Composite Link Use Cases and Design Considerations
draft-ietf-rtgwg-cl-use-cases-00

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RTGWG                                                            S. Ning
Internet-Draft                                       Tata Communications
Intended status: Informational                                  A. Malis
Expires: February 13, 2013                                    D. McDysan
                                                                 Verizon
                                                                 L. Yong
                                                              Huawei USA
                                                           C. Villamizar
                                                  Outer Cape Cod Network
                                                              Consulting
                                                         August 12, 2012

           Composite Link Use Cases and Design Considerations
                    draft-ietf-rtgwg-cl-use-cases-00

Abstract

   This document provides a set of use cases and design considerations
   for composite links.

   Composite link is a formalization of multipath techniques currently
   in use in IP and MPLS networks and a set of extensions to multipath
   techniques.

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 February 13, 2013.

Copyright Notice

   Copyright (c) 2012 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

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Internet-Draft          Composite Link Use Cases             August 2012

   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
   2.  Conventions used in this document  . . . . . . . . . . . . . .  3
     2.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Composite Link Foundation Use Cases  . . . . . . . . . . . . .  4
   4.  Delay Sensitive Applications . . . . . . . . . . . . . . . . .  7
   5.  Large Volume of IP and LDP Traffic . . . . . . . . . . . . . .  7
   6.  Composite Link and Packet Ordering . . . . . . . . . . . . . .  8
     6.1.  MPLS-TP in network edges only  . . . . . . . . . . . . . . 10
     6.2.  Composite Link at core LSP ingress/egress  . . . . . . . . 11
     6.3.  MPLS-TP as a MPLS client . . . . . . . . . . . . . . . . . 12
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 12
   8.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 13
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 13
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 13
   Appendix A.  More Details on Existing Network Operator
                Practices and Protocol Usage  . . . . . . . . . . . . 15
   Appendix B.  Existing Multipath Standards and Techniques . . . . . 17
     B.1.  Common Multpath Load Spliting Techniques . . . . . . . . . 18
     B.2.  Simple and Adaptive Load Balancing Multipath . . . . . . . 19
     B.3.  Traffic Split over Parallel Links  . . . . . . . . . . . . 20
     B.4.  Traffic Split over Multiple Paths  . . . . . . . . . . . . 20
   Appendix C.  Characteristics of Transport in Core Networks . . . . 20
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 22

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1.  Introduction

   Composite link requirements are specified in
   [I-D.ietf-rtgwg-cl-requirement].  A composite link framework is
   defined in [I-D.so-yong-rtgwg-cl-framework].

   Multipath techniques have been widely used in IP networks for over
   two decades.  The use of MPLS began more than a decade ago.
   Multipath has been widely used in IP/MPLS networks for over a decade
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