Wireless controller heat backup switching method, wireless controller heat backup switching device and wireless controller

Abstract

The invention discloses a wireless controller heat backup switching method, a wireless controller heat backup switching device and a wireless controller which are used for enhancing the robustness of a wireless network and reducing the waste of network resources, wherein the wireless controller heat backup switching method comprises the following steps that the initial number of initial on-line access points (APs) is counted; whether a CAPWAP tunnel between the AP is abnormal or not is respectively judged for each on-line AP; every time when the condition that the CAPWAP tunnel between any one on-line AP is abnormal is judged, the number of the current on-line APs is subtracted by 1, and the initial value of the number of the current on-line APs is the counted initial number of the initial on-line APs; and when the number of the current on-line APs meets a preset switching condition, heat backup switching is triggered.

Description

Technical field [0001] The invention relates to the technical field of wireless local area networks, in particular to design a wireless controller hot standby switching method, device and wireless controller. Background technique [0002] In the deployment of Wireless Local Area Networks (WLAN, Wireless Local Area Networks), there are currently two deployment methods: thin wireless access point (AP, Access Point) mode and fat AP mode. Among them, the thin AP mode has gradually become the mainstream deployment method. In the deployment of the thin AP mode, two types of wireless devices are involved: AC (Access Controller) and AP. Among them, AP is a bridge connecting wired and wireless networks, and its role is to connect each wireless client (also known as STA or Station), for example, the wireless client can be a laptop (PC), PDA, or wireless network card that supports WLAN access function, and then connect the wireless network to the wired network, and the AP connects to the A...

AI Technical Summary

Problems solved by technology

[0005] However, in practical applications, the following scenarios are more common: the master AC is running normally, that is, it sends keep-alive messages with the slave AC, but the master CAPWAP tunnel between the AP and the master AC fails. The 802.11 module of the AC detects that the primary CAPWAP tunnel is disconnected, and the wireless client associated with the AP is offline. The primary AC will synchronize the wireless client offline information to the secondary AC through the keep-alive channel. The keep-alive channels between the CAPWAP tunnel and the two ACs belong to different virtual local area networks (VLANs), and they are independent. Therefore, the keep-alive channel between the master AC and the slave AC still sends keep-alive messages normally. , the following problems will arise: for the AP, there is only one slave CAPWAP tunnel to the slave AC, but for the slave AC, since the keep-alive channel between the master AC and the slave AC normally sends keep-alive messages, it cannot trigger The hot standby switching function of the AC keeps the master-slave relationship between the two unchanged, and the slave CAPWAP tunnel will not process any packets sent from the wireless client. Therefore, when the master CAPWAP tunnel is disconnected, the wireless client will not be able to communicate with the external Network communication affects the robustness of the wireless network; at the same time, although the current secondary CAPWAP tunnel is in a normal connection state, it cannot be used to transmit packets, resulting in a waste of network resources

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