You can configure the router to use RADIUS or TACACS+ authentication, or both, to validate users who attempt to access the router using Telnet. If you configure both authentication methods, you also can configure which method to try first.
For TACACS+, the JUNOS software supports authentication, but does not support authorization.
When configuring system authentication, you can do the following:
For an example of configuring system authentication, see Examples: Configure System Authentication.