I forgot to mention you can easily force a synchronization.
To see the status, use the following command
show database synchronize
To force a synchronization (of both L2 and L3 MMs) use the following command from the MM that is the VRRP master
database-synchronize
The following output shows the synchronization status, then performs a synchronization, and then shows the status again.
(MM2) [mynode] #show database synchronize
Last L2 synchronization time: Fri May 31 18:04:28 2019
Last L3 synchronization time: Fri May 31 17:04:23 2019
To Master Switch at 10.254.1.101: succeeded
To Secondary Master Switch at 192.168.240.100: succeeded
WMS Database backup file size: 45968 bytes
Upgrademgr Database backup file size: 3392 bytes
Cluster upgrademgr Database backup file size: 3885 bytes
Local User Database backup file size: 35910 bytes
Global AP Database backup file size: 24270 bytes
IAP Database backup file size: 3769 bytes
Airgroup Database backup file size: 3069 bytes
License Database backup file size: 5599 bytes
CPSec Database backup file size: 3224 bytes
Bocmgr Database backup file size: 6047 bytes
L2 Synchronization took 4 second
L3 Synchronization took less than one second
200 L2 synchronization attempted
0 L2 synchronization have failed
101 L3 synchronization attempted
2 L3 synchronization have failed
L2 Periodic synchronization is enabled and runs every 60 minutes
L3 Periodic synchronization is enabled and runs every 120 minutes
Synchronization doesn't include Captive Portal Custom data
Airmatch database gets synchronized periodically. Last synchronization time : 2019-05-31 17:49:35
(MM2) [mynode] #database-synchronize
Database synchronize has been initiated.
Please check the status using 'show database synchronize' command.
(MM2) [mynode] #show database synchronize
Last L2 manual synchronization time: Fri May 31 18:09:36 2019
Last L3 manual synchronization time: Fri May 31 18:09:37 2019
To Master Switch at 10.254.1.101: succeeded
To Secondary Master Switch at 192.168.240.100: succeeded
WMS Database backup file size: 46124 bytes
Upgrademgr Database backup file size: 3392 bytes
Cluster upgrademgr Database backup file size: 3885 bytes
Local User Database backup file size: 35910 bytes
Global AP Database backup file size: 24270 bytes
IAP Database backup file size: 3769 bytes
Airgroup Database backup file size: 3069 bytes
License Database backup file size: 3248 bytes
CPSec Database backup file size: 3224 bytes
Bocmgr Database backup file size: 6047 bytes
L2 Synchronization took 3 second
L3 Synchronization took 1 second
201 L2 synchronization attempted
0 L2 synchronization have failed
102 L3 synchronization attempted
2 L3 synchronization have failed
L2 Periodic synchronization is enabled and runs every 60 minutes
L3 Periodic synchronization is enabled and runs every 120 minutes
Synchronization doesn't include Captive Portal Custom data
Airmatch database gets synchronized periodically. Last synchronization time : 2019-05-31 17:49:35