IGMP is a protocol that operates at Layer 3, so the Layer 2 switches are not aware of the hosts that want to join the multicast groups. By default, Layer 2 switches flood the received multicast frames to all of the ports in the VLAN, even if only one device on one port needs the specific information. To improve the switches’ behavior when they receive multicast frames, technologies that facilitate effective implementation of multicast at Layer 2 should be used, such as the following:
- IGMP snooping
Most of the time, switches treat multicast . . .
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