CN105792174A - Wireless local area network roaming method, access point and wireless controller - Google Patents
Wireless local area network roaming method, access point and wireless controller Download PDFInfo
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- CN105792174A CN105792174A CN201410830086.0A CN201410830086A CN105792174A CN 105792174 A CN105792174 A CN 105792174A CN 201410830086 A CN201410830086 A CN 201410830086A CN 105792174 A CN105792174 A CN 105792174A
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Abstract
The embodiment of the invention relates to a wireless local area network roaming method, an access point and a wireless controller. The method comprises the following steps that: when a first terminal roams to a second AP from a first AP, the second AP sends a request message to the wireless controller; the request message includes the MAC address of the first terminal; association with the first terminal is established; the MAC address of the first terminal and the IP address of the first terminal sent by the wireless controller are received; an ARP message or a NDP message is sent to a gateway according to an internet protocol version, which the IP address of the first terminal belongs to; the ARP message or the NDP message includes the IP address of the first terminal and the MAC address of the first terminal; and the second AP receives a first data message sent by the gateway and sends the first data message to the first terminal. Visibly, in the embodiment of the invention, the ARP message or the NDP message is sent to the gateway through the second AP, so that the gateway is prompted to updatea port corresponding to the MAC address of the first terminal to be under a port connected to a new AP; and thus, the normal traffic forwarded from the network side to the new AP after the terminal roams can be ensured.
Description
Technical field
The present invention relates to communication technical field, particularly relate to WLAN loaming method, access point and wireless controller.
Background technology
It is (English: wirelesslocalareanetwork that the terminal such as smart mobile phone and panel computer both provides WLAN, abbreviation: WLAN) function, terminal can pass through WLAN, and (English: accesspoint, abbreviation: AP) association, thus accessing the Internet with access point.Due to the limited coverage area of AP, therefore generally there is multiple AP in a bigger place, to increase WLAN coverage.When a terminal AP from multiple AP is switched to another AP, it is known as WLAN roaming.
When terminal roams into two AP from an AP, the port that on gateway, the End user addresses of storage is corresponding remains as the port of an AP association, still, gateway forwards to roaming front port, is caused flow interrupt from gateway to the network traffics in terminal direction.
Summary of the invention
The embodiment of the present invention provides WLAN loaming method, access point and wireless controller, it is possible to when terminal roams into another AP from an AP, upgrade in time port, it is ensured that normal from network side to the new AP flow forwarded after user's roaming.
First aspect, it is provided that a kind of WLAN loaming method, described method includes:
When first terminal is roamed into two AP by an AP, described 2nd AP sends request message to wireless controller, the medium education that described request message includes described first terminal is (English: mediaaccesscontrol, abbreviation: MAC) address, and set up and the associating of described first terminal；
Described 2nd AP receives the MAC Address of the described first terminal that described wireless controller sends and Internet protocol (English: InternetProtocol, the abbreviation: IP) address of described first terminal；
When the IP address of described first terminal is that internet protocol version 4 is (English: InternetProtocolversion4, abbreviation: IPv4) during address, it is (English: AddressResolutionProtocol that described 2nd AP sends address resolution protocol to gateway, abbreviation: ARP) message, described ARP message includes the IP address of described first terminal and the MAC Address of described first terminal；When the IP address of described first terminal is that internet protocol version 6 is (English: InternetProtocolversion6, abbreviation: IPv6) during address, described 2nd AP sends Neighbor Discovery Protocol (English: NeighborDiscoveryProtocol to gateway, abbreviation: NDP) message, described NDP message includes the IP address of described first terminal and the MAC Address of described first terminal；
Described 2nd AP receives the first data message that described gateway sends；Described 2nd AP sends described first data message to described first terminal.
In conjunction with first aspect, in the first implementation of first aspect, described first data message receives the port of described ARP message or described NDP message from described gateway.
In conjunction with the first implementation of first aspect or first aspect, in the second implementation of first aspect, described method also includes:
Described 2nd AP receives the second data message that described first terminal sends；
Described 2nd AP is by (English: virtuallocalareanetwork for the first VLAN of described 2nd AP ownership, abbreviation: VLAN mark VLAN) is added in described second data message, and sending described second data message to described gateway, the VLAN mark of a described VLAN forwards described second message for indicating described gateway according to described corresponding for a VLAN three layers forwarding interface.
Second aspect, it is provided that a kind of WLAN loaming method, described method includes:
When first terminal is roamed into two AP by an AP, wireless controller receives the described 2nd AP request message sent, and described request message includes the MAC Address of described first terminal；
Described wireless controller obtains the MAC Address of described first terminal and the IP address of described first terminal, and the MAC Address of described first terminal and the IP address of described first terminal are sent to described 2nd AP.
In conjunction with second aspect, in the first implementation of second aspect, described when first terminal is roamed into two AP by an AP, before wireless controller receives the described 2nd AP request message sent, described method also includes:
Wireless controller receives the MAC Address of the AP first terminal sent and the IP address of described first terminal；
It is stored in corresponding with the IP address of described first terminal for the MAC Address of described first terminal in contingency table；
Described wireless controller obtains the MAC Address of described first terminal and the IP address of described first terminal, including:
Described wireless controller inquires about described contingency table, obtains the MAC Address of described first terminal and the IP address of described first terminal from described contingency table.
The third aspect, it is provided that a kind of access point, described access point includes:
Unit is set up in association, for when first terminal is roamed into two AP by an AP, sends request message to wireless controller, and described request message includes the MAC Address of described first terminal, and sets up and the associating of described first terminal；
Receive unit, the IP address of MAC Address with described first terminal for receiving the described first terminal that described wireless controller sends；
Transmitting element, for when the IP address of described first terminal is IPv4 address, sending ARP message to gateway, described ARP message includes the IP address of described first terminal and the MAC Address of described first terminal；When the IP address of described first terminal is IPv6 address, sending NDP message to gateway, described NDP message includes the IP address of described first terminal and the MAC Address of described first terminal；
Described reception unit, is additionally operable to receive the first data message that described gateway sends；Described transmitting element, is additionally operable to send described first data message to described first terminal.
