RocketLinx WR7802-XT Series User Guide
: 2000638 Rev. A
Multicast Filtering Pages - 73
Configuration Using the Web User Interface
Multicast Filtering Pages
For multicast filtering, the WR7802-XT uses IGMP Snooping technology. IGMP (Internet Group Management
Protocol) is an Internet Protocol that provides a way for an 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:
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 subsection, Force filtering can determined whether the switch flooding unknown multicast or not.
Following web page are included in this group:
•
Multicast Filtering | IGMP Snooping Page
•
Multicast Filtering | IGMP Query Page
Multicast Filtering
Query
A message sent from the querier (an IGMP router or a switch) that 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 Group
A message sent by a host to the querier to indicate that the host has quit
as a member of a specific multicast group.
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