Configuring the Switch
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• Root Forward Delay – The maximum time (in seconds) this device will wait before
changing states (i.e., discarding to learning to forwarding). This delay is required
because every device must receive information about topology changes before it
starts to forward frames. In addition, each port needs time to listen for conflicting
information that would make it return to a discarding state; otherwise, temporary
data loops might result.
• Transmission limit – The minimum interval between the transmission of
consecutive RSTP/MSTP BPDUs.
• Path Cost Method – The path cost is used to determine the best path between
devices. The path cost method is used to determine the range of values that can
be assigned to each interface.
Web – Click Spanning Tree, STA, Information.
Figure 3-82 Displaying Spanning Tree Information
CLI
– This command displays global STA settings, followed by settings for each port
.
Note:
The current root port and current root cost display as zero when this device is not
connected to the network.
Console#show spanning-tree 4-217
Spanning-tree information
---------------------------------------------------------------
Spanning tree mode: RSTP
Spanning tree enabled/disabled: enabled
Priority: 32768
Bridge Hello Time (sec.): 2
Bridge Max Age (sec.): 20
Bridge Forward Delay (sec.): 15
Root Hello Time (sec.): 2
Root Max Age (sec.): 20
Root Forward Delay (sec.): 15
Designated Root: 32768.00177C0AC9F1
Current root port: 0
Current root cost: 0
Number of topology changes: 1
Last topology changes time (sec.):2262
Transmission limit: 3
Path Cost Method: long
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