Method and device for learning address resolution protocol table entries and network device

Abstract

The embodiment of the invention provides a method and a device for learning address resolution protocol table entries and a network device. The method includes the steps of: judging whether an IP (Internet Protocol) address carried in an ARP (Address Resolution Protocol) message is stored in a while list, wherein IP addresses which can perform learning of the ARP table entries are stored in the white list; if the IP address is stored in the white list, performing ARP table entries on the IP address to learn a MAC (Media Access Control) address corresponding to the IP table entries. During the process, through judging whether the IP address carried in the ARP message is stored in the while list, the learning of ARP table entries is only performed on the IP address in the white list, ARP table entry resources are prevented from being exhausted by limiting the learning range of the ARP table entries, and thereby the service quality is ensured.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a method, device and network equipment for learning address resolution protocol entries. Background technique [0002] At present, when using the Internet Protocol (IP) in Ethernet, the sender needs to learn the Address Resolution Protocol (ARP) table entry, that is, the sender needs to obtain the media access of the receiver according to the IP address mapping of the receiver. Control (Media Access Control, MAC) address, and then encapsulate the IP datagram into a frame for transmission. Wherein, the corresponding relationship between the IP address and the MAC address is called an ARP entry. [0003] In the prior art, there are two ways of learning ARP entries: non-strict learning or non-strict learning. In the non-strict learning mode, the sender carries its own ARP entry and the IP address of the receiver in the ARP request and broadcasts it to other n...

AI Technical Summary

Problems solved by technology

However, in a complex network environment, when a network device receives a large number of ARP response attack packets whose destination address is the network device, or a large number of attack IP packets need to be forwarded through the network device at Layer 3, the network device actively sends A large number of ARP requests cause the network device to learn a large number of unnecessary ARP entries

[0004] However, because the number of ARP entries that can be stored in the ARP table of each network device is limited, when the number of stored ARP entries reaches the maximum specification that the ARP table can support, the ARP entry resources will be exhausted, and subsequent operations will fail. The learned ARP entries cause the interruption of data transmission, which cannot guarantee the service quality

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