6 IP layer

37.4823GPPE1 signalling transportRelease 17TS

The gNB-CU-CP, gNB-CU-UP, ng-eNB-CU-CP, ng-eNB-CU-UP, eNB-CP and eNB-UP shall support IPv6 (IETF RFC 8200 [3]) and/or IPv4 (IETF RFC 791 [4]).

The IP layer of E1 only supports point-to-point transmission for delivering E1AP message.

The gNB-CU-CP, gNB-CU-UP, ng-eNB-CU-CP, ng-eNB-CU-UP, eNB-CP and eNB-UP shall support the Diffserv Code Point marking as described in IETF RFC 2474 [5].