WO2011140879A1

WO2011140879A1 - Method, device and system for processing service message in wireless local area network

Info

Publication number: WO2011140879A1
Application number: PCT/CN2011/072757
Authority: WO
Inventors: 赵望生; 颜林志; 李思行; 薛保华
Original assignee: 华为技术有限公司
Priority date: 2010-08-12
Filing date: 2011-04-14
Publication date: 2011-11-17
Also published as: CN102143045A; CN102143045B

Abstract

A method, device and system for processing service messages in a Wireless Local Area Network (WLAN) are disclosed in the embodiments of the present invention. The WLAN includes an Access Point (AP), a first Access Controller (AC) and a second AC, wherein the first AC is connected with the AP and the second AC respectively. The method includes: receiving a service message of the Control and Provisioning of Wireless Access Points (CAPWAP) from the AP; obtaining, according to a preset distribution strategy, identification information from the service message of the CAPWAP; according to the relation between the identification information and the AC, obtaining the AC corresponding to the identification information; transmitting the service message of the CAPWAP to the corresponding AC, so that the service message of the CAPWAP is decapsulated by the corresponding AC. The embodiments of the present invention can enable multiple ACs to manage APs in the wireless local area network, thereby ensuring the normal performance of the service of the APs in the wireless local area network.

Description

Method, device and system for processing service messages in WLANs This application claims to be filed on August 12, 2010 with the Chinese Patent Office, application number 201010253529.6, and the invention name is "processing method, device and system for service packets in WLAN" The priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

The embodiments of the present invention relate to a communication technology, and in particular, to a method, a device, and a system for processing a service packet in a wireless local area network (WLAN).

Background technique

A wireless local area network (WLAN) is mainly composed of an Access Controller (AC) and an Access Point (AP). An AC can manage multiple APs, that is, a Control and Provisioning of Wireless Access Points (CAPWAP) tunnel can be established with multiple APs. As the number of APs increases, the tunnel resources of a single AC are insufficient. A single AC cannot manage them. As a result, the services of APs in the WLAN cannot be performed normally.

Summary of the invention

An embodiment of the present invention provides a method for processing a service packet in a wireless local area network, where the WLAN includes an access point AP, a first access controller AC, and a second AC, where the first AC and the AP are respectively The second AC is connected, the method includes: receiving a control of a wireless access point from the AP, and configuring a CAPWAP service packet; acquiring the identification information from the CAPWAP service packet according to the preset distribution policy, according to the identifier Corresponding to the AC, the AC corresponding to the identifier information is obtained, and the CAPWAP service packet is sent to the corresponding AC, so that the corresponding AC decapsulates the CAPWAP service packet. The embodiment of the invention further provides a processing device for processing a service packet in a wireless local area network, The WLAN further includes an access point AP and at least one access controller AC, and the processing device is respectively connected to the AP and the at least one AC, and the processing device includes:

a packet obtaining module, configured to acquire a control of a wireless access point from the AP and configure a CAPWAP service message;

The information obtaining module is configured to obtain the identification information from the CAPWAP service packet according to the preset distribution policy, and obtain the AC corresponding to the identifier information according to the correspondence between the identifier information and the AC;

And a packet processing module, configured to send the CAPWAP service packet to the corresponding AC, so that the corresponding AC decapsulates the CAPWAP service packet.

The embodiment of the present invention further provides a processing system for a service packet in a wireless local area network, including an access point AP, a first access controller AC, and a second AC, where the first AC and the AP and the The second AC is connected, wherein

The first AC is configured to receive the control of the wireless access point from the AP and configure the CAPWAP service packet. The identifier information is obtained from the CAPWAP service packet according to the preset distribution policy, and the identifier information is obtained according to the identifier information. Corresponding to the AC, the AC corresponding to the identifier information is sent, and the CAPWAP service packet is sent to the corresponding AC, so that the corresponding AC decapsulates the CAPWAP service packet.

