N-Tron 9000 user manual Example 5 Basic understanding of Overlapping VLANs

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
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

... … …

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 Filtering

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

Display Static Multicast Group Address(es)

Multicast AddressPort List

01:00:00:00:00:01	1-24
01:00:00:00:00:02	1,6,8

Port Port PVID No Name

1 A1 4

2 A2 2

3 A3 3

... … …

23 D5 3

24 D6 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.

(Revised 2010-7-2) page 142 of 145