OSPF Hybrid Broadcast and P2MP Interface Type
draft-ietf-ospf-hybrid-bcast-and-p2mp-00

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Last updated 2011-10-05
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Network Working Group                                           N. Sheth
Internet-Draft                                                   L. Wang
Intended status: Standards Track                                J. Zhang
Expires: April 7, 2012                                  Juniper Networks
                                                         October 5, 2011

             OSPF Hybrid Broadcast and P2MP Interface Type
              draft-ietf-ospf-hybrid-bcast-and-p2mp-00.txt

Abstract

   This document describes a mechanism to model a broadcast network as a
   hybrid of broadcast and point-to-multipoint networks for purposes of
   OSPF operation.  Neighbor discovery and maintenance as well as LSA
   database synchronization are performed using the broadcast model, but
   the network is represented using the point-to-multipoint model in the
   router LSAs of the routers connected to it.  This allows an accurate
   representation of the cost of communication between different routers
   on the network, while maintaining the network efficiency of broadcast
   operation.  This approach is relatively simple and requires minimal
   changes to OSPF.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 7, 2012.

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   Copyright (c) 2011 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
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Motivation . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Operation  . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.  Interface Parameters . . . . . . . . . . . . . . . . . . .  6
     3.2.  Neighbor Data Structure  . . . . . . . . . . . . . . . . .  6
     3.3.  Neighbor Discovery and Maintenance . . . . . . . . . . . .  6
     3.4.  Database Synchronization . . . . . . . . . . . . . . . . .  6
     3.5.  Generating Network LSAs  . . . . . . . . . . . . . . . . .  6
     3.6.  Generating Router and Intra-Area-Prefix-LSAs . . . . . . .  7
       3.6.1.  Stub Links in OSPFv2 Router LSA  . . . . . . . . . . .  7
       3.6.2.  OSPFv3 Intra-Area-Prefix-LSA . . . . . . . . . . . . .  7
     3.7.  Next-Hop Calculation . . . . . . . . . . . . . . . . . . .  7
     3.8.  Graceful Restart . . . . . . . . . . . . . . . . . . . . .  8
   4.  Compatibility Considerations . . . . . . . . . . . . . . . . .  9
   5.  Scalability and Deployment Considerations  . . . . . . . . . . 10
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
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