Control method and control device for switching AP (Access Point) between hot standby ACs (Access Controllers)

Abstract

The invention discloses a control method and a control device for switching an AP (Access Point) between hot standby ACs (Access Controllers). According to the scheme provided by the invention, after a tunnel switching notice sent by a slave AC is received by the AP, the survival states of a master AC and the slave AC are judged by detecting the master AC and the slave AC; the switching is performed according to the tunnel switching notice of the slave AC only when the survival state of the master AC is abnormal, so that the error switching when the master AC is not in fault is avoided and the interruption of service data caused by the error switching is also avoided; if the time-sharing detection for each AP is realized by the master AC by detecting the configuration of all the APs, the influence of a large quantity of gusty detection messages on the master AC and the slave AC is avoided; and besides, the hot standby combination of each two ACs can be clearly appointed by an IP (Internet Protocol) address and an IP message serves as an interactive hopping detection message between each two hot standby ACs.

Description

technical field [0001] This application relates to AC (Access Controller, access controller) hot standby technology in WLAN (Wireless LAN, wireless local area network), especially relates to the control method and method for AP (Access Point, access point) switching between hot standby ACs control device. Background technique [0002] In existing WLAN applications, it is generally required that the WLAN can provide the AC hot backup capability. [0003] figure 1 It is a schematic diagram of a WLAN with AC hot backup capability in the prior art. Such as figure 1 As shown, there are usually multiple ACs in a WLAN, and any two ACs can be hot standby for each other ( figure 1 Only two ACs are used as an example). In addition, in each pair of ACs that are hot standby for each other, one acts as the master (Master) AC, and the other acts as the backup (Slave) AC. The master AC is responsible for forwarding the service data flow of each AP, and the backup AC passes the Exchan...

AI Technical Summary

Problems solved by technology

[0006] 1. Mishandling is prone to occur: When the heartbeat detection message from the primary AC has not been received for a long time, the backup AC will conclude that the primary AC has failed. However, in addition to the failure of the primary AC, the heartbeat detection message Failure of the transmission link of the primary AC will also cause the backup AC to be unable to receive heartbeat detection packets from the primary AC for a long time. Therefore, the backup AC may incorrectly send a tunnel switching notification to the AP when Switching is performed when the main AC does not fail, so that unnecessary interruption of business data flow occurs due to wrong switching;

[0007] 2. The hot standby combination of every two ACs needs to be specified by configuring VLAN (Virtual LAN, virtual local area network) and Domain (domain). However, only two ACs are allowed to be designated as hot standby in the same VLAN and Domain, so When there are more than two ACs in the WLAN and need to form different hot standby combinations, it is difficult to specify;

[0008] 3. The heartbeat detection message is a layer 2 message, which makes the heartbeat detection easy to be attacked and cannot meet the application across the three layers

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