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, | Floods VLAN 2 |
TX3 | Untagged | MAC on port TX1, | TX2, | 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) |
Revision 071108 | Page 98 of 102 |