In conjunction with the third aspect, in the first implementation of the third aspect, the first data message that described reception unit receives receives the port of described ARP message or described NDP message from described gateway.
In conjunction with the first implementation of the third aspect or the third aspect, in the second implementation of the third aspect, described reception unit, it is additionally operable to receive the second data message that described first terminal sends；
Described transmitting element, the VLAN mark being additionally operable to the VLAN by described 2nd AP ownership is added in the second data message that described reception unit receives, and sending described second data message to described gateway, the VLAN mark of a described VLAN forwards described second data message for indicating described gateway according to described corresponding for a VLAN three layers forwarding interface.
Fourth aspect, it is provided that a kind of wireless controller, described wireless controller includes:
Receiving unit, for when first terminal is roamed into two AP by an AP, receiving the described 2nd AP request message sent, described request message includes the MAC Address of described first terminal；
Acquiring unit, the request message for receiving according to described reception unit obtains the MAC Address of described first terminal and the IP address of described first terminal；
Transmitting element, the MAC Address of described first terminal and the IP address of described first terminal for being obtained by described acquiring unit are sent to described 2nd AP.
In conjunction with fourth aspect, in the first implementation of fourth aspect, described reception unit, is additionally operable to, before described reception unit receives the described 2nd AP request message sent, receive the MAC Address of the AP first terminal sent and the IP address of described first terminal；
Described wireless controller also includes:
Memory element, the MAC Address of the described first terminal for being received by described reception unit is corresponding with the IP address of described first terminal to be stored in contingency table；
Described acquiring unit, specifically for inquiring about described contingency table, obtains the MAC Address of described first terminal and the IP address of described first terminal from described contingency table.
5th aspect, it is provided that a kind of access point, described access point includes:
Ethernet interface, wireless lan interfaces, processor and memorizer.
Memorizer storage program code.
Processor is used for performing following operation:
When first terminal is roamed into two AP by an AP, sending request message by Ethernet interface to wireless controller, described request message includes the MAC Address of described first terminal；
Foundation associates with described first terminal；
The MAC Address of the described first terminal that described wireless controller sends and the IP address of described first terminal is received by Ethernet interface；
When the IP address of described first terminal is IPv4 address, sending ARP message by Ethernet interface to gateway, described ARP message includes the IP address of described first terminal and the MAC Address of described first terminal；When the IP address of described first terminal is IPv6 address, sending NDP message by Ethernet interface to gateway, described NDP message includes the IP address of described first terminal and the MAC Address of described first terminal；
The first data message that described gateway sends is received by Ethernet interface；
Described first data message is sent to described first terminal by wireless lan interfaces.
In conjunction with the 5th aspect, in the first implementation in the 5th, described first data message receives the port of described ARP message or described NDP message from described gateway.
In conjunction with the first implementation of the 5th aspect or the 5th aspect, in the second implementation in the 5th, processor is additionally operable to perform following operation:
The second data message that described first terminal sends is received by wireless lan interfaces；
The VLAN mark of the oneth VLAN of described 2nd AP ownership is added in described second data message；
Sending the second data message of obtaining of described processor by Ethernet interface to described gateway, the VLAN mark of a described VLAN forwards described second data message for indicating described gateway according to described corresponding for a VLAN three layers forwarding interface.
6th aspect, it is provided that a kind of wireless controller, described wireless controller includes: Ethernet interface, processor and memorizer.
Memorizer storage program code, and the corresponding relation of the IP address of the MAC Address of storage first terminal and described first terminal.
Processor is used for performing following operation:
When first terminal is roamed into two AP by an AP, receiving the described 2nd AP request message sent by Ethernet interface, described request message includes the MAC Address of described first terminal；
The MAC Address of described first terminal and the IP address of described first terminal is obtained according to the request message received；
The MAC Address of described first terminal obtained and the IP address of described first terminal are sent to described 2nd AP by Ethernet interface.
In conjunction with the 6th aspect, in the first implementation in the 6th, processor is additionally operable to perform following operation:
Before receiving the described 2nd AP request message sent, received the MAC Address of the AP first terminal sent and the IP address of described first terminal by Ethernet interface；
It is stored in corresponding with the IP address of described first terminal for the MAC Address of the described first terminal received in contingency table；
Inquire about described contingency table, from described contingency table, obtain the MAC Address of described first terminal and the IP address of described first terminal.
In the embodiment of the present invention, when first terminal is roamed into two AP by an AP, 2nd AP sends request message to wireless controller, request message includes the MAC Address of first terminal, and set up and the associating of first terminal, 2nd AP receives the MAC Address of the first terminal that wireless controller sends and the IP address of first terminal, the internet protocol version belonging to IP address according to first terminal, 2nd AP sends ARP message or NDP message to gateway, described ARP message or NDP message include the IP address of first terminal and the MAC Address of first terminal, 2nd AP receives the first data message that gateway sends, the first data message is sent to first terminal.Therefore, in the embodiment of the present invention, when first terminal is roamed into two AP by an AP, first terminal is replaced to send ARP message or NDP message to gateway by the 2nd AP, thus promoting gateway that physical port corresponding for the MAC Address of first terminal is updated under the physical port of the new AP gateway connected, it is ensured that normal from network side to the new AP flow forwarded after terminal roaming.
