With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoIfExtDot1dBaseMappingGroup
cisco If Ext Dot1d Base Mapping Group
1.3.6.1.4.1.9.9.276.2.2.7
A collection of objects containing mapping information about the ifIndex values of interfaces and their dot1dBasePort values.
Back to CISCO-IF-EXTENSION-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoIfExtDot1dBaseMappingGroup 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.