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How to recover cisco switch port from err-disable state

Port is in err-disable state? And you don't know what to do?

switch01#show int G1/0/19
GigabitEthernet1/0/19 is down, line protocol is down (err-disabled)

Find out the main reason for err-disable state. In our case it is port security violation on port Gi1/0/19.

#show interfaces status err-disabled
Port      Name               Status       Reason
Gi1/0/19  SERVER01    err-disabled psecure-violation
Gi1/0/46                     err-disabled psecure-violation
Gi2/0/12                     err-disabled psecure-violation

Fix port configuration:

int G1/0/19
 no switchport port-security
 shut
 no shut

Interface is in up/up state.

#show interfaces status err-disabled
Port      Name               Status       Reason
Gi1/0/46                     err-disabled psecure-violation
Gi2/0/12                     err-disabled psecure-violation

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