Web Management Guide

Table Of Contents
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13
Multicast Filtering
This chapter describes how to configure the following multicast services:
IGMP Snooping – Configures snooping and query parameters for IPv4.
Filtering and Throttling – Filters specified multicast service, or throttles the
maximum of multicast groups allowed on an interface for IPv4.
MLD Snooping – Configures snooping and query parameters for IPv6.
Layer 3 IGMP – Configures IGMP query used with multicast routing.
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 270: Multicast Filtering Concept
This switch can use Internet Group Management Protocol (IGMP) to filter multicast
traffic. IGMP Snooping can be used to passively monitor or “snoop on exchanges
between attached hosts and an IGMP-enabled device, most commonly a multicast
Unicast
Flow
Multicast
Flow