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PCEP Extensions for Temporary Reservation of Computed Path Resources and Support for Limited Context State in PCE
draft-gonzalezdedios-pce-reservation-state-01

Document type: Expired Internet-Draft (individual)
Document stream: No stream defined
Last updated: 2012-09-10 (latest revision 2012-03-09)
Intended RFC status: Unknown
Other versions: (expired, archived): plain text, pdf, html

Stream State:No stream defined
Document shepherd: No shepherd assigned

IESG State: Expired
Responsible AD: (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:
http://www.ietf.org/archive/id/draft-gonzalezdedios-pce-reservation-state-01.txt

Abstract

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.

Authors

Oscar de Dios <ogondio@tid.es>
Ramon Casellas <ramon.casellas@cttc.es>
Cyril Margaria <cyril.margaria@nsn.com>
Young Lee <leeyoung@huawei.com>
Fatai Zhang <zhangfatai@huawei.com>

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)