Dear.
Logically, the eCNS280 consists of a vUGW, a vUSN, and a vTSN. The vUGW includes the S-GW, and P-GW. The vUSN includes the MME, HSS, and Trunk-GW.
You can consult all details following the next link:
http://support.huawei.com/hedex/hdx.do?docid=EDOC1000184518&lang=enFor any comment or doubts, please don't hesitate to let us know