Understanding Software Upgrade in a Virtual Chassis Configuration
A Virtual Chassis configuration can be composed of multiple Juniper Networks EX4200 Ethernet Switches and each member switch is running Juniper Networks JUNOS Software packages. For ease of management, the Virtual Chassis configuration provides flexible methods to upgrade software releases.
A new software release can be upgraded to the entire Virtual Chassis configuration or to a particular member in the Virtual Chassis configuration through a CLI or J-Web command. A user can add software packages to either a single member of the Virtual Chassis configuration or to all members of the Virtual Chassis configuration at the same time.