Specify TACACS+ Servers

Use the following procedure to specify one or more TACACS+ servers (daemons).

Access the tacacs-serversconfiguration element.

ORACLE# configure terminal
ORACLE(configure)# security
ORACLE(security)# authentication
ORACLE(authentication)# tacacs-servers
ORACLE(tacacs-servers)#

Use the address attribute to specify the IP address of this TACACS+ daemon.
```
ORACLE(tacacs-servers)# address 172.30.0.6
ORACLE(tacacs-servers)#
```
Use the port attribute to identify the daemon port that receives TACACS+ client requests.
Provide a port number within the range 1025 through 65535, or retain the default value, 49, the well-known TACACS+ port.
```
ORACLE(tacacs-servers)# port 49
ORACLE(tacacs-servers)#
```
Use the state attribute to specify the availability of this TACACS+ daemon.
Select enabled (the default) or disabled.

Only TACACS+ daemons that are in the enabled state are considered when running the server-selection algorithm.
```
ORACLE(tacacs-servers)# state enabled
ORACLE(tacacs-servers)#
```
Use the realm-id attribute to identify the realm that provides access to this TACACS+ deamon.
```
ORACLE(tacacs-servers)# realm-id accounting
ORACLE(tacacs-servers)#
```
Retain the default value for the authentication-methods attribute to specify support for all TACACS+ authentication methods (pap, chap, and ascii).
- ascii — simple login, the Oracle® Enterprise Session Border Controller (OCSBC) prompts user for username and password
- pap — similar to ascii method, but username and password are encapsulated in a PAP header
- chap — authentication based on a shared-secret, which is not passed during the authentication process
```
ORACLE(tacacs-servers)# authentication-methods all
ORACLE(tacacs-servers)#
```
Use the secret attribute to provide the shared-secret used by the TACACS+ client and the daemon to encrypt and decrypt TACACS+ messages. The identical shared-secret must be configured on associated TACACS+ clients and daemons.
Enter a 16-digit string, and ensure that the identical value is configured on the TACACS+ daemon.
```
ORACLE(tacacs-servers)# secret 1982100754609236
ORACLE(tacacs-servers)#
```
Use the dead-time attribute to specify, in seconds, the quarantine period imposed upon TACACS+ daemons that become unreachable. Quarrantined servers are not eligible to participate in the server-selection algorithm.
Supported values are integers within the range 10 through 10000 seconds, with a default value of 10 .
```
ORACLE(tacacs-servers)# dead-interval 120
ORACLE(tacacs-servers)#
```
Type done to save your configuration.
Repeat Steps 1 through 10 to configure additional TACACS+ daemons.

Note:
After configuring TACACS+ daemons, complete TACACS+ configuration by compiling a list of available deamons.

From superuser mode, use the following command sequence to access authentication configuration mode.

ORACLE# configure terminal
ORACLE(configure)# security
ORACLE(security)# authentication
ORACLE(authentication)#

Use the management-servers attribute to identify one or more TACACS+ servers available to provide AAA services.
Servers are identified by IP address, participate in the configured management-strategy, and must have been previously configured as described above.

The following example identifies three available TACACS+ servers. The list is delimited by left and right parentheses, and list items are separated by space characters.
```
ORACLE(authentication)# management-servers (172.30.0.6 172.30.1.8 172.30.2.10)
ORACLE(authentication)#
```
The following example deletes the current list.
```
ORACLE(authentication)# management-servers ()
ORACLE(authentication)#
```