OME LinkDown Repeated Messages

Hi -

I am seeing repeated alerts for about 6 hours now to one of our networks (not every server on the network) that the LinkDown port: 15.  According to the logs the 3 servers affected go down every so often and then come back up.  Each server has been up and has no network connectivity issues.  I've tried restarting the services on each server as well as the main OME server.  It's not an issue with the infrastructure as we are not having any issues with the servers' connectivity themselves.  Also no errors in the event logs to explain issues with the NIC's.  Any thoughts on what to look for or try?

Thanks.