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