Kemp High Availability, Feature Description And Operation Manual

Page: 26 / 37

Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 26 / 37
High Availability (HA)
Feature Description
9 Troubleshooting
This section outlines troubleshooting steps for some common HA-related problems. If further help is
needed, please contact KEMP Support.
9.1 General Troubleshooting Tips
General HA troubleshooting steps are below:

Check that the IP settings for the Interface , Partner and Shared IP address are correct.
These settings can be found in System Configuration > Interfaces > eth0 .

Log in to each of the single HA interface addresses and ensure the HA parameters are
correct (
Local Administration > HA Parameters ):

Ensure that unit 1 is set to HA (First) Mode and unit 2 is HA (Second) Mode

Ensure that both units are on the same protocol and HA ID

Ensure that all of the IP addresses are available and are not in use by another device. IP
conflict will cause numerous problems.

Shut down one or both LoadMasters and try to ping the IP address of each unit. If there
is an answer, another device is using that IP address. Try arp-a or netstat to find out
more information on what device that is.

Set the HA Virtual ID (in Local Administration > HA Parameters ) to something other
than 1 . The further up the range the better – avoid numbers from 1 to 10 as other HA
devices may have those IDs and use Virtual Router Redundancy Protocol (VRRP).

Check that the time of both units are in sync.
9.2 No HA Status Squares are Visible in the WUI
If the HA status squares, for example , are not appearing in the WUI, it probably
means that HA is not enabled. Go to System Administration > Miscellaneous Options > HA
Parameters and ensure the HA Mode is set to either First or Second .
9.3 Green/Red HA Status Squares
If one of the HA status squares is red, check if one of the machines has crashed. If it has not
crashed, try the following steps:

Confirm that multicast is allowed on the network

Confirm that IGMP snooping is disabled

Ensure that promiscuous mode and portfast is enabled

For VLMs; ensure that MAC spoofing is allowed

Reboot both of the units via a single IP

Ping between the units

Confirm the network settings

Check the HA settings on both machines