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rfc:rfc3473

Network Working Group L. Berger, Editor Request for Comments: 3473 Movaz Networks Category: Standards Track January 2003

   Generalized Multi-Protocol Label Switching (GMPLS) Signaling

Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Extensions

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 (2003).  All Rights Reserved.

Abstract

 This document describes extensions to Multi-Protocol Label Switching
 (MPLS) Resource ReserVation Protocol - Traffic Engineering (RSVP-TE)
 signaling required to support Generalized MPLS.  Generalized MPLS
 extends the MPLS control plane to encompass time-division (e.g.,
 Synchronous Optical Network and Synchronous Digital Hierarchy,
 SONET/SDH), wavelength (optical lambdas) and spatial switching (e.g.,
 incoming port or fiber to outgoing port or fiber).  This document
 presents a RSVP-TE specific description of the extensions.  A generic
 functional description can be found in separate documents.

Table of Contents

 1.  Introduction  ..............................................   2
 2.  Label Related Formats   ....................................   3
  2.1  Generalized Label Request Object  ........................   3
  2.2  Bandwidth Encoding  ......................................   4
  2.3  Generalized Label Object  ................................   5
  2.4  Waveband Switching  ......................................   5
  2.5  Suggested Label  .........................................   6
  2.6  Label Set  ...............................................   7
 3.  Bidirectional LSPs  ........................................   8
  3.1  Procedures  ..............................................   9
  3.2  Contention Resolution  ...................................   9
 4.  Notification  ..............................................   9
  4.1  Acceptable Label Set Object  .............................  10
  4.2  Notify Request Objects  ..................................  10

Berger Standards Track [Page 1] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

  4.3  Notify Message  ..........................................  12
  4.4  Removing State with a PathErr message  ...................  14
 5.  Explicit Label Control  ....................................  15
  5.1  Label ERO subobject  .....................................  15
  5.2  Label RRO subobject  .....................................  16
 6.  Protection Object  .........................................  17
  6.1  Procedures  ..............................................  18
 7.  Administrative Status Information  .........................  18
  7.1  Admin Status Object  .....................................  18
  7.2  Path and Resv Message Procedures  ........................  18
  7.3  Notify Message Procedures  ...............................  20
 8.  Control Channel Separation  ................................  21
  8.1  Interface Identification  ................................  21
  8.2  Errored Interface Identification  ........................  23
 9.  Fault Handling  ............................................  25
  9.1  Restart_Cap Object  ......................................  25
  9.2  Processing of Restart_Cap Object  ........................  26
  9.3  Modification to Hello Processing to Support
       State Recovery  ..........................................  26
  9.4  Control Channel Faults  ..................................  27
  9.5  Nodal Faults  ............................................  27
 10. RSVP Message Formats and Handling  .........................  30
  10.1  RSVP Message Formats  ...................................  30
  10.2  Addressing Path and PathTear Messages   .................  32
 11. Acknowledgments  ...........................................  32
 12. Security Considerations  ...................................  33
 13. IANA Considerations  .......................................  34
  13.1  IANA Assignments  .......................................  35
 14. Intellectual Property Considerations  ......................  36
 15. References  ................................................  37
  15.1  Normative References  ...................................  37
  15.2  Informative References  .................................  38
 16. Contributors  ..............................................  38
 17. Editor's Address  ..........................................  41
 18. Full Copyright Statement  ..................................  42

1. Introduction

 Generalized MPLS extends MPLS from supporting packet (PSC) interfaces
 and switching to include support of three new classes of interfaces
 and switching: Time-Division Multiplex (TDM), Lambda Switch (LSC) and
 Fiber-Switch (FSC).  A functional description of the extensions to
 MPLS signaling needed to support the new classes of interfaces and
 switching is provided in [RFC3471].  This document presents RSVP-TE
 specific formats and mechanisms needed to support all four classes of
 interfaces.

Berger Standards Track [Page 2] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 [RFC3471] should be viewed as a companion document to this document.
 The format of this document parallels [RFC3471].  In addition to the
 other features of Generalized MPLS, this document also defines RSVP-
 TE specific features to support rapid failure notification, see
 Sections 4.2 and 4.3.
 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
 document are to be interpreted as described in [RFC2119].

2. Label Related Formats

 This section defines formats for a generalized label request, a
 generalized label, support for waveband switching, suggested label
 and label sets.

2.1. Generalized Label Request Object

 A Path message SHOULD contain as specific an LSP (Label Switched
 Path) Encoding Type as possible to allow the maximum flexibility in
 switching by transit LSRs.  A Generalized Label Request object is set
 by the ingress node, transparently passed by transit nodes, and used
 by the egress node.  The Switching Type field may also be updated
 hop-by-hop.
 The format of a Generalized Label Request object is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (19)|  C-Type (4)   |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 | LSP Enc. Type |Switching Type |             G-PID             |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 See [RFC3471] for a description of parameters.

2.1.1. Procedures

 A node processing a Path message containing a Generalized Label
 Request must verify that the requested parameters can be satisfied by
 the interface on which the incoming label is to be allocated, the
 node itself, and by the interface on which the traffic will be
 transmitted.  The node may either directly support the LSP or it may
 use a tunnel (FA), i.e., another class of switching.  In either case,
 each parameter must be checked.

Berger Standards Track [Page 3] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 Note that local node policy dictates when tunnels may be used and
 when they may be created.  Local policy may allow for tunnels to be
 dynamically established or may be solely administratively controlled.
 For more information on tunnels and processing of ER hops when using
 tunnels see [MPLS-HIERARCHY].
 Transit and egress nodes MUST verify that the node itself and, where
 appropriate, that the interface or tunnel on which the traffic will
 be transmitted can support the requested LSP Encoding Type.  If
 encoding cannot be supported, the node MUST generate a PathErr
 message, with a "Routing problem/Unsupported Encoding" indication.
 Nodes MUST verify that the type indicated in the Switching Type
 parameter is supported on the corresponding incoming interface.  If
 the type cannot be supported, the node MUST generate a PathErr
 message with a "Routing problem/Switching Type" indication.
 The G-PID parameter is normally only examined at the egress.  If the
 indicated G-PID cannot be supported then the egress MUST generate a
 PathErr message, with a "Routing problem/Unsupported L3PID"
 indication.  In the case of PSC and when penultimate hop popping
 (PHP) is requested, the penultimate hop also examines the (stored)
 G-PID during the processing of the Resv message.  In this case if the
 G-PID is not supported, then the penultimate hop MUST generate a
 ResvErr message with a "Routing problem/Unacceptable label value"
 indication.  The generated ResvErr message MAY include an Acceptable
 Label Set, see Section 4.1.
 When an error message is not generated, normal processing occurs.  In
 the transit case this will typically result in a Path message being
 propagated.  In the egress case and PHP special case this will
 typically result in a Resv message being generated.

2.2. Bandwidth Encoding

 Bandwidth encodings are carried in the SENDER_TSPEC and FLOWSPEC
 objects.  See [RFC3471] for a definition of values to be used for
 specific signal types.  These values are set in the Peak Data Rate
 field of Int-Serv objects, see [RFC2210].  Other bandwidth/service
 related parameters in the object are ignored and carried
 transparently.

Berger Standards Track [Page 4] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

2.3. Generalized Label Object

 The format of a Generalized Label object is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (16)|   C-Type (2)  |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                             Label                             |
 |                              ...                              |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 See [RFC3471] for a description of parameters and encoding of labels.

2.3.1. Procedures

 The Generalized Label travels in the upstream direction in Resv
 messages.
 The presence of both a generalized and normal label object in a Resv
 message is a protocol error and should treated as a malformed message
 by the recipient.
 The recipient of a Resv message containing a Generalized Label
 verifies that the values passed are acceptable.  If the label is
 unacceptable then the recipient MUST generate a ResvErr message with
 a "Routing problem/MPLS label allocation failure" indication.

2.4. Waveband Switching Object

 Waveband switching uses the same format as the generalized label, see
 section 2.2.  Waveband Label uses C-Type (3),
 In the context of waveband switching, the generalized label has the
 following format:

Berger Standards Track [Page 5] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (16)|   C-Type (3)  |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                          Waveband Id                          |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                          Start Label                          |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                           End Label                           |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 See [RFC3471] for a description of parameters.