Accompanying drawing explanation
The network architecture schematic diagram that the WLAN loaming method that Fig. 1 provides for the embodiment of the present invention is based on；
The WLAN loaming method flow chart that Fig. 2 provides for the embodiment of the present invention；
The WLAN loaming method flow chart that Fig. 3 provides for the embodiment of the present invention；
The WLAN access processing method flow chart that Fig. 4 provides for the embodiment of the present invention；
The WLAN loaming method flow chart that Fig. 5 provides for the embodiment of the present invention；
A kind of access point structures schematic diagram that Fig. 6 provides for the embodiment of the present invention；
A kind of wireless controller structure schematic diagram that Fig. 7 provides for the embodiment of the present invention；
A kind of access point structures schematic diagram that Fig. 8 provides for the embodiment of the present invention；
A kind of wireless controller structure schematic diagram that Fig. 9 provides for the embodiment of the present invention.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is explicitly described.
The network architecture schematic diagram that the WLAN loaming method that Fig. 1 provides for the embodiment of the present invention is based on, wherein, terminal 101 has WLAN function, it is possible to set up association by WLAN and AP；Oneth AP102 and the two AP103 is two different access points.The coverage of the oneth AP102 and the two AP103 can identical, can partly overlap, can also be entirely different.Gateway 104 is the gateway of an AP102, is also the gateway of the 2nd AP103.Gateway 104 is disposed VLAN aggregation (English: VLANAggregation), the port Port1 of the gateway 104 that the oneth AP102 connects belongs to a VLAN (such as VLAN10), the port Port2 of the gateway 104 that the 2nd AP103 connects belongs to another VLAN (such as VLAN20), wherein, it is (English: sub-VLAN) that VLAN10 and VLAN20 is Sub-VLAN, it is (English: super-VLAN) (such as, VLAN100) that the two Sub-VLAN belongs to a Supper VLAN.Wireless controller 105 is used for managing AP.In the embodiment of the present invention, terminal 101 can be switched (English: handoff) to the 2nd AP103 by an AP102, can also being connected to two layers of forwarding unit such as the network switch between AP and gateway, the network switch between these AP and gateways can be referred to as access switch.
Above-mentioned VLAN aggregation, its principle is that one or more sub-VLAN belongs to a super-VLAN, relate to internet protocol version 4 (English: InternetProtocolversion4, abbreviation: the IPv4) concept during distribution of address, describe a kind of mechanism, from identical IPv4 subnet to residing in the base structure of identical physical exchange but being in separating the host addressing of virtual broadcast domain, it is (English: InternetProtocol that common default gateway Internet protocol shared by these main frames, abbreviation: IP) address, thus no longer it is necessary for each VLAN or Metropolitan Area Network (MAN) distributes special IP subnet.The IPv4 address that such mechanism substantially reduces in VLAN and Metropolitan Area Network (MAN) is used to consume.It can also be convenient in the network internal management to IPv4 address.
In common WLAN loaming method, when terminal is roamed into two AP by an AP, it is that gateway media Access Control is (English: mediaaccesscontrol that 2nd AP receives the destination address of terminal transmission, abbreviation: MAC) after the data message of address, need to be added in data message the VLAN mark of the VLAN of an AP ownership by the 2nd AP, correspondingly, access switch between AP and gateway needs to add all of VLAN of whole net, access switch needs study to arrive all MAC Address of whole net, demand cannot be met when access switch mac address table specification is less.In the embodiment of the present invention, owing to gateway 104 deploying VLAN aggregation technology, when terminal roaming, after AP receives the message that destination address is gateway MAC address that terminal sends, the VLAN mark of the VLAN of this AP ownership can be added in messages, thus each access switch need not add all of VLAN of whole net, each access switch only need to learn the MAC Address of the terminal in the VLAN of place and the network equipment, decreases the requirement accessing switch mac address table size.
Normally, under the scene of large user's amount, broadcasting packet is very many, owing to there is no the restriction of VLAN, Web broadcast territory is very big, and a large amount of broadcasting packets are all from air interface (English: airinterface), the i.e. communication interface between AP wireless side and mobile terminal of AP, being transmitted to terminal, forward efficiency is low.In the embodiment of the present invention, each access switch has only to add the VLAN of the AP ownership connected, and without adding all of VLAN, has therefore been effectively isolated broadcast domain by the division of VLAN.
The WLAN loaming method flow chart that Fig. 2 provides for the embodiment of the present invention, the executive agent of the method is AP, and described method includes:
Step 201, when first terminal is roamed into two AP by an AP, described 2nd AP sends request message to wireless controller, and described request message includes the MAC Address of described first terminal, and sets up and the associating of described first terminal.
Wherein, described 2nd AP sets up with before the associating of described first terminal, and described method can also include: described 2nd AP receives the response message of described wireless controller transmission；Described 2nd AP sends association response according to described response message to described first terminal.
In the embodiment of the present invention, wireless controller can manage access terminal, specifically can control terminal at different AP internetwork roamings, when terminal accesses at an AP time, the access rights that wireless controller can have this terminal are sent to an AP, after terminal is roamed into the 2nd AP by an AP, the access rights that wireless controller is also required to that this terminal is had are sent to the 2nd AP.It addition, wireless controller receive the 2nd AP send request message after, it is judged that from the 2nd AP access number of terminals reach the upper limit, it is possible to the 2nd AP respond response message, refusal terminal association request.
Step 202, the 2nd AP receives the MAC Address of the first terminal that described wireless controller sends and the IP address of first terminal.
In the embodiment of the present invention, relevant table in wireless controller, contingency table has the association list item of first terminal, association list item includes the MAC Address of first terminal and the IP address of first terminal.
nullWherein，Wireless controller can before first terminal be associated with the 2nd AP，It is associated with in the process of an AP and sets up association list item for first terminal，Described association list item includes the MAC Address of first terminal and the IP address of first terminal，Specifically can include following processing procedure: first terminal sends the first association request to an AP，Oneth AP sends request message to wireless controller，According to described request message, wireless controller judges that described first terminal is for accessing user first，Association list item is set up for described first terminal，Association list item includes the MAC Address of described first terminal，Wireless controller sends response message to an AP，Oneth AP is associated with described first terminal，Oneth AP sends the first association response to first terminal，First terminal associates response according to described first and is associated with a described AP，Oneth AP obtains the corresponding relation of the MAC Address of first terminal and the IP address of first terminal，Described corresponding relation is sent to wireless controller，The IP address of first terminal is added in described association list item by wireless controller.
