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DES-7200 Configuration Guide Chapter 1 Interface Configuration
1-3
If a trunk port receives a frame without IEEE802.1Q TAG, this frame will be
transmitted in the native VLAN of the port.
Tagged frame
If a trunk port receives a tagged frame, it handles the frame in the following
ways:
z When the trunk port receives a tagged frame whose VID is the same as
that of its native VLAN, this frame is accepted. The tag will be removed
before it sends the frame.
z When the trunk port receives a tagged frame whose VID is different from
that of its native VLAN but is permitted by the port, the frame is accepted.
The tag is kept unchanged when it sends the frame.
z When the trunk port receives a tagged frame whose VID is different from
that of its native VLAN and is not permitted by the port, the frame is
discarded.
Note
Untagged packets are ordinary Ethernet packets that can be
recognized by the network cards in PCs for communication.
Tagging refers to append four bytes of VLAN information, namely
the VLAN tag header, at the end of the source MAC address and
the destination MAC address.
1.1.1.1.3 Hybrid port
A hybrid port can belong to multiple VLANs that receives and sends packets of
multiple VLANs. It can be used to connect devices or computers. The difference
between the hybrid port and the trunk port is that the hybrid port sends the
untagged frames of multiple VLANs, but the trunk port sends only the untagged
frames of the default VLAN. Note that the VLAN that a hybrid port is going to
join must already exist.
1.1.1.3 L2 Aggregate Port
An aggregate port consists of several physical ports. Multiple physical
connections can be bound into a simple logical connection, which is called an
aggregate port (hereinafter referred to as AP).
For layer 2 switching, an AP works like a switch port of high brandwidth. It
increases link bandwidth by using the bandwidth of multiple ports together. In
addition, the frames that pass through the L2 aggregate port will undergo traffic
balancing on the member ports of the L2 aggregate port. If one member link of
AP fails, the L2 aggregate port automatically transfers the traffic on this link to
other working member links, making the connection more reliable.