diff --git a/nixos/modules/system/boot/networkd.nix b/nixos/modules/system/boot/networkd.nix
index c8dadd09e9ce..413429f582de 100644
--- a/nixos/modules/system/boot/networkd.nix
+++ b/nixos/modules/system/boot/networkd.nix
@@ -291,13 +291,20 @@ let
         sectionVLAN = checkUnitConfig "VLAN" [
           (assertOnlyFields [
             "Id"
+            "Protocol"
             "GVRP"
             "MVRP"
             "LooseBinding"
             "ReorderHeader"
+            "EgressQOSMaps"
+            "IngressQOSMaps"
           ])
           (assertInt "Id")
           (assertRange "Id" 0 4094)
+          (assertValueOneOf "Protocol" [
+            "802.1q"
+            "802.1ad"
+          ])
           (assertValueOneOf "GVRP" boolValues)
           (assertValueOneOf "MVRP" boolValues)
           (assertValueOneOf "LooseBinding" boolValues)