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Configuring Server Load Balancing
Configuration Examples
IPC-152
Cisco IOS IP Configuration Guide
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
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
Web server
10.1.1.1
10.4.4.x
10.1.1.x
Client Client
Client
Human
Resources
Virtual server
10.0.0.1
Web server
10.1.1.2
Web server
10.1.1.3
Restricted
web server
10.1.1.21
Restricted
web server
10.1.1.20
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