The learning method and device of the arp table and the three-layer network equipment

Abstract

The invention provides an ARP (Address Resolution Protocol) table learning method and device and a piece of network three-layer equipment. The method comprises the following steps: if that the interface of network three-layer equipment receives a to-be-sent service message and the target IP address of the service message is not found in the ARP table of the interface is detected, modifying and disguising the service message as an ARP request message, and broadcasting the ARP request message through a source port corresponding to the interface; receiving an ARP reply message; and updating the ARP table of the interface of the network three-layer equipment according to the corresponding relationship between the source IP address and the source MAC address in the ARP reply message. The problem of large overhead caused by the fact that message forwarding is interrupted too long and a protocol stack of a host receives too many messages under the condition that the ARP table of the interfaceof the network three-layer equipment is aged but the ARP table of the protocol stack of the host is not aged in the prior art can be solved. The interruption time of message forwarding can be shortened and become negligible. The ARP table of the protocol stack and the ARP table of the interface can be synchronized quickly, and the overhead of the protocol stack can be reduced.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an ARP table learning method, device and network three-layer equipment. Background technique [0002] In the networking of Layer 3 routing devices, in order to improve performance and reliability, the Address Resolution Protocol (Address Resolution Protocol, referred to as ARP) table of the interface of the Layer 3 device and the ARP table of the host protocol stack are generally maintained independently. , so that there will be inconsistencies between the two ARP tables when the device is running. This kind of inconsistency is basically the inconsistency of the ARP tables caused by the ARP aging reset to zero. [0003] At present, common practices in the industry include: 1. If the ARP table of the host protocol stack is aged and lost, the host protocol stack will immediately initiate standard ARP protocol process re-learning and update the ARP table when processing relat...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present invention provides a learning method, device and network three-layer equipment of an ARP table, which can solve the problem that the ARP table of the network three-layer equipment interface in the prior art is aged, and the ARP table of the host protocol stack When the message is not aged out, the message forwarding may be interrupted for too long and the host protocol stack receives too many messages, resulting in excessive overhead.

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