I stand corrected. You have to use the rightmost 23 bits not all 24.
See ElephantChild's response..
""D. J. Jones"" <[EMAIL PROTECTED]> wrote in message
8vn06a$lms$[EMAIL PROTECTED]">news:8vn06a$lms$[EMAIL PROTECTED]...
> I think the correct mapping should be:
>
> 224.163.163.45 = 01-00-5E-A3-A3-2D
>
> Here is a great URL at 3com by Chuck Semeria and Tom Maufer
>
> http://www.3com.com/nsc/501303.html
>
> I think this will give you a good idea of how to map (not convert) a 32
bit
> class D
> multicast address to a 48 bit ethernet address.
>
> Hope this helps..dj
>
> ""Patrick A. Morin"" <[EMAIL PROTECTED]> wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > He's talking about multicast IP to multicast MAC translation. Notice the
> > MAC address starting with 01
> >
> > Patrick
> >
> > > Sisqo wrote:
> > > >
> > > > Cisco press book (BCMSN) does not really explain well the concept.
I
> was
> > > > wondering if someone can help me break the barrier.
> > > >
> > > > Example in the book:
> > > >
> > > > 224.163.163.45 = 01-00-5E-23-A3-2D
> > > >
> > > > I thought 163=A3, why is the 2nd octet converted to 23?
> > > >
> > >
> > > There is no corelation between MAC address and IP address,
> > > save for the association you make when you assign an IP to
> > > an interface.
> > >
> > > _________________________________
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