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eth0 is running at 100Mb/s instead of 1000Mb/s while using NIC teaming

Troubleshooting


Problem

Running "show network interface speed" on an appliance shows eth0 is running at 100Mb/s rather than 1000Mb/s. Attempts to set it back to 1000Mb/s using "store network interface speed eth0 1000" do not persist.

Symptom

Run the following as user cli to see if eth0 is running at 1Gb/s or 100Mb/s

show network interface speed


* It should show this if it is at 1Gbs:

      eth0:   1000    100

* And this if it is at 100Mbs:
      eth0:   100    1000

After running the following, the eth0 remains at 100Mb/s

     store network interface speed eth0 1000

Cause

When NIC teaming is used you cannot modify the eth settings while they are teamed.

Environment

The network environment is suitable for 100Mb/s operation

NIC teaming is enabled

Resolving The Problem

NIC teaming must be disabled before the speed is changed:


    Perform the following as user cli

    1. Disable NIC teaming
        store network interface high-availability off

    2. Wait for the system to restart

    3 Reset eth0 to 1Gbs

        store network interface speed eth0 1000

    4. Check that the change has been made
        show network interface speed

    5. Re-team the NICs
        store network interface high-availability on

    6. Wait for system to restart

    7. Make sure the change has persisted after re-teaming

        show network interface speed

    8. If it is still showing "eth0:   1000    100" then the changes have been saved correctly.

If you try the above a couple of times with no success then please contact IBM Technical Support for further assistance

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Document Information

Modified date:
16 June 2018

UID

swg21642653

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