Understanding File Storage In An Ex8200 Virtual Chassis; Understanding Ex8200 Virtual Chassis Compatibility Requirements - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Complete Software Guide for Junos
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Understanding File Storage in an EX8200 Virtual Chassis

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Understanding EX8200 Virtual Chassis Compatibility Requirements

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OS for EX Series Ethernet Switches, Release 10.4
EX8200 Virtual Chassis Overview on page 1071
Connecting an EX Series Switch to a Network for Out-of-Band Management
An XRE200 External Routing Engine is shipped with two 160 GB Hard Disk Drive (HDD)
modules. The HDD modules are fully redundant file storage units; all content that is
stored on one HDD module is stored on the other HDD module. This redundancy helps
ensure that no files are lost if a single HDD module is unusable for any reason.
In an EX8200 Virtual Chassis, the master external Routing Engine is responsible for most
Routing Engine functions for all switches in the Virtual Chassis. This responsibility extends
to file storage; the external Routing Engine stores many of the files related to the Virtual
Chassis, including:
Software packages—You can use the XRE200 External Routing Engine software
package to upgrade all devices in the Virtual Chassis simultaneously. You can store
these packages on the external Routing Engine for the entire Virtual Chassis.
Log files—All log files related to all devices in the EX8200 Virtual Chassis are stored
on the XRE200 External Routing Engines. The EX8200 member switches continue to
store logs related to their local functions.
Configuration files—The XRE200 External Routing Engine has its own configuration
file. This configuration file configures the Virtual Chassis itself and configures the
network parameters for all network traffic entering and leaving the Virtual Chassis.
EX8200 Virtual Chassis Overview on page 1071
Hard Disk Drive (HDD) Module in an XRE200 External Routing Engine
For Juniper Networks EX8200 Ethernet Switches to be interconnected into a Virtual
Chassis, the switches and the XRE200 External Routing Engines must be running the
same software versions. The master external Routing Engine checks the hardware version,
the Juniper Networks Junos operating system (Junos OS) version, and other component
versions running in a switch that is physically interconnected to its Virtual Chassis port
(VCP). A switch that is running a different version of software will not be allowed to join
the Virtual Chassis configuration.
After an EX8200 Virtual Chassis is connected, software upgrades for all switches and
external Routing Engines in the Virtual Chassis can be performed simultaneously. This
process ensures all devices are running the same version of Junos OS.
Different models in the EX8200 line of switches can be members of the same Virtual
Chassis; for instance, an XRE200 External Routing Engine can be used to connect a
Virtual Chassis composed of one EX8208 switch and one EX8216 switch.
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