2nd NIC speed throttled to 10/100Mbit

[ktemplar]

Hi,

i've got a problem with my 2 ESX-Servers. Both systems have got a Dualport-Gigabit-NIC (Broadcom NetXtreme II BCM5708 rev 12). On each system is one Interface (vmnic0) in a slow speed (100Mbit) detected. On the switchports the interfaces identifies even as 10Mbit speed.

One month ago, both interfaces are normal as 1Gigabit detected. I can't find any "failed" messages about these problems in the logs.

If I set the speed values on fixed 1Gigabit Full Duplex on ESX and Switch, the ESX disabled these NIC-Interface completely.

Can anyone help me?

Many thanks.

[masaki · Accepted solution]

Check on the switch for packet loss, errors, etc.

Try changing network cables.

Are you sure nothing has changed on network topology?

[bggb29]

Have you tried setting both sides to auto , just to see what they negotiate at.

Whose switch cisco, dell ?

[christianZ]

and in addition the cable check/replace.

[ktemplar]

Thanks to all.

Yes it was a broken cable on both server.

I changed them to fully functional cables and now it works fine!

[masaki]

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