Cisco 220 Series Smart Plus Administration Manual page 165

Multicast Forwarding
Configuring IGMP Snooping
STEP 1
STEP 2
STEP 3
STEP 4
Cisco 220 Series Smart Plus Switches Administration Guide Release 1.0.0.x
The IGMP Snooping Querier is used to support a Layer 2 Multicast domain of
snooping switches in the absence of a Multicast router. For example, where
Multicast content is provided by a local server, but the router (if one exists) on that
network does not support Multicast.
There should be only one IGMP querier in a Layer 2 multicast domain. The switch
supports standards-based IGMP querier election when more than one IGMP
querier is present in the domain.
To configure general IGMP Snooping parameters and enable IGMP Snooping on a
VLAN:
Click Multicast > IGMP Snooping.
Enter the following IGMP Snooping general parameters:
• IGMP Snooping Version—Select either IGMPv2 or IGMPv3.
• Report Suppression—Check Enable to enable IGMP Snooping report
suppression, or uncheck to disable this feature and forward all IGMP reports
to multicast routers.
IGMP report suppression is supported only when the Multicast query
NOTE
has IGMPv1 and IGMPv2 reports. This feature is not supported when the
query includes IGMPv3 reports.
The switch uses IGMP report suppression to forward only one IGMP report
per Multicast router query to Multicast devices. When IGMP router
suppression is enabled, the switch sends the first IGMP report from all hosts
for a group to all the Multicast routers. The switch does not send the
remaining IGMP reports for the group to the Multicast routers. This feature
prevents duplicate reports from being sent to the Multicast devices.
If the Multicast router query includes requests only for IGMPv1 and IGMPv2
reports, the switch forwards only the first IGMPv1 or IGMPv2 report from all
hosts for a group to all the Multicast routers. If the Multicast router query also
includes requests for IGMPv3 reports, the switch forwards all IGMPv1,
IGMPv2, and IGMPv3 reports for a group to the Multicast devices.
Select a VLAN, and click Edit.
Enter the following information:
• VLAN ID—Select the VLAN ID where IGMP Snooping is defined.
• IGMP Snooping Status—Enable or disable the monitoring of network traffic
to determine which hosts have asked to be sent Multicast traffic.
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