If you have a Ex4200 unit in hand that was pulled out from a virtual chassis stack, configured as linecard (LC), you may want to convert it back to “routing-engine” (RE) for future usage.
I would suggest first to reset the unit to factory default (in CLI mode) :
load factory-default set system root-authentication plain-text-password
Apply the change :
commit
Then convert it back to routing-engine with the following command :
set virtual-chassis no-split-detection
Apply the change :
commit synchronize
Your EX switch is now ready to be used as standalone or virtual chassis RE.