Spanning-Tree Backbonefast - Cisco 4500M Command Reference Manual

Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches

spanning-tree backbonefast

To enable BackboneFast on a spanning tree VLAN, use the spanning-tree backbonefast command. To
disable BackboneFast, use the no form of the command.
Syntax Description
This command has no arguments or keywords.
Defaults
BackboneFast is disabled.
Command Modes
Global configuration
Command History Release
12.1(8a)EW
Usage Guidelines
BackboneFast should be enabled on all Catalyst 4006 family switches to allow the detection of indirect
link failures. Enabling BackboneFast starts the spanning tree reconfiguration more quickly.
Examples
This example shows how to enable BackboneFast on all VLANs:
Switch(config)# spanning-tree backbonefast
Switch(config)#
Related Commands
spanning-tree cost
spanning-tree port-priority
spanning-tree portfast default
spanning-tree portfast (interface configuration mode)
spanning-tree uplinkfast
spanning-tree vlan
show spanning-tree
78-16201-01
spanning-tree backbonefast
no spanning-tree backbonefast
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
spanning-tree backbonefast
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