MPLS Egress Protection Framework
draft-shen-mpls-egress-protection-framework-07

Document Type Active Internet-Draft (candidate for mpls WG)
Last updated 2017-12-10 (latest revision 2017-11-14)
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Internet Engineering Task Force                               Yimin Shen
Internet-Draft                                           Minto Jeyananth
Intended status: Standards Track                        Juniper Networks
Expires: May 18, 2018                                     Bruno Decraene
                                                                  Orange
                                                          Hannes Gredler
                                                             RtBrick Inc
                                                          Carsten Michel
                                                        Deutsche Telekom
                                                             Huaimo Chen
                                                          Yuanlong Jiang
                                           Huawei Technologies Co., Ltd.
                                                       November 14, 2017

                    MPLS Egress Protection Framework
             draft-shen-mpls-egress-protection-framework-07

Abstract

   This document specifies a fast reroute framework for protecting IP/
   MPLS services and MPLS transport tunnels against egress node and
   egress link failures.  In this framework, the penultimate-hop router
   of an MPLS tunnel acts as the point of local repair (PLR) for egress
   node failure, and the egress router of the MPLS tunnel acts as the
   PLR for egress link failure.  Each of them pre-establishes a bypass
   tunnel to a protector.  Upon an egress node or link failure, the
   corresponding PLR performs local failure detection and local repair,
   by rerouting packets over the corresponding bypass tunnel.  The
   protector in turn performs context label switching or context IP
   forwarding to send the packets to the ultimate service
   destination(s).  This mechanism can be used to reduce traffic loss
   before global repair reacts to the failure and control plane
   protocols converge on the topology changes due to the failure.  The
   framework is applicable to all types of IP/MPLS services and MPLS
   tunnels.  Under the framework, service protocol extensions may be
   further specified to support service label distribution to the
   protector.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

Yimin Shen, et al.        Expires May 18, 2018                  [Page 1]
Internet-Draft      MPLS Egress Protection Framework       November 2017

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   This Internet-Draft will expire on May 18, 2018.

Copyright Notice

   Copyright (c) 2017 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Specification of Requirements . . . . . . . . . . . . . . . .   5
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Egress node protection  . . . . . . . . . . . . . . . . . . .   8
     5.1.  Reference topology  . . . . . . . . . . . . . . . . . . .   8
     5.2.  Egress node failure and detection . . . . . . . . . . . .   8
     5.3.  Protector and PLR . . . . . . . . . . . . . . . . . . . .   9
     5.4.  Protected egress  . . . . . . . . . . . . . . . . . . . .  10
     5.5.  Egress-protected tunnel and service . . . . . . . . . . .  11
     5.6.  Egress-protection bypass tunnel . . . . . . . . . . . . .  11
     5.7.  Context ID, context label, and context based forwarding .  12
     5.8.  Advertisement and path resolution for context ID  . . . .  14
     5.9.  Egress-protection bypass tunnel establishment . . . . . .  15
     5.10. Local repair on PLR . . . . . . . . . . . . . . . . . . .  15
     5.11. Service label distribution from egress router to
           protector . . . . . . . . . . . . . . . . . . . . . . . .  16
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