2.4.1. Procedures

 The procedures defined in Section 2.3.1 apply to waveband switching.
 This includes generating a ResvErr message with a "Routing
 problem/MPLS label allocation failure" indication if any of the label
 fields are unrecognized or unacceptable.
 Additionally, when a waveband is switched to another waveband, it is
 possible that the wavelengths within the waveband will be mirrored
 about a center frequency.  When this type of switching is employed,
 the start and end label in the waveband label object MUST be flipped
 before forwarding the label object with the new waveband Id.  In this
 manner an egress/ingress LSR which receives a waveband label which
 has these values inverted, knows that it must also invert its egress
 association to pick up the proper wavelengths.
 This operation MUST be performed in both directions when a
 bidirectional waveband tunnel is being established.

2.5. Suggested Label Object

 The format of a Suggested_Label object is identical to a generalized
 label.  It is used in Path messages.  A Suggested_Label object uses
 Class-Number 129 (of form 10bbbbbb) and the C-Type of the label being
 suggested.
 Errors in received Suggested_Label objects MUST be ignored.  This
 includes any received inconsistent or unacceptable values.
 Per [RFC3471], if a downstream node passes a label value that differs
 from the suggested label upstream, the upstream LSR MUST either
 reconfigure itself so that it uses the label specified by the
 downstream node or generate a ResvErr message with a "Routing

Berger Standards Track [Page 6] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 problem/Unacceptable label value" indication.  Furthermore, an
 ingress node SHOULD NOT transmit data traffic using a suggested label
 until the downstream node passes a corresponding label upstream.

2.6. Label Set Object

 The Label_Set object uses Class-Number 36 (of form 0bbbbbbb) and the
 C-Type of 1.  It is used in Path messages.
 The format of a Label_Set is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (36)|   C-Type (1)  |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |    Action     |      Reserved     |        Label Type         |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                          Subchannel 1                         |
 |                              ...                              |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 :                               :                               :
 :                               :                               :
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                          Subchannel N                         |
 |                              ...                              |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 Label Type: 14 bits
    Indicates the type and format of the labels carried in the object.
    Values match the C-Type of the appropriate RSVP_LABEL object.
    Only the low order 8 bits are used in this field.
 See [RFC3471] for a description of other parameters.

2.6.1. Procedures

 A Label Set is defined via one or more Label_Set objects.  Specific
 labels/subchannels can be added to or excluded from a Label Set via
 Action zero (0) and one (1) objects respectively.  Ranges of
 labels/subchannels can be added to or excluded from a Label Set via
 Action two (2) and three (3) objects respectively.  When the
 Label_Set objects only list labels/subchannels to exclude, this
 implies that all other labels are acceptable.

Berger Standards Track [Page 7] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 The absence of any Label_Set objects implies that all labels are
 acceptable.  A Label Set is included when a node wishes to restrict
 the label(s) that may be used downstream.
 On reception of a Path message, the receiving node will restrict its
 choice of labels to one which is in the Label Set.  Nodes capable of
 performing label conversion may also remove the Label Set prior to
 forwarding the Path message.  If the node is unable to pick a label
 from the Label Set or if there is a problem parsing the Label_Set
 objects, then the request is terminated and a PathErr message with a
 "Routing problem/Label Set" indication MUST be generated.  It is a
 local matter if the Label Set is stored for later selection on the
 Resv or if the selection is made immediately for propagation in the
 Resv.
 On reception of a Path message, the Label Set represented in the
 message is compared against the set of available labels at the
 downstream interface and the resulting intersecting Label Set is
 forwarded in a Path message.  When the resulting Label Set is empty,
 the Path must be terminated, and a PathErr message, and a "Routing
 problem/Label Set" indication MUST be generated.  Note that
 intersection is based on the physical labels (actual wavelength/band
 values) which may have different logical values on different links,
 as a result it is the responsibility of the node to map these values
 so that they have a consistent physical meaning, or to drop the
 particular values from the set if no suitable logical label value
 exists.
 When processing a Resv message at an intermediate node, the label
 propagated upstream MUST fall within the Label Set.
 Note, on reception of a Resv message a node that is incapable of
 performing label conversion has no other choice than to use the same
 physical label (wavelength/band) as received in the Resv message.  In
 this case, the use and propagation of a Label Set will significantly
 reduce the chances that this allocation will fail.

3. Bidirectional LSPs

 Bidirectional LSP setup is indicated by the presence of an Upstream
 Label in the Path message.  An Upstream_Label object has the same
 format as the generalized label, see Section 2.3.  The Upstream_Label
 object uses Class-Number 35 (of form 0bbbbbbb) and the C-Type of the
 label being used.

Berger Standards Track [Page 8] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

3.1. Procedures

 The process of establishing a bidirectional LSP follows the
 establishment of a unidirectional LSP with some additions.  To
 support bidirectional LSPs an Upstream_Label object is added to the
 Path message.  The Upstream_Label object MUST indicate a label that
 is valid for forwarding at the time the Path message is sent.
 When a Path message containing an Upstream_Label object is received,
 the receiver first verifies that the upstream label is acceptable.
 If the label is not acceptable, the receiver MUST issue a PathErr
 message with a "Routing problem/Unacceptable label value" indication.
 The generated PathErr message MAY include an Acceptable Label Set,
 see Section 4.1.
 An intermediate node must also allocate a label on the outgoing
 interface and establish internal data paths before filling in an
 outgoing upstream label and propagating the Path message.  If an
 intermediate node is unable to allocate a label or internal
 resources, then it MUST issue a PathErr message with a "Routing
 problem/MPLS label allocation failure" indication.
 Terminator nodes process Path messages as usual, with the exception
 that the upstream label can immediately be used to transport data
 traffic associated with the LSP upstream towards the initiator.
 When a bidirectional LSP is removed, both upstream and downstream
 labels are invalidated and it is no longer valid to send data using
 the associated labels.

3.2. Contention Resolution

 There are two additional contention resolution related considerations
 when controlling bidirectional LSP setup via RSVP-TE.  The first is
 that for the purposes of RSVP contention resolution, the node ID is
 the IP address used in the RSVP_HOP object.  The second is that a
 neighbor's node ID might not be known when sending an initial Path
 message.  When this case occurs, a node should suggest a label chosen
 at random from the available label space.

4. Notification

 This section covers several notification related extensions.  The
 first extension defines the Acceptable Label Set object to support
 Notification on Label Error, per [RFC3471].  The second and third
 extensions enable expedited notification of failures and other events
 to nodes responsible for restoring failed LSPs.  (The second
 extension, the Notify Request object, identifies where event

Berger Standards Track [Page 9] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 notifications are to be sent.  The third extension, the Notify
 message, provides for general event notification.)  The final
 notification related extension allows for the removal of Path state
 on handling of PathErr messages.

4.1. Acceptable Label Set Object

 Acceptable_Label_Set objects use a Class-Number 130 (of form
 10bbbbbb).  The remaining contents of the object, including C-Type,
 have the identical format as the Label_Set object, see Section 2.6.
 Acceptable_Label_Set objects may be carried in PathErr and ResvErr
 messages.  The procedures for defining an Acceptable Label Set follow
 the procedures for defining a Label Set, see Section 2.6.1.
 Specifically, an Acceptable Label Set is defined via one or more
 Acceptable_Label_Set objects.  Specific labels/subchannels can be
 added to or excluded from an Acceptable Label Set via  Action zero
 (0) and one (1) objects respectively.  Ranges of labels/subchannels
 can be added to or excluded from an Acceptable Label Set via Action
 two (2) and three (3) objects respectively.  When the
 Acceptable_Label_Set objects only list labels/subchannels to exclude,
 this implies that all other labels are acceptable.
 The inclusion of Acceptable_Label_Set objects is optional.  If
 included, the PathErr or ResvErr message SHOULD contain a "Routing
 problem/Unacceptable label value" indication.  The absence of
 Acceptable_Label_Set objects does not have any specific meaning.

4.2. Notify Request Objects

 Notifications may be sent via the Notify message defined below.  The
 Notify Request object is used to request the generation of
 notifications.  Notifications, i.e., the sending of a Notify message,
 may be requested in both the upstream and downstream directions.

