Extensions to OSPF for Advertising Prefix/Link Administrative Tags
draft-acee-lsr-ospf-admin-tags-00

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Last updated 2018-07-23
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Network Working Group                                     A. Lindem, Ed.
Internet-Draft                                                 P. Psenak
Intended status: Standards Track                           Cisco Systems
Expires: January 24, 2019                                  July 23, 2018

   Extensions to OSPF for Advertising Prefix/Link Administrative Tags
                 draft-acee-lsr-ospf-admin-tags-00.txt

Abstract

   It is useful for routers in an OSPFv2 or OSPFv3 routing domain to be
   able to associate tags with prefixes and links.  Previously, OSPFv2
   and OSPFv3 were relegated to a single tag for AS External and Not-So-
   Stubby-Area (NSSA) prefixes.  With the flexible encodings provided by
   OSPFv2 Prefix/Link Attribute Advertisement and OSPFv3 Extended LSAs,
   multiple administrative tags may advertised for all types of prefixes
   and links.  These administrative tags can be used for many
   applications including route redistribution policy, selective prefix
   prioritization, selective IP Fast-ReRoute (IPFRR) prefix protection,
   and many others.

   The ISIS protocol supports a similar mechanism that is described in
   RFC 5130.

Status of This Memo

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   This Internet-Draft will expire on January 24, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Lindem & Psenak         Expires January 24, 2019                [Page 1]
Internet-Draft          OSPF Administrative Tags               July 2018

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements notation . . . . . . . . . . . . . . . . . .   3
   2.  32-Bit Administrative Tag Sub-TLV . . . . . . . . . . . . . .   3
   3.  Administrative Tag Applicability  . . . . . . . . . . . . . .   4
   4.  Protocol Operation  . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Equal-Cost Multipath Applicability  . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Appendix A.  64-Bit Administrative Tag Sub-TLV  . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   It is useful for routers in an OSPFv2 [OSPF] or OSPFv3 [OSPF] routing
   domain to be able to associate tags with prefixes and links.
   Previously, OSPFv3 and OSPFv3 were relegated to a single tag for AS
   External and Not-So-Stubby-Area (NSSA) prefixes.  With the flexible
   encodings provided by OSPFv2 Prefix/Link Attribute Advertisement
   ([OSPFV2-PREFIX-LINK]) and OSPFv3 Extended LSA
   ([OSPFV3-EXTENDED-LSA]), multiple administrative tags may be
   advertised for all types of prefixes and links.  These administrative
   tags can be used many applications including (but not limited to):

   1.  Controlling which routes are redistributed into other protocols
       for readvertisement.

   2.  Prioritizing selected prefixes for faster convergence and
       installation in the forwarding plane.

   3.  Identifying selected prefixes for Loop-Free Alternative (LFA)
       protection.

Lindem & Psenak         Expires January 24, 2019                [Page 2]
Internet-Draft          OSPF Administrative Tags               July 2018

   Throughout this document, OSPF is used when the text applies to both
   OSPFv2 and OSPFv3.  OSPFv2 or OSPFv3 is used when the text is
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