A recently replaced EX4300 switch is in a boot loop, not entering satellite mode.

EX4300 in boot loop, not entering satellite mode

An EX4300 switch which is factory reset, as it should come in a RMA, should convert to satellite mode automatically if connected to an aggregation device which is properly configured.

This knob does not come from the factory, and needs to be applied if the EX4300 is not converting automatically:

# set chassis auto-satellite-conversion