Cisco me 3400 Guida Al Software

Beginning in privileged EXEC mode, follow these steps to globally enable the BPDU filtering feature. 
This procedure is optional.

To disable BPDU filtering, use the no spanning-tree portfast bpdufilter default global configuration 
command. 

You can override the setting of the no spanning-tree portfast bpdufilter default global configuration 
command by using the spanning-tree bpdufilter enable interface configuration command on an STP 
port.

You can enable EtherChannel guard to detect an EtherChannel misconfiguration if your switch is 
running PVST+, rapid PVST+, or MSTP. 

Beginning in privileged EXEC mode, follow these steps to enable EtherChannel guard. This procedure 
is optional. 

Enter global configuration mode.

Globally enable BPDU filtering. (By default, BPDU filtering is 
disabled.)

Globally enabling BPDU filtering enables it only on STP 
ports; the command has no effect on UNIs or ENIs on 
which STP is not enabled.

interface interface-id

Specify the interface connected to an end station, and enter 
interface configuration mode. 

If the interface is a UNI, before you enable Port Fast, you must 
change the port type to NNI or ENI to enable STP:

Enter the port-type nni interface configuration command to 
change the port to an NNI with STP enabled by default.

Or enter the port-type eni and spanning-tree interface 
configuration commands to configure the port as an ENI STP 
port.

Enable the Port Fast feature.

Return to privileged EXEC mode.

Verify your entries.

(Optional) Save your entries in the configuration file.

Enter global configuration mode.

Enable EtherChannel guard.

Return to privileged EXEC mode.

Verify your entries.

(Optional) Save your entries in the configuration file.