Configuring Rapid Reconfiguration Spanning Tree (RSTP)
Syntax: | Abbreviations: |
span < | |
path <1 - 200000000> | |
force < | |
priority < 0 - 15 > | pri <0 - 15> |
[no] | [no] span < |
edge | |
mcheck | mch |
Defaults: see the table on the previous page.
Note on Path Cost RSTP and MSTP implement 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 | RSTP and MSTP Path Cost |
10 Mbps | 100 | 2 000 000 |
100 Mbps | 10 | 200 000 |
1 Gbps | 5 | 20 000 |
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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 and MSTP, at least for 10 Mbps and 100 Mbps ports. In LANs where there is a mix of devices running 802.1D STP, RSTP, and/ or MSTP, you should reconfigure the devices so the path costs match for ports with the same network speeds.