N-Tron Switch 708M12 User Manual download pdf (Page 98)

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Example 5 – Basic understanding of Overlapping VLANs

Receiving

Port #

Tagged VID

in packet

Destination

Address

Transmitting

Port #s

Notes

TX1 Untagged MAC on port TX2,

VID=4

TX2 Unicast Traffic

TX1 Untagged MAC on port TX3 TX2 Floods VLAN 4

TX1 VID 4 MAC on port TX2,

VID=4

TX2 Strips VID off packet

TX1 VID 4 Unknown MAC TX2 Strips VID off packet & Floods VLAN 4

TX2 Untagged MAC on port TX1,

VID=2

TX1 Unicast Traffic

TX2 Untagged MAC on port TX5,

VID=2

TX5 Unicast Traffic

TX2 VID 2 or 3 MAC on port TX5,

VID=2 and 3

TX5 Strips VID off packet (or floods if MAC

is unknown for VID)

TX2 Untagged Unknown MAC TX1, TX3-TX8 Floods VLAN 2

TX3 Untagged MAC on port TX1,

VID=3

TX2, TX4-TX8 Floods VLAN 3

TX3 Untagged MAC on port TX2,

VID=3

TX2 Unicast Traffic

TX3 Untagged MAC on port TX5,

VID=3

TX5 Unicast Traffic

TX3 VID 2 or 3 MAC on port TX2,

VID=2 and 3

TX2 Strips VID off packet (or floods if MAC

is unknown for VID)

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