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IP Multicasting Concepts

This lesson represents an entry point to IP multicast services, presents the functional model of IP multicasting, and gives an overview of technologies present in IP multicasting. The student will grasp the idea of IP multicasting, its benefits and associated caveats, and will determine various types of multicast applications. The student will gain an understanding of the IP multicast conceptual model and its implementation prerequisites. | 1 IP Multicasting Concepts Overview This lesson represents an entry point to IP multicast services presents the functional model of IP multicasting and gives an overview of technologies present in IP multicasting. The student will grasp the idea of IP multicasting its benefits and associated caveats and will determine various types of multicast applications. The student will gain an understanding of the IP multicast conceptual model and its implementation prerequisites. Objectives Upon completion of this chapter the student will be able to n Explain the benefits of multicasting and identify possible caveats n List various types of multicast applications and their requirements n Present the basic conceptual IP multicast model n Identify the addressing issues of IP multicasting n Explain the way multicast applications work and identify the prerequisites that have to be fulfilled for an implementation IP Multicast - Benefits and Caveats Objectives Upon completion of this section the student will be able to n Compare traditional unicast delivery to multicast data distribution n Explain the benefits of IP multicasting n Indicate possible problems associated with IP multicasting 1-2 IP Multicast Technology Copyright 2000 Cisco Systems Inc. Why Multicast Used when sending same data to multiple receivers Better bandwidth utilization Less host router processing Used when receivers addresses unknown Used when simultaneous delivery for a group of receivers is required simulcast 2000 Cisco Systems Inc. www.cisco.com IP multicasting concepts Page 5 Multicast may be used to send the same data packets to multiple receivers. By sending to multiple receivers the packets are not duplicated for every receiver but are sent in a single stream where downstream routers take care of packet multiplication over receiving links. Routers process fewer packets because they receive only a single copy of the packet. This packet is then multiplied and sent on outgoing interfaces where there are .