Boot Sequence; Figure 10: Routing Engine - Juniper M7i Hardware Manual

M7i Multiservice Edge Router Hardware Guide

Boot Sequence

18

Figure 10: Routing Engine

The Routing Engine (shown in
following components:
CPU—Runs Junos OS to maintain the router's routing tables and routing protocols. It
has a Pentium-class processor.
SDRAM—Provides storage for the routing and forwarding tables and for other Routing
Engine processes.
CompactFlash card—This disk is optional. If installed, it provides primary storage. It
can accommodate software images, configuration files, and microcode.
Hard disk—If no CompactFlash card is installed, provides primary storage for software
images, configuration files, and microcode. If an CompactFlash card is installed, the
hard disk provides secondary storage for log files and memory dumps, and can reboot
the system if the CompactFlash card fails.
PC card slot—Accepts a removable PC card, which stores software images for system
upgrades.
Four LEDs—A green LED labeled
, and a green LED labeled
FAIL
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 Routing Engine.
I2C/EEPROM—Stores the serial number of the Routing Engine.
Reset button—Reboots the Routing Engine when pressed.
Offline button—Powers down the Routing Engine when pressed.
Thumbscrews—Secure the Routing Engine in the chassis.
The disk from which the router boots is called the primary boot device, and the other disk
is the alternate boot device.
Figure 10 on page 18) is a two-board system with the
HDD , a blue LED labeled
indicate Routing Engine status.
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MASTER , a red LED labeled