Multicast Forwarding
Configuring IGMP Snooping
Cisco 220 Series Smart Switches Administration Guide Release 1.1.0.x 170
14
To configure general IGMP Snooping parameters and enable IGMP Snooping on a
VLAN:
STEP 1 Click Multicast > IGMP Snooping.
STEP 2 Enter the following information:
• IGMP Snooping Version—Select either IGMPv2 or IGMPv3.
• Report Suppression—Enable or disable IGMP report suppression.
Disabling this feature will forward all IGMP reports to Multicast routers.
NOTE IGMP report suppression is supported only when the Multicast query
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 report
suppression is enabled, the switch sends the first IGMP report from all hosts
for a group to all 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.
The switch always forwards only the first IGMPv1 or IGMPv2 report from all
hosts for a group to all Multicast routers, regardless of the Multicast router
query also includes requests for IGMPv3 reports.
STEP 3 Select a VLAN, and click Edit.
STEP 4 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.
• MRouter Ports Auto Learn—Enable or disable auto learning of the ports to
which the Mrouter is connected.
• Query Robustness—Enter the robustness variable value to be used if this
switch is the elected querier.
• Query Interval—Enter the interval between the general queries to be used
if this switch is the elected querier.
• Query Max Response Interval—Enter the delay used to calculate the
maximum response code inserted into the periodic general queries.
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