IP Fast Reroute Using Not-via Addresses
draft-ietf-rtgwg-ipfrr-notvia-addresses-08

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Document Type Active Internet-Draft (rtgwg WG)
Last updated 2011-12-21 (latest revision 2011-04-20)
Replaces draft-bryant-shand-ipfrr-notvia-addresses
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Network Working Group                                          S. Bryant
Internet-Draft                                                S. Previdi
Intended status: Informational                             Cisco Systems
Expires: June 23, 2012                                          M. Shand
                                                  Individual Contributor
                                                       December 21, 2011

                IP Fast Reroute Using Not-via Addresses
               draft-ietf-rtgwg-ipfrr-notvia-addresses-08

Abstract

   This draft describes a mechanism that provides fast reroute in an IP
   network through encapsulation to "not-via" addresses.  A single level
   of encapsulation is used.  The mechanism protects unicast, multicast
   and LDP traffic against link, router and shared risk group failure,
   regardless of network topology and metrics.

Status of this Memo

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   This Internet-Draft will expire on June 23, 2012.

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   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Bryant, et al.            Expires June 23, 2012                 [Page 1]
Internet-Draft   IP Fast Reroute Using Not-via Addresses   December 2011

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Overview of Not-via Repairs  . . . . . . . . . . . . . . . . .  3
     2.1.  Use of Equal Cost Multi-Path . . . . . . . . . . . . . . .  4
     2.2.  Use of LFA repairs . . . . . . . . . . . . . . . . . . . .  4
   3.  Not-via Repair Path Computation  . . . . . . . . . . . . . . .  5
     3.1.  Computing not-via repairs in routing vector protocols  . .  6
   4.  Operation of Repairs . . . . . . . . . . . . . . . . . . . . .  6
     4.1.  Node Failure . . . . . . . . . . . . . . . . . . . . . . .  6
     4.2.  Link Failure . . . . . . . . . . . . . . . . . . . . . . .  7
       4.2.1.  Loop Prevention Under Node Failure . . . . . . . . . .  7
     4.3.  Multi-homed Prefixes . . . . . . . . . . . . . . . . . . .  7
     4.4.  Installation of Repair Paths . . . . . . . . . . . . . . .  9
   5.  Compound Failures  . . . . . . . . . . . . . . . . . . . . . . 10
     5.1.  Shared Risk Link Groups  . . . . . . . . . . . . . . . . . 10
       5.1.1.  Use of LFAs with SRLGs . . . . . . . . . . . . . . . . 14
     5.2.  Local Area Networks  . . . . . . . . . . . . . . . . . . . 14
       5.2.1.  Simple LAN Repair  . . . . . . . . . . . . . . . . . . 15
       5.2.2.  LAN Component Repair . . . . . . . . . . . . . . . . . 16
       5.2.3.  LAN Repair Using Diagnostics . . . . . . . . . . . . . 17
     5.3.  Multiple Independent Failures  . . . . . . . . . . . . . . 17
       5.3.1.  Looping Repairs  . . . . . . . . . . . . . . . . . . . 18
       5.3.2.  Outline Solution . . . . . . . . . . . . . . . . . . . 19
       5.3.3.  Looping Repairs  . . . . . . . . . . . . . . . . . . . 20
         5.3.3.1.  Dropping Looping Packets . . . . . . . . . . . . . 20
         5.3.3.2.  Computing non-looping Repairs of Repairs . . . . . 21
       5.3.4.  Mixing LFAs and Not-via  . . . . . . . . . . . . . . . 23
   6.  Optimizing not-via computations using LFAs . . . . . . . . . . 24
   7.  Multicast  . . . . . . . . . . . . . . . . . . . . . . . . . . 25
   8.  Fast Reroute in an MPLS LDP Network. . . . . . . . . . . . . . 25
   9.  Encapsulation  . . . . . . . . . . . . . . . . . . . . . . . . 25
   10. Routing Extensions . . . . . . . . . . . . . . . . . . . . . . 26
   11. Incremental Deployment . . . . . . . . . . . . . . . . . . . . 26
   12. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 26
   13. Security Considerations  . . . . . . . . . . . . . . . . . . . 26
   14. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 27
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