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:rfc6478

Internet Engineering Task Force (IETF) L. Martini Request for Comments: 6478 G. Swallow Updates: 5885 G. Heron Category: Standards Track Cisco ISSN: 2070-1721 M. Bocci

                                                        Alcatel-Lucent
                                                              May 2012
              Pseudowire Status for Static Pseudowires

Abstract

 This document specifies a mechanism to signal Pseudowire (PW) status
 messages using a PW associated channel (ACh).  Such a mechanism is
 suitable for use where no PW dynamic control plane exits, known as
 static PWs, or where a Terminating Provider Edge (T-PE) needs to send
 a PW status message directly to a far-end T-PE.  The mechanism allows
 PW Operations, Administration, and Maintenance (OAM) message mapping
 and PW redundancy to operate on static PWs.  This document also
 updates RFC 5885 in the case when Bi-directional Forwarding Detection
 (BFD) is used to convey PW status-signaling information.

Status of This Memo

 This is an Internet Standards Track document.
 This document is a product of the Internet Engineering Task Force
 (IETF).  It represents the consensus of the IETF community.  It has
 received public review and has been approved for publication by the
 Internet Engineering Steering Group (IESG).  Further information on
 Internet Standards is available in Section 2 of RFC 5741.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 http://www.rfc-editor.org/info/rfc6478.

Martini, et al. Standards Track [Page 1] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

Copyright Notice

 Copyright (c) 2011 IETF Trust and the persons identified as the
 document authors.  All rights reserved.
 This document is subject to BCP 78 and the IETF Trust's Legal
 Provisions Relating to IETF Documents
 (http://trustee.ietf.org/license-info) in effect on the date of
 publication of this document.  Please review these documents
 carefully, as they describe your rights and restrictions with respect
 to this document.  Code Components extracted from this document must
 include Simplified BSD License text as described in Section 4.e of
 the Trust Legal Provisions and are provided without warranty as
 described in the Simplified BSD License.

Table of Contents

 1. Introduction ....................................................3
 2. Specification of Requirements ...................................3
 3. Terminology .....................................................3
 4. Applicability ...................................................3
 5. Pseudowire Status Operation .....................................4
    5.1. PW OAM Message .............................................4
    5.2. Sending a PW Status Message ................................5
    5.3. PW OAM Status Message Transmit and Receive .................6
         5.3.1. Acknowledgment of PW Status .........................7
    5.4. MPLS Label Stack ...........................................7
         5.4.1. Label Stack for a Message Destined to the Next PE ...8
         5.4.2. Label Stack for a Message Destined to the Egress PE .8
    5.5. S-PE Bypass Mode ...........................................8
         5.5.1. S-PE Bypass Mode LDP Flag Bit .......................9
 6. S-PE Operation .................................................10
    6.1. Static PW to Another Static PW ............................10
    6.2. Dynamic PW to Static PW or Vice Versa .....................10
 7. Security Considerations ........................................11
 8. IANA Considerations ............................................11
 9. References .....................................................11
    9.1. Normative References ......................................11
    9.2. Informative References ....................................12

Martini, et al. Standards Track [Page 2] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

1. Introduction

 The default control plane for Pseudowire (PW) technology, as defined
 in [RFC4447], is based on the Label Distribution Protocol (LDP).
 However, that document also describes a static provisioning mode
 without a control plane.  When a static PW is used, there is no
 method to transmit the status of the PW or attachment circuit (AC)
 between the two Provider Edge (PE) devices at each end of the PW.
 This document defines a method to transport the PW status codes
 defined in Section 5.4.2 of [RFC4447] and elsewhere [REDUNDANCY] in-
 band with the PW data using a generic associated channel [RFC5586].

2. Specification of Requirements

 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].

