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Discovery method, router and node equipment of path maximum transmission unit

A discovery method and router technology, applied in the field of data communication, can solve the problems of waste of bandwidth resources, long time consumption, low efficiency, etc., and achieve the effect of reducing the number of round trips, saving transmission time, and saving bandwidth resources.

Active Publication Date: 2009-12-30
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If according to the PMTU discovery mechanism of the prior art, during a PMTU discovery process, figure 1 The source node in needs to repeatedly send data packets ( figure 1 The source node sent a total of 5 data packets), but only one of these data packets was effectively sent to the destination node, resulting in a waste of bandwidth resources
Moreover, in the PMTU discovery mechanism of the prior art, the source node needs to wait to receive the ICMP error message triggered by the previous data message before sending the next data message. The round trip time also causes the PMTU discovery mechanism of the prior art to take a long time and have low efficiency

Method used

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  • Discovery method, router and node equipment of path maximum transmission unit
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  • Discovery method, router and node equipment of path maximum transmission unit

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Embodiment Construction

[0049] The main idea of ​​the present invention is: the purpose of PMTU discovery is to obtain the PMTU of the path from the source node to the destination node, so the source node does not need to care about the MTU of each router in the middle of the path, so the MTU announcement of the source node can be made by shielding the intermediate router. Reduce message interaction. In the embodiment of the present invention, the source node can only send a data message once, and then the last hop router (or destination node) notifies it of the PMTU value of the entire path, thereby greatly reducing the number of interactive messages in the PMTU discovery process , improve the utilization rate of network bandwidth, reduce the number of times of message reciprocation, speed up the PMTU discovery process, and improve the discovery efficiency; and, the present invention can be compatible with the existing PMTU discovery mechanism, and when some routers in the path do not support the pre...

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Abstract

The invention provides a discovery method, a router and node equipment of a path maximum transmission unit. The method realizes the discovery of PMTU by detecting the MTU of a router in the message length value transfer path of a message. According to the invention, the method can be compatible with the PMTU discovery mechanism in the prior art, the bandwidth resource can be saved, and the discovery efficiency of PMTU can be improved.

Description

technical field [0001] The present invention relates to the technical field of data communication, in particular to a method for discovering a path maximum transmission unit (PMTU, Path Maximum Transmission Unit), a router and a node device Background technique [0002] The maximum transmission unit (MTU, Maximum Transmission Unit) refers to the maximum data packet size that can be passed on a certain level of a communication protocol. The MTU parameter is usually related to the communication interface of the node device, such as a network interface card, a serial port, and the like. Each node device that the packet passes through in the path from the source node to the destination node may have different MTUs, and the smallest MTU on this path is the PMTU of this path. [0003] In order to reduce the processing pressure of intermediate forwarding devices and make reasonable use of network resources, in Internet Protocol Version 6 (IPv6, Internet Protocol Version 6), IPv6 p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L47/36
Inventor 孙策周迪
Owner NEW H3C TECH CO LTD
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