PLANET WGSW-52040 - Manual (Page 347)

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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
19.1.30 spanning-tree rootguard
Command:
spanning-tree rootguard
no spanning-tree rootguard
Function:
Set the port is root port, “no spanning-tree rootguard” command sets the port is non-root port.
Parameter:
None.
Command mode:
Port Mode.
Default:
Port is non-root port.
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:
Set the port 1 is root port.
Switch(Config-If-Ethernet1/1)#spanning-tree rootguard