Re-S-1800 Routing Engine Boot Sequence; Figure 14: Routing Engine-Re-S-1800 - Juniper MX480 Hardware Manual

MX480 3D Universal Edge Router Hardware Guide
26
Ethernet
Auxiliary
port port
Extractor
clip
Console USB Reset
port port button
Each 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.
USB port—Provides a removable media interface through which you can install the
Junos OS manually. Junos OS supports USB version 1.0.
CompactFlash card—Provides primary storage for software images, configuration files,
and microcode. The CompactFlash card is fixed and is inaccessible from outside the
router.
Solid State Disk (SSD)—Provides secondary storage for log files, memory dumps, and
rebooting the system if the CompactFlash card fails.
Interface ports—The
AUX
devices. 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.
Reset button—Reboots the Routing Engine when pressed.
Online/Offline button—Takes the Routing Engine online or offline when pressed.
Extractor clips—Used for inserting and extracting the Routing Engine.
Captive screws—Secure the Routing Engine in place.
NOTE: For specific information about Routing Engine components (for
example, the amount of DRAM), issue the
command.

RE-S-1800 Routing Engine Boot Sequence

The router is shipped with the Junos OS preinstalled on the Routing Engine. There are
three copies of software:
One copy on the CompactFlash card in the Routing Engine.
SSD SSD
slot 1 slot 2
Extractor
clip
, , and
CONSOLE ETHERNET
provide access to management
show chassis routing-engine
Copyright © 2011, Juniper Networks, Inc.