9 messages in net.nether.puck.cisco-nsp[c-nsp] Layer-2 Flapping log messages
FromSent OnAttachments
Robert WaltonJan 12, 2005 3:55 am 
Djerk GeurtsJan 12, 2005 4:18 am 
Hudson Delbert J Contr 61 CS/SCBNJan 12, 2005 11:22 am 
Todd, Douglas M.Jan 12, 2005 12:02 pm 
Stephen StuartJan 12, 2005 12:53 pm 
Douglas M. Todd, Jr.Jan 12, 2005 2:09 pm 
Stephen StuartJan 12, 2005 2:43 pm 
Arnold NipperJan 12, 2005 3:15 pm 
Robert WaltonJan 13, 2005 2:08 am 
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Subject:[c-nsp] Layer-2 Flapping log messages Actions...
From:Stephen Stuart (stu@tech.org)
Date:Jan 12, 2005 2:43:46 pm
List:net.nether.puck.cisco-nsp

Oops my bad - thx missed the first byte. This might help http://www.faqs.org/rfcs/rfc2338.html Possible two devices using vrrp?

DMT:

Good catch (I was wondering why that OUI looked familiar).

Robert:

It's possible that two devices have declared themselves VRRP master, because the multicast messages that they exchange to elect a master are getting filtered. The most common cause of this is IGMP snooping on the switch (multicast-based routing protocols don't manage their membership by IGMP); either disable IGMP snooping for the switch, or set whatever it is that tells the switch that routers are attached to those ports.

Stephen