Configuring The Igmp Leave Timer; Disabling Igmp Report Suppression - Cisco Catalyst 2950 Software Configuration Manual

Configuring IGMP Snooping

Configuring the IGMP Leave Timer

Beginning in privileged EXEC mode, follow these steps to enable the IGMP configurable-leave timer:
Command
Step 1 configure terminal
Step 2 ip igmp snooping
last-member-query-interval time
Step 3
ip igmp snooping vlan vlan-id
last-member-query-interval time
Step 4
end
Step 5 show ip igmp snooping
Step 6 copy running-config startup-config
Use the no ip igmp snooping last-member-query-interval global configuration command to globally
reset the IGMP leave timer to the default setting (1000 milliseconds).
Use the no ip igmp snooping vlan vlan-id last-member-query-interval global configuration command
to remove the configured IGMP leave-time setting from the specified VLAN.

Disabling IGMP Report Suppression

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.
Note 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.
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.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
20-12
Purpose
Enter global configuration mode.
Configure the IGMP leave timer globally. The range is from 100 to
5000 milliseconds.
(Optional) Configure the IGMP leave time on the VLAN interface. The
range is from 100 to 5000 milliseconds.
Note Configuring the leave time on a VLAN overrides the globally
configured timer.
Return to privileged EXEC mode.
(Optional) Display the configured IGMP leave time.
(Optional) Save your entries in the configuration file.
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.
Chapter 20 Configuring IGMP Snooping and MVR
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