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MEF 3.0= SD-WAN Services are specified by Service Attributes for three logical = constructs:
Several additional components are (or may be) visible to = the Subscriber but are not described by SD-WAN Service Attributes. These in= clude:
Figure 1 shows the SD-WAN Service components.
Figure 1= p>
Note that in Figure 1 one of the Subscriber sites is conn= ected to a Private or Virtual Private Cloud which may not be located at the= Subscriber=E2=80=99s physical location. This type of connection operates n= o differently in the SD-WAN Service than any of the other Subscriber Networ= k locations although for the cloud connection the SD-WAN Edge is usually a = virtual network function (VNF), whereas for the other sites the SD-WAN Edge= could be either a physical network function (PNF) or a VNF.
Two additional components, the Tunnel Virtual Connection = (TVC) and the SD-WAN Edge, are al= so described since these components are used to describe the operation of t= he SD-WAN Service. These components are shown in Figure 2 (the SD-WAN Edge = is also shown in Figure 1).
Figure 2 =E2=80=93 SD-WAN Edge and TVCs
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Figure 2 shows the SD-WAN Edge, a physical or virtual net= work function, which includes the SWVC End Point. The SD-WAN Edge has the U= NI on one side (left) and the Underlay Connectivity Services on the other s= ide (right).
Each Underlay Connectivity Service terminates at a servic= e demarcation point, i.e., UNI (since they are also services), which is sho= wn in the diagram. Depending on the type of Underlay Connectivity Service, = this could be an Ethernet UNI (as defined in MEF 10.4 - Subscriber Etherne= t Service Attributes), an IP UNI (as defined in MEF 61.1 - IP Service Attributes), = an L1 UNI (as defined in MEF 63 - Subscriber Layer 1 Service Attributes),= or analogous service demarcation for other non-MEF services.
Figure 2 also shows TVCs across the Underlay Connectivity= Services. TVCs or Tunnel Virtual Connections are point-to-point paths acro= ss the Underlay Connectivity Services that define the logical forwarding to= pology of the SD-WAN Service.
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MEF-SDCP Exam Study Reference