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DGS-3200 Series Layer 2 Managed Gigabit Ethernet Switch Web UI Reference Guide
55
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.
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.
NOTE: In order to use VLAN segmentation in conjunction with port trunk groups, first set the
port trunk group(s), and then configure the VLAN settings. To change the port trunk grouping
with VLANs already in place it is unnecessary 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.
To view the following window, click L2 Features > VLAN > 802.1Q VLAN:
Figure 3 - 4. VLAN List tab of the 802.1Q VLAN window
The VLAN List tab lists all previously configured VLANs by VLAN ID and VLAN Name. To delete an existing 802.1Q VLAN,
click the corresponding Delete button.
To create a new 802.1Q VLAN or modify an existing 802.1Q VLAN, click the Add/Edit VLAN tab. A new tab 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 on the next
page for a description of the parameters in the new window.
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