With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swAACEnableMethod4Type
Switch AAC Enable Method4 Type
1.3.6.1.4.1.171.12.5.4.1.8
The type of Enable method list. The group type includes tacas(1), xtacacs(2), tacacs-plus(3), radius(4) and server-group(5) for user specific. The keyword type includes local(6), local-enable(7), and none(8).
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IPHost Network monitor allows you to monitor swAACEnableMethod4Type on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link switches right now.