With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mnAdvMaxRegLifetime
mn Adv Max Reg Lifetime
1.3.6.1.2.1.44.1.3.2.2.4
The longest lifetime in seconds that the agent is willing to accept in any registration request.
Back to MIP-MIB MIB page.
IPHost Network monitor allows you to monitor mnAdvMaxRegLifetime 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.