SR-MPLS over IP
draft-ietf-mpls-sr-over-ip-07

Document Type Active Internet-Draft (mpls WG)
Last updated 2019-06-16
Replaces draft-xu-mpls-sr-over-ip
Stream IETF
Intended RFC status Proposed Standard
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Document shepherd Loa Andersson
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Responsible AD Deborah Brungard
Send notices to Loa Andersson <loa@pi.nu>
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Network Working Group                                              X. Xu
Internet-Draft                                              Alibaba, Inc
Intended status: Standards Track                               S. Bryant
Expires: December 18, 2019                                        Huawei
                                                               A. Farrel
                                                      Old Dog Consulting
                                                               S. Hassan
                                                                   Cisco
                                                           W. Henderickx
                                                                   Nokia
                                                                   Z. Li
                                                                  Huawei
                                                           June 16, 2019

                            SR-MPLS over IP
                     draft-ietf-mpls-sr-over-ip-07

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
   can 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 making no changes to SR-MPLS
   specifications and interworking with SR-MPLS implementations.

   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.

   Internet-Drafts are working documents of the Internet Engineering
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

Xu, et al.              Expires December 18, 2019               [Page 1]
Internet-Draft               SR-MPLS over IP                   June 2019

   This Internet-Draft will expire on December 18, 2019.

Copyright Notice

   Copyright (c) 2019 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
   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
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   described in the Simplified BSD License.

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
       3.1.1.  FIB Construction Example  . . . . . . . . . . . . . .   6
     3.2.  Packet Forwarding Procedures  . . . . . . . . . . . . . .   8
       3.2.1.  Packet Forwarding with Penultimate Hop Popping  . . .   9
       3.2.2.  Packet Forwarding without Penultimate Hop Popping . .  10
       3.2.3.  Additional Forwarding Procedures  . . . . . . . . . .  11
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  13
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

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
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