For eNBs identified by serial number, it is imperative that the OAM link port configured in the EMS matches the OAM link port obtained by the eNB during PnP procedures. If eNB obtains Candidate EMSs from DHCP, eNB receives both IP addresses and ports. If eNB obtains Candidate EMSs from DNS, eNB only receives IP addresses, no ports, and so it uses default port 162 in this case.
Two Use Cases are described below: (1) EMS and eNB OAM Link ports match and (2) EMS and eNB
896 OAM Link ports mismatch.