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

MX2020 3D Universal Edge Router Hardware Guide
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CB-RE Slots

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.

CB-RE Interface Ports

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:
AUX —Connects the CB-RE to a laptop, modem, or other auxiliary device through a
serial cable with an RJ-45 connector.
—Connects the CB-RE to a system console through a serial cable with an
CONSOLE
RJ-45 connector.
MGMT —Connects the CB-RE through an Ethernet connection to a management LAN
(or any other device that plugs into an Ethernet connection) for out-of-band
management. The port uses an autosensing RJ-45 connector to support 10-Mbps or
100-Mbps connections. Two small LEDs on the bottom of the port indicate the
connection in use: the LED flashes yellow or green for a 10-Mbps or 100-Mbps
connection, and the LED is lit green when traffic is passing through the port.
The control board interface ports function as follows:
XGE-0 and XGE-1 —Two SFP+ connects the CB-RE through an Ethernet to support 2 x
10-Gbps connections to any external control box. Two small LEDs on the side of each
SFP+ port indicate the connection in use: the LED flashes yellow when there is no link,
flashes green when there is activity, or is lit green for a 10-Gbps connection.
ExtClk-0 and ExtClk-1 —Connect the CB-RE to an external clock device through a serial
cable with an RJ-45 connector.
MX2020 CB-RE LEDs on page 30
Maintaining the MX2020 Host Subsystem on page 163
. If two CB-REs are installed, one functions as the master
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Copyright © 2013, Juniper Networks, Inc.
or slot at all times.
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