I have a Switch Core 6509-E in my network , my Supplier developed a system that work with Multicast IP 220.127.116.11 however I cant see this packet arriveing in my Sniffer in the same VLAN without any config span. I'm Know that the Switch do flood ip multicast by default in all port in the same VLAN. I would like know if is there some information inside the packet/system that may cause this problem ?? or is there a command in Switch that i must use ?