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Each VLAN is a broadcast domain and hosts in VLAN can communicate just like in the same LAN. But it can
not interconnect between VLAN. Then broadcast message is limited in the VLAN.
Port based VLAN
A port based VLAN determines the membership of a data frame by examining the configuration of the port
that receive the transmission or reading a portion of the data frame's tag header. A four--byte field in the
header is used to identify the VLAN. This VLAN identification indicates what VLAN the frame belongs to. If the
frame has no tag header, the switch checks the VLAN setting of the port that receive the frame. If the switch
has been configured for port based VLAN support, it assigns the port's VLAN identification to the new frame.
1. AddItem
Group name can be any valid characteristic in port based VLAN. The same group name means you need to
modify the members of the group. A new group name means the new transmission rule is built. The
transmission item is not more than 32 in port based VLAN.
2. Delete Item
It refers to delete the existing transmission items. The example above shows that all ports are in the same
VLAN. Each port can intercommunicate with others. We can modify the default configuration to add VLAN
item. The ports in the group can intercommunicate with each other, but the port outside the group cannot
intercommunication with the port inside.
IEEE 802.1Q VLAN
Main function of IEEE 802.1Q VLAN is the VLAN tag. The tag including VLAN information can insert in the
Ethernet frame. The device transmits the data according its transmission rules. VLAN tag protocol in the data
frame is 2 byte, the number is 0x8100.
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Configuring the System
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