Application-aware Targeted LDP
draft-ietf-mpls-app-aware-tldp-08

Document Type Active Internet-Draft (mpls WG)
Last updated 2017-06-22 (latest revision 2017-05-24)
Replaces draft-esale-mpls-app-aware-tldp
Stream IETF
Intended RFC status Proposed Standard
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Shepherd write-up Show (last changed 2016-07-17)
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MPLS Working Group                                         Santosh Esale
INTERNET-DRAFT                                           Raveendra Torvi
Updates: 7473 (if approved)                             Juniper Networks
Intended Status: Proposed Standard                            Luay Jalil
Expires: November 25, 2017                                       Verizon
                                                            Uma Chunduri
                                                                  Huawei
                                                             Kamran Raza
                                                     Cisco Systems, Inc.
                                                            May 24, 2017

                     Application-aware Targeted LDP
                   draft-ietf-mpls-app-aware-tldp-08

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. This document updates RFC 7473 for
   enabling advertisement of 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
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Esale, et al.          Expires November 25, 2017                [Page 1]
INTERNET DRAFT      <draft-ietf-mpls-app-aware-tldp>        May 24, 2017

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Copyright and License Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors. All rights reserved.

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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 . . . . . . . . . . . . . . . . . . . . 13
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