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Understanding Configuration File Management in an EX8200 Virtual Chassis

You configure all devices in an EX8200 Virtual Chassis by logging in to the primary external Routing Engine. The configuration file on the primary XRE200 External Routing Engine controls the configuration for all member switches and external Routing Engines in the Virtual Chassis.

In Juniper Networks Junos operating system (Junos OS) Release 12.2 or earlier releases, the configuration file used to configure the EX8200 Virtual Chassis was saved on the primary and backup external Routing Engines only when configuration changes were committed.

Beginning with Junos OS Release 12.3, the configuration file used to configure the EX8200 Virtual Chassis is saved on the primary and the backup external Routing Engines, on all Switch Fabric and Routing Engine (SRE) modules of all EX8208 member switches, and on all Routing Engine (RE) modules of all member EX8216 switches whenever it is committed. This configuration file saving behavior happens by default and is not user configurable.

The configuration changes allow you to configure parameters specific for an individual member switch in an EX8200 Virtual Chassis. You can now use groups to set and apply configuration parameters to a member switch only. For information about configuring parameters specific to a member switch in the configuration file for the EX8200 Virtual Chassis, see Using Groups to Configure Power Supply Management, Power Budgets, and LCD Menus on EX8200 Member Switches in an EX8200 Virtual Chassis (CLI Procedure).

The configuration file from the EX8200 Virtual Chassis remains on both SRE modules of all EX8208 member switches and on both RE modules of all EX8216 member switches even after the switch is removed from the Virtual Chassis.