Insertion of IPv6 Segment Routing Headers in a Controlled Domain
draft-voyer-6man-extension-header-insertion-07
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2019-09-20
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Network Working Group D. Voyer, Ed.
Internet-Draft Bell Canada
Intended status: Standards Track C. Filsfils
Expires: March 23, 2020 D. Dukes, Ed.
Cisco Systems, Inc.
S. Matsushima
Softbank
J. Leddy
Individual Contributor
September 20, 2019
Insertion of IPv6 Segment Routing Headers in a Controlled Domain
draft-voyer-6man-extension-header-insertion-07
Abstract
Traffic traversing an SR domain is encapsulated in an outer IPv6
header for its journey through the SR domain.
To implement transport services strictly within the SR domain, the SR
domain may require insertion or removal of an SRH after the outer
IPv6 header of the SR domain. Any segment within the SRH is strictly
contained within the SR domain.
The SR domain always preserves the end-to-end integrity of traffic
traversing it. No extension header is manipulated, inserted or
removed from an inner transported packet. The packet leaving the SR
domain is exactly the same (except for the hop-limit update) as the
packet entering the SR domain.
The SR domain is designed with link MTU sufficiently greater than the
MTU at the ingress edge of the SR domain.
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 RFC 2119 [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
Voyer, et al. Expires March 23, 2020 [Page 1]
Internet-Draft SRH Insertion September 2019
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 23, 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
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. SRH-based Services Within the SR Domain . . . . . . . . . . . 3
2.1. Actions Within the SR Domain . . . . . . . . . . . . . . 5
2.2. Constraints . . . . . . . . . . . . . . . . . . . . . . . 5
3. Detailed Description of Actions in the SR Domain . . . . . . 6
3.1. Action 2: SRH Insertion . . . . . . . . . . . . . . . . . 6
3.2. Action 3: SRH Removal . . . . . . . . . . . . . . . . . . 7
4. MTU Considerations . . . . . . . . . . . . . . . . . . . . . 7
4.1. ICMP Error Processing . . . . . . . . . . . . . . . . . . 8
4.2. Packet Too Big . . . . . . . . . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 9
6. Action Within the SR Domain and RFC8200 . . . . . . . . . . . 9
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 11
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.1. Normative References . . . . . . . . . . . . . . . . . . 11
9.2. Informative References . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
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Internet-Draft SRH Insertion September 2019
1. Introduction
This document describes insertion and removal of SRH within an SR
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