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Multicast Filtering
For multicast filtering, the ES8508 uses IGMP (Internet Group Management Protocol) Snooping technology.
IGMP 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 computer's 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 in the
following table.
Messages
Query
Report
Leave Group
You can enable IGMP Snooping and IGMP Query functions. This section illustrates the information of the
IGMP Snooping function, including different multicast groups' VID and member ports, and IP multicast
addresses that range from 224.0.0.0 to 239.255.255.255.
The following web pages are included in this group:
•
IGMP Snooping
on Page 104
•
IGMP Query
on Page 105
•
Unknown Multicast
•
GMRP Configuration
Optionally, you can use the CLI for configuration, see
RocketLinx ES8508 Series User Guide: 2000575 Rev. A
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.
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.
A message sent by a host to the querier to indicate that the host has
quit as a member of a specific multicast group.
on Page 105
on Page 106
Configuration Using the Web Interface
Multicast Filtering (CLI)
on Page 174.
Multicast Filtering - 103
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