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Posted by Albert Manfredi on June 11, 2008, 11:12 am
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> As u written that there may be some ambiguty =A0when (Multicast)IP to
> Mac resolution
> Is this ambiguity is
> for example there are two multicast ip addresses
>
> 224.1.1.3 =A0- =A0 01-00-5e-01-01-03
> 225.1.1.3 =A0- =A0 01-00-5e-01-01-03
>
> these represent 2 different multicast group.
>
> Now when it resoluted to =A0ip-mac for multicast table entry in l 2
> switch as well as to come at DA of multicast packet.
>
> then
> how a switch can able to differentiate the two multicast ranges
> (224.1.1.3 =A0and =A0 225.1.1.3 )
If the L2 switch uses the MAC multicast DA to decide which ports to
forward the frame to, then it cannot differentiate between those two
IP multicast groups. So the L2 switch sends frames from both of those
IP multicast groups to all hosts that have joined one or the other (or
both).
It is then the responsibility of the IP stack of the hosts to filter
the incoming UDP/IP packets, based on the IP Class D address.
Bert
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