A Backward-Recursive PCE-Based Computation (BRPC) Procedure to Compute Shortest Constrained Inter-Domain Traffic Engineering Label Switched Paths
RFC 5441
Document | Type |
RFC - Proposed Standard
(April 2009; Errata)
Was draft-ietf-pce-brpc (pce WG)
|
|
---|---|---|---|
Authors | Vasseur Jp , Jean-Louis Le Roux , Raymond Zhang , Nabil Bitar | ||
Last updated | 2020-01-21 | ||
Replaces | draft-vasseur-pce-brpc | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5441 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ross Callon | ||
Send notices to | (None) |
Network Working Group JP. Vasseur, Ed. Request for Comments: 5441 Cisco Systems, Inc Category: Standards Track R. Zhang BT Infonet N. Bitar Verizon JL. Le Roux France Telecom April 2009 A Backward-Recursive PCE-Based Computation (BRPC) Procedure to Compute Shortest Constrained Inter-Domain Traffic Engineering Label Switched Paths Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (c) 2009 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 in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Vasseur, et al. Standards Track [Page 1] RFC 5441 BRPC April 2009 Abstract The ability to compute shortest constrained Traffic Engineering Label Switched Paths (TE LSPs) in Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks across multiple domains has been identified as a key requirement. In this context, a domain is a collection of network elements within a common sphere of address management or path computational responsibility such as an IGP area or an Autonomous Systems. This document specifies a procedure relying on the use of multiple Path Computation Elements (PCEs) to compute such inter-domain shortest constrained paths across a predetermined sequence of domains, using a backward-recursive path computation technique. This technique preserves confidentiality across domains, which is sometimes required when domains are managed by different service providers. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. General Assumptions . . . . . . . . . . . . . . . . . . . . . 5 4. BRPC Procedure . . . . . . . . . . . . . . . . . . . . . . . . 5 4.1. Domain Path Selection . . . . . . . . . . . . . . . . . . 6 4.2. Mode of Operation . . . . . . . . . . . . . . . . . . . . 6 5. PCEP Protocol Extensions . . . . . . . . . . . . . . . . . . . 8 6. VSPT Encoding . . . . . . . . . . . . . . . . . . . . . . . . 9 7. Inter-AS TE Links . . . . . . . . . . . . . . . . . . . . . . 10 8. Usage in Conjunction with Per-Domain Path Computation . . . . 10 9. BRPC Procedure Completion Failure . . . . . . . . . . . . . . 10 10. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 11 10.1. Diverse End-to-End Path Computation . . . . . . . . . . . 11 10.2. Path Optimality . . . . . . . . . . . . . . . . . . . . . 12 11. Reoptimization of an Inter-Domain TE LSP . . . . . . . . . . . 12 12. Path Computation Failure . . . . . . . . . . . . . . . . . . . 12 13. Metric Normalization . . . . . . . . . . . . . . . . . . . . . 12 14. Manageability Considerations . . . . . . . . . . . . . . . . . 13 14.1. Control of Function and Policy . . . . . . . . . . . . . . 13 14.2. Information and Data Models . . . . . . . . . . . . . . . 13 14.3. Liveness Detection and Monitoring . . . . . . . . . . . . 13Show full document text