[Last-Call] Genart last call review of draft-ietf-pim-igmp-mld-extension-05

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Reviewer: Pete Resnick
Review result: Ready with Issues

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-pim-igmp-mld-extension-05
Reviewer: Pete Resnick
Review Date: 2022-01-13
IETF LC End Date: 2022-01-19
IESG Telechat date: Not scheduled for a telechat

Summary: One possible minor issue and a couple of nits, but otherwise ready.

Major issues:

None.

Minor issues:

In section 3 it says,

   There is no alignment or padding.

Are you sure that implementations are going to work with this? In my old brain,
there are still memories of trying to read 16-bit values out of an odd-aligned
location caused all sorts of problems. Are you sure you don't want to at least
pad this to even lengths?

Nits/editorial comments:

In section 3, this sentence confused me for a moment:

   A previously reserved bit in the IGMPv3 and MLDv2 headers is used to
   indicate whether this extension is used.

I suggest:

   For each of the IGMPv3 and MLDv2 headers, a previously reserved bit
   is used to indicate the presence of this extension.

In section 3:

   When this extension
   mechanism is used, the number of Group Records in each Report message
   should be kept small enough that the entire message, including any
   extension TLVs can fit within the network MTU.

That "should" looks pretty interoperability-related to me. Perhaps "SHOULD"?



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