Tagged frame with VID 0
Untagged frame
Access Port receives frames without tags, and adds a default VLAN as the tag to the frames
without tags. The added tag will be removed before the frames are sent.
Tagged frame
The Access port handles the data frames with tags in the following ways:
When VID (VLAN ID) in the TAG is the same as the default VLAN ID, the data frame is
received, and the TAG is removed before the frame is sent.
When VID (VLAN ID) in the TAG is 0, this data frame is received. In the TAG, VID=0 is
used to identify the frame priority.
When VID (VLAN ID) in the TAG is different from the default VLAN ID and is not 0, this
frame is discarded.
6.1.1.1.2 Trunk Ports
Each Trunk port can belong to multiple VLANs, and can receive and send frames that belong
to multiple VLANs. Generally, it is used to connect devices or computers of users.
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 transmit frames for all VLANs. In order to reduce
device load and minimize bandwidth consumption, you can set the VLAN allowance list to
specify frames of which VLANs to be transmitted by the Trunk port.
It is recommended to set the native vlan of the Trunk port on the local
device the same as the native vlan of the Trunk port on the remote
device. Otherwise, the port may be unable to forward packets properly.
Receiving and sending frames
The Trunk port can receive Untagged frames and the tagged frames within the allowed
VLANs. All the frames sent by Trunk Port outside the Native vlan have tags, and the frames
sent by it in the Native vlan have no tags.
Untagged frame
If the Trunk port receives a frame without IEEE802.1Q TAG, this frame will be transmitted in
the Native VLAN where this port is located.
Tagged frame
If the Trunk port receives a frame with a tag, the frame will be handled in the following ways:
When the Trunk Port receives a frame with a tag where the VID is the same as the
Native vlan of this Trunk port, this frame is accepted. The tag will be removed before the
frame is sent.
To Next Page
Loading...
Need help?
General