MPLS Egress Protection Framework
draft-ietf-mpls-egress-protection-framework-03

Document Type Active Internet-Draft (mpls WG)
Last updated 2018-10-21 (latest revision 2018-10-20)
Replaces draft-shen-mpls-egress-protection-framework
Stream IETF
Intended RFC status Proposed Standard
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Internet Engineering Task Force                               Yimin Shen
Internet-Draft                                           Minto Jeyananth
Intended status: Standards Track                        Juniper Networks
Expires: April 23, 2019                                   Bruno Decraene
                                                                  Orange
                                                          Hannes Gredler
                                                             RtBrick Inc
                                                          Carsten Michel
                                                        Deutsche Telekom
                                                             Huaimo Chen
                                                          Yuanlong Jiang
                                           Huawei Technologies Co., Ltd.
                                                        October 20, 2018

                    MPLS Egress Protection Framework
             draft-ietf-mpls-egress-protection-framework-03

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 an
   egress node failure, and the egress router of the MPLS tunnel acts as
   the PLR for an 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 from an
   egress router to a 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 April 23, 2019                 [Page 1]
Internet-Draft      MPLS Egress Protection Framework        October 2018

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on April 23, 2019.

Copyright Notice

   Copyright (c) 2018 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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   (https://trustee.ietf.org/license-info) in effect on the date of
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   described in the Simplified BSD License.

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 . . . . . . . . . . . . . . . . . . .  16
     5.11. Service label distribution from egress router to
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