H3C s3100-52P Operation Manual

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Contents

Operation Manual – MulticastH3C S3100-52P Ethernet Switch Chapter 1 Multicast Overview1-5z A router that supports Layer 3 multicast is called multicast router or Layer 3multicast device. In addition to providing multicast routing, a multicast router canalso manage multicast group members.For a better understanding of the multicast concept, you can assimilate multicasttransmission to the transmission of TV programs, as shown in Table 1-1.Table 1-1 An analogy between TV transmission and multicast transmissionStep TV transmission Multicast transmission1A TV station transmits a TVprogram through a televisionchannel.A multicast source sends multicastdata to a multicast group.2 A user tunes the TV set to thechannel. A receiver joins the multicast group.3The user starts to watch the TVprogram transmitted by the TVstation via the channel.The receiver starts to receive themulticast data that the source sendsto the multicast group.4 The user turns off the TV set. The receiver leaves the multicastgroup.Note:z A multicast source does not necessarily belong to a multicast group. Namely, amulticast source is not necessarily a multicast data receiver.z A multicast source can send data to multiple multicast groups at the same time, andmultiple multicast sources can send data to the same multicast group at the sametime.1.1.5 Advantages and Applications of MulticastI. Advantages of multicastAdvantages of multicast include:z Enhanced efficiency: Multicast decreases network traffic and reduces server loadand CPU load.z Optimal performance: Multicast reduces redundant traffic.z Distributive application: Multicast makes multiple-point application possible.II. Application of multicastThe multicast technology effectively addresses the issue of point-to-multipoint datatransmission. By enabling high-efficiency point-to-multipoint data transmission, over anIP network, multicast greatly saves network bandwidth and reduces network load.

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