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Controlling State Advertisements of Non-negotiated LDP Applications (RFC7473)

IP.com Disclosure Number: IPCOM000240910D
Original Publication Date: 2015-Mar-01
Included in the Prior Art Database: 2015-Mar-12
Document File: 30 page(s) / 36K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Raza: AUTHOR [+2]


The LDP Capabilities specification [RFC5561] introduced a mechanism to negotiate LDP capabilities for a given feature between peer Label Switching Routers (LSRs). The capability mechanism ensures that no unnecessary state is exchanged between peer LSRs unless the corresponding feature capability is successfully negotiated between the peers.

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Internet Engineering Task Force (IETF)                           K. Raza Request for Comments: 7473                                    S. Boutros Category: Standards Track                            Cisco Systems, Inc. ISSN: 2070-1721                                               March 2015

   Controlling State Advertisements of Non-negotiated LDP Applications


   There is no capability negotiation done for Label Distribution    Protocol (LDP) applications that set up Label Switched Paths (LSPs)    for IP prefixes or that signal point-to-point (P2P) Pseudowires (PWs)    for Layer 2 Virtual Private Networks (L2VPNs).  When an LDP session    comes up, an LDP speaker may unnecessarily advertise its local state    for such LDP applications even when the peer session is established    for some other applications like Multipoint LDP (mLDP) or the Inter-    Chassis Communication Protocol (ICCP).  This document defines a    solution by which an LDP speaker announces to its peer its    disinterest in such non-negotiated applications, thus disabling the    unnecessary advertisement of corresponding application state, which    would have otherwise been advertised over the established LDP    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 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc7473.

 Raza & Boutros               Standards Track                    [Page 1]
 RFC 7473        State Adv. Control of Non-negotiated Apps     March 2015

 Copyright Notice

   Copyright (c) 2015 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    (http://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 ........................................