Cisco 2950 Software Configuration Guide - Page 437
Displaying IGMP Snooping Information
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Chapter 21 Configuring IGMP Snooping and MVR Displaying IGMP Snooping Information To disable the aging of the forwarding table entries, enter the ip igmp snooping source-only-learning age-timer 0 global configuration command. If you disable source-only learning by using the no ip igmp snooping source-only learning global configuration command and the aging time is enabled, it has no effect on the switch. Displaying IGMP Snooping Information You can display IGMP snooping information for dynamically learned and statically configured router ports and VLAN interfaces. You can also display MAC address multicast entries for a VLAN configured for IGMP snooping. To display IGMP snooping information, use one or more of the privileged EXEC commands in Table 21-4. Table 21-4 Commands for Displaying IGMP Snooping Information Command show ip igmp snooping [vlan vlan-id] show ip igmp snooping group [vlan vlan-id] show ip igmp snooping mrouter [vlan vlan-id] Purpose Display the snooping configuration information for all VLANs on the switch or for a specified VLAN. (Optional) Enter vlan vlan-id to display information for a single VLAN. Display information about the IGMP multicast groups, the compatibility mode, and the ports that are associated with each group. (Optional) Enter vlan vlan-id to display information for a single VLAN. Display information on dynamically learned and manually configured multicast router interfaces. Note When you enable IGMP snooping, the switch automatically learns the interface to which a multicast router is connected. These are dynamically learned interfaces. (Optional) Enter vlan vlan-id to display information for a single VLAN. show ip igmp snooping querier [vlan vlad-id] Display information about the IGMP version that an interface supports. (Optional) Enter vlan vlan-id to display information for a single VLAN. show mac address-table multicast [vlan vlan-id] Display the Layer 2 MAC address table entries for a VLAN. The [user | igmp-snooping] [count] keywords are all optional and limit the display as shown: • vlan vlan-id-Displays only the specified multicast group VLAN. • user-Displays only the user-configured multicast entries. • igmp-snooping-Displays only entries learned through IGMP snooping. • count-Displays only the total number of entries for the selected criteria, not the actual entries. For more information about the keywords and options in these commands, refer to the command reference for this release. For examples of output from the commands in Table 21-4, refer to the command reference for this release. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 21-13
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