PFE notification: Illegal packets. The number of cell notifications dropped because the notification has an illegal notification type.

The RMON_EVENT_pfe_illegal_notification message is logged each time the packet forwarding engine (pfe) illegal notification counter is incremented.

When a RMON_EVENT_pfe_illegal_notification event occurs, a message similar to the following is reported:

The cause of this issue is due to an internal issue in the packet forwarding engine. The hardware may be in a state that is causing the invalid notification cell type to be generated.

Examine the following output to help determine the cause of this message:

Look for any related events that occurred at or just before the RMON_EVENT_pfe_illegal_notification message.

Perform these steps:

1. During a maintenance window, as it will impact transit traffic, try the following:

  • Reset the pfe component. (Depending on the network device, this would be an SFM, FEB, SCB, etc.)
  • Move or swap the pfe part, if possible, to an alternate slot.
  • Replace the pfe component with a spare.

2. If the failure messages continue, open a case with your technical support representative to investigate the issue further.

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