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

Document Type Active Internet-Draft (mpls WG)
Last updated 2019-11-13 (latest revision 2019-07-31)
Replaces draft-shen-mpls-egress-protection-framework
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Internet Engineering Task Force                               Yimin Shen
Internet-Draft                                           Minto Jeyananth
Intended status: Standards Track                        Juniper Networks
Expires: February 1, 2020                                 Bruno Decraene
                                                                  Orange
                                                          Hannes Gredler
                                                             RtBrick Inc
                                                          Carsten Michel
                                                        Deutsche Telekom
                                                             Huaimo Chen
                                           Huawei Technologies Co., Ltd.
                                                           July 31, 2019

                    MPLS Egress Protection Framework
             draft-ietf-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.  For each type of egress failure, it defines
   the roles of point of local repair (PLR), protector, and backup
   egress router, and the procedures of establishing a bypass tunnel
   from a PLR to a protector.  It describes the behaviors of these
   routers in handling an egress failure, including local repair on the
   PLR, and context-based forwarding on the protector.  The framework
   can be used to develop egress protection mechanisms to reduce traffic
   loss before global repair reacts to an egress failure and control
   plane protocols converge on the topology changes due to the egress
   failure.

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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   This Internet-Draft will expire on February 1, 2020.

Yimin Shen, et al.      Expires February 1, 2020                [Page 1]
Internet-Draft      MPLS Egress Protection Framework           July 2019

Copyright Notice

   Copyright (c) 2019 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  . . . .  13
     5.9.  Egress-protection bypass tunnel establishment . . . . . .  15
     5.10. Local repair on PLR . . . . . . . . . . . . . . . . . . .  16
     5.11. Service label distribution from egress router to
           protector . . . . . . . . . . . . . . . . . . . . . . . .  16
     5.12. Centralized protector mode  . . . . . . . . . . . . . . .  17
   6.  Egress link protection  . . . . . . . . . . . . . . . . . . .  19
   7.  Global repair . . . . . . . . . . . . . . . . . . . . . . . .  22
   8.  Operational Considerations  . . . . . . . . . . . . . . . . .  22
   9.  General context-based forwarding  . . . . . . . . . . . . . .  23
   10. Example: Layer-3 VPN egress protection  . . . . . . . . . . .  23
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