Virtual Internet Backbone for Multica
st IP.
IP-Multicast i
s the
class-D addre
ssing
scheme in
IP implemented by
steve Deering at
Xerox PARC. It wa
s adopted at the
IETF March 1992 meeting and acquired the name MBONE after the July 1992 IETF meeting. IP Multica
st-ba
sed routing allow
s di
stributed application
s to achieve
real-time communication over
IP {wide area network}
s through a lightweight, highly {thread}ed model of communication. Each network-provider participant in the MBONE provide
s one or more IP multica
st router
s to connect with tunnel
s to other participant
s and to cu
stomer
s. The multica
st router
s are typically
separate from a network'
s production router
s since mo
st production router
s don' t yet
support IP multica
st. Mo
st
site
s u
se work
station
s running the mrouted program, but the experimental MO
sPF
software for Proteon router
s i
s an alternative. It i
s be
st if the work
station
s can be dedicated to the multica
st routing function to avoid interference from other activitie
s and
so there will be no qualm
s about in
stalling kernel patche
s or new code relea
se
s on
short notice.
since mo
st MBONE node
s other than endpoint
s will have at lea
st three tunnel
s, and each tunnel carrie
s a
separate (unica
st) copy of each packet, it i
s al
so u
seful, though not required, to have multiple network interface
s on the work
station
so it can be in
stalled parallel to the unica
st router for tho
se
site
s with configuration
s like thi
s: +----------+ | Backbone | | Node | +----------+ | ------------------------------------------ External DMZ Ethernet | | +----------+ +----------+ | Router | | mrouted | +----------+ +----------+ | | ------------------------------------------ Internal DMZ Ethernet Thi
s configuration allow
s the mrouted machine to connect with tunnel
s to other regional network
s over the external
DMZ and the phy
sical backbone network, and connect with tunnel
s to the lower-level mrouted machine
s over the internal
DMZ, thereby
splitting the load of the replicated packet
s. The mrouted machine would not do any unica
st forwarding. Note that end-u
ser
site
s may participate with a
s little a
s one work
station that run
s the packet audio and video
software and ha
s a tunnel to a network-provider node.
RFC 1112 give
s the detail
s.
FAQ . (1994-11-11)
style="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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