I've got monitoring setup on several devices in our office. The ping response time to small access switches is commonly 1-4ms... As of 3AM this morning, this has sky-rocketed to 300ms on average.
Where does one start looking in a situation like this? What things can I observe in the switch to find the source of latency?
NOTE: It's not load related.. all the links bandwidth usage is normal and unaffected, most links are very under utilized. Also - monitoring is local to the devices reporting the latency so there is no WAN factor here.