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Squidly
Asked: 2011-11-28 21:48:29 +0800 CST

NIC are not advertising Correct Speeds

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I have an IBM x336 that is not advertising the proper LINK speeds. One interface is the other is not. I've tried to Force it to 1000/Full but then it just shows link down. I have confirmed the switch is set to auto negotiate like my switches. I have also changed out my Ethernet Cables. I'm at a loss where to look further. I have verified that it will connect at 1G on a different swtich. This also has happened on two different servers on the same switch.

This is my output from mii-tool -v for each interface.

eth0: negotiated 100baseTx-FD, link ok
  product info: vendor 00:08:18, model 24 rev 0
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
  link partner: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
eth1: negotiated 1000baseT-FD flow-control, link ok
  product info: vendor 00:08:18, model 24 rev 0
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
  link partner: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

EDIT The Fix turned out to be a bad port on the switch.

nic network-speed

2 Answers

  1. Best Answer

    Have you tried changing ports on the switch for the problem connnection?

    Have you tried forcing BOTH sides to a single speed, forcing just the system side may not work you should try a force on both the port side as well as the interface side.

    Any information on the switch end concerning the problem port?

    Have you looked at ifconfig -a to see if there are Rx/Tx errors?

    Those are a few things that come to my mind off the top of my head.

    • 3

  2. You have two options: Set both speed and duplex mode to autonegotiation on the server and the switch. Make sure that neither speed or duplex mode is fixed on any side!

    OR

    Fix them both at 1G/FDX.

    Setting one of the two to autonegotiation and the other one to a fixed setting will not work, be it speed or duplex. You either get a very, very slow connection (DX mismatch) or none at all (speed mismatch).

    • 1