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DES-7200 Configuration Guide Chapter 1 Interface Configuration
1-2
Untagged frame
z Untagged frames
z Tagged frames whose VID is the VLAN where the access port locates
z Tagged frames whose VID is 0
Untagged frame
An access port receives untagged frames and then adds the tag of the default
VLAN to them. The added tag will be removed before the access port sends
them out.
Tagged frame
An access port handles tagged frames in the following ways:
z When the VID (VLAN ID) of the tag is the same as the default VLAN ID, the
access port receives the frame and removes the tag before sending it out.
z When the VID (VLAN ID) of the tag is 0, the access port receives the frame.
In the tag, VID=0 is used to prioritize the frame.
z When the VID (VLAN ID) of the tag is different from the default VLAN ID
and is not 0, this frame is discarded.
1.1.1.1.2 Trunk Port
A trunk port can belong to multiple VLANs that receives and sends frames
belonging to multiple VLANs. Generally, it is used to connect devices or
computers.
Default VLAN
Because a trunk port can belong to multiple VLANs, you need to set a native
VLAN as the default VLAN. By default, the trunk port transmits the frames of all
VLANs. In order to reduce device load and minimize waste of bandwidth, you
can set a VLAN allowance list to specify the frames of which VLANs the trunk
port can transmit.
Caution
It is recommended to set the native VLAN of the trunk port on the
local device to be consistent with that of the trunk port on the
remote device. Otherwise, the trunk port cannot forward packets
properly.
Receiving and sending frames
The trunk port can receive untagged frames and the tagged frames of the
VLANs permitted by the port. All the frames of non-native VLANs sent by the
trunk port are tagged, and the frames of native VLAN are untagged.
Untagged frame