CN105471768B - CAPWAP message transmission method and the network switch - Google Patents

Abstract

The present invention relates to fields of communication technology, disclose a kind of CAPWAP message transmission method and the network switch, in this scenario, after there is no the cable card board of CAPWAP tunnel processing capacity to receive CAPWAP message, CAPWAP message can be sent to the cable card board with CAPWAP tunnel processing capacity, therefore, it solves the problems, such as that the cable card board of no CAPWAP tunnel processing capacity can not be handled CAPWAP message, improves the flexibility of transmission CAPWAP message.

Description

CAPWAP message transmission method and network switch

technical field

The present invention relates to the field of communication technology, in particular to a control and provisioning of wireless access point (English: Control And Provisioning of Wireless Access Points, abbreviation: CAPWAP) message transmission method and a network switch.

Background technique

A wireless local area network (English: wireless local area network, abbreviation: WLAN) includes a wireless terminal point (English: Wireless Termination Point, abbreviation: WTP) and an access controller (English: AccessController, abbreviation: AC). Control and manage the WTP in the wireless LAN.

The packet forwarding mode of WTP is divided into tunnel forwarding (also called "centralized forwarding") and direct forwarding (also called "local forwarding"). The tunnel forwarding means that when the WTP forwards a packet, it first forwards the packet to the AC through the CAPWAP tunnel, and then the AC forwards the packet. When the packet forwarding mode of the WTP is tunnel forwarding, as shown in Figure 1, after the station (English: station, abbreviation: STA) packet reaches the WTP, the WTP encapsulates the packet to obtain a CAPWAP packet and sends it to the AC. Then the AC decapsulates the CAPWAP packet to obtain the original packet of the STA, and then forwards the original packet. The STA is a device having an interface to a wireless medium (English: wireless medium, abbreviated: WM). The STA may be a wireless terminal, such as a laptop computer (English: laptop computer), a tablet computer (English: tablet computer), a mobile phone, and the like.

An AC may manage multiple WTPs, and there is a CAPWAP tunnel between each WTP and the AC. After the AC receives the message sent by the STA through the CAPWAP tunnel, the AC will store the address of the STA and the CAPWAP tunnel entry of the tunnel. The CAPWAP tunnel entry includes: the IP address of the WTP, the port number of the WTP used for the CAPWAP tunnel, and the port number of the AC used for the CAPWAP tunnel. AC receives a message from the Internet (English: Internet), and when it wants to send the message to the STA, it finds the CAPWAP tunnel entry according to the mapping between the address of the STA and the CAPWAP tunnel entry, and then uses the found CAPWAP tunnel table The item encapsulates the message from the Internet and sends it.

Currently, the AC function is usually carried on a network switch. There are multiple line card boards on the network switch, some of the multiple line card boards are line card boards capable of CAPWAP tunnel processing, and some line card boards are line card boards lacking of CAPWAP tunnel processing capability. After the WTP encapsulates the received message into a CAPWAP message, it sends the CAPWAP message to the line card with the CAPWAP tunnel processing capability. After the line card with the CAPWAP tunnel processing capability processes the CAPWAP message, it forwards the decapsulated message. A line card lacking the CAPWAP tunnel processing capability cannot process the CAPWAP message. Therefore, the current CAPWAP message transmission method has a defect of low flexibility.

To sum up, at present, because the line cards without the CAPWAP tunnel processing capability cannot process the CAPWAP packets, there is a defect of low flexibility.

Contents of the invention

Embodiments of the present invention provide a CAPWAP message transmission method and a network switch, which are used to solve the defect of low flexibility existing in the current process of transmitting CAPWAP messages.

The specific technical scheme that the embodiment of the present invention provides is as follows:

In the first aspect, a method for controlling wireless access points and providing CAPWAP message transmission is provided, including:

The first line card board of the network switch receives the first message from the wireless terminal point WTP, wherein the first line card board is a first type line card board, and the first type line card board lacks CAPWAP tunnel processing capable line cards;

The first line card board determines that the first packet from the WTP is a CAPWAP packet;

The first line card board sends the first message to a second line card board of the network switch, wherein the second line card board is a second type line card board, and the second type line card board It is a line card board capable of processing CAPWAP tunnels.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the first line card board sending the first message to the second line card board includes:

The first line card board sends the first message to the second line card board according to the mapping from the first line card board to the second line card board; or

The first line card board sends the first message to the second line card according to the address of the WTP in the first message and the mapping from the address of the WTP to the second line card board plate.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the first line card sends the first message to the After the second line card board, also include:

The second line card obtains the CAPWAP tunnel entry corresponding to the first message, the CAPWAP tunnel entry includes the address of the WTP in the CAPWAP header of the first message, and the first The source port number and destination port number of the CAPWAP message header of the message;

The second line card board decapsulates the first packet, and obtains the source address of the decapsulated first packet;

The second line card records the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet.

