Service Programming with Segment Routing
draft-xuclad-spring-sr-service-programming-01
SPRING F. Clad, Ed.
Internet-Draft Cisco Systems, Inc.
Intended status: Standards Track X. Xu, Ed.
Expires: April 25, 2019 Alibaba
C. Filsfils
Cisco Systems, Inc.
D. Bernier
Bell Canada
C. Li
Huawei
B. Decraene
Orange
S. Ma
Juniper
C. Yadlapalli
AT&T
W. Henderickx
Nokia
S. Salsano
Universita di Roma "Tor Vergata"
October 22, 2018
Service Programming with Segment Routing
draft-xuclad-spring-sr-service-programming-01
Abstract
This document defines data plane functionality required to implement
service segments and achieve service programming in SR-enabled MPLS
and IP networks, as described in the Segment Routing architecture.
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This Internet-Draft will expire on April 25, 2019.
Clad, et al. Expires April 25, 2019 [Page 1]
Internet-Draft Service Programming with Segment Routing October 2018
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Classification and steering . . . . . . . . . . . . . . . . . 4
4. Service segments . . . . . . . . . . . . . . . . . . . . . . 5
4.1. SR-aware services . . . . . . . . . . . . . . . . . . . . 5
4.2. SR-unaware services . . . . . . . . . . . . . . . . . . . 6
5. SR service policies . . . . . . . . . . . . . . . . . . . . . 7
5.1. SR-MPLS data plane . . . . . . . . . . . . . . . . . . . 8
5.2. SRv6 data plane . . . . . . . . . . . . . . . . . . . . . 10
6. SR proxy behaviors . . . . . . . . . . . . . . . . . . . . . 11
6.1. Static SR proxy . . . . . . . . . . . . . . . . . . . . . 14
6.1.1. SR-MPLS pseudocode . . . . . . . . . . . . . . . . . 16
6.1.2. SRv6 pseudocode . . . . . . . . . . . . . . . . . . . 17
6.2. Dynamic SR proxy . . . . . . . . . . . . . . . . . . . . 19
6.2.1. SR-MPLS pseudocode . . . . . . . . . . . . . . . . . 19
6.2.2. SRv6 pseudocode . . . . . . . . . . . . . . . . . . . 20
6.3. Shared memory SR proxy . . . . . . . . . . . . . . . . . 21
6.4. Masquerading SR proxy . . . . . . . . . . . . . . . . . . 21
6.4.1. SRv6 masquerading proxy pseudocode . . . . . . . . . 22
6.4.2. Variant 1: Destination NAT . . . . . . . . . . . . . 23
6.4.3. Variant 2: Caching . . . . . . . . . . . . . . . . . 23
7. Metadata . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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