MPLS Egress Protection Framework
draft-shen-mpls-egress-protection-framework-00

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Internet Engineering Task Force                               Yimin Shen
Internet-Draft                                           Minto Jeyananth
Intended status: Informational                          Juniper Networks
Expires: August 20, 2016                               February 17, 2016

                    MPLS Egress Protection Framework
             draft-shen-mpls-egress-protection-framework-00

Abstract

   This document specifies a fast reroute framework for protecting MPLS
   tunnels and the IP/MPLS services carried by them against egress
   router failures.  The framework relies on local detection and local
   repair to be performed by the router upstream adjacent to a failure.
   The router can restore traffic in the order of tens of milliseconds,
   by rerouting it to a protector through a pre-established bypass
   tunnel.  Therefore, the 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.

Status of This Memo

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   Copyright (c) 2016 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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Yimin Shen & Minto JeyanaExpires August 20, 2016                [Page 1]
Internet-Draft      MPLS Egress Protection Framework       February 2016

   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Specification of Requirements . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Theory of Operation . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Egress failure  . . . . . . . . . . . . . . . . . . . . .   5
     5.2.  Protector and PLR . . . . . . . . . . . . . . . . . . . .   6
     5.3.  Protected egress  . . . . . . . . . . . . . . . . . . . .   6
     5.4.  Egress-protected tunnel . . . . . . . . . . . . . . . . .   7
     5.5.  Egress-protected service  . . . . . . . . . . . . . . . .   7
     5.6.  Egress-protected service to egress-protected tunnel
           mapping . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.7.  Egress-protection bypass tunnel . . . . . . . . . . . . .   7
     5.8.  Context ID, context label, and context based forwarding .   8
     5.9.  IGP advertisement and path computation for context ID . .   9
     5.10. Egress-protection bypass tunnel establishment . . . . . .  10
     5.11. Local Repair on PLR . . . . . . . . . . . . . . . . . . .  11
     5.12. Label distribution from egress router to protector  . . .  11
   6.  Global repair . . . . . . . . . . . . . . . . . . . . . . . .  12
   7.  Example:  Layer-3 VPN egress protection . . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     11.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   In MPLS networks, LSPs (label switched paths) are widely use as
   transport tunnels to carry IP and MPLS services across MPLS domains.
   Examples of MPLS services are layer-2 VPNs, layer-3 VPNs, etc.
   Particularly, at the egress router of a tunnel, packets of an IP
   service are forwarded to service destination based on IP header, and
   packets of an MPLS service are forwarded to service destination based
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