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

A tunnel connection and tunnel technology, applied in the field of communication, can solve problems such as EchoRequest message retransmission, Capwap tunnel disconnection, Capwap data channel disconnection, etc., to improve reliability and stability, ensure stability and reliability, The effect of increasing the maximum number of retransmissions

Active Publication Date: 2015-06-17
RUIJIE NETWORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 of the present invention provides a Capwap tunnel connection control method, the step flow of the method can be as follows figure 2 shown, including:

[0036] Step 101. Determine whether a packet retransmission is successful.

[0037] In this embodiment, when the access controller AC performs a round of Echo Request message retransmission on the control channel of the Capwap tunnel, it can adjust the maximum number of retransmissions respectively according to the success or failure of a message retransmission, so , in this step, it can be determined whether a packet retransmission is successful.

[0038] Specifically, if a message is retransmitted successfully, it can be understood that the AC dispatches an Echo Response message after retransmitting the message. If the packet retransmission failed this time, it can be understood that the AC did not schedule the Echo Response packet after the packet retransmission this time.

[0039] This step specifical...

Embodiment 2

[0063]Preferably, the first threshold value and the second threshold value involved in Embodiment 1 can be set as dynamically changing values ​​according to the current maximum number of retransmissions, and each time the maximum number of retransmissions is increased or decreased The magnitude of can also be set, for example, set according to the current maximum number of retransmissions. For example, the first threshold value can be set as a value obtained by rounding up two-thirds of the current maximum number of retransmissions (for example, the current maximum number of retransmissions is 5, and two-thirds of the current maximum number of retransmissions is upwards When the value obtained by rounding is 4), the increased maximum retransmission times can be the value obtained by rounding up to four-thirds of the current maximum retransmission times (for example, the current maximum retransmission times are 5, and the current maximum retransmission times Four-thirds of the ...

Embodiment 3

[0072] Embodiment 3 of the present invention provides a Capwap tunnel connection control method, the step flow of the method can be as follows image 3 shown, including:

[0073] Step 201, initialize the maximum number of retransmissions.

[0074] In this embodiment, the maximum number of retransmissions is 5 times stipulated in the existing protocol as an example for illustration.

[0075] Step 202, determine that the Capwap tunnel enters the normal operation state.

[0076] Step 203, determine whether a round of packet retransmission occurs.

[0077] For each round of packet retransmission, the number of packet retransmissions (which can be represented by Count) can be initialized, and the initialization value can be 0, that is, N-1 indicates that the number of packet retransmissions is N. It can be understood that every time a packet is retransmitted, the number of packet retransmissions is increased by 1.

[0078] And in this embodiment, if the normal operation time of...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/02H04W84/12
Inventor 张百锐
Owner RUIJIE NETWORKS CO LTD
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