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Re: [Pce] Mirja Kühlewind's No Objection on draft-ietf-pce-stateful-pce-18: (with COMMENT)

Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com> Tue, 11 April 2017 11:00 UTC

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From: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>
To: Mirja Kühlewind <ietf@kuehlewind.net>
CC: "draft-ietf-pce-stateful-pce@ietf.org" <draft-ietf-pce-stateful-pce@ietf.org>, Julien Meuric <julien.meuric@orange.com>, "pce-chairs@ietf.org" <pce-chairs@ietf.org>, "julien.meuric@orange.com" <julien.meuric@orange.com>, "pce@ietf.org" <pce@ietf.org>, The IESG <iesg@ietf.org>
Thread-Topic: Mirja Kühlewind's No Objection on draft-ietf-pce-stateful-pce-18: (with COMMENT)
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Date: Tue, 11 Apr 2017 11:00:04 +0000
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Subject: Re: [Pce] Mirja Kühlewind's No Objection on draft-ietf-pce-stateful-pce-18: (with COMMENT)
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Hi Mirja

Many thanks for your comment.  I'm picking up this thread and replying as PCE working group chair, as the authors are unavailable.  I apologise for the delay.

It is possible for a PCC or a stateful PCE not to support updates and still to advertise the STATEFUL-PCE-CAPABILITY TLV.  This scenario is called a "passive stateful PCE".  A passive stateful PCE does not update LSP state, but it does still synchronize LSP state with its PCCs, which allows it to take account of dependencies with existing LSPs when calculating paths for new LSPs (for example, to avoid two LSPs traversing the same link).  It is discussed in section 5.8.1.

Best regards
Jon


-----Original Message-----
From: Mirja Kühlewind [mailto:ietf@kuehlewind.net] 
Sent: 14 March 2017 12:22
To: The IESG <iesg@ietf.org>
Cc: draft-ietf-pce-stateful-pce@ietf.org; Julien Meuric <julien.meuric@orange.com>; pce-chairs@ietf.org; julien.meuric@orange.com; pce@ietf.org
Subject: Mirja Kühlewind's No Objection on draft-ietf-pce-stateful-pce-18: (with COMMENT)

Mirja Kühlewind has entered the following ballot position for
draft-ietf-pce-stateful-pce-18: No Objection

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Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-pce-stateful-pce/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Minor comment:
The U flag in the STATEFUL-PCE-CAPABILITY TLV is probably not necessary as the presents of this TVL already indicates that updates are supported; however not an issue.

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