M320 Routing Engine 1600; Figure 10: Routing Engine 1600 - Juniper M320 Hardware Manual

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M320 Routing Engine 1600

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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 Routing Engine Ports on page 26
M320 Routing Engine Description on page 19
Replacing an M320 Routing Engine on page 166

Figure 10: Routing Engine 1600

Each Routing Engine (shown in Figure 10 on page 21) 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.
CompactFlash card—Provides primary storage for software images, configuration files,
and microcode. The CompactFlash card 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.
PC card slots—Accept removable PC cards, which store software images for system
upgrades.
LED—Indicates disk activity for the internal IDE interface. It does not necessarily indicate
routing-related activity.
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 Connector Interface Panel (CIP).
Chapter 2: M320 Hardware Components
21