With reference to the second possible implementation of the first aspect, in a third possible implementation of the first aspect, the second line card records the CAPWAP tunnel entry and the decapsulated first report After the mapping of the source address of the text, it also includes:

The network switch records the mapping between the identifier of the second line card board and the source address of the decapsulated first packet in all first-type line card boards of the network switch.

With reference to the second or third possible implementation of the first aspect, in a fourth possible implementation of the first aspect, the second line card records the CAPWAP tunnel entry and the decapsulated After the mapping of the source address of the first packet, it also includes:

The network switch synchronizes the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet to all second-type line card boards other than the second line card board of the network switch .

With reference to the third or fourth possible implementation of the first aspect, in a fifth possible implementation of the first aspect, the method further includes:

The third line card board of the network switch receives the second message, the third line card board is a first type line card board, the destination address of the second message and the address of the decapsulated first message The source address is the same;

The third line card sends the second message according to the destination address of the second message and the mapping between the identifier of the second line card and the source address of the decapsulated first message to the second line card board;

The second line card board obtains the CAPWAP tunnel entry according to the destination address of the second message and the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first message, and according to The CAPWAP tunnel entry encapsulates the second packet.

In combination with any possible implementation manner in the third to fifth possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the method further includes:

The second line card board receives a third message, and the destination address of the third message is the same as the source address of the decapsulated first message;

The second line card board obtains the CAPWAP tunnel entry according to the destination address of the third message and the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first message, and according to The CAPWAP tunnel entry encapsulates the third packet.

In a second aspect, a network switch is provided, including a backplane, a first line card board, and a second line card board, the first line card board and the second line card board are connected through the backplane, and the first line card board The line card board is a first type line card board, the first type line card board is a line card board that lacks wireless access point control and provides CAPWAP tunnel processing capabilities, and the second line card board is a second type line card board , the second type of line card board is a line card board with CAPWAP tunnel processing capability, wherein:

The first line card board is configured to receive the first message from the wireless terminal point WTP, determine that the first message from the WTP is a CAPWAP message, and send the first message to the network The second line card board of the switch;

The second line card board is configured to receive the first message sent by the first line card board.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the first line card board is specifically used for:

sending the first message to the second line card according to the mapping from the first line card to the second line card; or

Send the first message to the second line card board according to the address of the WTP in the first message and the mapping from the address of the WTP to the second line card board.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in the second possible implementation manner of the second aspect, the second line card board is also used for:

Obtain the CAPWAP tunnel entry corresponding to the first packet, the CAPWAP tunnel entry includes the address of the WTP in the CAPWAP packet header of the first packet, and the CAPWAP packet of the first packet The source port number and destination port number of the header;

Decapsulate the first packet, and obtain the source address of the decapsulated first packet;

Record the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet.

With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the network switch further includes a main control board, and the main control board communicates with the The first line card board is connected to the second line card board, wherein:

The main control board is configured to receive the source address of the decapsulated first message sent by the second line card board, and combine the identifier of the second line card board with the decapsulated first message The mapping of the source address of the text is recorded in all the first type line card boards of the network switch.

With reference to the third possible implementation of the second aspect, in a fourth possible implementation of the second aspect, the network switch includes a plurality of second-type line card boards, and the main control board is further configured to:

receiving the mapping between the CAPWAP tunnel entry sent by the second line card and the source address of the decapsulated first packet, and combining the CAPWAP tunnel entry with the decapsulated first packet The mapping of the source address of the text is synchronized to all second-type line card boards other than the second line card board of the network switch.

With reference to the second possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the second line card board is further configured to send A mapping between the identifier of the second line card board and the source address of the decapsulated first message;

All first-type line card boards of the network switch record the mapping between the identifier of the second line card board and the source address of the decapsulated first packet.

With reference to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, the network switch includes multiple second-type line card boards, and the second line card boards are also used to Synchronize the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet to all second-type line card boards other than the second line card board of the network switch.

