CN1561045A - Method for implementing transparent bridging of radio local network bridging - Google Patents
Method for implementing transparent bridging of radio local network bridging Download PDFInfo
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- CN1561045A CN1561045A CNA2004100065746A CN200410006574A CN1561045A CN 1561045 A CN1561045 A CN 1561045A CN A2004100065746 A CNA2004100065746 A CN A2004100065746A CN 200410006574 A CN200410006574 A CN 200410006574A CN 1561045 A CN1561045 A CN 1561045A
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Abstract
This invention discloses a method for realizing WLAN mail bridge transparent connection including a process flow of center and remote acc mail bridge to data frame, if the frame has labels of remote acc mail bridge, the central mail bridge recovers its source MAC address and length and if the target port is monadic data frame, it should be replaced by MAC address and labeled while other data frames are forwarded directly by the transparent mail bridge, after data frames received, the target MAC address and length are recovered for those having labels of the central acc mail bridge, and those sent to the port should be replaced by source MAC address and labeled to be forwarded by the transparent bridge.
Description
Technical field
The present invention relates to a kind of communication means of WLAN (wireless local area network), when relating in particular to a kind of IEEE 802.11 wireless local area network buildings, utilize the center to insert the implementation method that bridge and long-range access bridge transparent bridging carry out wireless telecommunications.
Background technology
Along with popularizing that WLAN (wireless local area network) is used, in some difficult areas of setting up network by cable, the transparent bridging by radio local network net bridge has solved the unvanquishable difficult problem of traditional cable network, and this application more and more is subjected to users' welcome.So-called transparent bridging is meant the content that does not change receiving data frames, transmits rule according to Frame, and Frame is sent to the destination pellucidly.
When actual networking, the center is laid a center and is inserted bridge (AB-Center) usually, and the center is inserted bridge and also be can be used as WAP (wireless access point) (AP), inserts a plurality of wireless terminals (STA).Lay a plurality of long-range access bridges (AB-Client) in the border district, each long-range access bridge is equivalent to STA, inserts bridge through the wireless association center that is linked into, and this bridge networking model is also referred to as basis (Infrastructure) architecture mode.Insert the wireless transparent bridges forward of bridge through long-range access bridge and center, insert between the cable network user that bridge links to each other with long-range access bridge or center and and be linked into can mutual communication between the wireless terminal of center access bridge.
The WLAN (wireless local area network) center of realizing with IEEE 802.11 MAC firmware design is inserted in bridge and the long-range access bridge product at present, the multicast or the broadcast data frame that come auto correlation wireless terminal or long-range access bridge that the IEEE 802.11 MAC firmwares of bridge can direct repeating system receive from wireless medium inserted at the center, and target MAC (Media Access Control) address be monocular (Unicast) Frame of related wireless terminal to destination device, but the Frame of other types then can not adopt the mode of this direct repeating system to realize.
For example, the source MAC that long-range access bridge inserts all types Frame of bridge transmission to the center must be the wireless MAC address of long-range access bridge, and long-range access bridge could insert bridge through the wireless medium center that send to Frame; The bridge of center access simultaneously must be long-range access bridge self radio MAC Address to the target MAC (Media Access Control) address of the monocular Frame that long-range access bridge sends, and long-range access bridge could receive the Frame that inserts bridge from the center.Therefore, must do conversion to the source MAC or the target MAC (Media Access Control) address of Frame, and the MAC Address that the recipient must the restore data frame be converted after conversion, long-range access bridge and center are inserted between the user of bridge, and (needed to insert bridge) proper communication between the user of long-range access bridge through the center.And just can't realize with the method for MAC firmware relaying.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of implementation method of radio local network net bridge transparent bridging, can realize between the long-range access bridge subscriber, and the proper communication between long-range access bridge and the center access bridge subscriber.
In order to solve the problems of the technologies described above, the invention provides the implementation method that the bridge transparent bridging is inserted at a kind of WLAN (wireless local area network) center, and a kind of implementation method of long-range access bridge transparent bridging of mutual correspondence.
