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xStack
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ACCESS AUTHENTICATION CONTROL COMMANDS
The Access Authentication Control commands allows secure access to the Switch using the TACACS / XTACACS / TACACS+ and RADIUS protocols. When a user logs in to the Switch or tries to access the administrator level privilege, he or she is prompted for a password. If TACACS / XTACACS / TACACS+ / RADIUS authentication is enabled on the Switch, it will contact a TACACS / XTACACS / TACACS+ / RADIUS server to verify the user. If the user is verified, he or she is granted access to the Switch.
There are currently three versions of the TACACS security protocol, each a separate entity. The Switch’s software supports the following versions of TACACS:
•TACACS (Terminal Access Controller Access Control System)
•Extended TACACS (XTACACS) — An extension of the TACACS protocol with the ability to provide more types of authentication requests and more types of response codes than TACACS. This protocol also uses UDP to transmit packets.
•TACACS+ (Terminal Access Controller Access Control System plus) — Provides detailed access control for authentication for network devices. TACACS+ is facilitated through Authentication commands via one or more centralized servers. The TACACS+ protocol encrypts all traffic between the Switch and the TACACS+ daemon, using the TCP protocol to ensure reliable delivery.
The Switch also supports the RADIUS protocol for authentication using the Access Authentication Control commands. RADIUS or Remote Authentication Dial In User Server also uses a remote server for authentication and can be responsible for receiving user connection requests, authenticating the user and returning all configuration information necessary for the client to deliver service through the user. RADIUS may be facilitated on this Switch using the commands listed in this section.
In order for the TACACS / XTACACS / TACACS+ security function to work properly, a TACACS / XTACACS / TACACS+ server must be configured on a device other than the Switch, called a server host and it must include usernames and passwords for authentication. When the user is prompted by the Switch to enter usernames and passwords for authentication, the Switch contacts the TACACS / XTACACS / TACACS+ server to verify, and the server will respond with one of three messages:
A)The server verifies the username and password, and the user is granted normal user privileges on the Switch.
B)The server will not accept the username and password and the user is denied access to the Switch.
C)The server doesn’t respond to the verification query. At this point, the Switch receives the timeout from the server and then moves to the next method of verification configured in the method list.
The switch has four
The administrator for the Switch may set up 6 different authentication techniques per
Please note that user granted access to the Switch will be granted normal user privileges on the Switch. To gain access to admin level privileges, the user must enter the enable admin command and then enter a password, which was previously configured by the administrator of the Switch.
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