Host Router Support for OSPFv2
draft-ietf-ospf-ospfv2-hbit-07

Document Type Active Internet-Draft (lsr WG)
Last updated 2019-05-19
Replaces draft-keyupate-ospf-ospfv2-hbit
Stream IETF
Intended RFC status Proposed Standard
Formats plain text pdf html bibtex
Stream WG state Submitted to IESG for Publication
Document shepherd Yingzhen Qu
Shepherd write-up Show (last changed 2018-12-05)
IESG IESG state AD Evaluation::Revised I-D Needed
Consensus Boilerplate Yes
Telechat date
Responsible AD Alvaro Retana
Send notices to Yingzhen Qu <yingzhen.ietf@gmail.com>, aretana.ietf@gmail.com
OSPF                                                            K. Patel
Internet-Draft                                                    Arrcus
Updates: 2328 (if approved)                            P. Pillay-Esnault
Intended status: Standards Track                     Huawei Technologies
Expires: November 20, 2019                                   M. Bhardwaj
                                                            S. Bayraktar
                                                           Cisco Systems
                                                            May 19, 2019

                     Host Router Support for OSPFv2
                     draft-ietf-ospf-ospfv2-hbit-07

Abstract

   The OSPFv2 specifies an SPF algorithm that identifies transit
   vertices based on their adjacencies.  Therefore, OSPFv2 does not have
   a mechanism to prevent traffic transiting a participating node if it
   is a transit vertex in the only existing or shortest path to the
   destination.  The use of metrics to make the node undesirable can
   only help to repel traffic if an alternative better route exists.
   This document defines the Host-bit functionality to prevent other
   OSPFv2 routers from using the router for transit traffic in OSPFv2
   routing domains.  This document updates the [RFC2328] by assigning a
   new bit (Host-bit) in the OSPF Router-LSA bit registry.  If the Host-
   bit is set, the calculation of the shortest-path tree for an area, as
   described in [RFC2328], is modified by including a new check to
   verify that transit vertices have the Host-bit clear.

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 https://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 November 20, 2019.

Patel, et al.           Expires November 20, 2019               [Page 1]
Internet-Draft                                                  May 2019

Copyright Notice

   Copyright (c) 2019 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
   (https://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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Host-bit Support  . . . . . . . . . . . . . . . . . . . . . .   3
   4.  SPF Modifications . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Auto Discovery and Backward Compatibility . . . . . . . . . .   6
   6.  OSPF AS-External-LSAs/NSSA LSAs with Type 2 Metrics . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   7
     10.2.  Informative References . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The OSPFv2 specifies an SPF algorithm that identifies transit
   vertices based on their adjacencies.  Therefore, OSPFv2 does not have
Show full document text