With reference to any one possible implementation manner of the third to sixth possible implementation manners of the second aspect, in a seventh possible implementation manner of the second aspect, the network switch further includes a third line card board, The third line card board is connected to the main control board, the first line card board, and the second line card board through the backplane, the third line card board is a first type line card board, and the The destination address of the second message is the same as the source address of the decapsulated first message, wherein:

The third line card board is used to receive the second message, and according to the destination address of the second message and the mapping between the identifier of the second line card board and the source address of the decapsulated first message, sending the second message to the second line card;

The second line card board is also used for:

Obtain the CAPWAP tunnel entry according to the destination address of the second packet and the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet, and obtain the CAPWAP tunnel entry according to the CAPWAP tunnel entry Encapsulate the second packet.

With reference to any possible implementation manner in the third to seventh possible implementation manners of the second aspect, in an eighth possible implementation manner of the second aspect, the second line card board is further used for:

receiving a third packet, where the destination address of the third packet is the same as the source address of the decapsulated first packet;

According to the destination address of the third packet and the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet, the CAPWAP tunnel entry is obtained, and according to the CAPWAP tunnel entry Encapsulate the third packet.

The beneficial effects of the present invention are as follows:

Generally, a line card board lacking CAPWAP tunnel processing capability cannot process a CAPWAP message. Therefore, there is a problem of low flexibility. In the embodiment of the present invention, the first line card board of the network switch receives the first report from the WTP In this document, the first line card board is a first type line card board, and the first type line card board is a line card board lacking CAPWAP tunnel processing capability; the first line card board determines that the first message from the WTP is a CAPWAP message Text; the first line card board sends the first message to the second line card board of the network switch, wherein the second line card board is a second type of line card board, and the second type of line card board is a line card with CAPWAP tunnel processing capability In this solution, the first line card that determines the CAPWAP tunnel processing capability can send the CAPWAP message to the second line card after receiving the CAPWAP message, and the second line card has the CAPWAP tunnel processing capability, so , which solves the problem that the line cards without CAPWAP tunnel processing capability cannot process CAPWAP packets, and improves flexibility.

Description of drawings

Figure 1 is a schematic diagram of tunnel forwarding;

FIG. 2A is a schematic structural diagram of a network switch;

Fig. 2B is a detailed flowchart of CAPWAP message transmission in the embodiment of the present invention;

Fig. 3 is the embodiment of CAPWAP message transmission in the embodiment of the present invention;

FIG. 4 is a schematic diagram of a physical structure of a network switch in an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention. The embodiments of the invention and the features in the embodiments can be combined with each other.

The structure of the network switch is shown in Figure 2A, which mainly includes: main control board, backplane (English: backplane), power supply, line card board (English: line card board) with CAPWAP tunnel processing capability, and lack of CAPWAP tunnel processing capability line card board, where:

Main control board: used for the processing of the control plane of the network switch, such as the calculation of the routing protocol and other operations. The main control board generally includes a central processing unit (English: central processing unit, abbreviation: CPU).

Line card board: used for data plane processing of network switches, such as packet forwarding and other operations. The line card board includes a line card chip (English: line card circuit). The line card chip can be a network processor (English: network processor, abbreviation: NP), an application-specific integrated circuit (English: application-specific integrated circuit, abbreviation: ASIC), a programmable logic device (English: programmable logic device, abbreviation: PLD ) or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (English: complex programmable logic device, abbreviated: CPLD), field-programmable logic gate array (English: field-programmable gate array, abbreviated: FPGA), general array logic (English: generic array logic, abbreviation: GAL) or a combination thereof.

Backplane: used to provide connections between multiple line card boards, and between line card boards and the main control board.

Power supply: used to provide power to the network switch.

Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to Figure 2B, in the embodiment of the present invention, a detailed process of CAPWAP message transmission is as follows:

Step 200: The first line card board of the network switch receives the first message from the WTP, wherein the first line card board is a first type line card board, and the first type line card board is a line card lacking CAPWAP tunnel processing capability plate.

Step 210: The first line card board determines that the first packet from the WTP is a CAPWAP packet.

Step 220: The first line card board sends the first message to the second line card board of the network switch, wherein the second line card board is a second type of line card board, and the second type of line card board is capable of processing CAPWAP tunnels Line card board.

The STA sends the message to the WTP, and the WTP performs CAPWAP encapsulation on the received message to obtain the CAPWAP message, that is, the first message. The WTP sends the first message to the network switch, where the first message includes the message sent by the STA.

