13-15
802.1w Rapid Spanning Tree Protocol (RSTP) and 802.1d Spanning Tree Protocol (STP)
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 below.
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>
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
!Software.book Page 15 Thursday, October 10, 2002 6:10 PM
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