Configuring Backbonefast; Enabling Backbonefast; Displaying Backbonefast Statistics - Cisco WS-C2950SX-48-SI Configuration Manual

Chapter 8 Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, and Loop Guard
This example shows how to disable UplinkFast on the switch and restore the default bridge priority, port
cost, and port-VLAN cost values:
Console> (enable) clear spantree uplinkfast
This command will cause all portcosts, portvlancosts, and the
bridge priority on all vlans to be set to default.
Do you want to continue (y/n) [n]? y
VLANs 1-1005 bridge priority set to 32768.
The port cost of all bridge ports set to default value.
The portvlancost of all bridge ports set to default value.
uplinkfast all-protocols field set to off.
uplinkfast disabled for bridge.
Console> (enable) show spantree uplinkfast
uplinkfast disabled for bridge.
Console> (enable)

Configuring BackboneFast

The following sections describe how to configure the BackboneFast feature on the switch.

Enabling BackboneFast

You must enable BackboneFast on all switches in the network. BackboneFast is not supported on Token
Note
Ring VLANs. This feature is supported for use with third-party switches.
To enable BackboneFast on the switch, perform this task in privileged mode:
Task
Step 1
Enable BackboneFast on the switch.
Step 2 Verify that BackboneFast is enabled.
This example shows how to enable BackboneFast on the switch and how to verify the configuration:
Console> (enable) set spantree backbonefast enable
Backbonefast enabled for all VLANs
Console> (enable) show spantree backbonefast
Backbonefast is enabled.
Console> (enable)

Displaying BackboneFast Statistics

To display BackboneFast statistics, perform this task in privileged mode:
Task
Display BackboneFast statistics.
78-15486-01
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
Command
set spantree backbonefast enable
show spantree backbonefast
Command
show spantree summary
Configuring BackboneFast
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Release 8.1
8-17