I am trying to do video video conferencing on my two location. I heard about multicast application and how it reduces bandwith. Please advice me on a very good multicast application supported by cisco routers and switches.
As Giuseppe points out the routers and switches need to be configured to handle multicast traffic. But the application for it is something that would run on the server that originates the videoconference and on the client that receives the videoconference.
Multicasting only "saves bandwidth" if you are replicating identical data to a group of destinations. For instance a retailer might wish to distribute video accross their network to their stores for advertising in store. Rather than each store opening a unicast connection, requireing that the server duplicate the video data into each session and the network carry multiple copies of the same data, the server multicasts the video and the network is responsible for replicating the multicast packets to any registered sources. So the only data duplication occurs at branches in the multicast tree, and even then on ly one copy goes out of each destination link.
The same idea is used in distributing software to workstations, for instance.
It can help in video conferencing where there are more than two participants, but unless you regularly VC with say half a dozen or more endpoints the complexity of setting it up may not be worth it.
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