In the embodiment of the present invention, when the first line card board determines that the first message from the WTP is a CAPWAP message, the following methods may be used:

The first line board determines that the first message from the WTP is a CAPWAP message according to the destination User Datagram Protocol (English: User Datagram Protocol, abbreviation: UDP) port number of the first message.

Wherein, if the destination UDP port number of the first packet is 5246 or 5247, the first packet is a CAPWAP packet.

If there is only one line card of the second type in the network switch, that is, the second line card, the first line card sends the first message to the only line card of the second type. Specifically, all the first-type line card boards record the unique second-type line card board, that is, the identifier of the second line card board. That is, there is a mapping from the first line card to the second line card in the first line card, and the first line card sends the first message to the second line card according to the mapping from the first line card to the second line card. Card board.

If the network switch includes multiple second-type line card boards, the CAPWAP packets received by different first-type line card boards in the network switch may be sent to different second-type line card boards respectively. When the first line card board sends the first packet to the second line card board, the following two methods can be adopted:

Manner 1: The first line card sends the first message to the second line card according to the mapping from the first line card to the second line card.

Method 2: The first line card sends the first message to the second line card according to the address of the WTP in the first message and the mapping from the address of the WTP to the second line card.

If method 1 is adopted, before sending the first message to the second line card, the first line card first searches for a mapping from the first line card to the second line card, and if the mapping is found, the The first message is sent to the second line card board. If the mapping cannot be found, the first line card selects one of multiple second-type line card boards as the second line card board according to predetermined rules, for example, according to the load of the second-type line card board, and assigns the first line card board to the A message is sent to the second line card. The first line card records the mapping from the first line card to the second line card, and then all CAPWAP packets received by the first line card are sent to the second line card.

If method 2 is adopted, before sending the first message to the second line card, the first line card first searches for the mapping from the address of the WTP in the first message to the second line card. The mapping sends the first message to the second line card. If the mapping cannot be found, the first line card selects one of multiple second-type line card boards as the second line card board according to predetermined rules, for example, according to the load of the second-type line card board, and assigns the first line card board to the A message is sent to the second line card. The first line card records the mapping from the address of the WTP to the second line card, and then all the CAPWAP messages received by the first line card from the WTP are sent to the second line card. If a CAPWAP message sent by a new WTP is received, a second-type line card is reselected.

After each WTP sends a CAPWAP message to the second-type line card, the second-type line card needs to generate a CAPWAP tunnel entry. Therefore, the more CAPWAP tunnel entries stored in the second-type line card, the remaining The smaller the space for storing CAPWAP tunnel entries, the more WTPs managed by the second line card. Therefore, in a scenario where there are multiple second-type line card boards in the network switch, in order to balance the load of each second-type line card board, further, the first line card board receives each second-type line card board of the network switch The remaining space for storing CAPWAP tunnel entries in the sent card board of this line. When it is necessary to select one of the second-type line cards as the second line card, the first line card selects the second-type line card with the largest remaining space for storing the CAPWAP tunnel entry as the second line card.

For example, a total of 10 line card boards are inserted into the network switch, among which line card boards No. 1-5 are the first type line card boards, line card boards No. Each line card in the card board can store CAPWAP tunnel entries with a total space of 1K. If line cards 6-10 can store CAPWAP tunnel entries, the remaining space is 0.5K, 0.4K, 0.3K, and 0.3K respectively. K, 0.2K, then, when the line card board receives the CAPWAP message, it sends the CAPWAP message to the line card board.

In the embodiment of the present invention, the CAPWAP tunnel entry may be stored on the forwarding chip of the second type line card board.

In the embodiment of the present invention, after the first line card board sends the first message to the second line card board, the following operations are further included:

The second line board obtains the CAPWAP tunnel entry corresponding to the first packet. The CAPWAP tunnel entry includes the address of the WTP in the CAPWAP packet header of the first packet, the source port number and destination port number;

The second line card board decapsulates the first packet, and obtains the source address of the decapsulated first packet;

The second line card records the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet.

Wherein, the source address of the first packet may be the MAC address of the STA.

In the embodiment of the present invention, after the first line card board receives the message sent to the WTP, it can send the message to the corresponding second line card board, and the second line card board records the CAPWAP tunnel entry and the decapsulated After mapping the source address of the first message, the network switch records the mapping between the identifier of the second line card and the source address of the decapsulated first message in all first-type line cards of the network switch.

