MPLS Egress Protection Framework
draft-shen-mpls-egress-protection-framework-06

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Last updated 2017-09-20
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Internet Engineering Task Force                               Yimin Shen
Internet-Draft                                           Minto Jeyananth
Intended status: Standards Track                        Juniper Networks
Expires: March 24, 2018                                   Bruno Decraene
                                                                  Orange
                                                          Hannes Gredler
                                                             RtBrick Inc
                                                          Carsten Michel
                                                        Deutsche Telekom
                                                             Huaimo Chen
                                                          Yuanlong Jiang
                                           Huawei Technologies Co., Ltd.
                                                      September 20, 2017

                    MPLS Egress Protection Framework
             draft-shen-mpls-egress-protection-framework-06

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

Yimin Shen, et al.       Expires March 24, 2018                 [Page 1]
Internet-Draft      MPLS Egress Protection Framework      September 2017

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on March 24, 2018.

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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 . . . . . . . . . . . .   9
     5.3.  Protector and PLR . . . . . . . . . . . . . . . . . . . .  10
     5.4.  Protected egress  . . . . . . . . . . . . . . . . . . . .  11
     5.5.  Egress-protected tunnel . . . . . . . . . . . . . . . . .  11
     5.6.  Egress-protected service  . . . . . . . . . . . . . . . .  12
     5.7.  Egress-protected service to egress-protected tunnel
           mapping . . . . . . . . . . . . . . . . . . . . . . . . .  12
     5.8.  Egress-protection bypass tunnel . . . . . . . . . . . . .  12
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