CN103346950A - Sharing method and device of load between user service boards of rack-mounted wireless controller - Google Patents

Abstract

The present invention discloses a method and device for sharing load between user service boards of a rack-type wireless controller. The method includes steps: S1, the interface board performs distribution control on the received uplink flow, and intercepts relevant field information in the data frame ; S2, calculate the intercepted relevant field information according to the distribution rule designed by the user; S3, reconstruct the data frame according to the calculation result, modify the corresponding field of the message or add an additional custom identification, so that the uplink of the interface board The traffic satisfies the distribution condition; S4, performs distribution control on the uplink traffic to be sent by the interface board. Through the present invention, wireless services with the same VLAN ID can be flexibly distributed to different service processing boards in the rack, thereby realizing single IP downlink of the whole machine and sharing of user service loads.

Description

A method and device for sharing load between user service boards of a rack-mounted wireless controller

technical field

The invention relates to the field of electronic communication, in particular to a method and device for sharing load between user service boards of a rack-type wireless controller.

Background technique

In order to understand the present invention more clearly, some technical terms commonly used in this field are firstly explained.

Interface board: The rack-mounted wireless controller has a unified external interface, which provides physical interfaces for the ingress and egress of uplink and downlink traffic, and is responsible for data forwarding, service distribution, and other functions.

Service board processing board: The single board in the rack-mounted wireless controller responsible for service processing. With high-performance multi-core processors and high-speed memory, it provides powerful business processing capabilities and is the core of the whole machine's business processing.

Wireless Access Point (AP, Wireless Access Point): also known as wireless bridge, wireless gateway, as a bridge connecting wired network and wireless network, connects various wireless network clients together, and connects wireless network to Ethernet .

Wireless Access Controller (AC, Wireless Access Controller): Responsible for managing APs in the wireless network, including issuing configurations, modifying related configuration parameters, etc., and forwarding and routing wireless data accessed by APs.

VLAN (Virtual Local Area Network): Virtual local area network is a data exchange technology that logically divides LAN devices into network segments to realize virtual workgroups.

A rack-mounted wireless controller generally consists of an interface board, a main control board, and multiple service processing boards. High-performance multi-core parallel processors are used as the business processing platform, and high-speed forwarding chips are used as the data forwarding platform to provide operation-level core-level business processing capabilities.

The rack-mounted wireless controller is mainly responsible for processing the conversion between wireless data and wired data, as well as the management and authentication of wireless users and APs in the entire network. After the wireless user, AP, and AC are normally associated, the user's uplink service sends the wireless data to the AC through the wired network through the AP, and first enters the interface board, and the interface board sends the service to the main controller according to the 802.1Q VLAN ID in the data frame The board passes through the switching plane of the main control board, and finally reaches the service board processing board. The data enters the protocol stack of the service board, and then finds the uplink interface to reach the Internet. The downlink service is also added to the 802.1Q VLAN tag on the service processing board, enters the interface through the switching plane of the main control board, then reaches the AP, and finally sends it to the wireless user. This realizes the normal data interaction between the wireless user and the target network.

In a carrier-level core network, a rack-mounted wireless controller usually needs to control and manage thousands or even tens of thousands of APs. These APs generally have the same 802.1Q VLAN ID and belong to the same Layer 2 network. They are connected to the interface board of the AC through a high-speed port or aggregation link of the switch. All user services finally pass through the AP and the switch with the same VLAN ID. Enter the AC. If these services carry the same VLAN ID and enter different AC service boards, it will bring great inconvenience to the inter-board routing design and switching plane forwarding. This requires the AC to be able to flexibly offload user services to different service processing boards, so that rack-mounted wireless controllers can share user service loads.

At present, the most common method is to divide the APs into different VLANs at the Layer 2 switch where the APs are connected. After passing through the switches, the services of different APs are marked with different VLAN IDs and enter the AC. The AC performs forwarding according to the VLAN ID, and the services of different VLANs are forwarded to different AC service boards, thereby realizing the offloading of AP services.

Another solution is that the wireless service also enters the AC with the same VLAN ID, the same VLAN is bound to multiple service processing boards at the same time, and the wireless service randomly arrives at different service processing boards. The downlink interface of the service processing board directly transparently transmits the wireless service layer 2, or configures the interface as a local mode. The system does not perform route synchronization of the interfaces between the boards, and each processes the local services. In this way, the offloading of AP services is also realized.

