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Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Chapter 2 Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
ip igmp snooping report-suppression
ip igmp snooping report-suppression
To enable Internet Group Management Protocol (IGMP) report suppression, use the ip igmp snooping
report-suppression command in global configuration mode. To disable IGMP report suppression and
to forward all IGMP reports to multicast routers, u se the no form of this command.
ip igmp snooping report-suppression
no ip igmp snooping report-suppression
Syntax Description This command has no arguments or keywords.
Defaults IGMP report suppression is enabled.
Command Modes Global configuration
Command History
Usage Guidelines 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 router suppression is enabled (the default), 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.
If you disable IGMP report suppression by entering the no ip igmp snooping report-suppression
command, all IGMP reports are forwarded to all the multicast routers.
You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Examples This example shows how to disable report suppression:
Switch(config)# no ip igmp snooping report-suppression
Release Modification
12.2(52)EY This command was introduced.
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