CN101557616B

CN101557616B - Method for accessing AP (access point) to switch backup access controller and AP (access point) and AC (access controller)

Info

Publication number: CN101557616B
Application number: CN2009100847642A
Authority: CN
Inventors: 赵玄
Original assignee: Hangzhou H3C Technologies Co Ltd
Current assignee: New H3C Technologies Co Ltd
Priority date: 2009-05-19
Filing date: 2009-05-19
Publication date: 2011-05-11
Anticipated expiration: 2029-05-19
Also published as: CN101557616A

Abstract

The invention discloses a method for accessing AP to AC by switching backup, and AP and AC, which are used for the networking mode of AC-thinning access points (FIT AP). The method comprises the stepsof: preserving configuration downloaded from the service AC when FIT AP judges that the connected service AC fails; establishing connection with backup AC and transferring the configuration to the ba ckup AC; and leading backup AC to adopt the configuration to displace the service AC to continue to provide the service. As the FIT AP has no need to download the configuration from the backup AC, thepre-storage of the configuration of the FIT AP in the backup AC is not needed, thus largely reducing the configuration amount of backup AC.

Description

Access point switches method and the access point and the access controller of backup access controller

Technical field

The present invention relates to wireless communication technology field, particularly access point (AP) switches method and AP and the AC that backs up access controller (AC) in the wireless network.

Background technology

The networking mode of present wireless network mainly contains fat access point (FAT AP) and access controller (AC) adds two kinds of patterns of thin access point (FIT AP), and wherein AC+FIT AP mode is suitable for large scale deployment because manageability is strong, obtains application more and more widely.

In the networking of AC+FIT ap mode, FIT AP only realizes the function of transfer of data, and netconfig function is not provided, the all-network configuration and administration feature realized by AC, wherein, and FIT AP zero configuration, by connecting with professional AC, and from professional AC download configuration, the wireless access service is provided.Pass through wireless access point control and supply (CAPWAP between AC and FIT AP, Controlling andProvisioning of Wireless Access Point) agreement connects, the CAPWAP protocol definition how to communicate by letter between AP and the AC, provide a generic encapsulation and transmission mechanism for realizing the interoperability between AP and the AC.

The CAPWAP agreement operates on AP and the AC simultaneously, for wlan system provides communicating by letter between safe AC and the AP.The CAPWAP agreement uses udp protocol as bearing protocol in IP network, and supports IPv4 and IPv6, but AP sets up with the secundum legem UDP client end/server end model of communicating by letter between the AC.The CAPWAP agreement provides data tunnel to encapsulate to mail to the packet of AC, and these packets can be the packets of 802.11 agreements.The CAPWAP agreement is also supported long-range AP configuration, WLAN management and the roaming management of AC.On AC, the CAPWAP agreement provides AP management function, and AC can dynamically dispose AP according to the information that the keeper provides.

In the concrete realization, CAPWAP uses Lightweight Access Point Protocol (LWAPP, Light WeightAccess Point Protocol) realizes state machine, AP is as the state machine client, AC is as the server state machine end, through Idle--＞Discovery--＞Join--＞Join Confirm--＞Configure--＞a plurality of states such as Run, finally set up the tunnel and be connected with AC.

At in the customer network AC being backed up the demand that guarantees professional high reliability, utilize the state machine mechanism of LWAPP agreement itself at present, the N that can realize AC than 1 cold standby and N than N hot-backup function.With 4 to 1 cold standbys is example, and Fig. 1 is typical wireless network 4 to 1 cold standby system group network structural representations.

In Fig. 1, AC1 to AC4 is the working traffic AC that four actual motion wireless users insert, and backup (backup) AC is the cold standby AC of AC1 to AC4; Many FIT AP of AP1～APn are connected with backup AC with professional AC by switching network.Wherein, switching network can be any one or a plurality of switching equipment, for example one or more switches etc.

