CN1946041A - VLAN polymerizing method, converging exchanger and system based on ARP detector intercept - Google Patents
VLAN polymerizing method, converging exchanger and system based on ARP detector intercept Download PDFInfo
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Abstract
This invention relates to a VLAN aggregation method based on ARP interception, a collection exchange and a system, in which, the method includes: the collection exchange intercepts an ARP request message sent by a source host to a destination host to pick up the ARP list information from the ARP request message and puts it into a local ARP buffer storage list of the collection exchange, utilizing information of the destination host to generate ARP response message to be sent to the source host and corrects the IP message sent to the destination host from the source host and transfers the modified message to the destination host based on the local ARP buffer storage list.
Description
Technical field
The present invention relates to data switching networks, relate in particular to a kind of VLAN aggregation method, convergence switch and system of intercepting based on ARP.
Background technology
Nowadays, characteristic such as in numerous broadband networks establishment schemes, IP network is with its exclusive processing ease, and management is simple, and technology is flexible is shown one's talent in the establishment of metropolitan area network, has accounted for significant proportion.Many areas mainly are to be core switching device with three layers of L3 (layer3) switch, with VLAN is realization means and method, for the user provides the high speed Ethernet Private Line, be used for realizing realizing between high speed Internet access or the intra-company data service and other business of oneself, as video request program and so on.
In the VLAN networking plan, need on convergence switch, enable VLAN and converge, this is because before VLAN aggregation, the VLAN that the user inserts needs to be transparent on the three-tier switch to terminate.When the VLAN number of user's access is more, need on the L3 switch, carry out a large amount of VLAN terminations, each VLAN needs to consume the routing interface resource of a L3 switch, handle for the L3 switch device and caused bigger pressure, the waste that has equally also caused VLAN resource in the aggregation networks with conflict.After enabling VLAN on the convergence switch and converging, the VLAN that the user inserts all can be converged is a up VLAN, effectively reduces VLAN resource consumption in the aggregation networks, same, has also reduced L3 switch VLAN routing interface quantity.
On convergence switch, carry out VLAN aggregation and can adopt following three kinds of known solution: SuperVLAN scheme, PVLAN scheme and QinQ scheme.
1, Super VLAN scheme:
The day for announcing be disclose in November 24, notification number in 2004 Chinese patent application that is CN1177439C a kind of Ethernet insert use in the method for Proxy Address Resolution Protocol.This method is a kind of ARP protocol conversion form, promptly represents destination to send the arp reply message to the source end that sends request by intermediate equipment, realizes the polymerization of VLAN thus.
Super VLAN (also claiming VLAN Aggregation, VLAN aggregation) technology provides a kind of mechanism to make to be in the host assignment that adheres to different VLAN in the same switch separately in identical IPv4 subnet, and uses same default gateway.In a large-scale switching LAN environment, this mechanism has many advantages with respect to traditional IPv4 addressing system.
The major advantage of VLAN aggregation is to save the IP address.Introduce SubVLAN and Super VLAN in switched network environment, they are a kind of more optimal approach that can realize that the IP address is divided.It is divided to same IP subnet with a plurality of different VLAN usually, rather than each VLAN takies a subnet separately, then entire I P subnet is appointed as a VLAN aggregation (Super VLAN), and it comprises all VLAN (Sub VLAN) in the entire I P subnet.
The Sub VLAN that is different in essence still keeps separately independently broadcast domain, and one or more SubVLAN belongs to a Super VLAN, and all uses the interface IP address of Super VLAN to be default gateway ip address.When the main frame among the different Sub VLAN need be communicated by letter each other, need open ARP proxy at Super VLAN.
And for example, open day be the vlan data switching method that discloses a kind of ARP of use message in June 27, the patent No. in 2002 U.S. Patent application that is US2002080800.This method also by using the proxy ARP server, is implemented in the exchanges data between the different VLAN in the same IP subnet, thereby reduces to handle between the VLAN router load of the traffic.
But because the polymerization methods of Super VLAN belongs to the networking model of Layer3, its shortcoming is to enable three layer functions on convergence switch, and is switch configuration IP address, needs the operation Routing Protocol could cooperate ARP proxy to finish function.This mode is built up the operator of a double layer network for hope with aggregation networks, is can not received scheme.
2, PVLAN scheme:
PVLAN is also referred to as user-isolated vlan (isolate-user-vlan) technology.
PVLAN is the technology of two layers of vlan topology of a kind of employing.As shown in Figure 1, Fig. 1 is that PVLAN realizes principle schematic in the prior art.A PVLAN and a plurality of Sub-VLAN (Secondaryvlan) correspondence, PVLAN comprises port and the uplink port that comprises in pairing all Sub-VLAN, like this concerning last layer switch, need only discern down the PVLAN in the layer switch, and needn't be concerned about the Sub-VLAN that comprises among the PVLAN, simplify network configuration, saved the VLAN resource.Simultaneously, the user can adopt PVLAN to realize the isolation of two layer message.
