Enabling Backbonefast; Enabling Etherchannel Guard - Cisco 2950 - Catalyst Switch Configuration Manual

Configuring Optional Spanning-Tree Features
To disable CSUF on an interface, use the no spanning-tree stack-port interface configuration
command. To disable UplinkFast on the switch and all its VLANs, use the no spanning-tree uplinkfast
global configuration command.

Enabling BackboneFast

You can enable BackboneFast to detect indirect link failures and to start the spanning-tree
reconfiguration sooner.
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 enable 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.
Command
Step 1 configure terminal
Step 2
spanning-tree backbonefast
Step 3
end
Step 4 show spanning-tree summary
Step 5 copy running-config startup-config
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 that causes a loop.
You can enable this feature 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.
Command
Step 1
configure terminal
Step 2
spanning-tree etherchannel guard
misconfig
Step 3
end
Step 4 show spanning-tree summary
Step 5
copy running-config startup-config
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
16-18
Chapter 16 Configuring Optional Spanning-Tree Features
Purpose
Enter global configuration mode.
Enable BackboneFast.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enable EtherChannel guard.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
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