History for High Availability
| Feature | Minimum Firewall Management Center | Minimum Firewall Threat Defense | Details | 
|---|---|---|---|
| High availability support for the manager access data interface | 7.4 | 7.4 | You can now use a data interface for manager access with Firewall Threat Defense high availability. | 
| Unregistering a high-availability pair now allows you to re-register without breaking the pair | 7.3 | Any | When you delete (unregister) a high-availability pair, you no longer have to manually break the pair at the CLI and re-register standalone devices. You can now add the primary unit to a new Firewall Management Center, and the standby unit will be discovered automatically. Re-registering the pair will still erase the configuration, and your policies will need to be re-applied. | 
| Policy rollback support for high availability | 7.2 | Any | The configure policy rollback command is supported for high availability. | 
| Config-Sync Optimization feature for faster HA peering | 7.2 | Any | The Config-Sync Optimization feature enables comparing the configuration of the joining unit and the active unit by exchanging config-hash values. If the hash computed on both active and joining units match, the joining unit skips full config-sync and rejoin the HA. This feature enables faster HA peering and reduces maintenance window and upgrade time. | 
| Improvements to the upgrade workflow for clustered and high-availability devices | 7.1 | Any | We made the following improvements to the upgrade workflow for clustered and high-availability devices: 
 | 
| Clearing routes in a high-availability group or cluster. | 7.1 | Any | In previous releases, the clear route command cleared the routing table on the unit only. Now, when operating in a high-availability group or cluster, the command is available on the active or control unit only, and clears the routing table on all units in the group or cluster. | 
| FTD High Availability Hardening | 6.2.3 | Any | Version 6.2.3 introduces the following features for FTD devices in high availability: 
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