Re: IP layer and layer 2 IGMP Snooping
- From: Albert Manfredi <bert22306@xxxxxxxxxxx>
- Date: Wed, 11 Jun 2008 08:12:52 -0700 (PDT)
On Jun 11, 2:50 am, vicky <vikrant.pan...@xxxxxxxxx> wrote:
As u written that there may be some ambiguty when (Multicast)IP to
Mac resolution
Is this ambiguity is
for example there are two multicast ip addresses
224.1.1.3 - 01-00-5e-01-01-03
225.1.1.3 - 01-00-5e-01-01-03
these represent 2 different multicast group.
Now when it resoluted to ip-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 and 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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- IP layer and layer 2 IGMP Snooping
- From: vicky
- Re: IP layer and layer 2 IGMP Snooping
- From: Albert Manfredi
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