IGMP/MLD snooping operation

Whenever a packet is received, the bridge initially determines whether it is a unicast, broadcast, or multicast packet. For broadcast and unicast packets, the bridge operates in the usual way, i.e. it floods to all ports or sends to a specific port based on the MAC table entry for the receiver.

Two types of IP multicast packet are differentiated (whereby packets which are truncated or contain an invalid checksum are dropped entirely):

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