IP Fast Reroute Using Not-via Addresses
draft-ietf-rtgwg-ipfrr-notvia-addresses-09

The information below is for an old version of the document
Document Type Active Internet-Draft (rtgwg WG)
Last updated 2012-10-16 (latest revision 2012-06-09)
Replaces draft-bryant-shand-ipfrr-notvia-addresses
Stream IETF
Intended RFC status Informational
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Alvaro Retana
IESG IESG state AD Evaluation::Revised I-D Needed
Consensus Boilerplate Unknown
Telechat date
Responsible AD Adrian Farrel
IESG note Alvaro Retana (aretana@cisco.com) is the Document Shepherd.
Send notices to rtgwg-chairs@tools.ietf.org, draft-ietf-rtgwg-ipfrr-notvia-addresses@tools.ietf.org
Network Working Group                                          S. Bryant
Internet-Draft                                                S. Previdi
Intended status: Informational                             Cisco Systems
Expires: December 11, 2012                                      M. Shand
                                                  Individual Contributor
                                                            June 9, 2012

                IP Fast Reroute Using Not-via Addresses
               draft-ietf-rtgwg-ipfrr-notvia-addresses-09

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.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC2119 [RFC2119].

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
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   This Internet-Draft will expire on December 11, 2012.

Copyright Notice

   Copyright (c) 2012 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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   Provisions Relating to IETF Documents
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Internet-Draft   IP Fast Reroute Using Not-via Addresses       June 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Overview of Not-via Repairs  . . . . . . . . . . . . . . . . .  4
     2.1.  Use of Equal Cost Multi-Path . . . . . . . . . . . . . . .  5
     2.2.  Use of LFA repairs . . . . . . . . . . . . . . . . . . . .  5
   3.  Not-via Repair Path Computation  . . . . . . . . . . . . . . .  6
     3.1.  Computing not-via repairs in distance and path vector
           routing protocols  . . . . . . . . . . . . . . . . . . . .  7
   4.  Operation of Repairs . . . . . . . . . . . . . . . . . . . . .  7
     4.1.  Node Failure . . . . . . . . . . . . . . . . . . . . . . .  8
     4.2.  Link Failure . . . . . . . . . . . . . . . . . . . . . . .  8
       4.2.1.  Loop Prevention Under Node Failure . . . . . . . . . .  8
     4.3.  Multi-homed Prefixes . . . . . . . . . . . . . . . . . . .  9
     4.4.  Installation of Repair Paths . . . . . . . . . . . . . . . 10
   5.  Compound Failures  . . . . . . . . . . . . . . . . . . . . . . 11
     5.1.  Shared Risk Link Groups  . . . . . . . . . . . . . . . . . 11
     5.2.  Local Area Networks  . . . . . . . . . . . . . . . . . . . 16
       5.2.1.  Simple LAN Repair  . . . . . . . . . . . . . . . . . . 17
       5.2.2.  LAN Component Repair . . . . . . . . . . . . . . . . . 17
       5.2.3.  LAN Repair Using Diagnostics . . . . . . . . . . . . . 18
     5.3.  Multiple Independent Failures  . . . . . . . . . . . . . . 18
       5.3.1.  Looping Repairs  . . . . . . . . . . . . . . . . . . . 19
       5.3.2.  Outline Solution . . . . . . . . . . . . . . . . . . . 20
       5.3.3.  Looping Repairs  . . . . . . . . . . . . . . . . . . . 21
         5.3.3.1.  Dropping Looping Packets . . . . . . . . . . . . . 21
         5.3.3.2.  Computing non-looping Repairs of Repairs . . . . . 22
       5.3.4.  Mixing LFAs and Not-via  . . . . . . . . . . . . . . . 24
   6.  Optimizing not-via computations using LFAs . . . . . . . . . . 25
   7.  Multicast  . . . . . . . . . . . . . . . . . . . . . . . . . . 26
   8.  Fast Reroute in an MPLS LDP Network. . . . . . . . . . . . . . 26
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