Spanning-Tree Bpduguard - Cisco Small Business 300 1.1 Series Administration Manual

Spanning-Tree Commands
78-20269-01 Command Line Interface Reference Guide
Example
The following example defines the BPDU packet as flooding when the spanning
tree is disabled on gi3
Console(config)#
interface gi3
Console(config-if)#

29.15 spanning-tree bpduguard

Use the spanning-tree bpduguard Interface Configuration (Ethernet, port-channel)
mode command to shut down an interface when it receives a bridge protocol data
unit (BPDU). Use the no form of this command to restore the default configuration.
Syntax
spanning-tree bpduguard
no spanning-tree bpduguard
Parameters
enable—Enables BPDU Guard.
disable—Disables BPDU Guard.
Default Configuration
BPDU Guard is disabled.
Command Mode
Interface Configuration (Ethernet, Port-channel) mode
User Guidelines
The command can be enabled when the spanning tree is enabled (useful when the
port is in the PortFast mode) or disabled.
Example
The following example shuts down gi5 when it receives a BPDU.
Console(config)# interface gi5
.
spanning-tree bpdu flooding
{enable | disable}
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