Re: [Idr] draft-walton-bgp-hostname-capability-00

Jeffrey Haas <jhaas@pfrc.org> Wed, 20 May 2015 14:41 UTC

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Date: Wed, 20 May 2015 10:42:03 -0400
From: Jeffrey Haas <jhaas@pfrc.org>
To: Daniel Walton <dwalton@cumulusnetworks.com>
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Subject: Re: [Idr] draft-walton-bgp-hostname-capability-00
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On Fri, May 15, 2015 at 09:26:16PM -0400, Daniel Walton wrote:
> https://tools.ietf.org/html/draft-walton-bgp-hostname-capability-00
> 
> Feedback is welcome. There is a "Sectino" typo in the intro, will clean
> that up.

At John's request, here is a short list of things I find problematic about
this draft.  Note that this isn't a statement of my opinion on the value of
it.

1. The draft really should require the ext-opt-param feature.  It's too easy
for a hostname to eat all of the capability space.
2. You can't rely on the hostname in question being useful for DNS purposes.
The IPv6 link local peering is just one example of why.
3. The specification should offer some guidance about what to do when you
have multiple peering sessions with a given router.
4. The specification should offer some guidance about what to do when two
distinct routers use the same name.

Note that 3 and 4 can be distinguished based on BGP Identifier.

As for the UTF-8 issue, it's the right thing to do and as much as it makes
things a real mess, the draft wouldn't progress in IESG without I18N issues
being dealt with.

That said, carefully consider what you expect to do with the names returned
by such a feature.  Just because you can print the things, does that mean
the input portion of your UI can accept it?

-- Jeff (best I can do with anything that isn't Latin-1 is cut and paste)