User Manual
5. Multicast service configuration
45
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5.
MULTICAST SERVICE CONFIGURATION
Multicast is the form of communication from point to multi-point where the source sends
information to a subset of all nodes in the network. The core of multicast technology is to make
the
message
replication
work
as
far
as
possible
from
the
nearest
recipient
to
reduce
the multicast data
traffic on the
network.
The controllable multicast, by identifying the user access or message request, the network
equipment will have the corresponding authority management to determine whether the applicant
have the appropriate permission to watch the program, thus to have the multi-cast service
controlling and forwarding in the access equipment. OLT can help provide
IPTV
services
for
carriers
with
unicast
and
multicast.
With
the
introduction
of
controllable
multicast, the multicast users will be
able to be managed and controlled on the network equipment, which can meet the requirements of
broadband video services provided by operators, and enable
multicast
services
to
be
"operational
and
manageable".
OLT
supports
IGMP
messages, V1, V2, V3 versions, and V1 versions of MLD
messages, where IGMP V4 supports partial functionality of type1-4 when the run version is
v3.
OLT supports two working modes, snooping and proxy. In Snooping mode, OLT listens only to the
protocol message, extracts the key information, and establishes two-layer transfer table.
In
proxy
mode,
OLT
will
be
used
as
a
node
and
send
query
messages
to
the
user
side
as a
proxy
of
network
equipment,
at
the
same
time,
the
multicast
message
flow
can
be
reduced as it shields the user
joining/leaving
messages.
The two-layer multicast transfer table set up by OLT consists of MVLAN, GROUP, INTERFACE and so
on. The downlink multicast stream transfer the multicast data stream to the corresponding PON port
according to the multicast transfer table
Содержание QSW-9010
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Страница 23: ...User Manual 2 Basic service configuration 23 www qtech ru...
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