Re: Switches and Multicast doubt

On Wed, Sep 28, 2011 at 08:47, Joe Astorino <joeastorino1982_at_gmail.com> wrote:
>
> Additionally, Multicast at an L2 Ethernet level is defined by the range
> 01:00:5e:00:00:00 - 01:00:5e:7f:ff:ff. B IANA owns the 24-bit OUI 01:00:5e.
> The 25th MSB is always 0, and that leaves 23 bits for actual multicasting

This is true only for IP multicast. For example, CDP is also
multicast, but not IP multicast. As an example, CDP frames are sent to
01:00:0c:cc:cc:cc. These are not IP multicasts, but are multicast
frames.

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