CN1913475A - Method and system for expanding 802.11 radio local network - Google Patents
Method and system for expanding 802.11 radio local network Download PDFInfo
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Abstract
This invention provides a method and a system for expanding 802.11 WLAN, in which, the method includes: appointing an access control server in a WLAN, an access controller registers and authenticates its identity to said server, which stores the information of the controller, a control tunnel and a two-layer data tunnel are set up between the controller and the server and the WLAN realizes star-state expansion, in this way, multiple access controllers can set up an unified WLAN so as to expand 802.11 WLAN and realize that the working stations can roam seamlessly and quickly in the net based on said WLAN and a method of data re-direction and transmission.
Description
Technical field
The present invention relates generally to the transmission of digital information, relate in particular to by setting up access controller (AC, Access Controller) method and system based on the WLAN (wireless local area network) of 802.11 standards (WLAN, Wireless Local Area Network) are expanded in the connection between.
Background technology
IEEE (IEEE) the 802.11st, one of first generation WLAN standard.This standard definition physical layer and media interviews controls (Media Access Control, the MAC) standard of agreement allow WLAN (wireless local area network) and radio equipment manufacturer to set up mutual operation network equipment within the specific limits.This standard is mainly used in the wireless access of the user terminal that solves office's local area network (LAN) and campus network.
According to above-mentioned agreement, in WLAN (wireless local area network), at the user of wireless terminal device, particularly the kneetop computer user as long as its terminal equipment meets and supports 802.11 agreements, can login in any place in the WLAN (wireless local area network) of commercial operation.In this case, this user can measure a large amount of WLAN (wireless local area network) by its terminal equipment, wherein each a large amount of WLAN (wireless local area network) comprise access point (AP, AccessPoint).Access point is a wireless transmitting-receiving equipments, and it will become wireless signal to send to wireless device users from the data transaction that cable network (for example the Internet) receives, and will convert data to from the wireless signal that wireless device users receives and be transmitted to cable network.Can make the user insert other data network by this access point, particularly insert the Internet.
Centralized Wireless LAN comprises access point and access controller (AC, Access Controller), wherein access controller provides the centralized management of WLAN (wireless local area network), and access point then adds WLAN (wireless local area network) by setting up to link with access controller, and the wireless access service then is provided.
The centralized management of Centralized Wireless LAN is a kind of trend that develops rapidly.When adopting centralized management, a WLAN devices (as switch, special equipment or router) is used to many access points and creates and implementation strategy.At this development trend, on the basis of coordinating with IEEE802.11, IETF (the Internet engineering duty group) develops CAPWAP (Control and Provisioning of WirelessAccess Points, wireless access point control and maintenance) method, be used to describe employed interface of various WLAN (wireless local area network) management equipments and agreement, and realize the control and the machine-processed criteria for classificationization of programming of WAP (wireless access point).Wherein, CAPWAP has defined the communication protocol between access point and the access controller, and the control and management function of access point, the centralized management function of Radio Access Network, the centralized control and the management function of wireless access subscriber are provided.
The network of CAPWAP management is made of a plurality of access points that are connected by double layer network (Ethernet) or three-layer network (IP) on the access controller.Access controller is generally WLAN (wireless local area network) special equipment or wireless local network switch.When using CAPWAP, in fact access point becomes the remote radio frequency interface that no longer comprises all mandatory wireless disposal abilities, and is controlled by access controller.CAPWAP is by definition following steps, the intercommunication mutually of management access point and access controller.
Access point apparatus is found and authentication: when access point was inserted in the wireless network, it utilized CAPWAP to find spendable access controller.When this access point is access in controller and proves the effective network equipment, this access point and valid wireless LAN switch/special equipment opening relationships.
Access-in point information exchange, configuration and software control: access point utilizes the recent software upgrading and utilizes wireless local area network (WLAN) system information (sign, channel allocation and security parameter being set as service) to be configured.
Control on Communication and management between access point and the wireless system equipment: CAPWAP handles packet encapsulation, segmentation and the format that transmits data between access point and the access controller.
