Cisco 2950 Software Configuration Guide - Page 435
Disabling IGMP Report Suppression, Disabling IP Multicast-Source-Only Learning
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Chapter 21 Configuring IGMP Snooping and MVR Configuring IGMP Snooping Step 4 Step 5 Command show ip igmp snooping vlan vlan-id copy running-config startup-config Purpose Verify that Immediate Leave is enabled on the VLAN. (Optional) Save your entries in the configuration file. To disable IGMP Immediate-Leave on a VLAN, use the no ip igmp snooping vlan vlan-id immediate-leave global configuration command. This example shows how to enable IGMP immediate-leave processing on VLAN 130: Switch# configure terminal Switch(config)# ip igmp snooping vlan 130 immediate-leave Switch(config)# end 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: Step 1 Step 2 Step 3 Step 4 Step 5 Command configure terminal no ip igmp snooping report-suppression end show ip igmp snooping copy running-config startup-config 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. To re-enable IGMP report suppression, use the ip igmp snooping report-suppression global configuration command. Disabling IP Multicast-Source-Only Learning The IP multicast-source-only learning method is enabled by default. The switch learns the IP multicast group from the IP multicast data stream and only forwards traffic to the multicast router ports. If IP multicast-source-only learning is disabled by using the no ip igmp snooping source-only-learning global configuration command, the switch floods unknown multicast traffic to the VLAN and sends the traffic to the CPU until the traffic becomes known. When the switch receives an IGMP report from a host for a particular multicast group, the switch forwards traffic from this multicast group only to the multicast router ports. To disable multicast router discovery by PIMv2 packets, you should also enter the no ip igmp snooping mrouter learn pim v2 global configuration command. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 21-11
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