Method of forming correct forwarding table through periodic broadcasting or multicast of CPU (Central Processing Unit)

Abstract

The invention discloses a method of forming a correct forwarding table through periodic broadcasting or multicast of a CPU (Central Processing Unit). The method comprises the following steps that a CPU unit forms a forwarding table which is unidirectional to the CPU unit through periodic broadcasting or multicast, when a PC (Personal Computer) unit follows the correct forwarding table to transmit a data packet to the CPU unit, the CPU unit forms the correct forwarding table to the PC unit. According to the method, the correct forwarding table can be formed by a switch and the PC without adopting a manner of bidirectional broadcast, so that broadcast is unnecessary for switching, the CPU unit cannot receive the unnecessary broadcast, the CPU unit concentrates on the related functions and cannot waste on discarded broadcast packets, so that a high-performance CPU chip is not needed, and only the CPU chip with the common performance is adopted; through modifying a register, an MAC (Media Access Control) unit controls the broadcast flow direction, so that implementation is convenient and any function of the MAC unit cannot be affected.

Description

technical field [0001] The invention relates to the field of electronic communication equipment, in particular to a method for forming a correct forwarding table through periodic broadcast or multicast by a CPU. Background technique [0002] In Ethernet switches, routers, protocol converters and instrumentation devices, separate CPU units and MAC units are often used, and the two units are connected through the CPU-MAC interface, mainly in the form of MII interface, GMII interface or Ethernet interface. The function of the unit is to complete the forwarding of Ethernet packets, and the function of the CPU unit is to receive business Ethernet packets from the MII interface, GMII interface or Ethernet interface, and process them, and provide web configuration, telnet through MII interface, MII interface or Ethernet interface Configuration and other functions of this device, the CPU unit accepts unicast, multicast and other services, network management data packets, and also re...

AI Technical Summary

Problems solved by technology

[0003] Now the processing method for the broadcast packet is that the MAC unit does not restrict the broadcast packet sent to the CPU unit, and let the CPU handle it by itself; for the CPU unit, even if the received broadcast packet is useless, it must be processed and discarded

When a large number of broadcast packets impact the CPU unit, it often makes the CPU unit unable to process and discard them in time, so that a large amount of processing power of the CPU unit is consumed in such useless work, and normal processing has no chance to proceed. Nowadays, high performance is often used Even in the case of broadcast impact, the CPU chip can normally process discarded broadcast packets, so the actual high performance is prepared for useless broadcast impact, wasting resources