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N
P
ETWORK
LANNING
can be used for small networks attached to a single switch. However,
tagged VLANs should be used for larger networks, and all the VLANs
assigned to the inter-switch links.
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 are connected to four end users and a server
in a normal VLAN configuration. The remaining ports are configured into
a private VLAN.
Note: When connecting to a switch that does not support IEEE 802.1Q
VLAN tags, use untagged ports.
2-4
Ports 1-5 in VLAN 2
VDSL Switch
Fiber Optic Link to ISP
ISP
(Internet)
Figure 2-3 Making VLAN Connections
Ports 6-12 in a Private VLAN
Phone Lines to Central Office
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