Cisco Systems N3KC3064TFAL3 Enabling BPDU Filtering on Specified Interfaces, bpdufilter, Step

Configuring STP Extensions

Configuring STP Extensions

Enabling BPDU Filtering on Specified Interfaces

You can apply BPDU Filtering to specified interfaces. When enabled on an interface, that interface does not send any BPDUs and drops all BPDUs that it receives. This BPDU Filtering functionality applies to the entire interface, whether trunking or not.

Caution Be careful when you enter the spanning-tree bpdufilter enable command on specified interfaces. Explicitly configuring BPDU Filtering on a port that is not connected to a host can result in bridging loops as the port will ignore any BPDU it receives and go to forwarding.

You can enter this command to override the port configuration on specified interfaces.

This command has three states:

•spanning-tree bpdufilter enable—Unconditionally enables BPDU Filtering on the interface.

•spanning-tree bpdufilter disable—Unconditionally disables BPDU Filtering on the interface.

•no spanning-treebpdufilter—Enables BPDU Filtering on the interface if the interface is in operational edge port and if you configure the spanning-tree port type edge bpdufilter default command.

Note When you enable BPDU Filtering locally on a port, this feature prevents the device from receiving or sending BPDUs on this port.

Before You Begin

Ensure that STP is configured.

Procedure

	Command or Action	Purpose
Step 1	switch# configure terminal	Enters configuration mode.
Step 2	switch(config)# interface type	Specifies the interface to configure, and enters the
	slot/port	interface configuration mode.
Step 3	switch(config-if)# spanning-tree	Enables or disables BPDU Filtering for the specified
	bpdufilter {enable disable}	spanning tree edge interface. By default, BPDU Filtering
		is disabled.
Step 4	switch(config-if)# no spanning-tree	(Optional)
	bpdufilter	Disables BPDU Filtering on the interface.
		Note	Enables BPDU Filtering on the interface if the
			interface is an operational spanning tree edge
			port and if you enter the spanning-tree port type
			edge bpdufilter default command.

Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)

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