Wherein, the implementation method of center access bridge transparent bridging may further comprise the steps:
(a) receive Frame;
(b) judge whether described Frame has long-range access bridge mark, if, the source MAC of Frame reverted to the source MAC of initial data frame and revert to the length of initial data frame, carry out next step, otherwise directly carry out next step;
(c) type of the described Frame of judgement, if the monocular Frame is carried out next step, if multicast or broadcast data frame, execution in step (f);
(d) determine the destination interface of described Frame, and judge its type, if long-range access bridge is carried out next step, otherwise execution in step (f);
(e) preserving its target MAC (Media Access Control) address on the described Frame and doing center access bridge mark, then its target MAC (Media Access Control) address is replaced to the MAC Address of the long-range access bridge that will mail to, and increase the length of described Frame;
(f) press transparent bridging and transmit rule, described Frame is forwarded to destination interface.
Said method also can have following characteristics: in described step (b) before, judge the media of described Frame earlier, if from wireless medium, and execution in step (b), if from wired media, execution in step (c).
Said method also can have following characteristics: described center is inserted and is created wireless terminal tabulation, the tabulation of long-range access bridge and mac address table on the bridge, earlier described mac address table is bound and learnt to source MAC and its receiving port of described Frame before in described step (c), in described step (d), for the monocular Frame, determine the destination interface that this Frame should mail to according to its target MAC (Media Access Control) address from described mac address table, if do not find, be destination interface just with the every other port except the reception sources port.
Said method also can have following characteristics: described step (d) earlier judges whether the source MAC of described Frame and target MAC (Media Access Control) address are positioned at same port before, if, finish after filtering out this Frame, otherwise execution in step (d).
Said method also can have following characteristics: described center access bridge mark is data 32 bit checks and the acquisition by calculated data frame fixed position and length.
Accordingly, the implementation method of the long-range access bridge of the present invention transparent bridging may further comprise the steps:
(a) receive Frame;
(b) check described Frame, insert the bridge mark, carry out next step if having the center, otherwise, execution in step (d);
(c) target MAC (Media Access Control) address of described Frame is reverted to the target MAC (Media Access Control) address of initial data frame and revert to the length of initial data frame;
(d) determine the destination interface of described Frame,, carry out next step if mail to radio port, if mail to cable port, execution in step (f);
(e) preserving its source MAC on the described Frame and doing long-range access bridge mark,, and increasing the length of described Frame then with the MAC Address of the long-range access bridge of its source MAC alternative costs;
(f) press transparent bridging and transmit rule, Frame is forwarded to destination interface.
Said method also can have following characteristics: in described step (b), if not having the center, described Frame do not insert bridge, carry out following steps earlier: judge whether described Frame has long-range access bridge mark, if, the source MAC of described Frame reverted to the source MAC of initial data frame and revert to the length of initial data frame, execution in step (d) again, otherwise, direct execution in step (d).
Said method also can have following characteristics: in described step (b) before, judge the media of described Frame earlier, if from wireless medium, and execution in step (b), if from wired media, execution in step (d).
Said method also can have following characteristics: create mac address table on the described long-range access bridge, earlier described mac address table is bound and learnt to source MAC and its receiving port of described Frame before in described step (d), in described step (d), for the monocular Frame, determine the destination interface that this Frame should mail to according to its target MAC (Media Access Control) address from described mac address table, if do not find, be destination interface just with the every other port except the reception sources port.
Said method also can have following characteristics: described step (d) before, the type of elder generation's judgment data frame, if multicast or broadcast data frame, execution in step (d) is if the monocular Frame continues to judge whether its source MAC is positioned at identical port with target MAC (Media Access Control) address, if it is identical, finish after filtering out this Frame, if difference, execution in step (d) again.
Said method also can have following characteristics: described long-range access bridge mark is data 32 bit checks and the acquisition by calculated data frame fixed position and length.
As from the foregoing, the inventive method is in the radio local network net bridge product of realizing with basis (Infrastructure) architecture mode design, insert bridge to the source MAC of forwarding Frame and the conversion or the recovery of target MAC (Media Access Control) address by long-range access bridge and center, and the transparent bridging that inserts bridge through long-range access bridge or center is transmitted, realized between the long-range access bridge subscriber, and long-range access bridge inserts the purpose that can intercom mutually between the bridge subscriber with the center, and can further realize the communication between the user under all situations, obtained the effect of Frame active repeating, it is more extensive to make networking use, and has improved the flexibility of networking.