But PVLAN has following restrictive condition: descending physical port can only be under the jurisdiction of a Sub-VLAN group, if certain downlink port need insert a plurality of Sub-VLAN, PVLAN can't support.
Therefore, though PVLAN is a simple VLAN aggregation scheme, when having more than one VLAN to need polymerization on the down going port of convergence switch, PVLAN can't play a role.
3, QinQ scheme
In the broadband metropolitan area network networking, also can use the QinQ technology to realize VLAN planning, finish the function that similar VLAN converges, this characteristic is also referred to as the Stack vlan technology.The essence that QinQ solves the VLAN convergence problem is to insert new VLAN label on convergence switch, original access VLAN has been ensconced the message the inside, the outer layer label that the above switch of convergence-level needs only according to message carries out two layers of forwarding, the vlan information of nonrecognition internal layer.
The shortcoming that solves the VLAN convergence problem with the QinQ technology is: the above IP gateway equipment of convergence-level need terminate to the QinQ message that carries two-layer VLAN label, and industry seldom has the router device of supporting this function at present.Therefore adopting this method to be VLAN converges to upper strata IP gateway equipment and has increased extra burden.
Summary of the invention
In view of above-mentioned defective of the prior art, main purpose of the present invention is to provide a kind of VLAN aggregation scheme of intercepting based on ARP, it can solve the VLAN aggregation problem in the double layer network application, than the Super vlan technology, this scheme need be on convergence switch configuration of IP address, one pure two layers VLAN aggregation scheme is provided; Compare the technology with PVLAN, this scheme can insert the VLAN that a plurality of needs converge on a physical port; Than the QinQ technology, this scheme is the VLAN aggregation of individual layer VLAN mode, does not need the upstream router net that the message that carries two-layer VLAN label is carried out three layers of forwarding.
To achieve these goals, the invention provides a kind of VLAN aggregation method of intercepting based on ARP, it is applicable in the network environment that is made of at least one user side VLAN and network side VLAN, wherein, this method can may further comprise the steps: 1) listen to the ARP request message A that a source host sends to a destination host by a convergence switch; 2) this convergence switch extracts the ARP list item information of this source host from this ARP request message A, and it is joined in the local arp cache table of this convergence switch; 3) this convergence switch uses the information of this destination host to produce arp response message D, and sends it to this source host; And 4) this convergence switch is made amendment to the IP message that this destination host sends to this source host, and amended IP message is forwarded to this destination host based on the local arp cache table that above-mentioned steps obtains.
According to above-mentioned VLAN aggregation method, wherein, this ARP request message A can comprise source MAC, source IP address, VLAN and purpose IP address, wherein the source MAC among this ARP request message A is the MAC Address of this source host, source IP address is the IP address of this source host, VLAN is the VLAN of source host, and this purpose IP address is the IP address of this destination host.
According to above-mentioned VLAN aggregation method, wherein, the list item of this this locality arp cache table can comprise IP address, MAC Address, VLAN and port information.
According to above-mentioned VLAN aggregation method, wherein, the information of this destination host can be the VLAN of this destination host, and this arp response message D comprises source MAC, target MAC (Media Access Control) address and VLAN, wherein the source MAC among this response message D is the bridge MAC Address of this convergence switch this locality, this target MAC (Media Access Control) address is the MAC Address of this source host, and this VLAN is the VLAN of this source host.
According to above-mentioned VLAN aggregation method, wherein, can also comprise the steps: between this step 2 and step 3 that list item when this destination host exists and the VLAN of this source host and this destination host when identical, this convergence switch is not replied, and no longer carries out subsequent step.
According to above-mentioned VLAN aggregation method, wherein, between this step 2 and step 3, can also comprise the steps: to exist, and this source host is when being in different VLAN with this destination host this convergence switch execution in step 3 when the list item of this destination host.
According to above-mentioned VLAN aggregation method, wherein, between this step 2 and step 3, can also comprise the steps: not exist when the list item of this destination host, and when this source host is the user side main frame of arbitrary described user side VLAN, it is ARP request message B that this convergence switch is revised this ARP request message A, then this ARP request message B is mail to this destination host, wherein the source MAC among this ARP request message B is the bridge MAC Address of this convergence switch this locality, and VLAN is the VLAN of this destination host.
