It's hard to say exactly what you can do since I don't know what brand of Ethernet switch you are using. Many Cisco products will show you a 5 minute average utilization when you show int, but that usually only works on router ports, not switch ports. If your switch supports SNMP, the best bet is to setup one of the many network management systems available.
(Answered by Brandon Ross, VP of Operations, Sockeye Networks.)
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