OSPF Two-part Metric
draft-ietf-ospf-two-part-metric-01

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Document Type Active Internet-Draft (ospf WG)
Last updated 2015-07-26
Replaces draft-zzhang-ospf-two-part-metric
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Open Shortest Path First                                        Z. Zhang
Internet-Draft                                                   L. Wang
Updates: 2328, 5340 (if approved)                 Juniper Networks, Inc.
Intended status: Standards Track                               A. Lindem
Expires: January 26, 2016                                  Cisco Systems
                                                               D. Dubois
                                                    General Dynamics C4S
                                                                V. Julka
                                                             T. McMillan
                                             L3 Communications, Linkabit
                                                           July 25, 2015

                          OSPF Two-part Metric
                 draft-ietf-ospf-two-part-metric-01.txt

Abstract

   This document specifies an optional extension to the OSPF protocol,
   to represent the metric on a multi-access network as two parts: the
   metric from a router to the network, and the metric from the network
   to the router.  The router to router metric would be the sum of the
   two.

Requirements Language

   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 RFC2119.

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 January 26, 2016.

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Copyright Notice

   Copyright (c) 2015 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
   2.  Proposed Enhancement  . . . . . . . . . . . . . . . . . . . .   3
   3.  Speficications  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Router Interface Parameters . . . . . . . . . . . . . . .   4
     3.2.  Advertising Network-to-Router metric in OSPFv2  . . . . .   4
     3.3.  Advertising Network-to-Router metric in OSPFv3  . . . . .   5
     3.4.  SPF Calculation . . . . . . . . . . . . . . . . . . . . .   5
     3.5.  Backward Compatibility  . . . . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   For a broadcast network, a Network-LSA is advertised to list all
   routers on the network, and each router on the network includes a
   link in its Router-LSA to describe its connection to the network.
   The link in the Router-LSA includes a metric but the listed routers
   in the Network LSA do not include a metric.  This is based on the
   assumption that from a particular router, all others on the same
   network can be reached with the same metric.

   With some broadcast networks, different routers can be reached with
   different metrics.  RFC 6845 extends the OSPF protocol with a hybrid
   interface type for that kind of broadcast network, where no Network
   LSA is advertised and Router-LSAs simply include p2p links to all
   routers on the same network with individual metrics.  Broadcast

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