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  • NIC port and Switch port speed mismatch

    Sometimes we may come across Speed, Duplex and Negotiation mismatch in server side as well as at the switch side.
    Speed and duplex should match between NIC port and at the switch port.

    How to check the Speed of your NIC:

    In Linux environment, you can check the Speed of your NIC using 'ethtool' command, this can easily be installed by the following ways.

    In Debian servers;
    # apt-get update
    # apt-get install ethtool

    In CentOS and RHEL;

    #yum update
    yum install ethtool


    Now we need to select the interface for which we need to check the Speed:


    #root@server] ethtool eth0

    Advertised auto-negotiation: Yes Speed: 100Mb/s Duplex: Full

    There you can see the Speed of the NIC is 100Mb/s and now it's the time to check the Speed set in the switch port.

    For checking the switch port speed, we need SSH access to the switch.

    Once you SSH to the Switch you can run the following command to find the Switch port speed.
    SW04# show interfaces status
    This command will show the Speed, Duplex and Negotiation assigned with each switch port and we need to make sure there is no mismatch in between these values at the NIC and switch port.

    The interoperability may occur due to speed mismatch or duplex mismatch and hence the connection won't establish.
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