Internet Group Membership Protocol Snooping (IGMP Snooping) is aprotocol that operates on switches that allows them to dynamicallylearn about multicast traffic. IGMP Snooping, an industry standard,does what it implies: it snoops all traffic listening for IGMPpackets. Once it sees an IGMP packet, it dynamically learns whatMAC address the traffic is destined for, and what MAC address thetraffic comes from. Once the switch knows the MAC address, it canlook up in its table on what port to send the traffic to.