3. Terminology

 ACh:   Associated Channel
 ACH:   Associated Channel Header
 FEC:   Forwarding Equivalence Class
 LDP:   Label Distribution Protocol
 LSP:   Label Switching Path
 MS-PW: Multi-Segment Pseudowire
 PE:    Provider Edge
 PW:    Pseudowire
 SS-PW: Single-Segment Pseudowire
 S-PE:  Switching Provider Edge Node of MS-PW
 T-PE:  Terminating Provider Edge Node of MS-PW

4. Applicability

 As described in [RFC4447] and [RFC6310], a PE that establishes an
 MPLS PW using means other than LDP, e.g., by static configuration,
 MUST support some alternative method of status reporting.  The

Martini, et al. Standards Track [Page 3] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

 procedures described in this document are for use when PWs are
 statically configured and an LDP control plane is not available.
 As defined in [RFC4447], a PE that establishes a PW using LDP MUST
 use the PW status TLV mechanism for AC and PW status and defect
 notification on that PW.  In order to avoid duplicate notifications
 and potentially conflicting notifications, such PEs MUST NOT use the
 mechanisms described in this document for those PWs, except that the
 S-PE bypass mode described in Section 5.5 MAY be used when both T-PEs
 at each end of the PW use LDP to establish the PW.
 In order to protect against duplicate notifications and potentially
 conflicting notifications, when the Pseudowire Status protocol for
 Static Pseudowires described in this document is used, the BFD VCCV
 (Virtual Circuit Connectivity Verification) status-signaling
 mechanisms described in [RFC5885] (CV Types 0x08 and 0x20) MUST NOT
 be used.  BFD VCCV for fault detection (CV types 0x04 and 0x10) MAY
 still be used.

5. Pseudowire Status Operation

5.1. PW OAM Message

 The PW status TLV as defined in Section 5.4.2 of [RFC4447] is
 transported in a PW OAM message using the PW ACH.
   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
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  |0 0 0 1|Version|   Reserved    | 0x0027 PW OAM Message         |
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  |         Refresh Timer         |  TLV Length   |A|   Flags     |
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  |                                                               |
  ~                              TLVs                             ~
  |                                                               |
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Figure 1: ACh PW OAM Message Packet Header
 The first 32 bits are the standard ACH header construct as defined in
 [RFC5586].
 The first nibble (0001b) indicates the ACH instead of PW data.  The
 version and the reserved values are both set to 0 as specified in
 [RFC4385].

Martini, et al. Standards Track [Page 4] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

 The refresh timer is an unsigned integer and specifies refresh time
 in seconds with a range from 1 to 65535.  The value 0 means that the
 refresh timer is set to infinity, and the PW OAM message will never
 be refreshed, and will never timeout.
 The TLV length field indicates the length of all TLVs only.  This
 document defines only the transport of the PW status TLV, as defined
 in Section 5.4.2, [RFC4447], in the TLV field.  In the future,
 additional TLVs may be defined to be used in this field with code
 points allocated from the IANA registry called "LDP TLV Type Name
 Space".
 The A flag bit is used to indicate an acknowledgment of the PW status
 TLV included.  The rest of the flag bits are reserved and they MUST
 be set to 0 on transmit, and ignored upon receipt.  When the A bit is
 set, the refresh timer value is a requested timer value.
 The PW OAM Message code point value is 0x0027.

5.2. Sending a PW Status Message

 The PW Status messages are sent in-band using the PW OAM message
 containing the PW Status TLV for a particular PW, as defined in
 [RFC4447].  The PW Status TLV format is almost as defined in
 [RFC4447] and is repeated here for the reader's convenience:
   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
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  |Res|     PW Status (0x096A)    |            Length             |
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  |                          Status Code                          |
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    Figure 2: PW Status TLV Format
 Unlike the case in [RFC4447], here, the first 2 bits are reserved,
 and MUST be set to zero on transmit and ignored on receipt.
 The PW Status TLV is prepended with a PW OAM message header and sent
 on the ACh of the PW to which the status update applies.
 To clear a particular status indication, the PE needs to send a new
 PW OAM message containing a PW Status TLV with the corresponding bit
 cleared as defined in [RFC4447].
 The procedures described in [RFC6073] that apply to an S-PE and PW
 using an LDP control plane also apply when sending PW status using

