Generalized Segment Routing Header
draft-lc-6man-generalized-srh-00
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SPRING Working Group Z. Li
Internet-Draft C. Li
Intended status: Standards Track Huawei Technologies
Expires: August 14, 2020 W. Cheng
China Mobile
C. Xie
C. Li
China Telecom
H. Tian
F. Zhao
CAICT
February 11, 2020
Generalized Segment Routing Header
draft-lc-6man-generalized-srh-00
Abstract
Generalized SRv6 network programming defines the enhanced mechanisms
of SRv6 to encode SRv6 SIDs, Compressed SIDs and even the MPLS labels
or IPv4 tunnel information in a single SRH. This type of SRH is
called Generalized SRH (G-SRH), which can reduce the overhead of SRv6
and also provide more flexibility for network programming. This
document defines the encapsulation and packet processing of G-SRH.
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 August 14, 2020.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Li, et al. Expires August 14, 2020 [Page 1]
Internet-Draft G-SRH February 2020
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
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
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. Generalized Segment Identifier . . . . . . . . . . . . . . . 4
3.1. SRv6 G-SID . . . . . . . . . . . . . . . . . . . . . . . 4
3.2. Compression G-SID . . . . . . . . . . . . . . . . . . . . 4
3.3. MPLS G-SID . . . . . . . . . . . . . . . . . . . . . . . 5
3.4. IPv4 G-SID . . . . . . . . . . . . . . . . . . . . . . . 6
4. Generalized Segment Routing Header (G-SRH) . . . . . . . . . 7
4.1. G-SRH for SRv6 Compression . . . . . . . . . . . . . . . 8
4.2. G-SRH for Crossing SR-MPLS Domains . . . . . . . . . . . 10
4.3. G-SRH for Crossing IPv4 Domains . . . . . . . . . . . . . 11
5. Packet Processing . . . . . . . . . . . . . . . . . . . . . . 14
5.1. Crossing SRv6 Compression Domains . . . . . . . . . . . . 14
5.2. Crossing SR-MPLS Domains . . . . . . . . . . . . . . . . 17
5.2.1. END.M . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3. Crossing IPv4 Domains . . . . . . . . . . . . . . . . . . 17
5.3.1. END.4 . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3.2. END.B4 . . . . . . . . . . . . . . . . . . . . . . . 18
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
7. Security Considerations . . . . . . . . . . . . . . . . . . . 19
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 19
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 19
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 19
10.1. Normative References . . . . . . . . . . . . . . . . . . 19
10.2. Informative References . . . . . . . . . . . . . . . . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 20
1. Introduction
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