Specifications

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
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Chapter 2 Cisco IOS Commands
ip igmp snooping source-only-learning
ip igmp snooping source-only-learning
Use the ip igmp snooping source-only-learning global configuration command to enable IP
multicast-source-only learning on the switch. Use the no form of this command to disable IP
multicast-source-only learning.
ip igmp snooping source-only-learning
no ip igmp snooping source-only-learning
Syntax Description This command has no arguments or keywords.
Defaults IP multicast-source-only learning is enabled.
Command Modes Global configuration
Command History
Usage Guidelines When IP multicast-source-only learning is enabled, the switch learns the IP multicast group from the IP
multicast data stream and only forwards traffic to the multicast router ports.
Note We strongly recommend that you do not disable IP multicast-source-only learning. IP
multicast-source-only learning should be disabled only if your network is not composed of IP
multicast-source-only networks and if disabling this learning method improves the network
performance.
Examples This example shows how to disable source-only learning:
Switch(config)# no ip igmp snooping source-only-learning
This example shows how to enable source-only learning:
Switch(config)# ip igmp snooping source-only-learning
You can verify your settings by entering the show running-config | include source-only-learning
privileged EXEC command.
Release Modification
12.1(11)EA1 This command was first introduced.