How To Blink a Port On a Cisco Switch?
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1. Configure a VLAN on the switch in which you want to configure port blinking by entering the command “vlan [vlan_number]“.
2. Assign the port to the VLAN with the command “int [port_number]“.
3. Enter privileged mode with the command “enable“.
4. Type the command “config t“ to enter the global configuration mode.
5. Set the flash mode to port–based with the command “interface vlan [vlan_number]“.
6. Set the flash rate with the command “rate [rate_value]“. 7. Apply the configuration with the command “end“ and save the changes with the command “copy running–config startup–config“.
8. To start port blinking, type the command “interface [port_number]“.
9. Set the port to flash with the command “switchport port–security aging time [time_value]“.
10. To stop the port blinking, use the command “no switchport port–security aging time“.