I have never seen this kind of activity on the switches.
All of the lights on all of the LayerII 100Mb switches were flashing in unison at about 2 blinks per second. That's like 48X8 lights.
The 1Gig backbone switch lights were doing the same thing except it was more like 10 or 15 blinks per second. During this time, we lost network connectivity (due to timeouts) for about two minutes. The Chaos then subsided with techs running around offering educated guesses of WTF was going on....

I turned the light out in the Data Center and Enjoyed the Show.

Unfortunately, there was no realtime scans in place to catch any packets or connections, but I kicked LAN hound off and it found that there was much multicast traffic and a couple of network nodes on the same machines that had the same IP addresses for each node. That was about it. At first, I thought it could be the SSH Xploit since our Firewall runs a Linux kernel, but that is just a partially pheasible guess............Does this sound like an ARP flood?
In my career history, I have never seen such light activity on switches as this morning................