You will use the uplink port method for the VCP ports on the ex2300 series on the bottom of page 47 and following:
Setting an Uplink Port on an EX Series Switch as a Virtual Chassis Port
You will use the uplink port method for the VCP ports on the ex2300 series on the bottom of page 47 and following:
Setting an Uplink Port on an EX Series Switch as a Virtual Chassis Port