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Method and device for adjusting path maximum transfer unit

A technology of the largest transmission unit and detection unit, applied in transmission systems, digital transmission systems, electrical components, etc., can solve problems such as packet loss, network throughput and link performance degradation, and ineffective use of network resources, to achieve Reduce packet loss, improve utilization, improve network throughput and link performance

Inactive Publication Date: 2008-03-26
NEW H3C TECH CO LTD
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Problems solved by technology

This defect will bring the following adverse consequences: 1. When the MTU of the intermediate node becomes smaller, if the source node still sends the message with the originally found PMTU value, a large amount of packet loss will occur because the message is too long; 2. When the MTU of the intermediate node becomes larger, if the source node still sends messages with the originally discovered PMTU value, network resources will not be effectively utilized, resulting in a decrease in network throughput and link performance

Method used

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  • Method and device for adjusting path maximum transfer unit

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Embodiment Construction

[0033] In order to solve the problems in the prior art, the basic idea of ​​the present invention is: the intermediate node whose MTU value changes sends a notification message to the source node to notify the source node that its own MTU value has changed; the source node receives the message sent by the intermediate node After the notification message, a PMTU detection is initiated, and the PMTU value is updated according to the detection result.

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0035] Referring to shown in Figure 2, the method for adjusting PMTU provided by the present invention mainly includes the following steps:

[0036] Step 201: During the PMTU discovery process initiated by the source node, the intermediate node between the source node and the destination node records the so...

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Abstract

The invention provides a method for adjusting the Path Maximum Transmission Unit (PMTU), which includes the following steps: an intermediate node whose MTU value is changed transmits notification message to a source node; after the source node receives the notification message, the source node initiates the PMTU detection and renews the PMTU value according to the detection result. In addition, the invention also provides a notification alternation method of MTU, a notification alternation device of MTU and a PMTU adjustment device. By using the technical proposal of the invention, the source node can adjust timely the PMTU value according to the changes of MTU value of the intermediate node, reduce the occurrences of packet loss, improve the utilization rate of network resources, increase the network throughput and the performance of network links.

Description

technical field [0001] The present invention relates to Internet Protocol version 6 (IPv6) technology, in particular to a method and device for adjusting a path maximum transmission unit (PMTU, Path Maximal Transmit Unit). Background technique [0002] IPv6 is the second-generation standard protocol of the network layer protocol. It is an upgraded version of the Internet Protocol version 4 (IPv4). It solves the problem of the lack of IPv4 addresses well. In order to improve the efficiency of data forwarding, IPv6 does not support intermediate nodes to fragment data packets. Fragmentation of longer packets can only be performed at the source node, that is, the source node obtains the PMTU value from the source node to the destination node through the PMTU discovery mechanism. , and then use this PMTU value to determine the length of the data packet it sends. Wherein, the PMTU value from the source node to the destination node refers to the minimum and maximum transmission un...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L29/06H04L47/36
Inventor 沈志祥周迪余剑声
Owner NEW H3C TECH CO LTD
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