Conveying path setup type in PCEP messages
draft-ietf-pce-lsp-setup-type-00

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Last updated 2014-10-27
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PCE Working Group                                           S. Sivabalan
Internet-Draft                                                 J. Medved
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: April 28, 2015                                         I. Minei
                                                               E. Crabbe
                                                            Google, Inc.
                                                                R. Varga
                                               Pantheon Technologies SRO
                                                        October 25, 2014

               Conveying path setup type in PCEP messages
                  draft-ietf-pce-lsp-setup-type-00.txt

Abstract

   A Path Computation Element can compute traffic engineering paths (TE
   paths) through a network that are subject to various constraints.
   Currently, TE paths are label switched paths (LSPs) which are set up
   using the RSVP-TE signaling protocol.  However, other TE path setup
   methods are possible within the PCE architecture.  This document
   proposes an extension to PCEP to allow support for different path
   setup methods over a given PCEP session.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on April 28, 2015.

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Copyright Notice

   Copyright (c) 2014 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Path Setup Type TLV . . . . . . . . . . . . . . . . . . . . .   3
   4.  Operation . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   [RFC5440] describes the Path Computation Element Protocol (PCEP) for
   communication between a Path Computation Client (PCC) and a Path
   Control Element (PCE) or between one a pair of PCEs.  A PCC requests
   a path subject to various constraints and optimization criteria from
   a PCE.  The PCE responds to the PCC with a hop-by-hop path in an
   Explicit Route Object (ERO).  The PCC uses the ERO to set up the path
   in the network.

   [I-D.ietf-pce-stateful-pce] specifies extensions to PCEP that allow a
   PCC to delegate its LSPs to a PCE.  The PCE can then update the state
   of LSPs delegated to it.  In particular, the PCE may modify the path
   of an LSP by sending a new ERO.  The PCC uses this ERO to re-route
   the LSP in a make-before-break fashion.
   [I-D.ietf-pce-pce-initiated-lsp] specifies a mechanism allowing a PCE
   to dynamically instantiate an LSP on a PCC by sending the ERO and
   characteristics of the LSP.  The PCC signals the LSP using the ERO
   and other attributes sent by the PCE.

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