Inter-VLAN Routing

Inter-VLAN routing allows devices in different VLANs to communicate using a Layer 3 device.

Updated: 2026-03-05

Definition

Because VLANs are separate broadcast domains, traffic between VLANs requires routing.

This is done via a router (router-on-a-stick) or a Layer 3 switch using SVIs.

Key points

Requires L3 device (router or L3 switch)
Uses gateways (SVI or router subinterface)
ACLs can control inter-VLAN access

Common mistakes

Assuming VLANs can talk without routing.
Missing or wrong default gateway on hosts.

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