Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
spanning-tree backbonefast
spanning-tree b ackbonefast
To enable BackboneFast on a spanning-tree VLAN, use the spanning-tree backbonefast command. To
disable BackboneFast, use the no form of this command.
spanning-tree backbonef ast
no spanning-tree backbonefast
Syntax Description This command has no arguments or keywo rds.
Defaults Ba ckboneFast is disa bled.
Command Modes global c onfiguration mod e
Usage Guidelines B ackboneFast shou ld be enabled on all Catalys t 4506 series switches to allow the detection of indire ct
link failures. E nabling Backbon eFast starts the spanning- tree re configura tion more quickl y.
Examples This exampl e shows how to enable Backbone Fast on all VLANs:
Switch(config)# spanning-tree backbonefast
Switch(config)#
Related Commands Command Description
spanning-tree cost Calculates the path cost of STP on an interface.
spanning-tree portfast default E nables PortFast by default on all access ports.
spanning-tree portfast (interface
configuration mode)
Enables PortFast mode.
spanning-tree port-priority Prioritizes an interface when two bridges compete for
position as the root bridge.
spanning-tree uplinkfast Enables the UplinkFast feature.
spanning-tree vlan Configures STP on a per-VLAN basis.
show spanning-tree Displays spanning-tree information.