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15 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 throttling
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.
◆ Multicast VLAN Registration for IPv4 – Configures a single network-wide
multicast VLAN shared by hosts residing in other standard or private
VLAN groups, preserving security and data isolation.
◆ Multicast VLAN Registration for IPv6 – Configures a single network-wide
multicast VLAN shared by hosts residing in other standard or private
VLAN groups, preserving security and data isolation.
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.