[pim] review of draft-ietf-pim-null-register-packing-06

Leonard Giuliano <lenny@juniper.net> Wed, 16 December 2020 20:54 UTC

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Date: Wed, 16 Dec 2020 12:54:52 -0800
From: Leonard Giuliano <lenny@juniper.net>
To: <pim@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pim/BugYBB4Fni1Wc_vQVtNjbI4J7Nk>
Subject: [pim] review of draft-ietf-pim-null-register-packing-06
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I reviewed the Null-Register packing draft and found it to be a 
well-written, concise and clear doc specifying a very simple optimization. 
Very much appreciate the brevity of this doc.  A few very minor (mostly 
editorial) nits, plus one question:

-sect2, 1st para, last sentence: "when it learns RP is capable"
 	-learns the RP

-sect8, last sentence: "the number of records should be limited to the MTU 
of the outgoing interface."
 	-might be more appropriate to say "limited by the MTU"

-sect9, 2nd para, last sentence: "these messages are not required for 
PIM-SSM."
 	-'required' implies they could be optionally used in SSM, so it 
might be better to say "these messages are not used in PIM-SSM."

-sect9, 3rd para, 1st sentence: "case where a spoof Register can be sent"
 	-"spoofed Register message"


-sect9, 3rd para, 2nd sentence: "This can cause Null-Registers to not be 
received by the RP."
 	-might be better to say "This can cause packed Null-Registers to 
be sent to an RP that doesnt support this packed format."

-sect9, 3rd para, 3rd sentence: consider revising this sentence.  Maybe 
something like "For example, uRPF can be used to filter spoofed packets."

-Sect6: this recommendation seems equally applicable to Anycast RP with 
MSDP for the same reasons as it is being recommended for Anycast RP with 
PIM.

Substantive question: could there ever be a case where an RP might need to 
send Register-stops for only a subset of the s-g pairs that were in the 
packet null-register message?  I couldn't think of a reason, but thought 
I'd ask.

-Lenny