The Epipe service is designed to carry Ethernet frame payloads, so it can provide connectivity between any two SAPs that pass Ethernet frames. The following SAP encapsulations are supported on the Epipe service:
Ethernet null
Ethernet dot1q
QinQ
While different encapsulation types can be used, encapsulation mismatch can occur if the encapsulation behavior is not understood by connecting devices and are unable to send and receive the expected traffic. For example, if the encapsulation type on one side of the Epipe is dot1q and the other is null, tagged traffic received on the null SAP can potentially be double tagged when it is transmitted out of the dot1q SAP.