Martini, et al. Standards Track [Page 5] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

 the PW OAM channel.  The OPTIONAL procedures using the SP-PE TLV
 described in [RFC6073] can also be applied when sending PW status
 using the PW OAM channel.
 The detailed message transmit and message receive procedures are
 specified in the next section.  PW OAM status messages MUST NOT be
 used as a connectivity verification method.

5.3. PW OAM Status Message Transmit and Receive

 Unlike the PW status procedures defined in [RFC4447], with this
 method there is no TCP/IP session or session management.  Therefore,
 unlike the TCP/IP case, where each message is sent only once, the PW
 OAM message containing the PW status TLV needs to be transmitted
 repeatedly to ensure reliable message delivery.  If a malformed TLV
 or an unknown TLV is received in a PW OAM status message, the TLV
 MUST be ignored, and the PE SHOULD report the event to the operator.
 A PW OAM message containing a PW status TLV with a new status bit set
 or reset will be transmitted immediately by the PE.  Unless the
 message is acknowledged within a second, the PW OAM message will then
 be repeated twice more at an initial interval of one second.
 Subsequently, the PW OAM message will be transmitted with an interval
 specified by the refresh timer value in the packet.  Note that this
 value MAY be updated in the new PW OAM message packet, in which case
 the new refresh timer value becomes the new packet transmit interval.
 The suggested default value for the refresh timer is 600 seconds.
 This default is adequate for typical deployments, and PEs are
 designed to take into account processing these messages at the
 required rate.
 When a PW OAM message containing a status TLV is received, a timer is
 started according to the refresh rate specified in the packet.  If
 another non-zero PW status message is not received within 3.5 times
 the specified timer value, the status condition will timeout in 3.5
 times the last refresh timer value received, and the default status
 of zero is assumed on the PW.  It is also a good practice to
 introduce some jitter in the delay between refresh transmissions, as
 long as the maximum jitter delay is within the prescribed maximum
 refresh time of 3.5 times the specified timer value for 3 consecutive
 refresh packets.
 To clear a particular status fault, the PE need only send an updated
 message with the corresponding bit cleared.  If the PW status code is
 zero, the PW OAM message will be sent like any other PW OAM status
 message using the procedures described above; however, transmission
 will cease after 3 PW status messages have been sent at one second

Martini, et al. Standards Track [Page 6] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

 intervals and before the refresh timer expires.  A PW status message
 of zero MAY be acknowledged using the procedures described in Section
 5.3.1.  If it is acknowledged, then a timer value of zero MUST be
 used.  This SHOULD cause the PE sending the PW status notification
 message with a PW status code equal to zero to stop sending and to
 continue normal operation.

5.3.1. Acknowledgment of PW Status

 A PE receiving a PW OAM message containing a PW status message MAY
 acknowledge the PW status message by simply building a reply packet
 with the same format and status code as the received PW OAM message,
 but with the A bit set, and transmitting it on the PW ACh back to the
 source of the PW OAM message.  The receiving PE MAY use the refresh
 timer field in the acknowledgement packet to request a new refresh
 interval from the originator of the PW OAM message.  The timer value
 set in the reply packet SHOULD then be used by the originator of the
 PW OAM message as the new transmit interval.  If the requested
 refresh timer value is to be used, then, when the the current timer
 expires, the PW OAM message transmission interval is set to the new
 value and the new value is sent in the PW OAM message.  If the
 transmitting PE does not want to use the new timer value (for local
 policy reasons, or because it simply cannot support it), it MUST
 refresh the PW OAM message with the timer value it desires.  The
 receiving PE will then set its timeout timer according to the new
 refresh timer value that is in the packet received, regardless of
 what timer value it requested.  The receiving PE MUST NOT request a
 new refresh timer value more than once per refresh interval.
 The suggested default value for the refresh timer value in the
 acknowledgment packet is 600 seconds.
 If the sender PE receives an acknowledgment message that does not
 match the current active PW status message being sent, it simply
 ignores the acknowledgment packet.
 If a PE that has received a non-zero status code for a PW detects by
 any means that the far end PE has become unreachable, it will follow
 the standard defect entry procedures of [RFC6310], Section 6.2.

