Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 850

Authentication Method RADIUS VTY access-class support? YES Username access-class support? NO The system provides several ways to configure access classes for VTY lines, including: • VTY Line Local Authentication and Authorization • VTY Line Remote Authentication and Authorization Remote authorization support? YES VTY Line Local Authentication and Authorization The system retrieves the access class from the local database. To use this feature: 1. Create a username. 2. Enter a password. 3. Assign an access class. 4. Enter a privilege level. You can assign line authentication on a per-VTY basis; it is a simple password authentication, using an access-class as authorization. Configure local authentication globally and configure access classes on a per-user basis. The system can assign different access classes to different users by username. Until users attempt to log in, the system does not know if they will be assigned a VTY line. This means that incoming users always see a login prompt even if you have excluded them from the VTY line with a deny-all access class. After users identify themselves, the system retrieves the access class from the local database and applies it. (The system can then close the connection if a user is denied access.) NOTE: If a VTY user logs in with RADIUS authentication, the privilege level is applied from the RADIUS server only if you configure RADIUS authentication. The following example shows how to allow or deny a Telnet connection to a user. Users see a login prompt even if they cannot log in. No access class is configured for the VTY line. It defaults from the local database. NOTE: For more information, refer to Access Control Lists (ACLs). Example of Configuring VTY Authorization Based on Access Class Retrieved from a Local Database (Per User) Dell(conf)#user gooduser password abc privilege 10 access-class permitall Dell(conf)#user baduser password abc privilege 10 access-class denyall Dell(conf)# Dell(conf)#aaa authentication login localmethod local Dell(conf)# Dell(conf)#line vty 0 9 Dell(config-line-vty)#login authentication localmethod Dell(config-line-vty)#end VTY Line Remote Authentication and Authorization The system retrieves the access class from the VTY line. The Dell Networking OS takes the access class from the VTY line and applies it to ALL users. The system does not need to know the identity of the incoming user and can immediately apply the access class. If the authentication method is RADIUS, TACACS +, or line, and you have configured an access class for the VTY line, the system immediately applies it. If the access-class is set to deny all or deny for the incoming subnet, the system closes the connection without displaying the login prompt. The Security 850