I had some trouble with the multicast (the scheme is in attachements). The trouble is that I can't ping group 220.127.116.11 on SW4 from another router. I found that multicast packets arrive to SW4 (I've watched with sniffer). And SW4 increase the counter of that packets. I can see it with the command 'sh ip mroute count'. But ICMP Echo Reply don't send. And multicast traffic can't be found on SW4 with 'debug ip mpacket'. The switch is 3750.
Could you please explain what I've done wrong?