4.2.1. Required Information

 The Notify Request Object may be carried in Path or Resv Messages,
 see Section 7.  The Notify_Request Class-Number is 195 (of form
 11bbbbbb).  The format of a Notify Request is:
    o  IPv4 Notify Request Object

Berger Standards Track [Page 10] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (1) |  C-Type (1)   |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                    IPv4 Notify Node Address                   |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 IPv4 Notify Node Address: 32 bits
    The IP address of the node that should be notified when generating
    an error message.
    o  IPv6 Notify Request Object
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (2) |  C-Type (2)   |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                                                               |
 |                    IPv6 Notify Node Address                   |
 |                                                               |
 |                                                               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 IPv6 Notify Node Address: 16 bytes
    The IP address of the node that should be notified when generating
    an error message.
 If a message contains multiple Notify_Request objects, only the first
 object is meaningful.  Subsequent Notify_Request objects MAY be
 ignored and SHOULD NOT be propagated.

4.2.2. Procedures

 A Notify Request object may be inserted in Path or Resv messages to
 indicate the address of a node that should be notified of an LSP
 failure.  As previously mentioned, notifications may be requested in
 both the upstream and downstream directions.  Upstream notification
 is indicated via the inclusion of a Notify Request Object in the
 corresponding Path message.  Downstream notification is indicated via
 the inclusion of a Notify Request Object in the corresponding Resv
 message.

Berger Standards Track [Page 11] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 A node receiving a message containing a Notify Request object SHOULD
 store the Notify Node Address in the corresponding state block.  If
 the node is a transit node, it SHOULD also included a Notify Request
 object in the outgoing Path or Resv message.  The outgoing Notify
 Node Address MAY be updated based on local policy.
 Note that the inclusion of a Notify Request object does not guarantee
 that a Notify message will be generated.

4.3. Notify Message

 The Notify message provides a mechanism to inform non-adjacent nodes
 of LSP related events.  Notify messages are normally generated only
 after a Notify Request object has been received.  The Notify message
 differs from the currently defined error messages (i.e., PathErr and
 ResvErr messages) in that it can be "targeted" to a node other than
 the immediate upstream or downstream neighbor and that it is a
 generalized notification mechanism.  The Notify message does not
 replace existing error messages.  The Notify message may be sent
 either (a) normally, where non-target nodes just forward the Notify
 message to the target node, similar to ResvConf processing in
 [RFC2205]; or (b) encapsulated in a new IP header whose destination
 is equal to the target IP address.  Regardless of the transmission
 mechanism, nodes receiving a Notify message not destined to the node
 forward the message, unmodified, towards the target.
 To support reliable delivery of the Notify message, an Ack Message
 [RFC2961] is used to acknowledge the receipt of a Notify Message.
 See [RFC2961] for details on reliable RSVP message delivery.

4.3.1. Required Information

 The Notify message is a generalized notification message.  The IP
 destination address is set to the IP address of the intended
 receiver.  The Notify message is sent without the router alert
 option.  A single Notify message may contain notifications being
 sent, with respect to each listed session, both upstream and
 downstream.
 The Notify message has a Message Type of 21.  The Notify message
 format is as follows:
 <Notify message>            ::= <Common Header> [<INTEGRITY>]
                      [ [<MESSAGE_ID_ACK> | <MESSAGE_ID_NACK>] ... ]
                                 [ <MESSAGE_ID> ]
                                 <ERROR_SPEC> <notify session list>

Berger Standards Track [Page 12] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 <notify session list>       ::= [ <notify session list> ]
                                 <upstream notify session> |
                                 <downstream notify session>
 <upstream notify session>   ::= <SESSION> [ <ADMIN_STATUS> ]
                                 [<POLICY_DATA>...]
                                 <sender descriptor>
 <downstream notify session> ::= <SESSION> [<POLICY_DATA>...]
                                 <flow descriptor list>
 The ERROR_SPEC object specifies the error and includes the IP address
 of either the node that detected the error or the link that has
 failed.  See ERROR_SPEC definition in [RFC2205].  The MESSAGE_ID and
 related objects are defined in [RFC2961] and are used when [RFC2961]
 is supported.

4.3.2. Procedures

 Notify messages are most commonly generated at nodes that detect an
 error that will trigger the generation of a PathErr or ResvErr
 message.  If a PathErr message is to be generated and a Notify
 Request object has been received in the corresponding Path message,
 then a Notify message destined to the recorded node SHOULD be
 generated.  If a ResvErr message is to be generated and a Notify
 Request object has been received in the corresponding Resv message,
 then a Notify message destined to the recorded node SHOULD be
 generated.  As previously mentioned, a single error may generate a
 Notify message in both the upstream and downstream directions.  Note
 that a Notify message MUST NOT be generated unless an appropriate
 Notify Request object has been received.
 When generating Notify messages, a node SHOULD attempt to combine
 notifications being sent to the same Notify Node and that share the
 same ERROR_SPEC into a single Notify message.  The means by which a
 node determines which information may be combined is implementation
 dependent.  Implementations may use event, timer based or other
 approaches.  If using a timer based approach, the implementation
 SHOULD allow the user to configure the interval over which
 notifications are combined.  When using a timer based approach, a
 default "notification interval" of 1 ms SHOULD be used.  Notify
 messages SHOULD be delivered using the reliable message delivery
 mechanisms defined in [RFC2961].
 Upon receiving a Notify message, the Notify Node SHOULD send a
 corresponding Ack message.

Berger Standards Track [Page 13] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

4.4. Removing State with a PathErr message

 The PathErr message as defined in [RFC2205] is sent hop-by-hop to the
 source of the associated Path message.  Intermediate nodes may
 inspect this message, but take no action upon it.  In an environment
 where Path messages are routed according to an IGP and that route may
 change dynamically, this behavior is a fine design choice.
 However, when RSVP is used with explicit routes, it is often the case
 that errors can only be corrected at the source node or some other
 node further upstream.  In order to clean up resources, the source
 must receive the PathErr and then either send a PathTear (or wait for
 the messages to timeout).  This causes idle resources to be held
 longer than necessary and increases control message load.  In a
 situation where the control plane is attempting to recover from a
 serious outage, both the message load and the delay in freeing
 resources hamper the ability to rapidly reconverge.
 The situation can be greatly improved by allowing state to be removed
 by intermediate nodes on certain error conditions.  To facilitate
 this a new flag is defined in the ERROR_SPEC object.  The two
 currently defined ERROR_SPEC objects (IPv4 and IPv6 error spec
 objects) each contain a one byte flag field.  Within that field two
 flags are defined.  This specification defines a third flag, 0x04,
 Path_State_Removed.
 The semantics of the Path_State_Removed flag are simply that the node
 forwarding the error message has removed the Path state associated
 with the PathErr.  By default, the Path_State_Removed flag is always
 set to zero when generating or forwarding a PathErr message.  A node
 which encounters an error MAY set this flag if the error results in
 the associated Path state being discarded.  If the node setting the
 flag is not the session endpoint, the node SHOULD generate a
 corresponding PathTear.  A node receiving a PathErr message
 containing an ERROR_SPEC object with the Path_State_Removed flag set
 MAY also remove the associated Path state.  If the Path state is
 removed the Path_State_Removed flag SHOULD be set in the outgoing
 PathErr message.  A node which does not remove the associated Path
 state MUST NOT set the Path_State_Removed flag.  A node that receives
 an error with the Path_State_Removed flag set to zero MUST NOT set
 this flag unless it also generates a corresponding PathTear message.
 Note that the use of this flag does not result in any
 interoperability incompatibilities.

Berger Standards Track [Page 14] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

5. Explicit Label Control

 The Label ERO (Explicit Route Object) and RRO (Record Route Object)
 subobjects are defined to support Explicit Label Control.  Note that
 the Label RRO subobject was defined in [RFC3209] and is being
 extended to support bidirectional LSPs.

5.1. Label ERO subobject

 The Label ERO subobject is defined as follows:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |L|    Type     |     Length    |U|   Reserved  |   C-Type      |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                             Label                             |
 |                              ...                              |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 See [RFC3471] for a description of L, U and Label parameters.
 Type
    3  Label
 Length
    The Length contains the total length of the subobject in bytes,
    including the Type and Length fields.  The Length is always
    divisible by 4.
 C-Type
    The C-Type of the included Label Object.  Copied from the Label
    Object.

5.1.1. Procedures

 The Label subobject follows a subobject containing the IP address, or
 the interface identifier [RFC3477], associated with the link on which
 it is to be used.  Up to two label subobjects may be present, one for
 the downstream label and one for the upstream label.  The following
 SHOULD result in "Bad EXPLICIT_ROUTE object" errors:
 o If the first label subobject is not preceded by a subobject
   containing an IP address, or an interface identifier [RFC3477],
   associated with an output link.

