Cisco Systems 3130 User Manual

19-17

Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide

OL-13270-01

Chapter 19 Configuring Optional Spanning-Tree Features

Configuring Optional Spanning-Tree Features

Note

If you use BackboneFast, you must enable it on all switches in the network. BackboneFast is not
supported on Token Ring VLANs. This feature is supported for use with third-party switches.

You can configure the BackboneFast feature for rapid PVST+ or for the MSTP, but the feature remains
disabled (inactive) until you change the spanning-tree mode to PVST+.

Beginning in privileged EXEC mode, follow these steps to enable BackboneFast. This procedure is
optional.

To disable the BackboneFast feature, use the no spanning-tree backbonefast global configuration
command.

Enabling EtherChannel Guard

You can enable EtherChannel guard to detect an EtherChannel misconfiguration if your switch is
running PVST+, rapid PVST+, or MSTP.

Beginning in privileged EXEC mode, follow these steps to enable EtherChannel guard. This procedure
is optional.

To disable the EtherChannel guard feature, use the no spanning-tree etherchannel guard misconfig
global configuration command.

You can use the show interfaces status err-disabled privileged EXEC command to show which switch
ports are disabled because of an EtherChannel misconfiguration. On the remote device, you can enter
the show etherchannel summary privileged EXEC command to verify the EtherChannel configuration.

After the configuration is corrected, enter the shutdown and no shutdown interface configuration
commands on the port-channel interfaces that were misconfigured.

Command

Purpose

Step 1

configure terminal

Enter global configuration mode.

Step 2

spanning-tree backbonefast

Enable BackboneFast.

Step 3

end

Return to privileged EXEC mode.

Step 4

show spanning-tree summary

Verify your entries.

Step 5

copy running-config startup-config

(Optional) Save your entries in the configuration file.