Ip Igmp Snooping Report-Suppression - Cisco Catalyst 3650 series Command Reference Manual

ip igmp snooping report-suppression

To enable Internet Group Management Protocol (IGMP) report suppression, use the ip igmp snooping
report-suppression global configuration command on the device stack or on a standalone device. To disable
IGMP report suppression and to forward all IGMP reports to multicast routers, use 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.
Command Default
IGMP report suppression is enabled.
Command Modes
Global configuration
Command History
Release
Cisco IOS XE 3.3SE
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 device uses IGMP report suppression to forward only one IGMP report per multicast router query to
multicast devices. When IGMP report suppression is enabled (the default), the device sends the first IGMP
report from all hosts for a group to all the multicast routers. The device 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 device forwards
only the first IGMPv1 or IGMPv2 report from all hosts for a group to all of the multicast routers. If the
multicast router query also includes requests for IGMPv3 reports, the device 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 of the multicast routers.
Examples
This example shows how to disable report suppression:
Device(config)# no ip igmp snooping report-suppression
You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Modification
This command was introduced.
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
ip igmp snooping report-suppression
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