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:
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Reset the PIC.
-
Toggle the framing mode.
In configuration mode, go to the
[edit interfaces]hierarchy level.user@host1# edit interfaces interface name
Toggle the framing mode. In the following configuration, WAN-PHY mode is toggled.
[edit interfaces interface-name is in the et-fpc/pic/port user@host1# set framing wan-phy user@host1# commit user@host1# framing { user@host1# wan-phy; user@host1# } user@host1# delete framing user@host1# commitReset the PIC
user@host1# request chassis fpc slot x offline user@host1# request chassis fpc slot x online