To enforce a commit synchronize on the Routing Engines, log in to the Routing Engine from which you want to synchronize and issue the commit synchronize command with the force option:
[edit]user@host# commit synchronize force
re0:re1:commit complete
re0:commit complete
[edit]user@host#
For the commit synchronization process, the master Routing Engine commits the configuration and sends a copy of the configuration to the backup Routing Engine. Then the backup Routing Engine loads and commits the configuration. So, the commit synchronization between the master and backup Routing Engines takes place one Routing Engine at a time. If the configuration has a large text size or many apply-groups, commit times can be longer than desired.