Disabling Igmp Report Suppression; Displaying Igmp Snooping Information - Cisco Catalyst 2960 Software Configuration Manual
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Displaying IGMP Snooping Information
Disabling IGMP Report Suppression
IGMP report suppression is supported only when the multicast query has IGMPv1 and IGMPv2 reports.
Note
This feature is not supported when the query includes IGMPv3 reports.
IGMP report suppression is enabled by default. When it is enabled, the switch forwards only one IGMP
report per multicast router query. When report suppression is disabled, all IGMP reports are forwarded
to the multicast routers.
Beginning in privileged EXEC mode, follow these steps to disable IGMP report suppression:
Command
Step 1
configure terminal
Step 2
no ip igmp snooping report-suppression
Step 3
end
Step 4
show ip igmp snooping
Step 5
copy running-config startup-config
To re-enable IGMP report suppression, use the ip igmp snooping report-suppression global
configuration command.
Displaying IGMP Snooping Information
You can display IGMP snooping information for dynamically learned and statically configured router
ports and VLAN interfaces. You can also display MAC address multicast entries for a VLAN configured
for IGMP snooping.
To display IGMP snooping information, use one or more of the privileged EXEC commands in
Table
Table 21-4
Commands for Displaying IGMP Snooping Information
Command
show ip igmp snooping [vlan vlan-id]
show ip igmp snooping groups [count |dynamic
[count] | user [count]]
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
21-16
21-4.
Purpose
Display the snooping configuration information for all VLANs on the
switch or for a specified VLAN.
(Optional) Enter vlan vlan-id to display information for a single VLAN.
The VLAN ID range is 1 to 1001 and 1006 to 4094.
Display multicast table information for the switch or about a specific
parameter:
•
•
•
Purpose
Enter global configuration mode.
Disable IGMP report suppression.
Return to privileged EXEC mode.
Verify that IGMP report suppression is disabled.
(Optional) Save your entries in the configuration file.
count—Display the total number of entries for the specified
command options instead of the actual entries.
dynamic—Display entries learned through IGMP snooping.
user—Display only the user-configured multicast entries.
Chapter 21
Configuring IGMP Snooping and MVR
OL-26520-01
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