Requirements for Advanced Multipath in MPLS Networks
draft-ietf-rtgwg-cl-requirement-15

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Document Type Active Internet-Draft (rtgwg WG)
Last updated 2014-02-06 (latest revision 2014-01-25)
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Intended RFC status Informational
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RTGWG                                                 C. Villamizar, Ed.
Internet-Draft                                                OCCNC, LLC
Intended status: Informational                           D. McDysan, Ed.
Expires: July 29, 2014                                           Verizon
                                                                 S. Ning
                                                     Tata Communications
                                                                A. Malis
                                                              Consultant
                                                                 L. Yong
                                                              Huawei USA
                                                        January 25, 2014

          Requirements for Advanced Multipath in MPLS Networks
                   draft-ietf-rtgwg-cl-requirement-15

Abstract

   This document provides a set of requirements for Advanced Multipath
   in MPLS Networks.

   Advanced Multipath is a formalization of multipath techniques
   currently in use in IP and MPLS networks and a set of extensions to
   existing multipath techniques.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on July 29, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Villamizar, et al.        Expires July 29, 2014                 [Page 1]
Internet-Draft       Advanced Multipath Requirements        January 2014

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Functional Requirements . . . . . . . . . . . . . . . . . . .   6
     3.1.  Availability, Stability and Transient Response  . . . . .   6
     3.2.  Component Links Provided by Lower Layer Networks  . . . .   8
     3.3.  Component Links with Different Characteristics  . . . . .   8
     3.4.  Considerations for Bidirectional Client LSP . . . . . . .   9
     3.5.  Multipath Load Balancing Dynamics . . . . . . . . . . . .  10
   4.  General Requirements for Protocol Solutions . . . . . . . . .  12
   5.  Management Requirements . . . . . . . . . . . . . . . . . . .  13
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   There is often a need to provide large aggregates of bandwidth that
   are best provided using parallel links between routers or carrying
   traffic over multiple MPLS Label Switched Paths (LSPs).  In core
   networks there is often no alternative since the aggregate capacities
   of core networks today far exceed the capacity of a single physical
   link or single packet processing element.

   The presence of parallel links, with each link potentially comprised
   of multiple layers has resulted in additional requirements.  Certain
   services may benefit from being restricted to a subset of the
   component links or a specific component link, where component link
   characteristics, such as latency, differ.  Certain services require
   that an LSP be treated as atomic and avoid reordering.  Other
   services will continue to require only that reordering not occur
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