The Auxiliary (Aux) password in a Cisco router is a password used to secure access to the router's auxiliary port. The auxiliary port is an additional serial interface on the router that can be used for remote management, configuration, and troubleshooting.
By default, the auxiliary port has no password and anyone with physical access to the router can use it to gain access to the router's configuration and management features. To enhance security, you can set an Auxiliary password to restrict access to the auxiliary port.
To configure the Auxiliary password on a Cisco router, follow these steps:
Step 1: Access the router Connect to the router via console cable or remotely using SSH or Telnet.
Step 2: Enter global configuration mode To enter global configuration mode, type the following command:
Router# configure terminal
Step 3: Set the Auxiliary password To set the Auxiliary password, use the following command:
Router(config)# line aux 0
Router(config-line)# password PASSWORD
Router(config-line)# login
Replace PASSWORD with the password you want to set.
Step 4: Exit configuration mode To exit global configuration mode, type the following command:
Router(config-line)# exit
Router(config)# exit
Step 5: Save the configuration changes To save the configuration changes, type the following command:
Router# copy running-config startup-config
This command will save the running configuration to the startup configuration, which will ensure that the Auxiliary password is retained even after a reboot.
That's it! You have successfully configured the Auxiliary password on your Cisco router. Now, anyone trying to access the router through the Auxiliary port will be prompted to enter the password you set in order to gain access.
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