I have a requirement to have 3 ASA or Firepower devices in my environment with their configurations sync'd. Is there any way to have 2 passive devices with 1 active? Any other recommendations to solve this issue?
No, that's not possible with the ASA. It's always 1*active and 1*standby. Perhaps you could achieve something similar with an additional standby device that gets manually synced with a script.
A cluster could be built with three (and even more) devices. But these devices are all active and the clusters with more than two devices are only possible with the high-end platforms.
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