Fig. 1 uses the networking schematic diagram for the prior art of the WLAN service that an access controller and three access points provide.As shown in Figure 1, access controller AC1 manages the wireless access service of this WLAN (wireless local area network) concentratedly, when access point AP1, AP2 and AP3 respectively with access controller AC1 successfully connect add this WLAN (wireless local area network) after, described access point obtains response respectively on AC1 service configuration provides the WLAN (wireless local area network) access service.Therefore, the wireless access service of this WLAN (wireless local area network) can provide on a plurality of access points simultaneously, and the wireless access service of this WLAN (wireless local area network) can be supported a plurality of users' accesses, for example STA1 and STA2 simultaneously.
But, in actual applications, the wireless access service of a WLAN (wireless local area network) usually needs a plurality of access controllers just may satisfy the demands, and for example the prior art of the WLAN service that provides for two access controllers and four access points of Fig. 2 is used the networking schematic diagram.Wherein, access controller AC1 management access point AP1 and AP2 provide the wireless access service; Access controller AC2 management access point AP3 and AP4 provide the wireless access service, and wireless user STA1, STA2 pass through different access points respectively with STA3, insert AC1 and AC2, thereby insert fixed network FN.
As mentioned above, because have mutual independence between each access controller in this WLAN (wireless local area network), there is following defective in this WLAN (wireless local area network):
Defective one: as shown in Figure 2, access controller AC1 and AC2 manage its access point independently, the wireless access service independently is provided, make a theoretic WLAN (wireless local area network) be actually two fully independently WLAN (wireless local area network), communicate and have only between access controller AC1 and the AC2, a wireless access service of merging unified WLAN (wireless local area network) can't be provided by fixed network FN.
Defective two: when work station is moved, can't between access point, realize seamless roam.As shown in Figure 2, when work station STA2 inserted by access point AP2, all authentication informations, access information were all safeguarded on access controller AC1.When work station STA2 finds that the wireless access service that the signal of access point AP3 provides is better than access point AP2, work station STA2 will switch to access point AP3 and insert.But the access user profile of all working station STA2 is all preserved on access controller AC1, access controller AC2 can't determine that the user is the roamer, work station STA2 also the access of work station STA2 can't be redirected on the access controller AC1 and handle, so must carry out just can being linked into WLAN (wireless local area network) again behind all access authentications with access controller AC2 again.Yet access authentication procedure often needs the long time, so the WLAN (wireless local area network) access service can't guarantee that work station STA2 application service is uninterrupted, and seamless fast roaming that just can't support performance station STA2.
Summary of the invention
In view of the above problems, the objective of the invention is to: first, a kind of 802.11 WLAN (wireless local area network) of expansion are provided, this WLAN (wireless local area network) realizes that by the method that dynamic registration, dynamic negotiation make up the access controller connection a plurality of access controllers dynamically connect, thereby realizes that a plurality of access controllers make up the unified WLAN (wireless local area network) of fusion; The second, the method that provides a kind of data redirection to transmit, this method is unified WLAN (wireless local area network) based on the fusion that these a plurality of access controllers make up, and realizes the seamless fast roaming of work station.
In order to realize first purpose of the present invention, according to a preferred embodiment of the present invention, the invention provides a kind of method of expansion 802.11 WLAN (wireless local area network), this method may further comprise the steps:
A., an access controller server is set in WLAN (wireless local area network);
B. access controller is to this access controller server registration and carry out authentication, and preserved the log-on message of this access controller by this access controller server;
C. set up control tunnel and Layer 2 data tunnel between this access controller and this access controller server, then WLAN (wireless local area network) realizes starlike expansion.
Technical conceive according to a preferred embodiment of the invention, wherein in the steps A, this access controller server itself can be access controller.
Technical conceive according to a preferred embodiment of the invention, wherein before the step B, this access controller perhaps obtains the information of this access controller server by the information of this access controller server of configuration acquisition by broadcast request.
Technical conceive according to a preferred embodiment of the invention; wherein among the step C; after setting up the control tunnel between this access controller and this access controller server, this access controller and this access controller server can be safeguarded the control tunnel by the keep-alive message.
In order to realize first purpose of the present invention, according to a preferred embodiment of the present invention, the invention provides a kind of 802.11 WLAN (wireless local area network) of expansion, comprise at least two access controllers, this WLAN (wireless local area network) further comprises an access controller server, wherein establishes control tunnel and Layer 2 data tunnel between described access controller and this access controller server.
