Name: Cisco 4500M
Brand: Cisco
Rating: 5 (1 reviews)

To Next Page

To Previous Page

2-422

Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW

78-16201-01

Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches

spanning-tree bpduguard

To enable BPDU guard on an interface, use the spanning-tree bpduguard command. To return to the

default settings, use the no form of this command.

spanning-tree bpduguard {enable | disable}

no spanning-tree bpduguard

Syntax Description

Defaults BPDU guard is disabled.

Command Modes Interface configuration

Command History

Usage Guidelines BPDU guard is a feature that prevents a port from receiving BPDUs. This feature is typically used in a

service provider environment where the administrator wants to prevent an access port from participating

in the spanning tree. If the port still receives a BPDU, it is put in the ErrDisable state as a protective

measure. This command has three states:

• spanning-tree bpduguard enable—This state unconditionally enables BPDU guard on the

interface.

• spanning-tree bpduguard disable—This state unconditionally disables BPDU guard on the

interface.

• no spanning-tree bpduguard—This state enables BPDU guard on the interface if it is in the

operational PortFast state and if the spanning-tree portfast bpduguard default command is

configured.

Examples This example shows how to enable BPDU guard on this interface:

Switch(config-if)# spanning-tree bpduguard enable

Switch(config-if)#

Related Commands show spanning-tree

spanning-tree portfast bpduguard default

enable Enables BPDU guard on this interface.

disable Disables BPDU guard on this interface.

Release Modification

12.1(12c)EW Support for this command was introduced on the Catalyst 4500 series switch.

Cisco 4500M Command Reference

Other manuals for Cisco 4500M