Encapsulating MPLS in UDP
draft-ietf-mpls-in-udp-09

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Document Type Active Internet-Draft (mpls WG)
Last updated 2015-01-12 (latest revision 2014-12-18)
Replaces draft-xu-mpls-in-udp
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Network Working Group                                              X. Xu
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                                N. Sheth
Expires: June 21, 2015                                  Juniper Networks
                                                                 L. Yong
                                                              Huawei USA
                                                               R. Callon
                                                        Juniper Networks
                                                                D. Black
                                                         EMC Corporation
                                                       December 18, 2014

                       Encapsulating MPLS in UDP
                       draft-ietf-mpls-in-udp-09

Abstract

   This document specifies an IP-based encapsulation for MPLS, called
   MPLS-in-UDP (User Datagram Protocol) for situations where UDP
   encapsulation is preferred to direct use of MPLS, e.g., to enable
   UDP-based ECMP (Equal Cost Multi-Pathing) or link aggregation.  MPLS-
   in-UDP is primarily applicable to service provider networks, and
   additional 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 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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   This Internet-Draft will expire on June 21, 2015.

Xu, et al.                Expires June 21, 2015                 [Page 1]
Internet-Draft          Encapsulating MPLS in UDP          December 2014

Copyright Notice

   Copyright (c) 2014 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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Existing Encapsulations . . . . . . . . . . . . . . . . .   3
     1.2.  Motivations for MPLS-in-UDP Encapsulation . . . . . . . .   3
     1.3.  Application Statements  . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Encapsulation in UDP  . . . . . . . . . . . . . . . . . . . .   4
     3.1.  UDP Checksum Usage with IPv6  . . . . . . . . . . . . . .   6
     3.2.  Middlebox Considerations for IPv6 UDP Zero Checksums  . .   9
   4.  Processing Procedures . . . . . . . . . . . . . . . . . . . .   9
   5.  Congestion Considerations . . . . . . . . . . . . . . . . . .  10
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  14
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     10.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   This document specifies an IP-based encapsulation for MPLS, i.e.
   MPLS-in-UDP (User Datagram Protocol), 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 Multi-Path (ECMP) and/or Link Aggregation Groups
   (LAG) 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 encapsulation header as an entropy field.
   However, MPLS-in-UDP can be advantageous since some networks have
   used the UDP port number fields as a basis for load-balancing
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