Berger Standards Track [Page 15] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 o For a label subobject to follow a subobject that has the L-bit set
 o On unidirectional LSP setup, for there to be a label subobject with
   the U-bit set
 o For there to be two label subobjects with the same U-bit values
 To support the label subobject, a node must check to see if the
 subobject following its associate address/interface is a label
 subobject.  If it is, one subobject is examined for unidirectional
 LSPs and two subobjects for bidirectional LSPs.  If the U-bit of the
 subobject being examined is clear (0), then value of the label is
 copied into a new Label_Set object.  This Label_Set object MUST be
 included on the corresponding outgoing Path message.
 If the U-bit of the subobject being examined is set (1), then value
 of the label is label to be used for upstream traffic associated with
 the bidirectional LSP.  If this label is not acceptable, a "Bad
 EXPLICIT_ROUTE object" error SHOULD be generated.  If the label is
 acceptable, the label is copied into a new Upstream_Label object.
 This Upstream_Label object MUST be included on the corresponding
 outgoing Path message.
 After processing, the label subobjects are removed from the ERO.
 Note an implication of the above procedures is that the label
 subobject should never be the first subobject in a newly received
 message.  If the label subobject is the the first subobject an a
 received ERO, then it SHOULD be treated as a "Bad strict node" error.
 Procedures by which an LSR at the head-end of an LSP obtains the
 information needed to construct the Label subobject are outside the
 scope of this document.

5.2. Label RRO subobject

 The Label RRO subobject is defined as follows:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |      Type     |     Length    |U|   Flags     |   C-Type      |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                             Label                             |
 |                              ...                              |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 See [RFC3471] for a description of U and Label parameters.

Berger Standards Track [Page 16] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 Type
    3  Label
 Length
    See [RFC3209].
 Flags
    See [RFC3209].
 C-Type
    The C-Type of the included Label Object.  Copied from the Label
    Object.

5.2.1. Procedures

 Label RRO subobjects are included in RROs as described in [RFC3209].
 The only modification to usage and processing from [RFC3209] is that
 when labels are recorded for bidirectional LSPs, label ERO subobjects
 for both downstream and upstream labels MUST be included.

6. Protection Object

 The use of the Protection Object is optional.  The object is included
 to indicate specific protection attributes of an LSP.  The Protection
 Object uses Class-Number 37 (of form 0bbbbbbb).
 The format of the Protection Object is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (37)|   C-Type (1)  |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |S|                  Reserved                       | Link Flags|
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 See [RFC3471] for a description of parameters.

Berger Standards Track [Page 17] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

6.1. Procedures

 Transit nodes processing a Path message containing a Protection
 Object MUST verify that the requested protection can be satisfied by
 the outgoing interface or tunnel (FA).  If it cannot, the node MUST
 generate a PathErr message, with a "Routing problem/Unsupported Link
 Protection" indication.

7. Administrative Status Information

 Administrative Status Information is carried in the Admin_Status
 object.  The object provides information related to the
 administrative state of a particular LSP.  The information is used in
 two ways.  In the first, the object is carried in Path and Resv
 messages to indicate the administrative state of an LSP.  In the
 second, the object is carried in a Notification message to request
 that the ingress node change the administrative state of an LSP.

7.1. Admin Status Object

 The use of the Admin_Status Object is optional.  It uses Class-Number
 196 (of form 11bbbbbb).
 The format of the Admin_Status Object is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num(196)|   C-Type (1)  |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |R|                        Reserved                       |T|A|D|
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 See [RFC3471] for a description of parameters.

7.2. Path and Resv Message Procedures

 The Admin_Status object is used to notify each node along the path of
 the status of the LSP.  Status information is processed by each node
 based on local policy and then propagated in the corresponding
 outgoing messages.  The object may be inserted in either Path or Resv
 messages at the discretion of the ingress (for Path messages) or
 egress (for Resv messages) nodes.  The absence of the object is
 equivalent to receiving an object containing values all set to zero
 (0).

Berger Standards Track [Page 18] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 Transit nodes receiving a non-refresh Path or Resv message containing
 an Admin_Status object, update their local state, take any
 appropriate local action based on the indicated status and then
 propagate the received Admin_Status object in the corresponding
 outgoing Path or Resv message.  If the values of an Admin_Status
 object received in a Resv message differs from the values received in
 a Path message then, with one exception, no local action should be
 taken but the values should still be propagated.  The one case where
 values received in the Resv message should result in local action is
 when both the received R and D bits are set, i.e., are one (1).
 Edge nodes receiving a non-refresh Path or Resv message containing an
 Admin_Status object, also update their local state and take any
 appropriate local action based on the indicated status.  When an
 Admin Status object is received with the R bit set, the receiving
 edge node should reflect the received values in a corresponding
 outgoing message.  Specifically, if an egress node receives a Path
 message with the R bit of the Admin_Status object set and the node
 has previously issued a Resv message corresponding to the Path
 message, the node SHOULD send an updated Resv message containing an
 Admin_Status object with the same values set, with the exception of
 the R bit, as received in the corresponding Path message.
 Furthermore, the egress node SHOULD also ensure that subsequent Resv
 messages sent by the node contain the same Admin Status Object.
 Additionally, if an ingress node receives a Resv message with the R
 bit of the Admin_Status object set, the node SHOULD send an updated
 Path message containing an Admin_Status object with the same values
 set, with the exception of the R bit, as received in the
 corresponding Resv message.  Furthermore, the ingress node SHOULD
 also ensure that subsequent Path messages sent by the node contain
 the same Admin Status Object.

7.2.1. Deletion procedure

 In some circumstances, particularly optical networks, it is useful to
 set the administrative status of an LSP before tearing it down.  In
 such circumstances the procedure SHOULD be followed when deleting an
 LSP from the ingress:
 1. The ingress node precedes an LSP deletion by inserting an Admin
    Status Object in a Path message and setting the Reflect (R) and
    Delete (D) bits.
 2. Transit and egress nodes process the Admin Status Object as
    described above.  (Alternatively, the egress MAY respond with a
    PathErr message with the Path_State_Removed flag set, see section
    4.4.)

Berger Standards Track [Page 19] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 3. Upon receiving the Admin Status Object with the Delete (D) bit set
    in the Resv message, the ingress node sends a PathTear message
    downstream to remove the LSP and normal RSVP processing takes
    place.
 In such circumstances the procedure SHOULD be followed when deleting
 an LSP from the egress:
 1. The egress node indicates its desire for deletion by inserting an
    Admin Status Object in a Resv message and setting the Reflect (R)
    and Delete (D) bits.
 2. Transit nodes process the Admin Status Object as described above.
 3. Upon receiving the Admin Status Object with the Delete (D) bit set
    in the Resv message, the ingress node sends a PathTear message
    downstream to remove the LSP and normal RSVP processing takes
    place.

7.2.2. Compatibility and Error Procedures

 It is possible that some nodes along an LSP will not support the
 Admin Status Object.  In the case of a non-supporting transit node,
 the object will pass through the node unmodified and normal
 processing can continue.  In the case of a non-supporting egress
 node, the Admin Status Object will not be reflected back in the Resv
 Message.  To support the case of a non-supporting egress node, the
 ingress SHOULD only wait a configurable period of time for the
 updated Admin Status Object in a Resv message.  Once the period of
 time has elapsed, the ingress node sends a PathTear message.  By
 default this period of time SHOULD be 30 seconds.

7.3. Notify Message Procedures

 Intermediate and egress nodes may trigger the setting of
 administrative status via the use of Notify messages.  To accomplish
 this, an intermediate or egress node generates a Notify message with
 the corresponding upstream notify session information.  The Admin
 Status Object MUST be included in the session information, with the
 appropriate bit or bits set.  The Reflect (R) bit MUST NOT be set.
 The Notify message may be, but is not required to be, encapsulated,
 see Section 4.3.
 An ingress node receiving a Notify message containing an Admin Status
 Object with the Delete (D) bit set, SHOULD initiate the deletion
 procedure described in the previous section.  Other bits SHOULD be
 propagated in an outgoing Path message as normal.

Berger Standards Track [Page 20] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

7.3.1. Compatibility and Error Procedures

 Some special processing is required in order to cover the case of
 nodes that do not support the Admin Status Object and other error
 conditions.  Specifically, a node that sends a Notify message
 containing an Admin Status Object with the Down (D) bit set MUST
 verify that it receives a corresponding Path message with the Down
 (D) bit set within a configurable period of time.  By default this
 period of time SHOULD be 30 seconds.  If the node does not receive
 such a Path message, it SHOULD send a PathTear message downstream and
 either a ResvTear message or a PathErr message with the
 Path_State_Removed flag set upstream.

