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XS712T Smart Switch
Auto-Video
Use this screen to configure the Auto-Video parameters.
To configure Auto-Video:
1. Select Sw
itching Multicast Auto-Video.
2. Select one of the following radio buttons:
• Select the Disab
le radio button to globally disable Auto-Video administrative mode for
the switch.
• Select the En
able radio button to globally enable Auto-Video administrative mode for
the switch.
The Auto-Video VLAN field shows the number of Au
to-configured IGMP snooping
VLANs.
3. Click Apply.
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 can be separated into different network segments to prevent
pla
cing 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 inte
nded 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
filter packets addressed to unrequested group addresses, they are unable to transmit new
packets onto the shared media for the period of time that the multicast packet is flooded. The