Application-Aware Targeted LDP
RFC 8223

Document Type RFC - Proposed Standard (August 2017; No errata)
Updates RFC 7473
Last updated 2017-08-31
Replaces draft-esale-mpls-app-aware-tldp
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Loa Andersson
Shepherd write-up Show (last changed 2016-07-17)
IESG IESG state RFC 8223 (Proposed Standard)
Consensus Boilerplate Yes
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Responsible AD Deborah Brungard
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                          S. Esale
Request for Comments: 8223                                      R. Torvi
Updates: 7473                                           Juniper Networks
Category: Standards Track                                       L. Jalil
ISSN: 2070-1721                                                  Verizon
                                                             U. Chunduri
                                                                  Huawei
                                                                 K. Raza
                                                     Cisco Systems, Inc.
                                                             August 2017

                     Application-Aware Targeted LDP

Abstract

   Recent Targeted Label Distribution Protocol (tLDP) applications, such
   as remote Loop-Free Alternates (LFAs) and BGP auto-discovered
   pseudowires, may automatically establish a tLDP session with any
   Label Switching Router (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 the Targeted
   Application 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 is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8223.

Esale, et al.                Standards Track                    [Page 1]
RFC 8223                 Application-Aware tLDP              August 2017

Copyright Notice

   Copyright (c) 2017 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions Used in This Document ..........................4
      1.2. Terminology ................................................4
   2. Targeted Application Capability .................................5
      2.1. Encoding ...................................................5
      2.2. Procedures .................................................5
      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
   7. IANA Considerations ............................................14
   8. References .....................................................15
      8.1. Normative References ......................................15
      8.2. Informative References ....................................16
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