ELTEX LTP-4X, Operation Manual

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Fig. 25.1 – "VLAN for Subscriber" Service Model Architecture
"VLAN for Service" Architecture
The S-VLAN model has a separate VLAN for every service. Consider its operation on an example
of an abstract S-VLAN 100 service.
S-VLAN 100 is used between the OLT and service routers that is global for all subscribers in
terms of this service. When a service request is generated upstream, records are added to the MAC
table in the OLT according to S-VLAN and subscriber's MAC address. In case of downstream traffic,
a corresponding subscriber of the service is determined based on the MAC table.
If the destination address of the downstream transmission is unknown (broadcast or unknown
unicast), i. e. the GEM port cannot be determined, two options are available:
—
transmission through a dedicated broadcast GEM port (traffic is transmitted to all
subscribers);
—
transmission to every subscriber through a GEM port corresponding to the service.
The destination address, in case it is unknown (broadcast or unknown unicast), will be
determined based on the method implemented in a definite service model.