Cabletron Systems 9032578-05 manual Verifying Servers and Applications

Chapter 17: Web Hosting Configuration Guide

Verifying Servers and Applications

The SSR automatically performs the following types of verification for the attached load balancing servers/applications:

•Verifies the state of the server by sending a ping to the server at 5-second intervals. If the SSR does not receive a reply from a server after four ping requests, the server is considered to be “down.”

•Checks that an application session on the server can be established by doing a simple TCP handshake with the application on the configured physical port of the server at 15-second intervals. If the SSR does not receive a reply from the application after four tries, the application is considered to be “down.”

You can change the intervals at which pings or handshakes are attempted and the number of times that the SSR retries the ping or handshake before considering the server or application to be “down.” You can change these parameters for all servers in a load balancing group or for specific servers.

You can change the ping intervals and the number of retries by entering the following Configure mode commands:.

Set ping interval for all servers in	load-balance set group-options <group
specified group.	name> ping-int<seconds>
Set ping interval for specific	load-balance set server-options <ipaddr>
server.	ping-int<seconds> port <port number>
Set number of ping retries for all	load-balance set group-options <group
servers in specified group.	name> ping-tries<number>
Set number of ping retries for	load-balance set server-options <ipaddr>
specific server.	ping-tries<number> port <port number>

You can change the handshake intervals and the number of retries by entering the following Configure mode commands:

Set handshake interval for all	load-balance set group-options <group
servers in specified group.	name> app-int<seconds>
Set handshake interval for	load-balance set server-options <group
specified server.	name> app-int<seconds> port <port
	number>
Set number of handshake retries	load-balance set group-options <group
for all servers in specified group.	name> app-tries<number>
Set number of verification retries	load-balance set server-options <group
for specified server.	name> app-tries<number> port <port
	number>

236 SmartSwitch Router User Reference Manual