Communication system and communication method

Abstract

Each of hub nodes (100,101) transmits, from its ports (1,2), keep-alive frames to be broadcasted by relay nodes constituting communication media (106,107). Arrivals of the keep-alive frames are monitored at the respective ports. During a normal state, the two communication media connected to the ports (1,2) are used virtually as a single node so as to expand the communication band. During detection of a trouble, only the communication medium, which is connected to a port where no trouble has been detected, is used to continue the communication.

Description

technical field [0001] The present invention relates to a communication system that realizes high reliability, and particularly to a communication system with high reliability that transmits data frames using a plurality of bandwidth to suppress congestion, and when a failure is detected, communication continues using only the communication path where the failure was not detected. Background technique [0002] In recent years, computer networks have made great progress in various fields of society. They are not only widely used as communication means for information transmission by email and information disclosure by Web sites, but also play an important role as an infrastructure for providing various services. social role. [0003] In today's society that cannot be separated from computer networks, due to accidents such as failure of devices constituting the network, cuts of communication cables, or narrowing of the communication bandwidth due to congestion, etc., events t...

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Problems solved by technology

[0015] However, even if the reliability of the link between adjacent nodes is improved, the two communicating nodes cannot communicate only due to accidents such as failure of any relay node on the communication path

[0016] In addition, since link aggregation is applicable only between two nodes adjacent to each other, it cannot be applied to a network in which two communicating nodes are connected through multiple communication paths including one or more relay nodes.

[0017] Also, when OSPF and BGP routing protocols are used, since it takes time to detect a failure on the communication path, communication cannot be continued until the failure is detected

[0018] And, even if a failure is detected, since it takes time to obtain a communication path that does not have a failure again, the period before restarting communication by switching from a communication path that has failed to a communication path that does not have a failure time, communication will be interrupted

[0019] In addition, since detailed and advanced knowledge about Link Aggregation is required to set Link Aggregation, it is difficult for general users to perform the setting, which increases the possibility of wrong settings and makes it impossible to efficiently use the network.

[0020] Next, in the failure detection method used in combination with NAT technology, that is, in the method in which nodes performing communication detect a failure on the communication path by sending and receiving monitoring packets (such as PING packets) specifying the respective counterpart nodes as destinations , as the number of counterpart nodes increases, the number of monitoring packets sent also increases, so the processing load for detecting failures is very large

[0021] In addition, since it is necessary to set the destination addresses of all counterpart nodes, as the number of counterpart nodes increases, the number of items to be set also increases, thus increasing the possibility of wrong settings by the network administrator.

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