N-Tron 9000 Series user manual Example 5 Basic understanding of Overlapping VLANs, 17/2007 135

Example 5 – Basic understanding of Overlapping VLANs

VLAN Configuration View Ports Configuration View

		VLAN Status	: Enable
VLAN ID	VLAN Name	Untagged Port(s)	Tagged Port(s) Mgmt Port Admit Mirror Port				Port	Port	PVID
1	Default VLAN	--	--	YES	All	0
							No	Name
2	VLAN -2	A1-A6,B1-B6,C1-C6,D1-D6	--	YES	All	0	1	A1	4
3	VLAN -3	A2-A6,B1-B6,C1-C6,D1-D6	--	YES	All	0	2	A2	2
							3	A3	3
4	VLAN -4	A1-A2	--	YES	All	0
							...	…	…
							23	D5	3
							24	D6	3

Receiving	Tagged VID	Destination	Transmitting	Notes
Port #	in packet	Address	Port #s
Port A1	Untagged	MAC on port A2	Port A2	Unicast Traffic
Port A1	Untagged	MAC on port A3	--	Packet Discarded
Port A1	VID 4	MAC on port A2	Port A2	Strips VID off packet
Port A1	VID 4	Unknown MAC	Port A2	Strips VID off packet & Floods VLAN
				4
Port A2	Untagged	MAC on port A1	Port A1	Unicast Traffic
Port A2	Untagged	MAC on port A5	Port A5	Unicast Traffic
Port A2	VID 2 or 3	MAC on port A5	Port A5	Strips VID off packet
Port A2	Untagged	Unknown MAC	Port A1,B1-D6	Floods VLAN 2
Port A3	Untagged	MAC on port A1	--	Packet Discarded
Port A3	Untagged	MAC on port A2	Port A2	Unicast Traffic
Port A3	Untagged	MAC on port A5	Port A5	Unicast Traffic
Port A3	VID 2 or 3	MAC on port A2	Port A2	Strips VID off packet

Example 6 – Basic understanding of VLANs with Multicast Filt ering

VLAN Configuration View Ports Configuration View

		VLAN Status	: Enable
VLAN ID	VLAN Name	Untagged Port(s)	Tagged Port(s)	Mgmt Port	Admit	Mirror Port

1	Default VLAN	--	--	YES	All	0
2	VLAN -2	A1-A6,B1-B6,C1-C6,D1-D6	--	YES	All	0
3	VLAN -3	A2-A6,B1-B6,C1-C6,D1-D6	--	YES	All	0
4	VLAN -4	A1-A2	--	YES	All	0

Port Port PVID No Name

1 A1 4

2 A2 2

3 A3 3

... … …

Display Static Multicast Group Address(es)

Multicast Address Port List

01:00:00:00:00:01 1-24

01:00:00:00:00:02 1,6,8

23 D5

24 D6

3

3

Receiving	Tagged VID	Destination		Transmitting	Notes
Port #	in packet	Address		Port #s
Port 1	Untagged	01:00:00:00:00:01		Port 2	Goes to Ports 1-24, but port 1 can only
					send to Port 2 (VLAN 4)
Port 1	Untagged	01:00:00:00:00:02	--		Packet Discarded
Port 2	Untagged	01:00:00:00:00:01		Port 1,3-24	Goes to Ports 1-24, but won’t go back out
					the port it came in on
Port 2	Untagged	01:00:00:00:00:02		Port 1,6,8	Goes to ports 1,6,8
Port 3	Untagged	01:00:00:00:00:01		Port 2,4-24	Goes to Ports 1-24, but can’t talk to Port 1
					since it is on a different VLAN
Port 3	Untagged	01:00:00:00:00:02		Port 6,8	Goes to Port 1,6,8, but can’t talk to Port 1
					since it is on a different VLAN

Note: If there are multiple ports on different VLANs, the 9000 will apply the static multicast address to the lowest VLAN-ID that is associated with one of the ports assigned to the static multicast address. If the lowest VLAN-ID contains all the ports assigned to the static multicast address (an umbrella VLAN), it will function for all those ports with no problems. This can be achieved with overlapping VLANs.

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