*Update*

There appears to be a serious failure in the distribution switch. The situation has been escalated to Cisco support.
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Previous Description (2010-05-03 20:45:50):

A major network distribution switch in Botterell Hall has rebooted. The cause is unknown. ITServices staff are investigating.

Networks in Botterell, Louise D Acton,Abramsky and houses on Barrie St. south of Biosciences are affected.