MX2020 Troubleshooting Resources
To troubleshoot an MX2020 router, you use the Junos OS command-line interface (CLI), alarms, devices connected to the alarm relay contacts, and LEDs on both the components and craft interface.
LEDs—When the Routing Engine detects an alarm condition, it lights the red or yellow alarm LED on the craft interface. In addition, you can also use the component-specific LEDs on the craft interface and on the faceplate of a component to troubleshoot the routing matrix.
Alarm devices connected to the alarm relay contact—When a red or yellow alarm occurs, it trips the corresponding alarm relay.
CLI—The CLI is the primary tool for controlling and troubleshooting hardware, Junos OS, routing protocols, and network connectivity. CLI commands display information about routing tables, information specific to routing protocols, and information about network connectivity derived from the
You enter CLI commands on one or more external management devices connected to ports on the Routing Engine.
For information about using the CLI to troubleshoot the Junos OS, see the appropriate Junos OS configuration guide.
JTAC—If you need assistance during troubleshooting, you can contact the Juniper Networks Technical Assistance Center (JTAC) by using the Web or by telephone. If you encounter software problems, or problems with hardware components not discussed here, contact JTAC.
Chassis and Interface Alarm Messages
When the Control Board and Routing Engine (CB-RE) detects an alarm condition, it lights the red or yellow alarm LED on the craft interface as appropriate, trips the alarm relay, and reports the cause of the alarm in the craft interface. To view a more detailed description of the alarm cause, issue the show chassis alarms command:
There are two classes of alarm messages:
Chassis alarms indicate a problem with a chassis component such as the cooling system or power system.
Interface alarms indicate a problem with a specific network interface.
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 displays system status messages and allows you to troubleshoot the MX2020 router. The craft interface is located on the upper front of the router. It contains LEDs, buttons for 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—The host subsystem consists of a Control Board with Routing Engine (CB-RE). Three LEDs,
OFFLINE, indicate the status of the Routing Engine function of the host subsystem. A green
MASTERLED indicates that the host is functioning as the master. The
ONLINELED indicates that the host is online. The
OFFLINELED indicates that the host is installed but the Routing Engine is offline. The Routing Engine component of the host subsystem LEDs located on the upper right of the craft interface and labeled
Power supply module LEDs—A set of eighteen bicolor LEDs, labeled
PSM, indicates the status of each PSM. Green indicates that the PSM is functioning normally. Red indicates that the PSM is not functioning normally. The PSM LEDs are located in the top of the craft interface, and are labeled
8for the bottom PSMs, and
17for the top PSMs.
Line card LEDs—Twenty bicolor LEDs,
LC9, for the bottom ten line cards (MPCs), and
LC19, for the top ten line cards, indicate the status. Green indicates the line card is online, green blinking indicates that the line card is booting, and the red indicates that a failure. The line card LEDs located along the bottom of the craft interface.
SFB LEDs—Eight bicolor LEDs,
SFB7, indicate the status of each SFB. Green indicates the SFB is online, green blinking indicates the SFB is booting, and red indicates a failure. The SFB LEDs are located along the middle of the craft interface along the bottom.
CB-RE—Two bicolor LEDs,
CB-RE1, indicate the status of each CB-RE. Green indicates the SFB is online, green blinking indicates the SFB is booting, and red indicates a failure. The CB-RE LEDs are located along the bottom far left and far right of the craft interface.
Fan Tray LEDs—Four bicolor LEDs,
3, indicates that the status of the upper two and lower two fan trays. Green indicates the fan trays are functioning normally, and red indicates that a fan tray has failed. The fan tray LEDs are located on the upper middle of the craft interface.
The following LEDs are located on various router components and display the status of those components:
MPC LED—One LED labeled
OK/FAILon each MPC faceplate indicates the MPC's status. For more information, see the MX Series Interface Module Reference.
MIC LED—One LED labeled
OK/FAILon each MIC faceplate indicates the MIC's status. For more information, see the MX Series Interface Module Reference.
SFB LEDs—One LED, labeled
OK/FAIL, on each SFB faceplate indicate the status of the SFB. If no LEDs are lit, the master CB-RE might still be booting or the SFB is not receiving power.
Control Board and Routing Engine (CB-RE) LEDs—For the Control Board portion of the CB-RE, there is one bicolor LED, labeled
GPS. For the Routing Engine portion of the CB-RE, there are three LEDs, labeled
OK/FAIL. These LEDs on the faceplate indicate the status of the CB-RE.
Even though the Control Board and Routing Engine (CB-RE) are combined into one unit; the LED functionality is separate for the Control Board and Routing Engine.
AC delta or wye PDM LEDs—One LED for each input terminal block indicating the input feed status.
DC PDM LEDs—One LED on each PDM next to each of the nine –48VDC power feeds indicates the status of that PDM incoming power.
AC or DC PSM LEDs—Four LEDs, labeled
INP1, on each power supply module faceplate indicates the status of that power supply module.