With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cwdsiMnUptime
cwdsi Mn Uptime
1.3.6.1.4.1.9.9.509.1.3.1.1.14
This object specifies the value of sysUpTime at the time this Mobile Node registered with WDS.
Back to CISCO-WDS-INFO-MIB MIB page.
IPHost Network monitor allows you to monitor cwdsiMnUptime 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.