CHAPTER 4
Host Subsystem Components and
Descriptions
•
MX104 Routing Engine Overview on page 21
•
MX104 Routing Engine Overview on page 24
•
MX104 Routing Engine Overview on page 27
•
Routing Engine Specifications on page 30
•
Supported Routing Engines by Router on page 33
MX104 Routing Engine Overview
The Routing Engine is a Freescale-based PC platform that runs Junos OS. 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 Engine installs into
the front of the chassis. Two USB ports on the Routing Engine accept a USB memory
card that allows you to load Junos OS.
If two 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. The backup Routing Engine is
hot-insertable and hot-removable.
The MX104 router supports the Routing Engine with model number RE-MX104.
Figure 11: MX104 Routing Engine
•
MX104 Routing Engine Components on page 22
•
MX104 Routing Engine Buttons on page 22
21Copyright © 2017, Juniper Networks, Inc.
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