In the embodiment of the present invention, oneth AP specifically can pass through DHCP (English: DynamicHostConfigurationProtocol, abbreviation: DHCP) message obtains the corresponding relation of the MAC Address of first terminal and the IP address of first terminal.
It is (English: AddressResolutionProtocol that oneth AP can also pass through address resolution protocol, abbreviation: ARP) message obtains the corresponding relation of the MAC Address of first terminal and the IP address of first terminal, such as, oneth AP monitors the ARP message that first terminal is mutual with gateway, obtains the corresponding relation of the MAC Address of first terminal and the IP address of first terminal from ARP message.
Step 203, when the IP address of first terminal is IPv4 address, the 2nd AP sends ARP message to gateway, and ARP message includes the IP address of first terminal and the MAC Address of first terminal；When the IP address of first terminal is that internet protocol version 6 is (English: InternetProtocolversion6, abbreviation: IPv6) during address, 2nd AP sends Neighbor Discovery Protocol (English: NeighborDiscoveryProtocol to gateway, abbreviation: NDP) message, NDP message includes the IP address of first terminal and the MAC Address of first terminal.
Wherein, above-mentioned ARP message be specifically as follows ARP request (English: ARPrequest) or arp reply (English: ARPreply), ARP request can be that (English: GratuitousARP) or common ARP, this is not specifically limited gratuitous ARP by the embodiment of the present invention.The IP address that sender IP address is described first terminal of described ARP message, the MAC Address that sender's MAC Address is described first terminal of described ARP message.
Reverse address resolution protocol is (English: ReverseAddressResolutionProtocol, abbreviation: RARP) work in the way of contrary with ARP, owing to usual gateway cannot process RARP message, therefore in the embodiment of the present invention, AP sends ARP message to gateway, rather than sends RARP message to gateway.Additionally, gateway is according to the corresponding relation of MAC Address and the physical port of the terminal of storage, by this physical port to terminal forwarding data packets.If being sent RARP message by AP to gateway when terminal roaming, owing to gateway will not update above-mentioned corresponding relation according to RARP message, thus gateway can not change the port of forwarding data packets.
In the embodiment of the present invention, it is (English: NeighborSolicitation that above-mentioned NDP message is specifically as follows neighbor request, abbreviation: NS) or neighbours' bulletin (English: NeighborAdvertisement, abbreviation: NA), the IP address that source IP address is described first terminal in the IP head of described NDP message.It is (English: sourcelink-layeraddress) option, the value of this option is the MAC Address of described first terminal that described NDP message includes source link layer address.
In the embodiment of the present invention, when terminal roams into two AP from an AP, terminal carries out the path of data message transmission and reception and also there occurs change, wherein, the physical port of the gateway that the oneth AP connects is the first port, the physical port of the gateway that the 2nd AP connects is the second port, after terminal roaming, the data message that terminal sends to gateway can be received by the second port of gateway, the data message that gateway sends to terminal also should be sent by the second port of gateway, corresponding relation for the terminal in the mac address table of more new gateway with the physical port of gateway, ARP message can be sent to gateway by the 2nd AP, to realize the corresponding relation of the terminal in the mac address table of more new gateway and the physical port of gateway, that is the renewal of gateway forwards port is realized.Concrete version according to IP agreement, can select in step 203 to send ARP message or NDP message, for instance, when the concrete version of IP agreement is IPv6, described 2nd AP sends ARP message to gateway, but sends NDP message.
Step 204, the 2nd AP receives the first data message that described gateway sends.
Wherein, described first data message receives the port of described ARP message or described NDP message from described gateway, and above-mentioned port is physical port, and the 2nd AP is connected with the port of gateway, and this port belongs to a VLAN.
Step 205, the 2nd AP sends the first data message to described first terminal.
Wherein, the 2nd AP will can first carry out message format conversion process from the first data message having line side to receive, and the first data message is converted to radio frames, then again the first data message is sent to first terminal.
In the embodiment of the present invention, described method can also include: described 2nd AP receives the second data message that described first terminal sends；The VLAN mark of the oneth VLAN of described 2nd AP ownership is added in described second data message by described 2nd AP, and sending described second data message to described gateway, the VLAN mark of a described VLAN forwards described second data message for indicating described gateway according to described corresponding for a VLAN three layers forwarding interface.
Above-mentioned three layers forwarding interface is the logic interfacing of three layers corresponding for super-VLAN.
Wherein, the second data message received from wireless side can first be carried out message format conversion process by the 2nd AP, the second data message is converted to the message format that applicable wired mode sends, then again the second data message is sent to gateway.
From above-mentioned processing procedure, in the embodiment of the present invention, when first terminal is roamed into two AP by an AP, 2nd AP sends request message to wireless controller, request message includes the MAC Address of first terminal, and set up and the associating of first terminal, 2nd AP receives the MAC Address of the first terminal that wireless controller sends and the IP address of first terminal, the internet protocol version belonging to IP address according to first terminal, 2nd AP sends ARP message or NDP message to gateway, described ARP message or NDP message include the IP address of first terminal and the MAC Address of first terminal, 2nd AP receives the first data message that gateway sends, the first data message is sent to first terminal.Therefore, in the embodiment of the present invention, when first terminal is roamed into two AP by an AP, first terminal is replaced to send ARP message or NDP message to gateway by the 2nd AP, thus promoting gateway that physical port corresponding for the MAC Address of first terminal is updated under the physical port of the new AP gateway connected, it is ensured that normal from network side to the new AP flow forwarded after terminal roaming.
