Use of Multipath with MPLS-TP and MPLS
draft-ietf-mpls-multipath-use-01

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Replaces draft-villamizar-mpls-multipath-use
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MPLS                                                  C. Villamizar, Ed.
Internet-Draft                                    Outer Cape Cod Network
Intended status: Informational                                Consulting
Expires: March 15, 2014                               September 11, 2013

                 Use of Multipath with MPLS-TP and MPLS
                    draft-ietf-mpls-multipath-use-01

Abstract

   Many MPLS implementations have supported multipath techniques and
   many MPLS deployments have used multipath techniques, particularly in
   very high bandwidth applications, such as provider IP/MPLS core
   networks.  MPLS-TP has strongly discouraged the use of multipath
   techniques.  Some degradation of MPLS-TP OAM performance cannot be
   avoided when operating over many types of multipath implementations.

   Using MPLS Entropy label, MPLS LSPs can be carried over multipath
   links while also providing a fully MPLS-TP compliant server layer for
   MPLS-TP LSPs.  This document describes the means of supporting MPLS
   as a server layer for MPLS-TP.  The use of MPLS-TP LSPs as a server
   layer for MPLS LSPs is also discussed.

Status of this Memo

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   This Internet-Draft will expire on March 15, 2014.

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   Copyright (c) 2013 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

Villamizar               Expires March 15, 2014                 [Page 1]
Internet-Draft         MPLS-TP and MPLS Multipath         September 2013

   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  MPLS as a Server Layer for MPLS-TP . . . . . . . . . . . . . .  5
     3.1.  MPLS-TP Forwarding and Server Layer Requirements . . . . .  6
     3.2.  Methods of Supporting MPLS-TP client LSPs over MPLS  . . .  7
   4.  MPLS-TP as a Server Layer for MPLS . . . . . . . . . . . . . . 10
   5.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11
   6.  Implementation Status  . . . . . . . . . . . . . . . . . . . . 11
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 12
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 12
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 12
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 13

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1.  Introduction

   Today the requirement to handle large aggregations of traffic, can be
   handled by a number of techniques which we will collectively call
   multipath.  Multipath applied to parallel links between the same set
   of nodes includes Ethernet Link Aggregation [IEEE-802.1AX], link
   bundling [RFC4201], or other aggregation techniques some of which may
   be vendor specific.  Multipath applied to diverse paths rather than
   parallel links includes Equal Cost MultiPath (ECMP) as applied to
   OSPF, ISIS, or BGP, and equal cost LSPs.  Some vendors support load
   split across equal cost MPLS LSPs where the load is split
   proportionally to the reserved bandwidth of the set of LSPs.

   RFC 5654 requirement 33 requires the capability to carry a client
   MPLS-TP or MPLS layer over a server MPLS-TP or MPLS layer [RFC5654].
   This is possible in all cases with one exception.  When an MPLS LSP
   exceeds the capacity of any single component link it may be carried
   by a network using multipath techniques, but may not be carried by a
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