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10-111
Expert Features
MAC Layer
10
Illegal MAC Source Address
Counter
Illegal MAC Source Address is a counter of all illegal MAC station source
addresses over a period of time per segment. A count of all illegal MAC source
addresses displays in the
Overview
counters of Expert View. A threshold for this
counter can be set in Expert Alarms.
Expert Symptom
Illegal MAC source addresses are automatically logged as expert symptoms. The
Symptom Summary
field provides the illegal address encountered. For example:
Addr=[FFFFFF:FFFFFF]
This symptom can help catch malfunctioning NICs or bad addresses generated due
to collisions. Illegal MAC source addresses may be discovered on Ethernet or
Token Ring networks.
Diagnostic Details
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Problem Description:
A broadcast Ethernet (or Token Ring) address has appeared as a source address.
This is a problem associated with a bad adapter card.
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Probable Cause(s):
1. Someone is transmitting illegal frames using a traffic generator.
2. There may be a faulty adapter card.
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Recommended Action(s):
1. Filter on the Network address to determine which host has the faulty card and
replace it.