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IS-IS Multi-Instance
RFC 6822

Internet Engineering Task Force (IETF)                   S. Previdi, Ed.
Request for Comments: 6822                                   L. Ginsberg
Category: Standards Track                                  Cisco Systems
ISSN: 2070-1721                                                 M. Shand

                                                                  A. Roy
                                                                 D. Ward
                                                           Cisco Systems
                                                           December 2012

                          IS-IS Multi-Instance

Abstract

   This document describes a mechanism that allows a single router to
   share one or more circuits among multiple Intermediate System to
   Intermediate System (IS-IS) routing protocol instances.

   Multiple instances allow the isolation of resources associated with
   each instance.  Routers will form instance-specific adjacencies.
   Each instance can support multiple topologies.  Each topology has a
   unique Link State Database (LSDB).  Each Protocol Data Unit (PDU)
   will contain a new Type-Length-Value (TLV) identifying the instance
   and the topology (or topologies) to which the PDU belongs.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6822.

Previdi, et al.              Standards Track                    [Page 1]
RFC 6822                  IS-IS Multi-Instance             December 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
   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
   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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Previdi, et al.              Standards Track                    [Page 2]
RFC 6822                  IS-IS Multi-Instance             December 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
   2.  Elements Of Procedure  . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Instance Identifier TLV  . . . . . . . . . . . . . . . . .  5
     2.2.  Instance Membership  . . . . . . . . . . . . . . . . . . .  6
     2.3.  Use of Authentication  . . . . . . . . . . . . . . . . . .  6
     2.4.  Adjacency Establishment  . . . . . . . . . . . . . . . . .  6
       2.4.1.  Point-to-Point Adjacencies . . . . . . . . . . . . . .  7
       2.4.2.  Multi-Access Adjacencies . . . . . . . . . . . . . . .  7
     2.5.  Update Process Operation . . . . . . . . . . . . . . . . .  7
       2.5.1.  Update Process Operation on Point-to-Point Circuits  .  7
       2.5.2.  Update Process Operation on Broadcast Circuits . . . .  7
     2.6.  Interoperability Considerations  . . . . . . . . . . . . .  8
       2.6.1.  Interoperability Issues on Broadcast Circuits  . . . .  8
       2.6.2.  Interoperability Using Point-to-Point Circuits . . . .  9
   3.  Usage Guidelines . . . . . . . . . . . . . . . . . . . . . . .  9
     3.1.  One-to-One Mapping between Topologies and Instances  . . . 10

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