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Before interconnecting EX3300 switches in a Virtual Chassis configuration, you must consider the following factors:

The number of switches in the Virtual Chassis and their location—Starting in Junos OS Release 12.2, you can interconnect a maximum of ten EX3300 switches to form a Virtual Chassis composed exclusively of EX3300 switches. You can connect up to six EX3300 switches in an EX3300 Virtual Chassis in prior Junos OS releases.
Mounting—You can mount the switches in a single rack or install them on multiple racks. For information on the size and strength of racks, see Rack Requirements for EX3300 Switches.
Cabling requirements for Virtual Chassis—You can interconnect EX3300 switches into a Virtual Chassis through uplink ports configured as Virtual Chassis ports (VCPs). By default, ports 2 and 3 of any uplink module are configured as VCPs.
For information on uplink module port cabling requirements, see Network Cable Specifications for EX3300 Switches.
Power requirements—You must plan the installation site to meet the power requirements of the switches in a Virtual Chassis. See Power Specifications for EX3300 Switches.