Troubleshooting Resources for MX960 Routers

Command-Line Interface

The Junos OS command-line interface (CLI) is the primary tool for controlling and troubleshooting router hardware, the Junos OS, routing protocols, and network connectivity. CLI commands display information from routing tables, information specific to routing protocols, and information about network connectivity derived from the ping and traceroute utilities.

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.

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:

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 line card LEDs are located along the bottom of the craft interface.
• SCB LEDs—Two LEDs, OK and FAIL, indicate the status of each SCB. Green indicates OK and red indicates a failure. The SCB LEDs are located on the left of the craft interface along the bottom.
• Fan LEDs—Two LEDs indicate the status of the fans. Green indicates the fans are functioning normally and red indicates a fan has failed. The fan LEDs are located on the upper left of the craft interface.

Component LEDs

The following LEDs are located on various router components and display the status of those components:

• DPC LED—One LED labeled OK/FAIL on each DPC faceplate indicates the DPC's status. For more information, see the MX Series 3D Universal Edge Routers Line Card Guide .
• FPC LED—One LED labeled OK/FAIL on each FPC faceplate indicates the FPC's status.
• MPC LED—One LED labeled OK/FAIL on each FPC faceplate indicates the FPC's status.
• MIC LED—One LED labeled OK/FAIL on each MIC faceplate indicates the MIC's status. For more information, see the MX Series 3D Universal Edge Routers Line Card Guide .
• PIC LED—One LED labeled OK/FAIL on each PIC faceplate indicates the PIC's status. For more information, see the MX Series 3D Universal Edge Routers Line Card Guide .
• SCB LEDs—Three LEDs, labeled FABRIC ACTIVE, FABRIC ONLY, and OK/FAIL, on each SCB faceplate indicate the status of the SCB. If no LEDs are lit, the master RE might still be booting or the SCB is not receiving power.
• Routing Engine LEDs—Four LEDs, labeled MASTER, HDD, ONLINE, and FAIL on each Routing Engine faceplate indicate the status of the Routing Engine and hard disk drive.
• Power supply LEDs—Two LEDs on each power supply faceplate indicate the status of that power supply.

Juniper Networks Technical Assistance Center

If you need assistance during troubleshooting, you can contact the Juniper Networks Technical Assistance Center (JTAC) by using the Web or by telephone.