With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoPingSerialNumber
cisco Ping Serial Number
1.3.6.1.4.1.9.9.16.1.1.1.1
Object which specifies a unique entry in the ciscoPingTable. A management station wishing to initiate a ping operation should use a pseudo-random value for this object when creating or modifying an instance of a ciscoPingEntry. The RowStatus semantics of the ciscoPingEntryStatus object will prevent access conflicts.
Back to CISCO-PING-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoPingSerialNumber 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.