CN101252498B - Access point, access controller and communication method thereof - Google Patents
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- CN101252498B CN101252498B CN200810103369XA CN200810103369A CN101252498B CN 101252498 B CN101252498 B CN 101252498B CN 200810103369X A CN200810103369X A CN 200810103369XA CN 200810103369 A CN200810103369 A CN 200810103369A CN 101252498 B CN101252498 B CN 101252498B
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Abstract
The invention provides an access point, an access controller and the communication method. The method comprises the steps that the access point, a master access controller and a slave access controller establish an LWAPP tunnel simultaneously; the master access controller and the slave access controller perform synchronization to the access point information and the user information; switching is performed when the connection between the access point and the master access controller is interrupted, and the communication is performed through the established LWAPP tunnel and the slave access controller. The switching speed can be effectively enhanced according to the access point, the access controller and the communication method.
Description
Technical field
The present invention relates to WLAN (wireless local area network) (Wireless Local Area Network, WLAN) technology, particularly relate to access point in the WLAN (wireless local area network) (Access Point, AP), access controller (AccessController, AC) and communication means.
Background technology
WLAN provides a kind of wireless connections service of local area network (LAN), because wireless data access at a high speed can be provided, WLAN is one of relatively more popular technology of present IT industry, also is popular wireless access way.WLAN adopts centralized AC-AP framework usually, and wherein, AC provides the centralized management of wlan network, and AP then by connecting with AC, behind the adding wlan network, provides the wireless access service.
As shown in Figure 1, in the Centralized Wireless LAN system, what the transfer of data between AP and the AC was used is Lightweight Access Point Protocol (Light Weight Access Point Protocol, LWAPP) tunnel.On AC and AP, independent maintenance one cover state machine separately, by the interacting message synchronous regime, the foundation in LWAPP tunnel AP needn't be considered when data forwarding and AC between complicated routing relation, make getting in touch between AC and the AP become simple.
The key that the LWAPP tunnel is set up is the LWAPP state machine that AC and AP safeguard synchronously separately.AP determines whether to be in normal connection status with AC by the keep-alive message, and determine can not be again with related AC proper communication the time as AP, and the link between AC and the AP will enter anger (sulk) state.Particularly, AP is (for example 10 seconds) in Preset Time, when not receiving the keep-alive response message of AC, determine its with AC be connected interruption (for example, AC breaks down, LWAPP tunnel between AC and the AP breaks down).
In the prior art, have no progeny in being connected of AP and AC, AP sets up the LWAPP tunnel with backup AC, and then communicates with backup AC by the LWAPP tunnel of setting up.In the existing AC backup scenario, AP with have no progeny during AC is connected, (1) AP need wait for a period of time and could determine that described connection interrupts (not receiving the keep-alive response message in Preset Time); (2) AP need set up the LWAPP tunnel with backup AC; (3) AP needs download configuration information again, and AC need authenticate again to the user who inserts; It is slow that these all cause AP to switch to the speed that backs up AC, and the handoff procedure user can perception.
Summary of the invention
Technical problem to be solved by this invention provides method, access point, the access controller that access point and access controller communicate in a kind of WLAN (wireless local area network), make when access point interrupted with being connected of access controller, can switch to other access controller rapidly, communicate with other access controller.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
The method that access point and access controller communicate in a kind of WLAN (wireless local area network) comprises step:
A, access point send the discovering access controller request, and obtaining can be for the access controller tabulation that inserts;
B, access point select main access controller and from access controller from described access controller tabulation, and the main access controller address information that will select sends to from access controller so that carry out between principal and subordinate's access controller access-in point information and user profile synchronously;
C, access point are set up the LWAPP tunnel with described main access controller with from access controller respectively;
D, access point are being connected just often with main access controller, and the LWAPP tunnel of selecting to set up with main access controller communicates, and when being connected interruption with main access controller, select to communicate with the LWAPP tunnel of setting up from access controller.
Above-mentioned method, among the step B, access point selects main access controller according to the parameter of carrying in the discovering access controller response message that receives and from access controller, the parameter of carrying in the described discovery response message comprises: principal and subordinate's access controller information of static configuration on the access controller that sends described discovery response message.
Above-mentioned method, among the step B, access point selects main access controller according to the parameter of carrying in the discovering access controller response message that receives and from access controller, the parameter of carrying in the described discovery response message comprises: send principal and subordinate's access point number that the access controller of described discovery response message has connected.
