Digisol DG-GS4826S Management Manual page 423

16
O
VERVIEW
M
ULTICAST
This chapter describes how to configure the following multicast services:
Layer 2 IGMP – Configures snooping and query parameters.
u
Filtering and Throttling
u
the maximum of multicast groups allowed on an interface.
Layer 3 IGMP – Configures IGMP query used with multicast routing.
u
Multicast VLAN Registration (MVR)
u
multicast VLAN shared by hosts residing in other standard or private
VLAN groups, preserving security and data isolation.
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 240: Multicast Filtering Concept
– 423 –
F
ILTERING
– Filters specified multicast service, or throttling
– Configures a single network-wide
Unicast
Flow
Multicast
Flow