Dell PowerConnect 3424P Command Line Interface (CLI) Guide (.htm) - Page 335
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###### MST 0 Vlans Mapped: 1-9, 21-4094 CST Root ID 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 Age 20 sec Forward Delay 15 sec Max hops 20 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 DELL CONFIDENTIAL - PRELIMINARY 9/13/06 - FOR PROOF ONLY Spanning-Tree Commands 335
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