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6/28/2007 page 141 of 145
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 P1-P12 -- YES All 0
3 VLAN -3 P2-P12 -- YES All 0
4 VLAN -4 P1-P2 -- YES All 0
Receiving
Port #
Tagged VID
in packet
Destination
Address
Transmitting
Port #s
Notes
Port P1 Untagged MAC on port P2 Port P2 Unicast Traffic
Port P1 Untagged MAC on port P3 -- Packet Discarded
Port P1 VID 4 MAC on port P2 Port P2 Strips VID off packet
Port P1 VID 4 Unknown MAC Port P2 Strips VID off packet & Floods VLAN
4
Port P2 Untagged MAC on port P1 Port P1 Unicast Traffic
Port P2 Untagged MAC on port P5 Port P5 Unicast Traffic
Port P2 VID 2 or 3 MAC on port P5 Port P5 Strips VID off packet
Port P2 Untagged Unknown MAC Port P4 Floods VLAN 2
Port P3 Untagged MAC on port P1 -- Packet Discarded
Port P3 Untagged MAC on port P2 Port P2 Unicast Traffic
Port P3 Untagged MAC on port P5 Port P5 Unicast Traffic
Port P3 VID 2 or 3 MAC on port P2 Port P2 Strips VID off packet
Port
No
Port
Na
me
PVID
1 P1 4
2 P2 2
3 P3 3
4 P4 2
5 P5 3
... … …
11 P11
3
12 P12
3