Congestion control method, device and equipment

Abstract

Disclosed are a congestion control method, apparatus and device, which belong to the technical field of communications. The method comprises: when it is detected that congestion occurs in a switching device, acquiring a first packet from a receiving cache of the switching device; when a source MAC address of the first packet is a MAC address of a gateway device, acquiring a source IP address of the first packet; when the source IP address is not an IP address of the gateway device, generating a first congestion control message according to the source IP address of the first packet, wherein the first congestion control message comprises the MAC address of the gateway device, a MAC address of the switching device and the source IP address of the first packet; and sending the first congestion control message to the gateway device. The present invention realizes congestion control of a three-layer SAN, thereby preventing the three-layer SAN from generating phenomena such as packet loss or non-order-preserving of packets, etc.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a congestion control method, device and equipment. Background technique [0002] Storage Area Network (English: Storage Area Network, abbreviation: SAN) network is a high-speed network. Since SAN mainly provides data transmission between computers and storage devices, it is very sensitive to packet loss and requires packets to be in order during transmission. [0003] In order to avoid packet loss, SAN provides a congestion notification mechanism, that is, Quantized Congestion Notification (English: Quantized Congestion Notification, abbreviation: QCN). One or several packets, informing the upstream device to stop sending the data flow to which the packet belongs until the congestion is relieved. [0004] figure 1 is a schematic diagram of the working principle of the QCN technique. see figure 1 , Server 1 and Server 2 send traffic to Server 3 through the SAN....

AI Technical Summary

Problems solved by technology

[0006] Since the QCN message is a Layer 2 message, its destination MAC address identifies the source device that causes traffic congestion, so the QCN message can only be sent to devices in the same Layer 2 network.

When the traffic causing congestion comes from a layer-3 network, the QCN message is sent to the gateway device connected to the switching device, but the gateway device is not the real source device sending the traffic causing congestion, so the QCN message cannot reach the source device, unable to perform congestion control

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