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VLAN Sub-Interfaces

VLAN sub-interfaces are like logical interfaces on a physical switch or router. They access only tagged packets that match the configured VLAN tag. A sub-interface has a parent interface. A parent interface can have multiple sub-interfaces, each with a VLAN ID. When you run the cloud-native router, you must associate each sub-interface with a specific VLAN. Starting in Juniper Cloud-Native Router Release 23.2, the cloud-native router supports the use of VLAN sub-interfaces in L3 mode along with the previously supported L2 mode.

Configuration Example

The VLAN sub-interfaces are configured using the Netowrk Attachment Definition (NAD) and pod YAML manifests. Please see the JCNR Use-Cases and Configuration Overview and relevant configuration examples for more information.

The JCNR controller interface configuration viewed using the show configuration command is as shown below (the output is trimmed for brevity).

For L2 mode:

For L3 mode:

On the vRouter, a VLAN sub-interface configuration is as shown below:

For L2 mode:

For L3 mode: