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Dynamic Placement of Multi-Segment Pseudowires
RFC 7267

Document type: RFC - Proposed Standard (June 2014; No errata)
Updates RFC 6073
Document stream: IETF
Last updated: 2014-06-17
Other versions: plain text, pdf, html

IETF State: Submitted to IESG for Publication Aug 2012
Consensus: Yes
Document shepherd: Loa Andersson
Shepherd Write-Up: Last changed 2013-10-09

IESG State: RFC 7267 (Proposed Standard)
IANA Action State: RFC-Ed-Ack
Responsible AD: Adrian Farrel
Send notices to: pwe3-chairs@tools.ietf.org, draft-ietf-pwe3-dynamic-ms-pw@tools.ietf.org, loa@pi.nu

Internet Engineering Task Force (IETF)                   L. Martini, Ed.
Request for Comments: 7267                           Cisco Systems, Inc.
Updates: 6073                                              M. Bocci, Ed.
Category: Standards Track                                  F. Balus, Ed.
ISSN: 2070-1721                                           Alcatel-Lucent
                                                               June 2014

             Dynamic Placement of Multi-Segment Pseudowires

Abstract

   RFC 5254 describes the service provider requirements for extending
   the reach of pseudowires (PWs) across multiple Packet Switched
   Network domains.  A multi-segment PW is defined as a set of two or
   more contiguous PW segments that behave and function as a single
   point-to-point PW.  This document describes extensions to the PW
   control protocol to dynamically place the segments of the multi-
   segment pseudowire among a set of Provider Edge (PE) routers.  This
   document also updates RFC 6073 by updating the value of the Length
   field of the PW Switching Point PE Sub-TLV Type 0x06 to 14.

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/rfc7267.

Martini, et al.              Standards Track                    [Page 1]
RFC 7267         Dynamic Placement of Multi-Segment PWs        June 2014

Copyright Notice

   Copyright (c) 2014 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Martini, et al.              Standards Track                    [Page 2]
RFC 7267         Dynamic Placement of Multi-Segment PWs        June 2014

Table of Contents

   1. Introduction ....................................................4
      1.1. Scope ......................................................4
      1.2. Specification of Requirements ..............................4
      1.3. Terminology ................................................4
      1.4. Architecture Overview ......................................5
   2. Applicability ...................................................6
      2.1. Changes to Existing PW Signaling ...........................6
   3. PW Layer 2 Addressing ...........................................6
      3.1. Attachment Circuit Addressing ..............................7
      3.2. S-PE Addressing ............................................8
   4. Dynamic Placement of MS-PWs .....................................8
      4.1. Pseudowire Routing Procedures ..............................8
           4.1.1. AII PW Routing Table Lookup Aggregation Rules .......9
           4.1.2. PW Static Route .....................................9
           4.1.3. Dynamic Advertisement with BGP .....................10
      4.2. LDP Signaling .............................................11
           4.2.1. Multiple Alternative Paths in PW Routing ...........13
           4.2.2. Active/Passive T-PE Election Procedure .............14
           4.2.3. Detailed Signaling Procedures ......................15

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