Spanning Tree Commands
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spanning-tree priority
This command configures the spanning tree priority globally for this switch. Use the
no form to restore the default.
Syntax
spanning-tree priority priority
no spanning-tree priority
priority - Priority of the bridge. (Range: 0 - 65535)
(Range – 0-61440, in steps of 4096; Options: 0, 4096, 8192, 12288,
16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152,
53248, 57344, 61440)
Default Setting
32768
Command Mode
Global Configuration
Command Usage
Bridge priority is used in selecting the root device, root port, and designated
port. The device with the highest priority (i.e., lower numeric value) becomes
the STA root device. However, if all devices have the same priority, the device
with the lowest MAC address will then become the root device.
Example
spanning-tree pathcost method
This command configures the path cost method used for Rapid Spanning Tree and
Multiple Spanning Tree. Use the no form to restore the default.
Syntax
spanning-tree pathcost method {long | short}
no spanning-tree pathcost method
• long - Specifies 32-bit based values that range from 1-200,000,000.
This method is based on the IEEE 802.1w Rapid Spanning Tree Protocol.
• short - Specifies 16-bit based values that range from 1-65535.
This method is based on the IEEE 802.1 Spanning Tree Protocol.
Default Setting
Long method
Command Mode
Global Configuration
Console(config)#spanning-tree priority 40000
Console(config)#
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