With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdeCircuitTable
Cisco DLSW Circuit Table
1.3.6.1.4.1.9.9.74.1.5.1
A list of circuits. Each new circuit will create a conceptual row in the table. When the circuit disconnects, the row will be deleted from the table. End station 1 (S1) and End station 2 (S2) are used to represent the two end stations of the circuit. S1 is always an end station which is locally attached. S2 may be locally attached or remote. This table augments the dlswCircuitTable.
Back to CISCO-DLSW-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cdeCircuitTable 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.