The IetfBaseNetworkInterfaceTypedefines the core set of properties needed to model a network interface based on the definition provided by IETF. Figure 4illustrates the structure of the IetfBaseNetworkInterfaceType.

Figure 4– IetfBaseNetworkInterfaceType

The IetfBaseNetworkInterfaceTypeis formally defined in Table 43.

Table 43– IetfBaseNetworkInterfaceType definition

Attribute	Value
BrowseName	IetfBaseNetworkInterfaceType
IsAbstract	False
References	NodeClass	BrowseName	DataType	TypeDefinition	Other
Subtype of the BaseObjectType
HasInterface	ObjectType	IIetfBaseNetworkInterfaceType
Applied from IIetfBaseNetworkInterfaceType (see 5.2.1)
HasComponent	Variable	AdminStatus	InterfaceAdminStatus	BaseDataVariableType	M
HasComponent	Variable	OperStatus	InterfaceOperStatus	BaseDataVariableType	M
HasComponent	Variable	PhysAddress	String	BaseDataVariableType	O
HasComponent	Variable	Speed	UInt64	AnalogUnitType	M
HasLowerLayerInterface	Object	<InterfaceName>		BaseObjectType	OP
Conformance Units
BNM IETF Interface Base Info

The BrowseNameof this Objectshall be the same as the ifName of the corresponding IETF object (see IETF RFC 2863: The Interfaces Group MIB).

For the formal definition of AdminStatus, OperStatus, PhysAddressand Speedplease refer to section 5.2.1.

The HasLowerLayerInterface Referencepoints to an Objectimplementing the IIetfBaseNetworkInterfaceTypeused to indicate a hierarchical connection of network interfaces. This is used to indicate the relation e.g. between a VLAN interface and the actual physical interface. A VLAN interface shall additionally implement IVlanIdType.

Each instance of the IetfBaseNetworkInterfaceTypeshall point to zero or one instance of PriorityMappingTableTypeor a subtypeusing a UsesProrityMappingTable Referenceor a subtype. The referenced PriorityMappingTable is used for the prioritisation of network messages injected to the network using this network interface. If an instance of type IetfBaseNetworkInterfaceTypehas no reference to a PriorityMappingTable, the PriorityMappingTable of the next lower layer interface of type IetfBaseNetworkInterfaceTypeshall be used. An example for this is shown in Annex A.2for “eth0.100”.

Note: It is recommended that within one network domain that all interfaces should have consistent MappingTables assigned. This ensures consistent use of Quality of Service features within the network.

A network interface is linked for transmission or reception via the BrowseNameof the object of type IetfBaseNetworkInterfaceType.

Note: An example for a simplified PubSub connection is shown in Annex A.2.

The components of the IetfBaseNetworkInterfaceTypehave the Attributevalues defined in Table 44.

Table 44– IetfBaseNetworkInterfaceType Attribute values for child Nodes

Source Path	Value Attribute	Description Attribute
Speed EngineeringUnits	NamespaceUri: http://www.opcfoundation.org/UA/units/un/cefact UnitId: 4337968DisplayName: bit/sDescription: bit per second	-

The components of the IetfBaseNetworkInterfaceTypehave additional Referenceswhich are defined in Table 45.

Table 45– IetfBaseNetworkInterfaceType Additional References

SourceBrowsePath	Reference Type	Is Forward	TargetBrowsePath
<InterfaceName>	HasInterface	True	IIetfBaseNetworkInterfaceType