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Planning EX4200, EX4500, and EX4550 Virtual Chassis

 

Before interconnecting EX4200, EX4500, and EX4550 switches in a Virtual Chassis configuration:

  • Verify that the rack in which you will install the switches meets the requirements described in Rack Requirements. You can mount the switches in a Virtual Chassis on a single rack or on multiple racks.

  • Verify that the installation site meets the power requirements of the switches in a Virtual Chassis.

  • Verify that you have installed a Virtual Chassis module in an EX4500 switch running Junos OS releases earlier than Release 11.4R1. The Virtual Chassis module must be installed in an EX4500 switch to form a Virtual Chassis.

Table 1 describes the Virtual Chassis components and the Junos OS release running on switches that you need to consider when you plan your EX4200, EX4500, and EX4550 Virtual Chassis configuration.

Table 1: Virtual Chassis Components to Consider When Planning an EX4200, EX4500, and EX4550 Virtual Chassis

Virtual Chassis Components

Junos OS Release Running on the Member Switches

Virtual Chassis Details

EX4200 switches only

Junos OS Release 9.0 and later

You can interconnect two to ten EX4200 switches to form a Virtual Chassis composed exclusively of EX4200 switches.

EX4500 switches only

Junos OS Releases 11.1, 11.2, and 11.3

You can interconnect two EX4500 switches into a Virtual Chassis composed exclusively of EX4500 switches.

Junos OS Release 11.4 or later

You can interconnect up to ten EX4500 switches into a Virtual Chassis composed exclusively of EX4500 switches.

EX4550 switches only

Junos OS Release 12.2 or later

You can interconnect up to ten EX4550 switches into a Virtual Chassis composed exclusively of EX4550 switches.

EX4200, EX4500, and EX4550 switches

Junos OS Release 11.1

You can interconnect up to two EX4500 switches and up to eight EX4200 switches into a mixed Virtual Chassis.

EX4500 switches must always be configured in the master and backup roles.

Junos OS Releases 11.2 and 11.3

You can interconnect up to two EX4500 switches and up to eight EX4200 switches into a mixed Virtual Chassis.

The same type of switch must act in the master and backup roles.

Junos OS Release 11.4 or later

You can interconnect up to ten total EX4200 and EX4500 switches into a mixed Virtual Chassis .

Any switch can be configured in any role in any configuration.

Junos OS Release 12.2 or later

You can interconnect up to ten total EX4200, EX4500, and EX4550 switches into a mixed Virtual Chassis.

Any switch can be configured in any role in any configuration.

Table 2 describes the cabling requirements for a Virtual Chassis.

Table 2: Cabling Requirements for a Virtual Chassis

Distance Between Virtual Chassis Members

Virtual Chassis Cable Lengths Supported

Details

Up to 0.5 m

0.5 m

You can interconnect EX4200, EX4500, and EX4550 switches into a Virtual Chassis through Virtual Chassis ports (VCPs) using the 0.5-meter Virtual Chassis cable.

  • This Virtual Chassis cable is supplied with an EX4200 switch.

  • You must order this cable separately for EX4500 and EX4550 switches, including EX4500 switches that are shipped with a preinstalled Virtual Chassis module.

0.5 m through 5 m

1 m, 3 m, and 5 m

You must order these cables separately for EX4200, EX4500, and EX4550 switches, including EX4500 switches that are shipped with a preinstalled Virtual Chassis module.

Greater than 5 m

  • To interconnect EX4200 switches that are installed farther apart than 5 m, you must configure the SFP, SPF+, or XFP uplink module ports or the SFP network ports in the EX4200-24F switch as VCPs and use them to interconnect the switches.

  • To interconnect EX4500 switches that are installed farther apart than 5 m, you must configure either the uplink module ports or the SFP+ network ports as VCPs and use them to interconnect the switches.

  • To interconnect EX4550 switches that are installed farther apart than 5 m, you must configure either the expansion module ports or the network ports as VCPs and use them to interconnect the switches.

Note

With separately ordered Virtual Chassis cables, you can use the cable connector retainers provided with the original cable; you can also use separately ordered Virtual Chassis cable connector retainers.