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Commands for MSTP
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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)#
17.1.26 spanning-tree portfast
Command: spanning-tree portfast [bpdufilter | bpduguard] [recovery <30-3600>]
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
recovery: configure the border port can be recovered automatically after
implement bpduguard violation operation
<30-3600>: the recovery time, do not recover it by default
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 guard, the recovery time as 60s.
Switch(config)#interface ethernet 1/2
Switch(Config-If-Ethernet1/2)#spanning-tree portfast bpduguard recovery 60
Switch(Config-If-Ethernet1/2)#