IS-IS Reverse Metric TLV for Network Maintenance Events
draft-ietf-isis-reverse-metric-02

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Document Type Active Internet-Draft (isis WG)
Last updated 2013-01-14
Replaces draft-amante-isis-reverse-metric
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IS-IS Working Group                                              N. Shen
Internet-Draft                                                     T. Li
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: July 18, 2013                                         S. Amante
                                                  Level 3 Communications
                                                          M. Abrahamsson
                                                                   Tele2
                                                        January 14, 2013

        IS-IS Reverse Metric TLV for Network Maintenance Events
                   draft-ietf-isis-reverse-metric-02

Abstract

   This document describes an improved IS-IS neighbor management scheme
   which can be used to enhance network performance by allowing
   operators to quickly and accurately shift traffic away from a point-
   to-point or multi-access LAN interface by allowing one IS-IS router
   to signal to a second, adjacent IS-IS neighbor to adjust its IS-IS
   metric that should be used to temporarily reach the first IS-IS
   router during network maintenance events.

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 http://datatracker.ietf.org/drafts/current/.

   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
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on July 18, 2013.

Copyright Notice

   Copyright (c) 2013 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of

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   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Node Isolation Challenges  . . . . . . . . . . . . . . . .  3
     1.2.  Link Isolation Challenges  . . . . . . . . . . . . . . . .  3
     1.3.  IS-IS Reverse Metric . . . . . . . . . . . . . . . . . . .  4
     1.4.  Specification of Requirements  . . . . . . . . . . . . . .  5

   2.  IS-IS Reverse Metric TLV . . . . . . . . . . . . . . . . . . .  5

   3.  Elements of Procedure  . . . . . . . . . . . . . . . . . . . .  6
     3.1.  Processing Changes to Default Metric . . . . . . . . . . .  6
     3.2.  Processing Changes to Default Metric for
           Multi-Topology IS-IS . . . . . . . . . . . . . . . . . . .  8
     3.3.  Multi-Access LAN Procedures  . . . . . . . . . . . . . . .  8
     3.4.  Order of Operations  . . . . . . . . . . . . . . . . . . . 10
     3.5.  Operational Guidelines . . . . . . . . . . . . . . . . . . 10

   4.  Reverse Metric TLV Example Use Cases . . . . . . . . . . . . . 11

   5.  Operational Considerations . . . . . . . . . . . . . . . . . . 11

   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 12

   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12

   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 12

   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 12
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 13

   Appendix A.  Use of Reverse Metric for LDP/IGP Synchronization
                on LAN's  . . . . . . . . . . . . . . . . . . . . . . 13

   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14

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1.  Introduction

   The IS-IS [ISO 10589] routing protocol has been widely used in
   Internet Service Provider IP/MPLS networks.  Operational experience
   with the protocol, combined with ever increasing requirements for
   lossless operations have demonstrated some operational issues.  This
   document describes one issue and a new mechanism for improving it.
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