Encapsulating MPLS in UDP
RFC 7510

Document Type RFC - Proposed Standard (April 2015; Errata)
Last updated 2015-10-14
Replaces draft-xu-mpls-in-udp
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Stream WG state Submitted to IESG for Publication (wg milestone: Jun 2015 - ++ Progress draft-ie... )
Document shepherd Loa Andersson
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Internet Engineering Task Force (IETF)                             X. Xu
Request for Comments: 7510                           Huawei Technologies
Category: Standards Track                                       N. Sheth
ISSN: 2070-1721                                         Juniper Networks
                                                                 L. Yong
                                                              Huawei USA
                                                               R. Callon
                                                        Juniper Networks
                                                                D. Black
                                                         EMC Corporation
                                                              April 2015

                       Encapsulating MPLS in UDP

Abstract

   This document specifies an IP-based encapsulation for MPLS, called
   MPLS-in-UDP for situations where UDP (User Datagram Protocol)
   encapsulation is preferred to direct use of MPLS, e.g., to enable
   UDP-based ECMP (Equal-Cost Multipath) or link aggregation.  The MPLS-
   in-UDP encapsulation technology must only be deployed within a single
   network (with a single network operator) or networks of an adjacent
   set of cooperating network operators where traffic is managed to
   avoid congestion, rather than over the Internet where congestion
   control is required.  Usage restrictions apply to MPLS-in-UDP usage
   for traffic that is not congestion controlled and to UDP zero
   checksum usage with IPv6.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7510.

Xu, et al.                   Standards Track                    [Page 1]
RFC 7510                Encapsulating MPLS in UDP             April 2015

Copyright Notice

   Copyright (c) 2015 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Existing Encapsulations . . . . . . . . . . . . . . . . .   3
     1.2.  Motivations for MPLS-in-UDP Encapsulation . . . . . . . .   4
     1.3.  Applicability Statements  . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Encapsulation in UDP  . . . . . . . . . . . . . . . . . . . .   5
     3.1.  UDP Checksum Usage with IPv6  . . . . . . . . . . . . . .   6
     3.2.  Middlebox Considerations for IPv6 UDP Zero Checksums  . .  10
   4.  Processing Procedures . . . . . . . . . . . . . . . . . . . .  10
   5.  Congestion Considerations . . . . . . . . . . . . . . . . . .  11
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  17
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19

Xu, et al.                   Standards Track                    [Page 2]
RFC 7510                Encapsulating MPLS in UDP             April 2015

1.  Introduction

   This document specifies an IP-based encapsulation for MPLS, i.e.,
   MPLS-in-UDP, which is applicable in some circumstances where IP-based
   encapsulation for MPLS is required and further fine-grained load
   balancing of MPLS packets over IP networks over Equal-Cost Multipath
   (ECMP) and/or Link Aggregation Groups (LAGs) is required as well.
   There are already IP-based encapsulations for MPLS that allow for
   fine-grained load balancing by using some special field in the
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