8. Control Channel Separation

 This section provides the protocol specific formats and procedures to
 required support a control channel not being in-band with a data
 channel.

8.1. Interface Identification

 The choice of the data interface to use is always made by the sender
 of the Path message. The choice of the data interface is indicated by
 the sender of the Path message by including the data channel's
 interface identifier in the message using a new RSVP_HOP object sub-
 type.  For bidirectional LSPs, the sender chooses the data interface
 in each direction.  In all cases but bundling, the upstream interface
 is implied by the downstream interface.  For bundling, the path
 sender explicitly identifies the component interface used in each
 direction.  The new RSVP_HOP object is used in Resv message to
 indicate the downstream node's usage of the indicated interface(s).

Berger Standards Track [Page 21] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

8.1.1. IF_ID RSVP_HOP Objects

 The format of the IPv4 IF_ID RSVP_HOP Object is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (3) | C-Type (3)    |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                 IPv4 Next/Previous Hop Address                |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                     Logical Interface Handle                  |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                                                               |
 ~                              TLVs                             ~
 |                                                               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 The format of the IPv6 IF_ID RSVP_HOP Object is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (3) | C-Type (4)    |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                                                               |
 |                 IPv6 Next/Previous Hop Address                |
 |                                                               |
 |                                                               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                     Logical Interface Handle                  |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                                                               |
 ~                              TLVs                             ~
 |                                                               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 See [RFC2205] for a description of hop address and handle fields.
 See [RFC3471] for a description of parameters and encoding of
 TLVs.

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8.1.2. Procedures

 An IF_ID RSVP_HOP object is used in place of previously defined
 RSVP_HOP objects.  It is used on links where there is not a one-to-
 one association of a control channel to a data channel, see
 [RFC3471].  The Hop Address and Logical Interface Handle fields are
 used per standard RSVP [RFC2205].
 TLVs are used to identify the data channel(s) associated with an LSP.
 For a unidirectional LSP, a downstream data channel MUST be
 indicated.  For bidirectional LSPs, a common downstream and upstream
 data channel is normally indicated.  In the special case where a
 bidirectional LSP that traverses a bundled link, it is possible to
 specify a downstream data channel that differs from the upstream data
 channel.  Data channels are specified from the viewpoint of the
 sender of the Path message.  The IF_ID RSVP_HOP object SHOULD NOT be
 used when no TLVs are needed.
 A node receiving one or more TLVs in a Path message saves their
 values and returns them in the HOP objects of subsequent Resv
 messages sent to the node that originated the TLVs.
 Note, the node originating an IF_ID object MUST ensure that the
 selected outgoing interface, as specified in the IF_ID object, is
 consistent with an ERO.  A node that receives an IF_ID object SHOULD
 check whether the information carried in this object is consistent
 with the information carried in a received ERO, and if not it MUST
 send a PathErr Message with the error code "Routing Error" and error
 value of "Bad Explicit Route Object" toward the sender.  This check
 CANNOT be performed when the initial ERO subobject is not the
 incoming interface.

8.2. Errored Interface Identification

 There are cases where it is useful to indicate a specific interface
 associated with an error.  To support these cases the IF_ID
 ERROR_SPEC Objects are defined.

Berger Standards Track [Page 23] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

8.2.1. IF_ID ERROR_SPEC Objects

 The format of the IPv4 IF_ID ERROR_SPEC Object is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (6) | C-Type (3)    |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                     IPv4 Error Node Address                   |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |     Flags     |   Error Code  |          Error Value          |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                                                               |
 ~                              TLVs                             ~
 |                                                               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 The format of the IPv6 IF_ID ERROR_SPEC Object is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num (6) | C-Type (4)    |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                                                               |
 |                     IPv6 Error Node Address                   |
 |                                                               |
 |                                                               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |     Flags     |   Error Code  |          Error Value          |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                                                               |
 ~                              TLVs                             ~
 |                                                               |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 See [RFC2205] for a description of address, flags, error code and
 error value fields.  See [RFC3471] for a description of parameters
 and encoding of TLVs.

8.2.2. Procedures

 Nodes wishing to indicate that an error is related to a specific
 interface SHOULD use the appropriate IF_ID ERROR_SPEC Object in the
 corresponding PathErr or ResvErr message.  IF_ID ERROR_SPEC Objects
 SHOULD be generated and processed as any other ERROR_SPEC Object, see
 [RFC2205].

Berger Standards Track [Page 24] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

9. Fault Handling

 The handling of two types of control communication faults is
 described in this section.  The first, referred to as nodal faults,
 relates to the case where a node losses its control state (e.g.,
 after a restart) but does not loose its data forwarding state.  In
 the second, referred to as control channel faults, relates to the
 case where control communication is lost between two nodes.  The
 handling of both faults is supported by the Restart_Cap object
 defined below and require the use of Hello messages.
 Note, the Restart_Cap object MUST NOT be sent when there is no
 mechanism to detect data channel failures independent of control
 channel failures.
 Please note this section is derived from [PAN-RESTART].

9.1. Restart_Cap Object

 The Restart_Cap Object is carried in Hello messages.
 The format of the Restart_Cap Object is:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |            Length             | Class-Num(131)|  C-Type  (1)  |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                         Restart Time                          |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                        Recovery Time                          |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 Restart Time: 32 bits
    Restart Time is measured in milliseconds.  Restart Time SHOULD be
    set to the sum of the time it takes the sender of the object to
    restart its RSVP-TE component (to the point where it can exchange
    RSVP Hello with its neighbors) and the communication channel that
    is used for RSVP communication.  A value of 0xffffffff indicates
    that the restart of the sender's control plane may occur over an
    indeterminate interval and that the operation of its data plane is
    unaffected by control plane failures.  The method used to ensure
    continued data plane operation is outside the scope of this
    document.

Berger Standards Track [Page 25] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 Recovery Time: 32 bits
    The period of time, in milliseconds, that the sender desires for
    the recipient to re-synchronize RSVP and MPLS forwarding state
    with the sender after the re-establishment of Hello
    synchronization.  A value of zero (0) indicates that MPLS
    forwarding state was not preserved across a particular reboot.

9.2. Processing of Restart_Cap Object

 Nodes supporting state recovery advertise this capability by carrying
 the Restart_Cap object in Hello messages.  Such nodes MUST include
 the Restart_Cap object in all Hello messages. (Note that this
 includes Hello messages containing ACK objects.)  Usage of the
 special case Recovery Time values is described in greater detail
 below.
 When a node receives a Hello message with the Restart_Cap object, it
 SHOULD record the values of the parameters received.

9.3. Modification to Hello Processing to Support State Recovery

 When a node determines that RSVP communication with a neighbor has
 been lost, and the node previously learned that the neighbor supports
 state recovery, the node SHOULD wait at least the amount of time
 indicated by the Restart Time indicated by the neighbor before
 invoking procedures related to communication loss.  A node MAY wait a
 different amount of time based on local policy or configuration
 information.
 During this waiting period, all Hello messages MUST be sent with a
 Dst_Instance value set to zero (0), and Src_Instance should be
 unchanged.  While waiting, the node SHOULD also preserve the RSVP and
 MPLS forwarding state for (already) established LSPs that traverse
 the link(s) between the node and the neighbor.  In a sense with
 respect to established LSPs the node behaves as if it continues to
 receive periodic RSVP refresh messages from the neighbor.  The node
 MAY clear RSVP and forwarding state for the LSPs that are in the
 process of being established when their refresh timers expire.
 Refreshing of Resv and Path state SHOULD be suppressed during this
 waiting period.
 During this waiting period, the node MAY inform upstream nodes of the
 communication loss via a PathErr and/or upstream Notify message with
 "Control Channel Degraded State" indication.  If such notification
 has been sent, then upon restoration of the control channel the node

Berger Standards Track [Page 26] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 MUST inform other nodes of the restoration via a PathErr and/or
 upstream Notify message with "Control Channel Active State"
 indication.  (Specific error codes have been assigned by IANA.)
 When a new Hello message is received from the neighbor, the node must
 determine if the fault was limited to the control channel or was a
 nodal fault.  This determination is based on the Src_Instance
 received from the neighbor.  If the value is different than the value
 that was received from the neighbor prior to the fault, then the
 neighbor should be treated as if it has restarted.  Otherwise, the
 the fault was limited control channel.  Procedures for handling each
 case are described below.

