Flow switching method, device and system

Abstract

The invention discloses a flow switching method, a device and a system. The method comprises the following steps: an SDN controller obtaining a first state of a target gateway, wherein the target gateway belongs to an SDN gateway group, multiple forwarding paths where multiple gateways in the SDN gateway group are disposed form multiple equivalent paths between a first network node and a second network node; and the SDN controller, according to the first state, sending an ARP item to the target gateway and modifying a measurement value of a forwarding path where the target gateway is disposed in the multiple equivalent paths into a first value from an original value, wherein the first value is greater than the original value. According to the scheme, through increasing the measurement value of a forwarding path where a fault gateway is disposed, the routing priority of the forwarding path is reduced, such that a flow is prevented from being routed to the fault gateway through the multiple equivalent paths, data loss is prevented, and other service functions of the fault gateway are not affected in the process of sending the ARP item.

Description

technical field [0001] The present invention relates to the field of network technology, in particular to a traffic switching method, device and system. Background technique [0002] Network overlay (Overlay) is the mainstream architecture model of Software Defined Network (SDN), which can realize the decoupling of network services from the underlying physical network devices, thereby creating a flexible virtual network. [0003] In order to improve the reliability of message transmission, network nodes in the Overlay architecture forward messages through multi-active gateways (multiple gateways sharing the same network address), and the forwarding paths of each gateway in the multi-active gateway form a network Equal-Cost Multi-Path (ECMP) between nodes. [0004] When a gateway in the all-active gateway restarts due to a fault, the SDN controller needs to send the ARP entries on the SDN controller to the faulty gateway in batches to ensure the consistency of the ARP entrie...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a traffic switching method, device and system, which solves the problem of data loss caused by being routed to the gateway through equal-cost multipath when the ARP entry on the faulty gateway is incomplete, and can realize In the process of sending ARP entries, it does not affect other business functions of the gateway

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