In standby system as shown in Figure 1, the process that existing AP switches backup AC is as follows:

With AC1 is that the main of AP1 is example with AC, after starting, AP1 can obtain the IP address of two AC by pre-configured DHCP, it is respectively the IP address of AC1 and Backup AC, AP1 can send connection request to two AC, two AC1 carry the precedence information of AP1 in the configuration of this locality in the message of this connection request of response, because set in advance AC1 is the main AC that uses of FIT AP1, that is to say the priority height of AP on the priority ratio Backup AC that sets in advance the last AP of AC1, then AP can set up the tunnel with AC1 and is connected, and connect to download AC1 by the tunnel and go up, thereby provide the wireless access service for client to configuration that should AP1.At this moment, if AC1 breaks down, with the interruption that is connected of AP1, then AP1 will start timer (this timer is by the LWAPP protocol definition), if after AP1 judges this timer expiry, think the AC1 fault, abandon the configuration that obtains from AC1, initiate the tunnel to Backup AC subsequently and connect, obtain to set in advance on the Backup AC to configuration that should AP1, thereby recover the wireless access service, realize the switching of backup AC.

Under the standby system of Fig. 1, for realizing the switching of backup AC, require to store simultaneously on the Backup AC configuration that AC1 to AC4 goes up all AP, its configuration amount is very huge, and when change appears in network (as increasing or replacing AP), need the configuration on while maintenance service AC and the Backup AC, maintenance workload is increased greatly; In addition, because the processing of AC and the restriction of storage resources, the professional AC quantity that BackupAC can back up is limited, and the networking of AC standby system is restricted.Under the situation that mutually redundant N is equipped with than N heat between many AC, also need there be the big and big problem of maintenance of configuration amount equally in the configuration of the AP on the backup AC of pre-configured its correspondence on every AC.

Summary of the invention

The method that the embodiment of the invention provides a kind of access point to switch the backup access controller can reduce the configuration amount that backs up AC.

The embodiment of the invention provides a kind of access point, can reduce the configuration amount of backup AC.

The embodiment of the invention provides a kind of access controller, as backup AC, can reduce the configuration amount of backup AC.

For achieving the above object, technical scheme of the present invention specifically is achieved in that

A kind of AP switches the method for backup AC, is used for the networking model of AC+FIT AP, and this method comprises:

When FIT AP judges connected professional AC fault, keep the configuration of downloading from described professional AC;

By with the backup AC connect, and with described configuration be sent to the backup AC;

Backup AC uses described configuration to replace professional AC to continue to provide business service.

A kind of AP is used for the network environment that AC adds FIT AP, and described AP comprises:

Fault detection module is used to detect whether fault of the professional AC that is connected with AP;

Module is preserved in configuration, links to each other with described fault detection module, is used for when described fault detection module is judged the professional AC fault that is connected with AP, and reservation is from the configuration of described professional AC download;

Handover module links to each other with described fault detection module, is used for connecting with backup AC, and described configuration is sent to backup AC, makes described backup AC according to the described configuration that receives, and replaces professional AC to continue to provide business service.

A kind of AC is used for the network environment that AC adds FIT AP, and described AC comprises:

The configuration download module, foundation is connected with AP's, and from the AP download configuration;

The configuration application module links to each other with described configuration download module, is used to use the configuration of described download that business service is provided.

As seen from the above technical solutions, this AP of the present invention switches in the method for backup AC, and FITAP need not to go up download configuration from backup AC, therefore need not the configuration at backup AC storage FIT AP, thereby can significantly reduce the configuration amount of backup AC; In addition, when network changes, only need make amendment to the configuration of professional AC, therefore can reduce the maintenance of whole AC standby system, simultaneously, owing to do not have the configuration capacity requirement on the backup AC, make backup AC can be used to back up more professional AC simultaneously, reduced the limitation of standby system networking.

Description of drawings

Fig. 1 is typical wireless network 4 to 1 cold standby system group network structural representations;

Fig. 2 is the method flow diagram that the AP of the embodiment of the invention switches backup AC;

Fig. 3 is the AP structural representation of preferred embodiment of the present invention;

Fig. 4 is the handover module structural representation of the embodiment of the invention;

Fig. 5 is the AC structural representation of preferred embodiment of the present invention;

Fig. 6 is the configuration download module structural representation of preferred embodiment of the present invention.

Embodiment

For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.

