HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 66

Static Virtual LANs (VLANs) 802.1Q VLAN Tagging ■ 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. 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: • "Inbound Tagged Packets" • "Untagged Packet Forwarding" and figure 2-7 • "Tagged Packet Forwarding" and figure 2-8 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 802.1Qcompliant, 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 Server System Server S1 X1 X2 Switch "X" X3 X6 X5 X4 Red VLAN: Untagged Green VLAN: Tagged Red VLAN: Untagged Green VLAN: Tagged AT2 (Protocol) VLAN: Untagged System Server S2 Y1 Switch Y6 "Y" Y2 Y5 Y4 Y3 Green VLAN Only System Server S3 Apple Talk VLAN 1 Red VLAN Green VLAN Red VLAN Green VLAN Apple Talk VLAN 2 Figure 2-28. Example of Networked 802.1Q-Compliant Devices with Multiple VLANs on Some Ports 2-43