Requirements for MPLS Over a Composite Link
draft-ietf-rtgwg-cl-requirement-05

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RTGWG                                                 C. Villamizar, Ed.
Internet-Draft                                                OCCNC, LLC
Intended status: Informational                           D. McDysan, Ed.
Expires: August 2, 2012                                          S. Ning
                                                                A. Malis
                                                                 Verizon
                                                                 L. Yong
                                                              Huawei USA
                                                        January 30, 2012

              Requirements for MPLS Over a Composite Link
                   draft-ietf-rtgwg-cl-requirement-05

Abstract

   There is often a need to provide large aggregates of bandwidth that
   are best provided using parallel links between routers or MPLS LSR.
   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
   within a microflow as is current practice.

   Current practice related to multipath is described briefly in an
   appendix.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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Villamizar, et al.       Expires August 2, 2012                 [Page 1]
Internet-Draft         Composite Link Requirements          January 2012

   This Internet-Draft will expire on August 2, 2012.

Copyright Notice

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   document authors.  All rights reserved.

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Villamizar, et al.       Expires August 2, 2012                 [Page 2]
Internet-Draft         Composite Link Requirements          January 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
   2.  Assumptions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Network Operator Functional Requirements . . . . . . . . . . .  5
     4.1.  Availability, Stability and Transient Response . . . . . .  5
     4.2.  Component Links Provided by Lower Layer Networks . . . . .  6
     4.3.  Parallel Component Links with Different Characteristics  .  7
   5.  Derived Requirements . . . . . . . . . . . . . . . . . . . . .  9
   6.  Management Requirements  . . . . . . . . . . . . . . . . . . . 10
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 11
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 11
     10.2. Informative References . . . . . . . . . . . . . . . . . . 12
     10.3. Appendix References  . . . . . . . . . . . . . . . . . . . 13
   Appendix A.  Existing Network Operator Practices and Protocol
                Usage . . . . . . . . . . . . . . . . . . . . . . . . 14
   Appendix B.  Existing Multipath Standards and Techniques . . . . . 14
   Appendix C.  ITU-T G.800 Composite Link Definitions and
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