OSPF Stub Router Advertisement
draft-ietf-ospf-rfc3137bis-02

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Document Type Active Internet-Draft (ospf WG)
Last updated 2012-07-16
Replaces draft-retana-ospf-rfc3137bis
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Network Working Group                                          A. Retana
Internet-Draft                                       Hewlett-Packard Co.
Obsoletes: RFC3137 (if approved)                               L. Nguyen
Intended status: Informational                                  A. Zinin
Expires: January 17, 2013                            Cisco Systems, Inc.
                                                                R. White
                                                            D. McPherson
                                                          Verisign, Inc.
                                                           July 16, 2012

                     OSPF Stub Router Advertisement
                     draft-ietf-ospf-rfc3137bis-02

Abstract

   This document describes a backward-compatible technique that may be
   used by OSPF (Open Shortest Path First) implementations to advertise
   unavailability to forward transit traffic or to lower the preference
   level for the paths through such a router.

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 17, 2013.

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

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Internet-Draft       OSPF Stub Router Advertisement            July 2012

   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.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . . . 3
   3.  Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     3.1.  OSPFv3-only Solution  . . . . . . . . . . . . . . . . . . . 4
   4.  Maximum Link Metric . . . . . . . . . . . . . . . . . . . . . . 4
   5.  Deployment Considerations . . . . . . . . . . . . . . . . . . . 4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 5
   Appendix A.  Change Log . . . . . . . . . . . . . . . . . . . . . . 6
     A.1.  Changes between the -00 and -01 versions. . . . . . . . . . 6
     A.2.  Changes between the -01 and -02 versions. . . . . . . . . . 6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 6

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1.  Motivation

   In some situations, it may be advantageous to inform routers in a
   network not to use a specific router as a transit point, but still
   route to it.  Possible situations include the following:

   o  The router is in a critical condition (for example, has very high
      CPU load or does not have enough memory to store all LSAs or build
      the routing table).

   o  Graceful introduction and removal of the router to/from the
      network.

   o  Other (administrative or traffic engineering) reasons.

   Note that the solution introduced in this document does not remove
   the router from the topology view of the network (as could be done by
   just flushing that router's router-LSA), but discourages other
   routers from using it for transit routing, while still routing
   packets to the router's own IP addresses, i.e., the router is
   announced as a stub.

   It must be emphasized that the solution provides real benefits in
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