Fault detection method, device, SDN controller and forwarding equipment

Abstract

The embodiment of the invention provides a fault detection method, a network route generation device, an SDN controller and forwarding equipment. The SDN controller sends a detection message to the forwarding device at least once. The detection message comprises a first interface identifier and an ARP request message. The destination IP address of the ARP request message is the IP address of the first opposite terminal interface corresponding to the first interface identifier. The detection message is used for controlling the forwarding device to send the ARP request message and sending the ARP request message to the SDN controller when receiving a corresponding ARP response message. For the ARP request message sent each time, if the corresponding ARP response message is not received, it is determined that a link between the first interface corresponding to the first interface identifier and the first opposite-end interface fails. Thus, whether the link between the first interface andthe first opposite end interface fails or not can be accurately determined. A judgment basis for path switching is provided when there are multiple paths for transmitting the service flow.

Description

technical field [0001] The present application relates to the technical field of network communication, in particular, to a fault detection method, device, SDN controller and forwarding equipment. Background technique [0002] Software Defined Network (SDN) is a new type of network architecture. Its core idea is to separate the control plane and forwarding plane of network devices, and centralize and flexibly control network traffic through the controller. For example, the controller can configure the interfaces (including the uplink interface and downlink interface) of the forwarding device on the forwarding path of the forwarding device in the SDN network into a monitorlink (monitoring link) group to realize the status of each interface of the forwarding device linkage. [0003] For example figure 1 As shown, forwarding device 1 in the SDN network can communicate with forwarding device 2 through path L1 and path L2, path L1 includes forwarding devices 3 and 5, and path L...

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Problems solved by technology

[0004] However, there are the following situations in practical applications: 1. Interface B is not directly connected to interface C of forwarding device 5, for example, there are other devices connected between them, such as figure 1 The Layer 2 switch shown; 2. Forwarding device 5 is unable to transmit packets on interface C due to optical module failure, chip failure or other configuration problems, but interface C is still in the up state; 3. Forwarding device 3 is due to configuration problems and so on, interface B cannot transmit packets, but interface B is still enabled

In cases 1 and 2, the state of interface C cannot be transmitted to interface B, and in case 3, the state of interface B cannot be transmitted to interface A or interface C

Then, when interface B or C fails, interface A will still be in the open state, so that forwarding device 1 cannot know the link failure between interface B and interface C, and cannot perform path switching in time, and will still send packets along path L1. text, resulting in packet loss

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