Table item adjustment method, device and switching equipment

Abstract

The present invention provides an entry adjustment method, device, and switching equipment. The entry adjustment method includes: obtaining the destination IP address of the message to be sent to the CPU; if the above destination IP address belongs to the local directly connected network segment, then determine the above The rate of packets to be sent to the CPU corresponding to the directly connected network segment to which the destination IP address belongs; if the rate of packets to be sent to the CPU corresponding to the directly connected network segment to which the destination IP address belongs is greater than the preset rate threshold, and the routing table If the item is currently installed in the network routing table, move the routing table entry corresponding to the directly connected network segment to which the above destination IP address belongs from the network routing table to the FFP table, and set the corresponding The maximum rate at which packets of routing table entries are sent to the CPU. In this way, the packet rate sent to the CPU can be controlled to ensure that the CPU can bear it, thereby ensuring the ARP passthrough performance under the line-speed traffic pressure scenario.

Description

Technical field [0001] The present invention relates to network and data communication technology, in particular to an entry adjustment method, device and switching equipment, belonging to the field of communication technology. Background technique [0002] From the perspective of the forwarding model, the three-layer switch is usually divided into two levels: the control plane and the forwarding plane. The control plane is composed of a central processing unit (Central Processing Unit; hereinafter referred to as: CPU) and some protocol entities, while the forwarding plane is mainly composed of dedicated Integrated circuit (ApplicationSpecificIntegratedCircuit; hereinafter referred to as: ASIC) exchange chip composition. Among them, the control plane is responsible for protocol interaction, and the forwarding plane is responsible for wire-speed forwarding of messages. The control plane is a software behavior that requires CPU resources to analyze and process messages; the forwar...

AI Technical Summary

Problems solved by technology

However, the problem with this solution is that if the range of the network segment is too large, the amount of ARP request packets actively sent will be very large. For example, if the interface IP address is configured as 1.1.1.1 / 8, then the local direct connection The network segment is 1.0.0.0 / 8, and the number of hosts that may exist in this network segment reaches 2 to the 24th power, that is, tens of millions. To send so many ARP requests, it is obviously not worth the candle, and it will cause CPU paralysis

[0020] 2) Suppress a large number of IP packets from being sent to the CPU: As mentioned above, once a large number of IP packets that cannot be processed are sent to the CPU for processing on the forwarding plane, the CPU utilization rate will soar, or even be paralyzed, resulting in a sudden drop in ARP communication performance

However, although this solution protects the CPU, it also discards the IP packets that should be sent to the CPU for processing (that is, prohibiting sending to the CPU), which does not have much effect on ensuring the performance of ARP connectivity.

[0021] To sum up, the existing technical solutions cannot guarantee the performance of ARP opening under the line-speed traffic pressure scenario

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