User’s Manual of GT-915A
■ VLAN Classification
When the switch receives a frame, it classifies the frame in one of two ways. If the frame is untagged, the switch assigns
the frame to an associated VLAN (based on the default VLAN ID of the receiving port). But if the frame is tagged, the switch
uses the tagged VLAN ID to identify the port broadcast domain of the frame.
■ Port Overlapping
Port overlapping can be used to allow access to commonly shared network resources among different VLAN groups, such
as file servers or printers. Note that if you implement VLANs which do not overlap, but still need to communicate, you can
connect them by enabled routing on this switch.
■ Untagged VLANs
Untagged (or static) VLANs are typically used to reduce broadcast traffic and to increase security. A group of network users
assigned to a VLAN form a broadcast domain that is separate from other VLANs configured on the switch. Packets are
forwarded only between ports that are designated for the same VLAN. Untagged VLANs can be used to manually isolate
user groups or subnets.
4.3.4.3 VLAN Mode
The VLAN Mode Page provide VLAN Mode configuration supported by the Managed Media Converter as the VLAN Mode
screen in Figure 4-42 appears.
Figure 4-42: VLAN Mode Configuration Page Screenshot
The Page includes the following fields:
Object Description
• VLAN Mode
Display the current VLAN mode used by this Managed Media Converter.
Tag VLAN determines the VID of each entry and those ports are VLAN
members of which VLAN based on the settings of the Tag-based Entry.
Group VLAN determines which port in each group is its VLAN member
based on the settings of the Group-based Entry.
• Tag Method
This option only available in Tag VLAN mode.
By Tag- whether packet sent out add/remove tag is judged on the basis of
the value set by the port in the Tag-based entry.
By Port-whether the port sent out the packet add/remove tag is judged by
the tagging value set by the port in the VLAN port config web page
• Egress Frame
It could connect the selected packet type via engress rule to transport between
different VLAN groups. The available options are shown below:
Unicast
ARP
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