With IPHost Network Monitor you can run simple snmp requests against a HP device in your network.
stpPortState
stp Port State
1.3.6.1.4.1.11.2.14.3.6.15.2
The state of a port on a 2 port bridge is really the state of the bridge itself. Management is only allowed to set this object to 'stpDisabled' or 'stpBlocking'. Setting the object to 'stpDisabled' will turn off spanning tree only if the state is not 'stpBlocking' (to prevent loops). Setting the object to 'stpBlocking' will turn on spanning tree only if it was previously disabled. see: IEEE 802.1(d) 6.8.2.1.3(2), 4.4, 4.5.5.2
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IPHost Network monitor allows you to monitor stpPortState on Hewlett Packard 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.