3560 - Intel Pro 1000 MT NIC connection problems

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Apr 7th, 2008
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Hi all,

our customer told me about his poor tranfer rate if he connect his Intel Pro 1000 MT NIC with latest driver software to a WS-C3560G-48TS (12.2(44)SE) at 1Gbps. The connection endpoints were set to auto. Allegedly the Intel Pro does not allow to hardcoded the speed/duplex to 1000 Full. If the speed was hardcoded to 100 Mbps at swtich side, than the transfer rate is OK. Does anyone notice this behaviour?


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andrew.butterworth Tue, 04/08/2008 - 01:31
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Do you have QoS enabled? I have some Dual Port Intel Pro/1000 MT NIC's in some servers and don't see any issues. You are correct that 1000/Full isn't an option with the drivers as this must be negotiated, however left at auto it will negotiate 1000/Full. This is due to the different behaviour of 1000BaseT over 10/100 Ethernet.



If you have QoS enabled it may be down to bug CSCsc96037. This can be resolved by changing the default queue-set threshold values.



uh.janssen Tue, 04/08/2008 - 14:29
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Hi Andy,

many thanks for your posted answer and helpful links.

QoS is not enabled at the moment. I am pleased to hear that the Intel Pro/1000 MT NICs works in general.


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