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Switch(Config-If-Ethernet1/2)#spanning-tree mst 1 port-priority 32
6.1.23 spanning-tree mst priority
Command: spanning-tree mst <instance-id> priority <bridge-priority>
no spanning-tree mst <instance-id> priority
Function: Set the bridge priority for the specified instance; the command ―no
spanning-tree mst <instance-id> priority‖ restores the default setting.
Parameter: <instance-id> sets instance ID. The valid range is from 0 to 64;
<bridge-priority> sets the switch priority. The valid range is from 0 to 61440. The value
should be the multiples of 4096, such as 0, 4096, 8192…61440.
Command mode: Global Mode
Default: The default bridge priority is 32768.
Usage Guide: By setting the bridge priority, users can change the bridge ID for the
specified instance. And the bridge ID can influence the elections of root bridge and
designated port for the specified instance.
Example: Set the priority for Instance 2 to 4096.
Switch(config)#spanning-tree mst 2 priority 4096
6.1.24 spanning-tree mst rootguard
Command: spanning-tree [mst <instance-id>] rootguard
no spanning-tree [mst <instance-id>] rootguard
Function: Enable the rootguard function for specified instance, the rootguard function
forbid the port to be MSTP root port. ―no spanning-tree mst <instance-id> rootguard‖
disable the rootguard function.
Parameter: <instance-id>: MSTP instance ID.
Command mode: Port Mode.
Default: Disable rootguard function.
Usage Guide: The command is used in Port Mode, if the port is configured to be a
rootguand port, it is forbidden to be a MSTP root port. If superior BPDU packet is received
from a rootguard port, MSTP did not recalculate spanning-tree, and just set the status of
the port to be root_inconsistent (blocked).If no superior BPDU packet is received from a
blocked rootguard port, the port status will restore to be forwarding. The rootguard
function can maintain a relative stable spanning-tree topology when a new switch is added
to the network.
Example: Enable rootguard function for port 1/2 in instance 0.