Cisco Catalyst 4500 Series Configuration Manual page 1078

spanning-tree bpdufilter
spanning-tree bpdufilter
To enable BPDU filtering on an interface, use the spanning-tree bpdufilter command. To return to the
default settings, use the no form of this command.
Syntax Description
enable
disable
Command Default Disabled
Command Modes
Interface configuration mode
Command History Release
12.1(12c)EW
Usage Guidelines
Use care when entering the spanning-tree bpdufilter enable command. Enabling BPDU filtering on an
Caution
interface is approximately equivalent to disabling the spanning tree for this interface. It is possible to
create bridging loops if this command is not correctly used.
When configuring Layer 2 protocol tunneling on all the service provider edge switches, you must enable
spanning-tree BPDU filtering on the 802.1Q tunnel ports by entering the spanning-tree bpdufilter
enable command.
BPDU filtering allows you to prevent a port from sending and receiving BPDUs. The configuration is
applicable to the whole interface, whether it is trunking or not. This command has three states:
•
•
•
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release XE 3.9.xE and 15.2(5)Ex
2-1028
spanning-tree bpdufilter {enable | disable}
no spanning-tree bpdufilter
Enables BPDU filtering on this interface.
Disables BPDU filtering on this interface.
Modification
This command was introduced on the Catalyst 4500 series switch..
spanning-tree bpdufilter enable—This state unconditionally enables the BPDU filter feature on
the interface.
spanning-tree bpdufilter disable—This state unconditionally disables the BPDU filter feature on
the interface.
no spanning-tree bpdufilter—This state enables the BPDU filter feature on the interface if the
interface is in operational PortFast state and if the
command is configured.
spanning-tree portfast edge bpdufilter default
Chapter 2