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Accton Technology VM2548 User Manual Page 29

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Sample Applications
2-3
Making VLAN Connections
VLANs can be based on port groups, or each data frame can be explicitly tagged to
identify the VLAN group to which it belongs. When using port-based VLANs, ports
can be assigned to one or more groups. Port-based VLANs are suitable for small
networks. A single switch can be easily configured to support several VLAN groups
for various organizational entities (such as Finance and Marketing).
When VLANs cross switches linked by Ethernet connections, you must use VLAN
tagging. This allows you to assign multiple VLAN groups to the “trunk” ports (that is,
tagged ports) connecting different switches.
This switch also has a Private VLAN feature. This allows modification of the default
VLAN to provide port-based security and isolation between ports within the VLAN.
Data traffic on these ports can only be forwarded to, and from, the uplink port.
Private VLANs and normal VLANs can exist simultaneously within the same switch.
In the figure below, ports 1-5, connected to four end users and a server, are
configured into a normal VLAN. The remaining ports are configured into a private
VLAN.
Figure 2-3. Making VLAN Connections
Note: When connecting to a switch that does not support IEEE 802.1Q VLAN tags, use
untagged ports.
Ports 1-5 in VLAN 2
VDSL Switch-VS2512A
VDSL Splitter-VM2524
ISP
(Internet)
Central Office
(PSTN)
Fiber Optic Link to ISP
Ports 6-24 in a Private VLAN
Phone Lines to Central Office
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VDSLSplitter
-
VM2524
VM2524
VDSLSwitch
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