Routing Engine Components - Juniper Internet Router M160 Hardware Manual

M160 Internet Router Hardware Guide
the master and which is in standby mode (and so performs no functions). By
default, the Routing Engine in the slot labeled
Routing Engine also determines which of the two PCGs is the master.
The Routing Engine is hot-pluggable, as described in Field-Replaceable
Units (FRUs) on page 4. For information about the effect of removing a
Routing Engine, see Host Module on page 22. For replacement instructions,
see "Replacing a Routing Engine" on page 165.

Routing Engine Components

The Routing Engine (shown in Figure 9) is a two-board system
with the following components:
NOTE: The LEDs that report host module status (and by implication Routing Engine
status) are on the craft interface rather than the Routing Engine faceplate. For more
information, see "Host Module LEDs" on page 31.
NOTE: The appearance and position of electronic components or the PC card
slot on your Routing Engine might differ from Figure 9 and other figures in this
24
Host Module
CPU—Runs JUNOS Internet software 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.
Compact flash drive—Provides primary storage for software images,
configuration files, and microcode. The drive is fixed and inaccessible from
outside the router.
Hard disk—Provides secondary storage for log files, memory dumps, and
rebooting the system if the flash drive 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).
EEPROM—Stores the serial number of the Routing Engine.
Reset button—Reboots the Routing Engine when pressed.
is the master. The master
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