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Configuring a Redundant System
BIG-IP® Reference Guide 6-9
Using network-based fail-over
Network-based fail-over allows you to configure your redundant BIG-IP to
use the network to determine the status of the active unit. Network-based
fail-over can be used in addition to, or instead of, hard-wired fail-over.
To configure network-based fail-over using the
Configuration utility
1. In the navigation pane, click System.
The Network Map screen opens.
2. Click the Redundant Properties tab.
The Redundant Properties screen opens.
3. Check the Network Failover Enabled box.
4. Click the Apply button.
To configure network-based fail-over in BIG/db
To enable network-based fail-over, you need to change the settings of
specific BIG/db database keys using the bigpipe db command. To enable
network-based fail-over, the Common.Sys.Failover.Network key must be
set to one (1). To set this value to one, type:
b db set Common.Sys.Failover.Network=1
b failover init
Other keys are available to lengthen the delay to detect the fail-over
condition on the standby unit, and to lengthen the heart beat interval from
the active unit. The default number of seconds required for the standby unit
to notice a failure in the active unit is 3 seconds. To change the default
setting, use the following syntax:
b db set Common.Bigip.Cluster.StandbyTimeoutSec=<value>
b failover init
The default heart beat interval is 1 second. To change it from the active
BIG-IP, change the following value using b db:
b db set Common.Bigip.Cluster.ActiveKeepAliveSec=<value>
b failover init
Setting a specific BIG-IP to be the preferred active unit
Setting a preferred active unit means overlaying the basic behavior of a
BIG-IP with a preference toward being active. A BIG-IP that is set as the
active unit becomes active whenever the two units negotiate for active
status.
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