With IPHost Network Monitor you can run simple snmp requests against a HP device in your network.
stpRootCost
stp Root Cost
1.3.6.1.4.1.11.2.14.3.6.6
The cost of the path to the root bridge from this bridge; equal to the sum of the designated cost and the path cost held for the root port. see: IEEE 802.1(d) 6.8.1.1.3(6), 4.5.3.2
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IPHost Network monitor allows you to monitor stpRootCost 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.