CN101217440A - An access method and access device of AP to AC in wireless LAN - Google Patents
An access method and access device of AP to AC in wireless LAN Download PDFInfo
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- CN101217440A CN101217440A CNA2008100562200A CN200810056220A CN101217440A CN 101217440 A CN101217440 A CN 101217440A CN A2008100562200 A CNA2008100562200 A CN A2008100562200A CN 200810056220 A CN200810056220 A CN 200810056220A CN 101217440 A CN101217440 A CN 101217440A
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Abstract
The invention provides a method for accessing AP to AC in wireless local area network and access equipment. The method comprises that the AP obtains an AC list from a DHCP server and stores the list; the AP selects an AC from the AC list and is accessed to the AC; when the access fails, the AP selects other ACs from the AC list and carries out the access. According to the invention, the speed of accessing the AP to the AC can be improved effectively.
Description
Technical field
The present invention relates to WLAN (wireless local area network) (Wireless Local Area Network, WLAN) technology, (Access Point AP) inserts access controller (AccessController, method AC) and access device particularly to relate to access point in a kind of WLAN (wireless local area network).
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.
(Control and Provisioning of Wireless AccessPoints CAPWAP) has defined the integral WLAN framework in the agreement, described the division of WLAN function on AP equipment and AC equipment for existing wireless access point control and regulation.In integral WLAN, after powering on, AP needs to seek earlier AC, connect with AC then.If AC is interconnected with two layers of AP, then can find AC by the L 2 broadcast message; If AC is interconnected with three layers of AP, then need (Dynamic Host Configuration Protocol DHCP) obtains the information of AC by other agreements such as DHCP.
As shown in Figure 1, existing wlan system comprises: access point AP, access controller AC, Dynamic Host Configuration Protocol server, and the detailed process that access point AP inserts access controller AC is as follows:
Step 101, AP are obtained self IP address, dns server, domain name, AC tabulation from Dynamic Host Configuration Protocol server;
AP is with OPTION 60 fields when sending DHCP discovery message; Dynamic Host Configuration Protocol server is being received the DHCP offer message of replying band OPTION 43 after OPTION is 60 DHCP discovery message, comprise AC tabulation in this message, this AC tabulation is the IP address list of the AC of Gong the access of disposing on Dynamic Host Configuration Protocol server in advance.
The AC that step 102, AP send L 2 broadcast finds request message;
Step 103, AP judge whether to receive that the AC that AC sends finds response message, if receive, then execution in step 106, otherwise, execution in step 104;
Step 104, AP select an AC according to the algorithm of oneself from the AC tabulation, the AC that sends clean culture to this AC finds request message;
Step 105, receive AC and find the AC of request message checks whether this AP has the authority of this machine of access, if then respond AC and find response message;
Step 106, AP are from AC download version and configuration information;
Step 107, AP begin operate as normal and AC exchanging user data message.
In above-mentioned access procedure, if AP inserts the AC failure, perhaps insert the communication disruption (for example, AC breaks down) of back and AC, need re-execute from the access process of step 101 beginning; In addition, do not have information sharing between the AC, when AP inserts, all need again download version and configuration information at every turn, it is slow that these have all caused AP to insert the speed of AC, and the switch speed of AC after breaking down is slow.
Summary of the invention
Technical problem to be solved by this invention provides method and the access device of AP access AC in a kind of WLAN (wireless local area network), to improve the speed that AP inserts AC.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
AP inserts the method for AC in a kind of WLAN (wireless local area network), comprising:
AP obtains AC tabulation and preservation from Dynamic Host Configuration Protocol server;
AP selects an AC to insert from the AC tabulation of preserving, and when access failure, selects other AC to insert from described AC tabulation.
Above-mentioned method wherein, also comprises: have no progeny in being connected of AP and AC, select other AC to insert from the AC tabulation of preserving.
Above-mentioned method, wherein, AP also sends to the AC tabulation of preserving the AC of access when inserting AC; The AC of described access also preserves the AP information that inserts it and described AC tabulation, and with described AP information synchronization other AC in the described AC tabulation, wherein, described AP information comprises IP address and corresponding version and the configuration information of AP.
