HP ProCurve Switch 6120G/XG Management Manual page 66

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For a summary and flowcharts of untagged and tagged VLAN operation on
inbound traffic, refer to the following under "VLAN Operating Rules" on pages
2-13 through 2-16:
Example. In the following network, switches X and Y and servers S1, S2, and
the AppleTalk server are 802.1Q-compliant. (Server S3 could also be 802.1Q-
compliant, but it makes no difference for this example.) This network includes
both protocol-based (AppleTalk) VLANs and port-based VLANs.
AT1 (Protocol) VLAN:
Untagged
AppleTalk System
Server Server S1
X1 X2
Switch
X3
"X"
X6
X5 X4
Apple
Red
Talk
VLAN
VLAN 1
Figure 2-28. Example of Networked 802.1Q-Compliant Devices with Multiple
VLANs on Some Ports
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 either makes it easier to
manage your VLAN assignments, or if the authorized, inbound traffic for
all VLANs on the port will be tagged.
• "Inbound Tagged Packets"
• "Untagged Packet Forwarding" and figure 2-7
• "Tagged Packet Forwarding" and figure 2-8
Red VLAN: Untagged
Green VLAN: Tagged
Red VLAN: Untagged
Green VLAN: Tagged
AT2 (Protocol) VLAN:
Untagged
Green
VLAN
System
Server S2
Y1
Switch
Y6
Y2
"Y"
Y5 Y4 Y3
Apple
Red Green
Talk
VLAN
VLAN
VLAN 2
Static Virtual LANs (VLANs)
802.1Q VLAN Tagging
Green VLAN
Only
System
Server S3
2-43