The embodiment of the present invention can obtain the identification information from the obtained CAPWAP service packet according to the pre-set distribution policy, and then obtain the AC corresponding to the identifier information according to the correspondence between the identifier information and the AC, so that the AC can be redirected. The CAPWAP service packet is sent to the corresponding AC, so that the CAPWAP service packet of the corresponding AC is decapsulated, and the APs in the WLAN can be managed by multiple ACs, thereby ensuring normal AP services in the WLAN. get on. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. The drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work. 1 is a network architecture diagram of a wireless local area network in the prior art; FIG. 2 is a network architecture diagram of a wireless local area network based on an embodiment of the present invention; FIG. 3 is a network architecture diagram of another wireless local area network based on an embodiment of the present invention; 4 is a schematic flowchart of a method for processing a service packet in a wireless local area network according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a device for processing a service packet in a wireless local area network according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a system for processing a service packet in a wireless local area network according to an embodiment of the present invention.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention. In the prior art, at least one AP can be connected through a switching device in an AC. As shown in FIG. 1 , these APs can also connect to a Broadband Remote Access Server (BRAS) through a switching device. As the number of APs connected under the AC increases, resulting in a single There is not enough AC tunnel resources, so you need to expand the capacity of the AC. In view of this, an embodiment of the present invention expands the AC. As shown in FIG. 2, an AC22 is extended on the basis of the AC20. Here, the AC20 and the AC22 may be two independent devices, or may be in the frame of one device. The two boards can also be two CAPWAP processing units on a single board. Of course, you can also connect multiple ACs at AC20 to form an AC array, as shown in Figure 3. A person skilled in the art can know that the APs in FIG. 2 and FIG. 3 can also be directly connected to the AC without using a switching device, where the switching device can be a switching device or a router.

Correspondingly, an embodiment of the present invention provides a method for processing a service packet in a wireless local area network. To make the method provided in this embodiment more clear, the architecture of FIG. 3 will be taken as an example. FIG. 4 is a schematic flowchart of a method for processing a service packet in a WLAN according to an embodiment of the present invention, which may include the following steps:

Step 101: The first AC acquires a CAPWAP service packet from the AP.

The first AC may be AC20 in Figure 3, or even a separate device, which may be in the middle of switching device 24 and AC20 (not shown in Figure 3).

Before this step, it also includes: AP pre-designated IP address or media access control to the network (Media

The device registration corresponding to the Access Control, abbreviated as MAC address, is exemplified by the IP address in the following embodiments. The device corresponding to the IP address here can be a standalone device, such as AC20. In this embodiment, the IP addresses registered by each AP are the same, so that each AP registers with the same device. Specifically, after the device corresponding to the IP address (for example, the AC 20) obtains the CAPWAP registration message from the AP, the device obtains the identification information from the CAPWAP registration message according to the preset distribution policy, and then the correspondence between the identification information and the AC is obtained. The CAPWAP tunnel entry corresponding to the AP is configured on the AC, and the CAPWAP tunnel table is configured on the AC. The entry may include a source MAC address, a destination MAC address, a virtual local area network (VLAN), a source IP address, a destination IP address, a User Datagram Protocol (UDP) source port number, and a UDP destination port. A combination of one or more of the numbers.

Since the AP only knows the IP address of a device (such as AC20), you do not need to select the AC to register. You only need to register the device corresponding to the above IP address (such as AC20), which reduces the complexity of the registration operation and improves the registration. s efficiency. Further, the CAPWAP tunnel entry corresponding to each AP can be configured on the AC corresponding to each AP by the device corresponding to the IP address (such as AC20), which reduces the complexity of the management operation.

In this step, the destination address of the CAPWAP service packet is the IP address of the device that is registered by the AP. Therefore, the destination address in the CAPWAP service packet of each AP is the same, that is, the pre-specified IP address.

Step 102: The first AC obtains the identifier information from the CAPWAP service packet according to the preset distribution policy, and learns the AC corresponding to the identifier information according to the correspondence between the identifier information and the AC.

The foregoing preset distribution policy may be that the existing field in the CAPWAP service packet is used as the identification information, for example, a combination of one or more of a source port number, a source IP address, a radio frequency MAC address, and wireless specific information. It can also be an extended field in a CAPWAP service message. Save the correspondence between the identification information and the AC locally.

Specifically, the AC corresponding to the identifier information may be included in the following manner according to the correspondence between the identifier information and the AC:

When the identification information uses the source port number, if there are 4 ACs in the system that can provide monthly services, you can The above four AC sequence numbers are 0 to 4 corresponding to AC20 to AC23 in the figure. After receiving the CAPWAP service packet, obtain the source port number included in the packet, and divide the source port number by 4, where the remainder is the AC that needs to process the CAPWAP service packet; or the number below 2000 is 0. The AC is treated by AC20, 2000 ~ 2999 is processed by AC numbered 1 or AC21, 3000 ~ 3999 is processed by AC number 2, that is, AC22, and 4000 or more is handled by AC, number 3, AC23.

When the source IP address is used as the source IP address, the number of the last IP address of the source IP address is divided by 4. The remainder is the AC that needs to process the CAPWAP service packet.

