Cisco Cisco IOS Software Release 12.2(27)SBC

To enable RADIUS server load balancing for a named RADIUS server group, use the load-balance 
command in server group configuration mode. To disable named RADIUS server load balancing, use the 
no form of this command.

load-balance method least-outstanding [batch-size number] [ignore-preferred-server]

If this command is not configured, named RADIUS server load balancing will not occur.

Server group configuration

The following example shows load balancing enabled for a named RADIUS server group. It is shown in 
three parts: the current configuration of RADIUS command output, debug output, and AAA server status 
information. 

The following shows the relevant RADIUS configuration: 

Router# show running-config

.

Enables least outstanding mode for load balancing.

(Optional) The number of transactions to be assigned per batch. 

(Optional) The number of transactions in a batch.

The default is 25.

The range is 1–2147483647.

Batch size may impact throughput and CPU load. It is 
recommended that the default batch size, 25, be used because it 
is optimal for high throughput, without adversely impacting 
CPU load.

(Optional) Indicates if a transaction associated with a single 
authentication, authorization, and accounting (AAA) session should 
attempt to use the same server or not. 

If set, preferred server setting will not be used.

Default is to use the preferred server.

12.2(28)SB

This command was introduced.

12.4(11)T

This command was integrated into Cisco IOS Release 12.4(11)T.