9.4. Control Channel Faults

 In the case of control channel faults, the node SHOULD refresh all
 state shared with the neighbor.  Summary Refreshes [RFC2961] with the
 ACK_Desired flag set SHOULD be used, if supported.  Note that if a
 large number of messages are need, some pacing should be applied.
 All state SHOULD be refreshed within the Recovery time advertised by
 the neighbor.

9.5. Nodal Faults

 Recovering from nodal faults uses one new object and other existing
 protocol messages and objects.

9.5.1. Recovery Label

 The Recovery_Label object is used during the nodal fault recovery
 process.  The format of a Recovery_Label object is identical to a
 generalized label.  A Recovery_Label object uses Class-Number 34 (of
 form 0bbbbbbb) and the C-Type of the label being suggested.

9.5.2. Procedures for the Restarting node

 After a node restarts its control plane, a node that supports state
 recovery SHOULD check whether it was able to preserve its MPLS
 forwarding state.  If no forwarding state from prior to the restart
 was preserved, then the node MUST set the Recovery Time to 0 in the
 Hello message the node sends to its neighbors.
 If the forwarding state was preserved, then the node initiates the
 state recovery process.  The period during which a node is prepared
 to support the recovery process is referred to as the Recovery
 Period.  The total duration of the Recovery Period is advertised by
 the recovering node in the Recovery Time parameter of the Restart_Cap
 object.  The Recovery Time MUST be set to the duration of the

Berger Standards Track [Page 27] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 Recovery Period in all Hello messages sent during the Recovery
 Period.  State that is not resynchronized during the Recovery Period
 SHOULD be removed at the end of the Period.
 Note that if during Hello synchronization the restarting node
 determines that a neighbor does not support state recovery, and the
 restarting node maintains its MPLS forwarding state on a per neighbor
 basis, the restarting node should immediately consider the Recovery
 Period with that neighbor completed.  Forwarding state may be
 considered to be maintained on a per neighbor basis when per
 interface labels are used on point-to-point interfaces.
 When a node receives a Path message during the Recovery Period, the
 node first checks if it has an RSVP state associated with the
 message.  If the state is found, then the node handles this message
 according to previously defined procedures.
 If the RSVP state is not found, and the message does not carry a
 Recovery_Label object, the node treats this as a setup for a new LSP,
 and handles it according to previously defined procedures.
 If the RSVP state is not found, and the message carries a
 Recovery_Label object, the node searches its MPLS forwarding table
 (the one that was preserved across the restart) for an entry whose
 incoming interface matches the Path message and whose incoming label
 is equal to the label carried in the Recovery_Label object.
 If the MPLS forwarding table entry is not found, the node treats this
 as a setup for a new LSP, and handles it according to previously
 defined procedures.
 If the MPLS forwarding table entry is found, the appropriate RSVP
 state is created, the entry is bound to the LSP associated with the
 message, and related forwarding state should be considered as valid
 and refreshed.  Normal Path message processing should also be
 conducted.  When sending the corresponding outgoing Path message the
 node SHOULD include a Suggested_Label object with a label value
 matching the outgoing label from the now restored forwarding entry.
 The outgoing interface SHOULD also be selected based on the
 forwarding entry.  In the special case where a restarting node also
 has a restating downstream neighbor, a Recovery_Label object should
 be used instead of a Suggested_Label object.
 Additionally, for bidirectional LSPs, the node extracts the label
 from the UPSTREAM_LABEL object carried in the received Path message,
 and searches its MPLS forwarding table for an entry whose outgoing

Berger Standards Track [Page 28] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 label is equal to the label carried in the object (in the case of
 link bundling, this may also involved first identifying the
 appropriate incoming component link).
 If the MPLS forwarding table entry is not found, the node treats this
 as a setup for a new LSP, and handles it according to previously
 defined procedures.
 If the MPLS forwarding table entry is found, the entry is bound to
 the LSP associated with the Path message, and the entry should be
 considered to be re-synchronized.  In addition, if the node is not
 the tail-end of the LSP, the corresponding outgoing Path messages is
 sent with the incoming label from that entry carried in the
 UPSTREAM_LABEL object.
 During the Recovery Period, Resv messages are processed normally with
 two exceptions.  In the case that a forwarding entry is recovered, no
 new label or resource allocation is required while processing the
 Resv message.  The second exception is that ResvErr messages SHOULD
 NOT be generated when a Resv message with no matching Path state is
 received.  In this case the Resv message SHOULD just be silently
 discarded.

9.5.3. Procedures for the Neighbor of a Restarting node

 The following specifies the procedures that apply when the node
 reestablishes communication with the neighbor's control plane within
 the Restart Time, the node determines (using the procedures defined
 in Section 5 of [RFC3209]) that the neighbor's control plane has
 restarted, and the neighbor was able to preserve its forwarding state
 across the restart (as was indicated by a non-zero Recovery Time
 carried in the Restart_Cap object of the RSVP Hello messages received
 from the neighbor).  Note, a Restart Time value of 0xffffffff
 indicates an infinite Restart Time interval.
 Upon detecting a restart with a neighbor that supports state
 recovery, a node SHOULD refresh all Path state shared with that
 neighbor.  The outgoing Path messages MUST include a Recovery_Label
 object containing a label value corresponding to the label value
 received in the most recently received corresponding Resv message.
 All Path state SHOULD be refreshed within approximately 1/2 of the
 Recovery time advertised by the restarted neighbor.  If there are
 many LSP's going through the restarting node, the neighbor node
 should avoid sending Path messages in a short time interval, as to
 avoid unnecessary stressing the restarting node's CPU.  Instead, it
 should spread the messages across 1/2 the Recovery Time interval.

Berger Standards Track [Page 29] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 After detecting a restart of a neighbor that supports state recovery,
 all Resv state shared with the restarting node MUST NOT be refreshed
 until a corresponding Path message is received.  This requires
 suppression of normal Resv and Summary Refresh processing to the
 neighbor during the Recovery Time advertised by the restarted
 neighbor.  As soon as a corresponding Path message is received a Resv
 message SHOULD be generated and normal state processing SHOULD be
 re-enabled.

10. RSVP Message Formats and Handling

 This message summarizes RSVP message formats and handling as modified
 by GMPLS.

10.1. RSVP Message Formats

 This section presents the RSVP message related formats as modified by
 this document.  Where they differ, formats for unidirectional LSPs
 are presented separately from bidirectional LSPs.  Unmodified formats
 are not listed.  Again, MESSAGE_ID and related objects are defined in
 [RFC2961].
 The format of a Path message is as follows:

<Path Message> ::= <Common Header> [ <INTEGRITY> ]

                       [ [<MESSAGE_ID_ACK> | <MESSAGE_ID_NACK>] ... ]
                       [ <MESSAGE_ID> ]
                       <SESSION> <RSVP_HOP>
                       <TIME_VALUES>
                       [ <EXPLICIT_ROUTE> ]
                       <LABEL_REQUEST>
                       [ <PROTECTION> ]
                       [ <LABEL_SET> ... ]
                       [ <SESSION_ATTRIBUTE> ]
                       [ <NOTIFY_REQUEST> ]
                       [ <ADMIN_STATUS> ]
                       [ <POLICY_DATA> ... ]
                       <sender descriptor>

Berger Standards Track [Page 30] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 The format of the sender description for unidirectional LSPs is:

<sender descriptor> ::= <SENDER_TEMPLATE> <SENDER_TSPEC>

                       [ <ADSPEC> ]
                       [ <RECORD_ROUTE> ]
                       [ <SUGGESTED_LABEL> ]
                       [ <RECOVERY_LABEL> ]
 The format of the sender description for bidirectional LSPs is:

<sender descriptor> ::= <SENDER_TEMPLATE> <SENDER_TSPEC>

                       [ <ADSPEC> ]
                       [ <RECORD_ROUTE> ]
                       [ <SUGGESTED_LABEL> ]
                       [ <RECOVERY_LABEL> ]
                       <UPSTREAM_LABEL>
 The format of a PathErr message is as follows:

<PathErr Message> ::= <Common Header> [ <INTEGRITY> ]

                       [ [<MESSAGE_ID_ACK> | <MESSAGE_ID_NACK>] ... ]
                       [ <MESSAGE_ID> ]
                       <SESSION> <ERROR_SPEC>
                       [ <ACCEPTABLE_LABEL_SET> ... ]
                       [ <POLICY_DATA> ... ]
                       <sender descriptor>
 The format of a Resv message is as follows:

<Resv Message> ::= <Common Header> [ <INTEGRITY> ]

                       [ [<MESSAGE_ID_ACK> | <MESSAGE_ID_NACK>] ... ]
                       [ <MESSAGE_ID> ]
                       <SESSION> <RSVP_HOP>
                       <TIME_VALUES>
                       [ <RESV_CONFIRM> ]  [ <SCOPE> ]
                       [ <NOTIFY_REQUEST> ]
                       [ <ADMIN_STATUS> ]
                       [ <POLICY_DATA> ... ]
                       <STYLE> <flow descriptor list>
 <flow descriptor list> is not modified by this document.

