On Apr 17, 2012, at 6:49 PM, Ross Walker rswwalker@gmail.com wrote:
Just a shot in the dark here.
Take a look at the NIC and switch port flow control status during an outage, they may be paused due to switch load.
Is there anything else on the network switches that might flood them every half hour for a two minute duration?
Let me also add that constant spanning tree convergence can cause this too. Make sure your choice of protocol and priority suit your topology and equipment.
-Ross