With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
interfaceTopNTable
interface Top N Table
1.3.6.1.2.1.16.27.1.3
A table of reports for the top `N' ports based on setting of associated control table entries. The maximum number of entries depends on the number of entries in table interfaceTopNControlTable and the value of object interfaceTopNGrantedSize for each entry. For each entry in the interfaceTopNControlTable, interfaces with the highest value of interfaceTopNValue shall be placed in this table in decreasing order of that rate until there is no more room or until there are no more ports.
Back to INTERFACETOPN-MIB MIB page.
IPHost Network monitor allows you to monitor interfaceTopNTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.