[Pce] Alissa Cooper's Discuss on draft-ietf-pce-association-diversity-12: (with DISCUSS and COMMENT)

Alissa Cooper via Datatracker <noreply@ietf.org> Wed, 30 October 2019 15:39 UTC

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Date: Wed, 30 Oct 2019 08:39:12 -0700
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Subject: [Pce] Alissa Cooper's Discuss on draft-ietf-pce-association-diversity-12: (with DISCUSS and COMMENT)
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Alissa Cooper has entered the following ballot position for
draft-ietf-pce-association-diversity-12: Discuss

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A couple of the points from the Gen-ART review warrant discussion I think
(quoting directly from the review):

(1) 'The relationship of this mechanism with SVEC seems to be important but
is not clearly stated.  The relevant sections of the text seem to be:
section 4 para 2, section 5.3, and section 5.4 from "[RFC5440] uses
SVEC diversity flag" on.  I think that they need to be pulled into one
section.  Then it will be possible to have a good description of the
interaction with SVEC.'

(2) 'The path computation effects of the P bit are described in the "P"
item in section 5.2 and section 5.5.  But the descriptions are
unclear, or perhaps they presume that there are only two LSPs in the
group.  I think the intended meaning is that all of the LSPs in the
group with P=1 are computed first, and then with those LSPs fixed, the
LSPs in the group with P=0 are computed.  This will cause
shortest-path constraints (and other objective functions) to be
optimized on the P=1 LSPs, and those paths will not be de-optimized by
competition from the other paths.  This should probably be pulled out
of the description of the "P" in its TLV and put into a separate


Please respond to the remainder of the Gen-ART review.