The multicast routers in turn will forward those multicast packets to all of the multicast receivers that are registered to that multicast address. The routing devices' job is to sit between the sources and receivers to determine the correct logical network topology for routing from the unicast and multicast points of view so they can correctly route the traffic.įor example, if you have a video server acting as a multicast source that is broadcasting a live video feed, that stream of traffic can be sent only once by the server in a single stream of packets to a particular multicast address. With multicast, only the destinations that explicitly indicated that they want to receive the multicast traffic receive the messages sent. This type of communication is present in videoconferencing or online gaming applications. Multicast: The packet is sent to a set (group) of hosts that can be on different networks ( one to many)Īs a side note, there is also the idea of many-to-many communication, where there are multiple sources for the same destination or where a source is also a destination.Broadcast: The packet is sent to an entire network ( one to all).Unicast: The packet is sent to a single destination ( one to one). There are three different methods to deliver IP packets: It finishes with a configuration example using Cisco routers. This article will cover IP multicast concepts, starting from the basics and continuing on to discuss the different types of multicast forwarding path trees and multicast routing protocols.
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