Spanning-Tree Guard Root - Dell PowerConnect 3424 Cli Reference Manual

###### MST 0 Vlans Mapped: 1-9, 21-4094
CST Root ID

spanning-tree guard root

Use the spanning-tree guard root interface configuration command to enable root guard on all the
spanning tree instances on that interface. Root guard restricts the interface to be the root port for
the switch. Use the no form of this command to disable root guard on the interface.
Syntax
spanning-tree guard root
no spanning-tree guard root
Default Configuration
Root guard is disabled.
Command Modes
Interface configuration (Ethernet, port-channel).
User Guidelines
Root guard can be enabled when the switch works in STP, RSTP and MSTP.
When root guard is enabled, if spanning-tree calculations cause a port to be selected as the root
port, the port transitions to the alternate state.
Example
The following example enable root guard on port e8.
Console(config)# interface ethernet 1/e8
Console(config-if)# spanning-tree guard root
D E L L C O N F I D E N T I A L – P R E L I M I N A R Y 9 / 1 3 / 0 6 – F O R P R O O F O N LY
Priority 32768
Address 00:01:42:97:e0:00
This switch is root for CST and IST master.
Root Port 1 (1/e1)
Hello Time 2 sec
Max hops 20
Max Age 20 sec Forward Delay 15 sec
Spanning-Tree Commands
335