Step 1:Configure AAA Authentication
Configure AAA authentication on the firewall to enable authentication of users who attempt to access the firewall. This can be done using the following commands:
aaa authentication login default group tacacs+ local
aaa authentication enable default group tacacs+ enable
These commands configure the firewall to use the TACACS+ server for authentication, and fall back to local authentication if the TACACS+ server is not available.
Step 2:Configure the TACACS+ Server
Next, configure the TACACS+ server on the firewall. This involves specifying the IP address of the TACACS+ server and configuring a shared secret key. This can be done using the following commands:
tacacs-server host <ip-address> key <shared-secret-key>
<ip-address> with the IP address of the TACACS+ server, and
<shared-secret-key> with the secret key that is used to authenticate communication between the firewall and the TACACS+ server.
Step 3:Configure the TACACS+ Server for Authorization
Configure the TACACS+ server to provide authorization for users who have been authenticated. This involves creating a user account on the TACACS+ server and specifying the access privileges for the user. This can be done using the following commands:
username <username> privilege <privilege-level> password <password>
<username> with the name of the user,
<privilege-level> with the level of access that the user should have (e.g. 15 for full access), and
<password> with the password for the user.
Step 4:Test the Configuration
Test the configuration by attempting to log in to the firewall using the credentials of a user who has been configured on the TACACS+ server. If the configuration is successful, the user should be able to log in and access the resources that they have been authorized to access.