Multicast Service - Zte FSAP 9800 Technical Manual

FSAP 9800 Technical Manual
SVLAN
Overview
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tions in the basic VLAN. One MVLAN can have multiple multi-
cast source ports and one source port can belong to multiple
MVLANs.
� Multicast receiver port
A multicast receiver port authorizes a user port with the qual-
ification of asking for multicast service. If the user port is not
the receiver port of one MVLAN, all the multicast requests from
the port are refused. In addition, the receiver port can be used
for cascade. Therefore, the MVLAN enables the DSLAM to sup-
port two services:
The multicast service can be directly forwarded to the
�
DSLAM.
The DSLAM dynamically requests multicast service from the
�
uplink multicast device.
SVLAN has two application modes:
�
VLAN stacking
VLAN stacking meets the user demands of VLAN expansion and
dedicated line batch service. The dedicated line batch service
indicates that multiple ISPs probably exit in a layer-2 switching
MAN. The subscriber uses the outer-layer VLAN of VLAN stack-
ing to identify the ISP which the subscriber belongs to.
The system assigns an inner-layer tag (Customer VLAN) to the
port that can implement the stacking service to identify the
subscriber. Then, it tags the outer-layer VLAN (SP VLAN) to the
port. On the network, the service is forwarded based on the
outer-layer VLAN, which is removed when the service reaches
to the BAS device. At the BAS device, the system identifies
the subscriber based on the inner-layer tag. VLAN stacking is
used to locate the port.
� Q-in-Q VLAN
Q-in-Q VLAN implements the directly transparent transmission
of the VLAN service to the peer end. The principle of the Q-in-Q
VLAN is that FSAP 9800 receives the VLAN tagged packet from
the lower-layer network and assigns VLAN ID of the public net-
work to the packet, and then forwards it to the upper-layer
network. The packet is transmitted through the backbone net-
work of the MAN. When the packet reaches to the other side of
the backbone network, the VLAN tag of the public network is
removed and the packet is recovered to the subscriber packet.
Then, the packet is forwarded to the user-side device.
The packet transmitted in the backbone network has two
802.1q tags: the public network tag and the private network
tag. In this way, the private VLAN is transparently forwarded
to the peer end directly. The VLAN ID resource of the public
network is greatly saved.

Multicast Service

Multicast refers to point-to-multipoint communication in the net-
work. The multicast technology implements the point-to-multi-
point data transmission in the network effectively. The key point