Supported Cb-Re; Cb-Re Function; Cb-Re Slots; Cb-Re Interface Ports - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide

Supported CB-RE

CB-RE Function

CB-RE Slots

CB-RE Interface Ports

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The CB-RE is hot-pluggable. Some key attributes of the MX2020 CB-RE are:
CB-RE into one FRU.
Air diverter to isolate upper and lower cooling zones.
The MX2020 router supports the following CB-RE:
RE-MX2000-1800x4 supported for Junos OS Release 12.3R2 and later.
The CB-RE runs the Junos OS. Software processes that run on the CB-RE 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.
The user can install one or two CB-REs in the router. Each CB-RE is a combined Routing
Engine and Control Board in one unit. A USB port on the CB-RE accepts a USB memory
device that allows you to load Junos OS. The CB-RE installs into the front of the chassis
in vertical slots labeled and
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and the other acts as the backup. If the master CB-RE fails or is removed and the backup
is configured appropriately, the backup takes over as the master. If no CB-RE is installed
in a slot, install a blank panel in the slot.
A minimum of one CB-RE must be installed in either slot
CAUTION: If one of the CB-REs fails, do not remove the failed CB-RE until
you have a replacement or blank panel to install.
Three ports, located on the CB-RE, connect the CB-RE to one or more external devices
on which system administrators can issue Junos OS command-line interface (CLI)
commands to manage the router. In addition, four ports located on the CB-RE include,
two 10 Gigabit Ethernet SFP+ interface connectors supporting hardware diagnostics
(JCS port testing), and two external clock interfaces for BITS and GPS function.
The CB-RE interface ports with the indicated labels function as follows:
—Connects the CB-RE to a laptop, modem, or other auxiliary device through a
AUX
serial cable with an RJ-45 connector.
CONSOLE —Connects the CB-RE to a system console through a serial cable with an
RJ-45 connector.
. If two CB-REs are installed, one functions as the master
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or slot at all times.
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