However, the first solution brings great inconvenience to the existing network. Before the equipment is upgraded, the APs and the Layer 2 network in the general area have been deployed. The downlink Layer 2 network often has only one VLAN, so the traffic distribution of this solution cannot be realized.

In the second solution, AP traffic is randomly allocated to different service processing boards, which cannot guarantee accurate load sharing, and at the same time, the AC cannot fully control the AP. This solution is generally not recommended in live networks.

Therefore, there is a great need in the prior art for a technology that can flexibly offload wireless services with the same VLAN ID to different service processing boards in the rack, so as to realize single IP downlink of the whole machine and load sharing of user services.

Contents of the invention

In view of the problems existing in the prior art, the purpose of the present invention is to provide a method and device for load sharing between user service boards of a rack-mounted wireless controller.

According to one aspect of the present invention, there is provided a method for load sharing between user service boards of a rack-mounted wireless controller, which is characterized in that it includes the steps:

S1, the interface board performs distribution control on the received uplink traffic, and intercepts relevant field information in the data frame;

S2, calculate the intercepted relevant field information according to the diversion rule designed by the user;

S3, reconstruct the data frame according to the calculation result, modify the corresponding field of the message or add an additional custom identifier, so that the upstream traffic entering the interface board meets the splitting condition;

S4. Perform splitting control on the uplink traffic to be sent by the interface board.

Preferably, for the downlink message, the message is aggregated at the interface board, that is, a reverse process of performing uplink time distribution, and after the data frame is reconstructed, it is then sent downlink to the corresponding AP to reach the wireless user.

Preferably, the flow is corresponding to different VLAN IDs according to the source MAC address in the wireless service, so as to realize offloading.

Preferably, all services are mapped to 4 different VLANs according to the last two bits of the source MAC address.

Preferably, traffic is corresponding to different VLAN IDs according to the VLAN TAG field in the message, so as to realize splitting.

Preferably, according to the PRI field in the 802.1Q VLAN TAG in the message, the 3-bit PRI field is mapped to 8 different VLANs.

Preferably, the source MAC address in the user traffic is analyzed, the hash operation is performed for alignment, and the traffic is divided according to the operation results corresponding to different VLAN IDs.

Preferably, the method is implemented by setting a distribution module on the interface board of the rack-mounted wireless controller.

Preferably, the method is realized by respectively setting distribution modules on the interface board and the main control board of the rack-mounted wireless controller.

Preferably, on different business processing boards of the rack-mounted wireless controllers, when processing wireless packets, the interfaces configure the same downlink IP address, use the local mode, do not perform system synchronization, and process the received user services respectively .

According to another aspect of the present invention, a rack-mounted wireless controller user service board load sharing device is provided, which is characterized in that it includes:

The ingress distribution control unit is used to perform distribution control on the upstream traffic received by the interface board, intercept relevant field information in the data frame, send relevant data and commands to the rule control unit; and perform data frame processing according to the calculation results returned by the rule control unit. Refactoring, modify the corresponding fields of the message or add additional custom identifiers, so that the upstream traffic entering the interface board meets the diversion conditions;

The rule control unit is used to calculate according to the diversion rule designed by the user, and return the calculation result to the inlet diversion control unit;

The outlet distribution control unit is used to control the distribution of the flow to be sent by the interface board.

Preferably, for the downlink message, the message is aggregated at the interface board, that is, a reverse process of performing uplink time distribution, and after the data frame is reconstructed, it is then sent downlink to the corresponding AP to reach the wireless user.

Preferably, the flow is corresponding to different VLAN IDs according to the source MAC address in the wireless service, so as to realize offloading.

Preferably, all services are mapped to 4 different VLANs according to the last two bits of the source MAC address.

Preferably, traffic is corresponding to different VLAN IDs according to the VLAN TAG field in the message, so as to realize splitting.

Preferably, according to the PRI field in the 802.1Q VLAN TAG in the message, the 3-bit PRI field is mapped to 8 different VLANs.

Preferably, the source MAC address in the user traffic is analyzed, the hash operation is performed for alignment, and the traffic is divided according to the operation results corresponding to different VLAN IDs.

Preferably, the device is arranged on the interface board of the rack-mounted wireless controller.

