With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdpCacheIfIndex
Cisco Discovery Protocol Cache If Index
1.3.6.1.4.1.9.9.23.1.2.1.1.1
Normally, the ifIndex value of the local interface. For 802.3 Repeaters for which the repeater ports do not have ifIndex values assigned, this value is a unique value for the port, and greater than any ifIndex value supported by the repeater; the specific port number in this case, is given by the corresponding value of cdpInterfacePort.
Back to CISCO-CDP-MIB MIB page.
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