T640 RE-2000 Description

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. It has a Pentium-class processor.
• 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 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.
• 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.

Figure 1: Routing Engine 2000 (RE-2000)

• USB port—Provides a removable media interface through which you can install the Junos OS manually. The 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.
• HDD and ONLINE LEDs

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.