Chapter 4: Web Configuration
forward the multicast traffic to all hosts on all interfaces and consequently block and interrupt the traffic of USB and wireless users, shown as the following figure.
When IGMP snooping is invoked, it makes the system aware to establish the best path for multicast service to save LAN bandwidth. Refer the figure below, just as desired, only host A and D will actually receive multicast traffic when IGMP snooping is enabled.
While IGMP snooping is enabled, the IGMP packets will be monitored, the membership information will be recorded and processed, and the multicast traffic will only be forwarded to those LAN interfaces, such as Ethernet, Wireless, and USB, which are bonded to the subscribed multicast groups. Thus it helps to save the bandwidth and helps the devices to perform more effectively.
Check Enable IGMP Snooping and click Apply to invoke this function.
When IGMP Snooping is enabled, you can check the box below to filter out multicast packets which will be sent to your local network if no user plays multimedia movies.
If the PVC you’re using is NAT enabled, remember to turn on the IGMP Proxy at the same time. Please refer to Internet – IGMP Proxy for more information.
Note that the IGMP proxy must be enabled first. If the IGMP Snooping function is not available as shown in the following figure, you have to enable the IGMP Proxy first.
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