Encoding of Objective Functions in the Path Computation Element Communication Protocol (PCEP)
RFC 5541
Document | Type |
RFC - Proposed Standard
(June 2009; No errata)
Was draft-ietf-pce-of (pce WG)
|
|
---|---|---|---|
Authors | Jean-Louis Le Roux , Vasseur Jp , Young Lee | ||
Last updated | 2018-12-20 | ||
Replaces | draft-leroux-pce-of | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5541 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Adrian Farrel | ||
Send notices to | (None) |
Network Working Group JL. Le Roux Request for Comments: 5541 France Telecom Category: Standards Track JP. Vasseur Cisco System Inc. Y. Lee Huawei June 2009 Encoding of Objective Functions in the Path Computation Element Communication Protocol (PCEP) 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. Le Roux, et al. Standards Track [Page 1] RFC 5541 Objective Functions in PCEP June 2009 Abstract The computation of one or a set of Traffic Engineering Label Switched Paths (TE LSPs) in MultiProtocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks is subject to a set of one or more specific optimization criteria, referred to as objective functions (e.g., minimum cost path, widest path, etc.). In the Path Computation Element (PCE) architecture, a Path Computation Client (PCC) may want a path to be computed for one or more TE LSPs according to a specific objective function. Thus, the PCC needs to instruct the PCE to use the correct objective function. Furthermore, it is possible that not all PCEs support the same set of objective functions; therefore, it is useful for the PCC to be able to automatically discover the set of objective functions supported by each PCE. This document defines extensions to the PCE communication Protocol (PCEP) to allow a PCE to indicate the set of objective functions it supports. Extensions are also defined so that a PCC can indicate in a path computation request the required objective function, and a PCE can report in a path computation reply the objective function that was used for path computation. This document defines objective function code types for six objective functions previously listed in the PCE requirements work, and provides the definition of four new metric types that apply to a set of synchronized requests. Le Roux, et al. Standards Track [Page 2] RFC 5541 Objective Functions in PCEP June 2009 Table of Contents 1. Introduction ....................................................3 1.1. Conventions Used in This Document ..........................5 1.2. Terminology ................................................5 1.3. Message Formats ............................................6 2. Discovery of PCE Objective Functions ............................6 2.1. OF-List TLV ................................................6 2.2. Elements of Procedure ......................................7 3. Objective Function in PCEP Path Computation Request and Reply Messages ........................................................7 3.1. OF Object ..................................................7 3.1.1. Elements of Procedure ...............................8 3.2. Carrying The OF Object In a PCEP Message ...................9 3.3. New RP Object Flag ........................................12 3.3.1. Elements Of Procedure ..............................12Show full document text