Balancing Transaction Load On The Radius Server; Configuring Load Balancing For Global Radius Server Group - Cisco ASR 9000 Series Configuration Manual

Balancing Transaction Load on the RADIUS Server

Setting IP DSCP for RADIUS Server: An example
configure
radius-server ipv4 dscp 43
radius-server ipv4 dscp default
!
end
Balancing Transaction Load on the RADIUS Server
The RADIUS load-balancing feature is a mechanism to share the load of RADIUS access and accounting
transactions, across a set of RADIUS servers. Each AAA request processing is considered to be a transaction.
BNG distributes batches of transactions to servers within a server group.
When the first transaction for a new is received, BNG determines the server with the lowest number of
outstanding transactions in its queue. This server is assigned that batch of transactions. BNG keeps repeating
this determination process to ensure that the server with the least-outstanding transactions always gets a new
batch. This method is known as the least-outstanding method of load balancing.
You can configure the load balancing feature either globally, or for RADIUS servers that are part of a server
group. In the server group, if a preferred server is defined, you need to include the keyword
"ignore-preferred-server" in the load-balancing configuration, to disable the preference.
For configuring the load balancing feature globally, see
Server Group, on page
For configuring the load balancing feature on RADIUS servers that are part of a named server group, see
Configuring Load Balancing for a Named RADIUS Server Group, on page

Configuring Load Balancing for Global RADIUS Server Group

Perform this task to activate the load balancing function for the global RADIUS server group. As an example,
in this configuration the preferred server is set to be ignored.
SUMMARY STEPS
1. configure
2. radius-server load-balance method least-outstanding batch-size size
3. radius-server load-balance method least-outstanding ignore-preferred-server batch-size size
4. Use the commit or end command.
DETAILED STEPS
Command or Action
Step 1
configure
Example:
RP/0/RSP0/CPU0:router# configure
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Configuration Guide,
Release 4.3.x
50
Configuring Authentication, Authorization, and Accounting Functions
50.
Purpose
Enters global configuration mode.
Configuring Load Balancing for Global RADIUS
51.
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