With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
csvdStateEntityRoleLastChange
csvd State Entity Role Last Change
1.3.6.1.4.1.9.9.775.1.5.1.3
This object indicates the value of sysUpTime the last time the corresponding instance of csvdStateEntityRole changed.
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IPHost Network monitor allows you to monitor csvdStateEntityRoleLastChange on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.