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OSPFv2 Multi-Instance Extensions
RFC 6549

Internet Engineering Task Force (IETF)                         A. Lindem
Request for Comments: 6549                                      Ericsson
Updates: 2328                                                     A. Roy
Category: Standards Track                                   S. Mirtorabi
ISSN: 2070-1721                                            Cisco Systems
                                                              March 2012

                    OSPFv2 Multi-Instance Extensions

Abstract

   OSPFv3 includes a mechanism to support multiple instances of the
   protocol running on the same interface.  OSPFv2 can utilize such a
   mechanism in order to support multiple routing domains on the same
   subnet.

   This document defines the OSPFv2 Instance ID to enable separate
   OSPFv2 protocol instances on the same interface.  Unlike OSPFv3 where
   the Instance ID can be used for multiple purposes, such as putting
   the same interface in multiple areas, the OSPFv2 Instance ID is
   reserved for identifying protocol instances.

   This document updates RFC 2328.

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/rfc6549.

Lindem, et al.               Standards Track                    [Page 1]
RFC 6549            OSPFv2 Multi-Instance Extensions          March 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.

Table of Contents

   1. Introduction ....................................................2
      1.1. Requirements Notation ......................................3
   2. OSPFv2 Instance Packet Encoding .................................3
   3. OSPFv2 Interface Instance ID ....................................4
      3.1. Sending and Receiving OSPFv2 Packets .......................4
      3.2. Interface Instance ID Values ...............................4
   4. State Sharing Optimizations between OSPFv2 Instances ............5
   5. OSPFv2 Authentication Impacts ...................................5
   6. Backward Compatibility and Deployment Considerations ............5
   7. Security Considerations .........................................6
   8. IANA Considerations .............................................6
   9. References ......................................................7
      9.1. Normative References .......................................7
      9.2. Informative References .....................................7
   Appendix A. Acknowledgments.... ....................................8

1.  Introduction

   OSPFv3 [OSPFV3] includes a mechanism to support multiple instances of
   a protocol running on the same interface.  OSPFv2 [OSPFV2] can
   utilize such a mechanism in order to support multiple routing domains
   on the same subnet.

   This document defines the OSPFv2 Instance ID to enable separate
   OSPFv2 protocol instances on the same interface.  Unlike OSPFv3 where
   the Instance ID can be used for multiple purposes, such as putting
   the same interface in multiple areas, the OSPFv2 Instance ID is
   reserved for identifying protocol instances.

Lindem, et al.               Standards Track                    [Page 2]
RFC 6549            OSPFv2 Multi-Instance Extensions          March 2012

1.1.  Requirements Notation

   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 [RFC-KEYWORDS].

2.  OSPFv2 Instance Packet Encoding

[include full document text]