The present invention mainly is when professional AC fault, the configuration that the FIT AP that is connected with this business AC is kept download from professional AC rather than configuration abandoned; Connect with backup AC simultaneously, and this configuration is sent to backup AC; Make backup AC can replace professional AC to continue to provide service, realize the AC backup, owing to do not need the configuration of any FIT AP of preservation on backup AC in advance, therefore required in advance configuration amount will significantly reduce, simultaneously, the AC quantity that backup AC can back up will no longer be subjected to the restriction of AC memory capacity, make AC backup networking more flexible.

Still the networking mode with 4 to 1 cold standbys among Fig. 1 is an example, under this application scenarios, and the complete zero configuration of AP, corresponding each coupled AP among the professional AC, all have aly to configuration that should AP, the deploy content of FIT AP is used to indicate FIT AP how to work, and specifically can comprise:

1) physical name of FIT AP and corresponding A P type;

2) priority of FIT AP entity;

3) FIT AP is used to identify the sequence number of uniqueness;

4) radio frequency interface sequence number and mode of operation thereof;

5) service moulding plate of the correspondence under the radio frequency interface (as VLAN and radio-frequency power etc. under the SSID that uses, the user);

6) other relevant configuration.

Above-mentioned concrete configuration content only is the deploy content of FIT AP generally speaking, the concrete configuration content according to different producer's equipment with adopt the different of agreement to have any different.In addition, in order to distinguish backup AC and professional AC, can also dispose the backup Role Information on professional AC and backup AC, can be configured to main (master) on for example professional AC, can be configured on the standby AC from (slave), the concrete sign that adopts is any.Backup Role Information on the professional AC can be incorporated in the configuration of FIT AP, makes FIT AP can know that the AC that is connected is the professional AC of main usefulness or standby backup AC.Certainly, the backup Role Information on the AC can not be configured under the situation that does not back up AC yet, perhaps can provide this backup Role Information as Dynamic Host Configuration Protocol server by other equipment yet.

Professional AC can be issued to the deploy content corresponding with the sequence number of this FIT AP on the FIT AP when receiving the connection request that FIT AP initiates, and at this moment, FIT AP and professional AC connect, and normal wireless network access service can be provided.

But when professional AC fault or network failure, make the interruption that is connected between professional AC and the FIT AP, for example, FIT AP detects the route of professional AC, and unreachable to cause connecting the tunnel overtime, and in the time of can't providing business service, FIT AP will carry out as shown in Figure 2 and operate.Fig. 2 is the method flow diagram that the AP of the embodiment of the invention switches backup AC, comprises the steps:

Step 201 keeps the configuration of downloading from professional AC.

FIT AP will not delete from the configuration that professional AC downloads, but be kept in the local internal memory.

Step 202, AC connects with backup, and described configuration is sent to backup AC.

FIT AP can receive the IP address information of the professional AC and the backup AC of main usefulness after powering up operation, at this moment, FIT AP can connect with backup AC according to the IP address of this backup AC that receives in advance, and the configuration of preserving in the step 201 is sent to backup AC.AC is after the configuration of receiving FIT AP in backup, and this is configured in local the use, for this FIT AP sets up an interim FIT AP entity in this locality, just can replace professional AC to continue business service is provided.

Wherein, connect with backup AC described in the step 202, and issue described configuration, can carry out according to following steps to backup AC:

FIT AP, initiates oppositely to connect to FIT AP after backup AC receives described connection request to backup AC transmission connection request, and by this reverse connection downloading described configuration from FIT AP; After backup AC download configuration is finished, close described reverse connection, respond the connection request that described FIT AP initiates, foundation is connected with the normal forward of FIT AP.

In the prior art, all be to initiate to connect to AC by FIT AP, download configuration from AC, and in embodiments of the present invention, in order to realize that backing up AC initiates to connect and download configuration from FIT AP to FIT AP, can realize by the state machine role of backup AC and FIT AP exchange LWAPP agreement, the for example existing state machine role of FIT AP in the LWAPP agreement is client, the state machine role of AC is a server, and in the present invention, can be converted to role server by making FIT AP, and backup AC is converted to client role, initiate to connect and the identical reverse flow process of flow process of download configuration to professional AC with existing FIT AP thereby make backup AC can under the situation that need not do change, initiate one, make and back up the configuration that AC can obtain this FIT AP from FIT AP existing protocol.Certainly, directly change the agreement flow process, realize that oppositely connection and reverse download configuration also are fine, and repeat no more here.

