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LAN (local area network) side loop detection and control method of network access equipment

A technology of network access equipment and control methods, applied in the field of loop detection and control on the LAN side of network access equipment, capable of solving problems such as loop storms and affecting normal network communication

Inactive Publication Date: 2012-11-07
SHENZHEN GONGJIN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above two loop situations: if the data packet received from a certain port is not judged and there are no relevant measures to limit and prevent, the same data packet will be forwarded out through the previous method and way, and the result is The same data packet is received again from the same or different port, and such a cycle will cause a loop storm, affecting normal network communication

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  • LAN (local area network) side loop detection and control method of network access equipment

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Embodiment Construction

[0018] like figure 1 As shown, this embodiment is a method for detecting whether there is a loop on the LAN side in the network access device, and controlling the loop if it exists. The method is completed depending on specific Ethernet network protocol messages, platforms and supporting software program instructions. The loop detection and control program includes a network application layer sending message module and a network link layer loop detection and shielding module. Among them, the LAN side is the step of detecting and controlling the loop in the downstream direction of the device: during the hardware initialization process of the device, set the multiple network downstream ports of the device to the same MAC address, and then the network application layer program will generate specific MAC addresses with broadcast characteristics at specific intervals. After the loop detection message, it is sent out through each different network downlink port of the device.

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Abstract

The invention provides a LAN (local area network) side loop detection and control method of network access equipment. The method is finished dependently on a specific ethernet network protocol message and an operation system platform of supporting TCP / UDP (transmission control protocol / user datagram protocol) stack, and matched soft program instruction. Concrete content comprises the steps of system loading, script loading, equipment hardware initializing, software program initializing, loop detection process, loop discover process and control shielding loop process. The equipment hardware initializing process comprises the steps of setting the same MAC (media access control) address for a plurality of network downlink interfaces of the equipment, generating a specific loop probing message with broadcast characteristics by the network application layer program at an interval of specific time, and then transmitting the specific loop probing message via each different network downlink interface of the equipment.

Description

technical field [0001] The invention relates to the technical field of local area networks, in particular to a method for detecting and controlling loops on the LAN side of network access equipment. Background technique [0002] One side of the network access device is the WAN side, and the other side is the LAN side. It is the device that connects the LAN to the WAN. The WAN side of the network access device is the uplink side, the LAN side is the downlink side, and the port on the LAN side Called the downstream port. [0003] In the network topology composed of multiple network access devices of the user, once the downlink port is improperly connected, it is very easy to generate a loop between the devices. If the device is in a loop state, the message will continue to be received and forwarded in the device in a loop , which will inevitably lead to a loop storm, and once the loop storm is formed, the CPU of the device will be tired of receiving and forwarding data packet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26H04L12/56
Inventor 黎海文郭小东邓永坚王志波
Owner SHENZHEN GONGJIN ELECTRONICS CO LTD