[CentOS] gigE -> 100Mb problems

[Ashish Yadav]

Hi,

On Tue, Oct 11, 2016 at 6:03 AM, John R Pierce <pierce at hogranch.com> wrote:

> I've got a pair of identical CentOS 6.7 servers, with SuperMicro X8DTE-F
> motherboards, these have 2 each Intel  82574L ethernet ports.  The eth0
> ports are plugged in with 10' runs of brand new cat 5e cable to a Cisco
> Nexxus 9000 switch (provided by the data center).
>
> These servers keep coming up at 100baseT rather than gigE. I've swapped
> ports and cables with a different server, that server gets gigE but these
> supermicro's are stuck at 100baseT regardless of the port or cableused.
>
> 'ethtool eth0'  says its gigE, but 'mii-tool -v eth0' says its 100baseT
> and doesn't even list gigE as an option, and the cisco switches see it as
> 100baseT too.
>
> anyone else run into anything like this before?
>
>
> This is quite strange but I need you check that if this is a problem with
the cisco switch or server NICs.

Please test that if both the server are communicating with each other at
1Gbps or not via "iperf" tool.

If above gives result of 1Gbps then it will eliminate the NICs problem then
you know that it is a problem with cisco switch only.

--Regards
Ashishkumar S. Yadav

>
>
> --
> john r pierce, recycling bits in santa cruz
>
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