Whether above-mentioned method also comprises among the step D, and access point detects the up going port state that this access point is connected with access controller in real time, determine normal with being connected of access controller according to the up going port state.
The method that access point and access controller communicate in a kind of WLAN (wireless local area network) comprises step:
Receive the main access controller address information that access point sends from access controller;
From access controller when being in non-communications status, from synchronous access-in point information of main access controller and user profile with access point;
Set up the LWAPP tunnel from access controller with access point, the communication request of response access point communicates by LWAPP tunnel and the access point of setting up.
Above-mentioned method also comprises: when being in communications status with access point, access-in point information and user profile are synchronized to main access controller from access controller.
The method that access point and access controller communicate in a kind of WLAN (wireless local area network) comprises step:
Main access controller is set up the LWAPP tunnel with access point, and the communication request of response access point communicates by LWAPP tunnel and the access point of setting up;
Main access controller is when being in communications status with access point, and response is synchronized to access-in point information and user profile from access controller from the synchronization request of access controller.
Above-mentioned method also comprises: main access controller receives the access-in point information and the user profile of coming synchronously from access controller when being in non-communications status with access point.
A kind of access point comprises:
The discovering access controller module is used to send the discovering access controller request, and obtaining can be for the access controller tabulation that inserts;
The principal and subordinate selects module, be used for from the described access controller tabulation main access controller of selection with from access controller, and the main access controller address information that will select sends to from access controller so that carry out between principal and subordinate's access controller access-in point information and user profile synchronously;
The LWAPP client is used for setting up the LWAPP tunnel with described main access controller with from access controller respectively;
Select communication module, be used for being connected just often with main access controller at this access point, the LWAPP tunnel of selecting to set up with main access controller communicates, and when this access point is connected interruption with main access controller, selects to communicate with the LWAPP tunnel of setting up from access controller.
A kind of access controller comprises:
The address information receiver module is used to receive the main access controller address information that access point sends;
First synchronization module is used for when this access controller and access point are in non-communications status, from synchronous access-in point information of main access controller and user profile;
The one LWAPP service end is used for setting up the LWAPP tunnel with access point, and the communication request of response access point communicates by LWAPP tunnel and the access point of setting up.
A kind of access controller comprises:
Second synchronization module is used for when this access controller and access point are in communications status, and response is synchronized to access-in point information and user profile from access controller from the synchronization request of access controller;
The 2nd LWAPP service end is used for setting up the LWAPP tunnel with access point, and the communication request of response access point communicates by LWAPP tunnel and the access point of setting up.
In the embodiments of the invention, access point is set up the LWAPP tunnel with main access controller with from access controller simultaneously, described main access controller and between the access controller access-in point information and user profile being carried out synchronously, so, when access point interrupted with being connected of access controller, can switch rapidly, communicate by LWAPP tunnel and the access controller of having set up.In access point, also port detecting module can be set, detect the up going port state that access point is connected with access controller in real time by described port detecting module, determine whether normal according to the up going port state with being connected of access controller, further improved switch speed, handoff procedure terminal use unaware.
Description of drawings
Fig. 1 is the LWAPP tunnel schematic diagram in the existing wlan system;
The method flow diagram that Fig. 2 communicates for access point in the WLAN (wireless local area network) of the embodiment of the invention and access controller;
Fig. 3 is the structural representation of the WLAN connecting system of the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Referring to Fig. 2, the method that access point and access controller communicate in the WLAN (wireless local area network) of the embodiment of the invention mainly comprises the steps:
Behind the AP electrifying startup, send AC by the broadcasting or the mode of clean culture and find request message; Can respond AC to AP for the AC that inserts and find response message; After AP receives the response message of a plurality of AC, just obtained and to have tabulated for the AC that this AP inserts.
The embodiment of the invention provides two kinds of implementation methods of selecting principal and subordinate AC, and is as follows:
(1) on AC, realizes by configuration
When the network planning, for the fixing principal and subordinate AC of each AP configuration, promptly on AC, carry out static configuration, configuration result is the main AC of this AC as which AP, and as which AP from AC.AC carries the principal and subordinate AC information of described configuration when sending AC discovery response message to AP.After AP receives AC discovery response message, can determine just that according to the parameter (principal and subordinate AC information) of carrying in the discovery response message the main AC of this AP reaches from AC.As can be seen, static configuration has certain effect for the tool of sharing of flow.It should be noted that AC goes up the maximum AP access amount that the principal and subordinate AP sum that disposes can not surpass AC.
