HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 39
Example of Connecting Multiple VLANs Through the Same Link
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Static Virtual LANs (VLANs) Static VLAN Operation Red Server Blue Server Red VLAN ProCurve Switch The same link carries Red VLAN and Blue VLAN traffic. ProCurve Switch Red VLAN Red VLAN Blue VLAN Blue VLAN Figure 2-4. 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 networks 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 (configured as untagged) must be used to connect separate VLANs to non-802.1Q devices. The legacy (non-802.1Q compliant) switch requires a separate link for each VLAN. Red VLAN Red Server Blue Server VLAN tagging enables the Link to carry Red VLAN and Blue VLAN Traffic Non-802.1Q Switch Blue VLAN Red VLAN Blue VLAN ProCurve Switch Red VLAN Blue VLAN ProCurve Switch Blue VLAN Red VLAN Figure 2-5. Example of Tagged and Untagged VLAN Technology in the Same Network For more information on VLANs, refer to: ■ "Overview of Using VLANs" (page 2-47) ■ "Menu: Configuring VLAN Parameters (page 2-21) 2-11