After backup AC obtains the configuration of FIT AP, can close the reverse connection of foundation, the state machine role who recovers LWAPP is a server, the state machine role that while FIT AP also recovers LWAPP is client, both sides continue to carry out FIT AP in the existing protocol flow process and initiate to connect and the process of download configuration to backup AC, like this for the change minimum of existing standard agreement.Certainly, after backup AC obtained the configuration of FIT AP, backup AC also can only respond the connection request that FIT AP initiates, and foundation is connected with FIT AP's, no longer responds the request of the follow-up download configuration of FIT AP, and business service directly is provided; Perhaps FIT AP no longer carries out from the request of backup AC download configuration; Or FIT AP and backup AC still carry out the operation of download configuration, but can directly discard for the configuration of downloading, and no longer the configuration of self preserving are upgraded.How concrete subsequent step is operated, and can decide according to actual conditions.

In addition, for the FIT AP that will link to each other with backup AC after resuming operation at professional AC switches back on the professional AC, after backup AC and FIT AP connect in step 202, can also further make the detection of backup AC maintenance to professional AC, recover normal if detect professional AC, then instruct FITAP to disconnect and back up being connected of AC, and the professional AC that is linked back again.Particularly, backup AC can as the IP address, survey professional AC according to the address information of the professional AC that uploads from FIT AP, adopts heartbeat message or PING bag to judge whether professional AC recovers; For example send the PING bag to professional AC at certain intervals,, reach 40, judge that then professional AC recovers as the PING bag that can reach continuously is stable if the PING bag can reach continuously; Certainly, specifically criterion can be decided according to the actual requirements.

After judging that professional AC recovers, can make being connected of FIT AP disconnection and backup AC, and connect with professional AC again by address information such as IP address or other instructions that sends professional AC to FIT AP according to this address information.

Under the networking situation that many backup AC are arranged, generally backup AC and professional AC can be divided into a plurality of backup groups, the professional AC in each backup group is backed up by the backup AC of appointment in this backup group, and each backup group uses different backup AC to back up.In this case, FIP AP, professional AC and backup AC need know that the member who oneself belongs to which backup group and can stop other backup groups illegally uses the backup AC of this backup group.

At this situation, a characteristic information that is used to distinguish backup group can be set on professional AC and standby AC, a character string key value for example can be set, professional AC can be when issuing configuration to FIT AP, this key value is incorporated into is handed down to FIT AP in the configuration together, make FIT AP know service groups under own.

At this moment, FIT AP is carrying out AC backup method of the present invention, be before the step 201, can by judging in the configuration that professional AC issues whether comprise this key value, judge that thereby whether existing cold standby environment decision whether to need to carry out in the network follow-uply initiates step of connecting to backup AC, avoids unnecessary operation; For example, if comprise this key value, then execution in step 201 and subsequent step are not follow-uply initiated step of connecting to backup AC otherwise do not carry out.

Certainly, under the situation of having only a backup AC, also can judge whether to exist the cold standby environment by aforesaid backup Role Information; If issuing in the configuration of FIT AP, professional AC promptly comprises aforesaid backup Role Information, also comprise the backup characteristic information, then also can judge whether have the cold standby environment in the network environment or according to the backup Role Information with back up characteristic information and judge jointly, perhaps select one and judge according to the backup Role Information.

In addition, when backup AC receives the connection request of FIT AP initiation, FIT AP can carry the backup characteristic information in the connection request that sends to professional AC, backup AC will judge from the connection request that FIT AP receives, whether carry the backup characteristic information and the backup characteristic information whether identical with the pre-configured backup characteristic information in this locality, if carry backup characteristic information and identical in the described connection request with the pre-configured backup characteristic information in this locality, think that then this request is legal, carry out to FIT AP and initiate oppositely to connect and subsequent step; If the backup characteristic information that does not carry the backup characteristic information in the connection request or carry is different with local pre-configured backup characteristic information, think that then this request is illegal, will not respond, perhaps return error message, thereby can stop the FIT AP of different backup groups illegally to use resource backup.

