[108071] in North American Network Operators' Group
Re: eigrp and managed ethernet
daemon@ATHENA.MIT.EDU (Stephen Kratzer)
Tue Sep 23 12:09:49 2008
From: Stephen Kratzer <kratzers@pa.net>
To: nanog@nanog.org
Date: Tue, 23 Sep 2008 12:07:55 -0400
In-Reply-To: <520409.69934.qm@web30806.mail.mud.yahoo.com>
Cc: nanog <nanog@merit.edu>
Reply-To: kratzers@pa.net
Errors-To: nanog-bounces@nanog.org
On Tuesday 23 September 2008 11:43:06 Philip Lavine wrote:
> For some reason when I lose layer 3 connectivity between two managed
> Ethernet sites EIGRP does not bounce.Is this because the physical interface
> does not bounce?
Because EIGRP hellos are sent via IP multicast, layer 3 connectivity is
required to establish and maintain adjacencies. However, layer 3 failures
aren't detected for, at most, 15 seconds by default on an Ethernet link.
Stephen Kratzer
Network Engineer
CTI Networks, Inc.
