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each of the other ports. Each VLAN contains two ports, the uplink port and one of the other ports in
the switch, so the uplink port can communicate with any other port but other ports cannot
communicate with each other.
2. Port Based VLAN
VLANs are divided based on ports. By default, the Port Based VLAN is enabled.
3. 802.1Q VLAN
The IEEE 802.1Q protocol defines a new format of the frame; it adds a Tag header in the original
Ethernet frame, as follows:
Figure 5-2 IEEE 802.1Q frame
VLAN tags in the packets are necessary for the switch to identify packets of different VLANs. The
switch works at the data link layer in OSI model and it can identify the data link layer encapsulation
of the packet only, so you can add the VLAN tag field into the data link layer encapsulation for
identification.
IEEE 802.1Q Tag VLAN is divided by VLAN ID (VID). On receiving a frame, the switch checks the
VID in the Tag header of the frame to decide which VLAN it belongs to. If the receiving frame
doesn’t contain the Tag header, the switch will assign a Tag to the frame, using the PVID of the
port as its VID.
In this User Guide, the tagged packet refers to the packet with VLAN tag whereas the untagged
packet refers to the packet without VLAN tag.
The VLAN module is mainly for VLAN configuration, including four submenus: MTU VLAN, Port
Based VLAN, 802.1Q VLAN and 802.1Q PVID Setting.
5.1 MTU VLAN
On this page you can choose to enable MTU VLAN mode and configure VLANs.
Choose the menu VLANMTU VLAN to load the following page.
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