PLANET XGS3-24042 - Manual (Page 270)

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Switch(config)#spanning-tree priority 4096
14.1.28 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.
Default:
Port is non-root port.
Command Mode:
Port Mode
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-Ethernet1/0/1)#spanning-tree rootguard
14.1.29 spanning-tree tcflush (Global mode)
Command:
spanning-tree tcflush {enable| disable| protect}
no spanning-tree tcflush
Function:
Configure the spanning-tree flush mode once the topology changes. “no spanning-tree tcflush”
restores to default setting.
Parameter:
enable: The spanning-tree flush once the topology changes.
disable: The spanning tree don’t flush when the topology changes.
protect: the spanning-tree flush not more than one time every ten seconds.