Re: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)

"John G. Scudder" <jgs@juniper.net> Mon, 24 October 2016 17:11 UTC

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From: "John G. Scudder" <jgs@juniper.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/EpAjjnrFl4n0g-MiH2ZiDYPSes4>
Subject: Re: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)
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Hi Everybody,

There has been a fair amount of debate about this sentence in the draft:

"   Global Administrator:  A four-octet namespace identifier.  This
     SHOULD be an Autonomous System Number."

Many of the objections can be summed up by saying "I can't program a router to enforce this rule". This is true, but as Brian has pointed out, it's hardly the first example of such a thing in a BGP spec. (Indeed, RFC 1997 says the equivalent community field "shall be encoded using an autonomous system number" but of course provides no enforcement mechanism.)

Other objections seem to be pursuing the question of whether it might be possible to revise the proposal to make the rule enforceable. Whether or not this is possible in principle seems beside the point since it would violate the "small and simple" 1997-equivalent goal of the proposal that was part of the consensus when the WG accepted it. 

After reviewing the mailing list discussion to date, it's the chairs' sense that consensus is trending towards keeping the text as written. As always, if you disagree with that consensus and feel you have something new to add to the discussion, please do.

Thanks,

--John and Sue