When the identification information uses the radio frequency MAC address, the number of the radio frequency MAC address can be divided by 4, and the remainder is the AC that needs to process the CAPWAP service packet.

When the identification information uses wireless specific information, the number of bits of the wireless specific information may be divided by 4, and the remainder is the AC that needs to process the CAPWAP service message.

It should be noted that, in this embodiment, the mapping relationship may be configured according to other rules, which is not limited in the embodiment of the present invention.

Step 103: The first AC sends the CAPWAP service packet to the corresponding AC, so that the corresponding AC decapsulates the CAPWAP service packet.

The AC (second AC) for decapsulating the CAPWAP service packet in this embodiment may be AC22 or the like. Specifically, the corresponding AC may decapsulate the CAPWAP service packet according to the configured CAPWAP tunnel entry, and the specific decapsulation method is the same as the prior art, and details are not described herein.

It should be noted that, in this embodiment, if the first AC learns that the AC corresponding to the identifier information is the first AC, the CAPWAP service packet may be directly configured according to the configured CAPWAP tunnel entry. Decapsulation, the specific decapsulation method is the same as the prior art, I will not repeat them here.

In this embodiment, the identifier information may be obtained from the obtained CAPWAP service packet according to the preset distribution policy, and the AC corresponding to the identifier information may be obtained according to the correspondence between the identifier information and the AC, so that the CAPWAP service may be redirected. The packet is sent to the corresponding AC, so that the CAPWAP service packet of the corresponding AC is decapsulated, and the multiple APs can be used to manage the AP in the WLAN, thereby ensuring normal operation of the AP in the WLAN. Since the switching device only needs to forward the CAPWAP service packet to the same device (the first AC), the addition of the AC in the system does not need to increase the configuration information on the switching device, thereby reducing the complexity of the configuration operation.

FIG. 5 is a schematic structural diagram of a device for processing a service packet in a wireless local area network according to an embodiment of the present invention. The WLAN of the embodiment may further include an AP and at least one AC, and the processing device may be respectively associated with the AP and the Said at least one AC is connected. As shown in FIG. 5, the processing device for the service packet in the WLAN of the embodiment may include a packet obtaining module 31, an information learning module 32, and a message processing module 33.

The packet obtaining module 31 obtains the CAPWAP service packet from the AP, and the information obtaining module 32 obtains the identifier information from the CAPWAP service packet according to the preset distribution policy, and obtains the corresponding information according to the correspondence between the identifier information and the AC. The AC corresponding to the identifier information, the CAPWAP service packet obtained by the packet processing module 33 obtained by the message learning module 32 and obtained by the information obtaining module 32, so that the information learning module 32 knows The corresponding AC decapsulates the CAPWAP service packet.

The function of the first AC in the foregoing embodiment of the present invention can be implemented by the processing device of the service packet in the wireless local area network provided by this embodiment.

Further, the packet obtaining module 31 in this embodiment may be further configured to receive from the AP. CAPWAP registration message. Specifically, after receiving the CAPWAP registration message from the AP, the packet obtaining module 31 may obtain the identification information from the CAPWAP registration message according to the preset distribution policy, and obtain the above information according to the correspondence between the identification information and the AC. The AC corresponding to the identifier information is configured to configure the CAPWAP tunnel entry corresponding to the AP on the AC, so that the corresponding AC decapsulates the CAPWAP service packet according to the CAPWAP tunnel entry. The CAPWAP tunnel entry may include a combination of one or more of a source MAC address, a destination MAC address, a VLAN, a source IP address, a destination IP address, a UDP source port number, and a UDP destination port number.

In this embodiment, the destination address of the CAPWAP service packet and the CAPWAP registration packet are both the IP address or the MAC address of the processing device provided in this embodiment.

The AP only knows the IP address or media access control of the processing device provided by this embodiment.

The MAC address does not need to be selected by the AC for registration. It only needs to register with the processing device, which reduces the complexity of the registration operation and improves the registration efficiency. Further, the CAPWAP tunnel entry corresponding to each AP can be configured on the AC corresponding to each AP by the packet obtaining module 31 in the processing device, which reduces the complexity of the management operation.

