Re: [trill] Eric Rescorla's No Objection on draft-ietf-trill-multilevel-unique-nickname-06: (with COMMENT)

Donald Eastlake <> Tue, 13 March 2018 03:49 UTC

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From: Donald Eastlake <>
Date: Mon, 12 Mar 2018 23:49:01 -0400
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To: Eric Rescorla <>
Cc: The IESG <>,, Susan Hares <>,, trill IETF mailing list <>
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Subject: Re: [trill] Eric Rescorla's No Objection on draft-ietf-trill-multilevel-unique-nickname-06: (with COMMENT)
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Hi Eric,

On Thu, Mar 8, 2018 at 9:27 AM, Eric Rescorla <> wrote:
> Eric Rescorla has entered the following ballot position for
> draft-ietf-trill-multilevel-unique-nickname-06: No Objection
> ...
> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> In the security considerations,  isn't the requirement not that you configure
> IS-IS authentication but that you actually have to require it on receipt? Or
> are these the same things.

I must admit that the current wording just talks about inclusion of
authentication TLVs in a way which seems to leave out checking them

The wording should be improved.

> Even with ordinary trill, can't you just spoof a lot of announcements with
> other people's nicknames? Why is this different?

Well, it is a bit more complex with IS-IS. It depends on just what you
try to spoof. If you spoof an announcement from some existing RBridge,
as soon as it is flooded to the claimed source RBridge that RBridge
will issue an overwritting announcement or purge. But, unless you turn
on appropriate security, there are ways to spoof announcements that
would have bad effects.

 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 155 Beaver Street, Milford, MA 01757 USA