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Method and device for discovering a path maximum transmission unit (PMTU)

A technology of the largest transmission unit and path, which is applied in the field of network communication, can solve problems such as decreased transmission efficiency and recombination errors, and achieve the effects of improving efficiency, reducing the impact of network performance, and reducing time spent and traffic that needs to be consumed

Active Publication Date: 2016-06-01
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the packet is fragmented due to exceeding the PMTU, the transmission efficiency will decrease because each fragmented packet needs to encapsulate a new header, and reassembly errors may occur

Method used

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  • Method and device for discovering a path maximum transmission unit (PMTU)
  • Method and device for discovering a path maximum transmission unit (PMTU)
  • Method and device for discovering a path maximum transmission unit (PMTU)

Examples

Experimental program
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Embodiment Construction

[0019] Fragmentation and reassembly of packets are performed by the network layer. When the network layer has data to be sent, it will query the MTU of the sending interface. If the length of the datagram (datagram, the network layer datagram after three layers of encapsulation) exceeds the MTU, the datagram will be fragmented at the network layer. And regenerate the three-layer header for each fragment.

[0020] Taking the IP protocol at the network layer as an example, the IP header contains information required for fragmentation and reassembly, and its structure is shown in Table 1:

[0021] Identification

R

DF

MF

Fragment Offset

[0022] Table 1

[0023] In Table 1, the Identification (identification) field is 2 bytes, and is used to carry the ID of the datagram. The source node gives each IP datagram an ID for uniquely identifying the IP datagram, and the destination node uses this ID to determine whether the received fragmented IP datag...

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Abstract

The invention provides a method for discovering a PMTU. The method is applied to a destination node in a path and comprises the following steps of: receiving a fragment message from a source node in the path; determining a detection section according to the maximum length and the minimum fragment unit of the fragment message; acquiring a detection value from the detection section according to a preset strategy, requiring the source node to reply a message with a length equal to the detection value, and determining the PMTU of the path according to whether a replied message is fragmented. The method shortens the time consumed by determining the PMTU, decreases the flow consumed by determining the PMTU, and reduces an influence on network performance.

Description

technical field [0001] The present application relates to the field of network communication technologies, and in particular to a method and device for discovering the maximum transmission unit of a path. Background technique [0002] The interface of a network device has a certain limit on the length of the packet. The maximum length of the allowed packet is related to the hardware configuration of the interface and the transmission protocol used. When the length of the message exceeds the maximum value allowed on the interface of the network device, it will be divided into several fragments, which will be encapsulated into several messages whose length does not exceed the maximum value and transmitted to the destination node, and then processed by the destination node. Reassembly; this process is called fragmentation, and the segmented message is called a fragmented message. [0003] The maximum link layer load that a network device allows to pass without segmenting the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/805H04L47/36
CPCH04L12/413H04L12/4135H04L45/26H04L47/365H04L69/166H04W48/16H04W80/02H04W80/04
Inventor 高运雷
Owner NEW H3C TECH CO LTD
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