(2) use automatic AP (AUTO-AP) to realize
AC is when sending AC discovery response message to AP, need carry the principal and subordinate AP number that this AC has connected, after AP receives AC discovery response message, the parameter finding to carry in the response message (the main AP number that this AC has connected and from the AP number) is analyzed, determined the principal and subordinate AC of oneself based on the flow equilibrium principle.
In an embodiment of the present invention, AP selects a main AC, selects one or more from AC.AP also sends to main AC address information from AC after having selected principal and subordinate AC, so that carry out synchronous (specifically referring to the description in the step 204) of AP information and user profile between the principal and subordinate AC.
LWAPP tunnel between AP and the AC to set up process same as the prior art, do not give unnecessary details here.
In step 204, the preferential selection of AP communicates with main AC, and promptly AP is being connected just often with main AC, and the LWAPP tunnel of selecting to set up with main AC communicates; Only when being connected interruption with main AC, just can selecting and communicate from AC.That is to say that with from the communication process of AC, if being connected and recovering normal of AP and main AC, AP still can switch to main AC and communicate.
In order after switching, directly to communicate, also need synchronous AP information (for example, the configuration information of AP) and user profile (for example, user authentication information, charge information) between principal and subordinate AC by the LWAPP tunnel of having set up.Owing to the address information that step 202, has got access to main AC from AC, like this, just can set up privately owned synchronous tunnel between the principal and subordinate AC, carry out the synchronous of AP information and user profile by this tunnel.
Particularly, AP is being connected just often with main AC, and AP sends communication request to main AC, and the communication request of main AC response AP communicates by LWAPP tunnel and the AP that sets up.At this moment, be in non-communications status from AC and AP, send synchronization request by privately owned tunnel to main AC from AC, main AC response is synchronized to AP information and user profile from AC from the synchronization request of AC.AP is when being connected interruption with main AC, AP is to sending communication request from AC, and the communication request from AC response AP communicates by LWAPP tunnel and the AP that sets up, and AP information and user profile are passed through the synchronous main AC of returning in privately owned tunnel.
In step 204, whether AP can normal with being connected of AC by determining to AC transmission keep-alive message, and still, as previously mentioned, AP need wait for a period of time and could determine whether described connection is normal.Whether therefore, in embodiments of the present invention, AP can also detect the up going port state that this AP is connected with AC in real time, determine normally with being connected of AC according to the up going port state, so, can effectively improve switch speed.
Corresponding with the method that communicates between above-mentioned AP and the AC, the present invention also provides the connecting system of a kind of WLAN.
Referring to Fig. 3, the WLAN connecting system of the embodiment of the invention mainly comprises: access point 10, first access controller 20, second access controller 30 and IP network 40; Interconnect by IP network 40 between access point 10, first access controller 20, second access controller 30.Here, suppose that second access controller 30 is the main access controller of access point 10, first access controller 20 be access point 10 from access controller (certainly, also can choose more than onely from access controller, be example with one from access controller here).
Discovering access controller module 11 is used to send the discovering access controller request, and obtaining can be for the access controller tabulation that inserts.
The principal and subordinate selects module 12, be used for from the described access controller tabulation main access controller of selection with from access controller, and the main access controller address information that will select sends to from access controller.Two kinds of implementations are arranged, the principal and subordinate selects module 12 to select according to principal and subordinate's access controller information of static configuration on the access controller that sends described discovery response message of finding to carry in the response message, perhaps, the principal and subordinate selects module 12 to select according to principal and subordinate's access point number that the access controller of the described discovery response message of finding to carry in the response message of transmission has connected.
Wherein, also can comprise port detecting module (figure does not show) in the described access point 10, be used for detecting in real time the up going port state that this access point is connected with access controller, determine whether normal with being connected of access controller according to the up going port state.
Address information receiver module 21 is used to receive the main access controller address information that access point sends.
The one LWAPP service end 23 is used for setting up the LWAPP tunnel with access point, and the communication request of response access point communicates by LWAPP tunnel and the access point of setting up.
