M320 Control Board (Cb) Description - Juniper M320 Hardware Manual

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M320 Control Board (CB) Description

Copyright © 2010, Juniper Networks, Inc.
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USB port—Provides a removable media interface through which you can install the
Junos OS manually. The Junos OS supports USB version 1.0.
LED—Indicates disk activity for the internal IDE interface. It does not necessarily indicate
routing-related activity.
Interfaces for out-of-band management access—Provide information about
Routing Engine status to devices (console, laptop, or terminal server) that can be
attached to access ports located on the Connector Interface Panel (CIP).
Each Routing Engine has one 10/100-Mbps Ethernet port for connecting to a
management network, and two asynchronous serial ports—one for connecting to a
console and one for connecting to a modem or other auxiliary device.
EEPROM—Stores the serial number of the Routing Engine.
Reset button—Reboots the Routing Engine when pressed.
On the RE-A-2000-4096 Routing Engine, the boot sequence for the storage media is as
follows: USB device (if present), then the CompactFlash card (if present), then the hard
disk.
The device from which the router boots is called the primary boot device, and the other
device is the alternate boot device.
NOTE: If the router boots from an alternate boot device, a yellow alarm lights
the LED on the router's craft interface.
M320 Routing Engine Ports on page 26
M320 Routing Engine Description on page 19
Replacing an M320 Routing Engine on page 166
Each CB works with an adjacent Routing Engine to provide control and monitoring
functions for the router (see Figure 12 on page 24). These functions include determining
Routing Engine mastership, controlling power and reset for the other router components,
monitoring and controlling fan speed, and monitoring system status.
You can install one or two CBs in the router. They install into the upper rear of the chassis
in the slots labeled and
CB0
to as CB-0 and CB-1 , top to bottom). If two CBs are installed, one functions as the master
CB and the other as its backup. If the master fails or is removed, the backup restarts and
becomes the master.
Each CB requires a Routing Engine to be installed in the adjacent slot.
RE0 , and CB1 installs below
in the adjacent slot.
CBs are hot-pluggable.
Chapter 2: M320 Hardware Components
(referred to as and
CB1 CB-0
RE1 . A CB cannot function if a Routing Engine is not present
, top to bottom) (referred
CB-1
CB0 installs above
23