EtherChannel Guard is a way of finding out if one end of the EtherChannel is not configured properly. This could be that there are some parameters not matching up such as duplex and speed. Or it could be that one side is a trunk and the other isn’t.
When there is a misconfiguration found, the switch will place the interfaces in error-disabled state and an error will be displayed.
Configuration
To enable EtherChannel Guard, issue the global command:
SW1(config)#spanning-tree etherchannel guard misconfig
Verification
SW1#show spanning-tree summary Switch is in pvst mode Root bridge for: none Extended system ID is enabled Portfast Default is disabled PortFast BPDU Guard Default is disabled Portfast BPDU Filter Default is disabled Loopguard Default is disabled EtherChannel misconfig guard is enabled UplinkFast is disabled BackboneFast is disabled Configured Pathcost method used is short Name Blocking Listening Learning Forwarding STP Active ---------------------- -------- --------- -------- ---------- ---------- Total 0 0 0 0 0
To view any disabled interfaces issue the show command:
show interfaces status err-disabled
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