In this embodiment, the information obtaining module may obtain the identification information from the CAPWAP service packet obtained by the packet obtaining module according to the pre-set distribution policy, and further, according to the correspondence between the identifier information and the AC, the information corresponding to the identifier information may be obtained. The AC, so that the packet processing module redirects the CAPWAP service packet to the corresponding AC, so that the corresponding AC CAPWAP service packet is decapsulated, and multiple ACs can be managed on the AP in the WLAN. Therefore, the service of the AP in the wireless local area network is normally performed. Since the switching device only needs to forward the CAPWAP service packet to the same device (the first AC), the addition of the AC in the system does not need to increase the configuration information on the switching device, thereby reducing the complexity of the configuration operation. FIG. 6 is a schematic structural diagram of a system for processing a service packet in a wireless local area network according to an embodiment of the present invention. The system for processing a service packet in a wireless local area network according to the embodiment includes an AP 41, a first AC 42 and a second AC 43, The first AC 42 is connected to the AP 41 and the second AC 43 respectively, wherein

The first AC 42 may be configured to receive the CAPWAP service packet from the AP 41. The identifier information is obtained from the CAPWAP service packet according to a preset distribution policy, and the identifier is obtained according to the correspondence between the identifier information and the AC. The AC corresponding to the information sends the CAPWAP service packet to the corresponding AC, so that the corresponding AC decapsulates the CAPWAP service packet.

The function of the first AC in the foregoing embodiment of the present invention may be implemented by the first AC 42 in the processing system of the service packet in the wireless local area network provided by this embodiment.

It should be noted that the first AC and the second AC described in this embodiment may be two single boards in one device.

In this embodiment, the first AC may obtain the identifier information from the obtained CAPWAP service packet according to the preset distribution policy, and further obtain the AC corresponding to the identifier information according to the correspondence between the identifier information and the AC, so that Redirecting the CAPWAP service packet to the corresponding AC to decapsulate the CAPWAP service packet of the corresponding AC, and implementing multiple APs to manage the AP in the WLAN, thereby ensuring the AP in the WLAN The business is going on normally.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk. It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

A method for processing a service packet in a WLAN in a wireless local area network, wherein the WLAN includes an access point AP, a first access controller AC, and a second AC, and the first AC and the AP respectively Connected to the second AC, the method includes:

Receiving control of a wireless access point from the AP and configuring a CAPWAP service message;

Obtaining the identification information from the CAPWAP service packet according to the pre-set distribution policy, and obtaining the AC corresponding to the identifier information according to the correspondence between the identifier information and the AC;

Sending the CAPWAP service packet to the corresponding AC, so that the corresponding AC decapsulates the CAPWAP service packet.

2. The method according to claim 1, wherein the pre-set distribution policy comprises: combining one or a combination of a source port number, a source IP address, a radio frequency media access control MAC address, or wireless specific information. As identification information.

The method according to claim 1, wherein the receiving the CAPWAP service message from the AP further includes:

Receiving a CAPWAP registration message from the AP.

The method of claim 3, wherein the corresponding AC is configured with a CAPWAP tunnel entry, and the CAPWAP tunnel entry includes: a source MAC address, a destination MAC address, a virtual local area network VLAN, and a source IP address. a combination of one or more of an address, a destination IP address, a User Datagram Protocol UDP source port number, and a UDP destination port number;

The decapsulating the CAPWAP service packet by the corresponding AC includes: decapsulating the CAPWAP service packet by the corresponding AC according to the CAPWAP tunnel entry.

The method according to any one of claims 1 to 4, wherein the destination address of the CAPWAP service text is an IP address or a MAC address of the first AC.

The method according to claim 3 or 4, wherein the destination address of the CAPWAP registration message is an IP address or a MAC address of the first AC.

A processing device for a service packet in a WLAN, characterized in that the WLAN further includes an access point AP and at least one access controller AC, and the processing device is respectively associated with the AP and the at least An AC is connected, and the processing device includes:

The device according to claim 7, wherein the packet obtaining module is further configured to receive a CAPWAP registration message from the AP, where a destination address of the CAPWAP registration message is an IP address of the processing device. Or media access control MAC address.

The device according to claim 7 or 8, wherein the destination address of the CAPWAP service packet is an IP address of the processing device or a media access control MAC address.

A processing system for a service packet in a wireless local area network WLAN, comprising: an access point AP, a first access controller AC, and a second AC, wherein the first AC and the AP and the The second AC is connected, wherein The first AC is configured to receive the control of the wireless access point from the AP and configure the CAPWAP service packet; obtain the identification information from the CAPWAP service packet according to the preset distribution policy, and then use the identifier information to Corresponding to the AC, the AC corresponding to the identifier information is sent, and the CAPWAP service packet is sent to the corresponding AC, so that the corresponding AC decapsulates the CAPWAP service packet.

The system according to claim 10, wherein the first AC and the second AC are two boards in one device.