The default behavior of MLX/XMR linecards is tocontinue to forward traffic while the management module is reloading. Eventually, the traffic forwarding stops when the linecard reboots and resumes after the linecard comes back up.
In certain scenarios, it is not desirable to forward traffic after the reload command is issued. Therefore, a new feature was introduced starting from code release 4.1.0, to immediately shutdown all linecards in a chassis after a reload command is issue. This feature can be enabled via
bootLP boot options
disable-lp-sync-check disable LP sync check
fast-powerdownenable fast LP power-down for next reload