anchor.diff:            "fou"
             "xfrm"
             "ifb"
  +          "batadv"
           ])
           (assertByteFormat "MTUBytes")
           (assertMacAddress "MACAddress")
  
positive.code:         + optionalString (def.vrfConfig != { }) ''
            [VRF]
            ${attrsToSection def.vrfConfig}
          ''
          + def.extraConfig;
      };
  
negative.code:           "IgnoreCarrierLoss"
            "Xfrm"
            "KeepConfiguration"
            "BatmanAdvanced"
          ])
          # Note: For DHCP the values both, none, v4, v6 are deprecated
          (assertValueOneOf "DHCP" ["yes" "no" "ipv4" "ipv6"])
  