I have an ASA with FirePower and also have 2 x FMC in a HA configuration (over a layer 3). My question is, how does the ASA FirePower senor know how to failover to the secondary FMC in the event the primary FMC dies? Since the initial configuration on the ASA FirePower sensor only one FMC management IP is added/allowed.
Normally, when configuring HA FMC, your sensor should get a config with the 2nd FMC that will be used when primary fails. If it's not working, then you might need to go back to your sensor, remove the registration and re-do it. There was a link I already shared I believe in this forum. Here is the link with a quick and clear explanation: https://dependencyhell.net/2017/07/10/FMC-HA.html
Thanks Francesco PS: Please don't forget to rate and select as validated answer if this answered your question
Thank you for your reply. So to clarify; FMC's are in HA already. Once the ASA FirePower sensor is added with the primary FMC's IP, it should also receive config for the secondary FMC? If so, is there anyway to verify that from the console or is failing the primary FMC the only way to verify?