Above-mentioned method wherein, is also periodically carried out described AP information between the AC synchronously.
Above-mentioned method wherein, is had no progeny in being connected of AP and AC, and when selecting other AC to insert from described AC tabulation, also finds to carry current version of AP and configuration information in the request message at AC; AC is after receiving described AC discovery request message, also the current version of described AP and configuration information and local AP information of preserving are compared, and when determining that current version of described AP and configuration information are consistent with local AP information of preserving, indication AP does not need to carry out version and configuration information is downloaded, and directly communicates between AP and the AC.
A kind of AP comprises AC tabulation acquisition module and selects access module, wherein:
Described AC tabulation acquisition module is used for obtaining AC tabulation and preservation from Dynamic Host Configuration Protocol server;
Described selection access module is used for selecting an AC to insert from the AC tabulation of preserving, and when access failure, selects other AC to insert from described AC tabulation.
Above-mentioned AP, wherein, described selection access module also is used for, and has no progeny in being connected of AP and AC, and selects other AC to insert from the AC tabulation of preserving.
Above-mentioned AP wherein, comprises also in the described selection access module that the AC tabulation sends submodule, is used for when AP inserts AC, the AC tabulation of preserving is sent to the AC of access.
Above-mentioned AP wherein, comprises also in the described selection access module that AP information sends submodule, is used for having no progeny with being connected of AC at AP, and when selecting other AC to insert from described AC tabulation, version and configuration information that AP is current send to AC.
A kind of AC comprises AC tabulation receiver module and synchronization module, wherein:
Described AC tabulation receiver module is used to receive AC tabulation and the preservation that AP sends;
Described synchronization module is used for the AP information that inserts this AC is preserved, and with described AP information synchronization other AC in the described AC tabulation.
Above-mentioned AP, wherein, also comprise authentication module, described authentication module is used for when AP inserts this AC, receive current version and configuration information that AP sends, itself and local AP information of preserving are compared, and when determining that current version of described AP and configuration information are consistent with local AP information of preserving, indication AP does not need to carry out version and configuration information is downloaded, wherein, described AP information comprises IP address and corresponding version and the configuration information of AP.
The present invention is by preserving the AC tabulation that gets access to from Dynamic Host Configuration Protocol server, like this when access failure or AC break down, can be immediately from the AC tabulation, select another one AC to insert, improved the speed that inserts and AP failover speed to AC.Further, among the present invention, between the AC AP information is carried out synchronously, when AP inserts again, do not need at every turn all download version and configuration information, this has further improved access speed and failover speed.
Description of drawings
Fig. 1 is the flow chart that AP inserts AC in the prior art;
Fig. 2 is the flow chart that the AP of the specific embodiment of the invention inserts AC;
Fig. 3 is the structural representation of the AP of the specific embodiment of the invention;
Fig. 4 is the structural representation of the AC of the specific embodiment of the invention.
Embodiment
In specific embodiments of the invention, AP to the AC that gets access to from Dynamic Host Configuration Protocol server tabulation preserve, when access failure or AC broke down, AP selected other AC to insert again from the AC tabulation of preserving.In another specific embodiment of the present invention, also communicate between each AC, version and the configuration information of the local AP that preserves of announcement make that the AP information between each AC keeps synchronously; AP finds also to carry version and configuration information in the request message at the AC that sends, and is judged by AC, and indication AP whether needs to carry out version and configuration information is downloaded.
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.
Please refer to Fig. 2, the AP of the specific embodiment of the invention inserts the method for AC, mainly comprises the steps:
Step 201, AP obtain AC tabulation and preservation from Dynamic Host Configuration Protocol server;
AP is with OPTION 60 fields when sending DHCP discovery message; Dynamic Host Configuration Protocol server is being received the DHCP offer message of replying band OPTION 43 after OPTION is 60 DHCP discovery message, comprise AC tabulation in this message, this AC tabulation is the IP address list of the AC of Gong the access of disposing on Dynamic Host Configuration Protocol server in advance.
