M320 Re-A-1800 Routing Engine Description; Routing Engine Components; Figure 12: Routing Engine 2000 - Juniper M320 Hardware Manual

M320 Multiservice Edge Router Hardware Guide
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M320 RE-A-1800 Routing Engine Description

Routing Engine Components

28

Figure 12: Routing Engine 2000

On the RE-A-2000-4096 Routing Engine, the boot sequence for the storage media is as
follows: USB device (if present), then the CompactFlash card (if present), then the hard
disk.
The device from which the router boots is called the primary boot device, and the other
device is the alternate boot device.
NOTE: If the router boots from an alternate boot device, a yellow alarm lights
the LED on the router's craft interface.
M320 Connector Interface Panel (CIP) Description on page 13
M320 Routing Engine Description on page 24
Replacing an M320 Routing Engine on page 216
Routing Engine Components on page 28
Routing Engine Boot Sequence on page 30
Each Routing Engine (shown in
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. See
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.
Figure 13 on page 29 and
Figure 15 on page 30. Junos supports USB version 1.0.
Figure 14 on page 29) consists
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