Cisco Nexus 5000 Series Switch CLI Software Configuration Guide (OL-16597-01, July 2009)

Ensure that you have configured some spanning tree edge ports.
Procedure
PurposeCommand or Action
Enters configuration mode.switch# configure terminal
Step 1
Enables BPDU Filtering by default on all
operational spanning tree edge ports. Global BPDU
Filtering is disabled by default.
switch(config)# spanning-tree port type
edge bpdufilter default
Step 2
This example shows how to enable BPDU Filtering on all operational spanning tree edge ports:
switch# configure terminal
switch(config)# spanning-tree port type edge bpdufilter default
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.
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.
Caution
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-tree bpdufilter—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.
When you enable BPDU Filtering locally on a port, this feature prevents the device from receiving or
sending BPDUs on this port.
Note
Before You Begin
Ensure that STP is configured.
Procedure
PurposeCommand or Action
Enters configuration mode.switch# configure terminal
Step 1
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
208 OL-16597-01
About STP Extensions
Enabling BPDU Filtering on Specified Interfaces