HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP Co - Page 504

spanning-tree uplinkfast Chapter 2 Cisco Catalyst Blade Switch 3020 for HP Cisco IOS Commands Do not enable the root guard on interfaces that will be used by the UplinkFast feature. With UplinkFast, the backup interfaces (in the blocked state) replace the root port in the case of a failure. However, if root guard is also enabled, all the backup interfaces used by the UplinkFast feature are placed in the root-inconsistent state (blocked) and prevented from reaching the forwarding state. If you set the max-update-rate to 0, station-learning frames are not generated, so the spanning-tree topology converges more slowly after a loss of connectivity. Examples This example shows how to enable UplinkFast: Switch(config)# spanning-tree uplinkfast You can verify your setting by entering the show spanning-tree summary privileged EXEC command. Related Commands Command show spanning-tree summary spanning-tree vlan root primary Description Displays a summary of the spanning-tree interface states. Forces this switch to be the root switch. 2-476 Cisco Catalyst Blade Switch for HP Command Reference OL-8916-01