Technical conceive according to a preferred embodiment of the invention, wherein the user can specify this access controller server by configuration.
Technical conceive according to a preferred embodiment of the invention, wherein this access controller server itself can be access controller.
The advantage of said method of the present invention and system is that an interior access controller server centered of local area network (LAN) is managed a plurality of access controllers, merges unified starlike WLAN (wireless local area network) and 802.11 wider WLAN service are provided thereby make up.
In order to realize the object of the invention, according to another preferred embodiment of the invention, the invention provides the method that another expands 802.11 WLAN (wireless local area network), this method may further comprise the steps:
A., the access controller server is set in WLAN (wireless local area network);
B. access controller is to this access controller server registration and carry out authentication, and preserved the log-on message of this access controller by this access controller server;
C. between this access controller and this access controller server, set up the control tunnel;
D. this access controller server sends the information of other registered access controllers to this access controller;
E. described registered access controller is being set up control tunnel and Layer 2 data tunnel each other, and then WLAN (wireless local area network) realizes netted expansion.
Technical conceive according to another preferred embodiment of the invention, wherein in the steps A, this access controller server itself can be access controller.
Technical conceive according to another preferred embodiment of the invention, wherein before the step B, this access controller perhaps obtains the information of this access controller server by the information of this access controller server of configuration acquisition by broadcast request.
Technical conceive according to another preferred embodiment of the invention, wherein among the step B, this access controller comprises the address information of this access controller to the log-on message of this access controller server registration.
Technical conceive according to another preferred embodiment of the invention; wherein among the step C; after setting up the control tunnel between this access controller and this access controller server, this access controller and this access controller server can be safeguarded the control tunnel by the keep-alive message.
Technical conceive according to another preferred embodiment of the invention wherein among the step C, is set up the Layer 2 data tunnel between this access controller and this access controller server.
Technical conceive according to another preferred embodiment of the invention, wherein among the step D, this access controller server can initiatively send the information of other access controllers to this access controller, perhaps this access controller also can be dynamically to the information of these other access controllers of access controller server lookup.
In order to realize the object of the invention, according to another preferred embodiment of the invention, the invention provides a kind of 802.11 WLAN (wireless local area network) of expansion, comprise at least two access controllers, this WLAN (wireless local area network) further is included in an appointment access controller server in the WLAN (wireless local area network), wherein between described access controller and this access controller server, establish the control tunnel, and between described access controller, establish dynamic control tunnel and Layer 2 data tunnel.
Technical conceive according to another preferred embodiment of the invention, wherein this access controller server itself can be access controller.
Technical conceive according to another preferred embodiment of the invention establishes the Layer 2 data tunnel between wherein said access controller and this access controller server.
The advantage of said method of the present invention and system is that the interior a plurality of access controllers of local area network (LAN) connect mutually, merge unified meshed wireless local area network (LAN) and 802.11 wider WLAN service are provided thereby make up.
In order to realize second purpose of the present invention, according to a preferred embodiment of the present invention, the invention provides the method that a kind of data redirection is transmitted, be applied to 802.11 WLAN (wireless local area network) of above-mentioned expansion, this method may further comprise the steps:
A. work station moves between the access point of former access controller and existing access controller control, sets up wireless link by 802.11 WLAN (wireless local area network) and the new access point that is somebody's turn to do existing access controller control of above-mentioned expansion;
B. the former access controller of this work station and existing access controller by and this access controller server between the information of mutual this work station in control tunnel;
C. according to the information of data source end and destination, this former access controller and should existing access controller by and this access controller server between the Layer 2 data tunnel each other with message redirecting;
D. access controller be forwarded to destination to message with being somebody's turn to do now by this former access controller after being redirected.
Technical conceive according to a preferred embodiment of the invention, wherein this former access controller with the concrete steps of being somebody's turn to do mutual this work station information of existing access controller is among the step B:
A. now access controller sends the request of the historical information of this work station of inquiry simultaneously to the current information of this this work station of access controller server notification to this access controller server;
B. after this access controller server was received the notice and request that this existing access controller sends, this former access controller of current information notice with this work station sent response simultaneously the historical information of this work station is informed this existing access controller.
