OSPF Prefix Originator Extensions
draft-ietf-lsr-ospf-prefix-originator-06
LSR Working Group A. Wang
Internet-Draft China Telecom
Intended status: Standards Track A. Lindem
Expires: January 1, 2021 Cisco Systems
J. Dong
Huawei Technologies
P. Psenak
K. Talaulikar
Cisco Systems
June 30, 2020
OSPF Prefix Originator Extensions
draft-ietf-lsr-ospf-prefix-originator-06
Abstract
This document defines OSPF extensions to include information
associated with the node originating a prefix along with the prefix
advertisement.
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Internet-Draft OSPF Prefix Originator Extensions June 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Protocol Extensions . . . . . . . . . . . . . . . . . . . . . 3
2.1. Prefix Source Router-ID Sub-TLV . . . . . . . . . . . . . 4
2.2. Prefix Originator Sub-TLV . . . . . . . . . . . . . . . . 4
3. Elements of Procedure . . . . . . . . . . . . . . . . . . . . 5
4. Security Considerations . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
6. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 7
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . 8
Appendix A. Inter-Area Topology Retrieval Process . . . . . . . 9
Appendix B. Special Considerations on Inter-Area Topology
Retrieval . . . . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
Prefix attributes are advertised in OSPFv2 [RFC2328] using the
Extended Prefix Opaque Link State Advertisement (LSA) [RFC7684] and
in OSPFv3 [RFC5340] using the various Extended Prefix LSA types
[RFC8362].
The identification of the originating router for a prefix in OSPF
varies by the type of the prefix and is currently not always
possible. For intra-area prefixes, the originating router is
identified by the advertising Router ID field of the area-scoped LSA
used for those prefix advertisements. However, for the inter-area
prefixes advertised by the Area Border Router (ABR), the advertising
Router ID field of their area-scoped LSAs is set to the ABR itself
and the information about the router originating the prefix
advertisement is lost in this process of prefix propagation across
areas. For Autonomous System (AS) external prefixes, the originating
router may be considered as the Autonomous System Border Router
(ASBR) and is identified by the advertising Router ID field of the
AS-scoped LSA used. However, the actual originating router for the
prefix may be a remote router outside the OSPF domain. Similarly,
when an ABR performs translation of Not-So-Stubby Area (NSSA)
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