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Terminal equipment real-time connecting and disconnecting sensing method based on SDN

A terminal equipment and port technology, applied in the Internet field, can solve the problem of frequently updating the host information table, etc., to achieve the effect of comprehensive perception and improved reliability

Active Publication Date: 2013-08-28
JIANGSU FUTURE NETWORKS INNOVATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to provide an SDN-based method for real-time access and departure perception of terminal equipment. Subsequent search for usage efficiency, while solving the shortcomings of existing controllers that frequently update the host information table

Method used

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  • Terminal equipment real-time connecting and disconnecting sensing method based on SDN
  • Terminal equipment real-time connecting and disconnecting sensing method based on SDN

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Embodiment Construction

[0057] A typical application case of the present invention is to sense host access in real time by receiving DHCP and ARP packets sent by the host when accessing the network.

[0058] 1) When the host uses DHCP to access the network, the controller temporarily records the location information of the source host when intercepting the DHCPDISCOVERY / DHCPREQUEST broadcast packet, and extracts the IP address and MAC address information (corresponding to yiaddr and chaddr fields in DHCPACK), combined with the previously recorded location information, record the host information into the above two host information tables. See the specific process figure 1 :

[0059] [1] Host A accesses the network in the mode of automatically obtaining an IP address, and sends out a DHCPDISCOVERY broadcast packet;

[0060] [2] Switch S1 receives the DHCPDISCOVERY broadcast packet, and since there is no matching flow entry, it generates a packet-in message and submits it to the controller;

[0061]...

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Abstract

The invention discloses a terminal equipment real-time connecting and disconnecting sensing method based on SDN. When a host computer is connected into the SDN, a broadcast packet is sent to a switch, the switch receives the broadcast packet and transmits the broadcast packet to a controller in the mode of packet-in events, the controller temporarily records position information of a source host computer after receiving the broadcast packet and initializes two host computer information tables, respectively, {IP: MAC, (DPID, PORT)}, and {(DPID, PORT): IP}; then, after the controller captures a DHCPACK information packet, the controller extracts IP address information and MAC address information in the DHCPACK information packet, combines the position information recorded temporarily in advance and records the host computer information onto the two main computer information tables; when the host computer is disconnected, the event of Port Status is triggered, the controller initially sends detection information to the position where the host computer is located, if the detection information is not responded within the required time, then the host computer is disconnected from the network, and corresponding items in the tables are deleted by the controller. The terminal equipment real-time connecting and disconnecting sensing method based on the SDN can sense disconnection of the host machine in real time, improves subsequent checking and use efficiency, and meanwhile overcomes the defect that host computer information tables need to be updated frequently in an existing controller.

Description

technical field [0001] The invention relates to Internet technology, in particular to a software-defined network-based terminal device real-time access and departure sensing method. Background technique [0002] With the rapid development of Internet technology and applications and the rapid growth of Internet users, the existing Internet based on TCP / IP has gradually exposed many incompatibility, mainly including poor scalability, weak dynamic continuity, low security controllability, and operational problems. high cost issues. In order to solve the above problems, Software-Defined Networking (SDN) emerged as the times require, and has become a very popular future network technology in recent years. It is a popular candidate network form for enterprise networks, campus networks, and data center networks. The core idea is to separate the data plane and the control plane, and use a remote controller to centrally manage and control the network. [0003] The controller is the...

Claims

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Application Information

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IPC IPC(8): H04L12/24H04L12/751H04L12/741H04L45/02H04L45/74
Inventor 黄韬魏亮王健刘江谢俊峰张敏生刘韵洁
Owner JIANGSU FUTURE NETWORKS INNOVATION
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