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IP multicast is a bandwidth-conserving technology that reduces traffic by simultaneously delivering a single stream of information to potentially thousands of corporate recipients and homes. Please refer to Beau Williamson's book titled Developing IP Multicast Networks, Volume 1 (Cisco Press, 1999) if you need more information about any of the topics presented in this overview. It is assumed that the reader is familiar with TCP/IP, Border Gateway Protocol (BGP), and networking in general. This document is intended as a general "refresher" on IP multicast, not a tutorial. Finally, interdomain protocols are covered, such as Multiprotocol Border Gateway Protocol (MBGP), Multicast Source Directory Protocol (MSDP), and Source Specific Multicast (SSM). Then intradomain multicast protocols are reviewed, such as Internet Group Management Protocol (IGMP), Cisco Group Management Protocol (CGMP), Protocol Independent Multicast (PIM) and Pragmatic General Multicast (PGM). First, general topics such as multicast group concept, IP multicast addresses, and Layer 2 multicast addresses are discussed. This overview provides a brief, summary overview of IP Multicast. IP multicast provides a third possibility: allowing a host to send packets to a subset of all hosts as a group transmission. Traditional IP communication allows a host to send packets to a single host (unicast transmission) or to all hosts (broadcast transmission). Multicast Source Discovery Protocol (MSDP)Īll sections were updated and new sections were added.Īll sections were updated, new sections were added, and some sections were removed. Multiprotocol Border Gateway Protocol (MBGP) Router-Port Group Management Protocol (RGMP) Multicast in the Layer 2 Switching Environment
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Internet Group Management Protocol (IGMP) IP Multicast Technology Overview Table Of Contents