Figure 11: RE-A-1800x2 Routing Engine
g006038
Extractor clip
Extractor clip
USB port
Reset
button
SSD
slot 2
SSD
slot 1
Online/Offline
button
•
Routing Engine Components on page 23
•
Routing Engine Boot Sequence on page 24
Routing Engine Components
Each Routing Engine (shown in Figure 10 on page 22) 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.
•
USB port—Provides a removable media interface through which you can install the
Junos OS manually. See Figure 12 on page 24. Junos supports USB version 1.0.
•
CompactFlash card—Provides primary storage for software images, configuration files,
and microcode. The disk is a fixed compact flash 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.
•
LED—Indicates disk activity for the internal IDE interface. It does not necessarily indicate
routing-related activity.
NOTE: The LEDs that report host module status (including Routing Engine
status) are on the craft interface rather than the Routing Engine faceplate.
•
HDD LED—Indicates disk activity for the hard disk drive.
•
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 craft interface.
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.
23Copyright © 2018, Juniper Networks, Inc.
Chapter 5: Host Subsystem Components and Descriptions
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