With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwIdleModeLocUpdtPowerDown
Cisco's ASN Gateway Idle Mode Location Update Power Down
1.3.6.1.4.1.9.9.638.1.3.1.1.1.108
The number of idlemode location update messages received by gateway because of MS power down.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwIdleModeLocUpdtPowerDown 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.