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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.
Switch(config)#interface ethernet 1/2
Switch(Config-If-Ethernet1/2)#spanning-tree mst 0 rootguard
Switch(Config-If-Ethernet1/2)#
12.1.19 spanning-tree portfast
Command: spanning-tree portfast [bpdufilter | bpduguard]
no spanning-tree portfast
Function: Set the current port as boundary port, and BPDU filter、BPDU guard as
specified mode or default mode ; the command ―no spanning-tree portfast‖ sets the
current port as non-boundary port.
Parameter: bpdufilter: configure the border port mode as BPDU filter;
bpduguard: configure the border port mode as BPDU guard.
Command mode: Port Mode
Default: All the ports are non-boundary ports by default when enabling MSTP.
Usage Guide: When a port is set to be a boundary port, the port converts its status from
discarding to forwarding without bearing forward delay. Once the boundary port receives
the BPDU, the port becomes a non-boundary port.
Example: Configure the border port mode as BPDU filter.
Switch(config)#interface ethernet 1/2
Switch(Config-If-Ethernet1/2)#spanning-tree portfast bpdufilter
Switch(Config-If-Ethernet1/2)#
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