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