DHCP (dynamic host configuration protocol) SNOOPING based three-layer switching device and DHCP SNOOPING based three-layer switching method

Abstract

The invention discloses a DHCP (dynamic host configuration protocol) SNOOPING based three-layer switching device and a DHCP SNOOPING based three-layer switching method. The device connected with a plurality of virtual local area networks comprises an enable module, a redirecting module, a central processing module, a storage module and a three-layer switching module, wherein the enable module is used for enabling configured DHCP SNOOPING, the redirecting module is used for redirecting network message requests transmitted to a source user terminal to the central processing module, the central processing module is used for judging legality of received network messages, processing the messages and creating a DHCP binding information table, the storage module is used for storing the DHCP binding information table, and the three-layer switching module is used for receiving the network messages transmitted by the source user, transmitting the messages to three-layer engines to process according to the DHCP binding information table, and forwarding the network messages subjected to three-layer engine processing to a target user terminal according to an target user terminal address. By means of the technical scheme, learning approaches of three-layer table entries of a switchboard in the DHCP environment are added, and stability and safety of the table entries are effectively guaranteed.

Description

technical field [0001] The present invention relates to the field of computer data communication, in particular to a three-layer switching device and method based on DHCP SNOOPING Background technique [0002] With the continuous improvement of switching technology in data communication, devices with layer-3 switching functions have been widely used. Layer-3 switching devices can forward IP packets across virtual LANs at wire speed, which is an advantage that layer-2 switching devices do not have. [0003] A layer-3 switch adds a layer-3 routing function to an ordinary switch, which is realized through the organic combination of a switch and a router. After the three-layer switch software routes the data flow received for the first time, it generates a mapping table between MAC address and IP address, and performs hardware caching. When the data flow with the same address information passes again, it can directly perform fast forwarding according to this table. , that is, "...

AI Technical Summary

Problems solved by technology

Due to the simplicity of the ARP protocol, it is extremely vulnerable to attacks and spoofing, and the host routing table entries generated by ARP also become unstable, which will cause abnormal forwarding of network traffic and bring great inconvenience to users.

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