HP procurve series 4100gl Management And Configuration Manual page 245

Figure 11-2. Example of Overlapping VLANs Using the Same Server
Similarly, using 802.1Q-compliant switches, you can connect multiple VLANs
through a single switch-to-switch link.
Figure 11-3. Example of Connecting Multiple VLANs Through the Same Link
Introducing Tagged VLAN Technology into Networks Running Legacy
(Untagged) VLANs. You can introduce 802.1Q-compliant devices into net-
works that have built untagged VLANs based on earlier VLAN technology. The
fundamental rule is that legacy/untagged VLANs require a separate link for
each VLAN, while 802.1Q, or tagged VLANs can combine several VLANs in one
link. This means that on the 802.1Q-compliant device, separate ports (config-
ured as untagged) must be used to connect separate VLANs to non-802.1Q
devices.
Port-Based Virtual LANs (VLANs) and GVRP
Switch 4108
Switch HP
Procurve
2524
Switch
Port-Based Virtual LANs (Static VLANs)
HP
HP
Procurve
Switch
Switch
11-5