
Industrial Managed
Ethernet Switch
User Manual
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2.13.2 802
.
1Q VLAN
Tagging
-
based (802
.
1Q) VLAN
is the networking standard that supports virtual LAN (VLANs) on an Ethernet
network
.
The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures
for bridges and switches in handling such frames
.
The standard also contains provisions for a quality of service
prioritization scheme commonly known as IEEE 802
.
1Q
.
VLAN tagging frames are frames with 802
.1Q (VLAN) tags that specify a valid VLAN identifier (VID). Whereas,
untagged frames are frames without tags or frames that carry 802
.1p (prioritization) tags and only having
prioritization information and a VID of 0
. When a switch receives a tagged frame, it extracts the VID and forwards
the frame to other ports in the same VLAN
.
For a 802
.
1Q VLAN packet, it adds a tag (32
-
bit field) to the original packet. The tag is between the source MAC
address and the EtherType/length fields of the original frame. For the tag, the first 16 bits is the Tag protocol
identifier (TPID) field which set to a value of 0x8100 in order to identify the frame as an IEEE 802
.
1Q-tagged frame
.
This field is located at the same position as the EtherType/length field in untagged frames, and is thus used to
distinguish the frame from untagged frames. The next 3 bits is the Tag control information (TCI) field which refers
to the IEEE 802
.
1p class of service and maps to the frame priority level. The next one bit is the Drop Eligible
Indicator (DEI) field which may be used separately or in conjunction with PCP to indicate frames eligible to be
dropped in the presence of congestion. The last 12 bits is the VLAN identifier (VID) field specifying the VLAN to
which the frame belongs.
Under the 802
.
1Q VLAN menu, there are three submenus which are
Setting
,
PVID Setting
, and
VLAN Table
as
shown in Figure 2.114.
Figure 2.114 802
.
1Q VLAN Dropdown Menu
2.13.2.1 802
.
1Q VLAN Settings
Figure 2.115 shows the 802
.
1Q VLAN Setting webpage which allow the users to add new tagged
-
based VLAN to
the managed switch. Please follow the following procedure to setting up the 802
.
1Q VLAN on the switch
.
1. Go to
802
.
1Q VLAN,
then select
Setting
submenu
.
2. Fill in appropriate Name, VID, Member Ports, and Tagged Ports as show in Figure 2.115
The description of
each fields is summarized in Table 2.40. Then, click
Add/Modify
button. Note to select multiple
Member
Ports
or multiple
Tagged Port
s, press and hold the
Ctrl
key while selecting multiple ports.
3. Go to
802
.
1Q VLAN
’s PVID Setting
described in the next subsection.
4. Choose the same ports, and enter PVID (which is the same as VID), see Figure 2.116.
To remove any of the VLAN from the 802
.
1Q VLAN setting, click the
Remove
button at the end of that particular
VLAN record as shown in Figure 2.115.