Default VLAN and Native VLAN

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• a VLAN with ID 1 is called the default VLAN
  • cannot be changed
  • all ports on a switch default to being in VLAN 1
    • unless changed
  • when implementing VLANs, avoid sending user data traffic over the default VLAN
    • it should remain unused or used for only inter-switch protocol traffic, where necessary
      • E.g., spanning tree traffic would be permitted to run over VLAN 1
    • make sure unused ports are not assigned to VLAN 1
• a native VLAN is one which any untagged traffic is put when receiving frames over a trunk port
  • when a switch receives an untagged frame over a trunk, it assigns the frame to the native VLAN
  • untagged traffic might derive from legacy devices that do not support 802.1Q frames
  • is initially set with the same VLAN ID (VID) as the default VLAN (1)
    • should change this
    • should not be the same as any other VLAN used
    • same native VID should be configured for the trunk port on both switches