Wherein, if oppositely connecting the method for the state machine role swap that adopts LWAPP realizes, then the AP sequence number that carries in the reverse connection request that FIT AP initiates with client identity at backup AC need use this backup characteristic information to replace, otherwise stipulate according to existing protocol, FIT AP will think that the sequence number in LWAPP client sequence number of asking download configuration and the configuration of self preserving is not corresponding, configuration distributing can not given backup AC.Certainly, if not adopt swap status machine role's mode to realize reverse connection, but directly revise protocol rule, then can be not limited, and directly issue configuration.

In addition, under the networking situation that the mutually redundant N of professional AC is equipped with than N heat, also can simplify configuration by said method, only under the situation that N is equipped with than N heat, to move two virtual AC examples on the entity A C and realize that heat is equipped with each other, only need to regard an entity A C as two entity A C this moment and get final product, using said method at this moment is identical with N during than 1 cold standby, repeats no more here.

In the prior art, N need dispose local corresponding FIT AP and the configuration of backing up the FITAP of correspondence on the AC fully simultaneously than N heat in professional AC, and the configuration that only needs behind the use said method to preserve the corresponding FIT AP in this locality gets final product, reduced configuration amount, and make FIT AP in the backup procedure more flexible to the selection of backup AC, only need more by the backup characteristic information on the change AC, can finish the distribution of FIT AP backup group, need not to change the configuration that AC goes up the FIT AP of all backup AC correspondences, maintenance is significantly reduced.

Fig. 3 is the AP structural representation of preferred embodiment of the present invention, and this AP can be used for the network environment of similar AC+FIT AP shown in Figure 1, and as shown in Figure 3, this AP comprises:

Fault detection module 301 is used to detect whether fault of the professional AC that is connected with AP;

Module 302 is preserved in configuration, links to each other with described fault detection module, is used for when described fault detection module is judged the professional AC fault that is connected with AP, and reservation is from the configuration of described professional AC download;

Handover module 303, preserve module 302 with described fault detection module 301 and configuration and link to each other respectively, be used for connecting, and described configuration is sent to backup AC with backup AC, make described backup AC according to the described configuration that receives, replace professional AC to continue to provide business service.

Preferably, described AP may further include:

Backup information judge module 304, preserving module 302 with described fault detection module 301, configuration links to each other respectively with handover module 303, be used for when described fault detection module 301 is judged the professional AC fault that is connected with AP, judging from the configuration that professional AC downloads, whether to comprise the backup Role Information in advance and back up characteristic information;

If then instruct described configuration to preserve module 302 and the above-mentioned corresponding step of handover module 303 execution.

Fig. 4 is the handover module structural representation of the embodiment of the invention, and as shown in Figure 4, described handover module comprises:

Connect and set up unit 401, be used for sending connection request, receive the response of backing up AC, set up and back up being connected of AC to backing up AC;

Role transforming unit 402 was set up unit 401 and is linked to each other with described the connection, was used for after described connection is set up the unit and sent described connection request, and the LWAPP protocol state machine role of conversion AP is a server;

The reverse connection set up unit 403, links to each other with described role transforming unit 402, is used to adopt the state machine role of described server to respond the reverse connection request that backup AC initiates, and sets up and reverse connection of backing up between the AC;

Configuration transmitting element 404, with described role transforming unit 402 with oppositely is connected that to set up unit 403 continuous respectively, be used for setting up the reverse connection that unit 403 is set up, adopt the state machine role of described server to send described configuration to backup AC by described reverse connection.

Fig. 5 is the AC structural representation of preferred embodiment of the present invention, and this AC is used for the network environment that AC adds FIT AP as backup AC, and as shown in Figure 5, this AC comprises:

Configuration download module 501, foundation is connected with AP's, and from the AP download configuration;

Configuration application module 502 links to each other with described configuration download module 501, is used to use the configuration of described download that business service is provided.

