With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSTPStpMaxAge
Switch MSTP Stp Max Age
1.3.6.1.4.1.171.12.15.1.3
The value that all bridges use for MaxAge when this bridge is acting as the root. Note that the range for this parameter is related to the value of StpForwardDelay and PortAdminHelloTime. MaxAge <= 2(ForwardDelay - 1);MaxAge >= 2(HelloTime + 1) The granularity of this timer is specified by 802.1D-1990 to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds.
Back to MSTP-MIB MIB page.
IPHost Network monitor allows you to monitor swMSTPStpMaxAge 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 access points right now.