The advantage of said method of the present invention is, based on merging unified starlike WLAN (wireless local area network), access controller is by realizing data redirection with the Layer 2 data tunnel of access controller server foundation, and work station can be realized seamless roam between the access controller in this WLAN (wireless local area network) thus.
In order to realize second purpose of the present invention, according to another preferred embodiment of the invention, the invention provides the method that a kind of data redirection is transmitted, be applied to 802.11 WLAN (wireless local area network) of above-mentioned expansion, this method may further comprise the steps:
A. work station moves between the access point of former access controller and existing access controller control, sets up wireless link by 802.11 WLAN (wireless local area network) and the new access point that is somebody's turn to do existing access controller control of above-mentioned expansion;
B. the former access controller of this work station and existing access controller pass through the information of mutual this work station in control tunnel each other;
C. according to the information of data source end and destination, former access controller and the existing access controller Layer 2 data tunnel by each other is each other with message redirecting;
D. access controller be forwarded to destination to message with being somebody's turn to do now by this former access controller after being redirected.
Technical conceive according to another preferred embodiment of the invention, wherein this former access controller with the concrete steps of being somebody's turn to do mutual this work station information of existing access controller is among the step B:
A. now access controller sends the request of the historical information of this work station of inquiry simultaneously to the work at present information of wireless local area networks broadcast notice work station;
B. after this former access controller is received the notice and request that this existing access controller sends, then learn the current information of this work station, send response simultaneously the historical information of this work station is informed this existing access controller.
The advantage of said method of the present invention is, based on merging unified meshed wireless local area network (LAN), access controller is realized data redirection by the Layer 2 data tunnel of setting up each other, and work station can be realized seamless roam between the access controller in this WLAN (wireless local area network) thus.
Description of drawings
Fig. 1 uses the networking schematic diagram for the prior art of the WLAN service that an access controller and three access points provide;
Fig. 2 uses the networking schematic diagram for the prior art of the WLAN service that two access controllers and four access points provide;
Fig. 3 makes up the application networking schematic diagram of the unified WLAN (wireless local area network) of starlike fusion for a plurality of access controllers;
Fig. 4 makes up the flow chart of steps that WLAN (wireless local area network) is unified in starlike fusion for a plurality of access controllers;
Fig. 5 makes up the application networking schematic diagram of the unified WLAN (wireless local area network) of netted fusion for a plurality of access controllers;
Fig. 6 makes up the flow chart of steps that WLAN (wireless local area network) is unified in netted fusion for a plurality of access controllers;
Fig. 7 is that wireless stations data redirection in starlike WLAN (wireless local area network) is transmitted the schematic diagram of realizing seamless fast roaming;
Fig. 8 transmits the flow chart of steps that realize seamless fast roaming with data redirection for wireless stations in starlike WLAN (wireless local area network);
Fig. 9 transmits the schematic diagram of realizing seamless fast roaming with data redirection for wireless stations in the meshed wireless local area network (LAN);
Figure 10 is that wireless stations data redirection in the meshed wireless local area network (LAN) is transmitted the flow chart of steps that realizes seamless fast roaming.
Embodiment
First embodiment
In the first embodiment of the present invention, an access controller server centered is managed a plurality of access controllers and is made up a starlike WLAN (wireless local area network), sets up control tunnel and Layer 2 data tunnel to access controller server dynamic registration and between access controller and access controller server by access controller and reaches the purpose that makes up fusion unification WLAN (wireless local area network).The following detailed process that first embodiment of the invention is described with reference to Fig. 3 and Fig. 4.
Step 1: in the WLAN (wireless local area network) that a plurality of access controllers are formed, specify access controller server A C Server, be used for managing concentratedly the access controller AC1 and the AC2 of this WLAN (wireless local area network), this access controller server A C Server itself can be access controller, also can be other network equipments.
Step 2: when an access controller AC1 or AC2 bring into operation or insert this WLAN (wireless local area network), this access controller is to the access controller server registration and carry out authentication, the access controller that only succeeds in registration just can join in the WLAN (wireless local area network) under this access controller server maintenance, and the access controller server is preserved the log-on message of access controller simultaneously.
