Vlan Segmentation; Vlan And Trunk Groups; Configuring Static Vlans - D-Link DGS-3324SR User Manual

D-Link DGS-3324SR Layer 3 Stackable Gigabit Ethernet Switch
On port-based VLANs, NICs do not need to be able to identify 802.1Q tags in packet headers. NICs send and
receive normal Ethernet packets. If the packet's destination lies on the same segment, communications take place
using normal Ethernet protocols. Even though this is always the case, when the destination for a packet lies on
another switch port, VLAN considerations come into play to decide if the packet gets dropped by the switch or
delivered.

VLAN Segmentation

Take for example a packet that is transmitted by a machine on Port 1 that is a member of VLAN 2. If the
destination lies on another port (found through a normal forwarding table lookup), the switch then looks to see if
the other port (Port 10) is a member of VLAN 2 (and can therefore receive VLAN 2 packets). If Port 10 is not a
member of VLAN 2, then the packet will be dropped by the switch and will not reach its destination. If Port 10 is
a member of VLAN 2, the packet will go through. This selective forwarding feature based on VLAN criteria is
how VLANs segment networks. The key point being that Port 1 will only transmit on VLAN 2.
Network resources such as printers and servers however, can be shared across VLANs. This is achieved by
setting up overlapping VLANs. That is ports can belong to more than one VLAN group. For example, setting
VLAN 1 members to ports 1, 2, 3, and 4 and VLAN 2 members to ports 1, 5, 6, and 7. Port 1 belongs to two
VLAN groups. Ports 8, 9, and 10 are not configured to any VLAN group. This means ports 8, 9, and 10 are in the
same VLAN group.

VLAN and Trunk Groups

The members of a trunk group have the same VLAN setting. Any VLAN setting on the members of a trunk
group will apply to the other member ports.

Configuring Static VLANs

To create or modify an 802.1Q VLAN:
In the Configuration folder, open the VLAN folder and click the Static VLAN Entry link to open the following
window:
The 802.1Q Static VLANs menu lists all previously configured VLANs by VLAN ID and name. To delete an
existing 802.1Q VLAN, click the corresponding
To create a new 802.1Q VLAN, click the Add button in the Static VLANs menu. A new menu will appear, as
shown below, to configure the port settings and to assign a unique name and number to the new VLAN. See the
table below for a description of the parameters in the new menu.
Note: In order to use VLAN segmentation in conjunction with port trunk
groups, you can first set the port trunk group(s), and then you may
configure VLAN settings. If you wish to change the port trunk grouping
with VLANs already in place, you will not need to reconfigure the VLAN
settings after changing the port trunk group settings. VLAN settings will
automatically change in conjunction with the change of the port trunk
group settings.
Figure 4- 21. Current 802.1Q Static VLANs Entries window
button under the Delete heading.
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