Step 202, AP are selected an AC according to the algorithm of oneself from the AC tabulation, AC1 for example, and find request message to the AC that AC1 sends clean culture;
In this step, AP finds also to carry the AC list information in the request message at the AC that sends, and AC1 preserves described AC list information.
Step 203, receive AC and find the AC1 of request message checks whether this AP has the authority of this machine of access, if then respond AC and find response message;
AP does not find response message if receive AC in the given time, then returns step 202, reselects another one AC and inserts.
Step 204, AP are from AC1 download version and configuration information;
After version and configuration information were downloaded successfully, AC1 also preserved the AP information that inserts it, and described AP information comprises IP address and corresponding version and the configuration information of AP.
Step 205, AP insert successfully, and beginning operate as normal and AC1 exchanging user data message carry out user data delivery.
Step 206, AC1 other AC (for example AC2) in the AC tabulation sends AC and finds request message, carries described AC tabulation in this request message, and to be provided with in this request message that field specifies oneself be AC;
Step 207, AC2 preserve described AC tabulation, respond AC to AC1 and find response message;
Step 208, AC2 download AP information from AC1, comprise IP address and corresponding version and the configuration information of AP;
In addition, can also periodically carry out synchronously described AP information between AC1 and the AC2, for example, can be provided with 10 minutes and carry out one subsynchronous, promptly AC2 just downloaded version and the configuration information of an AP from AC1 every 10 minutes.
Step 209, AP (for example are connected interruption with AC1's, communication disruption) after, AP reselects a new AC and inserts in the AC of its preservation tabulation, for example select AC2 to insert, and AP finds also to carry current version of AP and configuration information in the request message at the AC that sends to AC2;
Step 210, AC2 are receiving that the AC that AP sends finds to compare behind the request message, and (1) then issues version and configuration information to this AP again if this AP does not exist version and configuration information in the AP information that oneself writes down; (2) if this AP exists version and configuration information in the AP of the record of oneself information, and this version and configuration information are identical with configuration information with version in this request message, then do not need to issue version and configuration information to AP again; (3) if this AP exists version and configuration information in the AP of the record of oneself information, and this version is different with configuration information with the version in this request message with configuration information, then needs to issue version and configuration information to AP
Step 211, AC2 respond AC to AP and find response message, and indication AP whether needs to carry out version and configuration information is downloaded;
Step 212, carry out version and configuration information if desired and download, initiated to ask for instructions to download by AP, if do not need to download, then AP and AC directly communicate.
In the cut-in method of another specific embodiment of the present invention, the AC of a plurality of redundancies can keep the consistency of version and configuration, also can keep the consistency of version, needs AC to support two cover or above version and configurations at least like this; One of them AC needs the AP information of regular noticing and registering (can be set to 10 minutes) on own between the AC, so that can switch on another AC after breaking down apace.
Please refer to Fig. 3, the AP of the specific embodiment of the invention comprises AC tabulation acquisition module and selects access module.
AC tabulation acquisition module is used for obtaining AC tabulation and preservation from Dynamic Host Configuration Protocol server; Select access module to be used for selecting an AC to insert, when access failure, from described AC tabulation, select other AC to insert from the AC tabulation of preserving.Select access module also to be used for, have no progeny in being connected of AP and AC, other AC of selection inserts from the AC tabulation of preserving.
Select also to comprise in the access module that the AC tabulation sends submodule, be used for when AP inserts AC, the AC tabulation of preserving is sent to the AC of access.
Select also to comprise in the access module that AP information sends submodule, be used for having no progeny with being connected of AC that when selecting other AC to insert, version and configuration information that AP is current send to AC from described AC tabulation at AP.
Please refer to Fig. 4, the AC of the specific embodiment of the invention comprises AC tabulation receiver module, synchronization module and authentication module.
