With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
sdlcPortOperLastModifyTime
sdlc Port Operational Last Modify Time
1.3.6.1.2.1.41.1.1.2.1.11
This object describes the value of sysUpTime when this port definition was last modified. If the port has not been modified, then this value shall be zero.
Back to SNA-SDLC-MIB MIB page.
IPHost Network monitor allows you to monitor sdlcPortOperLastModifyTime 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.