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known as the VLAN Group. A station can belong to more than one group. Stations in the same VLAN group can communicate with each other. With VLAN, a station cannot directly communicate with stations that are not in the same VLAN group(s); the traffic must first go through a router.
In GePON applications, VLAN is vital in providing isolation and security among subscribers. When properly configured, VLAN prevents one subscriber from accessing the network resources of another on the same LAN. Thus a user will not see the printers and hard disks of another user in the same building.
VLAN also increases network performance by limiting broadcasts to a smaller and more manageable logical broadcast domain. A VLAN group is a broadcast domain. In traditional
There are two VLAN implementations:
Therefore, if you wish to allow two subscriber ports to talk to each other, e.g., between conference rooms in a hotel, you must define the egress (outgoing port) for both ports. An egress port is an outgoing port, that is, a port through which a data packet leaves.
In the following figure, five hosts (A, B, C, D and E) are connected to a
Case 1:
Hosts A and B can communicate with each other, because they are in the same VLAN group. But Hosts A and B cannot communicate with Hosts C, D, and E.
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