With multicasting, one staton "speaks" and any number can listen, if they know which address ("group") to listen in on.
If you wanted to distribute video (~3Mbps stream), for example, if each station connected as a unicast, and you had 100 stations participating, you'd need (at least) 300Mbps of bandwidth from that video server.
No big deal, just toss in a Gig link to the server, right?
Well, what if 50 of those stations were on a single LAN segment? or on the other side of of a 6Mbps Multi-Link Frame Relay WAN connection?
With multicasting, you'd only use the 3Mbps(plus a little overhead). The transmitting device assigns / is assigned a specific multicast address (a group) ... and all the other interested devices just listen for that group. One talks, everyone else listens.... much more efficient.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.