LevelOne GEL-5261, User Manual, Page: 437 / 570

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Multicast Filtering
This chapter describes how to configure the following multicast services:
◆ IGMP Snooping – Configures snooping and query parameters.
◆ Filtering and Throttling – Filters specified multicast service, or throttles the
maximum of multicast groups allowed on an interface.
◆
MLD Snooping – Configures snooping and query parameters for IPv6.
◆ MLD Filtering and Throttling – Filters specified multicast service, or throttles the
maximum of multicast groups allowed on an interface.
◆ Filtering MLD Query Packets on an Interface – Configures the interface to drop
MLD query packets.
Overview
Multicasting is used to support real-time applications such as video conferencing
or streaming audio. A multicast server does not have to establish a separate
connection with each client. It merely broadcasts its service to the network, and
any hosts that want to receive the multicast register with their local multicast
switch/router. Although this approach reduces the network overhead required by a
multicast server, the broadcast traffic must be carefully pruned at every multicast
switch/router it passes through to ensure that traffic is only passed on to the hosts
which subscribed to this service.
Figure 279: Multicast Filtering Concept
Unicast
Flow