Common message this locality forwards and is not added with tunnel encapsulation, all uses identical VLAN before and after terminal switching.After gateway receives message, owing to being all forward according to identical VLAN mark before and after switching, the forwarding port of such gateway has only to data message and can be carried out have updated.And each sub-VLAN under supper-VLAN is not in a subnet, forward port so cannot update according to data message.In the embodiment of the present invention, have employed supper-VLAN technology, it is isolation that user's two layer message under each sub-VLAN forwards, and under different sub-VLAN, user asks ARP message to be also isolation mutually, and thus can not realize user under different Sub-VLAN can not access mutually.If needing to realize realizing exchanging visits between user in different Sub-VLAN, gateway needs to enable ARP proxy function.
The WLAN loaming method flow chart that Fig. 3 provides for the embodiment of the present invention, the executive agent of the method is wireless controller, and described method includes:
Step 301, when first terminal is roamed into two AP by an AP, wireless controller receives the described 2nd AP request message sent, and described request message includes the MAC Address of described first terminal.
Wherein, it is described when first terminal is roamed into two AP by an AP, before wireless controller receives the described 2nd AP request message sent, described method can also include: wireless controller receives the MAC Address of the AP first terminal sent and the IP address of described first terminal；It is stored in corresponding with the IP address of described first terminal for the MAC Address of described first terminal in contingency table.
Step 302, wireless controller obtains the MAC Address of described first terminal and the IP address of described first terminal, and the MAC Address of described first terminal and the IP address of described first terminal are sent to described 2nd AP.
Described wireless controller obtains the MAC Address of described first terminal and the IP address of described first terminal, specifically may include that described wireless controller inquires about described contingency table, from described contingency table, obtain the MAC Address of described first terminal and the IP address of described first terminal.
In the embodiment of the present invention, described method can also include:
Described wireless controller sends response message to described 2nd AP, and described 2nd AP sends association response to described first terminal.
The WLAN access processing method flow chart that Fig. 4 provides for the embodiment of the present invention, the method includes terminal and accesses the process of network first, and described method includes:
Step 401, first terminal sends the first association request to an AP.
Wherein, described first association request can be carried the MAC Address of described first terminal.
Step 402, an AP sends request message to wireless controller, carries the MAC Address of described first terminal in described request message.
Step 403, according to described request message, wireless controller judges that described first terminal is for accessing user first, sets up association list item for described first terminal.
Association list item includes the MAC Address of described first terminal.
Step 404, wireless controller sends response message to an AP.
Step 405, an AP is associated with described first terminal.
Wherein, an AP after an AP the first association request sent, can be associated with described first terminal by first terminal in receiving step 401；Or, in receiving step 404, wireless controller is after the AP response message sent, and is associated with described first terminal.
Step 406, an AP sends the first association response to first terminal.
Oneth AP after an AP the first association request sent, can send the first association response to first terminal by first terminal in receiving step 401；Or, in receiving step 404, wireless controller is after the AP response message sent, and sends the first association response to first terminal.
Step 407, first terminal associates response according to described first and is associated with a described AP.
Step 408, an AP obtains the MAC Address of first terminal and the corresponding relation of IP address, and described corresponding relation is sent to wireless controller.
In the embodiment of the present invention, an AP specifically can pass through dhcp message and obtain the MAC Address of first terminal and the corresponding relation of IP address.
Oneth AP can also pass through ARP message and obtain the MAC Address of first terminal and the corresponding relation of IP address, and such as, an AP monitors the ARP message that first terminal is mutual with gateway, obtains the MAC Address of first terminal and the corresponding relation of IP address from ARP message.
Step 409, the IP address of first terminal is added in described association list item by wireless controller.
Step 410, after first terminal is associated with an AP, sends ARP request to gateway.
Step 411, according to the receiving port of described ARP request, gateway determines that the AP physical port connected is the first port.
Follow-up gateway is sent to an AP by being sent to the message of first terminal by described first port, then is sent to first terminal after message being carried out format conversion processing by an AP.
Step 412, gateway sends arp response according to described ARP request to first terminal.
Arp response includes the MAC Address of described gateway, so that follow-up first terminal is when sending message to network side, is added in described message as target MAC (Media Access Control) address by the MAC Address of described gateway.
The message that destination address is gateway MAC address that first terminal sends is through an AP, by an AP, the VLAN mark of the oneth VLAN of its correspondence is added in described message, described message through gateway, is identified according to the VLAN of a VLAN by gateway and is forwarded by corresponding for a VLAN three layers forwarding interface by described message.
The WLAN loaming method flow chart that Fig. 5 provides for the embodiment of the present invention, the method includes terminal roaming and accesses the process of network, and described method includes:
Step 501, when first terminal roams into two AP, first terminal sends the second association request to the 2nd AP.
Wherein, the second association request is carried the MAC Address of described first terminal.
Step 502, the 2nd AP sends request message to wireless controller, and described request message includes the MAC Address of described first terminal.
Step 503, wireless controller sends response message to the 2nd AP.
Step 504, the 2nd AP is according to described response message relating to described first terminal.
Step 505, the 2nd AP sends the second association response to first terminal.
Step 506, first terminal associates response according to described second and is associated with described 2nd AP.
Step 507, according to described request message, wireless controller judges that described first terminal is for roamer, is sent to the 2nd AP by the IP address of the MAC Address of first terminal Yu first terminal.
Wherein, wireless controller can search the corresponding relation of the MAC Address of first terminal and the IP address of first terminal according to the MAC Address of the first terminal carried in described request message in the contingency table self set up, and the IP address of the MAC Address of first terminal Yu first terminal is sent to the 2nd AP.
