Method and device for self adaptive quick loop detection and loop blocking

Abstract

The invention involves a method and a device for adaptively fast detecting loop circuit and interdiction, in which, the key is continuous detection whether to receive its own data packets sent to the Ethernet in each port. If the data packet is detected, it will be discarded and the port is set to obstruction state for blocking the loop circuit, limiting the broadcast and proliferation of broadcasting storm in the Ethernet, and avoiding influence to the other normal data operations. In the invention, there is no CPU, the visit to source MAC address of control layer and a 12-bit VLAN ID logo by medium of 48-bit Ethernet frames sent and received on the port, as a key information, its logic operation, learning, searching, comparison and so on, enhance adaptability and speed of loop detection and prevention, without occupying network bandwidth and effecting the normal network data transmission.

Description

technical field [0001] The invention relates to the technical field of Ethernet loop detection and blocking, in particular to a method and device for self-adaptive fast loop detection and loop blocking. Background technique [0002] With the development of LAN, more and more users access the network through Ethernet switches. The problem that often occurs when installing LAN is mainly that the network forms a loop. In some cases, a wrong connection of a cable can cause the entire network to fail. paralysis, such as Figure 1a and Figure 1b In the situation shown, there is a self-loop head on an Ethernet switch, or there is a self-loop head or a loop on the Ethernet switch or bridge connected to the Ethernet switching cascade. In the above two networking situations, there is a possibility that the PC cannot communicate with the server normally. exist Figure 1a In this case, when the PC communicates with the server, it will initially send an ARP broadcast message. After re...

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Problems solved by technology

[0003] From the above analysis of the loopback process based on CPU sending and receiving messages to detect whether there is a loopback in the network, it can be seen that its biggest disadvantage is that in order to detect loopbacks in the Layer 2 network, a CPU needs to be added to the device. For enterprises, it is indeed daunting and may be costly. At the same time, a detection is performed at a certain time interval to send and receive reports on each port to determine whether there is a loopback on each port. This will occupy a certain bandwidth of each port and will Affect some normal data flow

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