Brocade Communications Systems 6650 Specifying different servers for individual AAA functions

TACACS and TACACS+ security

The auth-portparameter specifies the UDP (for TACACS) or TCP (for TACACS+) port number of the authentication port on the server. The default port number is 49.

Specifying different servers for individual AAA functions

In a TACACS+ configuration, you can designate a server to handle a specific AAA task. For example, you can designate one TACACS+ server to handle authorization and another TACACS+ server to handle accounting. You can set the TACACS+ key for each server.

To specify different TACACS+ servers for authentication, authorization, and accounting, enter the command such as following.

Brocade(config)# tacacs-server host 10.2.3.4 auth-port 49 authentication-only key abc

Brocade(config)# tacacs-server host 10.2.3.5 auth-port 49 authorization-only key def

Brocade(config)# tacacs-server host 10.2.3.6 auth-port 49 accounting-only key ghi

Syntax: tacacs-server host ip-addripv6-addrauthorization-only accounting-only

server-name[auth-port num] [authentication-only default] [key 0 1 string]

The default parameter causes the server to be used for all AAA functions.

After authentication takes place, the server that performed the authentication is used for authorization and accounting. If the authenticating server cannot perform the requested function, then the next server in the configured list of servers is tried; this process repeats until a server that can perform the requested function is found, or every server in the configured list has been tried.

Setting optional TACACS and TACACS+ parameters

You can set the following optional parameters in a TACACS and TACACS+ configuration:

•TACACS+ key – This parameter specifies the value that the Brocade device sends to the TACACS+ server when trying to authenticate user access.

•Retransmit interval – This parameter specifies how many times the Brocade device will resend an authentication request when the TACACS/TACACS+ server does not respond. The retransmit value can be from 1 – 5 times. The default is 3 times.

•Dead time – This parameter specifies how long the Brocade device waits for the primary authentication server to reply before deciding the server is dead and trying to authenticate using the next server. The dead-time value can be from 1 – 5 seconds. The default is 3 seconds.

•Timeout – This parameter specifies how many seconds the Brocade device waits for a response from a TACACS/TACACS+ server before either retrying the authentication request, or determining that the TACACS/TACACS+ servers are unavailable and moving on to the next authentication method in the authentication-method list. The timeout can be from 1 – 15 seconds. The default is 3 seconds.

32	Brocade ICX 6650 Security Configuration Guide
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