nvtanswers - Does the NV-EC1701 support multicasting?
Reset Search



Does the NV-EC1701 support multicasting?

« Go Back


First, an IGMP querier must exist on the network. The NV-EC1701 supports multicasting, however it also deliberately blocks unknown traffic and allows only those multicast communications listed on a report provided by the querier. To prevent traffic congestion, we do not want all multicast streams on a LAN delivered to all destinations. We want them delivered only to destinations that request the stream. The NV-EC1701 does so by using IGMP snooping and/or multicast broadcasts to determine when to pass a particular multicast stream. Typically, the camera generates more than one stream. Multicast streams are usually used for high-bandwidth communication to the VMS for recording. Unicast streams at slower data rates are usually used for live browser-based monitoring. The software driver in the VMS system generates a broadcast request destined for the camera. Routers and the NV-EC1701 deliver the requests to the camera. But they also learn (and add to their aging tables) the fact that the VMS system is a valid multicast destination. Multicast packets from the camera are then routed to the VMS destination. A simple browser that does not make this request will not see any multicast streams. The same browser will successfully see a unicast stream. NVT Phybridge does have the capability to route all multicast traffic everywhere. This would require custom configuration at the factory, and is not recommended.



Was this article helpful?



Please tell us how we can make this article more useful.

Characters Remaining: 255