Preferably, the devices are respectively arranged on the interface board and the main control board of the rack-mounted wireless controller.

Preferably, on different business processing boards of the rack-mounted wireless controllers, when processing wireless packets, the interfaces configure the same downlink IP address, use the local mode, do not perform system synchronization, and process the received user services respectively .

Through the present invention, wireless services with the same VLAN ID can be flexibly distributed to different service processing boards in the rack, thereby realizing single IP downlink of the whole machine and sharing of user service loads.

Description of drawings

Fig. 1 illustrates a whole machine structure diagram of a load sharing device between user service boards of a rack-mounted wireless controller according to an embodiment of the present invention;

FIG. 2 illustrates a structural diagram of a load sharing device between user service boards of a rack-mounted wireless controller according to an embodiment of the present invention;

FIG. 3 illustrates a schematic diagram of a preferred shunting algorithm according to an embodiment of the present invention;

FIG. 4 illustrates a schematic diagram of another preferred shunting algorithm according to an embodiment of the present invention;

Fig. 5 illustrates the embodiment of the present invention uses the PRI field in the 802.1Q VLAN TAG to carry out the mapping diagram of offloading;

Fig. 6 illustrates the schematic diagram of mapping VLAN by SMAC field according to the embodiment of the present invention;

FIG. 7 illustrates a schematic diagram of downlink traffic conversion in which the SMAC field maps VLANs according to an embodiment of the present invention;

FIG. 8 illustrates an alternative structural diagram of a load sharing device between user service boards of a rack-mounted wireless controller according to an embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

FIG. 1 illustrates a structural diagram of a whole machine of a load sharing device between user service boards of a rack-mounted wireless controller according to an embodiment of the present invention.

As shown in FIG. 1 , the present invention is implemented by setting a distribution module on the interface board of the AC. The wireless user traffic entering the AC first reaches the interface board when going up, and then enters the distribution module at the interface board. The distribution module performs high-speed, high-accuracy matching and reconstruction on data frames, so that the output traffic is added to different 802.1Q VLAN tags, and then enters the main control board, then reaches the service processing board, and then reaches the target network upstream. When the downlink traffic enters the interface board, the packets are summarized and sent to the wireless users.

FIG. 2 illustrates a structural diagram of a load sharing device between user service boards of a rack-mounted wireless controller according to an embodiment of the present invention, that is, the above-mentioned distribution module. As shown in Figure 2, the device performs the following processes:

The ingress distribution control unit performs distribution control on the traffic received by the interface board, intercepts information such as the 802.1Q field and the source MAC address field of the data frame, and sends relevant data and commands to the rule control unit;

The rule control unit calculates according to the diversion rule designed by the user, and returns the calculation result to the inlet diversion control unit;

The ingress distribution control unit reconstructs the data frame according to the returned result, modifies the corresponding field of the message or adds an additional custom identification, so that the traffic entering the interface board meets the distribution condition;

The outlet distribution control unit performs distribution control on the traffic to be sent by the interface board. The implementation process is consistent with the principle of the inlet distribution control unit. Finally, the sent message has a specific distribution identification and meets the distribution conditions.

Regarding the distribution rules set in the above-mentioned rule control unit, various algorithms can be used in the present invention, and those skilled in the art should understand that any available distribution rules can be used to realize the present invention, and the following examples are only for illustrative purposes. It is not intended to constitute a limitation of the invention.

User uplink message distribution algorithm, in the distribution module, the distribution can be performed according to the source MAC address in the wireless service or the VLAN TAG field in the message.

Figure 3 illustrates a schematic diagram of a preferred shunting algorithm according to an embodiment of the present invention.

As shown in Figure 3, by analyzing the source MAC address in the message, the traffic is distributed to different VLANs. During the analysis of the source MAC address in the message (the address of the user corresponding to the AP), the The configuration uses different fields in the MAC address. For example, using the last two bits of the MAC address can map all services to four different VLANs. In this way, different traffic can be converted into different VLANs according to the characteristics of SMAC addresses in different packets to realize traffic distribution.

Accompanying drawing 4 illustrates the schematic diagram of another preferred shunting algorithm of the embodiment of the present invention.

As shown in Figure 4, for example, traffic can be offloaded according to the PRI field (User Priority) in the 802.1Q VLAN TAG in the user's uplink message.

