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Troubleshoot: 10-Gigabit Ethernet Port Stuck in Down State

Learn how to troubleshoot a 10-Gigabit Ethernet port stuck in a down state. Discover steps to diagnose and resolve issues with Dense Port Concentrator (DPC) or Packet Interface Card (PIC) states on Juniper Networks routers.

Problem

10-Gigabit Ethernet port is stuck in Dense Port Concentrator (DPC) or Packet Interface Card (PIC) down state.

Symptoms

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

Cause

Disable and reenable the interface and then reset the the transceiver and cable. If the interface remains in the down state, it may be stuck in DPC or PIC down state.

Does the router function normally after you disable and reenable the interface and then reset the transceiver and cable?

Yes:

The system is not stuck in DPC or PIC down state. Disable and reenable the interface or reset the transceiver to resolve the issue.

No:

The interface might be stuck in DPC or PIC down state.

Solution

To resolve the issue

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

This is not a hardware related issue or problem. To resolve this issue, implement one of the following solutions:

  • 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