In the embodiment of the present invention, step 507 can merge with step 503, by response message, the IP address of the MAC Address of first terminal Yu first terminal is sent to the 2nd AP.
In addition, by an AP, the IP address of the MAC Address of first terminal Yu first terminal can also be sent to the 2nd AP, but the IP address of the MAC Address of first terminal Yu first terminal is preferably sent to the 2nd AP by wireless controller by the embodiment of the present invention, relative to by an AP, the IP address of the MAC Address of first terminal Yu first terminal being sent to the 2nd AP, processing procedure is more simple.
Step 508,2nd AP replaces described first terminal to send ARP request to gateway according to the MAC Address of first terminal with the IP address of first terminal, the IP address that value is described first terminal of sender's IP address field of described ARP request, the MAC Address that value is described first terminal of sender's MAC Address field of described ARP request.
Step 509, according to the receiving port of described ARP request, gateway determines that the 2nd AP physical port connected is the second port.
The data message being sent to first terminal can be sent to the 2nd AP by the second port by follow-up gateway, the 2nd AP be sent to first terminal after data message being carried out format conversion processing.
The data message that destination address is gateway MAC address that first terminal sends is through the 2nd AP, by the 2nd AP, the VLAN mark of the 2nd VLAN of its correspondence is added in described data message, described data message through gateway, is identified according to the VLAN of the 2nd VLAN by gateway and is forwarded by the 2nd corresponding for VLAN three layers forwarding interface by described data message.
In the embodiment of the present invention, gateway is disposed VLAN aggregation technology, such super-VLAN can comprise multiple sub-VLAN that remain different broadcast domain, sub-VLAN no longer takies an independent subnet, in same super-VLAN, no matter which sub-VLAN main frame belongs to, and its IP address is all in the subnet that super-VLAN is corresponding.
Terminal initial accesses at wireless controller, wireless controller can obtain terminal access user information (such as IP address, MAC Address, VLAN etc.), when terminal associates to new AP roam-requests, wireless controller sends the information such as IP address and the MAC Address of terminal by message to new AP, new AP can obtain IP address and the mac address information of roamer, it is achieved roamer is simultaneous user's information when new and old AP switches.
Normally, in terminal roaming moment, on gateway, the MAC Address of the terminal of storage does not update with the corresponding relation of the physical port of gateway, the physical port of the gateway that AP connects before the still corresponding roaming of the MAC Address of terminal, the physical port of the gateway still connected by AP before gateway forwards to roaming to the flow in terminal direction from gateway, but terminal is roamed away, flow can forward and abandon.In the embodiment of the present invention, due to terminal roaming to new AP, when associating with new AP, new AP has obtained the IP address of terminal, mac address information, new AP assembles ARP message or NDP message, ARP message or NDP message is sent by AP proxy terminal to gateway when roaming successfully, after gateway receives ARP message or NDP message, the corresponding relation of the MAC Address of the more new terminal of the receiving port according to ARP message or NDP message and the physical port of gateway, it is ensured that normal from network side to the new AP flow forwarded after terminal roaming.
In the embodiment of the present invention, owing to gateway deploying VLAN aggregation technology, when terminal roaming under different AP, even if VLAN is varied, but belong to same subnet, from terminal to the flow in gateway direction, by new AP, terminal is sent to the data message of gateway and stamps the VLAN mark of new VLAN, then being then forwarded to gateway, gateway is forwarded by identical three layers forwarding interface after receiving data message, and the bidirectional traffics after such terminal roaming forward and can quickly forward in time.
A kind of access point structures schematic diagram that Fig. 6 provides for the embodiment of the present invention, with reference to Fig. 6, described access point includes:
Unit 601 is set up in association, for when first terminal is roamed into two AP by an AP, sends request message to wireless controller, and described request message includes the MAC Address of described first terminal, and sets up and the associating of described first terminal；
Receive unit 602, the IP address of MAC Address with described first terminal for receiving the described first terminal that described wireless controller sends；
Transmitting element 603, for when the IP address of described first terminal is IPv4 address, sending ARP message to gateway, described ARP message includes the IP address of described first terminal and the MAC Address of described first terminal；When the IP address of described first terminal is IPv6 address, sending NDP message to gateway, described NDP message includes the IP address of described first terminal and the MAC Address of described first terminal；
Described reception unit 602, is additionally operable to receive the first data message that described gateway sends；Described transmitting element 603, is additionally operable to send described first data message to described first terminal.
In a kind of specific embodiment of the present invention, the first data message that described reception unit 602 receives receives the port of described ARP message or described NDP message from described gateway.
In the another kind of specific embodiment of the present invention, described reception unit 602, it is additionally operable to receive the second data message that described first terminal sends；
Described transmitting element 603, the VLAN mark being additionally operable to the VLAN by described 2nd AP ownership is added in the second data message that described reception unit 602 receives, and sending described second data message to described gateway, the VLAN mark of a described VLAN forwards described second data message for indicating described gateway according to described corresponding for a VLAN three layers forwarding interface.
In the embodiment of the present invention, when first terminal is roamed into two AP by an AP, set up unit 601 by the association in the 2nd AP and send request message to wireless controller, request message includes the MAC Address of first terminal, and set up and the associating of first terminal, receive unit 602 and receive the MAC Address of the first terminal that wireless controller sends and the IP address of first terminal, the transmitting element 603 internet protocol version belonging to the IP address of first terminal, ARP message or NDP message is sent to gateway, described ARP message or NDP message include the IP address of first terminal and the MAC Address of first terminal, receive unit 602 and receive the first data message that gateway sends, transmitting element 603 sends the first data message to first terminal.Therefore, in the embodiment of the present invention, when first terminal is roamed into two AP by an AP, first terminal is replaced to send ARP message or NDP message to gateway by the transmitting element 603 in the 2nd AP, thus promoting gateway that physical port corresponding for the MAC Address of first terminal is updated under the physical port of the new AP gateway connected, it is ensured that normal from network side to the new AP flow forwarded after terminal roaming.
