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Standard multicast mac-address

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  • 30-07-2003 9:15am
    #1
    pookster
    Closed Accounts Posts: 113 ✭✭


    Does any know if there is a standard format for a multicast mac-address. I was under the impression that if the least significant was set to 1, then that was enough:-
    e.g. xxxxxxx1-xxxxxxxx-xx........... or 0160-01ee-0621 or something like that.

    But now while troubleshooting, a vendor is saying it has to begin with:-
    0100-5exx-xxxx

    Anyone have any experience with this?

    Cheers,
    Pookster.
    :confused:


Comments

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    #2
    iano
    Registered Users Posts: 197 ✭✭iano


    "An Ethernet multicast address consists of the multicast bit, the 23-bit vendor component, and the 24-bit group identifier assigned by the vendor.""the multicast bit is the low-order bit of the first byte".

    For details, see http://www.iana.org/assignments/ethernet-numbers

    Hope this helps,
    Ian.


  • Options
    #3
    pookster
    Closed Accounts Posts: 113 ✭✭pookster


    Cheers Ian


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