Multicast Filtering - Korenix JetNet 6710G User Manual

4.9

Multicast Filtering

For multicast filtering, JetNet 6710G/6810G uses IGMP Snooping
technology. IGMP (Internet Group Management Protocol) is an Internet
Protocol that provides a way for internet device to report its multicast group
membership to adjacent routers. Multicasting allows one computer on the
internet to send data to a multitude of other computers that have identified
themselves as being interested in receiving the originating computers data.
Multicasting is useful for such applications as updating the address books
of mobile computer users in the field, sending out newsletters to a
distribution list, and broadcasting streaming media to an audience that has
tuned into the event by setting up multicast group membership.
In effect, IGMP Snooping manages multicast traffic by making use of
switches, routers, and hosts that support IGMP. Enabling IGMP Snooping
allows the ports to detect IGMP queries, report packets, and manage
multicast traffic through the switch. IGMP has three fundamental types of
messages, as shown below:
Message Description
Query A message sent from the querier (an IGMP router or a
switch) which asks for a response from each host that
belongs to the multicast group.
Report A message sent by a host to the querier to indicate that the
host wants to be or is a member of a given group indicated
in the report message.
Leave A message sent by a host to the querier to indicate that the
Group host has quit as a member of a specific multicast group.
You can enable IGMP Snooping and IGMP Query functions here. You will
see the information of the IGMP Snooping function in this section, including
different multicast groups' VID and member ports, and IP multicast
addresses that range from 224.0.0.0 to 239.255.255.255.
In this section, Force filtering can determined whether the switch flooding
unknown multicast or not.
Following commands are included in this group:
4.9.1 IGMP Snooping
4.9.2 IGMP Query
4.9.3 Force Filtering
4.9.4 CLI Commands of the Multicast Filtering
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