Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 

Troubleshooting: 10-Gigabit Ethernet Port Stuck in Down State

 

Problem

Description: 10-Gigabit Ethernet port is stuck in DPC or PIC down state.

Environment: Juniper Networks T Series and MX Series routers. Refer to the related documentation section for more information.

Symptoms: The device has failed to initialize because the Ethernet port is down.

Diagnosis

Try disabling and reenabling the interface and resetting the transceiver and cable. If the interface remains down, it can be stuck in DPC or PIC down state.

Does the router function normally after disabling and reenabling the interface and resetting the transceiver and cable?

Yes:

The system is not stuck in DPC or PIC down state. Disabling and reenabling the interface or resetting the transceiver, and cable resolved the issue.

No:

The interface might be stuck in DPC or PIC down state. Refer to the To resolve the issue section for recovery options.

    Resolution

    To resolve the issue

    From the aforementioned diagnosis, you ascertain that the interface is stuck in DPC or PIC down state.

    This is not a hardware defect. Implement one of the following solutions on the backup Routing Engine to resolve this issue:

    • Reset the PIC.

    • Toggle the framing mode.

    1. In configuration mode, go to the [edit interfaces] hierarchy level.
    2. Toggle the framing mode. In the following configuration, WAN-PHY mode is toggled.
    3. Reset the PIC (T Series Routers)
    4. Reset the PIC (MX Series Routers)