PLANET WGSW-52040 - Manual (Page 344)

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19.1.26 spanning-tree mst rootguard
Command:
spanning-tree [mst ] rootguard
no spanning-tree [mst ] 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:
: 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.
Switch(config)#interface ethernet 1/2
Switch(Config-If-Ethernet1/2)#spanning-tree mst 0 rootguard
Switch(Config-If-Ethernet1/2)#
19.1.27 spanning-tree portfast
Command:
spanning-tree portfast [bpdufilter | bpduguard] [recovery <30-3600>]
no spanning-tree portfast