With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cwdsiApLifeTime
cwdsi Ap Life Time
1.3.6.1.4.1.9.9.509.1.2.1.1.6
This object specifies the maximum time after which the registration of the Access Point with WDS expires. The Access Point must re-register before the lifetime is exhausted, otherwise it will be deleted from the table.
Back to CISCO-WDS-INFO-MIB MIB page.
IPHost Network monitor allows you to monitor cwdsiApLifeTime 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.