diff --git a/schemas/vlan_vxlan.yml b/schemas/vlan_vxlan.yml
index c55ae1a..026327e 100644
--- a/schemas/vlan_vxlan.yml
+++ b/schemas/vlan_vxlan.yml
@@ -20,6 +20,7 @@ nodes:
     attributes:
       - name: vlan_id
         kind: Number
+        unique: true
         description: VLAN ID (1-4094)
       - name: name
         kind: Text