Patent ID: 8572270

Claim:
A method for backing up a Transmission Control Protocol (TCP) connection implemented by a transmitting end, wherein the transmitting end comprises an Active Main Board (AMB) and Standby Main Board (SMB), the method comprising: obtaining, by the AMB of the transmitting end, boundary information of a data to be transmitted along an active route to a peer side of the TCP connection as a plurality of packets segmented from the data to be transmitted, wherein the boundary information of the data to be transmitted comprises a begin sequence number and an end sequence number of the packets segmented from the data to be transmitted; and backing up the data to be transmitted and the boundary information of the data to be transmitted by transmitting the data to be transmitted and the boundary information of the data to be transmitted from the AMB to the SMB of the transmitting end before the AMB transmits part or all of the packets segmented from the data to be transmitted along the active route to the peer side of the TCP connection.