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Product Manuals and Release notes
You can ensure that you always have access to managed BIG-IP devices by installing two or more BIG-IQ systems in an active-active, high availability (HA) cluster. Any configuration change that occurs on one BIG-IQ system is immediately synchronized with its peer devices. If a BIG-IQ system in an active-active HA cluster fails, a peer BIG-IQ system takes over the device management that was previously done by the original device.
Configuring BIG-IQ Cloud in a high availability cluster means you always have management access to the BIG-IP devices in your network. (Configuring a high availability cluster is optional.)
If discovery fails, a Delete button displays. Verify the correct self IP address and credentials. Then click the Delete button to remove the incorrect information, and re-type the self IP address, user name, and password.