HP PROCURVE 2610 Advanced Traffic Management Manual page 58

Static Virtual LANs (VLANs)
Port-Based Virtual LANs (Static VLANs)
VLAN tagging gives you several options:
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For example, in the following network, switches X and Y and servers S1 and
S2 are 802.1Q-compliant. (Server S3 could also be 802.1Q-compliant, but it
makes no difference for this example.)
Figure 2-26. Example of Networked 802.1Q-Compliant Devices with Multiple
2-32
Since the purpose of VLAN tagging is to allow multiple VLANs on the same
port, any port that has only one VLAN assigned to it can be configured as
"Untagged" (the default).
Any port that has two or more VLANs assigned to it can have one VLAN
assignment for that port as "Untagged". All other VLANs assigned to the
same port must be configured as "Tagged". (There can be no more than
one Untagged VLAN on a port.)
If all end nodes on a port comply with the 802.1Q standard and are
configured to use the correct VID, then, you can configure all VLAN
assignments on a port as "Tagged" if doing so makes it easier to manage
your VLAN assignments, or for security reasons.
Server
S1
Red VLAN: Untagged
Green VLAN: Tagged
Red VLAN: Untagged
X1
Green VLAN: Tagged
Switch
X2
"X"
X4 X3
Red Green
VLAN VLAN
VLANs on Some Ports
Server
S2
Red VLAN: Untagged
Green VLAN: Tagged
Y1
Green VLAN only
Switch
Y5 Y2
"Y"
Y4 Y3
Red Green
VLAN VLAN
Server
S3