Enabling Backbonefast - Cisco Catalyst 3550 series Software Configuration Manual
Multilayer switch
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Also See for Catalyst 3550 series:
- Reference manual (58 pages) ,
- Datasheet (21 pages) ,
- Manual (19 pages)
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Configuring Optional Spanning-Tree Features
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.
The BackboneFast feature is supported only when the switch is running PVST+. It is not supported when
the switch is running rapid PVST+ or MSTP.
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
To disable the EtherChannel guard feature, use the no spanning-tree etherchannel guard misconfig
global configuration command.
Catalyst 3550 Multilayer Switch Software Configuration Guide
18-20
Chapter 18
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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