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IP multicast
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Baron_Saturday
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Baron_Saturday
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Thu Dec 14 2000 at 2:50:53
Traditionally, there have been two ways of deliveirng IP data -
Unicast
and
Broadcast
. However neither of these is ideal for
broadband
multimedia
. Using unicast you have to broadcast the data stream once to each user (so if 10 users connect to a server running at 400
kbps
you need 4000kbps of
bandwidth
total). This works fine for low bandwidth applications like
audio streaming
but places too much of a drain for greater data rate -
MPEG2
streaming video can easily use 3.5Mbps. Using broadcast you have to broadcast the data to everyone, even if they do not want the data (So if 10 users out of 1000 want a 400kbps stream all 1000 users end up receiving a 400kbs stream)
The solution to this is muticasting - the server sends out a single data stream, and the
routers
duplicate the data only to
subnets
that actually want to receive it - so if 10 out of 1000 users want to receive a 400kbps stream, the server only needs 400kbps of outgoing bandwidth, and this 400kbps stream will only be sent to subnets where at least one person wants the data.
Informing the routers which subnets want the data is done by using a multicast routing protocol such as
DVMRP
,
MOSPF
or
PIM
See also:
IP Unicast
,
IP Broadcast
printable version
chaos
IP Broadcast
DVMRP
Tab completion is an infectious brain virus
224.0.0.0
MOSPF
MBONE
multicasting
kbs
PIM
How to find out your own IP address
IP Unicast
Marble Madness
Sap
NetBIOS over TCP/IP
TCP/IP Reference Model
multicast
ipfwadm
DOD Networking Model
ICMP
broadcast
IP address
MAC broadcast
Internet
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