According to above-mentioned VLAN aggregation method, wherein, after this ARP request message B mails to this destination host, this convergence switch is waited for the arp response message C of this destination host, and judge whether wait timeout, if overtime then this convergence switch is not replied, and no longer carry out subsequent step; Otherwise this convergence switch is after the arp response message C that receives by this destination host response, ARP list item information with this destination host adds in this this locality arp cache table again, wherein, source MAC among this arp response message C is the MAC Address of this destination host, source IP address is the IP address of this destination host, target MAC (Media Access Control) address is the bridge MAC Address of this convergence switch this locality, and purpose IP address is the IP address of this source host, and VLAN is the VLAN of this destination host; Execution in step 3 then.
According to above-mentioned VLAN aggregation method, wherein, between this step 2 and step 3, can also comprise the steps: not exist, and this source host is a network side main frame of arbitrary described network side VLAN when the list item of this destination host, this convergence switch is not replied, and no longer carries out subsequent step.
According to above-mentioned VLAN aggregation method, wherein, also can comprise step between this step 3 and step 4: this convergence switch selects a network side main frame as the network side given host.
According to above-mentioned VLAN aggregation method, wherein, this step 4 can may further comprise the steps: after 41) convergence switch is received this IP message, judge whether the target MAC (Media Access Control) address of this IP message equals the bridge MAC Address of convergence switch this locality: if the target MAC (Media Access Control) address of this IP message equals this bridge MAC Address, then execution in step 42; If the target MAC (Media Access Control) address of this IP message is not equal to the bridge MAC Address, then this IP message is made discard processing; 42) utilize the purpose IP address search of this IP message should this locality arp cache table, if find the ARP list item of destination host in this this locality arp cache table, then execution in step 44; If do not find the ARP list item of destination host in this this locality arp cache table, then execution in step 43; 43) utilize the IP address of this network side given host to search this this locality arp cache table once more; If find the ARP list item of this network side given host in this this locality arp cache table, then execution in step 44; If do not find the ARP list item of this network side given host, then this IP message is made discard processing; 44) judge whether the VLAN in the corresponding ARP list item that above-mentioned steps finds is identical with the VLAN that this IP message carries:, then this IP message is made discard processing if identical; If different, then execution in step 45; And 45) revise this IP message: the target MAC (Media Access Control) address of this IP message is revised as MAC Address in this corresponding ARP list item, the source MAC MAC1 of this IP message is revised as this bridge MAC Address, VLAN in this IP message is revised as VLAN in this corresponding ARP list item, then amended IP message is transmitted to this destination host or this network side given host from the port of this corresponding ARP list item appointment.
To achieve these goals, the present invention also provides a kind of convergence switch of realizing VLAN aggregation of intercepting based on ARP, it is applicable in the network environment that is made of at least one user side VLAN and network side VLAN, wherein, this convergence switch can comprise: bridge MAC Address memory, and it is used to store a bridge MAC Address; The ARP high-speed cache, it is used to store a local arp cache table; ARP intercepts module, it is connected with this ARP high-speed cache with this bridge MAC Address memory, be used to intercept a source host to the ARP request message that a destination host sends, revise this this locality arp cache table, and use the information of this destination host to send the arp response message to this source host; And ARP forwarding module, it is intercepted module with ARP and is connected with described bridge MAC Address memory, ARP high-speed cache, be used for intercepting the local arp cache table that module is revised based on this ARP, this source host is made amendment to the IP message that this destination host sends, and amended IP message is transmitted to this destination host.
According to above-mentioned convergence switch, wherein, this ARP intercepts module can also comprise a modifier, is used for revising the bridge MAC Address of the source MAC of this ARP request message for this convergence switch, and revises the VLAN of the VLAN of this source host in this ARP request message for this destination host.
According to above-mentioned convergence switch, wherein, this ARP intercepts module can also comprise a judgment means, is used for judging whether this this locality arp cache table exists the ARP list item of this destination host, and judges whether this source host and this destination host are in same VLAN.
According to above-mentioned convergence switch, wherein, this ARP intercepts module can also comprise a responding device, is used to replace this destination host that the ARP request that this source host sends is responded, and revises the bridge MAC Address of the source MAC of this ARP request message for this convergence switch.
According to above-mentioned convergence switch, wherein, this ARP forwarding module can or can be an asic chip by FPGA programming realization.
To achieve these goals, the present invention provides a kind of again and intercepts the collecting system of realizing VLAN aggregation based on ARP, and wherein, this VLAN aggregation system can comprise: aforesaid convergence switch; At least one user side VLAN; And network side VLAN.