Preferably, described AP may further include: switchback module 503 links to each other with described configuration application module 502, if detecting professional AC recovers, then instruct AP to disconnect and back up being connected of AC, connect with described professional AC again, stop the business service that described configuration application module 502 provides.

Fig. 6 is the configuration download module structural representation of preferred embodiment of the present invention, and as shown in Figure 6, described configuration download module comprises:

Request receiving element 601 is used to receive the connection request that AP sends;

Role transforming unit 602 links to each other with described request receiving element 601, is used for when described request receiving element 601 receives the connection request that AP sends, and be client with the LWAPP protocol state machine role transforming of AC;

Oppositely connect and set up unit 603, link to each other with role transforming unit 602, be used to adopt the state machine role of described client and described AP to set up reverse connection request with described request receiving element 601;

Configuration download unit 604 was set up unit 603 and is linked to each other with role transforming unit 602 with described reverse the connection, was used for state machine role by described reverse connection employing client from the AP download configuration;

Connect and set up unit 605, link to each other respectively with request receiving element 601 with described configuration download unit 604, be used for after described configuration download unit 604 download configuration are finished, the described connection request foundation that response AP sends is connected with AP's.

Preferably, described configuration download module may further include:

Backup feature judging unit 606, with described request receiving element 601, role transforming unit 602 with oppositely is connected that to set up unit 603 continuous respectively, be used to preserve the backup characteristic information that sets in advance, and judge whether carry the backup characteristic information in the connection request that described request receiving element 601 receives and whether the backup characteristic information is identical with the backup characteristic information of preservation, if carry characteristic information and identical in the described connection request, then instruct walk around unit 602 and oppositely being connected of described role to set up unit 603 and carry out accordingly and operate with the pre-configured characteristic information in this locality.

In the foregoing description among AC, the AP the performed operation in each module and unit and the function of realization can repeat no more here with reference to preceding method embodiment, in addition, use because FAT AP also can be used as FIT AP, therefore above-mentioned AP also can be FAT AP.

By the above embodiments as seen, in AC backup method of the present invention and the system, FIT AP need not download configuration from the Backup AC, therefore need not the configuration at Backup AC storage FIT AP, thereby can significantly reduce the configuration amount of backup AC; In addition, when network changes, only need make amendment to the configuration of professional AC, therefore can reduce the maintenance of whole AC standby system, simultaneously, owing to do not have the configuration capacity requirement on the Backup AC, make Backup AC can be used to back up more professional AC simultaneously, reduced the limitation of standby system networking.Situation for N is equipped with than N heat can reach above-mentioned effect equally.

Institute is understood that; the above is a better embodiment of the present invention only, and is not intended to limit the scope of the invention, and is within the spirit and principles in the present invention all; any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. access point AP switches the method for backup access controller AC in the wireless network, is used for the networking model that AC adds thin access point FITAP, it is characterized in that this method comprises:

When FITAP judges connected professional AC fault, keep the configuration of downloading from described professional AC;

AC connects with backup, and described configuration is sent to backup AC, makes described backup AC use described configuration to replace professional AC to continue to provide business service.

2. AP switches the method for backup AC in the wireless network as claimed in claim 1, it is characterized in that, described and backup AC connects, and described configuration is sent to backup AC, comprising:

FITAP sends connection request to backup AC, after backup AC receives described connection request, initiates oppositely to connect to FITAP, and downloads described configuration by described reverse connection from FIT AP;

After download is finished, close described reverse connection, and respond described connection request, connect with FITAP;

Wherein, described backup AC initiates oppositely to connect to FITAP, and downloads described configuration from FITAP, realizes by the state machine role with FITAP exchange Lightweight Access Point Protocol LWAPP, perhaps realizes by revising the existing protocol flow process.

3. AP switches the method for backup AC in the wireless network as claimed in claim 1, it is characterized in that, after described backup AC and FITAP connect, recover if detect described professional AC, then instruct described FIT AP to disconnect and back up being connected of AC, connect with described professional AC again.

