The SD-WAN UNI L2 Maximum Frame Size Service Attributes specifies the maximum Ethernet MAC frame size that will be accepted by the Service Provider at the UNI.
[R60] The value for the SD-WAN UNI L2 Maximum Frame Size MUST be an integer number of bytes ≥ 1522.
[D2] Any L2 Frame that crosses the Ingress UNI whose length exceeds the value of the SD-WAN UNI L2 Maximum Frame Size SHOULD be discarded.