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T320 RE-2000 Description

Figure 1: Routing Engine 2000 (RE-2000)
Routing Engine 2000 (RE-2000)

Each RE-2000 (shown in Figure 1) consists of 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.

  • EEPROM—Stores the serial number of the Routing Engine.

  • Interfaces for management access—Provide information about Routing Engine status to devices (console, laptop, or terminal server) connected to the Routing Engine ports located on the CIP.

  • CompactFlash card—Provides primary storage for software images, configuration files, and microcode. The fixed CompactFlash card 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.

The disk from which the router boots is called the primary boot device, and the other disk is the alternate boot device. The RE-2000 Routing Engine boots from the storage media in this order: the USB device, then the CompactFlash card (if present), then the hard disk, then the LAN.


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

The faceplate of the RE-2000 contains the following:

  • USB port—Provides a removable media interface through which you can install the Junos OS manually. Junos OS supports USB version 1.0.

  • Reset button—Reboots the Routing Engine when pressed.

  • Offline button—Takes the Routing Engine offline when pressed.

  • Extractor clips—Control the locking system that secures the Routing Engine.

  • LEDs—T320 RE-2000 LEDs describes the functions of these LEDs.