OSPF Prefix Originator Extensions
draft-ietf-lsr-ospf-prefix-originator-07
LSR Working Group A. Wang
Internet-Draft China Telecom
Intended status: Standards Track A. Lindem
Expires: April 23, 2021 Cisco Systems
J. Dong
Huawei Technologies
P. Psenak
K. Talaulikar
Cisco Systems
October 20, 2020
OSPF Prefix Originator Extensions
draft-ietf-lsr-ospf-prefix-originator-07
Abstract
This document defines OSPF extensions to include information
associated with the node originating a prefix along with the prefix
advertisement.
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 April 23, 2021.
Copyright Notice
Copyright (c) 2020 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
Wang, et al. Expires April 23, 2021 [Page 1]
Internet-Draft OSPF Prefix Originator Extensions October 2020
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. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Protocol Extensions . . . . . . . . . . . . . . . . . . . . . 3
2.1. Prefix Source Router-ID Sub-TLV . . . . . . . . . . . . . 3
2.2. Prefix Originator Sub-TLV . . . . . . . . . . . . . . . . 4
3. Elements of Procedure . . . . . . . . . . . . . . . . . . . . 5
4. Security Considerations . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
6. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 7
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
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)
[RFC3101] LSAs to AS-external LSAs, the information associated with
the NSSA ASBR (or the router outside the OSPF domain) is not conveyed
across the OSPF domain.
Wang, et al. Expires April 23, 2021 [Page 2]
Show full document text