When a router Line Card Controller (LCC) disregards Physical Interface Card (PIC) messages, it can be due to hardware, compatibility, or software problems. This article provides possible reasons for the loss of proper synchronization between the LCC and PIC for smooth network performance.

Repeated log messages indicating that the LCC is ignoring PIC messages (e.g., “LCC ignoring PIC message on LCC”) with potential impacts on network connectivity and stability. The issue could be caused by hardware faults, software bugs, or misconfigurations in the PIC or LCC.

The below logs indicate that the LCC is receiving messages from a PIC, but it is ignoring them. This can occur for various reasons, and here are some possible explanations and troubleshooting steps:

Mar 12 19:13:30 LCC ignoring PIC message on LCC

Mar 12 19:13:30 LCC ignoring PIC message on LCC

Mar 12 19:13:30 LCC ignoring PIC message on LCC

Mar 12 19:13:30 LCC ignoring PIC message on LCC

Mar 12 19:14:21 LCC ignoring PIC message on LCC

Mar 12 19:14:21 LCC ignoring PIC message on LCC

Mar 12 19:17:48 LCC ignoring PIC message on LCC

Mar 12 19:17:50 LCC ignoring PIC message on LCC

Mar 12 19:18:56 LCC ignoring PIC message on LCC

Mar 12 19:19:00 LCC ignoring PIC message on LCC

Possible Causes:

• The LCC may be receiving unexpected or malformed messages from the PIC.
• The PIC and LCC may have configuration mismatches, or the PIC may not be compatible with the specific LCC hardware or Junos software version.
• If there is intermittent connectivity loss between the PIC and the LCC, it could result in the LCC ignoring messages until communication is re-established.

For further troubleshooting, please contact Juniper Support.