Name: Cisco Catalyst 3750-X
Brand: Cisco
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Catalyst 3750-X and 3560-X Switch Command Reference

OL-29704-01

Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands

ip igmp snooping report-suppression

Use the ip igmp snooping report-suppression global configuration command on the switch stack or on

a standalone switch to enable Internet Group Management Protocol (IGMP) report suppression. Use the

no form of this command to disable IGMP report suppression and to forward all IGMP reports to

multicast routers.

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.

Examples This example shows how to disable report suppression:

Switch(config)# no ip igmp snooping report-suppression

You can verify your settings by entering the show ip igmp snooping privileged EXEC command.

Release Modification

12.2(53)SE2 This command was introduced.

Cisco Catalyst 3750-X Command Reference

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