VLAN aggregation scheme of the present invention has following effect:
1) problem of VLAN aggregation under two layers of networking application conditions of solution, at some network environment, when using in the aggregation networks such as metropolitan area operator, the benefit of saving VLAN, saving the IP address for operator brings;
2) when saving VLAN, user's MAC Address quantity also to be restrained, the above equipment of convergence-level does not need to learn a large amount of MAC Address;
3) compare and technology such as three layers of traditional route, Super VLAN, technical scheme of the present invention is two layers a network environment technical scheme, the equipment of realizing VLAN aggregation does not need to enable any three layers networking technology, such as disposing Layer 3 router interface, configuration of IP address, enabling three layers of technology such as Routing Protocol.Therefore, technical scheme of the present invention can be brought the network that a networking is simple, operational administrative is more prone to the user, has reduced the complexity of network manager, reduces using of user and ties up cost;
4) compare the simple VLAN aggregation technology with PVLAN etc., technical scheme of the present invention has overcome an access interface can only a restriction that inserts VLAN, and stronger versatility is arranged;
5) compare VLAN aggregation technology with QinQ, this technology is replaced VLAN, do not need the terminate message of two-layer VLAN label of the above three-layer network tube apparatus of convergence-level, so versatility is stronger.
Description of drawings
Fig. 1 is that isolate-user-vlan realizes principle schematic in the prior art.
Fig. 2 is the schematic diagram of VLAN aggregation of the present invention.
Fig. 3 is the schematic diagram that ARP of the present invention intercepts processing procedure.
Fig. 4 is the ARP processing of request flow chart that convergence switch LSW of the present invention sends the user side main frame.
Fig. 5 is the schematic diagram that another ARP of the present invention intercepts processing procedure.
The ARP processing of request flow chart that Fig. 6 convergence switch LSW of the present invention sends the network side main frame.
Fig. 7 is the process chart that ARP of the present invention transmits processing procedure.
Fig. 8 is the hardware configuration schematic diagram that the present invention converges exchange.
Embodiment
As shown in Figure 2, by the VLAN aggregation that the ARP of convergence switch of the present invention intercepts processing and two layers of networking of ARP forwarding processing realization, will illustrate respectively that below ARP of the present invention intercepts processing and ARP forwarding processing.
ARP intercepts to handle and relates generally to ARP and intercept the arp cache table in module, the ARP high-speed cache, the bridge MAC Address in the bridge MAC Address memory, and wherein ARP intercepts module, ARP high-speed cache and bridge MAC Address memory and all is arranged in the convergence switch.
ARP intercepts module and is used to scout and catches the ARP request that neighbouring device sends, and the arp cache list item of neighbouring device is stored in the ARP high-speed cache; MAC Address and VLAN in the ARP message of the neighbouring device that captures are made amendment, soon the source MAC of the neighbouring device in the ARP message of neighbouring device replaces with the bridge MAC Address of convergence switch itself, and the VLAN of the neighbouring device in the message is modified as the VLAN of the equipment of being requested, and then amended ARP message is mail to the equipment of being requested.
The arp cache table is the part of hardware table item, need leave in the local high-speed RAM storage medium, can guarantee that like this ARP processing module reads and writes the ARP list item at a high speed.ARP intercepts module after listening to the ARP list item of the network equipment, information is write in the arp cache table of hardware, so that the ARP forwarding module that convergence switch comprises (hereinafter will describe in detail) can obtain the ARP list item, makes things convenient for the hardware forwarding decision.
The bridge MAC Address of convergence switch is the MAC Address that switch device is distributed when dispatching from the factory, and at the device power-on initial phase, CPU writes the specific region of hardware with the bridge MAC Address, so that ARP intercepts module and the ARP forwarding module can obtain.The bridge MAC Address generally leaves in the erasable low speed storage medium of FLASH, the EEPROM etc. of veneer.
Followingly illustrate that with reference to Fig. 3 to Fig. 6 ARP of the present invention intercepts the detailed process of processing.
Before execution ARP intercepted processing, Layer 2 switch was classified to VLAN earlier, and VLAN is divided into user side VLAN (for example main frame 1, main frame 2, main frame 4 etc.) and network side VLAN (for example main frame 3).User side VLAN is meant and is positioned at the VLAN that inserts side, need carry out aggregation processing with technical scheme of the present invention.VLAN after network side VLAN is meant user side VLAN converged.All user side VLAN become same network side VLAN after up direction is by polymerization.After intercepting resume module, become corresponding user side VLAN from the descending network side VLAN of network side by ARP of the present invention.The corresponding a plurality of user side VLAN of network side VLAN.
It is example that the present invention carries out the process that ARP communicates by letter with user side main frame 1 and network side main frame 3, illustrates that the ARP of convergence switch LSW intercepts the handling process that module is carried out VLAN aggregation.VLAN aggregation of the present invention is handled in two kinds of situation: to the ARP processing of request of user side main frame transmission and the ARP processing of request that the network side main frame is sent.
