Cisco 2950G 24 Software Configuration Guide - Page 399
Enabling IGMP Immediate-Leave Processing, Disabling IP Multicast-Source-Only Learning
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Chapter 17 Configuring IGMP Snooping and MVR Configuring IGMP Snooping This example shows how to statically configure a host on an interface and verify the configuration: Switch# configure terminal Switch(config)# ip igmp snooping vlan 1 static 0100.5e00.0203 interface gigabitethernet0/1 Switch(config)# end Switch# show mac address-table multicast vlan 1 Vlan Mac Address Type Ports ---- ----- 1 0100.5e00.0203 USER Gi0/1 Enabling IGMP Immediate-Leave Processing When you enable IGMP Immediate-Leave processing, the switch immediately removes a port when it detects an IGMP version 2 leave message on that port. You should use the Immediate-Leave feature only when there is a single receiver present on every port in the VLAN. Immediate Leave is supported with only IGMP version 2 hosts. Beginning in privileged EXEC mode, follow these steps to enable IGMP Immediate-Leave processing: Step 1 Step 2 Step 3 Step 4 Step 5 Command configure terminal ip igmp snooping vlan vlan-id immediate-leave end show ip igmp snooping vlan vlan-id copy running-config startup-config Purpose Enter global configuration mode Enable IGMP Immediate-Leave processing on the VLAN interface. Return to privileged EXEC mode. 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 and verify the configuration: Switch# configure terminal Switch(config)# ip igmp snooping vlan 130 immediate-leave Switch(config)# end Switch# show ip igmp snooping vlan 130 vlan 130 ---------- IGMP snooping is globally enabled IGMP snooping is enabled on this Vlan IGMP snooping immediate-leave is enabled on this Vlan IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan IGMP snooping is running in IGMP_ONLY mode on this Vlan 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. 78-14982-01 Catalyst 2950 Desktop Switch Software Configuration Guide 17-9
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