Cisco Cisco IOS Software Release 12.2(27)SBC

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RADIUS Server Load Balancing
  radius-server host
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Cisco IOS Security Configuration Guide
radius-server host
To specify a RADIUS server host, use the radius-server host command in global configuration mode. 
To delete the specified RADIUS host, use the no form of this command.
radius-server host {hostname ip-address} [test username user-name] [auth-port port-number
[ignore-auth-port] [acct-port port-number] [ignore-acct-port] [timeout seconds
[retransmit retries] [key string] [alias {hostname ip-address}] [idle-time seconds]
no radius-server host {hostname | ip-address}
Syntax Description
hostname
Domain Name System (DNS) name of the RADIUS server host.
ip-address
IP address of the RADIUS server host.
test username
(Optional) Turns on the automated testing feature for RADIUS server load 
balancing.
user-name
(Optional) Test user ID username.
Must be used if the test username keyword is used.
Caution
It is recommended that a test user, one that is not defined on the 
RADIUS server, be used for RADIUS server automated testing to 
protect against security issues that may arise if the test user is not 
correctly configured.
auth-port 
(Optional) Specifies the UDP destination port for authentication requests.
port-number
(Optional) Port number for authentication requests; the host is not used for 
authentication if set to 0. If unspecified, the port number defaults to 1645.
ignore-auth-port
(Optional) Turns off the automated testing feature for RADIUS server load 
balancing on the authentication port.
acct-port 
(Optional) Specifies the UDP destination port for accounting requests.
port-number
(Optional) Port number for accounting requests; the host is not used for 
accounting if set to 0. If unspecified, the port number defaults to 1646.
ignore-acct-port
(Optional) Turns off the automated testing feature for RADIUS server load 
balancing on the accounting port.
timeout 
(Optional) The time interval (in seconds) that the router waits for the RADIUS 
server to reply before retransmitting. This setting overrides the global value of 
the radius-server timeout command. If no timeout value is specified, the global 
value is used. Enter a value in the range 1 to 1000. 
seconds
(Optional) Specifies the timeout value. Enter a value in the range 1 to 1000. If 
no timeout value is specified, the global value is used.
retransmit 
(Optional) The number of times a RADIUS request is re-sent to a server, if that 
server is not responding or responding slowly. This setting overrides the global 
setting of the radius-server retransmit command. 
retries
(Optional) Specifies the retransmit value. Enter a value in the range 1 to 100. If 
no retransmit value is specified, the global value is used.