SR-MPLS over IP
draft-xu-mpls-sr-over-ip-01
Network Working Group X. Xu
Internet-Draft Alibaba
Intended status: Standards Track S. Bryant
Expires: December 3, 2018 Huawei
A. Farrel
Juniper
S. Hassan
Cisco
W. Henderickx
Nokia
Z. Li
Huawei
June 1, 2018
SR-MPLS over IP
draft-xu-mpls-sr-over-ip-01
Abstract
MPLS Segment Routing (SR-MPLS in short) is an MPLS data plane-based
source routing paradigm in which the sender of a packet is allowed to
partially or completely specify the route the packet takes through
the network by imposing stacked MPLS labels on the packet. SR-MPLS
could be leveraged to realize a source routing mechanism across MPLS,
IPv4, and IPv6 data planes by using an MPLS label stack as a source
routing instruction set while preserving backward compatibility with
SR-MPLS.
This document describes how SR-MPLS capable routers and IP-only
routers can seamlessly co-exist and interoperate through the use of
SR-MPLS label stacks and IP encapsulation/tunneling such as MPLS-in-
UDP as defined in RFC 7510.
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Xu, et al. Expires December 3, 2018 [Page 1]
Internet-Draft SR-MPLS over IP June 2018
This Internet-Draft will expire on December 3, 2018.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Procedures of SR-MPLS over IP . . . . . . . . . . . . . . . . 5
4.1. Forwarding Entry Construction . . . . . . . . . . . . . . 5
4.2. Packet Forwarding Procedures . . . . . . . . . . . . . . 7
4.2.1. Packet Forwarding with Penultimate Hop Popping . . . 8
4.2.2. Packet Forwarding without Penultimate Hop Popping . . 9
4.2.3. Additional Forwarding Procedures . . . . . . . . . . 10
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
6. Security Considerations . . . . . . . . . . . . . . . . . . . 12
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 12
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.1. Normative References . . . . . . . . . . . . . . . . . . 13
9.2. Informative References . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction
MPLS Segment Routing (SR-MPLS in short)
[I-D.ietf-spring-segment-routing-mpls] is an MPLS data plane-based
source routing paradigm in which the sender of a packet is allowed to
partially or completely specify the route the packet takes through
the network by imposing stacked MPLS labels on the packet. SR-MPLS
could be leveraged to realize a source routing mechanism across MPLS,
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