At first the ARP processing of request that convergence switch LSW of the present invention sends the user side main frame is described in conjunction with Fig. 3 and Fig. 4.The detailed step of this processing is as follows:
1) user side main frame 1 sends ARP request message A to destination host, in this ARP request message A, source MAC is the MAC Address (MAC1) of main frame 1, source IP address is the IP address (IP1.1.1.1) of main frame 1, VLAN is the VLAN (VLAN1) of main frame 1, and purpose IP address is the IP address of destination host;
2) convergence switch LSW intercepts and receives after the ARP request message A of user side main frame 1, from this ARP request message A, extract the information of main frame 1, and with its adding or be updated in the arp cache table of convergence switch (comprising information such as MAC1, IP1.1.1.1, VLAN1, port);
3) judge the list item that whether has destination host in the arp cache table of convergence switch LSW, if the list item of destination host exists and user side main frame 1 is identical with the VLAN of destination host, that is to say, destination host (being main frame 4) is the user side main frame under the same VLAN with main frame 1, and then convergence switch is not replied; If the list item of destination host exists and main frame 1 is in different VLAN with destination host (being main frame 3), then execution in step 7; If the list item of destination host (being main frame 3) does not exist, then execution in step 4;
4) convergence switch LSW is revised as ARP request message B with ARP request message A, wherein, source MAC among this ARP request message B is the bridge MAC Address MAC LSW of the local appointment of convergence switch, and VLAN is the VLAN100 of main frame 3, then amended ARP request message B is mail to main frame 3;
5) convergence switch LSW waits for the arp response message C of main frame 3 responses, and judges whether wait timeout, if overtime then convergence switch is not replied; Otherwise execution in step 6;
6) after convergence switch LSW receives the arp response message C of main frame 3 response, the information of main frame 3 added in the local arp cache table (comprise IP1.1.1.100, MAC3, VLAN100, information such as port); And
7) convergence switch LSW produces arp response message D: in this arp response message D, source MAC is the bridge MAC Address MAC LSW of convergence switch this locality, source IP address is the IP address (IP1.1.1.100) of main frame 3, target MAC (Media Access Control) address is the MAC Address (MAC1) of main frame 1, purpose IP address is the IP address (IP1.1.1.1) of main frame 1, and VLAN is the VLAN (VLAN1) of main frame 1; Then arp response message D is sent to user side main frame 1.
In above-mentioned steps 4) and step 5) between, after main frame 3 is received ARP request message B, produce arp response message C, in this arp response message C, source IP address is the IP address (IP1.1.1.100) of main frame 3, and source MAC is the MAC3 of main frame 3, and target MAC (Media Access Control) address is MACLSW, purpose IP address is the IP address (IP1.1.1.1) of main frame 1, and VLAN is VLAN100.
By above-mentioned 7 steps, finish the processing of listen for user side main frame.It is identical that user side main frame 2 and network side main frame 3 carry out process and said process that ARP intercepts, do not repeat them here.
Learnt after the ARP information of neighbouring device, the ARP of convergence switch LSW table thes contents are as follows:
Host1:IP1.1.1.1, VLAN1, MAC1, port information;
Host2:IP1.1.1.2, VLAN2, MAC2, port information;
Host3:IP1.1.1.100, VLAN100, MAC3, port information.
The ARP list item of main frame 1 is as follows:
Host3:IP1.1.1.100, VLAN1, MAC LSW, port information.
The ARP list item of main frame 2 is as follows:
Host3:IP1.1.1.100, VLAN2, MAC LSW, port information.
The ARP list item of main frame 3 is as follows:
Host1:IP1.1.1.1, VLAN100, MAC LSW, port information;
Host2:IP1.1.1.2, VLAN100, MAC LSW, port information.
Below in conjunction with Fig. 5 and Fig. 6 the ARP processing of request that convergence switch LSW of the present invention sends the network side main frame is described.The detailed step of this processing is as follows:
1) network side main frame 3 sends ARP request message A ' to destination host, in ARP message A ', source MAC is the MAC Address (MAC3) of main frame 3, source IP address is the IP address (IP1.1.1.100) of main frame 3, VLAN is the VLAN (VLAN100) of main frame 3, and purpose IP address is the IP address of destination host;
2) after convergence switch LSW receives the ARP request message A ' that main frame 3 sends, from this ARP request message A ', extract the information of main frame 3, and with its adding or be updated in the local arp cache table and (comprise information such as MAC3, IP1.1.1.100, VLAN100, port);
3) judge the list item that whether has destination host in the local arp cache table, if the list item existence of destination host and destination host are identical with the VLAN of main frame 3, perhaps the list item of destination host does not exist, and then convergence switch is not replied; If the list item of destination host (being main frame 1) exists and main frame 1 is in different VLAN with main frame 3, then execution in step 4);
4) convergence switch LSW generates arp response message D ': the source MAC of this response message D ' is the bridge MAC Address MAC LSW of convergence switch this locality; With the target MAC (Media Access Control) address of MAC3 as arp response message D '; At last amended arp response message D ' is mail to main frame 3.
