Multicast Protocol; Ip Multicast Overview - 3Com 7700 Configuration Manual

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IP Multicast Overview

M
ULTICAST
This chapter includes information on the following:
IP Multicast Overview
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GMRP
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IGMP Snooping
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Common Multicast Configuration
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IGMP Configuration
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PIM-DM Configuration
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PIM-SM Configuration
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Many transmission methods can be used when the destination (including data,
voice and video) is the secondary use of the network. You should establish an
independent data transmission path for each user if the multicast method is used.
Or the broadcast mode can be used if you intend to send the information to all
users on the network. In either case, the end users will receive the information. For
example, if the same information is required by 200 users on the network, the
traditional solution is to send the information 200 times respectively in unicast
mode. In the broadcast mode, the data is broadcast over the entire network. Both
of the methods waste bandwidth resources. In addition, the broadcast mode
cannot ensure information security.
IP multicast technology solves the problem. The multicast source sends the
information only once. Multicast routing protocols establish tree-type routing for
multicast packets. The information being sent will be replicated and distributed at
as far as possible (see Figure 1). Therefore, the information can be correctly
sentwith high efficiency to each user.
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ROTOCOL