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OmniSwitch Troubleshooting Guide September 2005 page 17-1
17 Troubleshooting Server
Load Balancing
In order to successfully troubleshoot the Alcatel Server Load Balancing feature, a brief understanding of
this services functions are necessary.
Our Basic Definition
The “Server Load Balancing” (SLB) term used in this document refers to the functionality of distributing
client requests across servers logically grouped in “clusters.”
A “cluster” logically aggregates a set of servers that run identical applications with access to the same
content (e.g. a Web server).
Points to Remember
• Each cluster’s Virtual IP address (VIP) is seen by clients
• 15 clusters are supported per switch
• Each cluster can have up to 5 servers
Note. The Alcatel OmniSwitch 7700/7800/8800 supports two different types of SLB distribution algo-
rithms. Reading “Configuring Server Load Balancing” in the OmniSwitch 7700/7800/8800 Network
Configuration Guide for a more detailed explanation of these algorithms is highly recommended.
In This Chapter
“Introduction” on page 17-2
“Server Load Balance Failure” on page 17-2
“What is an SLB Failure?” on page 17-2
“Description of a Complete Failure of Service” on page 17-2
“Description of a Complete Failure of Service” on page 17-2
“Troubleshooting Commands” on page 17-3
“Troubleshooting a Complete Failure” on page 17-4
“Troubleshooting a Partial Failure” on page 17-5
“The Troubleshooting Procedure” on page 17-5