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Requirements for Advanced Multipath in MPLS Networks
RFC 7226

Document type: RFC - Informational (May 2014; No errata)
Document stream: IETF
Last updated: 2014-05-08
Other versions: plain text, pdf, html

IETF State: Submitted to IESG for Publication
Consensus: Yes
Document shepherd: Alia Atlas
Shepherd Write-Up: Last changed 2013-11-25

IESG State: RFC 7226 (Informational)
IANA Action State: No IC
Responsible AD: Alia Atlas
Send notices to: rtgwg-chairs@tools.ietf.org, draft-ietf-rtgwg-cl-requirement@tools.ietf.org

Internet Engineering Task Force (IETF)                C. Villamizar, Ed.
Request for Comments: 7226                                    OCCNC, LLC
Category: Informational                                  D. McDysan, Ed.
ISSN: 2070-1721                                                  Verizon
                                                                 S. Ning
                                                     Tata Communications
                                                                A. Malis
                                                                  Huawei
                                                                 L. Yong
                                                              Huawei USA
                                                                May 2014

          Requirements for Advanced Multipath in MPLS Networks

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 document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc7226.

Villamizar, et al.            Informational                     [Page 1]
RFC 7226             Advanced Multipath Requirements            May 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
   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  . . . . . . . . . . . . . . . . . . . . . . . .   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  . . . .   7
     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.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  15

Villamizar, et al.            Informational                     [Page 2]
RFC 7226             Advanced Multipath Requirements            May 2014

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 a 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

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