Composite Link Framework in Multi Protocol Label Switching (MPLS)
draft-ietf-rtgwg-cl-framework-00

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Last updated 2012-08-12
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RTGWG                                                            S. Ning
Internet-Draft                                       Tata Communications
Intended status: Informational                                D. McDysan
Expires: February 13, 2013                                       Verizon
                                                              E. Osborne
                                                                   Cisco
                                                                 L. Yong
                                                              Huawei USA
                                                           C. Villamizar
                                                  Outer Cape Cod Network
                                                              Consulting
                                                         August 12, 2012

   Composite Link Framework in Multi Protocol Label Switching (MPLS)
                    draft-ietf-rtgwg-cl-framework-00

Abstract

   This document specifies a framework for support of composite link in
   MPLS networks.  A composite link consists of a group of homogenous or
   non-homogenous links that have the same forward adjacency and can be
   considered as a single TE link or an IP link in routing.  A composite
   link relies on its component links to carry the traffic over the
   composite link.  Applicability is described for a single pair of
   MPLS-capable nodes, a sequence of MPLS-capable nodes, or a set of
   layer networks connecting MPLS-capable nodes.

Status of this Memo

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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

Ning, et al.            Expires February 13, 2013               [Page 1]
Internet-Draft          Composite Link Framework             August 2012

   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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Architecture Summary . . . . . . . . . . . . . . . . . . .  4
     1.2.  Conventions used in this document  . . . . . . . . . . . .  5
       1.2.1.  Terminology  . . . . . . . . . . . . . . . . . . . . .  5
   2.  Composite Link Key Characteristics . . . . . . . . . . . . . .  5
     2.1.  Flow Identification  . . . . . . . . . . . . . . . . . . .  6
     2.2.  Composite Link in Control Plane  . . . . . . . . . . . . .  8
     2.3.  Composite Link in Data Plane . . . . . . . . . . . . . . . 11
   3.  Architecture Tradeoffs . . . . . . . . . . . . . . . . . . . . 11
     3.1.  Scalability Motivations  . . . . . . . . . . . . . . . . . 12
     3.2.  Reducing Routing Information and Exchange  . . . . . . . . 12
     3.3.  Reducing Signaling Load  . . . . . . . . . . . . . . . . . 13
       3.3.1.  Reducing Signaling Load using LDP  . . . . . . . . . . 14
       3.3.2.  Reducing Signaling Load using Hierarchy  . . . . . . . 14
       3.3.3.  Using Both LDP and RSVP-TE Hierarchy . . . . . . . . . 14
     3.4.  Reducing Forwarding State  . . . . . . . . . . . . . . . . 14
     3.5.  Avoiding Route Oscillation . . . . . . . . . . . . . . . . 15
   4.  New Challenges . . . . . . . . . . . . . . . . . . . . . . . . 16
     4.1.  Control Plane Challenges . . . . . . . . . . . . . . . . . 16
       4.1.1.  Delay and Jitter Sensitive Routing . . . . . . . . . . 17
       4.1.2.  Local Control of Traffic Distribution  . . . . . . . . 17
       4.1.3.  Path Symmetry Requirements . . . . . . . . . . . . . . 17
       4.1.4.  Requirements for Contained LSP . . . . . . . . . . . . 18
       4.1.5.  Retaining Backwards Compatibility  . . . . . . . . . . 19
     4.2.  Data Plane Challenges  . . . . . . . . . . . . . . . . . . 19
       4.2.1.  Very Large LSP . . . . . . . . . . . . . . . . . . . . 20
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