With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdsIfVlanRelayInfoOptCircuitIdTable
CISCO DHCP SNOOPING If Vlan Relay Info Option Circuit Id Table
1.3.6.1.4.1.9.9.380.1.3.5
Each entry in this table represent circuit-id information, configured on per port per vlan.
Back to CISCO-DHCP-SNOOPING-MIB MIB page.
IPHost Network monitor allows you to monitor cdsIfVlanRelayInfoOptCircuitIdTable 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.
