Configuring Igmp Snooping And Query - SMC Networks 8028L2 - annexe 1 Management Manual

| Configuring the Switch
C 4
HAPTER
IGMP Snooping
C IGMP
ONFIGURING
S Q
NOOPING AND UERY
ports containing hosts requesting to join the service and sends data out to
those ports only. It then propagates the service request up to any
neighboring multicast switch/router to ensure that it will continue to
receive the multicast service.
The purpose of IP multicast filtering is to optimize a switched network's
performance, so multicast packets will only be forwarded to those ports
containing multicast group hosts or multicast routers/switches, instead of
flooding traffic to all ports in the subnet (VLAN).
You can configure the switch to forward multicast traffic intelligently. Based
on the IGMP query and report messages, the switch forwards traffic only to
the ports that request multicast traffic. This prevents the switch from
broadcasting the traffic to all ports and possibly disrupting network
performance.
If multicast routing is not supported on other switches in your network, you
can use IGMP Snooping and IGMP Query to monitor IGMP service requests
passing between multicast clients and servers, and dynamically configure
the switch ports which need to forward multicast traffic.
Multicast routers use information from IGMP snooping and query reports,
along with a multicast routing protocol such as DVMRP or PIM, to support
IP multicasting across the Internet.
P
ARAMETERS
The following parameters are displayed on the IGMP Snooping
Configuration page:
Global Configuration
Snooping Enabled - When enabled, the switch will monitor network
◆
traffic to determine which hosts want to receive multicast traffic.
(Default: Enabled)
This switch can passively snoop on IGMP Query and Report packets
transferred between IP multicast routers/switches and IP multicast host
groups to identify the IP multicast group members. It simply monitors
the IGMP packets passing through it, picks out the group registration
information, and configures the multicast filters accordingly.
◆ Unregistered IPMC Flooding Enabled - Floods unregistered
multicast traffic into the attached VLAN. (Default: Disabled)
Once the table used to store multicast entries for IGMP snooping is
filled, no new entries are learned. If no router port is configured in the
attached VLAN, and Unregistered IPMC Flooding is disabled, any
subsequent multicast traffic not found in the table is dropped,
otherwise it is flooded throughout the VLAN.
Leave Proxy Enabled - Suppresses leave messages unless received
◆
from the last member port in the group. (Default: Disabled)
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