Present article is to advise client on how to synchronize configuration on Dual Routing Engine Chassis, specially when there was a hardware R.E. change

Need to transfer updated configuration lines to a backup Routing Engine, which might have stable or default config. lines after hardware swap

To push configuration lines from Main R.E. to backup R.E. use following command over configure mode: #commit synchronize

Tips:

1) To do this command its not mandatory for the 2 Routing Engines to be on same JunOS release. They can differ JunOS and action will be successful. If it fails then open a Service Request to have feedback for the error.

2) After command, you can compare lines from both Routing Engine via doing this command from both R.E. #show | display set | count

Warning: Do not run command from Routing Engine which is backup/ or doesn't have update config. lines, as it will erase updated configuration to a default configuration.