This section explains VLAN, which is used in automotive Ethernet switches.
Basics of Automotive Ethernet Switches
What is VLAN (Virtual LAN)?
VLAN (Virtual LAN) is a technology that allows you to create individual network environments by virtually dividing or combining physically connected networks.
Multiple ECUs are connected to an in-vehicle Ethernet switch, but they are grouped into several ECUs so that communication is possible only within that group.
VLAN Image
Types of VLANs
1. Port VLAN: A method of grouping ports into arbitrary VLANs.
2.Tagged VLAN: This is a method of identifying data by adding a VLAN tag to FRAMES. FRAMES structure changes from a normal FRAMES without VLAN.
Normal (no VLAN settings) configuration image
1.Port VLAN image
2.Tag VLAN image
2-2.Ethernet FRAMES structure when using tagged VLAN
- Normal FRAMES (without VLAN settings)
- Tagged FRAMES
Benefits of VLANs
Because networks can be virtually divided, there is no need to prepare SWITCHES for each network, which reduces costs. Intentionally dividing networks and preventing communication with unnecessary parties also improves security.
In addition, the network to be divided can be switched using VLAN settings, allowing for flexible response to changes in VLAN configuration.
Benefits of tagged VLAN
When communicating between different SWITCHES, tagged VLANs allow communication without consuming SWITCHES ports.
1.Port VLAN image
In the case of port VLANs, when communicating between SWITCHES, the number of ports is consumed equal to the number of VLANs.
2.Tag VLAN image
In the case of DAG VLAN...only one port is consumed for communication between SWITCHES.
This port is a trunk port that can connect to all VLANs.
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