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T320 RE-1600 Description

Figure 1: T320 Routing Engine 1600
T320 Routing Engine 1600

The Routing Engine 1600 (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.

  • 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 millions of packets per second (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.

  • Reset button—Reboots the Routing Engine when pressed.

  • 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 slots—Accept a removable PC card, which stores software images for system upgrades.

    The PC card slots accept a Type I PC Card, as defined in the PC Card Standard published by the Personal Computer Memory Card International Association (PCMCIA). The router is shipped with a PC Card that contains Junos OS. The PC Card can be used to copy Junos OS from the PC Card onto the Routing Engine. You can also copy Junos OS from the Routing Engine onto a PC Card, for example, to create a backup copy of upgrade software that you have obtained from Juniper Networks. Instructions for copying software to a PC Card are available at the Juniper Networks Support Web site (; after logging in, navigate to the Customer Support Center, then to the download page for Junos OS.

The disk from which the router boots is called the primary boot device, and the other disk is the alternate boot device.The RE-1600 Routing Engine boots from the storage media in this order: the PC Card in SLOT 0 (if present), then the PC Card in SLOT 1 (if present), then the CompactFlash card (if present), then the hard disk.


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