In order for F5 load balancing to be configured properly, the Virtual IP address
(VIP) of the LTM server must be set as the loopback interface on
DNS/DHCP Servers in the F5 pool.
If there's more than one VIP associated with an LTM
server, all of those IP addresses must be set as loopback addresses on the DNS/DHCP Servers in the F5 pool.
The VIP of the LTM server must be obtained when configuring
the LTM server on the F5 management interface. For more
information, refer to https://f5.com/products/big-ip/local-traffic-manager-ltm.
To configure loopback addresses:
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From the configuration drop-down menu, select a configuration.
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Select the Servers tab. Tabs remember the page you
last worked on, so select the tab again to ensure you're on the
Configuration information page.
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Click the server or xHA pair name menu button and select
Service Configuration.
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From the Service Type drop-down menu, select
Interfaces. Address Manager queries the server and
returns the current interface configurations.
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Under the Interface column, choose the loopback
(lo) interface then navigate across the row to the
Action column and click Edit.
The Edit Interface pop-up window opens.
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Complete the following:
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Click OK.
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Under Addresses, expand to view the newly added
loopback address.