Juniper Networks MX480 - Manual (Page 174)

Chassis and Interface Alarm Messages
When the Routing Engine detects an alarm condition, it lights the red or yellow alarm
LED on the craft interface as appropriate. To view a more detailed description of the
alarm cause, issue the
show chassis alarms command:
user@host> show chassis alarms
There are two classes of alarm messages:
• Chassis alarms—Indicate a problem with a chassis component such as the cooling
system or power supplies.
• Interface alarms—Indicate a problem with a specific network interface.
Alarm Relay Contacts
The craft interface has two alarm relay contacts for connecting the router to external
alarm devices. Whenever a system condition triggers either the red or yellow alarm on
the craft interface, the alarm relay contacts are also activated. The alarm relay contacts
are located on the upper right of the craft interface.
Craft Interface LEDs
The craft interface is the panel on the front of the router located above the DPC cards
that contains LEDs and buttons that allow you to troubleshoot the router.
LEDs on the craft interface include the following:
• Alarm LEDs—One large red circular LED and one large yellow triangular LED, located
on the upper right of the craft interface, indicate two levels of alarm conditions. The
circular red LED lights to indicate a critical condition that can result in a system
shutdown. The triangular yellow LED lights to indicate a less severe condition that
requires monitoring or maintenance. Both LEDs can be lit simultaneously. A condition
that causes an alarm LED to light also activates the corresponding alarm relay contact
on the craft interface.
• Host subsystem LEDs—Three LEDs, MASTER , ONLINE , and OFFLINE , indicate the status
of the host subsystem. A green MASTER LED indicates that the host is functioning as
the master. The ONLINE LED indicates that the host is online. The OFFLINE LED indicates
that the host is installed but the routing engine is offline. The host subsystem LEDs are
located on the left of the craft interface and are labeled
RE0 and RE1 .
• Power supply LEDs—Two LEDs ( PEM ) indicate the status of each power supply. Green
indicates that the power supply is functioning normally. Red indicates that the power
supply is not functioning normally. The power supply LEDs are located in the center
craft interface, and are labeled
0 through 3 .
• Line card LEDs—Two LEDs, OK and FAIL , indicate the status of each DPC, FPC, or MPC.
Green indicates OK and red indicates a failure. The LEDs are located along the bottom
of the craft interface.
Copyright © 2013, Juniper Networks, Inc. 150
MX480 3D Universal Edge Router Hardware Guide