OSPF Extensions for Segment Routing
draft-ietf-ospf-segment-routing-extensions-19
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2017-10-16
(latest revision 2017-08-25)
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draft-psenak-ospf-segment-routing-extensions
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Acee Lindem
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Alia Atlas
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Open Shortest Path First IGP P. Psenak, Ed.
Internet-Draft S. Previdi, Ed.
Intended status: Standards Track C. Filsfils
Expires: February 26, 2018 Cisco Systems, Inc.
H. Gredler
RtBrick Inc.
R. Shakir
Google, Inc.
W. Henderickx
Nokia
J. Tantsura
Individual
August 25, 2017
OSPF Extensions for Segment Routing
draft-ietf-ospf-segment-routing-extensions-19
Abstract
Segment Routing (SR) allows a flexible definition of end-to-end paths
within IGP topologies by encoding paths as sequences of topological
sub-paths, called "segments". These segments are advertised by the
link-state routing protocols (IS-IS and OSPF).
This draft describes the OSPF extensions required for Segment
Routing.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
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 http://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."
Psenak, et al. Expires February 26, 2018 [Page 1]
Internet-Draft OSPF Extensions for Segment Routing August 2017
This Internet-Draft will expire on February 26, 2018.
Copyright Notice
Copyright (c) 2017 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
(http://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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Segment Routing Identifiers . . . . . . . . . . . . . . . . . 3
2.1. SID/Label Sub-TLV . . . . . . . . . . . . . . . . . . . . 3
3. Segment Routing Capabilities . . . . . . . . . . . . . . . . 4
3.1. SR-Algorithm TLV . . . . . . . . . . . . . . . . . . . . 4
3.2. SID/Label Range TLV . . . . . . . . . . . . . . . . . . . 6
3.3. SR Local Block TLV . . . . . . . . . . . . . . . . . . . 8
3.4. SRMS Preference TLV . . . . . . . . . . . . . . . . . . . 10
4. OSPF Extended Prefix Range TLV . . . . . . . . . . . . . . . 11
5. Prefix SID Sub-TLV . . . . . . . . . . . . . . . . . . . . . 13
6. Adjacency Segment Identifier (Adj-SID) . . . . . . . . . . . 16
6.1. Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . . . 16
6.2. LAN Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . 18
7. Elements of Procedure . . . . . . . . . . . . . . . . . . . . 19
7.1. Intra-area Segment routing in OSPFv2 . . . . . . . . . . 19
7.2. Inter-area Segment routing in OSPFv2 . . . . . . . . . . 20
7.3. Segment Routing for External Prefixes . . . . . . . . . . 21
7.4. Advertisement of Adj-SID . . . . . . . . . . . . . . . . 21
7.4.1. Advertisement of Adj-SID on Point-to-Point Links . . 21
7.4.2. Adjacency SID on Broadcast or NBMA Interfaces . . . . 21
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22
8.1. OSPF OSPF Router Information (RI) TLVs Registry . . . . . 22
8.2. OSPF Extended Prefix LSA TLV Registry . . . . . . . . . . 22
8.3. OSPF Extended Prefix LSA Sub-TLV Registry . . . . . . . . 22
8.4. OSPF Extended Link LSA Sub-TLV Registry . . . . . . . . . 22
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