5.4. MPLS Label Stack

 With one exception, all PW OAM status messages are sent to the
 adjacent PE across the PSN tunnel.  In many cases, the transmitting
 PE has no way to determine whether the adjacent PE is an S-PE or a
 T-PE.  This is a necessary behavior to preserve backward
 compatibility with PEs that do not understand MS-PWs.  In the
 procedures described in this document, there are two possible

Martini, et al. Standards Track [Page 7] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

 destinations for the PW OAM status messages: the adjacent PE or the
 T-PE.  Sending a PW status message directly to the T-PE is an
 enhanced method that is only applicable using PW OAM status messages
 sent in the PW ACH.

5.4.1. Label Stack for a Message Destined to the Next PE

 A PE that needs to forward a PW OAM status message to the adjacent PE
 across the PSN tunnel MUST set the PW label TTL field to 1.
 Furthermore, if the control word is not in use on the particular PW,
 the PE MUST place the GAL reserved label [RFC5586] below the PW label
 with the TTL field set to 1.

5.4.2. Label Stack for a Message Destined to the Egress PE

 This is also known as "S-PE bypass mode"; see below.  A T-PE that
 requires sending a PW OAM status message directly to the
 corresponding T-PE at the other end of the PW MUST set the TTL of the
 PW label to a value that is sufficient to reach the corresponding
 T-PE.  This value will be greater than one, but will be set according
 to the local policy on the transmitting T-PE.  Furthermore, if the
 control word is not in use on the particular PW, the PE MUST also
 place the GAL reserved label [RFC5586] below the PW label with the
 TTL field set to 1.

5.5. S-PE Bypass Mode

 S-PE bypass mode enables a T-PE that uses LDP as the PW setup and
 control protocol to bypass all S-PEs that might be present along the
 MS-PW and to send a message directly to the remote T-PE.  This is
 used for very fast message transmission in-band with the PW PDUs.
 This mode is OPTIONAL and MUST be supported by both T-PEs to be
 enabled.  This mode MUST NOT be used if the first PW segment
 connected to each T-PE is not using LDP.
 Note that this method MUST NOT be used to send messages that are
 permitted to originate at an S-PE.  Otherwise, race conditions could
 occur between messages sent via the control plane by S-PEs and
 messages sent via the data plane by T-PEs.
 Status codes, except for those listed below, MUST NOT be sent using
 the S-PE bypass procedure and MUST be ignored on reception.
    0x00000002 - Local Attachment Circuit (ingress) Receive Fault
    0x00000004 - Local Attachment Circuit (egress) Transmit Fault
    0x00000020 - PW forwarding standby

Martini, et al. Standards Track [Page 8] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

    0x00000040 - Request switchover to this PW
 Note that since "clear all failures" may be sent by an S-PE, it MUST
 NOT be sent using the S-PE bypass mode.
 When S-PE bypass mode is enabled, all PW Status TLVs received using
 this method have priority over PW Status TLVs sent via control
 protocols such as LDP [RFC4447].  However, the same PW Status TLVs
 MUST also be sent in LDP to keep the S-PEs state updated.

