Manual Chapter : BIG-IQ in an auto failover HA configuration with a floating IP address

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BIG-IQ Centralized Management

  • 7.0.0
Manual Chapter

BIG-IQ in an auto failover HA configuration with a floating IP address

A BIG-IQ HA configuration with automatic fail over consists of three components.
BIG-IQ HA Configuration with Auto Fail Over
Active BIG-IQ
The BIG-IQ currently managing all BIG-IP devices.
Standby BIG-IQ
The standby BIG-IQ that has the same configuration as the active BIG-IQ. The standby BIG-IQ automatically becomes active if the active BIG-IQ fails over.
Quorum DCD
A quorum data collection device (DCD) makes the deciding vote for which BIG-IQ will become active if communication is disrupted between the components of the BIG-IQ high availability configuration. If the quorum DCD is able to communicate with one of the BIG-IQ in the pair during the disruption, that BIG-IQ becomes active. The quorum DCD is not a peer BIG-IQ in an HA configuration.
A healthy BIG-IQ auto failover high availability configuration with a floating IP address looks like this.
The three members of the high availability configuration form a voting cluster and continuously monitor each others health. If the standby and quorum DCD agree that the active BIG-IQ is no longer able to perform its function, failover is triggered. The standby BIG-IQ is promoted to an active standalone BIG-IQ using the floating IP address, fencing off the formerly active BIG-IQ. After you resolve the issue that caused the failover, you can reestablish the BIG-IQ auto failover HA configuration.
The floating IP address must be on the same network (this configuration uses Gratuitous ARP packets) as the active and standby BIG-IQ systems’ local management address (interface eth0) and not any of the discovery self IP addresses. This does not restrict HA traffic; HA traffic can be on any of the available interfaces.
Floating IP addresses are not supported if your active and standby BIG-IQ systems are in a public cloud environment, such as AWS, Azure, or VMware.