N-Tron 708M12 user manual Example 5 Basic understanding of Overlapping VLANs

Example 5 – Basic understanding of Overlapping VLANs

Receiving	Tagged VID	Destination	Transmitting	Notes
Port #	in packet	Address	Port #s
TX1	Untagged	MAC on port TX2,	TX2	Unicast Traffic
		VID=4
TX1	Untagged	MAC on port TX3	TX2	Floods VLAN 4
TX1	VID 4	MAC on port TX2,	TX2	Strips VID off packet
		VID=4
TX1	VID 4	Unknown MAC	TX2	Strips VID off packet & Floods VLAN 4
TX2	Untagged	MAC on port TX1,	TX1	Unicast Traffic
		VID=2
TX2	Untagged	MAC on port TX5,	TX5	Unicast Traffic
		VID=2
TX2	VID 2 or 3	MAC on port TX5,	TX5	Strips VID off packet (or floods if MAC
		VID=2 and 3		is unknown for VID)
TX2	Untagged	Unknown MAC	TX1, TX3-TX8	Floods VLAN 2
TX3	Untagged	MAC on port TX1,	TX2, TX4-TX8	Floods VLAN 3
		VID=3
TX3	Untagged	MAC on port TX2,	TX2	Unicast Traffic
		VID=3
TX3	Untagged	MAC on port TX5,	TX5	Unicast Traffic
		VID=3
TX3	VID 2 or 3	MAC on port TX2,	TX2	Strips VID off packet (or floods if MAC
		VID=2 and 3		is unknown for VID)

(Revised 2010-11-15) Page 149 of 156