Cisco 4500M Command Reference

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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches
spanning-tree backbonefast
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.
spanning-tree backbonefast
no spanning-tree backbonefast
Syntax Description This command has no arguments or keywords.
Defaults BackboneFast is disabled.
Command Modes Global configuration
Command History
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
Release Modification
12.1(8a)EW Support for this command was introduced on the Catalyst 4500 series switch.

Cisco 4500M Specifications

General

Brand	Cisco
Model	4500M
Category	Network Router
Language	English