How do I enable a port disabled by BPDU Guard?

[promanelka]

In packet tracer, I enabled the following command on a switchport connected to a PC.

interface f0/1
  spanning-tree portfast
  spanning-tree bpduguard enable

I removed the PC and connected a new switch on that same port (f0/1). And as expected the new switch started sending BPDU Hello messages, also as expected BPDU Guard kicked in and disabled the interface.

How do I enable this interface?

I've tried disabling the BPDU Guard STP feature with the command:

interface f0/1
  spanning-tree bpduguard disable
  no shutdown

to no avail.

What should I do to remove the link from an err-disabled state and make the link in an up/up state?

[Joseph W. Doherty]

Packer Tracer can be hit or miss as to its fidelity.  You may need to reload the device or even restart PT.

[liviu.gheorghe]

Have you tried shutdown and no shutdown of the interface`?

You can also try configuring automatic recovery from the err-disable state. In global config mode try the following commands:

errdisable recovery cause bpduguard

errdisable recovery interval 30

The interface should recover form err-disable in 30 seconds. Use the following command to verify:

show errdisable recovery

HTH