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IGMP Snooping Commands
ip igmp snooping unknown-multicast action
ip igmp snooping unknown-multicast action
Cisco 220 Series Smart Plus Switches Command Line Interface Reference Guide Release 1.0.0.x
Default Configuration
IGMP Snooping report suppression is enabled by default.
Command Mode
Global Configuration mode
User Guidelines
IGMP Snooping 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 Snooping 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 you disable IGMP report suppression by entering the no ip igmp snooping
report-suppression command, all IGMP reports are forwarded to the multicast
routers.
Example
switchxxxxxx(config)# ip igmp snooping report-suppression
To set the action when the switch receives an unknown multicast packet, use the
ip igmp snooping unknown-multicast action Global Configuration mode command.
To revert to its default setting, use the no form of this command.
Syntax
ip igmp snooping unknown-multicast action {drop | flood | router-port}
no ip igmp snooping unknown-multicast action
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