A real-time access and departure sensing method for terminal equipment 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: 2016-06-29
JIANGSU FUTURE NETWORKS INNOVATION +1
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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
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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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The invention discloses an SDN-based real-time access and departure sensing method for terminal equipment. When a host accesses an SDN network, it sends a broadcast packet to a switch, and the switch receives the broadcast packet and sends the broadcast packet in the form of a packet-in event. Pass it to the controller, the controller temporarily records the location information of the source host after receiving it, and initializes two host information tables, which are respectively {IP:MAC,(DPID,PORT)} and {(DPID,PORT):IP}; after that After the controller intercepts the DHCPACK information packet, it extracts the IP address and MAC address information, and combines the previously recorded location information to record the host information in the above two host information tables, and triggers the PortStatus event when the host leaves , the controller actively sends detection information to the location of the host, if there is no response within the specified time, it means that the host has left the network, and the controller deletes the corresponding entry in the table. The invention increases the real-time perception of the departure of the host, improves the efficiency of subsequent search, and simultaneously solves the disadvantage of frequently updating the host information table of the 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) came into being 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. Its core The 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 core of t...
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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
OwnerJIANGSU FUTURE NETWORKS INNOVATION