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OSPF Two-Part Metric (RFC8042) Disclosure Number: IPCOM000248716D
Original Publication Date: 2016-Dec-01
Included in the Prior Art Database: 2016-Dec-29
Document File: 18 page(s) / 19K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

Z. Zhang: AUTHOR [+3]


With Open Shortest Path First (OSPF) [RFC2328] [RFC5340]), a Network- LSA (Link State Advertisement) is advertised to list all routers on a broadcast network. Additionally, each router on the broadcast 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.

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Internet Engineering Task Force (IETF)                          Z. Zhang Request for Comments: 8042                                       L. Wang Updates: 2328                                     Juniper Networks, Inc. Category: Standards Track                                      A. Lindem ISSN: 2070-1721                                            Cisco Systems                                                            December 2016

                           OSPF Two-Part Metric


   This document specifies an optional OSPF protocol extension to    represent router metrics in a multi-access network in two parts: the    metric from the router to the network and the metric from the network    to the router.  For such networks, the router-to-router metric for    OSPF route computation is the sum of the two parts.  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 7841.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Copyright Notice

   Copyright (c) 2016 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    ( 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.

 Zhang, et al.                Standards Track                    [Page 1]
 RFC 8042                  OSPF Two-Part Metric             December 2016

 Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2

     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3

   2.  Proposed Enhancement  . . . . . . . . . . . . . . . . . . . .   3

   3.  Specifications  . . . . . . . ....