Cabletron Systems SmartSwitch manual Configuring Load Balancing, Creating the Server Group

Chapter 15: Web Hosting Configuration Guide

Load Balancing

Note: Some commands in this facility require updated SSR hardware. Please refer to the Release Notes for details.

You can use the load balancing feature on the SSR to distribute session load across a group of servers. If you configure the SSR to provide load balancing, client requests that go through the SSR can be redirected to any one of several predefined hosts. With load balancing, clients access servers through a virtual IP. The SSR transparently redirects the requests with no change required on the clients or servers; all configuration and redirection is done on the SSR.

Configuring Load Balancing

The following are the steps in configuring load balancing on the SSR:

1.Create a logical group of load balancing servers and define a virtual IP for the group.

2.Specify the policy for distributing workload for this group of load balancing servers. This step is optional; by default, the SSR assigns sessions to servers in a round-robin (sequential) manner.

3.Define the servers in the group.

Creating the Server Group

To use load balancing, you create a logical group of load balancing servers and define a virtual IP for the server that the clients will use to access the server pool.

To create the server group and define the virtual IP for the server, enter the following command in Configure mode:.

Create group of load balancing	load-balance create group-name <group
servers.	name> virtual-ip <ipaddr> virtual-port
	<port number> protocol tcpudp
Create a range of load balancing	load-balance create vip-range-name <range
server groups.	name> vip-range <range> virtual-port
	<port number> protocol tcpudp

Specifying Load Balancing Policy (Optional)

The default policy for distributing workload among the load balancing servers is “round- robin,” where the SSR selects the server on a rotating basis without regard to the load on individual servers. Other policies can be chosen for the group, including least loaded, where the server with the fewest number of sessions bound to it is selected to service a

234 SmartSwitch Router User Reference Manual