Dell PowerConnect M6220 Command Line Interface Guide - Page 130

www.dell.com | support.dell.com • The user password is saved internally in encrypted format and never appears in clear text anywhere on the CLI. • The CLI supports TACACS+ and Radius authentication servers. • The CLI allows the user to configure primary and secondary authentication servers. If the primary authentication server fails to respond within a configurable period, the CLI automatically tries the secondary authentication server. • The user can specify whether the CLI should revert to using local user accounts when the remote authentication servers do not respond or if the CLI simply fails the login attempt because the authentication servers are down. This requirement applies only when the user is login through a telnet or an SSH session. • The CLI always allows the user to log in to a local serial port even if the remote authentication server(s) are down. In this case, CLI reverts to using the locally configured accounts to allow the user to log in. User Access Control In addition to authenticating a user, the CLI also assigns the user access to one of three security levels. Level 1 has read-only access. This level allow the user to read information but not configure the switch. The access to this level cannot be modified. Level 14 has access to all functions within the switch except changing the mode. Level 15 is the special access level assigned to the superuser of the switch. This level has full access to all functions within the switch and can not be modified. If the user account is created and maintained locally, each user is given an access level at the time of account creation. If the user is authenticated through remote authentication servers, the authentication server is configured to pass the user access level to the CLI when the user is authenticated. When Radius is used, the Vendor-Specific Option field returns the access level for the user. Two vendor specific options are supported. These are CISCO-AV-Pairs(Shell:privlvl=x) and Dell Radius VSA (user-group=x). TACACS+ provides the appropriate level of access. The following rules and specifications apply: • The user determines whether remote authentication servers or locally defined user authentication accounts are used. • If authentication servers are used, the user can identify at least two remote servers (the user may choose to configure only one server) and what protocol to use with the server, TACACS+ or Radius. One of the servers is primary and the other is the secondary server (the user is not required to specify a secondary server). If the primary server fails to respond in a configurable time period, the CLI automatically attempts to authenticate the user with the secondary server. • The user is able to specify what happens when both primary and secondary servers fail to respond. In this case, the user is able to indicate that the CLI should either use the local user accounts or reject all requests. 130