Dell Force10 S25-01-GE-24V FTOS 8.4.2.7 Configuration Guide for E-Series TeraS - Page 948

www.dell.com | support.dell.com VTY Line and Access-Class Configuration Various methods are available to restrict VTY access in FTOS. These depend on which authentication scheme you use - line, local, or remote: Table 45-1. VTY Access Authentication Method Line Local TACACS+ RADIUS Username VTY access-class access-class support? support? YES NO NO YES YES NO YES NO Remote authorization support? NO NO YES (with FTOS 5.2.1.0 and later) YES (with FTOS 6.1.1.0 and later) FTOS provides several ways to configure access classes for VTY lines, including: • VTY Line Local Authentication and Authorization on page 948 • VTY Line Remote Authentication and Authorization on page 949 VTY Line Local Authentication and Authorization FTOS 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 Line authentication can be assigned on a per-VTY basis; it is a simple password authentication, using an access-class as authorization. Local authentication is configured globally. You configure access classes on a per-user basis. FTOS can assign different access classes to different users by username. Until users attempt to log in, FTOS 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. Once users identify themselves, FTOS retrieves the access class from the local database and applies it. (FTOS also subsequently can close the connection if a user is denied access). Figure 45-16 shows how to allow or deny a Telnet connection to a user. Users will see a login prompt, even if they cannot login. No access class is configured for the VTY line. It defaults from the local database. 948 | Security