North American Network Operators Group
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Re: eigrp and managed ethernet

  • From: Stephen Kratzer
  • Date: Tue Sep 23 12:09:49 2008 
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.