Application-aware Targeted LDP
draft-ietf-mpls-app-aware-tldp-04

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Last updated 2016-05-06
Replaces draft-esale-mpls-app-aware-tldp
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MPLS Working Group                                         Santosh Esale
INTERNET-DRAFT                                           Raveendra Torvi
Intended Status: Proposed Standard                      Juniper Networks
Expires: November 7, 2016                                               
                                                              Luay Jalil
                                                                 Verizon

                                                             U. Chunduri
                                                           Ericsson Inc.

                                                             Kamran Raza
                                                      Cisco Systems Inc.

                                                             May 6, 2016

                     Application-aware Targeted LDP
                   draft-ietf-mpls-app-aware-tldp-04

Abstract

   Recent targeted LDP (tLDP) applications such as remote loop-free
   alternate (LFA) and BGP auto discovered pseudowire may automatically
   establish a tLDP session to any LSR in a network.  The initiating LSR
   has information about the targeted applications to administratively
   control initiation of the session. However, the responding LSR has no
   such information to control acceptance of this session. This document
   defines a mechanism to advertise and negotiate Targeted Applications
   Capability (TAC) during LDP session initialization.  As the
   responding LSR becomes aware of targeted applications, it may
   establish a limited number of tLDP sessions for certain applications.
   In addition, each targeted application is mapped to LDP Forwarding
   Equivalence Class (FEC) Elements to advertise only necessary LDP FEC-
   label bindings over the session.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as
   Internet-Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
 

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INTERNET DRAFT      <draft-ietf-mpls-app-aware-tldp>         May 6, 2016

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Copyright and License Notice

   Copyright (c) 2016 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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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1 Conventions Used in This Document  . . . . . . . . . . . . .  4
     1.2 Terminology  . . . . . . . . . . . . . . . . . . . . . . . .  5
   2. Targeted Application Capability . . . . . . . . . . . . . . . .  5
     2.1 Encoding . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     2.2 Procedures . . . . . . . . . . . . . . . . . . . . . . . . .  6
     2.3 LDP message procedures . . . . . . . . . . . . . . . . . . .  8
       2.3.1 Initialization message . . . . . . . . . . . . . . . . .  8
       2.3.2 Capability message . . . . . . . . . . . . . . . . . . .  8
   3. Targeted Application FEC Advertisement Procedures . . . . . . .  9
   4. Interaction of Targeted Application Capabilities and State 
      Advertisement Control Capabilities  . . . . . . . . . . . . . . 10
   5. Use cases . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     5.1 Remote LFA Automatic Targeted session  . . . . . . . . . . . 12
     5.2 FEC 129 Auto Discovery Targeted session  . . . . . . . . . . 13
     5.3 LDP over RSVP and Remote LFA targeted session  . . . . . . . 13
     5.4 mLDP node protection targeted session  . . . . . . . . . . . 13
   6  Security Considerations . . . . . . . . . . . . . . . . . . . . 14
 

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