The AC receiver module of tabulating is used to receive the AC tabulation that AP sends and preserves;
Synchronization module is used for the AP information that inserts this AC is preserved, and with described AP information synchronization other AC in the described AC tabulation, wherein, described AP information comprises IP address and corresponding version and the configuration information of AP.Synchronization module can also periodically carry out described AP information synchronously.
Authentication module, be used for when AP inserts this AC, receive current version and configuration information that AP sends, itself and local AP information of preserving are compared, and when determining that current version of described AP and configuration information are consistent with local AP information of preserving, indication AP does not need to carry out version and configuration information is downloaded.
Concrete communication process repeats no more referring to the description of step among Fig. 2 between Fig. 3 and AP shown in Figure 4 and the AC.
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 (11)
1. AP inserts the method for AC in the WLAN (wireless local area network), it is characterized in that, comprising:
AP obtains AC tabulation and preservation from Dynamic Host Configuration Protocol server;
AP selects an AC to insert from the AC tabulation of preserving, and when access failure, selects other AC to insert from described AC tabulation.
2. the method for claim 1 is characterized in that, also comprises:
Have no progeny in being connected of AP and AC, from the AC tabulation of preserving, select other AC to insert.
3. method as claimed in claim 1 or 2 is characterized in that:
AP also sends to the AC tabulation of preserving the AC of access when inserting AC;
The AC of described access also preserves the AP information that inserts it and described AC tabulation, and with described AP information synchronization other AC in the described AC tabulation, wherein, described AP information comprises IP address and corresponding version and the configuration information of AP.
4. method as claimed in claim 3 is characterized in that:
Also periodically described AP information is carried out synchronously between the AC.
5. method as claimed in claim 3 is characterized in that:
Have no progeny in being connected of AP and AC, when from described AC tabulation, selecting other AC to insert, also find to carry current version of AP and configuration information in the request message at AC;
AC is after receiving described AC discovery request message, also the current version of described AP and configuration information and local AP information of preserving are compared, and when determining that current version of described AP and configuration information are consistent with local AP information of preserving, indication AP does not need to carry out version and configuration information is downloaded, and directly communicates between AP and the AC.
6. an AP is characterized in that, comprise AC tabulation acquisition module and select access module, wherein:
Described AC tabulation acquisition module is used for obtaining AC tabulation and preservation from Dynamic Host Configuration Protocol server;
Described selection access module is used for selecting an AC to insert from the AC tabulation of preserving, and when access failure, selects other AC to insert from described AC tabulation.
7. AP as claimed in claim 6 is characterized in that:
Described selection access module also is used for, and has no progeny in being connected of AP and AC, and selects other AC to insert from the AC tabulation of preserving.
8. as claim 6 or 7 described AP, it is characterized in that:
Comprise also in the described selection access module that the AC tabulation sends submodule, be used for when AP inserts AC, the AC tabulation of preserving is sent to the AC of access.
9. as claim 6 or 7 described AP, it is characterized in that:
Comprise also in the described selection access module that AP information sends submodule, be used for having no progeny with being connected of AC that when selecting other AC to insert, version and configuration information that AP is current send to AC from described AC tabulation at AP.
10. an AC is characterized in that, comprises AC tabulation receiver module and synchronization module, wherein:
Described AC tabulation receiver module is used to receive AC tabulation and the preservation that AP sends;
Described synchronization module is used for the AP information that inserts this AC is preserved, and with described AP information synchronization other AC in the described AC tabulation.
11. AC as claimed in claim 10 is characterized in that: also comprise authentication module,
Described authentication module, be used for when AP inserts this AC, receive current version and configuration information that AP sends, itself and local AP information of preserving are compared, and when determining that current version of described AP and configuration information are consistent with local AP information of preserving, indication AP does not need to carry out version and configuration information is downloaded, and wherein, described AP information comprises IP address and corresponding version and the configuration information of AP.
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| CN2008100562200A CN101217440B (en) | 2008-01-15 | 2008-01-15 | An access method and access device of AP to AC in wireless LAN |
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| CN111683382A (en) * | 2020-05-20 | 2020-09-18 | 新华三技术有限公司 | Configuration information synchronization method and device |
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