IS-IS Routing with Reverse Metric
draft-ietf-isis-reverse-metric-16

Document Type Active Internet-Draft (lsr WG)
Last updated 2018-11-04
Replaces draft-amante-isis-reverse-metric
Stream IETF
Intended RFC status Proposed Standard
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Reviews SECDIR will not review this version
Stream WG state Submitted to IESG for Publication
Document shepherd Christian Hopps
Shepherd write-up Show (last changed 2018-07-06)
IESG IESG state IESG Evaluation
Consensus Boilerplate Yes
Telechat date On agenda of 2018-11-21 IESG telechat
Needs 9 more YES or NO OBJECTION positions to pass.
Responsible AD Alvaro Retana
Send notices to Christian Hopps <chopps@chopps.org>, aretana.ietf@gmail.com
IANA IANA review state Version Changed - Review Needed
IANA action state None
Networking Working Group                                         N. Shen
Internet-Draft                                             Cisco Systems
Intended status: Standards Track                               S. Amante
Expires: May 8, 2019                                         Apple, Inc.
                                                          M. Abrahamsson
                                                        T-Systems Nordic
                                                        November 4, 2018

                   IS-IS Routing with Reverse Metric
                   draft-ietf-isis-reverse-metric-16

Abstract

   This document describes a mechanism to allow IS-IS routing to quickly
   and accurately shift traffic away from either a point-to-point or
   multi-access LAN interface during network maintenance or other
   operational events.  This is accomplished by signaling adjacent IS-IS
   neighbors with a higher reverse metric, i.e., the metric towards the
   signaling IS-IS router.

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 May 8, 2019.

Copyright Notice

   Copyright (c) 2018 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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

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Internet-Draft            IS-IS Reverse Metric             November 2018

   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Node and Link Isolation . . . . . . . . . . . . . . . . .   3
     1.2.  Distributed Forwarding Planes . . . . . . . . . . . . . .   3
     1.3.  Spine-Leaf Applications . . . . . . . . . . . . . . . . .   3
     1.4.  LDP IGP Synchronization . . . . . . . . . . . . . . . . .   3
     1.5.  IS-IS Reverse Metric  . . . . . . . . . . . . . . . . . .   4
     1.6.  Specification of Requirements . . . . . . . . . . . . . .   4
   2.  IS-IS Reverse Metric TLV  . . . . . . . . . . . . . . . . . .   4
   3.  Elements of Procedure . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Processing Changes to Default Metric  . . . . . . . . . .   6
     3.2.  Multi-Topology IS-IS Support on Point-to-point links  . .   7
     3.3.  Multi-Access LAN Procedures . . . . . . . . . . . . . . .   7
     3.4.  LDP/IGP Synchronization on LANs . . . . . . . . . . . . .   8
     3.5.  Operational Guidelines  . . . . . . . . . . . . . . . . .   9
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Appendix A.  Node Isolation Challenges  . . . . . . . . . . . . .  12
   Appendix B.  Link Isolation Challenges  . . . . . . . . . . . . .  13
   Appendix C.  Contributors' Addresses  . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   The IS-IS [ISO10589] 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 the issues and a mechanism for mitigating them.

   This document defines the IS-IS "Reverse Metric" mechanism that
   allows an IS-IS node to send a "Reverse Metric" TLV through the IS-IS
   IIH PDU to the neighbor or pseudo-node to adjust the routing metric
   on the inbound direction.

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