Description of drawings
Fig. 1 is the schematic diagram that bridge and the networking of long-range access bridge are inserted in embodiment of the invention WLAN (wireless local area network) center;
Fig. 2 is that the flow chart that bridge is handled the data frame is inserted at embodiment of the invention WLAN (wireless local area network) center;
Fig. 3 is the flow chart that the long-range access bridge of embodiment of the invention WLAN (wireless local area network) is handled the data frame.
Embodiment
Networking with Fig. 1 is an example, and bridge AB-Center is inserted at wireless terminal STA and long-range access bridge AB-Client1, AB-Client2 access center, and terminal PC1, PC2 and PC3 are connected respectively to AB-Center, AB-Client1 and AB-Client2.This is the example of a simplification, and AB-Client1, AB-Client2 can be connected a plurality of wire users separately with AB-Center in the practical application, and AB-Center also can insert more wireless terminal and long-range access bridge.
The implementation method of radio local network net bridge transparent bridging of the present invention comprises the implementation method of center access bridge transparent bridging and the implementation method that respective remote inserts the bridge transparent bridging.
The center is inserted needs to create wireless terminal tabulation, the tabulation of long-range access bridge and mac address table on the bridge AB-Center, the wireless terminal STA that inserts is added the wireless terminal tabulation, to insert long-range access bridge AB-Client1,2 and be mapped as the virtual radio port, joining long-range access bridge tabulation binds with this long-range access bridge simultaneously, the source MAC that receives Frame is learnt mac address table, and set up the binding relationship of MAC Address and corresponding port.
As shown in Figure 2, after receiving Frame, the handling process that the transparent bridging of bridge is inserted at the center may further comprise the steps:
Step 100 receives the Frame from wireless medium or wired media (being compartment system);
Step 110, whether the reception media of judgment data frame is wireless medium, if carry out next step, otherwise be from wired media, execution in step 140;
Step 120 checks whether Frame has long-range access bridge mark, if then Frame is carried out next step from long-range access bridge, otherwise from wireless terminal, execution in step 140;
Step 130 reverts to the source MAC of the initial data frame that is kept at the Frame afterbody with the source MAC of Frame, and reverts to the length of initial data frame;
Step 140 with source MAC (then being the address after recovering as changing) and its receiving port (being the reception sources port that Frame enters bridge) binding of Frame, is learnt mac address table;
Whether step 150, judgment data frame multicast or broadcast data frame, if, execution in step 220; Otherwise be the monocular Frame, carry out next step;
Step 160, whether the source MAC of judgment data frame and target MAC (Media Access Control) address are positioned at same port, if, execution in step 230, otherwise carry out next step;
Step 170 is searched the destination interface that Frame should mail to according to the target MAC (Media Access Control) address of Frame at mac address table, does not just find and sends (promptly taking the inundation send mode) to the every other port except the reception sources port;
Step 180, the destination interface type of judgment data frame, if long-range access bridge is carried out next step, if wireless terminal, execution in step 200, if cable port, execution in step 210;
Step 190, the target MAC (Media Access Control) address and the center access bridge mark of Frame are kept at the Frame afterbody, then its target MAC (Media Access Control) address is replaced to the MAC Address of corresponding long-range access bridge, and Frame length is increased MAC Address length and center access bridge mark lengths;
Step 200 is pressed transparent bridging and is transmitted rule, and Frame is forwarded to wireless medium, finishes;
Step 210 is pressed transparent bridging and is transmitted rule, and Frame is forwarded to wired media, finishes;
Step 220 is pressed transparent bridging and is transmitted rule, directly Frame is forwarded to the target media, finishes;
Step 230 filters out this monocular Frame, finishes.
According to above flow process, networking in conjunction with Fig. 1, when center access bridge AB-Center receives the Frame of wireless terminal STA or compartment system user PC1, directly submitting transparent bridging transmits, and when receiving the Frame that PC2, PC3 send by long-range access bridge AB-Client1,2, then need to recover the source MAC and the length of initial data frame.And when transmitting, target MAC (Media Access Control) address is the monocular Frame of long-range access bridge subscriber PC2, PC3, need will send again after the long-range access bridge of being converted to of target MAC (Media Access Control) address AB-Client1,2 the MAC Address, and target MAC (Media Access Control) address is the Frame of wireless terminal STA or center access bridge compartment system user PC1, when perhaps mailing to the broadcasting of PC2, PC3 and multicast packet frame, can directly adopt transparent bridging technology to transmit.
