Spanning-Tree Bpdufilter - Cisco Catalyst 3550 Command Reference Manual

Multilayer switch

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spanning-tree bpdufilter

Use the spanning-tree bpdufilter interface configuration command to prevent a port from sending or

receiving bridge protocol data units (BPDUs). Use the no form of this command to return to the default

Syntax Description

BPDU filtering is disabled.

Command Modes

Interface configuration

Command History

Usage Guidelines

You can enable the BPDU filtering feature when the switch is operating in the per-VLAN spanning-tree

plus (PVST+), rapid-PVST+, or the multiple spanning-tree (MST) mode.

Enabling BPDU filtering on an interface is the same as disabling spanning tree on it and can result in

spanning-tree loops.

You can globally enable BPDU filtering on all Port Fast-enabled ports by using the spanning-tree

portfast bpdufilter default global configuration command.

You can use the spanning-tree bpdufilter interface configuration command to override the setting of

the spanning-tree portfast bpdufilter default global configuration command.

When you configure Layer 2 protocol filtering, the spanning-tree BPDU filtering feature is

automatically enabled on the port.

This example shows how to enable the BPDU filtering feature on a port:

Switch(config)# interface fastethernet0/1

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

You can verify your setting by entering the show running-config privileged EXEC command.

Catalyst 3550 Multilayer Switch Command Reference

spanning-tree bpdufilter {disable | enable}

no spanning-tree bpdufilter

Disable BPDU filtering on the specified interface.

Enable BPDU filtering on the specified interface.

Modification

This command was introduced.

Chapter 2 Catalyst 3550 Switch Cisco IOS Commands

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