User Manual UMN:CLIV8102501IGMP Snooping TCN DebugTo enable debugging of all IGMP snooping TCN, use the following command.Command Mode Descriptiondebug igmp snooping tcnEnableEnables IGMP snooping Topology Change Notification(TCN) debugging.no debug igmp snooping tcn Disables IGMP snooping Topology Change Notification(TCN) debugging.