Sample Applications2-3Making 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 simultaneous ly 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.

Ports1-5 in VLAN 2
VDSLSwitch-VS2512A
VDSLSplitter-VM2524
ISP(Internet)
CentralOffice
(PSTN)
FiberOptic Link to ISP
Ports6-24 in a Private VLAN
PhoneLines to Central Office
LineVDSLSplitter-VM2524
VM2524
VDSLSwitch-VS2512A
Reset
Power
Stacking
Diag
Master
On
Off
Up
Down
Stacking
VS2512A
ExpansionModule
100-240V~50-60Hz1A
Console
2
3
4
5
6
7
8
9
10
11
12
VDSL
1
Activity
Link
Activity
Link/Speed
1
2
3
4
Ethernet
RXTX
VM2512A-1SX-SC-M
1000BASE-SXMultimodeModule