I have Catalyst 6009 switches and servers connected to them. Both should autonegotiate to 100Mbps fullduplex. But sometimes the switch detects "late-collsions" and err-disables the server-port. This happens mostly at high network load on the server (data saving while night).
CatOS 6.3(3) / RJ21-connectors, on different Intel Pro100+Server adapters (newest drivers)
My question: Does the autonegotiation happen once at the Joining of the server or in regular intervals (eg. every minute, hour)? Could there be a duplex-problem which only happens on high load - maybe servers forgets "fullduplex"???
Re: Problems with LateCollisions on AutoNeg-100FDX
We had problems with 3524XL switches getting collision fragments, alignment errors and late collisions from servers under high load. Changing from auto-negotiate to 100/full did not help. It was only after getting the vendor to re-write NIC drivers the problems were solved. Not an easy task.
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