Example ............................................................................................................................................ 86

Preventing an All Groups entry for a port ............................................................................... 90

Controlling which addresses create All Groups entries ....................................................... 95

Statically specifying that a port is a router port ........................................................................... 101

Example .......................................................................................................................................... 101

IGMP debugging ................................................................................................................................... 103

Example .......................................................................................................................................... 103

Appendix: STP state ............................................................................................................................ 108

Switch 1 ........................................................................................................................ 108

Switch 2 .......................................................................................................................................... 109

Switch 3 .......................................................................................................................................... 110