Juniper EX2300-48MP comes with total of six uplink ports. I had to convert two of these ports into virtual chassis ports. I used 2 x 10 Gig SFP+ and multi-mode cables to form a VC.
Converting Ports into VC Ports:
These simple commands allowed me to convert the last two ports into Virtual Chassis Ports.
request virtual-chassis vc-port set pic-slot 1 port 4 local
request virtual-chassis vc-port set pic-slot 1 port 5 localFirst part of the switc is pic-slot 0 and the next one is pic-slot 1.