Specifications

Chapter 6
6-14
Each BIG-IP in an active-active configuration requires a unit number: either
a 1 or a 2. Use the Setup utility to specify a unit number for each BIG-IP. If
you do not specify a unit number, the unit number for the virtual server
defaults to 1.
Note
You must specify the unit number when defining virtual servers, NATs, and
SNATs. You cannot add the unit number at a later time without redefining
the virtual server, NAT, or SNAT.
Note
The default SNAT is not compatible with an active-active system. However,
you may create the equivalent of a default SNAT using SNAT automap.
Refer to Enabling or disabling SNAT automap, on page 3-19.
To define virtual servers, NATs, and SNATs on
active-active units using the Configuration utility
The following example illustrates the unit ID number in a virtual server
definition. Although the steps to create a NAT or SNAT are slightly
different, the unit ID number serves the same purpose.
1. In the navigation pane, click Virtual Servers.
The Virtual Servers screen opens.
2. Click the Add button.
3. When you reach the Configure Redundant Properties screen, select
the unit number for the virtual server from the Unit ID list. The
connections served by this virtual server are managed by the BIG-IP
assigned to this unit ID.
4. Complete the Resources section of the screen. For more information
about individual settings, refer to the online help.
5. Click the Apply button.
Task 6: Updating the fail-over mechanism with the configuration changes made in BIG/db
If you change a BIG/db key that affects the fail-over mechanism (keys that
contain the word Failover) the system needs to be updated with the change.
To update the fail-over mechanism, type the following command:
b failover init
Task 7: Synchronizing the configuration
After you complete all six previous tasks on each BIG-IP in the
active-active system, synchronize the configurations on the units with the
Configuration utility, or from the command line.