Optionally, if the network switch includes multiple second-type line card boards, after receiving the message sent to the WTP, the second-type line card board outside the second line card board can directly encapsulate the message according to the CAPWAP tunnel entry. After the second line card records the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet, the network switch compares the CAPWAP tunnel entry with the decapsulated The mapping of the source address of the first packet is synchronized to all second-type line card boards other than the second line card board.

When the network switch records the mapping between the identification of the second line card board and the source address of the decapsulated first message in all the first type line card boards of the network switch, it can be done by the main control board in the network switch It can also be done by the second line card in the network switch, that is to say, there are two ways:

Method 1: The main control board receives the source address of the decapsulated first packet sent by the second line card, and records the mapping between the identifier of the second line card and the source address of the decapsulated first packet in the network In all the first type line card boards of the switch;

Method 2: The second line card board sends the mapping between the identification of the second line card board and the source address of the decapsulated first message to all the first type line card boards of the network switch;

All first-type line card boards of the network switch record the mapping between the identifier of the second line card board and the source address of the decapsulated first packet.

Similarly, when the network switch synchronizes the mapping between the CAPWAP tunnel table entry and the source address of the decapsulated first packet to all second-type line card boards outside the second line card board, it may be the master in the network switch The control board can also be made by the second line card board in the network switch, that is to say, there are two ways:

Method 1: The main control board receives the mapping between the CAPWAP tunnel entry sent by the second line board and the source address of the decapsulated first packet, and compares the CAPWAP tunnel entry with the source address of the decapsulated first packet The mapping of is synchronized to all second-type line card boards other than the second line card board of the network switch;

Method 2: The second line card synchronizes the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet to all second-type line cards other than the second line card of the network switch.

The above process describes that the WTP sends the message to the network switch. In the embodiment of the present invention, the network switch may also send the message to the WTP. Therefore, the above method also includes the following operations:

The third line card of the network switch receives the second message, the third line card is the first type of line card, and the destination address of the second message is the same as the source address of the decapsulated first message. The third line card sends the second message to the second line card according to the destination address of the second message and the mapping between the identifier of the second line card and the source address of the decapsulated first message. Other first-type line card boards, such as the first line card board, if they receive a message with the same destination address as the source address of the decapsulated first message, they also perform the same operation to send the message to the first Second line board.

The second line card obtains the CAPWAP tunnel entry according to the destination address of the second packet and the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet, and encapsulates the second packet according to the CAPWAP tunnel entry.

In the embodiment of the present invention, the following operations are also included:

The second line card board receives the third message, and the destination address of the third message is the same as the source address of the decapsulated first message;

The second line card obtains the CAPWAP tunnel entry according to the destination address of the third packet and the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet, and encapsulates the third packet according to the CAPWAP tunnel entry.

Other second-type line card boards, such as the fourth line card board, also perform similar operations if they receive a packet with the same destination address as the source address of the decapsulated first packet. Since the mapping between the synchronous CAPWAP tunnel entry and the source address of the decapsulated first packet has been saved in the fourth line card, the fourth line card can obtain the CAPWAP tunnel entry according to the mapping, and based on the CAPWAP The tunnel entry encapsulates the third packet.

Optionally, when the first line card board sends the first message to the second line card board, a special redirection port (English: Redirect Special Port, abbreviation: RDSP) is encapsulated outside the first message, and RSDP is used for notification The first packet of the second line card is a CAPWAP packet, so that the second line card does not need to determine the type of the first packet again.

Alternatively, in another scenario, the first line card can also encapsulate a common port pointing to the second line card outside the first message, and the second line card determines the first message after receiving the first message It is a CAPWAP message.

Still taking the above embodiment as an example for illustration: when the card board of line 1 sends the determined CAPWAP message to the card board of line 6, RSDP is encapsulated outside the determined CAPWAP message to notify line 6 Card board, the message sent by the card board of line 1 to the card board of line 6 is a CAPWAP message, the card board of line 6 does not need to confirm the type of the message sent by the card board of line 1 again, the card board of line 6 according to The RSDP encapsulated outside the packet sent by line card 1 determines that the packet is a CAPWAP packet, directly decapsulates the CAPWAP packet sent by line card 1, and sends the decapsulated packet. If 1 If the line card does not encapsulate RSDP outside the determined CAPWAP message, the line 6 card first needs to determine the type of the received message sent by the line 1 card, and when it determines that the type of the message is a CAPWAP message , and then decapsulate the message sent by the card board of line 1, and send the decapsulated message.