The 2nd LWAPP service end 32 is used for setting up the LWAPP tunnel with access point, and the communication request of response access point communicates by LWAPP tunnel and the access point of setting up.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (16)
1. an access point is characterized in that, comprising:
The discovering access controller module is used to send the discovering access controller request, and obtaining can be for the access controller tabulation that inserts;
The principal and subordinate selects module, be used for from the described access controller tabulation main access controller of selection with from access controller, and the main access controller address information that will select sends to from access controller so that carry out between principal and subordinate's access controller access-in point information and user profile synchronously;
The LWAPP client is used for setting up the LWAPP tunnel with described main access controller with from access controller respectively;
Select communication module, be used for being connected just often with main access controller at this access point, the LWAPP tunnel of selecting to set up with main access controller communicates, and when this access point is connected interruption with main access controller, selects to communicate with the LWAPP tunnel of setting up from access controller.
2. access point as claimed in claim 1 is characterized in that:
Described principal and subordinate selects module, the parameter that is further used for carrying in the basis discovering access controller response message that receives selects main access controller and from access controller, the parameter of carrying in the described discovery response message comprises: principal and subordinate's access controller information of static configuration on the access controller that sends described discovery response message.
3. access point as claimed in claim 1 is characterized in that:
Described principal and subordinate selects module, be further used for selecting main access controller and from access controller, the parameter of carrying in the described discovery response message comprises: send principal and subordinate's access point number that the access controller of described discovery response message has connected according to the parameter of carrying in the discovering access controller response message that receives.
4. require 1 described access point as profit, it is characterized in that, also comprise:
Whether port detecting module is used for detecting in real time the up going port state that this access point is connected with access controller, determine normal with being connected of access controller according to the up going port state.
5. an access controller is characterized in that, comprising:
The address information receiver module is used to receive the main access controller address information that access point sends;
First synchronization module is used for when this access controller and access point are in non-communications status, from synchronous access-in point information of main access controller and user profile;
The one LWAPP service end is used for setting up the LWAPP tunnel with access point, and the communication request of response access point communicates by LWAPP tunnel and the access point of setting up.
6. access controller as claimed in claim 5 is characterized in that:
Described first synchronization module also is used for when this access controller and access point are in communications status access-in point information and user profile being synchronized to main access controller.
7. an access controller is characterized in that, comprising:
Second synchronization module is used for when this access controller and access point are in communications status, and response is synchronized to access-in point information and user profile from access controller from the synchronization request of access controller;
The 2nd LWAPP service end is used for setting up the LWAPP tunnel with access point, and the communication request of response access point communicates by LWAPP tunnel and the access point of setting up.
8. access controller as claimed in claim 7 is characterized in that:
Described second synchronization module also is used for receiving the access-in point information and the user profile of coming synchronously from access controller when this access controller and access point are in non-communications status.
9. the method that access point and access controller communicate in the WLAN (wireless local area network) is characterized in that, comprises step:
A, access point send the discovering access controller request, and obtaining can be for the access controller tabulation that inserts;
B, access point select main access controller and from access controller from described access controller tabulation, and the main access controller address information that will select sends to from access controller so that carry out between principal and subordinate's access controller access-in point information and user profile synchronously;
C, access point are set up the LWAPP tunnel with described main access controller with from access controller respectively;
D, access point are being connected just often with main access controller, and the LWAPP tunnel of selecting to set up with main access controller communicates, and when being connected interruption with main access controller, select to communicate with the LWAPP tunnel of setting up from access controller.
10. method as claimed in claim 9 is characterized in that:
Among the step B, access point selects main access controller according to the parameter of carrying in the discovering access controller response message that receives and from access controller, the parameter of carrying in the described discovery response message comprises: principal and subordinate's access controller information of static configuration on the access controller that sends described discovery response message.
11. method as claimed in claim 9 is characterized in that:
Among the step B, access point selects main access controller according to the parameter of carrying in the discovering access controller response message that receives and from access controller, the parameter of carrying in the described discovery response message comprises: send principal and subordinate's access point number that the access controller of described discovery response message has connected.
12. method as claimed in claim 9 is characterized in that:
Comprise also among the step D that access point detects the up going port state that this access point is connected with access controller in real time, determine whether normal according to the up going port state with being connected of access controller.
