Cisco Systems 78-11741-02 manual IOS SLB Network Configuration Example, IPC-152

Configuring Server Load Balancing

Configuration Examples

IOS SLB Network Configuration Example

This section provides a configuration example based on the network layout shown in Figure 24.

Figure 24 IOS SLB Network Configuration

			Restricted	Restricted
Web server	Web server	Web server	web server	web server
10.1.1.1	10.1.1.2	10.1.1.3	10.1.1.20	10.1.1.21

10.1.1.x

Virtual server 10.0.0.1

10.4.4.x

Client

29163

Human

Resources

Client Client

As shown in the following sample code, the example topology has three public Web servers and two restricted Web servers for privileged clients in subnet 10.4.4.x. The public Web servers are weighted according to their capacity, with server 10.1.1.2 having the lowest capacity and having a connection limit imposed on it. The restricted Web servers are configured as members of the same sticky group, so that HTTP connections and Secure Socket Layer (SSL) connections from the same client use the same real server.

This configuration is coded as follows:

ip slb	serverfarm PUBLIC	Unrestricted Web server farm
predictor leastconns		Use weighted least connections algorithm
real	10.1.1.1	First real server
weight 16
inservice
real	10.1.1.2	Second real server
weight 4
maxconns 1000		Restrict maximum number of connections
inservice
real	10.1.1.3	Third real server
weight 24
inservice
ip slb	serverfarm RESTRICTED	Restricted Web server farm
predictor leastconns		Use weighted least connections algorithm
real	10.1.1.20	First real server
in-service
real	10.1.1.21	Second real server
in-service

Cisco IOS IP Configuration Guide

IPC-152