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    M40e Routing Engine 333

    The Routing Engine (shown in Figure 1) is a two-board system with the following components:

    • CPU—Runs Junos OS to maintain the router's routing tables and routing protocols.
    • DRAM—Provides storage for the routing and forwarding tables and for other Routing Engine processes.
    • CompactFlash card—Provides primary storage for software images, configuration files, and microcode. The drive is a fixed CompactFlash card and is inaccessible from outside the router.
    • Hard disk—Provides secondary storage for log files, memory dumps, and rebooting the system if the CompactFlash card fails.
    • PC Card slot—Accepts a removable PC Card, which stores software images for system upgrades.
    • LED—Indicates disk activity for the internal IDE interface. It does not necessarily indicate routing-related activity.
    • Interfaces for out-of-band management access—Provide information about Routing Engine status to devices (console, laptop, or terminal server) that can be attached to access ports located on the Connector Interface Panel (CIP).

      Each Routing Engine has one 10/100-Mbps Ethernet port for connecting to a management network, and two asynchronous serial ports—one for connecting to a console and one for connecting to a modem or other auxiliary device.

    • EEPROM—Stores the serial number of the Routing Engine.
    • Reset button—Reboots the Routing Engine when pressed.
    • Extractor clips—Control the locking system that secures the Routing Engine in the chassis.

    Note: The appearance and position of electronic components or the PC Card slot on your Routing Engine might differ from Figure 1 and other figures in the documentation that depict the Routing Engine. These differences do not affect Routing Engine installation and removal or functionality.

    Note: For specific information about Routing Engine components (for example, the amount of DRAM), issue the show chassis routing-engine command.

    The disk from which the router boots is called the primary boot device, and the other disk is the alternate boot device.

    The boot sequence for the router:

    • PC Card
    • CompactFlash card
    • Hard disk

    Note: If the router boots from an alternate boot device, a yellow alarm lights the LED on the router’s craft interface.

    Note: If two Routing Engines are installed, they must both be the same hardware model.

    Figure 1: M40e Routing Engine 333

    Image g001596.gif

    Published: 2010-10-28