCircExtDomain
    isisCircExtendedCircID
    isisCircIfIndex
    isisCircLevelHelloMultiplier
    isisCircType

7.2.13. Recommendations

 Much of the MIB is used to set or read attributes which are readily
 visible to any intruder who has access to traffic.  None of the
 security attributes are setable or visible through the MIB.  Read
 access to the MIB does not pose additional risks or vulnerabilities.
 If write access is to be provided, it is RECOMMENDED that
 implementers consider the security features as provided by the SNMPv3
 framework (see [RFC3410], section 8), including full support for the
 SNMPv3 cryptographic mechanisms (for authentication and privacy).
 SNMP versions prior to SNMPv3 did not include adequate security.
 Even if the network itself is secure (for example by using IPSec),
 even then, there is no control as to who on the secure network is
 allowed to access and GET/SET (read/change/create/delete) the objects
 in this MIB module.
 Deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED.
 Instead, it is RECOMMENDED to deploy SNMPv3 and to enable
 cryptographic security.  It is then a customer/operator
 responsibility to ensure that the SNMP entity giving access to an

Parker Standards Track [Page 100] RFC 4444 IS-IS MIB April 2006

 instance of this MIB module is properly configured to give access to
 the objects only to those principals (users) that have legitimate
 rights to indeed GET or SET (change/create/delete) them.

8. Normative References

 [ISO10589] ISO 10589, "Intermediate system to Intermediate system
            routeing information exchange protocol for use in
            conjunction with the Protocol for providing the
            Connectionless-mode Network Service (ISO 8473)," ISO/IEC
            10589:2002.
 [ISO10733] ISO 10733, "Information Processing Systems - Open Systems
            Interconnection - Specification of the elements of
            Management Information related to OSI Network layer
            Standards", September 1998.
 [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
            Requirement Levels", BCP 14, RFC 2119, March 1997.
 [RFC1195]  Callon, R., "Use of OSI IS-IS for routing in TCP/IP and
            dual environments", RFC 1195, December 1990.
 [RFC2863]  McCloghrie, K. and F. Kastenholz, "The Interfaces Group
            MIB", RFC 2863, June 2000.
 [RFC3289]  Baker, F., Chan, K., and A. Smith, "Management Information
            Base for the Differentiated Services Architecture", RFC
            3289, May 2002.
 [RFC3411]  Harrington, D., Presuhn, R., and B. Wijnen, "An
            Architecture for Describing Simple Network Management
            Protocol (SNMP) Management Frameworks", STD 62, RFC 3411,
            December 2002.
 [RFC2578]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
            "Structure of Management Information Version 2 (SMIv2)",
            STD 58, RFC 2578, April 1999.
 [RFC2579]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
            "Textual Conventions for SMIv2", STD 58, RFC 2579, April
            1999.
 [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
            "Conformance Statements for SMIv2", STD 58, RFC 2580,
            April 1999.

Parker Standards Track [Page 101] RFC 4444 IS-IS MIB April 2006

 [RFC4001]  Daniele, M., Haberman, B., Routhier, S., and J.
            Schoenwaelder, "Textual Conventions for Internet Network
            Addresses", RFC 4001, February 2005.

9. Informative References

 [RFC2973]  Balay, R., Katz, D., and J. Parker, "IS-IS Mesh Groups",
            RFC 2973, October 2000.
 [RFC3373]  Katz, D. and R. Saluja, "Three-Way Handshake for
            Intermediate System to Intermediate System (IS-IS) Point-
            to-Point Adjacencies", RFC 3373, September 2002.
 [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
            "Introduction and Applicability Statements for Internet-
            Standard Management Framework", RFC 3410, December 2002.

Authors' Address

 Jeff Parker
 Department of Computer Science
 Middlebury College,
 Middlebury, Vermont 05753
 EMail: jeffp@middlebury.edu

Parker Standards Track [Page 102] RFC 4444 IS-IS MIB April 2006

Full Copyright Statement

 Copyright (C) The Internet Society (2006).
 This document is subject to the rights, licenses and restrictions
 contained in BCP 78, and except as set forth therein, the authors
 retain all their rights.
 This document and the information contained herein are provided on an
 "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
 OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
 ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
 INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
 INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Intellectual Property

 The IETF takes no position regarding the validity or scope of any
 Intellectual Property Rights or other rights that might be claimed to
 pertain to the implementation or use of the technology described in
 this document or the extent to which any license under such rights
 might or might not be available; nor does it represent that it has
 made any independent effort to identify any such rights.  Information
 on the procedures with respect to rights in RFC documents can be
 found in BCP 78 and BCP 79.
 Copies of IPR disclosures made to the IETF Secretariat and any
 assurances of licenses to be made available, or the result of an
 attempt made to obtain a general license or permission for the use of
 such proprietary rights by implementers or users of this
 specification can be obtained from the IETF on-line IPR repository at
 http://www.ietf.org/ipr.
 The IETF invites any interested party to bring to its attention any
 copyrights, patents or patent applications, or other proprietary
 rights that may cover technology that may be required to implement
 this standard.  Please address the information to the IETF at
 ietf-ipr@ietf.org.

Acknowledgement

 Funding for the RFC Editor function is provided by the IETF
 Administrative Support Activity (IASA).

Parker Standards Track [Page 103]

/data/webs/external/dokuwiki/data/pages/rfc/rfc4444.txt · Last modified: 2006/04/17 17:42 (external edit)