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User’s Guide
Physical Errors
Counter
The Physical Errors counter increments when a change in the number of total MAC
physical errors per second exceeds a threshold. Physical errors include CRC/
alignment errors, dropped events, collisions, jabbers, oversize packets, undersize
packets, and fragments. A count of all instances where the threshold is reached
displays in the Overview counters of Expert View.
Expert Symptom
Physical Error events are automatically logged as expert symptoms. The
Symptom
Summary field provides information about the rate of change for total MAC
physical errors. For example:
Rate of change of Errors=450
The threshold value for this symptom can be changed. The default threshold is a
delta of 400 physical error packets per second.
Diagnostic Details
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Problem Description:
The error threshold has been exceeded for this segment, resulting in a MAC
Physical Errors symptom.
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Probable Cause(s):
1. The network is overloaded.
2. A faulty hub/switch/router device.
3. A hub may have been incorrectly used.
Ex:, an uplink port may have been used as a data port.
4. An end station may have a faulty network interface card.
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Recommended Action(s):
1. Restart the capture after setting up a filter to capture error packets only.
2. Based on the capture, isolate the device that is in error and fix the problem.