Our network was hiccuping more than a drunk epileptic throughout the day. It was still hosed when i left work. When i came home, i was greeted by almost 1000 messages in my work inbox, the glut of which were ping timeout alerts. Evidently, things were working again. The explanation and cure:
The packet storm that resulted in today's network outage appears to have been quashed by powering down all edge switches within the [building 1] and [building 2] LANs.
OH YEAH, BRING OUT THE FUCKING HAMMER, BABY!