A kind of wireless controller structure schematic diagram that Fig. 7 provides for the embodiment of the present invention, with reference to Fig. 7, described wireless controller includes:
Receiving unit 701, for when first terminal is roamed into two AP by the first access point AP, receiving the described 2nd AP request message sent, described request message includes the MAC Address of described first terminal；
Acquiring unit 702, the request message for receiving according to described reception unit 701 obtains the MAC Address of described first terminal and the IP address of described first terminal；
Transmitting element 703, the MAC Address of described first terminal and the IP address of described first terminal for being obtained by described acquiring unit 702 are sent to described 2nd AP.
In a kind of specific embodiment of the present invention, described reception unit 701, it is additionally operable to, before described reception unit 701 receives the described 2nd AP request message sent, receive the MAC Address of the AP first terminal sent and the IP address of described first terminal；
Described wireless controller also includes:
Memory element 704, the MAC Address of the described first terminal for being received by described reception unit 701 is corresponding with the IP address of described first terminal to be stored in contingency table；
Described acquiring unit 702, specifically for inquiring about described contingency table, obtains the MAC Address of described first terminal and the IP address of described first terminal from described contingency table.
A kind of access point structures schematic diagram that Fig. 8 provides for the embodiment of the present invention, with reference to Fig. 8, described access point includes: Ethernet interface 801, wireless lan interfaces 802, processor 803 and memorizer 804.
Wireless lan interfaces 802 can include radio circuit 8021 and antenna 8022.
Processor 803 can be central processing unit (English: centralprocessingunit, abbreviation: CPU), or the combination of CPU and hardware chip.Above-mentioned hardware chip can be that special IC is (English: application-specificintegratedcircuit, abbreviation: ASIC), PLD (English: programmablelogicdevice, PLD) or its combination abbreviation:.Above-mentioned PLD can be that CPLD is (English: complexprogrammablelogicdevice, abbreviation: CPLD), field programmable gate array is (English: field-programmablegatearray, abbreviation: FPGA), GAL (English: genericarraylogic, GAL) or its combination in any abbreviation:.
It is (English: volatilememory), for instance random access memory (English: random-accessmemory, abbreviation: RAM) that memorizer 804 can include volatile memory；It is (English: non-volatilememory) that memorizer 804 can also include nonvolatile memory, such as read only memory is (English: read-onlymemory, abbreviation: ROM), flash memory is (English: flashmemory), hard disk is (English: harddiskdrive, abbreviation: HDD) or solid state hard disc (English: solid-statedrive, abbreviation: SSD)；Memorizer 804 can also include the combination of the memorizer of mentioned kind.Memorizer 804 stores program code, and the program code of storage is transferred to processor 803.
Processor 803 is for performing following operation according to program code:
When first terminal is roamed into two AP by an AP, sending request message by Ethernet interface 801 to wireless controller, described request message includes the MAC Address of described first terminal；
Foundation associates with described first terminal；
The MAC Address of the described first terminal that described wireless controller sends and the IP address of described first terminal is received by Ethernet interface 801；
When the IP address of described first terminal is IPv4 address, sending ARP message by Ethernet interface 801 to gateway, described ARP message includes the IP address of described first terminal and the MAC Address of described first terminal；When the IP address of described first terminal is IPv6 address, sending NDP message by Ethernet interface 801 to gateway, described NDP message includes the IP address of described first terminal and the MAC Address of described first terminal；
The first data message that described gateway sends is received by Ethernet interface 801；
Described first data message is sent to described first terminal by wireless lan interfaces 802.
In a kind of specific embodiment of the present invention, described first data message receives the port of described ARP message or described NDP message from described gateway.
In the another kind of specific embodiment of the present invention, processor 803 is additionally operable to perform following operation according to program code:
The second data message that described first terminal sends is received by wireless lan interfaces 802；
The VLAN mark of the oneth VLAN of described 2nd AP ownership is added in described second data message；
Sending the second data message of obtaining of described processor 803 by Ethernet interface 801 to described gateway, the VLAN mark of a described VLAN forwards described second data message for indicating described gateway according to described corresponding for a VLAN three layers forwarding interface.
A kind of wireless controller structure schematic diagram that Fig. 9 provides for the embodiment of the present invention, with reference to Fig. 9, described wireless controller includes: Ethernet interface 901, processor 902 and memorizer 903.
Processor 902 can be CPU, or the combination of CPU and hardware chip.Above-mentioned hardware chip can be ASIC, PLD or its combination.Above-mentioned PLD can be CPLD, FPGA, GAL or its combination in any.
Memorizer 903 can include volatile memory, for instance RAM；Memorizer 804 can also include nonvolatile memory, for instance ROM, flash memory, HDD or SSD；Memorizer 903 can also include the combination of the memorizer of mentioned kind.Memorizer 903 stores program code and the corresponding relation of the IP address of the MAC Address of storage first terminal and described first terminal, and the program code of storage is transferred to processor 902.
Processor 902 is for performing following operation according to program code:
When first terminal is roamed into two AP by an AP, receiving the described 2nd AP request message sent by Ethernet interface 901, described request message includes the MAC Address of described first terminal；
The MAC Address of described first terminal and the IP address of described first terminal is obtained according to the request message received；
The IP address of the MAC Address of the described first terminal obtained and described first terminal is sent to described 2nd AP by Ethernet interface 901.
In a kind of specific embodiment of the present invention, processor 902 is additionally operable to perform following operation according to program code:
Before receiving the described 2nd AP request message sent, received the MAC Address of the AP first terminal sent and the IP address of described first terminal by Ethernet interface 901；
It is stored in corresponding with the IP address of described first terminal for the MAC Address of the described first terminal received in contingency table；
Inquire about described contingency table, from described contingency table, obtain the MAC Address of described first terminal and the IP address of described first terminal.
