Replace managed device

When you replace a standalone FortiGate device, the usual and recommended method in FortiManager is to use execute device replace sn.

When you replace a FortiGate cluster member, you don’t need to use execute device replace sn because the cluster updates FortiManager about the new cluster member.

If the new cluster member appears in FortiManager as unregistered, delete it from the unregistered device list so that FortiManager can discover the new device as a cluster member.

If the FortiAnalyzer feature set is used and you need to replace a standalone FortiGate device or a cluster member, the best practice is to add the new device as a new member so as to preserve existing logs. Consider adding the old and new FortiGate devices into a group for reporting purposes.