A loop detection method and device for the network device

Abstract

The invention discloses a loopback detection method, including: for each supported VLAN, the network equipment may respectively create the first loopback detection special message, after the first loopback detection special message for VLANs copied, sent through the port supporting this VLAN; when confirmed that the first port of the network equipment received the first loopback detection special message sent locally, then the first port presents the loopback, and specify the corresponding VLAN to this loopback; according to received second loopback detection special message on the first port, specify the type of loopback for the first port. The invention still discloses the equipment for starting the loopback detection method mentioned above. With the method and equipment in the invention, the loopback detection performance may be improved.

Description

technical field [0001] The invention relates to detection technology, in particular to a loopback detection method and equipment for network equipment. Background technique [0002] In various existing networking, due to configuration errors or network connection problems, forwarding loops often exist in the networking. If there is a forwarding loop in the network, after a network device such as network device 1 sends broadcast, multicast, unknown unicast and other messages, these messages may be forwarded by other network devices and then received by network device 1. The network device 1 will also retransmit the packets that have been sent by itself, and repeat the process, resulting in a large number of repeated forwarding, thereby causing consumption of resources and even paralysis of the network. [0003] There are two types of network loops. Figure 1a shows a single-port loop in a network loop, that is, a port of a network device receives a message sent by the port it...

AI Technical Summary

Problems solved by technology

However, the channel bandwidth between the switch processing unit and the forwarding unit is limited. In the case of many configurations above, it is easy to cause packet loss, thereby reducing the accuracy of loopback detection.

[0012] Furthermore, if you want to ensure that no packet loss occurs, you need to reduce the speed at which the upper-layer software sends the loopback detection special message, which will inevitably lead to a decrease in the detection speed

[0013] The above is the problem existing in the current loopback detection method by taking the detection of the layer 2 loop as an example. In fact, when detecting the loop of other layers (such as the layer 3 loop), the internal processing unit of the network device and The problem of channel bandwidth between forwarding units also causes packet loss in the above configurations.

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