Last Modified: Jul 22, 2021
Opened: Oct 25, 2019
For BIG-IQ with DCD clusters are configured with auto-failover and the active, secondary, and DCD clusters have a network configuration similar to: Mgmt: 10.145.x.x Self IP: 10.3.x.x (subnet to talk to BIG IPs) Discovery address: 10.5.x.x (could be a Gateway address) The self IP is the subnet BIG-IQ uses to communicate with managed BIG-IP devices, so you must discover a DCD using the self IP. (Discovery/Listeners address) This IP address is displayed from BIG-IQ and not well-formed because they are in a different subnet (10.3.x.x virtual server 10.5.x.x).
Unable to form auto failover high availability (HA) as the addresses are not in the same subnet/ because of the "is DCD attached to primary" validation.
When the BIG-IQ Quorum for an auto-failover configuration's discovery address is different than the IP address used for the Discovery/listener's address when adding a DCD to BIG-IQ.
Create an additional DCD that is in an isolated zone to ensure that it will not be assigned to a BIG-IP not in that zone. Do not use an API to work around this, as BIG-IQ will return an error because there is a backend validation that compares the DCD cluster you added to the IP addresses of the Quorum.