M120 Routing Engine Description; Figure 10: M120 Routing Engine - Juniper M120 Hardware Manual

M120 Multiservice Edge Router Hardware Guide

M120 Routing Engine Description

22
M120 Control Board (CB) Description on page 47
The Routing Engine runs the Junos OS. The software processes that run on the Routing
Engine maintain the routing tables, manage the routing protocols used on the router,
control the router interfaces, control some chassis components, and provide the interface
for system management and user access to the router.
You can install one or two Routing Engines in the router. The Routing Engines install into
the rear of the chassis in vertical slots directly into the CB labeled
Routing Engines are installed, one functions as the master and the other acts as the
backup. If the master Routing Engine fails or is removed, and the backup is configured
appropriately, the backup takes over as the master. For detailed information, see
the M120 Host Subsystem Offline" on page
If the host system is redundant, the backup Routing Engine is hot-removable and
hot-insertable, but the master Routing Engine is hot-pluggable. A Routing Engine that is
not redundant is hot-pluggable. Each Routing Engine requires a CB to be installed in the
adjacent slot. installs below
RE0
not power up if it is not installed into the CB.
NOTE: If two Routing Engines are installed, they must both be the same
hardware model.
There is a USB memory device that connects directly into the front of Routing Engine.
The USB port allows you to plug in a USB keychain device.

Figure 10: M120 Routing Engine

267.
, and installs below
CB0 RE1
Copyright © 2018, Juniper Networks, Inc.
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CB0 CB1
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. A Routing Engine does
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