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[EFM] (EFM)a question about P2P

Hi, Dolors:

thanks for your september presentation, I am very interested about it. I think whether the P2P layer be put above the 
MAC layer or under the MAC layer is a very important question.
I think if we put the P2P layer about the MAC layer then using filter layer to emulate P2P between different ONU,
this can solve the problem that without PTP layer different OUN can't communicate each other in layer 2, 
but there is a question that we know downstream in PON is broadcasting nature, the ONU how to deal with the ethernet frame with unknown destination addr if the destination addr is an addr in another ONU range.
traditional ethernet switch will forward the frame to all the other ports(because the destinaton addr is unknown), I think in EPON if we solve the problem like that is not suitable for the security problem, we must filter these packet out.
where we can filter these packet out, I think under the MAC layer is more suitable,
so I prefer put the P2P layer under the MAC layer.

best regards

                   xu zhang
                   bu. tele. tech. Co, Ltd
                   Email: zhangx@xxxxxxxx