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BPDU guard - err-disabled port

Hi,

I have BPDU guard on all my access ports on the network.  I dont usually allow hubs to be plugged in but i need to allow a netgear hub to connect to one of my ports for a short time.  I set the port to default configuration so it doesnt have BPDU guard enabled but when i plug the netgear into it it still error disables the port.  Any ideas whats wrong - is it something thats configured on the netgear?

Also - i do not have port security enabled anywhere on this switch.

regards,

Kevin

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Accepted Solutions
Cisco Employee

BPDU guard - err-disabled port

Hi Kevin,

Check whether you have the BPDU Guard enabled globally using the spanning-tree portfast bpduguard default global configuration command. If that is the case then on the individual port, the BPDU Guard can be disabled using the spanning-tree bpduguard disable command.

If the port is indeed err-disabled thanks to the BPDU Guard (check the cause of the err-disabled state using the show interfaces status err-disabled command) then the NetGear must be sending its own BPDUs, or there must be some other switch connected to it that sends the offending BPDUs.

Best regards,

Peter

2 REPLIES
Cisco Employee

BPDU guard - err-disabled port

Hi Kevin,

Check whether you have the BPDU Guard enabled globally using the spanning-tree portfast bpduguard default global configuration command. If that is the case then on the individual port, the BPDU Guard can be disabled using the spanning-tree bpduguard disable command.

If the port is indeed err-disabled thanks to the BPDU Guard (check the cause of the err-disabled state using the show interfaces status err-disabled command) then the NetGear must be sending its own BPDUs, or there must be some other switch connected to it that sends the offending BPDUs.

Best regards,

Peter

New Member

BPDU guard - err-disabled port

Exactly right - BPDU guard was also enabled globally on the switch.  As soon as i removed that everything was fine.

regards,

Kevin

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