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Line-Card Chassis RE-C1800 Routing Engines


Routing Engine Functions

The Routing Engine runs Junos OS. Software processes that run on the Routing Engine maintain the routing tables, manage the routing protocols used on the router, control the router interfaces, control some chassis components, and provide the interface for system management and user access to the router.

Line-Card Chassis Routing Engine Slots

You can install one or two Routing Engines in each LCC. If two Routing Engines are installed, one functions as the master and the other acts as the backup. The Routing Engines install into the upper rear of the chassis in the slots labeled RE0 and RE1. Each RE-C1800 Routing Engine requires an LCC-CB to be installed in the adjacent slot. RE0 installs below CB0, and RE1 installs above CB1. A Routing Engine does not power up without a Control Board present in the adjacent slot.


For high-availability features such as graceful routing-engine switchover (GRES), two Routing Engines are required in all routers in the routing matrix, including the TX Matrix Plus router and all LCC.

RE-C1800 Routing Engine Description

Each RE-C1800 Routing Engine 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.

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

The faceplate of the RE-C1800 Routing Engine contains the following components:

  • USB port—Provides a removable media interface through which you can install the Junos OS manually. Junos supports USB version 1.1 and version 2.0 devices.

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

  • Two solid-state disk (SSD) slots—Provides secondary storage for log files, memory dumps, and rebooting the system if the CompactFlash card fails.

  • Reset button—Reboots the Routing Engine when pressed.

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

  • Four LEDs—CF, Disk1,Disk2, and ONLINE.