Ip Igmp Snooping Report-Suppression - Cisco Catalyst 2960 Command Reference Manual
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Chapter 2
Catalyst 2960 Switch Cisco IOS Commands
ip igmp snooping report-suppression
Use the ip igmp snooping report-suppression global configuration command 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.
Syntax Description
This command has no arguments or keywords.
Defaults
IGMP report suppression is enabled.
Command Modes
Global configuration
Command History
Release
12.2(25)FX
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.
78-16882-01
ip igmp snooping report-suppression
no ip igmp snooping report-suppression
Modification
This command was introduced.
ip igmp snooping report-suppression
Catalyst 2960 Switch Command Reference
2-119
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