Step 3: access controller is after succeeding in registration, based on the log-on message of access controller to the transmission of access controller server, each access controller AC1 and AC2 have set up control tunnel and Layer 2 data tunnel with access controller server A C Server respectively, connection as shown in Figure 3 (1) and (2) are so access controller and access controller server are built into the unified WLAN (wireless local area network) of starlike fusion.
Preferably, access controller can obtain the relevant information of access controller server by configuration when the access controller server registration in step 2, and perhaps access controller obtains the relevant information of access controller server by broadcast request.
Preferably, in step 2, according to the host-host protocol difference that the tunnel adopted between access controller and the access controller server, the access controller server is preserved the log-on message of different access controllers, for example the tunnel between access controller adopts User Datagram Protoco (UDP) (UDP, User DatagramProtocol) as host-host protocol, then the access controller server need be preserved the IP address and the port numbers of each access controller.
Preferably, after setting up the control tunnel between access controller and the access controller server, the information of the access controller that the access controller server can have been registered other each sends to the log-on message of this new access controller, in addition, access controller can also dynamic information to other access controllers of access controller server lookup.
Preferably, after setting up the control tunnel between access controller and the access controller server, all control informations are all transmitted by the control tunnel.Access controller and access controller server can be safeguarded the control tunnel by the keep-alive message, and whether detection control tunnel is in normal operating conditions.
Second embodiment
In the second embodiment of the present invention, access controller server centered is managed a plurality of access controllers and is made up a meshed wireless local area network (LAN), reaches and makes up the purpose that merges the unification WLAN (wireless local area network) to access controller server dynamic registration and setting up control tunnel and Layer 2 data tunnel between access controller and the access controller server and between each access controller by access controller.The following detailed process that second embodiment of the invention is described with reference to Fig. 5 and Fig. 6.
Step 1: in the WLAN (wireless local area network) that a plurality of access controllers are formed, specify access controller server A C Server, be used for managing concentratedly the access controller of this WLAN (wireless local area network), this access controller server itself can be access controller, also can be other network equipments.
Step 2: when an access controller AC1 or AC2 bring into operation or insert this WLAN (wireless local area network), this access controller is to the access controller server registration and carry out authentication, the access controller that only succeeds in registration just can join in the WLAN (wireless local area network) under this access controller server maintenance, and the access controller server is preserved the log-on message of access controller simultaneously.
Step 3: access controller is after succeeding in registration, based on the log-on message of access controller to the transmission of access controller server, each access controller AC1 and AC2 have set up the control tunnel with access controller server A C Server respectively, connection as shown in Figure 5 (1) and (2).
Step 4: successful after the access controller server is registered at this access controller, the information of the access controller that access controller server A C Server has registered other each sends to the log-on message of this new access controller, in addition, access controller AC1 or the AC2 information that can also inquire about other access controllers to access controller server A C Server dynamically.
Step 5: set up on the basis in control tunnel and Layer 2 data tunnel with access controller server A C Server respectively at access controller AC1 and AC2, access controller AC1 and AC2 are setting up control tunnel and Layer 2 data tunnel to each other according to the other side's who obtains log-on message in step 4, connection as shown in Figure 5 (3) is so access controller makes up the unified WLAN (wireless local area network) of webbed fusion.
Preferably, access controller can obtain the relevant information of access controller server by configuration when the access controller server registration in step 2, and perhaps access controller obtains the relevant information of access controller server by broadcast request.
Preferably, in step 2, according between access controller and the access controller server and the agreement difference that the tunnel adopted between the access controller, the access controller server is preserved the log-on message of different access controllers, for example, for example as host-host protocol, then the access controller server need be preserved the IP address and the port numbers of each access controller to the employing User Datagram Protoco (UDP) of the tunnel between access controller (UDP, User Datagram Protocol).
Preferably, after setting up the control tunnel between access controller and the access controller server and between the access controller, all control informations are all transmitted by the control tunnel.Access controller and access controller server can be safeguarded the control tunnel by the keep-alive message, and whether detection control tunnel is in normal operating conditions.
Preferably, in step 3, under this situation as access controller of access controller server, access controller AC1 and AC2 also will set up the Layer 2 data tunnel except setting up the control tunnel with access controller server A C Server respectively.
