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Re: Generic anycast addresses...

Fred Baker <fredbaker.ietf@gmail.com> Fri, 31 May 2019 00:14 UTC

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From: Fred Baker <fredbaker.ietf@gmail.com>
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Subject: Re: Generic anycast addresses...
Date: Thu, 30 May 2019 17:14:42 -0700
In-Reply-To: <D648647D-60E1-4DCE-B0BE-11002E0AE5A4@fugue.com>
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, Michael Richardson <mcr+ietf@sandelman.ca>, "6man@ietf.org" <6man@ietf.org>, Dave Thaler <dthaler@microsoft.com>
To: Ted Lemon <mellon@fugue.com>
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> On May 30, 2019, at 2:59 PM, Ted Lemon <mellon@fugue.com> wrote:
> 
> Do ULAs have a non-fuzzy scope boundary?

The recommendation of RFC 4193, if I understand it, is that advertisements of ULA prefixes in EBGP are "not announced", and if they happen to be announced by accident, are refused. https://tools.ietf.org/html/rfc4193#section-4.1.

That is in no sense a default. My primary expertise is with my former employer's equipment, but I believe this to be generally true: EBGP only advertises what it is told to, and refuses only what it is told to. Hence, I would guess that the typical configuration will not advertise a ULA in anything resembling a normal case, but will not refuse one that is advertised to it.

But the intended scope-boundary is "EBGP".
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