By above-mentioned 4 steps, finish the processing of intercepting the network side main frame.
Intercept the VLAN aggregation that processing realizes by the above-mentioned ARP of the present invention and compared with prior art have following characteristics:
1) convergence switch equipment of the present invention according to the ARP message that main process equipment sends, is initiatively learnt the ARP information of main frame on every side, and is recorded in the arp cache table in the process of intercepting the ARP message;
2) the present invention is in order to solve the problem of VLAN aggregation, and VLAN is divided for two types: a kind of is user side VLAN, and a kind of is network side VLAN; And the ARP request message of process user side VLAN is different with the ARP request message of handling network side VLAN;
3) the ARP request that does not need host device requests on every side to be resolved this machine MAC Address is handled it, and does not need configuration of IP address because ARP intercepts module, does not have the situation of resolving local ip address;
4) main process equipment need not be learnt the ARP list item of switch device on every side;
5) information such as the MAC Address in the original ARP message of modification main process equipment, VLAN are cheated main process equipment on every side on the basis of catching, and guarantee that the MAC Address in the main process equipment ARP list item is consistent with switch device bridge MAC Address;
6) after listening to the ARP request message of main frame, be to need to continue the ARP request message that relay process is received under the empty situation at destination host ARP list item, the assurance destination host can be received this message, and response is made in the ARP request of source host.
Illustrate that below with reference to Fig. 7 ARP of the present invention transmits the detailed process of handling.
ARP transmits to handle and relates generally to ARP forwarding module, CPU, bridge MAC Address and arp cache table.The ARP forwarding module is intercepted the above-mentioned arp cache table that module generates based on ARP of the present invention, and the IP message is transmitted.This ARP forwarding module can be realized by the FPGA programming, also can be asic chip.
Before the work of ARP forwarding module, select a network side main frame as the network side given host from network equipment, this network side given host is exactly the function of serving as default gateway.When the ARP forwarding module can not find out the relevant ARP list item of purpose IP in local arp cache table when, can search local arp cache table once more with the IP address of this network side given host.
ARP forwarding module of the present invention transmits that to be sent to the process of IP message of destination host from user side main frame 1 as follows:
1) main frame 1 sends an IP message to destination host, comprises purpose IP, source IP (IP1.1.1.1), target MAC (Media Access Control) address, source MAC (MAC1) and VLAN (VLAN1) in this message;
2) after convergence switch LSW receives this IP message, judge whether the target MAC (Media Access Control) address of this IP message equals this machine bridge MAC Address MAC LSW of convergence switch: if the target MAC (Media Access Control) address of this IP message equals this machine bridge MAC Address MAC LSW, then execution in step 3; If the target MAC (Media Access Control) address of this IP message is not equal to this machine bridge MAC Address MAC LSW, then the IP message is made discard processing;
3) the ARP forwarding module utilizes the local arp cache table of purpose IP address search of this IP message, if find (being main frame 3) ARP list item of destination host in this this locality arp cache table, then execution in step 5; If do not find the ARP list item of destination host in this this locality arp cache table, then execution in step 4;
4) utilize the IP address of network side given host to search local arp cache table once more; If find the ARP list item of network side given host in this this locality arp cache table, then execution in step 5; If do not find the ARP list item of network side given host, then message made discard processing;
5) judge whether the VLAN in the corresponding ARP list item that above-mentioned steps finds is identical with the VLAN that the IP message carries:, then message is made discard processing if identical; If different, then execution in step 6;
6) revise this IP message, the target MAC (Media Access Control) address of this IP message is revised as MAC Address in the corresponding ARP list item, it is the MAC Address of destination host 3 or network side given host, the source MAC MAC1 of this IP message is revised as this machine bridge MAC Address MAC LSW, VLAN in the IP message is revised as VLAN in the corresponding ARP list item, then amended IP message is transmitted to destination host 3 or network side given host from the port of ARP list item appointment.
From the above, to equal local bridge MAC Address be to trigger the ARP forwarding module to carry out the trigger condition that message is transmitted to the target MAC (Media Access Control) address that carries of IP message.
ARP forwarding module of the present invention transmits that to be sent to the process and the said process of IP message of user side main frame 1 from network side main frame 3 similar, does not repeat them here.
