Spanning-Tree Commands 465
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DELL CONFIDENTIAL – PRELIMINARY 5/15/12 - FOR PROOF ONLY
Default Configuration
The spanning-tree bpdu (Global) command determines the default
configuration.
Command Mode
Interface Configuration (Ethernet, Port-channel) mode
Example
The following example defines the BPDU packet as flooding when the
spanning tree is disabled on gigabitethernet port
1/0/
3.
Console(config)#
interface
gigabitethernet 1/0/3
Console(config-if)#
spanning-tree bpdu flooding
spanning-tree guard root
use the spanning-tree guard root Interface Configuration (Ethernet, Port-
channel) mode command to enable root guard on all spanning-tree instances
on the interface. Root guard prevents the interface from becoming the root
port of the device. Use the no form of this command to disable the root guard
on the interface.
Syntax
spanning-tree guard root
no spanning-tree guard root
Default Configuration
Root guard is disabled.
Command Mode
Interface Configuration (Ethernet, Port-channel) mode
User Guidelines
Root guard can be enabled when the device operates in STP, RSTP and MSTP
modes.
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