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Catalyst 3560 Switch Command Reference
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Chapter 2 Catalyst 3560 Switch Cisco IOS Commands
spanning-tree bpduguard
spanning-tree bpduguard
Use the spanning-tree bpduguard interface configuration command to put an interface in the
error-disabled state when it receives a bridge protocol data unit (BPDU). Use the no form of this
command to return to the default setting.
spanning-tree bpduguard {disable | enable}
no spanning-tree bpduguard
Syntax Description
Defaults BPDU guard is disabled.
Command Modes Interface configuration
Command History
Usage Guidelines The BPDU guard feature provides a secure response to invalid configurations because you must
manually put the interface back in service. Use the BPDU guard feature in a service-provider network
to prevent an interface from being included in the spanning-tree topology.
You can enable the BPDU guard feature when the switch is operating in the per-VLAN spanning-tree
plus (PVST+), rapid-PVST+, or the multiple spanning-tree (MST) mode.
You can globally enable BPDU guard on all Port Fast-enabled interfaces by using the spanning-tree
portfast bpduguard default global configuration command.
You can use the spanning-tree bpduguard interface configuration command to override the setting of
the spanning-tree portfast bpduguard default global configuration command.
Examples This example shows how to enable the BPDU guard feature on a port:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# spanning-tree bpduguard enable
You can verify your setting by entering the show running-config privileged EXEC command.
disable Disable BPDU guard on the specified interface.
enable Enable BPDU guard on the specified interface.
Release Modification
12.1(19)EA1 This command was introduced.
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