Extensions to OSPF for Advertising Prefix/Link Administrative Tags
draft-acee-ospf-admin-tags-06
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Active Internet-Draft (individual)
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Acee Lindem
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Peter Psenak
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2020-09-23
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Network Working Group A. Lindem, Ed.
Internet-Draft P. Psenak
Intended status: Standards Track Cisco Systems
Expires: March 27, 2021 September 23, 2020
Extensions to OSPF for Advertising Prefix/Link Administrative Tags
draft-acee-ospf-admin-tags-06
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
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
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Internet-Drafts are draft documents valid for a maximum of six months
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 27, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Lindem & Psenak Expires March 27, 2021 [Page 1]
Internet-Draft OSPF Administrative Tags September 2020
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
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described in the Simplified BSD License.
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 . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
It is useful for routers in an OSPFv2 [RFC2328] or OSPFv3 [RFC5340]
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
([RFC7684]) and OSPFv3 Extended LSA ([RFC8362]), 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 March 27, 2021 [Page 2]
Internet-Draft OSPF Administrative Tags September 2020
Throughout this document, OSPF is used when the text applies to both
OSPFv2 and OSPFv3. OSPFv2 or OSPFv3 is used when the text is
specific to one version of the OSPF protocol.
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