VLAN Pruning
VLAN pruning limits which VLANs are allowed on trunks to reduce unnecessary traffic and risk.
Updated: 2026-03-06
Definition
VLAN pruning restricts trunk links to carry only the VLANs that are actually needed.
It reduces broadcast traffic and lowers the chance of VLAN hopping or misconfiguration impact.
Key points
- Allow only required VLANs on trunks
- Reduces broadcast noise
- Improves segmentation hygiene
Common mistakes
- Allowing all VLANs on every trunk by default.
- Pruning without understanding dependencies (breaks connectivity).
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