Controlling State Advertisements of Non-negotiated LDP Applications
RFC 7473
Document | Type |
RFC - Proposed Standard
(March 2015; No errata)
Updated by RFC 8223
|
|
---|---|---|---|
Authors | Kamran Raza , Sami Boutros | ||
Last updated | 2015-10-14 | ||
Replaces | draft-raza-mpls-ldp-ip-pw-capability | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Loa Andersson | ||
Shepherd write-up | Show (last changed 2013-09-23) | ||
IESG | IESG state | RFC 7473 (Proposed Standard) | |
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Adrian Farrel | ||
Send notices to | (None) | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | RFC-Ed-Ack |
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 Abstract 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 ....................................................3 2. Conventions Used in This Document ...............................4 3. Non-negotiated LDP Applications .................................4 3.1. Uninteresting State ........................................5 3.1.1. Prefix-LSPs .........................................5 3.1.2. P2P-PWs .............................................5 4. Controlling State Advertisement .................................5 4.1. State Advertisement Control Capability .....................6 4.2. Capabilities Procedures ....................................8 4.2.1. State Control Capability in an Initialization Message ..............................9 4.2.2. State Control Capability in a Capability Message ....9 5. Applicability Statement .........................................9 6. Operational Examples ...........................................11 6.1. Disabling Prefix-LSPs and P2P-PWs on an ICCP Session ......11 6.2. Disabling Prefix-LSPs on a L2VPN/PW tLDP Session ..........11 6.3. Disabling Prefix-LSPs Dynamically on an Established LDP Session ...................................12 6.4. Disabling Prefix-LSPs on an mLDP-only Session .............12 6.5. Disabling IPv4 or IPv6 Prefix-LSPs on a Dual-Stack LSR ....12 7. Security Considerations ........................................13 8. IANA Considerations ............................................13 9. References .....................................................14 9.1. Normative References ......................................14 9.2. Informative References ....................................14 Acknowledgments ...................................................15 Authors' Addresses ................................................15 Raza & Boutros Standards Track [Page 2] RFC 7473 State Adv. Control of Non-negotiated Apps March 2015 1. Introduction 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 theShow full document text