At what point should I become concerned about WAN interface errors? Are they to be expected on circuits with a high load? I searched briefly for a thread that touched upon this but I didn't find any hard numbers. Any advice would be appreciated. Thanks.
i would suggest being concerned about WAN interface errors whenever you see them.
the point will be to determine whether the errors are intermittent and not severe, for example due to a circuit being fixed, moved, etc. by a telco; or if the errors are a real problem.
if this was the case, then the errors encountered would not be of much concern because when the telco work was completed, the errors would have ceased.
if you encounter errors sporadically during times of what you consider normal operation and no issues on the circuit or work on it have happened, then you would need to do your troubleshooting to find the problem and resolve it.
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