Generalized Segment Routing Header
draft-lc-6man-generalized-srh-01
SPRING Working Group Z. Li
Internet-Draft C. Li
Intended status: Standards Track Huawei Technologies
Expires: February 15, 2021 W. Cheng
China Mobile
C. Xie
C. Li
China Telecom
H. Tian
F. Zhao
CAICT
August 14, 2020
Generalized Segment Routing Header
draft-lc-6man-generalized-srh-01
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
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This Internet-Draft will expire on February 15, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Li, et al. Expires February 15, 2021 [Page 1]
Internet-Draft G-SRH August 2020
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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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