Spanning-Tree Guard Root - Cisco 300 Series Cli Manual

Stackable managed switches

Hide thumbs Also See for 300 Series:

Table of Contents

Spanning-Tree Commands

OL-32830-01 Command Line Interface Reference Guide

{filtering | flooding}

spanning-tree bpdu

no spanning-tree bpdu

filtering—Specifies that BPDU packets are filtered when the spanning tree

is disabled on an interface.

flooding—Specifies that untagged BPDU packets are flooded

unconditionally (without applying VLAN rules) to ports with the spanning

tree disabled and BPDU handling mode of flooding. Tagged BPDU packets

are filtered.

Default Configuration

spanning-tree bpdu (Global)

Command Mode

Interface (Ethernet, Port Channel) Configuration mode

The following example defines the BPDU packet as flooding when the spanning

tree is disabled on

switchxxxxxx(config)#

switchxxxxxx(config-if)#

46.15 spanning-tree guard root

use the spanning-tree guard root Interface (Ethernet, Port Channel) Configuration

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.

spanning-tree guard root

no spanning-tree guard root

command determines the default configuration.

spanning-tree bpdu flooding