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Understanding Software Upgrades in an EX8200 Virtual Chassis

In an EX8200 Virtual Chassis, both XRE200 External Routing Engines and the primary Routing Engines of the member switches must be running the same version of Juniper Networks Junos OS Software. You must upgrade all switches and external Routing Engine to the same version of Junos OS before connecting the Virtual Chassis for the first time.

After the Virtual Chassis is connected, you can upgrade the software for all switches and external Routing Engines in the EX8200 Virtual Chassis through the use of the XRE200 External Routing Engine software package. You identify this software package on the software download site by confirming that “xre200” is listed in the filename as the package-name, for instance, jinstall-ex-xre200-10.4R1.6-domestic-signed.tgz. This software package contains the Junos OS image for the external Routing Engines as well as the software packages for the EX8200 switches. The software packages in the EX8200 Virtual Chassis software package are identical to the software packages for the stand-alone Juniper Networks EX8200 Ethernet Switches; the switches are running the same software regardless of whether they were upgraded with or without the XRE200 External Routing Engine software package.