Alcatel Carrier Internetworking Solutions 6800 User Manual
Introduction
Troubleshooting Server Load Balancing
page 17-2
OmniSwitch Troubleshooting Guide
September 2005
Introduction
The primary function of a Server Load Balance cluster is to provide a method to logically treat a group of
physical servers (known as a server farm) as one large virtual server (known as an SLB cluster).
physical servers (known as a server farm) as one large virtual server (known as an SLB cluster).
Note. This document does not discuss the basic operation of Server Load Balancing. To learn about how
SLB works, refer to “Configuring Server Load Balancing” in the OmniSwitch 7700/7800/8800 Network
Configuration Guide.
SLB works, refer to “Configuring Server Load Balancing” in the OmniSwitch 7700/7800/8800 Network
Configuration Guide.
This document assumes the reader has knowledge of the Server Load Balance operation.
In the following pages we will discuss:
• How to determine a Server Load Balance failure
• Troubleshooting a Server Load Balance Failure
Server Load Balance Failure
What is an SLB Failure?
A failure in the Alcatel Server Load Balance feature will appear in 1 of 2 forms. We will discuss these two
forms in the following paragraphs:
forms in the following paragraphs:
• Complete failure of service
• Partial failure of service
Description of a Complete Failure of Service
A complete failure of service is best described as a loss of connectivity to all servers for all users. This can
be verified by a simple connectivity test (ping) to the SLB cluster Virtual IP (SLB VIP).
be verified by a simple connectivity test (ping) to the SLB cluster Virtual IP (SLB VIP).
Description of a Partial Failure of Service
A partial failure of service is best described as a condition where the traffic distribution rules are not being
adhered to, but cluster connectivity is still present.
adhered to, but cluster connectivity is still present.