Allied Telesis AT-S80 - Manual (Page 73)

AT-S80 Management Software User’s Guide
Section I: Using the Menus Interface 73
Without IGMP snooping, a switch needs to flood multicast packets from all
of its ports, except the port on which it received the packet. Such flooding
of packets can negatively impact network performance.
The AT-FS750 switches maintain a list of multicast groups through an
adjustable timeout value, which controls how frequently it expects to see
reports from end nodes that want to remain members of multicast groups,
and by processing leave requests.
Note
By default, IGMP snooping is disabled on the switch.