[176194] in North American Network Operators' Group
Overlay as a link
daemon@ATHENA.MIT.EDU (Glen Kent)
Wed Nov 19 02:03:11 2014
X-Original-To: nanog@nanog.org
Date: Wed, 19 Nov 2014 12:33:02 +0530
From: Glen Kent <glen.kent@gmail.com>
To: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
Hi,
When youre doing overlay networking, i.e., you have tunnels from one
virtual machine in a DC to another in another DC, then can i consider a
tunnel between the two virtual machines as a "physical link" that exists in
a regular network?
I am wondering on what possibly can be the difference between a tunnel
being considered as a link and a true physical link.
I could run routing algorithms on both. The tunnel would only be considered
as an interface. Or i could run BFD on both.
Once difference that i can think of is that while you can send multiple
frames together on a tunnel (for example if there are ECMP paths within the
tunnel), you may not be able to send multiple frames at the same time on a
physical link. Anything else?
Glen