For the bridge product that the MAC firmware is arranged, the multicast or the broadcast data frame that insert bridge through the center that send between STA, PC2, the PC3, and PC2, PC3 insert the monocular Frame that bridge sends to STA through the center, also can be inserted the IEEE 802.11 MAC firmware direct repeating systems of bridge by the center.
Long-range access bridge AB-Client1,2 needs to create mac address table.The source MAC that receives Frame is learnt mac address table, and set up the binding relationship of MAC Address and corresponding port.
As shown in Figure 3, after receiving Frame, the handling process of the transparent bridging of long-range access bridge may further comprise the steps:
Step 300 receives the Frame from wireless medium or compartment system;
Step 310, whether the reception media of judgment data frame is wireless medium, if carry out next step, otherwise be from wired media, execution in step 350;
Step 320, the mark of inspection Frame if having long-range access bridge mark, is carried out next step, inserts the bridge mark if having the center, and execution in step 340 is not if having above-mentioned mark, execution in step 350;
Step 330 reverts to the source MAC of initial data frame with the source MAC of Frame and reverts to the length of initial data frame, execution in step 350;
Step 340 reverts to the target MAC (Media Access Control) address of initial data frame with the target MAC (Media Access Control) address of Frame and reverts to the length of initial data frame;
Step 350 with source MAC (then being the address after recovering as changing) and its receiving port binding of Frame, is learnt mac address table;
Step 360 judges whether the monocular Frame, if, carry out next step, otherwise execution in step 390;
Step 370 judges whether the source MAC of monocular Frame is positioned at identical port with target MAC (Media Access Control) address, if, execution in step 430, otherwise carry out next step;
Step 380 is searched the destination interface that Frame should mail to according to the target MAC (Media Access Control) address of monocular Frame at mac address table, does not just find to send to the every other port except the reception sources port;
Whether step 390, the destination interface of judgment data frame radio port, if, carry out next step, otherwise execution in step 420;
Step 400, the source MAC and the long-range access bridge mark of Frame are kept at the Frame afterbody, then its source MAC is replaced to the MAC Address of local long-range access bridge, and Frame length is increased MAC Address length and long-range access bridge mark lengths;
Step 410 is pressed transparent bridging and is transmitted rule, and Frame is forwarded to wireless medium, finishes;
Step 420 is pressed transparent bridging and is transmitted rule, and Frame is forwarded to wired media, finishes;
Step 430 filters out this monocular Frame, finishes.
According to above flow process, in conjunction with the networking of Fig. 1, PC2, all carries out the replacement of source MAC and does long-range access bridge mark when wireless medium sends all types Frame to PC1, PC3, STA by long-range access bridge AB-Client1.Long-range access bridge AB-Client1 receives the Frame that has long-range access bridge mark, be dealt into multicast or the broadcast data frame of PC2 as the PC3 that inserts MAC firmware direct repeating system on the bridge by the center, need the source MAC and the initial data frame length of restore data frame, be transmitted to user PC2 again.Long-range access bridge AB-Client1 receives and has the Frame that the bridge mark is inserted at the center, and the monocular Frame as STA, PC1 or PC3 are dealt into PC2 needs the target MAC (Media Access Control) address of restore data frame and the length of initial data frame.For the Frame that does not have above-mentioned two kinds of marks that receives from wireless medium, the Frame that reaches from compartment system then needn't carry out the recovery operation of address.
The transparent bridging method of long-range access bridge of present embodiment and center access bridge is combined, the monocular Frame that mails to PC3 with PC2 is an example, can carry out the replacement of source MAC and do long-range access bridge mark at long-range access bridge AB-Client1, bridge AB-Center is inserted at the center can recover its source MAC when receiving, when transparent bridging is transmitted, then carry out the target MAC (Media Access Control) address center of replacing and do and insert the bridge mark, and on long-range access bridge AB-Client2, recover its destination address again, thereby realized the proper communication between PC2 and the PC3, simultaneously concerning recipient user, the content of Frame does not change, and has realized transparent bridging.
