With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cDhcpv4SrvStartTime
Cisco IETF Dynamic Host Configuration protocol Srv Start Time
1.3.6.1.4.1.9.10.122.1.1.1
The time when the process supporting this server was started.
Back to CISCO-IETF-DHCP-SERVER-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cDhcpv4SrvStartTime 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.