--> Err-Disabled is a Cisco feature which informs the administrator there is some problem in the interface or port.
--> When the port goes Err-Disabled State the port simply goes to shutdown state.
--> This Err-Disabled State may occur due to so many reasons like
i) LoopBack Error
ii) Port Security Violation
iii) Interface Flapping
iv) Spanning-Tree Issue ( BPDU Guard, BPDU Filter).
--> To know why the port went into Err-Disabled State, Simply use the following command.
# show interface status err-disabled
--> We can solver err-disabled state in two ways
i) Manually ( By Giving Shutdown / No shutdown command)
ii) Automatic ( By Configuring Errdisable recovery interval command)
--> When the port goes Err-Disabled State the port simply goes to shutdown state.
--> This Err-Disabled State may occur due to so many reasons like
i) LoopBack Error
ii) Port Security Violation
iii) Interface Flapping
iv) Spanning-Tree Issue ( BPDU Guard, BPDU Filter).
--> To know why the port went into Err-Disabled State, Simply use the following command.
# show interface status err-disabled
--> We can solver err-disabled state in two ways
i) Manually ( By Giving Shutdown / No shutdown command)
ii) Automatic ( By Configuring Errdisable recovery interval command)
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