Conveying Vendor-Specific Constraints in the Path Computation Element Communication Protocol
RFC 7470

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Internet Engineering Task Force (IETF)                          F. Zhang
Request for Comments: 7470                                        Huawei
Obsoletes: 7150                                                A. Farrel
Category: Standards Track                               Juniper Networks
ISSN: 2070-1721                                               March 2015

                 Conveying Vendor-Specific Constraints
         in the Path Computation Element Communication Protocol

Abstract

   The Path Computation Element Communication Protocol (PCEP) is used to
   convey path computation requests and responses both between Path
   Computation Clients (PCCs) and Path Computation Elements (PCEs) and
   between cooperating PCEs.  In PCEP, the path computation requests
   carry details of the constraints and objective functions that the PCC
   wishes the PCE to apply in its computation.

   This document defines a facility to carry vendor-specific information
   in PCEP using a dedicated object and a new Type-Length-Value (TLV)
   that can be carried in any PCEP object that supports TLVs.

   This document obsoletes RFC 7150.  The only changes from that
   document are a clarification of the use of the new Type-Length-Value
   and the allocation of a different code point for the VENDOR-
   INFORMATION object.

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/rfc7470.

Zhang & Farrel               Standards Track                    [Page 1]
RFC 7470           Vendor-Specific Constraints in PCE         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
      1.1. Conventions Used in This Document ..........................4
   2. Procedures for the Vendor Information Object ....................5
      2.1. Backward Compatibility for the Vendor Information Object ...7
   3. Procedures for the Vendor Information TLV .......................7
      3.1. Backward Compatibility .....................................8
   4. Protocol Elements ...............................................8
   5. IANA Considerations .............................................9
      5.1. New PCEP Object ............................................9
      5.2. New PCEP TLV ...............................................9
   6. Management Considerations ......................................10
      6.1. Control of Function and Policy ............................10
      6.2. Information and Data Models ...............................10
      6.3. Liveness Detection and Monitoring .........................10
      6.4. Verifying Correct Operation ...............................10
      6.5. Requirements on Other Protocols and Functional Components .11
      6.6. Impact on Network Operation ...............................11
   7. Security Considerations ........................................11
   8. References .....................................................12
      8.1. Normative References ......................................12
      8.2. Informative References ....................................12
   Acknowledgements ..................................................14
   Contributors ......................................................14
   Authors' Addresses ................................................14

Zhang & Farrel               Standards Track                    [Page 2]
RFC 7470           Vendor-Specific Constraints in PCE         March 2015

1.  Introduction

   A Path Computation Element (PCE) is an entity (component,
   application, or network node) that is capable of computing a network
   path or route based on a network graph and applying computational
   constraints.  An architecture for the use of PCEs is defined in
   [RFC4655].