Message forwarding method and system

Abstract

The invention provides a message forwarding method and system. The method is applied to a switch, and comprises the following steps: a switch chip receives a message to be forwarded; after determining that a target ARP table item corresponding to the message to be forwarded is not stored in an ARP table, a CPU acquires the target ARP table item, associates a priority identifier for the target ARP table item, and issues the target ARP table item to a switch chip ARP table; when ARP storage resources in the switch chip ARP table are exhausted and the target ARP table item is associated with a high priority identifier, the CPU replaces any ARP table item that is associated with a normal priority identifier in the switch chip ARP table as the target ARP table item; and the switch chip forwards the message to be forwarded according to the target ARP table item. By adopting the message forwarding method and system provided by the invention, the ARP table items of the switch chip are associated with different priority identifiers, the ARP table items with low priority are replaced by the ARP table items with high priority, and thus the switch chip can store the three layers of forwarded ARP table items when the ARP storage resources are exhausted, and network delay or interruption caused by excessive usage of the CPU when forwarding the three layers of messages can be avoided.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular to a method and system for message forwarding. Background technique [0002] In network communication, ARP (Address Resolution Protocol, Address Resolution Protocol) is a TCP / IP protocol for obtaining a MAC (Media Access Control, Media Access Control) address according to an IP address. When a switch forwards a packet, its CPU needs to first look up the next-hop IP address and outbound interface information of the packet to be forwarded according to the routing table, and then obtain its corresponding MAC address according to the next-hop IP address and ARP information to complete the packet. Text forwarding. [0003] In the prior art, the switch CPU usually saves the MAC address obtained according to the next-hop IP address when forwarding the message, generates an ARP table according to the correspondence between the IP address and the MAC address and the out...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a method and system for message forwarding, which are used to solve the problem of network delay or interruption caused when the three-layer forwarding ARP entry cannot be delivered to the switching chip in the existing message forwarding technology

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