Multi-path Label Switched Paths Signaled Using RSVP-TE
draft-kompella-mpls-rsvp-ecmp-03

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Network Working Group                                        K. Kompella
Internet-Draft                                          Juniper Networks
Updates: 3209, 3473 (if approved)                           May 02, 2013
Intended status: Standards Track
Expires: November 03, 2013

         Multi-path Label Switched Paths Signaled Using RSVP-TE
                  draft-kompella-mpls-rsvp-ecmp-03.txt

Abstract

   This document describes extensions to Resource ReSerVation Protocol -
   Traffic Engineering for the set up of multi-path Traffic Engineered
   Label Switched Paths (LSPs) in Multi Protocol Label Switching and
   Generalized MPLS networks, i.e., LSPs that conform to traffic
   engineering constraints, but follow multiple independent paths from
   the source to the destination that allow load balancing.

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Kompella               Expires November 03, 2013                [Page 1]
Internet-Draft          Multi-path RSVP-TE LSPs                 May 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Conventions used in this document . . . . . . . . . . . .   3
   2.  Theory of Operation . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Multi-path Label Switched Paths . . . . . . . . . . . . .   4
     2.2.  ECMP  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Discussion  . . . . . . . . . . . . . . . . . . . . . . .   7
     2.4.  The Capabilities of TE-based Load Balancing . . . . . . .   8
   3.  Operation of MLSPs  . . . . . . . . . . . . . . . . . . . . .   8
     3.1.  Signaling MLSPs . . . . . . . . . . . . . . . . . . . . .   8
       3.1.1.  MLSP_TUNNEL Sender Template . . . . . . . . . . . . .   8
       3.1.2.  MLSP_TUNNEL Filter Specification  . . . . . . . . . .   9
     3.2.  Label Allocation  . . . . . . . . . . . . . . . . . . . .   9
     3.3.  Bandwidth Accounting  . . . . . . . . . . . . . . . . . .  10
     3.4.  MLSP Data Plane Actions . . . . . . . . . . . . . . . . .  11
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  11
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   In selecting a protocol for setting up and signaling "tunnel" Labeled
   Switched Paths (LSPs) in Multi Protocol Label Switching (MPLS) and
   Generalized MPLS (GMPLS) networks, one first chooses whether one
   wants Equal Cost Multi-Path (ECMP) load balancing or Traffic
   Engineering (TE).  For the former, one uses the Label Distribution
   Protocol (LDP) ([RFC5036]); for the latter, the Resource ReSerVation
   Protocol - Traffic Engineering (RSVP-TE) ([RFC3209]).  [Two other
   criteria, the need for fast protection and the desire for less
   configuration, are no longer the deciding factors they used to be,
   thanks to "IP fast reroute" ([RFC5286]) and "RSVP-TE automesh"
   ([RFC4972])].

   This document describes how one can set up a tunnel LSP that has both
   ECMP and TE characteristics using RSVP-TE.  The techniques described
   in this document can be used to create a single overall "ECMP TE LSP"
   to a single destination that consists of several "sub-LSPs", each
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