Routing Engine Srx5K-Re-13-20 Overview - Juniper SRX5600 Hardware Manual

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Routing Engine SRX5K-RE-13-20 Overview

The Routing Engine is an Intel-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 device, control the
device interfaces, control some chassis components, and provide the interface for system management
and user access to the device.
You must install at least one Routing Engine in the services gateway. You can install a second Routing
Engine if both Routing Engines are running Junos OS Release 10.0 or later.
A second Routing Engine is required if you are using the dual chassis cluster control link feature available
in Junos OS Release 10.0 and later. The second Routing Engine does not perform all the functions of a
Routing Engine and does not improve resiliency or redundancy. The second Routing Engine and the Switch
Control Board (SCB) in which it is installed do not constitute a host subsystem. The only function of the
second Routing Engine is to enable the hardware infrastructure that enables the Chassis Cluster Control
1 port on the Services Processing Card (SPC) used for chassis cluster control links.
If you install only one Routing Engine in the services gateway, you must install it in the slot in the front
panel of SCB0. If you install a second Routing Engine to use the dual chassis cluster control link feature,
you install it in the slot in the front panel of SCB1 (see Figure 35 on page 83).
A USB port on the Routing Engine accepts a USB memory card that allows you to load Junos OS.
Figure 35: SRX5K-RE-13-20 Routing Engine
For detailed information about the Routing Engines supported by the services gateway, see the SRX5400,
SRX5600, and SRX5800 Services Gateway Card Reference at www.juniper.net/documentation/.