Method and device for controlling connection of control and provisioning of wireless access points (Capwap) tunnel

Abstract

The embodiment of the invention provides a method and a device for controlling connection of a control and provisioning of wireless access points (Capwap) tunnel. The method comprises the following steps of: when an access controller (AC) retransmits a round of Echo Request message, if the message is not successfully retransmitted, judging whether the utilization rate of a central processing unit (CPU) of the AC is greater than a preset threshold value or whether a data channel of the Capwap tunnel works normally; and if the utilization rate of the CPU of the AC is greater than the preset threshold value, or the data channel of the Capwap tunnel works normally, increasing the maximum retransmission times of an Echo Request message, and continuously retransmitting the message according to a regulated maximum retransmission times. According to the method and the device, when the utilization rate of the CPU of the AC is greater or single threaded apartment (STA) data traffic is relatively high, the data channel works normally, and the Echo Request message cannot be normally scheduled in a control channel, the connection of the Capwap tunnel can be maintained to the maximum extent, the reliability and stability of the connection of the Capwap tunnel can be improved, and the stability and reliability of a wireless local area network (WLAN) service can be ensured.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for controlling and provisioning a wireless access point (AP) tunnel connection (Capwap, Control And Provisioning of Wireless Access Points). Background technique [0002] With the continuous improvement of wireless local area network (WLAN) access speed, WLAN is not only a supplement to wired network, but is gradually developing towards large-scale deployment and independent networking. The traditional WLAN architecture can no longer meet the needs of large-scale networking. Therefore, the Internet Engineering Task Force (IETF) established the Capwap working group to study large-scale WLAN solutions. [0003] The Capwap protocol is based on a centralized WLAN architecture, and the access controller (AC) and access point (AP) are connected through an Internet Protocol (IP) network. After the AC establishes a Capwap connection with the AP, a Capwap communicat...

AI Technical Summary

Problems solved by technology

[0010] When the network is abnormal, for example, the central processing unit (CPU) utilization rate of the AC is high, and the data flow of the STA is too large, etc., it is very likely that the Echo Response packets cannot be scheduled in time on the AC. Cause retransmission of Echo Request message

The number of retransmissions stipulated in the standard is only 5 times. After the Echo Request message is retransmitted 5 times, taking the periodic interval of sending the Echo Request message as 30s as an example, that is, after 81s, the AC may still not be able to schedule the Echo Response message. text, so the Capwap tunnel is disconnected after 5 failed retransmissions

If the Capwap tunnel is disconnected, the Capwap data channel will be disconnected, and the data packets from the STA to the AC will be discarded. However, before the Capwap tunnel is disconnected, the data flow from the STA to the AC may always be normal, that is, the Capwap data The channel is normal, but the Capwap data channel is disconnected only due to the disconnection of the Capwap control channel, which affects the stability and reliability of the WLAN business

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