The PRI field occupies 3 bits. There are 8 priorities defined in the 802.1P protocol, and the highest priority is 7. It is applied to key network traffic, such as the Routing Information Protocol (RIP) and the Open Shortest Path First (OSPF) protocol. routing table updates. Priorities 6 and 5 are mainly used for latency sensitive applications such as interactive video and voice. Priorities 4 to 1 are mainly used for controlled load applications such as streaming multimedia and business-critical traffic. Priority 0 is the default and is automatically enabled if no other priority value is set.

We take the PRI field in it for mapping, and FIG. 5 illustrates a schematic diagram of mapping using the PRI field in the 802.1Q VLAN TAG for offloading in the embodiment of the present invention.

Preferably, the PRI field in the message can be added by the AP side itself, or the AC can send rules to the AP, and add according to the rules. It can not be set according to the 802.1P regulations. For example, we only use the first 4 priorities, etc. .

In addition, preferably, the embodiment of the present invention further provides a third schematic distribution algorithm. Analyze the SMAC in the user traffic, align and perform hash operation. This is more suitable for the situation where there are a large number of APs in the live network and use different specifications, different manufacturers, and the MAC address is irregular. Carry out hash calculation on SMAC, and divide traffic according to the calculation result, which can more effectively ensure the load balance of services among different service boards. However, the hash operation in the shunt module also has disadvantages, such as taking up more CPU and memory resources.

The offloading algorithm mainly analyzes the packet header of the user's uplink traffic, and can be flexibly configured according to different environments of the live network to realize effective offloading in different scenarios. Here, we use the first, simpler shunting algorithm as an example to introduce it. When all user services enter the interface board, they all have a vlanM identifier. The ingress distribution control unit of the interface board analyzes the message, takes out the SMAC field of the message, and sends it to the rule control unit; the rule control unit takes the last two in the SMAC bit, map it to vlanA, vlanB, vlanC. As shown in Figure 6:

The last two bits of SMAC a1, SMAC a2, and SMAC a3 are 00;

The last two bits of SMAC b1, SMAC b2, and SMAC b3 are 01;

The last two bits of SMAC c1, SMAC c2, and SMAC c3 are 10.

Similarly, the egress distribution control unit marks the traffic with different 802.1Q VLAN identifiers vlanA, vlanB, and vlanC according to the calculation results of the rule control module, and the packets are sent to the main control board after reconstruction. In the switching plane of the main control board, the packets are respectively forwarded through channel 1, channel 2, and channel 3, and finally arrive at the service processing board with different VLAN IDs.

When processing wireless packets, interfaces on different service processing boards can be configured with the same downlink IP address, use the local mode, and process received user services separately without system synchronization. In this way, the load sharing of user services is realized.

User downlink packet distribution algorithm, the packets processed by the service processing board through the interface of this board have several different VLAN IDs of vlanA, vlanB, and vlanC respectively. The three channels of the main control board are respectively forwarded to the interface board. The ingress distribution control unit of the interface board needs to summarize the packets, which is a reverse process of the upstream distribution. In the distribution algorithm, the VID field in the VLAN ID is used. It is enough to divide the flow, and the principle is shown in Figure 7.

After the data frame is reconstructed, the VLAN ID in the traffic is restored, and then sent downlink to the corresponding AP to reach the wireless user.

The shunt module is a high-priority system module in the system. It adopts a high-efficiency shunt algorithm, which can realize the precise matching of the first 128 bytes of the data frame and wire-speed forwarding. The current solution gives priority to offloading based on the MAC address of the data frame and the VID field in the VLAN identifier. Later, it can be expanded for other fields of the message and the cascading of the system, so as to achieve a more accurate and flexible offloading algorithm.

Preferably, considering that the interface board may have excessive pressure when the flow rate is large in practical applications, the flow distribution module can be designed as two parts implemented on the interface board and the main control board respectively, so as to share the business pressure of the interface board. Its structure is shown in Figure 8.

The above is a detailed description of the preferred embodiments of the present invention, but those of ordinary skill in the art should realize that various improvements, additions and substitutions are possible within the scope and spirit of the present invention. Algorithms to achieve the same functional purpose, implemented using different programming languages (such as C, C++, Java, etc.). These are all within the scope of protection defined by the claims of the present invention.