Compared with prior art, ARP forwarding module of the present invention has following characteristics: ARP forwarding module of the present invention only needs to carry out the message forwarding by intercepting the arp cache table that obtains.And existing IP message repeating process generally depends on two tables, one is the main frame routing table of accurately mating, one is the network segment routing table of long coupling, and the main frame routing table generally has the table that the ARP module generates, and network segment routing table is by transmitting that Routing Protocol or static routing configuration obtain.Therefore, the efficient of ARP forwarding module forwarding IP message of the present invention is higher.
Illustrate that below in conjunction with Fig. 8 the present invention converges the hardware configuration schematic diagram of exchange.
The invention provides a kind of convergence switch of realizing VLAN aggregation of intercepting based on ARP, it is applicable in the network environment that is made of at least one user side VLAN and network side VLAN, wherein, this convergence switch can comprise: bridge MAC Address memory, and it is used to store a bridge MAC Address; The ARP high-speed cache, it is used to store a local arp cache table; ARP intercepts module, it is connected with this ARP high-speed cache with this bridge MAC Address memory, be used to intercept a source host to the ARP request message that a destination host sends, revise this this locality arp cache table, and use the information of this destination host to send the arp response message to this source host; And ARP forwarding module, it is intercepted module with ARP and is connected with described bridge MAC Address memory, ARP high-speed cache, be used for intercepting the local arp cache table that module is revised based on this ARP, this source host is made amendment to the IP message that this destination host sends, and amended IP message is transmitted to this destination host.The list item of described local arp cache table comprises IP address, MAC Address, VLAN and port information.
In addition, ARP of the present invention intercepts module also can comprise a modifier, be used for revising the bridge MAC Address of the source MAC of this ARP request message, and revise the VLAN of the VLAN of this source host in this ARP request message for this destination host for this convergence switch; One judgment means is used for judging whether this this locality arp cache table exists the ARP list item of this destination host, and judges whether this source host and this destination host are in same VLAN; And a responding device, be used to replace this destination host that the ARP request that this source host sends is responded, and revise the bridge MAC Address of the source MAC of this ARP request message for this convergence switch.
ARP forwarding module of the present invention can be realized by the FPGA programming, perhaps can be asic chip.
The present invention also provides a kind of and intercepts the collecting system of realizing VLAN aggregation based on ARP, and wherein, this VLAN aggregation system comprises: aforesaid convergence switch; At least one user side VLAN; And network side VLAN.
According to as can be known above-mentioned, VLAN aggregation scheme of the present invention has following effect:
1) problem of VLAN aggregation under two layers of networking application conditions of solution, at some network environment, when using in the aggregation networks such as metropolitan area operator, the benefit of saving VLAN, saving the IP address for operator brings;
2) when saving VLAN, user's MAC Address quantity also to be restrained, the above equipment of convergence-level does not need to learn a large amount of MAC Address;
3) than technology such as three layers of traditional route, Super VLAN, technical scheme of the present invention is two layers a network environment technical scheme, the equipment of realizing VLAN aggregation does not need to enable any three layers networking technology, such as disposing Layer 3 router interface, configuration of IP address, enabling three layers of technology such as Routing Protocol.Therefore, technical scheme of the present invention can be brought the network that a networking is simple, operational administrative is more prone to the user, has reduced the complexity of network manager, reduces using of user and ties up cost;
4) than simple VLAN aggregation technology such as PVLAN, technical scheme of the present invention has overcome an access interface can only a restriction that inserts VLAN, and stronger versatility is arranged;
5) than the VLAN aggregation technology of QinQ, this technology is replaced VLAN, do not need the terminate message of two-layer VLAN label of the above three-layer network tube apparatus of convergence-level, so versatility is stronger.
The above is one of preferred embodiment of the present invention, is not in order to limiting practical range of the present invention, and any those of ordinary skill in the art changes and modifies according to the equalization that the present invention did in the field of the invention, all should belong to covering scope of the present invention.
Claims (14)
1, a kind of VLAN aggregation method of intercepting based on ARP, it is applicable in the network environment that is made of at least one user side VLAN and network side VLAN, it is characterized in that this method may further comprise the steps:
1) listen to the ARP request message A that a source host sends to a destination host by a convergence switch:
2) this convergence switch extracts the ARP list item information of this source host from this ARP request message A, and with its adding or be updated in the local arp cache table of this convergence switch;
3) this convergence switch uses the information of this destination host to produce arp response message D, and sends it to this source host; And
4) this convergence switch is made amendment to the IP message that this destination host sends to this source host, and amended IP message is forwarded to this destination host based on the local arp cache table that above-mentioned steps obtains.