In order to better understand the embodiments of the present invention, specific application scenarios are given below, and a further detailed description is made for the process of CAPWAP message transmission, as shown in Figure 3 (WTP sends messages to the network switch):

Neither the line card board nor the line card board of line 2 has the CAPWAP tunnel processing capability, and the line card board of line 5 is the line card board that sends the CAPWAP message determined by the line card board of line 1.

Step 300: The line card board of line 1 receives the first message from the WTP.

Step 310: The No. 1 line card determines the first message received from the WTP as a CAPWAP message according to the destination UDP port number, and sends the first message to the No. 5 line card.

In this step, RSDP is encapsulated outside the first packet.

Step 320: The card board of line 5 receives the first message sent by the card board of line 1, and determines that the message sent by the card board of line 1 is a CAPWAP message according to the encapsulated RDSP.

Step 330: The line card board obtains the CAPWAP tunnel entry corresponding to the first message, decapsulates the first message, obtains the source address of the decapsulated first message; and records the CAPWAP tunnel entry and the decapsulated A mapping of the source address of the first packet is then sent.

In this embodiment, the line card board on line 1 sends the received CAPWAP message to the line card board on line 5, and the line card board performs decapsulation and other related processing on the CAPWAP message and sends it, which solves the problem of line 1 The defect that the board cannot send CAPWAP messages improves the flexibility of transmitting CAPWAP messages.

In the embodiment of the present invention, the No. 1 line card board may receive the second message sent to the WTP, therefore, the above process also includes the following operations:

Step 340: Line 1 board receives the second packet, the destination address of the second packet is the same as the source address of the decapsulated first packet.

Step 350: Line card board 1 sends the second message to line card 5 according to the destination address of the second message and the mapping between the identification of line card board 5 and the source address of the decapsulated first message plate.

Step 360: The line card board obtains the CAPWAP tunnel entry according to the destination address of the second packet and the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet, and encapsulates the first packet according to the CAPWAP tunnel entry. second packet, and sends the encapsulated second packet to the WTP.

In this embodiment, line card board No. 1 sends the received message to line card board No. 5, and line card board No. 5 performs encapsulation and other related processing on the message and sends it to WTP, which solves the problem of The board cannot send CAPWAP messages to the WTP, which improves the flexibility of transmitting CAPWAP messages.

Based on the above technical solution, as shown in FIG. 4 , an embodiment of the present invention provides a network switch, including a backplane 40, a first line card board 41 and a second line card board 42, and the first line card board 41 and the second line card board The boards 42 are connected through the backplane 40, the first line card board 41 is a first type line card board, the first type line card board is a line card board lacking the CAPWAP tunnel processing capability, and the second line card board 42 is a second type line card board board, the second type of line card board is a line card board with CAPWAP tunnel processing capability, wherein:

The first line card board 41 is used to receive the first message from no WTP, determine that the first message from the WTP is a CAPWAP message, and send the first message to the second line card board 42 of the network switch;

The second line card board 42 is configured to receive the first packet sent by the first line card board 41 .

In this embodiment of the present invention, optionally, the first line card board 41 is specifically used for:

Send the first message to the second line card board 42 according to the mapping from the first line card board 41 to the second line card board 42; or

The first message is sent to the second line card board 42 according to the address of the WTP in the first message and the mapping from the address of the WTP to the second line card board 42 .

In the embodiment of the present invention, further, the second line card board 42 is also used for:

Obtain the corresponding CAPWAP tunnel table entry of the first message, the CAPWAP tunnel table entry includes the address of the WTP in the CAPWAP message header of the first message, the source port number and the destination port number of the CAPWAP message header of the first message;

Decapsulate the first packet, and obtain the source address of the decapsulated first packet;

Record the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet.

In the embodiment of the present invention, further, the network switch further includes a main control board 43, and the main control board is connected to the first line card board 41 and the second line card board 42 through the backplane 40, wherein:

The main control board 43 is used to receive the source address of the decapsulated first message sent by the second line card board 42, and record the mapping between the identification of the second line card board 42 and the source address of the decapsulated first message In all type 1 line card boards of network switches.

In the embodiment of the present invention, further, the network switch includes a plurality of second-type line card boards, and the main control board 43 is also used for:

Receive the mapping between the CAPWAP tunnel entry sent by the second line card board 42 and the source address of the decapsulated first packet, and synchronize the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet to the network All second-type line card boards except the second line card board 42 of the switch.

In the embodiment of the present invention, optionally, the second line card board 42 is also used to send the identification of the second line card board 42 and the source address of the decapsulated first message to all the first type line card boards of the network switch. mapping;

All first-type line card boards of the network switch record the mapping between the identifier of the second line card board 42 and the source address of the decapsulated first packet.

