Alcatel Carrier Internetworking Solutions 6800 User Manual

Troubleshooting Server Load Balancing

Troubleshooting a Partial Failure

OmniSwitch Troubleshooting Guide

page 17-5

The number one cause of a partial failure is misconfiguration. In the following area, we will show you 
how to determine the SLB configuration.

If you have reason to believe that the SLB cluster is operational, however inaccessible, Alcatel’s 7700/
7800/8800 provides useful commands for narrowing down the problem.

One of the most useful commands used in troubleshooting SLB problems on the 7700/7800/8800 product 
line is the show ip slb clusters command. 

For example:

-> show ip slb clusters

Admin

Operational

#

%

Cluster Name

VIP

Status

Status

Srv

Avail

----------------+----------------+--------+-------------------+-----+---------
WorldWideWeb

128.241.130.204 Enabled

In Service

3

95

Intranet

128.241.130.205 Enabled

In Service

2

100

FileTransfer

128.241.130.206 Enabled

Out of Service

2

50

As shown in the example above, this command will provide pertinent information in verifying which 
server cluster(s) are inaccessible or malfunctioning. 

After you have determined which SLB cluster is not accessible, performing the show ip slb cluster 
cluster-name command will provide more detailed information on the configuration and status of the 
above named SLB cluster.

The show active policy rule and show policy condition commands are also useful when troubleshooting 
SLB problems:

-> show active policy rule
             Policy               From  Prec Enab   Act Refl Log Save   Matches
 SLB-rule-FTP                      api 65000  Yes   Yes   No  No  Yes         7
  (  L3):                     SLB-cond-FTP -> SLB-act-FTP                     

-> show policy condition 
 Condition Name                   From          Src -> Dest
 SLB-cond-FTP                      api
 *IP     :                                      Any -> 172.160.1.100