Configuring Inter-VLAN Communication Using Layer-2 Subinterfaces

This section describes how to implement inter-VLAN communication by configuring Layer-2 subinterfaces.

Context

The device supports creating subinterfaces on Layer-2 Ethernet and Layer-2 Eth-Trunk interfaces. Using a subinterface to terminate a VLAN allows for inter-VLAN forwarding.

Procedure

Access the system view.
```
system-view
```
Switch the Layer-3 Ethernet interface to a Layer-2 Ethernet interface.
1. Access the interface view.
```
interface interface-type interface-number
```
2. Configure a Layer-3 Ethernet interface to work in Layer-2 mode.
```
portswitch
```
3. Return to the system view.
```
quit
```
Create Layer-2 subinterfaces.
1. Create a subinterface and access the subinterface view.
```
interface interface-type interface-number.subinterface-number
```
2. Configure the encapsulation type for the subinterface and associate a VLAN ID with the subinterface.
```
vlan-type dot1q vlan-id
```
  Each subinterface receives or forwards only packets that carry the specified VLAN tag.
3. Configure the subinterface as a Layer-2 subinterface.
```
portswitch
```
4. Return to the system view.
```
quit
```
5. Repeat the previous substeps to create multiple Layer-2 subinterfaces.
Add the subinterfaces created in 3 to the same VLAN so that the subinterfaces can communicate.
1. Create a VLAN and access the VLAN view.
```
vlan vlan-id
```
2. Add the subinterfaces to the same VLAN.
```
port interface-type interface-number.subinterface-number command to add the subinterfaces created in 3
```
  Subinterfaces must be added to the same VLAN to communicate with each other.