With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
faVisitorTimeRemaining
fa Visitor Time Remaining
1.3.6.1.2.1.44.1.5.3.1.1.5
The number of seconds remaining until the registration is expired. It has the same initial value as faVisitorTimeGranted, and is counted down by the foreign agent.
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IPHost Network monitor allows you to monitor faVisitorTimeRemaining on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.