HP ProCurve series 2500 Management And Configuration Manual page 264

Configuring Advanced Features
Port-Based Virtual LANs (Static VLANs)
Figure 9-54. Example of Tagged and Untagged VLAN Port Assignments
I
I
I
9-70
Blue
VLAN
Server
Red
5 6
VLAN
4
Switch
"X"
3
Red
2 1
Server
Green
Green
VLAN
Server
Ports 1-6: Untagged
Port 7: Red VLAN Untagged
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 802.1Q-compliant.
• 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 9-54 (above), the Red VLAN must
be untagged on port X7 and Y5 and the Green VLAN must be tagged on
port X7 and Y5, or vice-versa.
Blue
White
Server
Red VLAN: Untagged
Green VLAN: Tagged
7 5
Red
VLAN
Ports 1-4: Untagged
Port 5: Red VLAN Untagged
Green VLAN Tagged
White
VLAN
4 3
Switch
"Y"
1 2
Green
VLAN