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Chapter 8
Configuring Spanning Tree PortFast, UplinkFast, and BackboneFast, and Loop Guard
Figure 8-5
Switch C
Configuring BackboneFast
These sections describe how to configure the BackboneFast feature:
•
•
•
Enabling BackboneFast
Note
You must enable BackboneFast on all switches in the network. BackboneFast is not supported on Token
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)
78-12647-02
Adding a Switch in a Shared-Medium Topology
Blocked port
Enabling BackboneFast, page 8-13
Displaying BackboneFast Statistics, page 8-14
Disabling BackboneFast, page 8-14
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
Switch A
(Root)
Added switch
Command
set spantree backbonefast enable
show spantree backbonefast
Configuring BackboneFast
Switch B
(Designated Bridge)
8-13
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Troubleshooting
