With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
portTopNGrantedSize
port Top N Granted Size
1.3.6.1.4.1.9.5.1.20.1.1.10
When the associated portTopNRequestedSize object is created or modified, the value of this object should be set as closely to the requested value as is possible for the particular implementation and available resources. The value must not be lowered except as a result of a set to the associated portTopNRequestedSize object. Ports with the highest value of portTopNRateBase shall be placed in this table in decreasing order of this rate until there is no more room or until there are no more ports.
Back to CISCO-STACK-MIB MIB page.
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