4. switch the method for backup AC as AP in the described wireless network of each claim in the claim 1～3, it is characterized in that, described FITAP comprises backup Role Information and backup characteristic information from the configuration that professional AC downloads; It is described when FITAP judges connected professional AC fault, this method further comprises: FIT AP judges described backup Role Information and the backup characteristic information of whether comprising from the configuration that professional AC downloads, if then FITAP keeps described configuration, and continue to carry out subsequent step.

5. AP switches the method for backup AC in the wireless network as claimed in claim 4, it is characterized in that, described FIT AP carries described backup characteristic information in the connection request that backup AC sends.

6. AP switches the method for backup AC in the wireless network as claimed in claim 5, it is characterized in that, after backup AC receives described connection request, this method further comprises: backup AC judge whether carry the backup characteristic information in the described connection request and the backup characteristic information whether identical with the pre-configured backup characteristic information in this locality, if carry backup characteristic information and identical in the described connection request, then carry out to FITAP and initiate oppositely to connect and subsequent step with the pre-configured backup characteristic information in this locality.

7. an AP is used for the network environment that AC adds FIT AP, it is characterized in that: this AP comprises:

8. AP as claimed in claim 7 is characterized in that, described handover module comprises: connect and set up the unit, be used for sending connection request to backing up AC, receive the response of backing up AC, set up and back up being connected of AC;

The role transforming unit was set up the unit and is linked to each other with described the connection, is used for after described connection is set up the unit and sent described connection request, and be server with the LWAPP state machine role transforming of AP;

The reverse connection set up the unit, links to each other with described role transforming unit, is used to adopt the state machine role of described server to respond the reverse connection request that backup AC initiates, and sets up and reverse connection of backing up between the AC;

The configuration transmitting element with described role transforming unit with oppositely is connected and sets up the unit and link to each other respectively, is used for setting up by described reverse connection the reverse connection of unit foundation, adopts the state machine role of described server that described configuration is sent to and backs up AC.

9. as claim 7 or 8 described AP, it is characterized in that described AP further comprises:

The backup information judge module, preserving module with described fault detection module, configuration links to each other respectively with handover module, be used for when described fault detection module is judged the professional AC fault that is connected with AP, judging from the configuration that professional AC downloads, whether to comprise the backup Role Information in advance and back up characteristic information;

If then instruct described configuration to preserve module and handover module execution corresponding step.

10. an AC is used for the network environment that AC adds FIT AP, it is characterized in that, described AC comprises:

The configuration application module links to each other with described configuration download module, is used to use the configuration of described download that business service is provided;

Wherein, described configuration download module comprises:

The request receiving element is used to receive the connection request that AP sends;

The role transforming unit links to each other with the described request receiving element, is used for when the described request receiving element receives the connection request that AP sends, and be client with the LWAPP protocol state machine role transforming of AC;

Oppositely connect and set up the unit, link to each other with the role transforming unit, be used to adopt the state machine role of described client and described AP to set up reverse connection request with the described request receiving element;

The configuration download unit was set up the unit and is linked to each other with the role transforming unit with described reverse the connection, was used for state machine role by described reverse connection employing client from the AP download configuration;

Connect and set up the unit, link to each other respectively with the request receiving element with described configuration download unit, be used for after described configuration download unit download configuration is finished, the described connection request foundation that response AP sends is connected with AP's.

11. AC as claimed in claim 10 is characterized in that, described configuration download module further comprises:

Backup feature judging unit with described request receiving element, role transforming unit with is connected oppositely that to set up the unit continuous respectively, is used to preserve the backup characteristic information that sets in advance; Judge whether carry the backup characteristic information in the connection request that the described request receiving element receives and whether the backup characteristic information is identical with the described backup characteristic information that sets in advance, if carry characteristic information and identical in the described connection request, then instruct walk around unit and oppositely being connected of described role to set up the unit and carry out accordingly and operate with the pre-configured characteristic information in this locality.

12. as claim 10 or 11 described AC, it is characterized in that, described AP further comprises: the switchback module, link to each other with described configuration application module, if detecting professional AC recovers, then instruct AP to disconnect and back up being connected of AC, connect with described professional AC again, stop the business service that described configuration application module provides.