Re: [Isis-wg] Fwd: New Version Notification for draft-franke-isis-over-ipv6-00.txt

Christian Franke <chris@opensourcerouting.org> Mon, 06 July 2015 19:04 UTC

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Date: Mon, 06 Jul 2015 21:04:02 +0200
From: Christian Franke <chris@opensourcerouting.org>
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To: Karsten Thomann <karsten_thomann@linfre.de>, isis-wg@ietf.org
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Subject: Re: [Isis-wg] Fwd: New Version Notification for draft-franke-isis-over-ipv6-00.txt
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Hello Karsten,

thank you for your input. I have made appropriate changes to the draft,
they can be seen here:
https://git.netdef.org/projects/OSR/repos/drafts/commits/8a6e90598a4ce

On 07/05/2015 10:37 PM, Karsten Thomann wrote:
> I'm not sure if we really need this encapsulation, as there are not many links layers left, but you 
> should at least mention that it avoids some problems with switches dropping ISIS LSPs if it's 
> encapsulated in IPv6

The homenet working group is currently in the process of selecting a
routing protocol to use. In that discussion some people voiced concern
that IS-IS would not be a good option since it was specified on top of
layer 2 instead of layer 3. This draft and the demo implementation were
done to address these concerns. On the one hand by showing that it
doesn't take much to run IS-IS on top of layer 3 and on the other hand
to provide a standardized way to do so, should the need arise.

I was not aware that switches existed which drop IS-IS PDUs, although
it's not that hard to imagine that there are switches which are broken
in that way. Could you name examples for switches showing this behavior?

-Christian