I-D ACTION:draft-ietf-pce-pcecp-interarea-reqs-00.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element Working Group of the IETF.

	Title		: PCE Communication Protocol (PCECP) specific
                          requirements for Inter-Area (G)MPLS Traffic 
                          Engineering 
	Author(s)	: J. Le Roux
	Filename	: draft-ietf-pce-pcecp-interarea-reqs-00.txt
	Pages		: 19
	Date		: 2005-12-1
	
   For scalability purposes a network may comprise multiple IGP areas. 
   An inter-area TE-LSP is an LSP that transits through at least two IGP 
   areas. In a multi-area network, topology visibility remains local to 
   a given area, and a head-end LSR cannot compute alone an inter-area 
   shortest constrained path. One key application of the Path 
   Computation Element (PCE) architecture is the computation of inter-
   area TE-LSP paths. In this context, this document lists a detailed 
   set of PCE Communication Protocol (PCECP) specific requirements for 
   support of inter-area TE-LSP path computation. It complements generic 
   requirements for a PCE Communication Protocol. 

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-pce-pcecp-interarea-reqs-00.txt

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Liaison statement from ITU-T SG15

Hi,

There was a liaison to us from the recent meeting of Questions 12 and 14
of Study Group 15 of the ITU-T.

It was in response to our communication about the formation of the PCE
working group and the work we are doing. No further response from us is
required, but we will obviously keep the ITU-T in the loop as we go
forward.

You can see the liaison at the IETF's liaison tracker
https://datatracker.ietf.org/public/liaison_detail.cgi?detail_id=152

Thanks,
Adrian

I-D ACTION:draft-ietf-pce-architecture-03.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element Working Group of the IETF.

	Title		: Path Computation Element (PCE) Architecture
	Author(s)	: A. Farrel, et al.
	Filename	: draft-ietf-pce-architecture-03.txt
	Pages		: 37
	Date		: 2005-12-9
	
Constraint-based path computation is a fundamental building block for
   traffic engineering systems such as Multiprotocol Label Switching
   (MPLS) and Generalized Multiprotocol Label Switching (GMPLS)
   networks. Path computation in large, multi-domain, multi-region or
   multi-layer networks is complex and may require special
   computational components and cooperation between the different
   network domains.

   This document specifies the architecture for a Path Computation
   Element (PCE)-based model to address this problem space. This
   document does not attempt to provide a detailed description of all
   the architectural components, but rather it describes a set of
   building blocks for the PCE architecture from which solutions may be
   constructed.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-pce-architecture-03.txt

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Working Group Last call on draft-ietf-pce-architecture-03.txt

Hi,

A new revision of draft-ietf-pce-architecture has been edited  
addressing several comments related to the Policy aspects, which  
requires a new Working Group Last Call.

This email initiates a working group last call on draft-ietf-pce- 
architecture-03.txt.

The last call will end on January 3 at noon EST.

Please send your comments to the mailing list and copy the chairs.

Thanks.

JP.

Comment on draft-ietf-pce-pcecp-interarea-reqs-00.txt

<div>
<div>Hi, Jean-Louis</div>
<div>&nbsp;</div>
<div>&nbsp;I have some comment on the draft 
draft-ietf-pce-pcecp-interarea-reqs-00.txt</div>
<div>&nbsp;</div>
<div>&nbsp;In section 7.11.1, In case of network failure, jittering 
will be used to avoid</div>
<div>simultaneous requests sent to one PCE.&nbsp;Could more 
consideration be given here to</div>
<div>the preemptment, becouse the jittering timeout is stochastic, 
some lower request</div>
<div>may be served before a higher request and the path may be 
calculated differently.</div>
<div>which may increase the probability&nbsp;of a 
preemptment.</div>
<div>&nbsp;</div>
<div>&nbsp;I have always been thinking a question: if a PCC will 
not perform the CSPF&nbsp;</div>
<div>computation, why does it still maintain the TEDB any longer? 
which may consume </div>
<div>a lot of memory and CPU of a LSR.This 
question dost not aid&nbsp;at this draft.</div>
<div>&nbsp;</div>
<div>&nbsp;In inter-area environment,sometimes, 
a PCC may wish to get as many paths as possible,</div>
<div>for all kinds of purpose,so could the PCC send the request to more than one PCEs? </div>
<div>&nbsp;</div>
<div>Regards,</div>
<div>Zhang </div>
</div>

I-D ACTION:draft-ietf-pce-comm-protocol-gen-reqs-03.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element Working Group of the IETF.

	Title		: PCE Communication Protocol Generic Requirements
	Author(s)	: J. Le Roux, J. Ash
	Filename	: draft-ietf-pce-comm-protocol-gen-reqs-03.txt
	Pages		: 22
	Date		: 2005-12-28
	
The PCE model is described in the "PCE Architecture" document and
   facilitates path computation requests from Path Computation Clients
   (PCCs) to Path Computation Elements (PCEs).  This document specifies
   generic requirements for a communication protocol between PCCs and
   PCEs, and also between PCEs where cooperation between PCEs is
   desirable.  Subsequent documents will specify application-specific
   requirements for the PCE communication protocol.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-pce-comm-protocol-gen-reqs-03.txt

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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element Working Group of the IETF.

	Title		: PCE Communication Protocol Generic Requirements
	Author(s)	: J. Le Roux, J. Ash
	Filename	: draft-ietf-pce-comm-protocol-gen-reqs-03.txt
	Pages		: 22
	Date		: 2005-12-28
	
The PCE model is described in the "PCE Architecture" document and
   facilitates path computation requests from Path Computation Clients
   (PCCs) to Path Computation Elements (PCEs).  This document specifies
   generic requirements for a communication protocol between PCCs and
   PCEs, and also between PCEs where cooperation between PCEs is
   desirable.  Subsequent documents will specify application-specific
   requirements for the PCE communication protocol.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-pce-comm-protocol-gen-reqs-03.txt

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RE: I-D ACTION:draft-ietf-pce-comm-protocol-gen-reqs-03.txt

Hi All,

Please review and comment on the updated version of the PCE
communications protocol (PCECP) generic requirements I-D
http://www.ietf.org/internet-drafts/draft-ietf-pce-comm-protocol-gen-req
s-03.txt.

Per our agreements at IETF-64 (see JL's slide at
http://www3.ietf.org/proceedings/05nov/slides/pce-11/sld7.htm), the
referenced requirements in the inter-area PCECP requirements draft have
been moved into the generic PCECP requirements draft.  In particular,

- Section 6.1.17 'Objective Functions Supported' was added
- Section 6.3.4 'LSP Rerouting & Reoptimization' was updated

Our objective is to start a WG last call soon.  We look forward to your
review and comments.

Thanks,
Regards,
Jerry

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Subject: I-D ACTION:draft-ietf-pce-comm-protocol-gen-reqs-03.txt 

A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Path Computation Element Working Group
of the IETF.

	Title		: PCE Communication Protocol Generic
Requirements
	Author(s)	: J. Le Roux, J. Ash
	Filename	: draft-ietf-pce-comm-protocol-gen-reqs-03.txt
	Pages		: 22
	Date		: 2005-12-28
	
The PCE model is described in the "PCE Architecture" document and
   facilitates path computation requests from Path Computation Clients
   (PCCs) to Path Computation Elements (PCEs).  This document specifies
   generic requirements for a communication protocol between PCCs and
   PCEs, and also between PCEs where cooperation between PCEs is
   desirable.  Subsequent documents will specify application-specific
   requirements for the PCE communication protocol.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-pce-comm-protocol-gen-req
s-03.txt