Subject: I-D Action: draft-gonzalezdedios-pce-reservation-state-01.txt

From: [email-masked]
Date: Fri, 09 Mar 2012 02:29:31 -0800

A New Internet-Draft is available from the on-line Internet-Drafts directories.

	Title           : PCEP Extensions for Temporary Reservation of Computed Path Resources and Support for Limited Context State in PCE
	Author(s)       : Oscar Gonzalez de Dios
                          Ramon Casellas
                          Cyril Margaria
                          Young Lee
                          Fatai Zhang
	Filename        : draft-gonzalezdedios-pce-reservation-state-01.txt
	Pages           : 20
	Date            : 2012-03-09

   The Path Computation Element (PCE) provides path computation
   functions in support of traffic engineering in Multi-Protocol Label
   Switching (MPLS) and Generalized MPLS (GMPLS) networks.

   A limited form of statefulness is useful to improve PCE functionality
   in situations in which the local TED might not be up to date, or in
   the case of concurrent requests where most of the LSPs are computed
   before the end of the set-up of the LSPs, when the TED is updated.
   The PCC is responsible to setup or not the TE-Path computed by the
   PCE.  By providing an indication that it intends to use the resources
   on the TE-Path a PCC can help the PCE to get a more accurate dynamic
   TED view and thus the PCE can avoid suggesting the use of the same
   resources for subsequent TE LSPs.

   This document proposes an extension to the PCEP protocol to allow the
   PCC to indicate to the PCE to block or reserve the resources computed
   in a path request of a TE LSP for subsequent requests for a certain
   time and can help to reduce the number of crankbacks.

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