2-520
Catalyst 3550 Multilayer Switch Command Reference
OL-8566-01
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
spanning-tree bpdufilter
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
setting.
spanning-tree bpdufilter {disable | enable}
no spanning-tree bpdufilter
Syntax Description
Defaults 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.
Caution 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.
Examples 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.
disable Disable BPDU filtering on the specified interface.
enable Enable BPDU filtering on the specified interface.
Release Modification
12.1(9)EA1 This command was introduced.
To Next Page
Loading...
Need help?
General