Professional should further appreciate that, the unit of each example described in conjunction with the embodiments described herein and algorithm steps, can with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate the interchangeability of hardware and software, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel specifically can should be used for using different methods to realize described function to each, but this realization is it is not considered that beyond the scope of this invention.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method can be by program and carrys out instruction processing unit and complete, described program can be stored in computer-readable recording medium, described storage medium is that non-transience is (English: non-transitory) medium, such as random access memory, read only memory, flash memory, hard disk, solid state hard disc, tape is (English: magnetictape), (English: floppydisk), CD is (English: opticaldisc) and combination in any for floppy disk.
The above; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with scope of the claims.
Claims (10)
1. a WLAN loaming method, it is characterised in that described method includes:
When first terminal is roamed into two AP by the first access point AP, described 2nd AP sends request message to wireless controller, and described request message includes the MAC address of described first terminal, and sets up and the associating of described first terminal；
Described 2nd AP receives the MAC Address of the described first terminal that described wireless controller sends and the internet protocol address of described first terminal；
When the IP address of described first terminal is internet protocol version 4IPv4 address, described 2nd AP sends ARP message to gateway, and described ARP message includes the IP address of described first terminal and the MAC Address of described first terminal；When the IP address of described first terminal is internet protocol version 6IPv6 address, described 2nd AP sends Neighbor Discovery Protocol NDP message to gateway, and described NDP message includes the IP address of described first terminal and the MAC Address of described first terminal；
Described 2nd AP receives the first data message that described gateway sends；Described 2nd AP sends described first data message to described first terminal.
2. method according to claim 1, it is characterised in that: described first data message receives the port of described ARP message or described NDP message from described gateway.
3. method according to claim 1 and 2, it is characterised in that described method also includes:
Described 2nd AP receives the second data message that described first terminal sends；
The VLAN mark of the first virtual LAN VLAN of described 2nd AP ownership is added in described second data message by described 2nd AP, and sending described second data message to described gateway, the VLAN mark of a described VLAN forwards described second data message for indicating described gateway according to described corresponding for a VLAN three layers forwarding interface.
4. a WLAN loaming method, it is characterised in that described method includes:
When first terminal is roamed into two AP by the first access point AP, wireless controller receives the described 2nd AP request message sent, and described request message includes the MAC address of described first terminal；
Described wireless controller obtains the MAC Address of described first terminal and the internet protocol address of described first terminal, and the MAC Address of described first terminal and the IP address of described first terminal are sent to described 2nd AP.
5. method according to claim 4, it is characterised in that described when first terminal is roamed into two AP by the first access point AP, before wireless controller receives the described 2nd AP request message sent, described method also includes:
Wireless controller receives the MAC Address of the AP first terminal sent and the IP address of described first terminal；
It is stored in corresponding with the IP address of described first terminal for the MAC Address of described first terminal in contingency table；
Described wireless controller obtains the MAC address of described first terminal and the internet protocol address of described first terminal, including:
Described wireless controller inquires about described contingency table, obtains the MAC address of described first terminal and the internet protocol address of described first terminal from described contingency table.
6. an access point, it is characterised in that described access point includes:
Unit is set up in association, for when first terminal is roamed into two AP by the first access point AP, sends request message to wireless controller, and described request message includes the MAC address of described first terminal, and sets up and the associating of described first terminal；
Receive unit, the internet protocol address of MAC Address with described first terminal for receiving the described first terminal that described wireless controller sends；
Transmitting element, for when the IP address of described first terminal is internet protocol version 4IPv4 address, sending ARP message to gateway, described ARP message includes the IP address of described first terminal and the MAC Address of described first terminal；When the IP address of described first terminal is internet protocol version 6IPv6 address, sending Neighbor Discovery Protocol NDP message to gateway, described NDP message includes the IP address of described first terminal and the MAC Address of described first terminal；
Described reception unit, is additionally operable to receive the first data message that described gateway sends；Described transmitting element, is additionally operable to send described first data message to described first terminal.
7. access point according to claim 6, it is characterised in that: the first data message that described reception unit receives receives the port of described ARP message or described NDP message from described gateway.
8. the access point according to claim 6 or 7, it is characterised in that:
Described reception unit, is additionally operable to receive the second data message that described first terminal sends；
Described transmitting element, the VLAN mark being additionally operable to the first virtual LAN VLAN by described 2nd AP ownership is added in the second data message that described reception unit receives, and sending described second data message to described gateway, the VLAN mark of a described VLAN forwards described second data message for indicating described gateway according to described corresponding for a VLAN three layers forwarding interface.
9. a wireless controller, it is characterised in that described wireless controller includes:
Receiving unit, for when first terminal is roamed into two AP by the first access point AP, receiving the described 2nd AP request message sent, described request message includes the MAC address of described first terminal；
Acquiring unit, the request message for receiving according to described reception unit obtains the MAC Address of described first terminal and the internet protocol address of described first terminal；
Transmitting element, the MAC Address of described first terminal and the IP address of described first terminal for being obtained by described acquiring unit are sent to described 2nd AP.
10. wireless controller according to claim 9, it is characterised in that:
Described reception unit, is additionally operable to, before described reception unit receives the described 2nd AP request message sent, receive the MAC Address of the AP first terminal sent and the IP address of described first terminal；
Described wireless controller also includes:
Memory element, the MAC Address of the described first terminal for being received by described reception unit is corresponding with the IP address of described first terminal to be stored in contingency table；
Described acquiring unit, specifically for inquiring about described contingency table, obtains the MAC address of described first terminal and the internet protocol address of described first terminal from described contingency table.
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