SR-MPLS over IP
draft-ietf-mpls-sr-over-ip-01

Document Type Active Internet-Draft (mpls WG)
Last updated 2018-12-03 (latest revision 2018-10-18)
Replaces draft-xu-mpls-sr-over-ip
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Network Working Group                                              X. Xu
Internet-Draft                                              Alibaba Inc.
Intended status: Standards Track                               S. Bryant
Expires: April 21, 2019                                           Huawei
                                                               A. Farrel
                                                      Old Dog Consulting
                                                               S. Hassan
                                                                   Cisco
                                                           W. Henderickx
                                                                   Nokia
                                                                   Z. Li
                                                                  Huawei
                                                        October 18, 2018

                            SR-MPLS over IP
                     draft-ietf-mpls-sr-over-ip-01

Abstract

   MPLS Segment Routing (SR-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,
   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.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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Xu, et al.               Expires April 21, 2019                 [Page 1]
Internet-Draft               SR-MPLS over IP                October 2018

   This Internet-Draft will expire on April 21, 2019.

Copyright Notice

   Copyright (c) 2018 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Procedures of SR-MPLS over IP . . . . . . . . . . . . . . . .   5
     3.1.  Forwarding Entry Construction . . . . . . . . . . . . . .   5
     3.2.  Packet Forwarding Procedures  . . . . . . . . . . . . . .   7
       3.2.1.  Packet Forwarding with Penultimate Hop Popping  . . .   8
       3.2.2.  Packet Forwarding without Penultimate Hop Popping . .   9
       3.2.3.  Additional Forwarding Procedures  . . . . . . . . . .  10
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   MPLS Segment Routing (SR-MPLS) [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
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