Cisco 2950G 24 Software Configuration Guide - Page 400
Catalyst 2950 Desktop Switch Software Configuration Guide,
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Configuring IGMP Snooping Chapter 17 Configuring IGMP Snooping and MVR If you disable IP multicast-source-only learning with the 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. Note We strongly recommend that you do not disable IP multicast-source-only learning. You should disable IP multicast-source-only learning only if your network is not composed of IP multicast-source-only networks and if disabling this learning method improves the network performance. Beginning in privileged EXEC mode, follow these steps to disable IP multicast-source-only learning: Step 1 Step 2 Step 3 Step 4 Step 5 Command configure terminal no ip igmp snooping source-only-learning end show running-config | include source-only-learning copy running-config startup-config Purpose Enter global configuration mode Disable IP multicast-source-only learning. Return to privileged EXEC mode. Verify that IP multicast-source-only learning is disabled. (Optional) Save your entries in the configuration file. To enable IP multicast-source-only learning, use the ip igmp snooping source-only-learning global configuration command. This example shows how to disable IP multicast-source-only learning and to verify the configuration: Switch# configure terminal Switch(config)# no ip igmp snooping source-only-learning Switch(config)# end Switch# show running-config | include source-only-learning Current configuration : 1972 bytes ! version 12.1 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname Switch ! enable password my_password ! ip subnet-zero no ip igmp snooping source-only-learning ! ! spanning-tree extend system-id no spanning-tree vlan 1 ! ! interface FastEthernet0/1 no ip address ! 17-10 Catalyst 2950 Desktop Switch Software Configuration Guide 78-14982-01
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