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    Routing Engine Module in an EX9208 Switch

    The Routing Engine is housed in a Routing Engine module (RE module). The Routing Engine runs Junos OS. Software processes that run on the Routing Engine maintain the routing tables, manage the routing protocols used on the switch, control the switch interfaces, control some chassis components, and provide the interface for system management and user access to the switch.

    Routing Engine (RE) modules are installed directly into Switch Fabric (SF) modules. Each RE module houses one Routing Engine. An EX9208 switch can have either one or two Routing Engines. If two Routing Engines are installed, one functions as the master and the other acts as the backup. If the master Routing Engine fails or is removed, the backup takes over as the master.

    The backup Routing Engine is hot-insertable and hot-removable, but the master Routing Engine is hot-pluggable. If only one RE module is installed, you must disable the switch before removing the RE module.

    A base configuration EX9208 switch has only one RE module. See EX9208 Switch Configurations. You can add a second RE module to the configuration for a redundant host subsystem. See Understanding EX9208 Switch Component and Functionality Redundancy.

    Figure 1: RE Module in an EX9208 Switch

    RE Module in an EX9208 Switch

    Note: We recommend that you install two RE modules for redundancy.

    The RE module performs the following functions:

    • Provides full fabric connectivity to all line cards installed in the chassis
    • Through the switching plane, provides switching functionality to the switch
    • Powers the line cards on and off
    • Controls system resets and the boot sequence for the switch
    • Monitors and controls the fan speed, power status for various chassis components, and craft interface LEDs

    The RE module has the following components:

    • Auxiliary (AUX) port—Connects the RE module to a modem or other auxiliary device.
    • Console (CON) port—Connects the RE module to a system console through a cable with an RJ-45 connector. See Connecting an EX9200 Switch to a Management Console or an Auxiliary Device.
    • Ethernet (<...>) port—Connects the RE module through an Ethernet connection to a management LAN (or any other device that plugs into an Ethernet connection) for out-of-band management. See Connecting an EX9200 Switch to a Network for Out-of-Band Management.
    • USB port—Provides a removable media interface through which you can install the Junos OS manually. See USB Port Specifications for an EX Series Switch.
    • Solid-state drive (SSD)—Provides secondary storage for log files, memory dumps, and rebooting the system if the CompactFlash card fails.

      the CompactFlash card provides primary storage for software images, configuration files, and microcode. The CompactFlash card is fixed and is inaccessible from outside the switch.

    • Reset (RESET) button—Reboots the Routing Engine when pressed.
    • Status LEDs—Indicates the status of the Routing Engine. Each RE module has four LEDs labeled MASTER, STORAGE, ONLINE, and OK/FAIL on the faceplate.
    • Online/Offline (ONLINE/OFFLINE) button—Turns the Routing Engine online or offline when pressed.
    • Extractor cilp—Used for installing and removing the RE module.
    • Captive screws—Secure the RE module in place.

    The switch ships with Junos OS preinstalled on the Routing Engine. There are three copies of the software:

    • One copy on the CompactFlash card in the Routing Engine.
    • One copy on the hard disk in the Routing Engine.
    • One copy on a USB flash drive that can be inserted into the slot on the Routing Engine faceplate.

    The Routing Engine boots from the storage media in this order: the USB device (if present), then the CompactFlash card, then the SSD, and then the LAN.

    Published: 2013-04-02