Static Virtual LANs (VLANs)
802.1Q VLAN Tagging
Blue | Blue | White | White |
Server | VLAN | Server | VLAN |
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| 4 | 3 |
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VLAN |
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| Red VLAN: Untagged |
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| 4 | Switch |
| Green VLAN: Tagged |
| 5 | Switch |
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| “X” | 7 |
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| “Y” |
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Red |
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Server |
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| 1 | 2 |
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Green | Green | Red | Green |
Server | VLAN | VLAN | VLAN |
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| Ports 1 - 4: Untagged | |
Ports 1 - 6: Untagged | |||
Port 7: Red VLAN Untagged | Port 5: Red VLAN Untagged | ||
Green VLAN Tagged | Green VLAN Tagged |
■In switch X:
•VLANs assigned to ports X1 - X6 can all be untagged because there is only one VLAN assignment per port. Red VLAN traffic will go out only the Red ports; Green VLAN traffic will go out only the Green ports, and so on. Devices connected to these ports do not have to be 802.1Q- compliant.
•However, because both the Red VLAN and the Green VLAN are assigned to port X7, at least one of the VLANs must be tagged for this port.
■In switch Y:
•VLANs assigned to ports Y1 - Y4 can all be untagged because there is only one VLAN assignment per port. Devices connected to these ports do not have to be
•Because both the Red VLAN and the Green VLAN are assigned to port Y5, at least one of the VLANs must be tagged for this port.
■In both switches: The ports on the link between the two switches must be configured the same. As shown in figure