Last Call Review of draft-ietf-anima-grasp-09
review-ietf-anima-grasp-09-genart-lc-halpern-2017-02-25-00

Request Review of draft-ietf-anima-grasp
Requested rev. no specific revision (document currently at 15)
Type Last Call Review
Team General Area Review Team (Gen-ART) (genart)
Deadline 2017-03-02
Requested 2017-02-16
Other Reviews Intdir Early review of -09 by Charles Perkins (diff)
Opsdir Last Call review of -12 by Joel Jaeggli (diff)
Secdir Last Call review of -09 by Barry Leiba (diff)
Tsvart Telechat review of -11 by Martin Stiemerling (diff)
Secdir Telechat review of -11 by Barry Leiba (diff)
Genart Telechat review of -11 by Joel Halpern (diff)
Artart Telechat review of -11 by Martin Thomson (diff)
Genart Telechat review of -12 by Joel Halpern (diff)
Review State Completed
Reviewer Joel Halpern
Review review-ietf-anima-grasp-09-genart-lc-halpern-2017-02-25
Posted at https://mailarchive.ietf.org/arch/msg/gen-art/d3D_RIyoMNDEULkmnYruV2qJVOY
Reviewed rev. 09 (document currently at 15)
Review result Ready with Nits
Last updated 2017-02-25

Review
review-ietf-anima-grasp-09-genart-lc-halpern-2017-02-25

I am the assigned Gen-ART reviewer for this draft. The General Area
Review Team (Gen-ART) reviews all IETF documents being processed
by the IESG for the IETF Chair.  Please treat these comments just
like any other last call comments.

For more information, please see the FAQ at

<https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.

Document: draft-ietf-anima-grasp-??
Reviewer: Joel Halpern
Review Date: 2017-02-25
IETF LC End Date: 2017-03-02
IESG Telechat date: Not scheduled for a telechat

Summary:

Major issues:

Minor issues:
     Section 2.2 states that routing protocols mainly consider link up/down and that "all nodes need a consistent view of the network topology".  the first seems an over-generalization, since all routing protocols have metrics, and almost all modern routing protocols carry significant additional information about the links and nodes.  The second statement about consistency is true for some protocols, but is not true for external use of BGP nor, as I understand it, for Babel.  So it seems again too strong a characterization.  The following sentence about information not normally used also seems to be at odds with current practice.

    Bullet 1 under SN7 in section 2.2  talks about the potential for circular dependence, and then says that this protocol will not provide any assistance for that.  given that such dependence may be complex.  In particular, given that these dependencies result in separate negotiations, the chain of efforts would continue even if the initial impetus has timed out.  If a single negotiation causes two dependent negotiations, this would seem to have the potential to cause a work explosion.

    It is probably considered obvious, but I did not see text indicating that GRASP messages with unknown MESSAGE_TYPE should be silently ignored.  Or any other definition of the expected behavior (should be logged?)

Nits/editorial comments: 
    In section 3.1 in the definition of Technical Objective the text starts by saying that it is a configurable parameter or set of parameters.   Most further text refers to a single value, with indications that the value may be a complex structure.  Hence, in the first part of the definition, the same construction should be used, rather than referring to a set of values.  This gets slightly confused when section 3.10.4 goes back to talking about multiple parameters for an objective.  Consistency please?

    The first paragraph of 3.5.4.1 states that upon receiving a discovery request, a recipient will respond, either with the data or with a divert.  While this is eventually true, it is misleading.  As 3.5.4.2 states, the recipient, if it does not have an answer, will relay the request in order to get an answer.  Some mention of this in 3.5.4.1 would seem helpful.

    Should the first line of 3.5.5 on negotiation include "(using M_REQ_NEG)"?