The switch updates its multicast forwarding table as a multicast router interface. If you enable IGMP snooping on a network device, it discovers the interfaces by looking at the IGMP traffic and when that port receives an IGMP query or Protocol Independent Multicast (PIM) updates. Group Member Interfaces – interfaces that are going to the hosts that are members of the multicast groups.Multicast Router Interfaces – these ports go to the multicast routers or IGMP queriers.How Does Internet Group Management Protocol Snooping Function?Ī network switch determines to forward multicast traffic with IGMP snooping enabled so that it maintains the information about the interfaces in its multicast forwarding table: Receivers that are not interested will recognize that the destination MAC address in the frame does not belong to them and discard the packet. If a MAC address is received but is not advertised on the MAC address table, it is treated as an unknown frame, and it will be then forwarded to all the ports on the same VLAN, excluding the port where the frame originated. Unicast traffic in Cisco switches discovers layer 2 MAC addresses and their corresponding physical ports by looking upon the Layer 2 MAC address source, which can be found in the MAC address table. IGMP snooping is a technique that network switches utilize to minimize flooding of IPv4 multicast traffic and optimize forwarding by sending multicast traffic only to receivers who are interested.
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