The 3rd embodiment
In the third embodiment of the present invention, based on the unified WLAN (wireless local area network) of in first embodiment, setting up of starlike fusion, work station by the redirected forwarding in the Layer 2 data tunnel of data message between access controller, reaches the purpose of work station seamless roam in moving process.The following detailed process that third embodiment of the invention is described with reference to Fig. 7 and Fig. 8.
Step 1: as shown in Figure 7, access controller AC1 and AC2 successfully set up Layer 2 data tunnel DT1 and DT2 with access controller server A C Server respectively; Work station PC1 and access controller AC1 and AC2 are in same double layer network.Work station STA1 with the management of access controller AC1 under wireless access point AP 1 successfully set up wireless connections, thereby work station STA1 can carry out double layered communication with PC1.
Because work station STA1 is moved, access point AP2 can provide better wireless access service under the management of discovery access controller AC2, work station STA1 and access controller AC2 set up wireless connections, thereby finish the roaming from access point AP1 to access point AP2.
Step 2: because access controller AC1 and AC2 are in the unified WLAN (wireless local area network) of same starlike fusion, then access controller AC1 and AC2 obtain the information of work station STA1 respectively by it with the control tunnel of access controller server A CServer, be that access controller AC1 can obtain the current information by access controller AC2 access WLAN (wireless local area network) of work station STA1, access controller AC2 can determine that also work station STA1 inserted this WLAN (wireless local area network) by access controller AC1 originally.
Step 3: based on the information that in step 2, obtains, access controller AC1 is by the source address and the destination address of recognition data, being provided with source address is that work station PC1 destination address is that the data of work station STA1 are redirected to access controller server A C Server by the Layer 2 data tunnel DT1 between access controller AC1 and the access controller server A C Server, source address and the destination address of access controller server A CServer by recognition data then, being provided with source address is that work station PC1 destination address is that the data of work station STA1 are redirected to access controller AC2 by the Layer 2 data tunnel DT2 between access controller server A C Server and the access controller AC2; Access controller AC2 is by the source address and the destination address of recognition data simultaneously, being provided with source address is that work station STA1 destination address is that the data of work station PC1 are redirected to access controller server A C Server by the data tunnel DT2 between access controller AC2 and the access controller server A CServer, source address and the destination address of access controller server A C Server by recognition data then, being provided with source address is that work station STA1 destination address is that the data of work station PC1 are redirected to access controller server A C1 by the data tunnel DT1 between access controller server A CServer and the access controller AC1.
Step 4: it is after work station PC1 destination address is the data of work station STA1 that access controller AC2 receives redirected source address, gives work station STA1 with this data forwarding; It is after work station STA1 destination address is the data of work station PC1 that access controller AC1 receives redirected source address, gives work station PC1 with this data forwarding.
Preferably, access controller AC1 and AC2 by it with the concrete steps that the control tunnel of access controller server A C Server obtains the information of work station STA1 are respectively in the step 2: at first, access controller AC2 sets up wireless connections with access controller AC2 to access controller server A C Server notice work station STA1, sends the request of inquiry work station STA1 information simultaneously to access controller server A C Server; After access controller server A C Server receives the notice and request that access controller AC2 sends, then notify access controller AC1 work station STA1 current with access controller AC2 set up wireless connections, respond the request of access controller AC2 simultaneously, and inform that access controller AC2 work station STA1 sets up wireless connections with access controller AC1 before this.Thus, access controller AC1 and AC2 obtain the information of work station STA1 respectively by it with the control tunnel of access controller server A C Server.
Preferably, data source address in the step 3 or destination address can be the medium access control address of work station STA1 and PC1.
The 4th embodiment
In the fourth embodiment of the present invention, based on the unified WLAN (wireless local area network) of setting up in a second embodiment of netted fusion, work station by the redirected forwarding of the Layer 2 data tunnel DT of data message between access controller, reaches the purpose of work station seamless roam in moving process.The following detailed process that fourth embodiment of the invention is described with reference to Fig. 9 and Figure 10.
Step 1: as shown in Figure 9, access controller AC1 and AC2 have successfully set up Layer 2 data tunnel DT; Work station PC1 and access controller are in same double layer network.Work station STA1 with the management of access controller AC1 under wireless access point AP 1 successfully set up Radio Link and be connected, thereby work station STA1 can carry out double layered communication with PC1.
