Cisco 2950 Software Configuration Guide - Page 449
Setting the Maximum Number of IGMP Groups, Configuring the IGMP Throttling Action
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Chapter 21 Configuring IGMP Snooping and MVR Configuring IGMP Filtering and Throttling Setting the Maximum Number of IGMP Groups You can set the maximum number of IGMP groups that a Layer 2 interface can join by using the ip igmp max-groups interface configuration command. Use the no form of this command to set the maximum back to the default, which is no limit. You can use this command on an logical EtherChannel interface but cannot use it on ports that belong to an EtherChannel port group. Beginning in privileged EXEC mode, follow these steps to set the maximum number of IGMP groups in the forwarding table: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Command configure terminal interface interface-id ip igmp max-groups number end show running-configuration interface interface-id copy running-config startup-config Purpose Enter global configuration mode. Enter interface configuration mode by entering the physical interface to configure. The interface can be a Layer 2 port that does not belong to an EtherChannel group or a EtherChannel interface. Set the maximum number of IGMP groups that the interface can join. The range is from 0 to 4294967294. The default is to have no maximum set. Return to privileged EXEC mode. Verify the configuration. (Optional) Save your entries in the configuration file. To remove the maximum group limitation and return to the default of no maximum, use the no ip igmp max-groups interface configuration command. This example shows how to limit to 25 the number of IGMP groups that an interface can join. Switch(config)# interface fastethernet0/2 Switch(config-if)# ip igmp max-groups 25 Switch(config-if)# end Configuring the IGMP Throttling Action After you set the maximum number of IGMP groups that a Layer 2 interface can join, you can configure an interface to remove a randomly selected multicast entry in the forwarding table and to add the next IGMP group to it by using the ip igmp max-groups action replace interface configuration command. Use the no form of this command to return to the default, which is to drop the IGMP join report. Follow these guidelines when configuring the IGMP throttling action: • You can use this command on a logical EtherChannel interface but cannot use it on ports that belong to an EtherChannel port group. • When the maximum group limitation is set to the default (no maximum), entering the ip igmp max-groups action {deny | replace} command has no effect. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 21-25
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