In the embodiment of the present invention, optionally, the network switch includes multiple second-type line card boards, and the second line card board 42 is also used to synchronize the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet To all second-type line card boards except the second line card board 42 of the network switch.

In the embodiment of the present invention, further, the network switch further includes a third line card board 44, and the third line card board 44 is connected to the main control board 43, the first line card board 41, and the second line card board 42 through the backplane 40. The card board 44 is a first type line card board, and the destination address of the second message is the same as the source address of the decapsulated first message, wherein:

The third line card board 44 is used to receive the second message, and according to the destination address of the second message and the mapping between the identification of the second line card board 42 and the source address of the decapsulated first message, send the second message to the second line card board 42;

The second line card board 42 is also used for:

Obtain the CAPWAP tunnel entry according to the destination address of the second packet and the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet, and encapsulate the second packet according to the CAPWAP tunnel entry.

In the embodiment of the present invention, further, the second line card board 42 is also used for:

receiving the third packet, where the destination address of the third packet is the same as the source address of the decapsulated first packet;

According to the destination address of the third packet and the mapping between the CAPWAP tunnel entry and the source address of the decapsulated first packet, the CAPWAP tunnel entry is obtained, and the third packet is encapsulated according to the CAPWAP tunnel entry.

To sum up, in the embodiment of the present invention, a method for transmitting CAPWAP messages is proposed: the first line card board of the network switch receives the first message from the WTP, wherein the first line card board is the first type line card board, the first type of line card board is a line card board lacking CAPWAP tunnel processing capability; the first line card board determines that the first message from the WTP is a CAPWAP message; the first line card board sends the first message to The second line card board of the network switch, wherein the second line card board is a second type line card board, and the second type line card board is a line card board with CAPWAP tunnel processing capability. In this solution, it does not have CAPWAP tunnel processing capability After receiving the CAPWAP message, the first line card can send the CAPWAP message to the second line card, and the second line card has the CAPWAP tunnel processing capability. The problem that the CAPWAP message cannot be processed improves the flexibility of transmitting the CAPWAP message.

Apparently, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these modifications and variations.

Claims (12)

1. a kind of wireless access point control and offer CAPWAP message transmission method, which is characterized in that including：

First cable card board of the network switch receives the first message from wireless terminal point WTP, wherein first cable card board For first kind cable card board, the first kind cable card board is the cable card board for lacking CAPWAP tunnel processing capacity；

First cable card board determines that first message from WTP is CAPWAP message；

First message is sent to the second cable card board of the network switch by first cable card board, wherein described Two cable card boards are Second Type cable card board, and the Second Type cable card board is the cable card board with CAPWAP tunnel processing capacity；

The network switch includes multiple Second Type cable card boards, and the method further includes：

Second cable card board obtains the corresponding CAPWAP tunnel list item of first message, and the CAPWAP tunnel list item includes The address of the WTP in the CAPWAP message head of first message, the source of the CAPWAP message head of first message Slogan and destination slogan；

Second cable card board decapsulates first message, obtains the source address of the first message after decapsulation；

Second cable card board records reflecting for the CAPWAP tunnel list item and the source address of the first message after the decapsulation It penetrates；

The network switch by the mapping of the source address of the first message after the CAPWAP tunnel list item and the decapsulation, All Second Type cable card boards being synchronized to outside second cable card board of the network switch.

2. the method as described in claim 1, which is characterized in that first message is sent to described by first cable card board Second cable card board, including：

First cable card board sends first message according to first cable card board to the mapping of second cable card board To second cable card board；Or

First cable card board is according to the address of WTP described in first message and the address of the WTP to described second First message is sent to second cable card board by the mapping of cable card board.

3. the method as described in claim 1, which is characterized in that second cable card board record the CAPWAP tunnel list item with After the mapping of the source address of the first message after the decapsulation, further include：

The network switch reflects the mark and the source address of the first message after the decapsulation of second cable card board It penetrates, is recorded in all first kind cable card boards of the network switch.

4. the method as described in claim 1, which is characterized in that the method further includes：

The third cable card board of the network switch receives the second message, and the third cable card board is first kind cable card board, institute The destination address for stating the second message is identical with the source address of the first message after the decapsulation；

The third cable card board is according to the destination address of second message and the mark of second cable card board and the solution Second message is sent to second cable card board by the mapping of the source address of the first message after encapsulation；

Second cable card board is according to the destination address of second message and the CAPWAP tunnel list item and the deblocking The mapping of the source address of the first message after dress obtains the CAPWAP tunnel list item, and according to the CAPWAP tunnel list item Encapsulate second message.

