mac

Commands for MSTP
235
17.1.27 spanning-tree port-priority
Command: spanning-tree port-priority <port-priority>
no spanning-tree port-priority
Function: Set the port priority; the command “no spanning-tree port-priority” restores
the default setting.
Parameter: <port-priority> sets port priority. The valid range is from 0 to 240. The value
should be the multiples of 16, such as 0, 16, 32, 48…240.
Command mode: Port Mode
Default: The default port priority is 32768.
Usage Guide: By setting the port priority to designated port. The lower the value of the
port priority is, the higher the priority is.
Example: Set the port priority as 4096 on the port 1.
Switch(Config-If-Ethernet1/1)#spanning-tree port-priority 4096
17.1.28 spanning-tree priority
Command: spanning-tree priority <bridge-priority>
no spanning-tree priority
Function: Configure the spanning-tree priority; the “no spanning-tree priority”
command restores the default priority.
Parameter: <bridge-priority> is the priority of the bridging switch. Its value should be
round times of 4096 between 0 and 61440, such as 0, 4096, 8192… 61440.
Command Mode: Global Mode.
Default: Priority is 32768.
Usage Guide: The bridge ID can be altered by changing the priority of the switch.
Further, the priority information can also be used for voting of the root bridge and the
specified ports. The bridge priority value of the switch is smaller, however the priority is
higher.
Example: Configure the priority is 4096.
Switch(config)#spanning-tree priority 4096
17.1.29 spanning-tree rootguard
Command: spanning-tree rootguard
no spanning-tree rootguard