Netgear GS752TXS Technical Information download pdf (Page 125)

Chapter 4: Configuring Switching Information | 125

GS752TXS Smart Switch Software Administration Manual

To configure Auto-Video:

1. Globally enable or disable the Auto-Video administrative mode for the switch by

selecting the Auto-Video Status radio button.

The Auto-Video VLAN field show the number of Auto-configured IGMP snooping

VLANs.

2. Click Cancel to cancel the configuration on the screen and resets the data on the screen to

the latest value of the switch.

3. Click Apply t

o send the updated configuration to the switch. Configuration changes take

effect 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. Host groups are identified by class D IP addresses, 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 prevents the switch

from broadcasting the traffic to all ports and possibly affecting network performance.

A traditional Ethernet network may 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 will forward 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

small number of nodes. Packets will be flooded into network segments where no node has

any interest in receiving the packet. While nodes will rarely incur any processing overhead to

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Netgear GS752TXS Technical Information Page 125