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  • MAC of a sitch port

    Hi,
    I want to understand how do MAC addresses assigned to Cisco switch port.
    There is a base switch MAC address and there are MAC addresses that are assigned in the incrementing order to the ports of switch. Upon what standard is this assignment performed.
    Thanks a lot!

  • #2
    Re: MAC of a sitch port

    Only managed devices have MAC addresses, unmanaged devices do not as they are transparent to the network.

    What do you mean by "what standard is this performed"?

    As you have said, the port MAC addresses are incremental by Hex of the base MAC address.
    Infrastructure Architect
    CCNA, CCNA Security, MCSE, JNCIS

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    • #3
      Re: MAC of a sitch port

      Thank you for the answer! I simply didn't find enough information on the web. Only in one forum, somebody mentioned that MACs are assigned in the incrementing order. Is it always so? Each next device that is connected receives MAC address of the previously connected device +1 to the last hexadecimal digit?

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      • #4
        Re: MAC of a sitch port

        On managed devices the switch ports do have MAC addresses which are incremental from the base MAC but you will never see them. If you need to find out what they are then you can either work it out or use the required applications.

        Any device which connects to the switch will have its own MAC address which is hard encoded onto the interface by the manufacturer. As soon as the device send a frame then the switch will capture the MAC address of the device and input it into the MAC address table. The device does not receive the MAC of the switch port.

        If you do a "show mac-address table" then none of the swithport MACs will be detailed, only the MAC addresses of the connected hosts will be listed.
        Infrastructure Architect
        CCNA, CCNA Security, MCSE, JNCIS

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