Spanning-Tree Bpdufilter - Cisco Catalyst 4500 Series Command Reference Manual

Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches

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
Defaults
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:
•
•
•
OL-25342 -01
spanning-tree bpdufilter {enable | disable}
no spanning-tree bpdufilter
Enables BPDU filtering on this interface.
Disables BPDU filtering on this interface.
Modification
Support for 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.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0SG and IOS 15.1(1)SG)
spanning-tree bpdufilter
spanning-tree portfast bpdufilter default
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