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Configuring the Switch
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3
• 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.
• Max hops – The max number of hop counts for the MST region.
• Remaining hops – The remaining number of hop counts for the MST instance.
• 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 3-68 STA Information
CLI
– This command displays global STA settings, followed by settings for each port
.
Console#show spanning-tree 4-186
Spanning-tree information
---------------------------------------------------------------
Spanning tree mode: MSTP
Spanning tree enable/disable: enable
Instance: 0
Vlans configuration: 1-4093
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
Max hops: 20
Remaining hops: 20
Designated Root 32768.0.0000ABCD0000
Current root port: 1
Current root cost 200000
Number of topology changes: 1
Last topology changes time (sec.): 13380