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).