With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
interfaceTopNRequestedSize
interface Top N Requested Size
1.3.6.1.2.1.16.27.1.2.1.8
The maximum number of interfaces requested for the Top N Table. When this object is created or modified, the agent should set interfaceTopNGrantedSize as close to this object as is possible for the particular implementation and available resources.
Back to INTERFACETOPN-MIB MIB page.
IPHost Network monitor allows you to monitor interfaceTopNRequestedSize on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.