HP procurve series 4100gl Management And Configuration Manual page 323

Syntax:
spanning-tree [ethernet] <port-list>
path-cost <1 - 200000000>
point-to-point-mac <force-true | force-false | auto>
priority <0 - 15>
[no] spanning-tree [ethernet] <port-list>
edge-port
mcheck
Defaults: see the table on the previous page.
Note on Path Cost
802.1w Rapid Spanning Tree Protocol (RSTP) and 802.1d Spanning Tree Protocol (STP)
RSTP implements a greater range of path costs and new default path cost
values to account for higher network speeds. These values are different than
the values defined by 802.1d STP as shown below.
Port Type 802.1d STP Path Cost
10 Mbps 100
100 Mbps 10
1 Gbps 5
10 Gbps ?
Because the maximum value for the path cost allowed by 802.1d STP is 65535,
devices running that version of spanning tree cannot be configured to match
the values defined by RSTP, at least for 10 Mbps and 100 Mbps ports. In LANs
where there is a mix of devices running 802.1d STP and RSTP, you should
reconfigure the devices so the path costs match for ports with the same
network speeds.
Configuring Rapid Reconfiguration Spanning Tree (RSTP)
Abbreviations:
span <port-list>
path <1 - 200000000>
forc <force-t | force-f | auto>
pri <0 - 15>
[no] span <port-list>
edge
mch
RSTP Path Cost
2 000 000
200 000
20 000
2000
13-15