Because work station STA1 is moved, access point AP2 can provide better wireless access service under the management of discovery access controller AC2, work station STA1 and access controller AC2 set up Radio Link, thereby finish the roaming from access point AP1 to access point AP2.
Step 2: because the access controller server is in the unified WLAN (wireless local area network) of same netted fusion, then access controller AC1 and AC2 can obtain the information of work station STA1 by control tunnel to each other, be that access controller AC1 can obtain the current information that inserts by access controller AC2 of work station STA1, access controller AC2 can determine that also work station STA1 inserted this WLAN (wireless local area network) by access controller AC1 originally.
Step 3: based on the information that in step 2, obtains, access controller AC1 can be by recognition data source address and destination address, being provided with source address is that work station PC1 destination address is that the data of work station STA1 are redirected to access controller AC2 by the Layer 2 data tunnel DT between access controller AC1 and the AC2; And access controller AC2 can be by recognition data source address and destination address, being provided with source address is that work station STA1 destination address is that the data of work station PC1 are redirected to access controller AC1 by the data tunnel DT between access controller AC2 and the AC1;
Step 4: access controller AC2 receive by the data tunnel DT between access controller AC1 and the AC2 be redirected send to work station STA1 data from work station PC1 after, give work station STA1 with this data forwarding; Access controller AC1 receive by the data tunnel DT between access controller AC1 and the AC2 be redirected send to work station PC1 data from work station STA1 after, give work station PC1 with this data forwarding.
Preferably, access controller AC1 and AC2 can the control tunnel by to each other obtain the concrete steps of the information of work station STA1 and are in the step 2: at first, the whole access controller broadcast announcement work station STA1s of access controller AC2 in WLAN (wireless local area network) set up wireless connections with access controller AC2, send the request of inquiry work station STA1 information simultaneously to whole access controllers; After access controller AC1 receives the notice and request that access controller AC2 sends, then learn work station STA1 current with access controller AC2 set up wireless connections, respond the request of access controller AC2 simultaneously, and set up wireless connections with access controller AC1 before informing access controller AC2 work station STA1.Thus, access controller AC1 and AC2 obtain the information of work station STA1 by control tunnel to each other.
Preferably, data source address in the step 3 or destination address can be the medium access control address of work station STA1 and PC1.
Claims (19)
- One kind the expansion 802.11 WLAN (wireless local area network) method, this method may further comprise the steps:A., the access controller server is set in WLAN (wireless local area network);B. access controller is to this access controller server registration and carry out authentication, and preserved the log-on message of this access controller by this access controller server;C. set up control tunnel and Layer 2 data tunnel between this access controller and this access controller server, then WLAN (wireless local area network) realizes starlike expansion.
- 2. the method for expansion 802.11 WLAN (wireless local area network) as claimed in claim 1 is characterized in that in the steps A, and this access controller server itself can be access controller.
- 3. the method for expansion 802.11 WLAN (wireless local area network) as claimed in claim 1, it is characterized in that before the step B, this access controller perhaps obtains the information of this access controller server by the information of this access controller server of configuration acquisition by broadcast request.
- 4. the method for expansion 802.11 WLAN (wireless local area network) as claimed in claim 1; it is characterized in that among the step C; after setting up the control tunnel between this access controller and this access controller server, this access controller and this access controller server can be safeguarded the control tunnel by the keep-alive message.
- 5. 802.11 WLAN (wireless local area network) of an expansion, comprise at least two access controllers, it is characterized in that this WLAN (wireless local area network) further comprises an access controller server, wherein between described access controller and this access controller server, establish control tunnel and Layer 2 data tunnel.
- 6. 802.11 WLAN (wireless local area network) of expansion as claimed in claim 5 is characterized in that this access controller server itself can be access controller.
- One kind the expansion 802.11 WLAN (wireless local area network) method, this method may further comprise the steps:A., the access controller server is set in WLAN (wireless local area network);B. access controller is to this access controller server registration and carry out authentication, and preserved the log-on message of this access controller by this access controller server;C. between this access controller and this access controller server, set up the control tunnel;D. this access controller server sends the information of other registered access controllers to this access controller;E. described registered access controller is being set up control tunnel and Layer 2 data tunnel each other, and then WLAN (wireless local area network) realizes netted expansion.
