Native VLAN

Untagged ingress packets are destined to the native VLAN. An interface can be configured in one of 2 native modes - native untagged or native tagged.

A native untagged port accepts any untagged or tagged (with native VLAN ID) traffic on ingress.

Packets that egress on a native untagged port in the native VLAN will not have an 802.1Q header. A native tagged port accepts only tagged traffic (with native VLAN ID) on ingress.

Any untagged packet ingress on a native tagged port is always dropped. Packets that egress on a native tagged port in the native VLAN will always have an 802.1Q header.

Relevant configuration

(switch#) Configure a VLAN as native.

enable
configure terminal
vlan 3
exit
interface ethernet 1/1
switchport mode hybrid
switchport access vlan 3

Show commands to validate functionality

(switch#)

show interface switchport

Expected results

  • Administrators can create a VLAN.
  • Administrators can assign a native VLAN to the physical interface.
  • Administrators can configure an IP address on the VLAN interface.
  • Administrators can successfully ping the other switch’s VLAN interface.

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