Virtual Lans; Vlan Configuration Example - D-Link DES-3226L User Manual

Virtual LANs

Adding Virtual LAN (VLAN) support to a Layer 2 switch offers some of the benefits of both
bridging and routing. Like a bridge, a VLAN switch forwards traffic based on the Layer 2
header, which is fast, and like a router, it partitions the network into logical segments, which
provides better administration, security and management of multicast traffic.
A VLAN is a set of end stations and the switch ports that connect them. You may have many
reasons for the logical division, such as department or project membership. The only physical
requirement is that the end station and the port to which it is connected both belong to the
same VLAN.
Each VLAN in a network has an associated VLAN ID, which appears in the IEEE 802.1Q tag
in the Layer 2 header of packets transmitted on a VLAN. An end station may omit the tag, or
the VLAN portion of the tag, in which case the first switch port to receive the packet may
either reject it or insert a tag using its default VLAN ID. A given port may handle traffic for
more than one VLAN, but it can only support one default VLAN ID.
The Private Edge VLAN feature lets you set protection between ports located on the switch.
This means that a protected port cannot forward traffic to another protected port on the same
switch.
The feature does not provide protection between ports located on different switches.

VLAN Configuration Example

The diagram in this section shows a switch with four ports configured to handle the traffic for
two VLANs. Port 0/2 handles traffic for both VLANs, while port 0/1 is a member of VLAN 2
only, and ports 0/3 and 0/4 are members of VLAN 3 only. The script following the diagram
shows the commands you would use to configure the switch as shown in the diagram.
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