107
GS752TP, GS728TP, and GS728TPP Gigabit Smart Switches
To configure Auto-Video:
1. Select Switching Multicast Auto-Video Configuration.
The following screen displays:
2. Globally enable or disable the Auto-Video administrative mode for the switch by selecting
Enable or Disable next to the Auto-Video Status radio button.
The Auto-Video VLAN field shows the number of auto-configured IGMP snooping
VLANs.
3. Click APPLY to send the updated configuration to the switch.
Configuration changes take place immediately.
IGMP Snooping Internet Group Management Protocol (IGMP) snooping is a feature that allows a switch to
forward Multicast traffic intelligently on the switch. Multicast IP traffic is traffic that is destined
to a host group. Class D IP addresses identify host groups, which range from 224.0.0.0 to
239.255.255.255. Based on the IGMP query and report messages, the switch forwards traffic
only to the ports that request the multicast traffic. This action prevents the switch from
broadcasting the traffic to all ports and possibly affecting network performance.
A traditional ethernet network can be separated into different network segments to prevent
placing too many devices onto the same shared media. Bridges and switches connect these
segments. When a packet with a broadcast or Multicast destination address is received, the
switch forwards a copy into each of the remaining network segments in accordance with the
IEEE MAC Bridge standard. Eventually, the packet is made accessible to all nodes
connected to the network.
This approach works well for broadcast packets that are intended to be seen or processed by
all connected nodes. In the case of multicast packets, however, this approach could lead to
less efficient use of network bandwidth, particularly when the packet is intended for only a