- 8. the method for expansion 802.11 WLAN (wireless local area network) as claimed in claim 7 is characterized in that in the steps A, and this access controller server itself can be access controller.
- 9. the method for expansion 802.11 WLAN (wireless local area network) as claimed in claim 7, it is characterized in that before the step B, this access controller perhaps obtains the information of this access controller server by the information of this access controller server of configuration acquisition by broadcast request.
- 10. the method for expansion 802.11 WLAN (wireless local area network) as claimed in claim 7; it is characterized in that among the step C; after setting up the control tunnel between this access controller and this access controller server, this access controller and this access controller server can be safeguarded the control tunnel by the keep-alive message.
- 11. the method for expansion 802.11 WLAN (wireless local area network) as claimed in claim 8 is characterized in that among the step C, sets up the Layer 2 data tunnel between this access controller and this access controller server.
- 12. the method for expansion 802.11 WLAN (wireless local area network) as claimed in claim 7, it is characterized in that among the step D, this access controller server can initiatively send the information of other access controllers to this access controller, perhaps this access controller also can be dynamically to the information of these other access controllers of access controller server lookup.
- 13. 802.11 WLAN (wireless local area network) of an expansion, comprise at least two access controllers, it is characterized in that this WLAN (wireless local area network) further comprises the access controller server, wherein between described access controller and this access controller server, establish the control tunnel, and between described access controller, establish control tunnel and Layer 2 data tunnel.
- 14. 802.11 WLAN (wireless local area network) of expansion as claimed in claim 13 is characterized in that this access controller server itself can be access controller.
- 15. 802.11 WLAN (wireless local area network) of expansion as claimed in claim 14 is characterized in that establishing the Layer 2 data tunnel between described access controller and this access controller server.
- 16. the method that a data redirection is transmitted is applied to 802.11 WLAN (wireless local area network) of expansion as claimed in claim 5, this method may further comprise the steps:A. work station moves between the access point of former access controller and existing access controller control, sets up wireless link by 802.11 WLAN (wireless local area network) and the new access point that is somebody's turn to do existing access controller control of expansion as claimed in claim 5;B. the former access controller of this work station and existing access controller by and this access controller server between the information of mutual this work station in control tunnel;C. according to the information of data source end and destination, this former access controller and should existing access controller by and this access controller server between the Layer 2 data tunnel each other with message redirecting;D. access controller be forwarded to destination to message with being somebody's turn to do now by this former access controller after being redirected.
- 17. the method that data redirection as claimed in claim 16 is transmitted is characterized in that this former access controller with the concrete steps of being somebody's turn to do mutual this work station information of existing access controller is among the step B:A. now access controller sends the request of the historical information of this work station of inquiry simultaneously to the current information of this this work station of access controller server notification to this access controller server;B. after this access controller server was received the notice and request that this existing access controller sends, this former access controller of current information notice with this work station sent response simultaneously the historical information of this work station is informed this existing access controller.
- 18. the method that a data redirection is transmitted is applied to 802.11 WLAN (wireless local area network) of expansion as claimed in claim 13, this method may further comprise the steps:A. work station moves between the access point of former access controller and existing access controller control, sets up wireless link by 802.11 WLAN (wireless local area network) and the new access point that is somebody's turn to do existing access controller control of expansion as claimed in claim 13;B. the former access controller of this work station and existing access controller pass through the information of mutual this work station in control tunnel each other;C. according to the information of data source end and destination, former access controller and the existing access controller Layer 2 data tunnel by each other is each other with message redirecting;D. access controller be forwarded to destination to message with being somebody's turn to do now by this former access controller after being redirected.
- 19. the method that data redirection as claimed in claim 18 is transmitted is characterized in that this former access controller with the concrete steps of being somebody's turn to do mutual this work station information of existing access controller is among the step B:A. now access controller sends the request of the historical information of this work station of inquiry simultaneously to the work at present information of wireless local area networks broadcast notice work station;B. after this former access controller is received the notice and request that this existing access controller sends, then learn the current information of this work station, send response simultaneously the historical information of this work station is informed this existing access controller.
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