5. method as described in claim 3 or 4, which is characterized in that the method further includes：

Second cable card board receives third message, the destination address and the first message after the decapsulation of the third message Source address it is identical；

Second cable card board is according to the destination address of the third message and the CAPWAP tunnel list item and the deblocking The mapping of the source address of the first message after dress obtains the CAPWAP tunnel list item, and according to the CAPWAP tunnel list item Encapsulate the third message.

6. a kind of network switch, which is characterized in that including backboard, the first cable card board, the second cable card board and master control borad, the master Control plate is connected by the backboard with first cable card board, second cable card board, first cable card board and described second Cable card board is connected by the backboard, and first cable card board is first kind cable card board, and the first kind cable card board is scarce Weary wireless access point control and the cable card board for providing CAPWAP tunnel processing capacity, second cable card board is Second Type line card Plate, the Second Type cable card board are the cable card board with CAPWAP tunnel processing capacity, wherein：

First cable card board, for receiving the first message from wireless terminal point WTP, determine described in from WTP first Message is CAPWAP message, and first message is sent to the second cable card board of the network switch；

Second cable card board, first message sent for receiving first cable card board；

Second cable card board is additionally operable to：Obtain the corresponding CAPWAP tunnel list item of first message, the CAPWAP tunnel List item includes the address of the WTP in the CAPWAP message head of first message, the CAPWAP message of first message The source port number and destination slogan of head；First message is decapsulated, the source address of the first message after decapsulation is obtained；Note Record the mapping of the CAPWAP tunnel list item and the source address of the first message after the decapsulation；

The network switch includes multiple Second Type cable card boards, and the master control borad is used for：Receive the second cable card board hair The mapping of the CAPWAP tunnel list item that send and the source address of the first message after the decapsulation, and by the CAPWAP tunnels The mapping of road list item and the source address of the first message after the decapsulation is synchronized to second line of the network switch All Second Type cable card boards outside snap-gauge.

7. the network switch as claimed in claim 6, which is characterized in that first cable card board is specifically used for：

According to first cable card board to the mapping of second cable card board, first message is sent to second line card Plate；Or

It, will according to the address of WTP described in first message and the address of the WTP to the mapping of second cable card board First message is sent to second cable card board.

8. the network switch as claimed in claim 6, which is characterized in that the master control borad is additionally operable to receive second line card The source address of the first message after the decapsulation that plate is sent, and will be after the mark of second cable card board and the decapsulation The first message source address map record in all first kind cable card boards of the network switch.

9. the network switch as claimed in claim 6, which is characterized in that second cable card board is additionally operable to hand over to the network All first kind cable card boards changed planes send the source of the mark and the first message after the decapsulation of second cable card board The mapping of address；

After all first kind cable card boards of the network switch record mark and the decapsulation of second cable card board The first message source address mapping.

10. the network switch as claimed in claim 9, which is characterized in that the network switch includes multiple Second Types Cable card board, second cable card board are additionally operable to by the source of the first message after the CAPWAP tunnel list item and the decapsulation The mapping of location is synchronized to all Second Type cable card boards outside second cable card board of the network switch.

11. the network switch as described in any one of claim 8 to 10, which is characterized in that the network switch is also Including third cable card board, the third cable card board passes through the backboard and the master control borad, first cable card board, described second Cable card board is connected, and the third cable card board is first kind cable card board, after the destination address of the second message and the decapsulation The source address of first message is identical, wherein：

The third cable card board is for receiving second message, according to the destination address of second message and described second Second message is sent to described the by the mapping of the mark and the source address of the first message after the decapsulation of cable card board Two cable card boards；

Second cable card board is additionally operable to：

According to the destination address of second message and the CAPWAP tunnel list item and the first message after the decapsulation Source address mapping, obtain the CAPWAP tunnel list item, and according to CAPWAP tunnel list item encapsulation second report Text.

12. the network switch as described in any one of claim 8 to 10, which is characterized in that second cable card board is also For：

Third message is received, the destination address of the third message is identical with the source address of the first message after the decapsulation；

According to the destination address of the third message and the CAPWAP tunnel list item and the first message after the decapsulation The mapping of source address obtains the CAPWAP tunnel list item, and encapsulates the third message according to the CAPWAP tunnel list item.