It's easy to find the short term utilization by looking at the 'show int' command. By default Cisco tells you the 5 minute average utilization. If you want a longer term picture of how much bandwidth you are using, you can use the counters to determine an average utilization over longer periods of time. Simply do a 'clear count' at some point, wait for however long of a period that you want to know the utilization for, then divide the total bytes by the number of seconds since you cleared the counters (which 'show int' will also tell you). Now this will be in bytes/sec so you may want to divide by 8 to get bits/sec.
(Answered by Brandon Ross, VP of Operations, Sockeye Networks.)
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