The value of the SD-WAN UNI Identifier Service Attribute is a string that is used to allow the Subscriber and Service Provider to uniquely identify the UNI.
[R57] The value of the SD-WAN UNI Identifier Service Attribute MUST be an Identifier String.
[R58] The value of the SD-WAN UNI Identifier Service Attribute MUST be unique among all UNIs in SWVCs (SD-WAN Services) purchased by the Subscriber from the Service Provider.
As an example, the Subscriber and Service Provider might agree to use “NY-1" as a value of the SD-WAN UNI Identifier Service Attribute.
Note that [R57] does allow the same identifier to be used in two of the Subscriber’s SD-WAN Services if they are with different Service Providers.