Draytek Vigor2862 Series User Manual page 248

Note: The "Cached Time" indicates the time that router has got the information from
the other router ago. Click "Renew" to update the information of remote router, click
"Refresh" to update the information of local router.
When a sync is finished or the routers are already having the same configuration, it will
show the "Equal" result:
Note that the router will check if there's any un-synced modification when it reaches
the time interval we set in step 2. We may force to sync by clicking the "Sync" button.
The secondary router will reboot after the config sync.
9. Now we may inspect if the secondary router received the configuration from the primary
router. In this scenario we check the secondary router online status.
Before syncing we didn't configure the WAN, now seeing WAN1 and WAN2 having "Static
IP" indicates it did receive the corresponding configurations. And the "Disconnected-HA"
means this router is not dialing up the WAN due to the primary router in the High
Availability group is working, so as a secondary router it doesn't need to be online now.
You may also check other configurations on your secondary router.
232 Vigor2862 Series User's Guide