There was something screwy relating to multicast in the router core. Acording to our internet bandwidth chart we're back to normal. From an overheard discussion I've heard that the traffic was originating from a pair of routers and the telecom crew was going to take Steps to isolate the buildings connected to the two routers. Things may have gone offline already, which would account for our speed-up.
I hope to learn exactly what went wrong.
I hope to learn exactly what went wrong.