
19-116
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
19.1.30 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.
Command mode:
Global mode