Multicast - Raisecom ISCOM2600G-HI (A) Series Configuration Manual

Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
8

Multicast

This chapter describes basic principles and configuration procedures for multicast, and
provides related configuration examples, including the following sections:
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8.1 Multicast
With the continuous development of Internet, more and more interactive data, voice, and
video of various types emerge on the network. On the other hand, the emerging e-commerce,
online meetings, online auctions, video on demand, remote learning, and other services also
rise gradually. These services bring higher requirements on network bandwidth, information
security, and paid feature. Traditional unicast and broadcast cannot meet these requirements
well, while multicast has met them timely.
Multicast is a point-to-multipoint data transmission method. The method can effectively solve
the single point sending and multipoint receiving problems. During transmission of packets on
the network, multicast can save network resources and improve information security.
Comparison among unicast, broadcast, and multicast
Multicast is a kind of packets transmission method which is parallel with unicast and
broadcast.
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Multicast
Basic functions of Layer 2 multicast
IGMP Snooping
IGMP Querier
IGMP MVR
IGMP filtering
Multicast VLAN copy
MLD
Unicast: the system establishes a data transmission path for each user who needs the
information, and sends separate copy information about them. Through unicast, the
amount of information transmitted over the network is proportional to the number of
users, so when the number of users becomes huge, there will be more identical
information on the network. In this case, bandwidth will become a bottleneck, and
unicast will not be conducive to transmission of large-scale information.
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