5.5.1. S-PE Bypass Mode LDP Flag Bit

 When a PW Segment along an MS-PW is using the LDP control protocol
 and wishes to request the use of the S-PE bypass status message mode,
 it sets the B bit in the generic protocol flags interface parameters
 sub-TLV as shown in Figure 3.  This flag can only be set by a T-PE
 using LDP as the PW configuration and management protocol.  If the
 S-PE bypass mode LDP flag bit in the generic protocol flags interface
 parameter does not match in the FEC advertisement for directions of a
 specific PW, that PW MUST NOT be enabled.
 The interface parameter 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=0x18  |   Length=4    |R R R R R R R R R R R R R R R B|
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Figure 3: PW Generic Protocol Flags Sub-TLV
 TLV Type
    Type 0x18 - PW Generic Protocol Flags.
 Length
    TLV length is always 4 octets.
 Flags
    Bit B, in position 31 above, is set to request the S-PE bypass
    mode.  R bits are to be allocated by IANA as described in the IANA
    section.  If they are not allocated, they are to be considered as
    reserved for future use and MUST be zero on transmission and
    ignored on reception of this TLV.

Martini, et al. Standards Track [Page 9] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

    If the T-PE receives an LDP label mapping message containing a
    generic protocol flags interface parameter TLV with the bit B set,
    then the T-PE receiving the label mapping message MAY send S-PE
    bypass status messages in the PW ACh.  If bit B of said TLV is not
    set, or the TLV is not present, then the T-PE receiving the label
    mapping message MUST NOT send S-PE bypass status messages in the
    PW ACh.

6. S-PE Operation

 The S-PE will operate according to the procedures defined in
 [RFC6073].  The following additional procedures apply to the case
 where a static PW segment is switched to a dynamic PW segment that
 uses LDP, and the case where a static PW segment is switched to
 another static PW segment.

6.1. Static PW to Another Static PW

 The procedures that are described in [RFC6073] Section 10 also apply
 to the case of a static PW switched to another static PW.  The LDP
 header is simply replaced by the PW OAM header; otherwise, the packet
 format will be identical.  The information that is necessary to form
 an SP-PE TLV MUST be configured in the S-PE, or no SP-PE TLV will be
 sent.  [RFC6073] defines the IANA "Pseudowire Switching Point PE TLV
 Type" registry.  In order to support the static PW configuration and
 addressing scheme, the following new code point has been assigned:
    Type  Length   Description
    ----  ------   -----------
    0x07      24   Static PW/MPLS-TP PW segment ID of last
                   PW segment traversed
 The format of this TLV is that of the "Static Pseudowire Sub-TLV"
 defined in [RFC6426].

6.2. Dynamic PW to Static PW or Vice Versa

 The procedures that are described in Section 10 of [RFC6073] also
 apply to this situation.  However, if the PW label of the LDP-
 controlled PW segment is withdrawn by the adjacent PE, the S-PE will
 set the PW status code "0x00000001 - Pseudowire Not Forwarding" to
 the adjacent PW on the static PW segment.
 The S-PE will only withdraw its label for the dynamic, LDP-controlled
 PW segment if the S-PE is not provisioned.

Martini, et al. Standards Track [Page 10] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

7. Security Considerations

 The security measures described in [RFC4447], [RFC5085], and
 [RFC6073] are adequate for the proposed mechanism.

8. IANA Considerations

 IANA has set up the registry of "PW Generic Protocol Flags".  These
 are bit strings of length 16.  Bit 0 is defined in this document.
 Bits 1 through 15 are to be assigned by IANA using the "IETF Review"
 policy defined in [RFC5226].
 Any requests for allocation from this registry require a description
 of up to 65 characters.
 Initial PW Generic Protocol Flags value allocations are as follows:
 Bit Mask     Description
 ====================================================================
 0x0001    -  S-PE bypass mode                              [RFC6478]
 This document uses a new Associated Channel Type.  IANA already
 maintains the "Pseudowire Associated Channel Types" registry.  The
 value 0x0027 has been assigned with the description "PW OAM Message".
 This document uses a new Pseudowire Switching Point PE TLV Type.
 IANA already maintains the "Pseudowire Switching Point PE sub-TLV
 Type" registry.  A value of 0x07 has been assigned with the
 description "Static PW/MPLS-TP PW segment ID of last PW segment
 traversed".
 This document uses a new interface parameter type.  IANA already
 maintains the "Pseudowire Interface Parameters Sub-TLV type
 Registry".  A value of 0x18 has been assigned with the description
 "PW Generic Protocol Flags".

