Method for assuring reliability of data package transmission in simple network management protocol

This invention relates to a guaranteeing method for the reliability of TRAP data packet transfer in a simple network management protocol(SNMP). SNMP TRAP data packet is transferred based on UDP protocol, since UDP has no detection and resending system, data packets are often lost in transfer. This method can realize detection to SNMP TRAP ensuring finding lost of TRAP in transfer and ask for resending including: the sending source numbers every TRAP data packet continuously according to the sequence to be inserted into its VB field to be sent out, the receive end judges if the numbers of received TRAP packet are continued and asks the send source to re-number the lacked ones. 本发明涉及一种简单网络管理协议(SNMP)中TRAP数据包传送的可靠性保证方法。SNMP TRAP数据包是基于UDP协议传送的，由于UDP协议本身没有检验与重发机制，在传送过程中就会经常发生丢失数据包的现象，不能保证数据传送的完整性，即不能保证网管与设备之间TRAP数据的一致性。本发明的方法用于实现SNMP TRAP的校验机制，可以保证SNMP TRAP在传送过程中，能够及时发现TRAP的丢失并要求重发。包括：发送源端为每一个TRAP数据包按发送顺序进行连续的流水编号，该流水编号插入在TRAP数据包的VB字段中一起发送；接收端判断接收的TRAP数据包的编号连续性，当TRAP数据包的编号不连续时，要求发送源端重发编号缺少的TRAP数据包。