Berger Standards Track [Page 31] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 The format of a ResvErr message is as follows:

<ResvErr Message> ::= <Common Header> [ <INTEGRITY> ]

                       [ [<MESSAGE_ID_ACK> | <MESSAGE_ID_NACK>] ... ]
                       [ <MESSAGE_ID> ]
                       <SESSION> <RSVP_HOP>
                       <ERROR_SPEC> [ <SCOPE> ]
                       [ <ACCEPTABLE_LABEL_SET> ... ]
                       [ <POLICY_DATA> ... ]
                       <STYLE> <error flow descriptor>
 The modified Hello message format is:

<Hello Message> ::= <Common Header> [ <INTEGRITY> ] <HELLO>

                  [ <RESTART_CAP> ]

10.2. Addressing Path, PathTear and ResvConf Messages

 RSVP was designed to handle dynamic (non-explicit) path changes and
 non RSVP hops along the path.  To this end, the Path, PathTear and
 ResvConf messages carry the destination address of the session in the
 IP header.  In generalized signaling, routes are usually explicitly
 signaled.  Further, hops that cannot allocate labels cannot exist in
 the path of an LSP.  A further difference with traditional RSVP is
 that at times, an RSVP message may travel out of band with respect to
 an LSP's data channel.
 When a node is sending a Path, PathTear or ResvConf message to a node
 that it knows to be adjacent at the data plane (i.e., along the path
 of the LSP), it SHOULD address the message directly to an address
 associated with the adjacent node's control plane.  In this case the
 router-alert option SHOULD not be included.

11. Acknowledgments

 This document is the work of numerous authors and consists of a
 composition of a number of previous documents in this area.
 Valuable comments and input were received from a number of people,
 including Igor Bryskin, Adrian Farrel and Dimitrios Pendarakis.
 Portions of Section 4 are based on suggestions and text proposed by
 Adrian Farrel.
 The security considerations section is based on text provided by
 Steven Bellovin.

Berger Standards Track [Page 32] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

12. Security Considerations

 RSVP message security is described in [RFC2747] and provides message
 integrity and node authentication.  For hop-by-hop messages, this
 document introduces no other new security considerations.
 This document introduces the ability to send a Notify message in a
 non-hop-by-hop fashion.  This precludes RSVP's hop-by-hop integrity
 and authentication model.  In the case where RSVP is generating end-
 to-end messages and the same level of security provided by [RFC2747]
 is desired, the standard IPSEC based integrity and authentication can
 be used.  Alternatively, the sending of no-hop-by-hop Notify messages
 can be disabled.
 When using IPSEC to provide message authentication, the following
 apply:
    Selectors
       The selector is identified by RSVP messages exchanged between a
       pair of non-adjacent nodes.  The nodes are identified by the
       source and destination IP address of the inner IP header used
       on Notify messages.
    Mode
       In this application, transport mode is the proper choice.  The
       information being communicated is generally not confidential,
       so encryption need not be used.  Either AH [RFC2402] or ESP
       [RFC2406] MAY be used; if ESP is used, the sender's IP address
       MUST be checked against the IP address asserted in the key
       management exchange.
    Key Management
       To permit replay detection, an automated key management system
       SHOULD be used, most likely IKE [RFC2409].  Configured keys MAY
       be used.
    Security Policy
       Messages MUST NOT be accepted except from nodes that are not
       known to the recipient to be authorized to make such requests.
    Identification
       Shared keys mechanisms should be adequate for initial
       deployments and smaller networks.  For larger-scale
       deployments, certificate-based IKE should be supported.
       Whatever scheme is used, it must tie back to a source IP
       address in some fashion.

Berger Standards Track [Page 33] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

    Availability
       Many routers and switches already support IPSEC.  For cases
       where IPSEC is unavailable and security is required, Notify
       messages MUST be sent hop-by-hop.

13. IANA Considerations

 IANA assigns values to RSVP protocol parameters.  Within the current
 document multiple objects are defined.  Each of these objects contain
 C-Types.  This section defines the rules for the assignment of the
 related C-Type values.  This section uses the terminology of BCP 26
 "Guidelines for Writing an IANA Considerations Section in RFCs"
 [BCP26].
 As per [RFC2205], C-Type is an 8-bit number that identifies the
 function of an object.  All possible values except zero are available
 for assignment.
 The assignment of C-Type values of the objects defined in this
 document fall into three categories.  The first category inherit C-
 Types from the Label object, i.e., object class number 16 [RFC3209].
 IANA is requested to institute a policy whereby all C-Type values
 assign for the Label object are also assigned for the following
 objects:
    o Suggested_Label    (Class-Num 129)
    o Upstream_Label     (Class-Num 35)
    o Recovery_Label     (Class-Num 34)
 The second category of objects follow independent policies.
 Specifically, following the policies outlined in [BCP26], C-Type
 values in the range 0x00 - 0x3F are allocated through an IETF
 Consensus action, values in the range 00x40 - 0x5F are allocated as
 First Come First Served, and values in the range 0x60 - 0x7F are
 reserved for Private Use.  This policy applies to the following
 objects.
    o Label_Set          (Class-Num 36)
    o Notify_Request     (Class-Num 195)
    o Protection         (Class-Num 37)
    o Admin Status       (Class-Num 196)
    o Restart_Cap        (Class-Num 131)
 The assignment of C-Type values for the remaining object, the
 Acceptable_Label_Set object, follows the assignment of C-Type values
 of the Label_Set object.  IANA will institute a policy whereby all
 C-Type values assigned for the Label_Set object are also assigned for
 the Acceptable_Label_Set object.

Berger Standards Track [Page 34] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

13.1. IANA Assignments

 This section summarizes values used in this document that have been
 assigned by IANA.
  1. ——————————————————————–

Message Types

 o Notify message (Message type = 21)
  1. ——————————————————————–

Class Types

 o RSVP_HOP (C-Num 3)
   - IPv4 IF_ID RSVP_HOP (C-type = 3)
   - IPv6 IF_ID RSVP_HOP (C-type = 4)
 o ERROR_SPEC (C-Num 6)
   - IPv4 IF_ID ERROR_SPEC (C-type = 3)
   - IPv6 IF_ID ERROR_SPEC (C-type = 4)
 o LABEL_REQUEST (Class-Num 19)
   - Generalized_Label_Request (C-Type = 4)
 o RSVP_LABEL (Class-Num = 16)
   - Generalized_Label (C-Type = 2)
   - Waveband_Switching_Label C-Type (C-Type = 3)
  1. ——————————————————————–

New Class-Nums, C-Types inherited from Label object (same as CNum16)

 o RECOVERY_LABEL     Class-Num of form 0bbbbbbb (= 34)
 o SUGGESTED_LABEL    Class-Num of form 10bbbbbb (= 129)
 o UPSTREAM_LABEL     Class-Num of form 0bbbbbbb (= 35)
  1. ——————————————————————–

New Class-Nums

 o LABEL_SET                 Class-Num of form 0bbbbbbb (= 36)
   - Type 1               (C-Type = 1)
 o ACCEPTABLE_LABEL_SET      Class-Num of form 10bbbbbb (= 130)
   - Type 1 Acceptable_Label_Set (C-type from label_set cnum)
 o NOTIFY_REQUEST            Class-Num of form 11bbbbbb (= 195)
   - IPv4 Notify Request  (C-Type = 1)
   - IPv6 Notify Request  (C-Type = 2)
 o PROTECTION                Class-Num of form 0bbbbbbb (= 37)
   - Type 1               (C-Type = 1)

