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What is Native VLAN

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Normally a Switch port configured as a trunk port send and receive IEEE 801.q VLAN tagged Ethernet frames.

If a switch receives untagged Ethernet frames on its Trunk port, they are forwarded to the VLAN that is configured on the Switch as native VLAN. Both sides of the trunk link must be configured to be in same native VLAN.

Consider the below example. The trunk link connecting between the Switches, and are connected using a Hub. Some computers are also connected to the Hub. Hubs and computers are not aware of tagging protocols and the Ethernet frames originating from Hubs are untagged Ethernet frames.

Native VLAN

It is not usual for a Switch port configured as a trunk port to receive untagged Ethernet frames. But it will happen if you are using Cisco VOIP phones in your network.

              Jajish Thomason Google+
Related Topics
• What is Virtual Local Area Network (VLAN)
• Advantages of VLAN
• How to create and name static VLAN
• How to view VLAN information using "show vlan" command
• Types of VLAN connection links - Trunk Links and Access Links
• VLAN Frame Tagging
• Inter-Switch Link (ISL) VLAN Tagging
• IEEE 802.1Q VLAN Tagging
• How to configure VLAN trunk link and native VLAN
• How to configure and assign a switch access port to a VLAN
• What is VLAN Trunking Protocol (VTP)
• What is VLAN Trunking Protocol (VTP) Domain
• VLAN Trunking Protocol (VTP) Modes
• VLAN Trunking Protocol (VTP) Advertisement Messages
• How to configure VLAN Trunking Protocol (VTP)
• How to view VLAN Trunking Protocol (VTP) information
• What is VLAN Trunking Protocol (VTP) Pruning
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