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Enhancements in Release F.04.08
Configuring Rapid Reconfiguration Spanning Tree (RSTP)
Note on Path Cost
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 in the
next table.
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.
Syntax: Abbreviations:
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
span <port-list>
path <1 - 200000000>
forc <force-t | force-f | auto>
pri <0 - 15>
[no] span <port-list>
edge
mch
Defaults: see the table on the previous page.
Port Type 802.1D STP Path Cost RSTP Path Cost
10 Mbps 100 2 000 000
100 Mbps 10 200 000
1 Gbps 5 20 000
10 Gbps ? 2000