And for example, PC1 mails to the monocular Frame of PC2, on center access bridge AB-Center, can carry out the replacement of target MAC (Media Access Control) address and do center access bridge mark, and after being forwarded to long-range access bridge AB-Client1 by transparent bridging, recover the target MAC (Media Access Control) address of its initial data frame again, thereby realized proper communication and transparent bridging between PC1 and the PC2.
Other between STA and PC1, PC2, PC3, can realize proper communication and transparent bridging according to flow process of the present invention, just gives unnecessary details no longer one by one at this.
The bridge mark is inserted at long-range access bridge in the above-mentioned flow process and center can be by data 32 bit checks and the acquisition of calculated data frame fixed position and length.For example 32 bit checks of this 12 byte of calculated data frame target MAC (Media Access Control) address and source MAC and, long-range access bridge mark is got high 16, the center is inserted the bridge mark and is got low 16.
In sum, implementation method by radio local network net bridge transparent bridging of the present invention, insert bridge to the source MAC of transmission Frame and the conversion or the recovery of target MAC (Media Access Control) address by long-range access bridge and center, and the transparent bridging that inserts bridge through long-range access bridge or center is transmitted, realized between the long-range access bridge subscriber, and long-range access bridge inserts the purpose that can intercom mutually between the bridge subscriber with the center.In fact, the method of embodiment has solved and has included the MAC firmware in the problem of communicating by letter between the user under all situations that the interior bridge product that designs realization in the architecture mode exists, and obtained the effect of Frame active repeating, it is more extensive to make networking use, and has improved the flexibility of networking.
It should be noted that the inventive method is not limited to the management method to MAC Address among the embodiment.
Claims (11)
1, a kind of implementation method of WLAN (wireless local area network) center access bridge transparent bridging may further comprise the steps:
(a) receive Frame;
(b) judge whether described Frame has long-range access bridge mark, if, the source MAC of Frame reverted to the source MAC of initial data frame and revert to the length of initial data frame, carry out next step, otherwise directly carry out next step;
(c) type of the described Frame of judgement, if the monocular Frame is carried out next step, if multicast or broadcast data frame, execution in step (f);
(d) determine the destination interface of described Frame, and judge its type, if long-range access bridge is carried out next step, otherwise execution in step (f);
(e) preserving its target MAC (Media Access Control) address on the described Frame and doing center access bridge mark, then its target MAC (Media Access Control) address is replaced to the MAC Address of the long-range access bridge that will mail to, and increase the length of described Frame;
(f) press transparent bridging and transmit rule, described Frame is forwarded to destination interface.
2, the implementation method of bridge transparent bridging is inserted at center as claimed in claim 1, it is characterized in that, in described step (b) before, judge the media of described Frame earlier, if from wireless medium, execution in step (b), if from wired media, execution in step (c).
3, the implementation method of bridge transparent bridging is inserted at center as claimed in claim 1, it is characterized in that, described center is inserted and is created the wireless terminal tabulation on the bridge, long-range access bridge tabulation and mac address table, earlier described mac address table is bound and learnt to source MAC and its receiving port of described Frame before in described step (c), in described step (d), for the monocular Frame, determine the destination interface that this Frame should mail to according to its target MAC (Media Access Control) address from described mac address table, if do not find, be destination interface just with the every other port except the reception sources port.
4, the implementation method of bridge transparent bridging is inserted at center as claimed in claim 1, it is characterized in that, described step (d) before, earlier judge whether the source MAC of described Frame and target MAC (Media Access Control) address are positioned at same port, if, finish after filtering out this Frame, otherwise execution in step (d).
5, the implementation method of bridge transparent bridging is inserted at center as claimed in claim 1, it is characterized in that, described center access bridge mark is data 32 bit checks and the acquisition by calculated data frame fixed position and length.
6, the implementation method of the long-range access bridge of a kind of WLAN (wireless local area network) transparent bridging may further comprise the steps:
(a) receive Frame;
(b) check described Frame, insert the bridge mark, carry out next step if having the center, otherwise, execution in step (d);
(c) target MAC (Media Access Control) address of described Frame is reverted to the target MAC (Media Access Control) address of initial data frame and revert to the length of initial data frame;
(d) determine the destination interface of described Frame,, carry out next step if mail to radio port, if mail to cable port, execution in step (f);
(e) preserving its source MAC on the described Frame and doing long-range access bridge mark,, and increasing the length of described Frame then with the MAC Address of the long-range access bridge of its source MAC alternative costs;
(f) press transparent bridging and transmit rule, Frame is forwarded to destination interface.
