Method and device for realizing address resolution protocol (ARP) interception

Abstract

The invention provides a method and a device for realizing address resolution protocol (ARP) interception. The ARP information sharing of a site network can be realized by utilizing any bearing message such as an intermediate system to intermediate system (ISIS) protocol message, so that the number of ARP request messages broadcast in a core network can be effectively suppressed. Moreover, an edge device of each site network can intercept the ARP information of a remote host from the bearing message, and simultaneously learn the media access control (MAC) information of the remote host so as to learn the MAC information of the remote host as early as possible to avoid the condition that the edge device not timely learning the MAC information of the remote host discards an ARP response message returned by the remote host and further avoid the repeated broadcasting of an ARP request message corresponding to the ARP response message which cannot be returned in the core network.

Description

technical field [0001] The present invention relates to ARP (Address Resolution Protocol, Address Resolution Protocol) technology, in particular to a method and device for realizing ARP interception. Background technique [0002] In order to realize remote interconnection of multiple data centers, an EVI (Ethernet Virtualization Interconnection, Ethernet Virtualization Interconnection) solution is proposed in the prior art. [0003] In the EVI solution, each data center forms a local site network (or private network), and each site network realizes Layer 2 interconnection through a core network (or public network). figure 1 The networking mode of the EVI solution is shown by taking site networks 1 to 3 interconnected through the core network as an example. [0004] Moreover, each site network has an ED (Edge Device, edge device), and the ED in each site network is used to realize the forwarding of messages from the site network to the core network and from the core network ...

AI Technical Summary

Problems solved by technology

Then, for each site network, when the Host in the local site network responds with an ARP response message to the Host at the source end of the ARP request message, if the ED of the local site network fails to learn the The MAC information of the Host at the source end of the ARP Request message will discard the ARP Reply message. In this way, the Host at the source end of the ARP Request message will send the ARP message again because it has not received the ARP Reply message for a long time. request message, and broadcast it again in the core network, which will increase the number of ARP request messages broadcast in the core network due to repeated broadcasting

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