The IP address of the primary software load server. If the value of the zhoneSysSwPriLoadServer is set to 0.0.0.0 then no primary load server is available. If the system is unable to load the software file from the Primary Load Server, the system should attemmpt to load the software from the the Secondary Load Server (zhoneSysSecLoadServer). This value must be set on each download request.
Sources for this description
Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community)