Example 2

The following is an example of an invalid tagged VLAN.

Green (dashed) flow

Between port1 and port2, frames are assigned to VLAN 1 at ingress, and then the tag is removed at egress.

Blue (dotted) flow

Incoming on port3, a tagged frame with VLAN value 100 is allowed because 100 is the port3 native VLAN (the hardware VLAN table accepts a tagged or untagged match to a valid VLAN).

The frame will be sent on port1 and port4 (with frame tag 100).