IS-IS Extensions to Support Routing over IPv6 Dataplane
draft-bashandy-isis-srv6-extensions-05
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2019-03-06
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Networking Working Group P. Psenak, Ed.
Internet-Draft C. Filsfils
Intended status: Standards Track Cisco Systems
Expires: September 7, 2019 A. Bashandy
Individual
B. Decraene
Orange
Z. Hu
Huawei Technologies
March 6, 2019
IS-IS Extensions to Support Routing over IPv6 Dataplane
draft-bashandy-isis-srv6-extensions-05.txt
Abstract
Segment Routing (SR) allows for a flexible definition of end-to-end
paths by encoding paths as sequences of topological sub-paths, called
"segments". Segment routing architecture can be implemented over an
MPLS data plane as well as an IPv6 data plane. This draft describes
the IS-IS extensions required to support Segment Routing over an IPv6
data plane.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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 September 7, 2019.
Psenak, et al. Expires September 7, 2019 [Page 1]
Internet-Draft draft-bashandy-isis-srv6-extensions March 2019
Copyright Notice
Copyright (c) 2019 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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . . . . 3
3. Advertising Supported Algorithms . . . . . . . . . . . . . . 4
4. Advertising Maximum SRv6 SID Depths . . . . . . . . . . . . . 4
4.1. Maximum Segments Left MSD Type . . . . . . . . . . . . . 5
4.2. Maximum End Pop MSD Type . . . . . . . . . . . . . . . . 5
4.3. Maximum T.Insert MSD Type . . . . . . . . . . . . . . . . 5
4.4. Maximum T.Encaps MSD Type . . . . . . . . . . . . . . . . 5
4.5. Maximum End D MSD Type . . . . . . . . . . . . . . . . . 6
5. SRv6 SIDs and Reachability . . . . . . . . . . . . . . . . . 6
6. Advertising Locators and End SIDs . . . . . . . . . . . . . . 7
6.1. SRv6 Locator TLV Format . . . . . . . . . . . . . . . . . 8
6.2. SRv6 End SID sub-TLV . . . . . . . . . . . . . . . . . . 9
7. Advertising SRv6 End.X SIDs . . . . . . . . . . . . . . . . . 11
7.1. SRv6 End.X SID sub-TLV . . . . . . . . . . . . . . . . . 11
7.2. SRv6 LAN End.X SID sub-TLV . . . . . . . . . . . . . . . 13
8. Advertising Endpoint Behaviors . . . . . . . . . . . . . . . 14
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
9.1. SRv6 Locator TLV . . . . . . . . . . . . . . . . . . . . 15
9.1.1. SRv6 End SID sub-TLV . . . . . . . . . . . . . . . . 15
9.1.2. Revised sub-TLV table . . . . . . . . . . . . . . . . 16
9.2. SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . . 16
9.3. SRv6 End.X SID and SRv6 LAN End.X SID sub-TLVs . . . . . 17
9.4. MSD Types . . . . . . . . . . . . . . . . . . . . . . . . 17
10. Security Considerations . . . . . . . . . . . . . . . . . . . 17
11. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 17
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