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Configuration Menu 94
TACACS+ server configuration
Command: /cfg/sys/tacacs+
[TACACS+ Server Menu]
prisrv - Set IP address of primary TACACS+ server
secsrv - Set IP address of secondary TACACS+ server
secret - Set secret for primary TACACS+ server
secret2 - Set secret for secondary TACACS+ server
port - Set TACACS+ port number
retries - Set number of TACACS+ server retries
timeout - Set timeout value of TACACS+ server retries
telnet - Enable/disable TACACS+ back door for telnet/ssh/http/https
secbd - Enable/disable TACACS+ secure backdoor for telnet/ssh/http/https
cmap - Enable/disable TACACS+ new privilege level mapping
usermap - Set user privilege mappings
on - Enable TACACS+ authentication
off - Disable TACACS+ authentication
cur - Display current TACACS+ settings
TACACS+ (Terminal Access Controller Access Control System) is an authentication protocol that allows a remote
access server to forward a user's logon password to an authentication server to determine whether access can be
allowed to a given system. TACACS+ and Remote Authentication Dial-In User Service (RADIUS) protocols are more
secure than the TACACS encryption protocol. TACACS+ is described in RFC 1492.
TACACS+ protocol is more reliable than RADIUS, as TACACS+ uses the Transmission Control Protocol (TCP) whereas
RADIUS uses the User Datagram Protocol (UDP). Also, RADIUS combines authentication and authorization in a user
profile, whereas TACACS+ separates the two operations.
TACACS+ offers the following advantages over RADIUS as the authentication device:
• TACACS+ is TCP-based, so it facilitates connection-oriented traffic.
• It supports full-packet encryption, as opposed to password-only in authentication requests.
• It supports decoupled authentication, authorization, and accounting.
The following table describes the TACACS+ Server Configuration Menu options.
Table 84 TACACS+ Server Configuration Menu options
Command Description
prisrv <IP address> Defines the primary TACACS+ server address. For example,
100.10.1.1
secsrv <IP address> Defines the secondary TACACS+ server address. For example,
100.10.1.2
secret <1-32 characters> This is the shared secret between the switch and the TACACS+ server(s).
secret2 <1-32 characters> This is the secondary shared secret between the switch and the TACACS+
server(s).
port <TCP port number> Enter the number of the TCP port to be configured, between 1 - 65000.
The default is 49.
retries <1-3> Sets the number of failed authentication requests before switching to a
different TACACS+ server. The range is 1-3 requests. The default is 3
requests.
timeout <4-15> Sets the amount of time, in seconds, before a TACACS+ server
authentication attempt is considered to have failed. The range is 4-15
seconds. The default is 5 seconds.
telnet enable|disable Enables or disables the TACACS+ back door for telnet. The telnet
command also applies to SSH/SCP connections and the Browser-based
Interface (BBI). This command does not apply when secure backdoor
(
secbd) is enabled.
secbd enable|disable Enables or disables the TACACS+ back door using secure password for
telnet/SSH/ HTTP/HTTPS. This command does not apply when backdoor
(telnet) is enabled.
cmap enable|disable Enables or disables TACACS+ privilege-level mapping.
The default value is disabled.