7, the implementation method of long-range access bridge transparent bridging as claimed in claim 6 is characterized in that, in described step (b), does not insert bridge if described Frame does not have the center, carries out following steps earlier:
Judge whether described Frame has long-range access bridge mark, if the source MAC of described Frame is reverted to the source MAC of initial data frame, and revert to the length of initial data frame, execution in step (d) again, otherwise, direct execution in step (d).
8, as the implementation method of claim 6 or 7 described long-range access bridge transparent bridgings, it is characterized in that, before in described step (b), judge the media of described Frame earlier, if from wireless medium, execution in step (b), if from wired media, execution in step (d).
9, as the implementation method of claim 6 or 7 described long-range access bridge transparent bridgings, it is characterized in that, create mac address table on the described long-range access bridge, earlier described mac address table is bound and learnt to source MAC and its receiving port of described Frame before in described step (d), in described step (d), for the monocular Frame, determine the destination interface that this Frame should mail to according to its target MAC (Media Access Control) address from described mac address table, if do not find, be destination interface just with the every other port except the reception sources port.
10, as the implementation method of claim 6 or 7 described long-range access bridge transparent bridgings, it is characterized in that, described step (d) before, the type of elder generation's judgment data frame is if the monocular Frame judges whether its source MAC is positioned at identical port with target MAC (Media Access Control) address again, if it is identical, finish after filtering out this Frame, if difference, execution in step (d) again.
As the implementation method of claim 6 or 7 described long-range access bridge transparent bridgings, it is characterized in that 11, described long-range access bridge mark is data 32 bit checks and the acquisition by calculated data frame fixed position and length.
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| WO2007054025A1 (en) * | 2005-11-11 | 2007-05-18 | Huawei Technologies Co., Ltd. | A data processing method in a bridged network, a network bridge and a bridged network |
| CN100362792C (en) * | 2005-08-16 | 2008-01-16 | 浙江中控技术有限公司 | Intelligent gate bridge and its method for realizing network isolation control ' |
| CN100426770C (en) * | 2005-05-08 | 2008-10-15 | 中兴通讯股份有限公司 | Radio local network net bridge, bridging system and its realizing method |
| CN101123570B (en) * | 2006-08-09 | 2011-05-18 | 华为技术有限公司 | Data forward method and system between multiple operator Ethernet |
| CN102355660A (en) * | 2011-10-12 | 2012-02-15 | 杭州华三通信技术有限公司 | Uplink wireless access method and wireless access network bridge device |
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| CN100426770C (en) * | 2005-05-08 | 2008-10-15 | 中兴通讯股份有限公司 | Radio local network net bridge, bridging system and its realizing method |
| CN100362792C (en) * | 2005-08-16 | 2008-01-16 | 浙江中控技术有限公司 | Intelligent gate bridge and its method for realizing network isolation control ' |
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| CN102355660A (en) * | 2011-10-12 | 2012-02-15 | 杭州华三通信技术有限公司 | Uplink wireless access method and wireless access network bridge device |
| CN102355660B (en) * | 2011-10-12 | 2014-03-19 | 杭州华三通信技术有限公司 | Uplink wireless access method and wireless access network bridge device |
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| CN103685027B (en) * | 2012-09-07 | 2017-08-25 | 深圳市腾讯计算机***有限公司 | Forward the method and interchanger of ethernet frame |
| CN103685588A (en) * | 2012-09-10 | 2014-03-26 | 中兴通讯股份有限公司 | Bridge packet forwarding method and device for wireless network equipment in client mode |
| WO2014036890A1 (en) * | 2012-09-10 | 2014-03-13 | 中兴通讯股份有限公司 | Method and device for network bridge of wireless network device forwarding package in client mode |
| CN103731350A (en) * | 2013-12-06 | 2014-04-16 | 南京智达康无线通信科技股份有限公司 | Data forwarding method based on wireless terminal access device |
| CN110417659A (en) * | 2018-04-26 | 2019-11-05 | 贵州濎通芯物联技术有限公司 | Transparent bridging method applied to mesh network |
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