IPv6 Segment Routing Header (SRH)
draft-ietf-6man-segment-routing-header-23
| The information below is for an old version of the document | |||
|---|---|---|---|
| Document | Type | Active Internet-Draft (6man WG) | |
| Last updated | 2019-09-16 (latest revision 2019-08-06) | ||
| Replaces | draft-previdi-6man-segment-routing-header | ||
| Stream | IETF | ||
| Intended RFC status | Proposed Standard | ||
| Formats | pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Bob Hinden | ||
| Shepherd write-up | Show (last changed 2019-06-18) | ||
| IESG | IESG state | IESG Evaluation::AD Followup | |
| Consensus Boilerplate | Yes | ||
| Telechat date |
Has enough positions to pass. |
||
| Responsible AD | Suresh Krishnan | ||
| Send notices to | Robert Hinden <bob.hinden@gmail.com> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
Network Working Group C. Filsfils, Ed.
Internet-Draft D. Dukes, Ed.
Intended status: Standards Track Cisco Systems, Inc.
Expires: March 18, 2020 S. Previdi
Huawei
J. Leddy
Individual
S. Matsushima
Softbank
D. Voyer
Bell Canada
September 15, 2019
IPv6 Segment Routing Header (SRH)
draft-ietf-6man-segment-routing-header-23
Abstract
Segment Routing can be applied to the IPv6 data plane using a new
type of Routing Extension Header called the Segment Routing Header.
This document describes the Segment Routing Header and how it is used
by Segment Routing capable nodes.
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 March 18, 2020.
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
Provisions Relating to IETF Documents
Filsfils, et al. Expires March 18, 2020 [Page 1]
Internet-Draft IPv6 Segment Routing Header (SRH) September 2019
(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
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
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Segment Routing Header . . . . . . . . . . . . . . . . . . . 4
2.1. SRH TLVs . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.1. Padding TLVs . . . . . . . . . . . . . . . . . . . . 8
2.1.2. HMAC TLV . . . . . . . . . . . . . . . . . . . . . . 9
3. SR Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1. Source SR Node . . . . . . . . . . . . . . . . . . . . . 12
3.2. Transit Node . . . . . . . . . . . . . . . . . . . . . . 12
3.3. SR Segment Endpoint Node . . . . . . . . . . . . . . . . 12
4. Packet Processing . . . . . . . . . . . . . . . . . . . . . . 12
4.1. Source SR Node . . . . . . . . . . . . . . . . . . . . . 12
4.1.1. Reduced SRH . . . . . . . . . . . . . . . . . . . . . 13
4.2. Transit Node . . . . . . . . . . . . . . . . . . . . . . 13
4.3. SR Segment Endpoint Node . . . . . . . . . . . . . . . . 14
4.3.1. FIB Entry Is Locally Instantiated SRv6 SID . . . . . 14
4.3.2. FIB Entry Is A Local Interface . . . . . . . . . . . 16
4.3.3. FIB Entry Is A Non-Local Route . . . . . . . . . . . 17
4.3.4. FIB Entry Is A No Match . . . . . . . . . . . . . . . 17
5. Intra SR Domain Deployment Model . . . . . . . . . . . . . . 17
5.1. Securing the SR Domain . . . . . . . . . . . . . . . . . 17
5.2. SR Domain as A Single System with Delegation Among
Components . . . . . . . . . . . . . . . . . . . . . . . 18
5.3. MTU Considerations . . . . . . . . . . . . . . . . . . . 19
5.4. ICMP Error Processing . . . . . . . . . . . . . . . . . . 19
5.5. Load Balancing and ECMP . . . . . . . . . . . . . . . . . 19
5.6. Other Deployments . . . . . . . . . . . . . . . . . . . . 20
6. Illustrations . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1. Abstract Representation of an SRH . . . . . . . . . . . . 20
6.2. Example Topology . . . . . . . . . . . . . . . . . . . . 21
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