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STP_spanning-tree bpdufilter(from cisco)

Cisco 林志斌 995浏览

spanning-tree bpdufilter

To enable BPDU filtering on an interface, use the spanning-tree bpdufilter command. To return to the default settings, use the no form of this command.

spanning-tree bpdufilter {enable | disable}

no spanning-tree bpdufilter

Syntax Description

enable

Enables BPDU filtering on this interface.

disable

Disables BPDU filtering on this interface.

Defaults

BPDU filtering is disabled.

Command Modes

Interface configuration

Command History

Release

Modification

12.1(12c)EW

Support for this command was introduced on the Catalyst 4500 series switch.

Usage Guidelines


Caution Use care when entering the spanning-tree bpdufilter enable command. Enabling BPDU filtering on an interface is approximately equivalent to disabling the spanning tree for this interface. It is possible to create bridging loops if this command is not correctly used.


When configuring Layer 2 protocol tunneling on all the service provider edge switches, you must enable spanning tree BPDU filtering on the 802.1Q tunnel ports by entering the spanning-tree bpdufilter enable command.

BPDU filtering allows you to prevent a port from sending and receiving BPDUs. The configuration is applicable to the whole interface, whether it is trunking or not. This command has three states:

?spanning-tree bpdufilter enable—This state unconditionally enables the BPDU filter feature on the interface.

?spanning-tree bpdufilter disable—This state unconditionally disables the BPDU filter feature on the interface.

?no spanning-tree bpdufilter—This state enables the BPDU filter feature on the interface if the interface is in operational PortFast state and if the spanning-tree portfast bpdufilter default command is configured.

Examples

This example shows how to enable the BPDU filter feature on this interface:

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

转载请注明:林志斌 » STP_spanning-tree bpdufilter(from cisco)

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