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    Switch Fabric Module in an EX9208 Switch

    The Switch Fabric serves as the central nonblocking matrix through which all network data passes.

    Switch Fabric (SF) modules are installed horizontally in slots labeled 0 and 1 on the chassis. You can install either one or two SF modules in an EX9208 switch. A base configuration EX9208 switch has only one SF module. See EX9208 Switch Configurations. You can add a second SF module to the configuration for host subsystem redundancy. If two SF modules are installed, one SF module functions as the master and the other functions as the backup. If the master SF module or its components fails or is removed the backup module takes the role of master. See Understanding EX9208 Switch Component and Functionality Redundancy.

    The Routing Engine (RE) module installs directly into a slot on the SF module. The Switch Fabric contains logic that determines which Routing Engine is the master. The master Routing Engine controls many internal functions of the SF module.

    The backup SF module is hot-insertable and hot-removable, but the master SF module is hot-pluggable. If there is only one SF module, you must install it in slot 0.

    Key functions of the Switch Fabric are:

    • Monitor and control system functions
    • Interconnection of all line cards
    • Clocking, system resets, and booting control
    • Routing Engine carrier

    Figure 1 shows the SF module in an EX9208 switch.

    Figure 1: SF Module in an EX9208 Switch

    SF Module in an EX9208 Switch

    The SF modules install horizontally into the front of the chassis in the slots labeled 0 and 1. If any slots are empty, you must install a blank panel.

    The SF module has the following components:

    • Chassis management Ethernet switch
    • I2C bus logic, used for low-level communication with each component
    • Component redundancy circuitry
    • Control Board/Routing Engine mastership mechanism
    • Gigabit Ethernet switch that is connected to the embedded CPU complex on all components
    • Control field-programmable gate array (FPGA)—Provides the Peripheral Component Interconnect (PCI) interface to the Routing Engine
    • 1000Base-T Ethernet controller—Provides a 1-Gbps Ethernet link between the Routing Engines
    • Ethernet switch—Provides 1-Gbps link speeds between the Routing Engine and the line cards
    • External clock interface—Allows BITS or GPS clock source input to the centralized timing circuit, or allows centralized timing to be output to BITS or GPS
    • Circuits for chassis management and control
    • Power circuits for the Routing Engine and the Switch Fabric
    • SF module LEDs—Indicate system status. See Switch Fabric Module LEDs in an EX9208 Switch.
    • Ejector levers—Used for installing and removing the SF module
    • Captive screws—Secure the SF module in place

    Published: 2013-04-02