Cisco Catalyst 4500 Series Configuration Manual page 1107

Chapter 2
spanning-tree portfast edge bpdufilter default
To enable the BPDU filtering by default on all PortFast edge ports, use the spanning-tree portfast edge
bpdufilter default command. To return to the default settings, use the no form of this command.
Syntax Description
This command has no keywords or arguments.
Command Default BPDU filtering is disabled.
Command Modes Global configuration mode
Command History Release
12.1(12c)EW
3.8.0E and 15.2.(4)E
Usage Guidelines The spanning-tree portfast edge bpdufilter default command enables BPDU filtering globally on the
Catalyst 4500 series switch. BPDU filtering prevents a port from sending or receiving any BPDUs.
You can override the effects of the spanning-tree portfast edge bpdufilter default command by
configuring BPDU filtering at the interface level.
Be careful when enabling BPDU filtering. Functionality is different when enabling on a per-port basis
Note
or globally. When enabled globally, BPDU filtering is applied only on ports that are in an operational
PortFast state. Ports still send a few BPDUs at linkup before they effectively filter outbound BPDUs. If
a BPDU is received on an edge port, it immediately loses its operational PortFast status and BPDU
filtering is disabled.
When enabled locally on a port, BPDU filtering prevents the Catalyst 4500 series switch from receiving
or sending BPDUs on this port.
Caution Be careful when using this command. This command can cause bridging loops if not used correctly.
Examples The following example shows how to enable BPDU filtering by default:
Switch(config)# spanning-tree portfast edge bpdufilter default
Switch(config)#
spanning-tree portfast edge bpdufilter default
no spanning-tree portfast edge bpdufilter default
Modification
This command was introduced on the Catalyst 4500 series switch.
Support for the edge keyword was introduced.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release XE 3.9.xE and 15.2(5)Ex
spanning-tree portfast edge bpdufilter default
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