Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 629
RADIUS, RADIUS Authentication and Authorization
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To move to a lower privilege level, enter the command disable followed by the level-number you wish to set for the user in the EXEC Privilege mode. If you enter disable without a level-number, your security level is 1. RADIUS Remote Authentication Dial-In User Service (RADIUS) is a distributed client/server protocol. This protocol transmits authentication, authorization, and configuration information between a central RADIUS server and a RADIUS client (the Dell Force10 system). The system sends user information to the RADIUS server and requests authentication of the user and password. The RADIUS server returns one of the following responses: • Access-Accept-the RADIUS server authenticates the user • Access-Reject-the RADIUS server does not authenticate the user If an error occurs in the transmission or reception of RADIUS packets, the error can be viewed by enabling the debug radius command. Transactions between the RADIUS server and the client are encrypted (the users' passwords are not sent in plain text). RADIUS uses UDP as the transport protocol between the RADIUS server host and the client. For more information on RADIUS, refer to RFC 2865, Remote Authentication Dial-in User Service. RADIUS Authentication and Authorization FTOS supports RADIUS for user authentication (text password) at login and can be specified as one of the login authentication methods in the aaa authentication login command. When configuring AAA authorization, you can configure to limit the attributes of services available to a user. When authorization is enabled, the network access server uses configuration information from the user profile to issue the user's session. The user's access is limited based on the configuration attributes. RADIUS exec-authorization stores a user-shell profile and that is applied during user login. You may name the relevant named-lists with either a unique name or the default name. When authorization is enabled by the RADIUS server, the server returns the following information to the client: • Idle time • ACL configuration information • Auto-command • Privilege level After gaining authorization for the first time, you may configure these attributes. Note: RADIUS authentication/authorization is done for every login. There is no difference between first-time login and subsequent logins. Security | 629
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