Claims (20)

1. method is shared in load equally between a rack wireless controller customer service plate, it is characterized in that comprising step:

S1, interface board carries out flow-dividing control to the uplink traffic of receiving, the relevant field information in the data intercept frame;

S2 calculates the relevant field information that is truncated to according to the shunting rule of user's design;

S3 carries out Frame reconstruct according to result of calculation, revises the message corresponding field or adds extra user-defined identification, thereby make the uplink traffic that enters interface board satisfy the shunting condition;

S4, the uplink traffic that the butt joint oralia is about to send is carried out flow-dividing control.

2. the method for claim 1 is characterized in that:

For downlink message, the place gathers message at interface board, namely carries out an inverse process of up time shunting, and Frame is by after the reconstruct, and then descendingly sends to corresponding AP, reaches the wireless user.

3. method as claimed in claim 1 or 2 is characterized in that:

According to the source MAC in the wireless traffic flow is corresponded to different VLAN ID, thereby realize shunting.

4. method as claimed in claim 3 is characterized in that:

Latter two bit according to source MAC is mapped to 4 different VLAN with all business.

5. method as claimed in claim 1 or 2 is characterized in that:

According to the VLAN TAG field in the message flow is corresponded to different VLAN ID, thereby realize shunting.

6. method as claimed in claim 5 is characterized in that:

According to the PRI field among the 802.1Q VLAN TAG in the message, with PRI field mappings to 8 a different VLAN of 3 bits.

7. method as claimed in claim 1 or 2 is characterized in that:

Resolve the source MAC in the customer flow, the hash computing is carried out in alignment, corresponds to different VLAN ID according to operation result and shunts.

8. method as claimed in claim 1 or 2 is characterized in that:

Described method arranges diverter module by the interface board at the rack wireless controller and realizes.

9. method as claimed in claim 1 or 2 is characterized in that:

Described method realizes by diverter module is set respectively on the interface board of rack wireless controller and master control borad.

10. method as claimed in claim 1 or 2 is characterized in that:

On the different service processing board of described rack wireless controller, interface disposes same downstream IP address when handling wireless message, uses local mode, does not carry out system synchronization, deals with the customer service of receiving separately.

11. device is shared in load equally between a rack wireless controller customer service plate, it is characterized in that comprising:

Entrance flow-dividing control unit carries out flow-dividing control for the uplink traffic that the butt joint oralia is received, the relevant field information in the data intercept frame sends related data and order to regular control unit; And carry out Frame reconstruct according to the result of calculation that regular control unit returns, revise the message corresponding field or add extra user-defined identification, thereby make the uplink traffic that enters interface board satisfy the shunting condition;

The rule control unit is used for calculating according to the shunting rule of user's design, and result of calculation is returned to entrance flow-dividing control unit;

Outlet flow-dividing control unit, the flow that is about to send for the butt joint oralia carries out flow-dividing control.

12. device as claimed in claim 11 is characterized in that:

For downlink message, the place gathers message at interface board, namely carries out an inverse process of up time shunting, and Frame is by after the reconstruct, and then descendingly sends to corresponding AP, reaches the wireless user.

13. as claim 11 or 12 described devices, it is characterized in that:

According to the source MAC in the wireless traffic flow is corresponded to different VLAN ID, thereby realize shunting.

14. device as claimed in claim 13 is characterized in that:

Latter two bit according to source MAC is mapped to 4 different VLAN with all business.

15. as claim 11 or 12 described devices, it is characterized in that:

According to the VLAN TAG field in the message flow is corresponded to different VLAN ID, thereby realize shunting.

16. device as claimed in claim 15 is characterized in that:

According to the PRI field among the 802.1Q VLAN TAG in the message, with PRI field mappings to 8 a different VLAN of 3 bits.

17. as claim 11 or 12 described devices, it is characterized in that:

Resolve the source MAC in the customer flow, the hash computing is carried out in alignment, corresponds to different VLAN ID according to operation result and shunts.

18. as claim 11 or 12 described devices, it is characterized in that:

Described device is arranged on the interface board of described rack wireless controller.

19. as claim 11 or 12 described devices, it is characterized in that:

Described device is arranged at respectively on the interface board and master control borad of described rack wireless controller.

20. as claim 11 or 12 described devices, it is characterized in that:

On the different service processing board of described rack wireless controller, interface disposes same downstream IP address when handling wireless message, uses local mode, does not carry out system synchronization, deals with the customer service of receiving separately.

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