Berger Standards Track [Page 35] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 o ADMIN STATUS              Class-Num of form 11bbbbbb (= 196)
   - Type 1               (C-Type = 1)
 o RESTART_CAP               Class-Num of form 10bbbbbb (= 131)
   - Type 1               (C-Type = 1)
 ---------------------------------------------------------------------
 ERO/RRO subobject types
 o Label ERO subobject
   Type 3 - Label
 o Label RRO subobject
   Type 3 - Label
 ---------------------------------------------------------------------
 Error codes
 o "Routing problem/Label Set"                   (value = 11)
 o "Routing problem/Switching Type"              (value = 12)
                                      (duplicate code 13 dropped)
 o "Routing problem/Unsupported Encoding"        (value = 14)
 o "Routing problem/Unsupported Link Protection" (value = 15)
 o "Notify Error/Control Channel Active State"   (value = 4)
 o "Notify Error/Control Channel Degraded State" (value = 5)
 ---------------------------------------------------------------------

14. Intellectual Property Considerations

 This section is taken from Section 10.4 of [RFC2026].
 The IETF takes no position regarding the validity or scope of any
 intellectual property 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; neither does it represent that it
 has made any effort to identify any such rights.  Information on the
 IETF's procedures with respect to rights in standards-track and
 standards-related documentation can be found in BCP-11.  Copies of
 claims of rights made available for publication 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 implementors or users of this specification can
 be obtained from the IETF Secretariat.
 The IETF invites any interested party to bring to its attention any
 copyrights, patents or patent applications, or other proprietary
 rights which may cover technology that may be required to practice
 this standard.  Please address the information to the IETF Executive
 Director.

Berger Standards Track [Page 36] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

15. References

15.1. Normative References

 [RFC2119]        Bradner, S., "Key words for use in RFCs to Indicate
                  Requirement Levels", BCP 14, RFC 2119, March 1997.
 [RFC2205]        Braden, R. (Ed.), Zhang, L., Berson, S., Herzog, S.
                  and S. Jamin, "Resource ReserVation Protocol --
                  Version 1 Functional Specification", RFC 2205,
                  September 1997.
 [RFC2210]        Wroclawski, J., "The Use of RSVP with IETF
                  Integrated Services", RFC 2210, September 1997.
 [RFC2402]        Kent, S. and R. Atkinson, "IP Authentication
                  Header", RFC 2401, November 1998.
 [RFC2406]        Kent, S. and R. Atkinson, "IP Encapsulating Security
                  Payload (ESP)", RFC 2401, November 1998.
 [RFC2409]        Harkins, D. and D. Carrel, "The Internet Key
                  Exchange (IKE)", RFC 2409, November 1998.
 [RFC2747]        Baker, F., Lindell, B. and M. Talwar, "RSVP
                  Cryptographic Authentication", RFC 2747, January
                  2000.
 [RFC2961]        Berger, L., Gan, D., Swallow, G., Pan, P., Tommasi,
                  F. and S. Molendini, "RSVP Refresh Overhead
                  Reduction Extensions", RFC 2961, April 2001.
 [RFC3209]        Awduche, D., Berger, L., Gan, D., Li, T.,
                  Srinivasan, V. and G. Swallow, "RSVP-TE: Extensions
                  to RSVP for LSP Tunnels", RFC 3209, December 2001.
 [RFC3471]        Berger, L., Editor, "Generalized Multi-Protocol
                  Label Switching (GMPLS) Signaling Functional
                  Description", RFC 3471, January 2003.
 [RFC3477]        Kompella, K. and Y. Rekhter, "Signalling Unnumbered
                  Links in Resource Reservation Protocol - Traffic
                  Engineering (RSVP-TE)", RFC 3477, January 2003.

Berger Standards Track [Page 37] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

15.2. Informative References

 [BCP26]          Narten, T. and H. Alvestrand, "Guidelines for
                  Writing an IANA Considerations Section in RFCs", BCP
                  26, RFC 2434, October 1998.
 [MPLS-HIERARCHY] Kompella, K. and Y. Rekhter, "LSP Hierarchy with
                  MPLS TE", Work in Progress.
 [PAN-RESTART]    Pan, P., et. al., "Graceful Restart Mechanism for
                  RSVP-TE", Work in Progress.
 [RFC2026]        Bradner, S., "The Internet Standards Process --
                  Revision 3", BCP 9, RFC 2026, October 1996.

16. Contributors

 Peter Ashwood-Smith
 Nortel Networks Corp.
 P.O. Box 3511 Station C,
 Ottawa, ON K1Y 4H7
 Canada
 Phone:  +1 613 763 4534
 EMail:  petera@nortelnetworks.com
 Ayan Banerjee
 Calient Networks
 5853 Rue Ferrari
 San Jose, CA 95138
 Phone:  +1 408 972-3645
 EMail:  abanerjee@calient.net
 Lou Berger
 Movaz Networks, Inc.
 7926 Jones Branch Drive
 Suite 615
 McLean VA, 22102
 Phone:  +1 703 847-1801
 EMail:  lberger@movaz.com

Berger Standards Track [Page 38] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 Greg Bernstein
 EMail:  gregb@grotto-networking.com
 John Drake
 Calient Networks
 5853 Rue Ferrari
 San Jose, CA 95138
 Phone:  +1 408 972 3720
 EMail:  jdrake@calient.net
 Yanhe Fan
 Axiowave Networks, Inc.
 200 Nickerson Road
 Marlborough, MA 01752
 Phone: + 1 774 348 4627
 EMail: yfan@axiowave.com
 Kireeti Kompella
 Juniper Networks, Inc.
 1194 N. Mathilda Ave.
 Sunnyvale, CA 94089
 EMail:  kireeti@juniper.net
 Jonathan P. Lang
 EMail:  jplang@ieee.org
 Fong Liaw
 Solas Research, LLC
 EMail:  fongliaw@yahoo.com

Berger Standards Track [Page 39] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 Eric Mannie
 Independent Consultant
 2 Avenue de la Folle Chanson
 1050 Brussels
 Belgium
 EMail:  eric_mannie@hotmail.com
 Ping Pan
 Ciena
 10480 Ridgeview Court
 Cupertino, CA 95014
 Phone:  408-366-4700
 EMail:  ppan@ciena.com
 Bala Rajagopalan
 Tellium, Inc.
 2 Crescent Place
 P.O. Box 901
 Oceanport, NJ 07757-0901
 Phone:  +1 732 923 4237
 Fax:    +1 732 923 9804
 EMail:  braja@tellium.com
 Yakov Rekhter
 Juniper Networks, Inc.
 EMail:  yakov@juniper.net
 Debanjan Saha
 EMail:  debanjan@acm.org

Berger Standards Track [Page 40] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

 Vishal Sharma
 Metanoia, Inc.
 1600 Villa Street, Unit 352
 Mountain View, CA 94041-1174
 Phone:  +1 650-386-6723
 EMail:  v.sharma@ieee.org
 George Swallow
 Cisco Systems, Inc.
 250 Apollo Drive
 Chelmsford, MA 01824
 Phone:  +1 978 244 8143
 EMail:  swallow@cisco.com
 Z. Bo Tang
 EMail:  botang01@yahoo.com

17. Editor's Address

 Lou Berger
 Movaz Networks, Inc.
 7926 Jones Branch Drive
 Suite 615
 McLean VA, 22102
 Phone:  +1 703 847-1801
 EMail:  lberger@movaz.com

Berger Standards Track [Page 41] RFC 3473 GMPLS Signaling - RSVP-TE Extensions January 2003

18. Full Copyright Statement

 Copyright (C) The Internet Society (2003).  All Rights Reserved.
 This document and translations of it may be copied and furnished to
 others, and derivative works that comment on or otherwise explain it
 or assist in its implementation may be prepared, copied, published
 and distributed, in whole or in part, without restriction of any
 kind, provided that the above copyright notice and this paragraph are
 included on all such copies and derivative works.  However, this
 document itself may not be modified in any way, such as by removing
 the copyright notice or references to the Internet Society or other
 Internet organizations, except as needed for the purpose of
 developing Internet standards in which case the procedures for
 copyrights defined in the Internet Standards process must be
 followed, or as required to translate it into languages other than
 English.
 The limited permissions granted above are perpetual and will not be
 revoked by the Internet Society or its successors or assigns.
 This document and the information contained herein is provided on an
 "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
 TASK FORCE DISCLAIMS 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.

Acknowledgement

 Funding for the RFC Editor function is currently provided by the
 Internet Society.

Berger Standards Track [Page 42]

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