13. the method that access point and access controller communicate in the WLAN (wireless local area network) is characterized in that, comprises step:
Receive the main access controller address information that access point sends from access controller;
From access controller when being in non-communications status, from synchronous access-in point information of main access controller and user profile with access point;
Set up the LWAPP tunnel from access controller with access point, the communication request of response access point communicates by LWAPP tunnel and the access point of setting up.
14. method as claimed in claim 13 is characterized in that, also comprises:
When being in communications status, access-in point information and user profile are synchronized to main access controller from access controller with access point.
15. the method that access point and access controller communicate in the WLAN (wireless local area network) is characterized in that, comprises step:
Main access controller is set up the LWAPP tunnel with access point, and the communication request of response access point communicates by LWAPP tunnel and the access point of setting up;
Main access controller is when being in communications status with access point, and response is synchronized to access-in point information and user profile from access controller from the synchronization request of access controller.
16. method as claimed in claim 15 is characterized in that, also comprises:
Main access controller receives the access-in point information and the user profile of coming synchronously from access controller when being in non-communications status with access point.
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| CN200810103369XA CN101252498B (en) | 2008-04-03 | 2008-04-03 | Access point, access controller and communication method thereof |
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| CN101610533B (en) * | 2009-07-13 | 2011-09-07 | 杭州华三通信技术有限公司 | Method and device for realizing backup switching of access controller |
| CN101711010B (en) * | 2009-12-01 | 2012-07-04 | 西安大唐电信有限公司 | Underground wireless communication method and system |
| CN101815365B (en) * | 2010-04-02 | 2012-09-05 | 北京傲天动联技术有限公司 | Discovery, correlation and configuration method of wireless access controller |
| CN102118813B (en) * | 2011-01-21 | 2013-11-06 | 西安理工大学 | Train communication system and method based on AP (Assess Point) switching |
| US8582422B2 (en) | 2011-04-05 | 2013-11-12 | Hewlett-Packard Development Company, L.P. | Access point configuration propagation |
| CN102256250A (en) * | 2011-07-08 | 2011-11-23 | 杭州华三通信技术有限公司 | Wireless terminal information synchronization method in wireless local area network and equipment thereof |
| CN103188790B (en) * | 2011-12-29 | 2016-03-02 | 中兴通讯股份有限公司 | Information synchronization method and access controller |
| CN102625325B (en) * | 2012-03-13 | 2016-01-20 | 杭州华三通信技术有限公司 | A kind of wireless network deployment method and WAP (wireless access point) |
| CN102752172B (en) * | 2012-07-13 | 2014-12-31 | 杭州华三通信技术有限公司 | Control method and control device for switching AP (Access Point) between hot standby ACs (Access Controllers) |
| CN103916853A (en) * | 2012-12-31 | 2014-07-09 | 中兴通讯股份有限公司 | Control method for access node in wireless local-area network and communication system |
| CN104168171B (en) * | 2014-08-12 | 2017-12-01 | 深信服科技股份有限公司 | The access method and device of access point |
| CN105491622B (en) * | 2015-11-18 | 2019-03-01 | 深圳市共进电子股份有限公司 | The methods, devices and systems of wireless network parameter configuration |
| US10764949B2 (en) | 2018-08-23 | 2020-09-01 | Hewlett Packard Enterprise Development Lp | Multi-connection access point |
| CN113746716B (en) * | 2016-10-28 | 2023-03-31 | 慧与发展有限责任合伙企业 | Multi-connection access point |
| CN106357532B (en) * | 2016-11-21 | 2021-02-23 | 新华三技术有限公司 | Message response method and device |
| CN108093441B (en) * | 2017-12-22 | 2021-03-02 | 新华三技术有限公司 | Switching method and device of access controller |
| CN108337158B (en) * | 2018-01-23 | 2020-12-04 | 新华三技术有限公司 | Unicast message forwarding method and device |
| CN108712783B (en) * | 2018-03-22 | 2021-01-12 | 新华三技术有限公司 | CAPWAP tunnel establishment method and device |
| CN108934035B (en) * | 2018-06-26 | 2020-07-07 | 新华三技术有限公司 | Data backup method and device |
| CN111327507A (en) * | 2018-12-17 | 2020-06-23 | 上海擎感智能科技有限公司 | APN link load balancing realization method and system |
| CN111010705B (en) * | 2019-12-25 | 2024-03-12 | 迈普通信技术股份有限公司 | Method and system for synchronizing wireless access point and wireless controller address in cascading scene |
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