9. References

9.1. Normative References

 [RFC2119]    Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.
 [RFC4385]    Bryant, S., Swallow, G., Martini, L., and D. McPherson,
              "Pseudowire Emulation Edge-to-Edge (PWE3) Control Word
              for Use over an MPLS PSN", RFC 4385, February 2006.

Martini, et al. Standards Track [Page 11] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

 [RFC4447]    Martini, L., Ed., Rosen, E., El-Aawar, N., Smith, T.,
              and G. Heron, "Pseudowire Setup and Maintenance Using
              the Label Distribution Protocol (LDP)", RFC 4447, April
              2006.
 [RFC5085]    Nadeau, T., Ed., and C. Pignataro, Ed., "Pseudowire
              Virtual Circuit Connectivity Verification (VCCV): A
              Control Channel for Pseudowires", RFC 5085, December
              2007.
 [RFC5226]    Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 5226,
              May 2008.
 [RFC6073]    Martini, L., Metz, C., Nadeau, T., Bocci, M., and M.
              Aissaoui, "Segmented Pseudowire", RFC 6073, January
              2011.
 [RFC6310]    Aissaoui, M., Busschbach, P., Martini, L., Morrow, M.,
              Nadeau, T., and Y(J). Stein, "Pseudowire (PW)
              Operations, Administration, and Maintenance (OAM)
              Message Mapping", RFC 6310, July 2011.
 [RFC6426]    Gray, E., Bahadur, N., Boutros, S., and R. Aggarwal,
              "MPLS On-Demand Connectivity Verification and Route
              Tracing", RFC 6426, November 2011.

9.2. Informative References

 [REDUNDANCY] Muley, P., Ed., and M. Aissaoui, Ed., "Pseudowire
              Preferential Forwarding Status Bit", Work in Progress,
              September 2011.
 [RFC5885]    Nadeau, T., Ed., and C. Pignataro, Ed., "Bidirectional
              Forwarding Detection (BFD) for the Pseudowire Virtual
              Circuit Connectivity Verification (VCCV)", RFC 5885,
              June 2010.
 [RFC5586]    Bocci, M., Ed., Vigoureux, M., Ed., and S. Bryant, Ed.,
              "MPLS Generic Associated Channel", RFC 5586, June 2009.

Martini, et al. Standards Track [Page 12] RFC 6478 Pseudowire Status for Static Pseudowires May 2012

Authors' Addresses

 Luca Martini
 Cisco Systems, Inc.
 9155 East Nichols Avenue, Suite 400
 Englewood, CO, 80112
 EMail: lmartini@cisco.com
 George Swallow
 Cisco Systems, Inc.
 300 Beaver Brook Road
 Boxborough, Massachusetts  01719
 United States
 EMail: swallow@cisco.com
 Giles Heron
 Cisco Systems
 9-11 New Square
 Bedfont Lakes
 Feltham
 Middlesex
 TW14 8HA
 United Kingdom
 EMail: giheron@cisco.com
 Matthew Bocci
 Alcatel-Lucent
 Voyager Place
 Shoppenhangers Road
 Maidenhead
 Berks
 SL6 2PJ
 United Kingdom
 EMail: matthew.bocci@alcatel-lucent.com

Martini, et al. Standards Track [Page 13]

/data/webs/external/dokuwiki/data/pages/rfc/rfc6478.txt · Last modified: 2012/05/07 18:36 (external edit)