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Processing method of disordered fragmentation messages in SDN and application

A processing method and message technology, applied in the field of network communication, can solve problems such as out-of-order, out-of-order messages, retransmission and even fragmented messages of session terminals, so as to avoid forwarding delay, improve forwarding efficiency, and avoid forwarding efficiency Reduced effect

Active Publication Date: 2014-01-22
NANJING UMA SOFTWARE TECH
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Problems solved by technology

[0010] The technical problem to be solved: Aiming at the problem of out-of-sequence, retransmission and even session termination caused by the forwarding of fragmented messages and other messages along different forwarding paths in the same flow, the present invention provides a fragmentation method in an SDN network. The Processing Method and Application of Packets Out of Sequence

Method used

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  • Processing method of disordered fragmentation messages in SDN and application
  • Processing method of disordered fragmentation messages in SDN and application
  • Processing method of disordered fragmentation messages in SDN and application

Examples

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Embodiment Construction

[0048] The following takes IPv4 packets as an example, and describes how the OF switch processes packets belonging to a flow in combination with the acquisition and distribution of PMTU by the Controller.

[0049] Combine below figure 1 , describe the forwarding process of the IPv4 packet by the OF switch.

[0050] Step 1: Receive IPv4 packets, and analyze fields such as source / destination IP, Identification, Flags, and Fragment Offset. If the fragmentation flag in Flags is 0 and Offset is zero, it means that the received packet is not a fragmented packet, and proceed to step 2; otherwise, go to step 4;

[0051] Step 2: Analyze the Protocol field in the message header, and for the TCP / UDP message, obtain the source / destination Port number from the TCP / UDP message header. Combine the source / destination IP in step 1 to determine the flow described in the packet. In the present invention, messages with the same source / destination IP and source / destination Port number belong t...

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Abstract

The invention relates to a processing method of disordered fragmentation messages in an SDN (software defined network) and an application. The processing method comprises the following steps of: issuing PMTU (path maximum transmission unit) 'PathMTU' of a forwarding path and a fragmentation rule, adding stream ids (identities) to messages entering streams of the SDN, determining the belonging streams of the fragmentation messages encountered in the SDN, and forwarding the fragmentation messages according to the streams.

Description

technical field [0001] The invention relates to network communication technology, in particular to a processing method in cloud computing for solving disorder in sending fragmented messages in an SDN network. Background technique [0002] SDN is the English abbreviation of Software Defined Network (Software Defined Network). It ensures flexible control of network traffic and provides a good platform for core network and application innovation. [0003] In an SDN network, its network elements mainly include: a controller (Controller) and an OF switch (OpenFlow Switch). The former is responsible for collecting the topology information of the SDN network, the capabilities and attributes of the OF switch; and then combining the network control strategy to calculate and deliver the forwarding path (that is, the flow table) for the OF switch. The latter implements packet reception and forwarding according to the flow table; if a packet cannot be matched by the flow table, it is ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L12/801
Inventor 芮雄丽张可彦
Owner NANJING UMA SOFTWARE TECH
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