How can you configure a port to support both tagged and untagged traffic for a VLAN?

Configuring a port to support both tagged and untagged traffic for a VLAN involves specifying a native VLAN ID. The native VLAN is the VLAN that is assigned to untagged frames on a trunk port. When a frame arrives on the port without a tag, it is assumed to be a member of the native VLAN. This setup allows the switch to handle traffic that is both tagged (with a VLAN ID) and untagged (which is implicit to the native VLAN).

In this configuration, using the native-vlan-id command ensures that the switch knows which VLAN to assign to frames that do not have a VLAN tag. Therefore, when untagged frames are received, they are classified under the specified native VLAN, allowing for seamless integration with devices that may not support VLAN tagging.

For a port to function effectively in this manner, the native VLAN ID must be configured correctly, ensuring compatibility with end devices and maintaining network segmentation and traffic management as intended.