Native VLAN

Native VLAN is the VLAN sent untagged on an 802.1Q trunk.

Updated: 2026-03-06

Definition

On an 802.1Q trunk, frames for the native VLAN are sent untagged by default.

Native VLAN mismatches can cause traffic leaks and connectivity problems.

Key points

Untagged VLAN on trunk
Must match on both sides
Security best practice: avoid using VLAN 1

Common mistakes

Native VLAN mismatch causing unexpected behavior.
Leaving native VLAN as VLAN 1 everywhere without review.

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Cisco CCNA (200-301)

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