Spanning-Tree Portfast Bpdufilter Default - Cisco 4500M Command Reference Manual

spanning-tree portfast bpdufilter default

spanning-tree portfast bpdufilter default
To enable the BPDU filtering by default on all PortFast ports, use the spanning-tree portfast 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.
Defaults
BPDU filtering is disabled.
Command Modes
Global configuration
Command History Release
12.1(12c)EW
Usage Guidelines
The spanning-tree portfast bpdufilter default command enables BPDU filtering globally on the
Catalyst4500 series switch. BPDU filtering prevents a port from sending or receiving any BPDUs.
You can override the effects of the spanning-tree portfast bpdufilter default command by configuring
BPDU filtering at the interface level.
Note
Be careful when enabling BPDU filtering. Functionality is different when enabling on a per-port basis
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 Catalyst4500 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
This example shows how to enable BPDU filtering by default:
Switch(config)# spanning-tree portfast bpdufilter default
Switch(config)#
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
2-442
spanning-tree portfast bpdufilter default
no spanning-tree portfast bpdufilter default
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches
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