2, VLAN aggregation method according to claim 1 is characterized in that,
The information of this destination host is the VLAN of this destination host, and this arp response message D comprises source MAC, target MAC (Media Access Control) address and VLAN, wherein the source MAC among this response message D is the bridge MAC Address of this convergence switch this locality, this target MAC (Media Access Control) address is the MAC Address of this source host, and this VLAN is the VLAN of this source host.
3, VLAN aggregation method according to claim 1 is characterized in that,
Between this step 2 and step 3, also comprise the steps:
When the list item of this destination host exists and the VLAN of this source host and this destination host when identical, this convergence switch is not replied, and no longer carries out subsequent step.
4, VLAN aggregation method according to claim 1 is characterized in that,
Between this step 2 and step 3, also comprise the steps:
When the list item of this destination host exists, and this source host is when being in different VLAN with this destination host, this convergence switch execution in step 3.
5, VLAN aggregation method according to claim 1 is characterized in that,
Between this step 2 and step 3, also comprise the steps:
When the list item of this destination host does not exist, and when this source host is the user side main frame of arbitrary described user side VLAN, it is ARP request message B that this convergence switch is revised this ARP request message A, then this ARP request message B is mail to this destination host, wherein the source MAC among this ARP request message B is the bridge MAC Address of this convergence switch this locality, and purpose VLAN is the VLAN of this destination host.
6, VLAN aggregation method according to claim 5, it is characterized in that, after this ARP request message B mails to this destination host, this convergence switch is waited for the arp response message C of this destination host, and judge whether wait timeout, if overtime then this convergence switch is not replied, and no longer carries out subsequent step; Otherwise this convergence switch is after the arp response message C that receives by this destination host response, ARP list item information with this destination host adds in this this locality arp cache table again, wherein, source MAC among this arp response message C is the MAC Address of this destination host, source IP address is the IP address of this destination host, target MAC (Media Access Control) address is the bridge MAC Address of this convergence switch this locality, and purpose IP address is the IP address of this source host, and VLAN is the VLAN of this destination host; Execution in step 3 then.
7, VLAN aggregation method according to claim 1 is characterized in that,
Between this step 2 and step 3, also comprise the steps:
When the list item of this destination host does not exist, and this source host is a network side main frame of arbitrary described network side VLAN, and this convergence switch is not replied, and no longer carries out subsequent step.
8, VLAN aggregation method according to claim 1 is characterized in that, also comprises step between this step 3 and step 4: this convergence switch selects a network side main frame as the network side given host.
9, VLAN aggregation method according to claim 8 is characterized in that this step 4 may further comprise the steps:
41) after convergence switch was received this IP message, judge whether the target MAC (Media Access Control) address of this IP message equals the bridge MAC Address of convergence switch this locality: if the target MAC (Media Access Control) address of this IP message equals this bridge MAC Address, then execution in step 42; If the target MAC (Media Access Control) address of this IP message is not equal to the bridge MAC Address, then this IP message is made discard processing;
42) utilize the purpose IP address search of this IP message should this locality arp cache table, if find the ARP list item of destination host in this this locality arp cache table, then execution in step 44; If do not find the ARP list item of destination host in this this locality arp cache table, then execution in step 43;
43) utilize the IP address of this network side given host to search this this locality arp cache table once more; If find the ARP list item of this network side given host in this this locality arp cache table, then execution in step 44; If do not find the ARP list item of this network side given host, then this IP message is made discard processing;
44) judge whether the VLAN in the corresponding ARP list item that above-mentioned steps finds is identical with the VLAN that this IP message carries:, then this IP message is made discard processing if identical; If different, then execution in step 45; And
45) revise this IP message: the target MAC (Media Access Control) address of this IP message is revised as MAC Address in this corresponding ARP list item, the source MAC MAC 1 of this IP message is revised as this bridge MAC Address, VLAN in this IP message is revised as VLAN in this corresponding ARP list item, then amended IP message is transmitted to this destination host or this network side given host from the port of this corresponding ARP list item appointment.
10, a kind ofly intercept the convergence switch of realizing VLAN aggregation based on ARP, it is applicable in the network environment that is made of at least one user side VLAN and network side VLAN, it is characterized in that this convergence switch comprises:
Bridge MAC Address memory, it is used to store a bridge MAC Address;
The ARP high-speed cache, it is used to store a local arp cache table;
ARP intercepts module, it is connected with this ARP high-speed cache with this bridge MAC Address memory, be used to intercept a source host to the ARP request message that a destination host sends, revise this this locality arp cache table, and use the information of this destination host to send the arp response message to this source host; And
The ARP forwarding module, it is intercepted module with ARP and is connected with described bridge MAC Address memory, ARP high-speed cache, be used for intercepting the local arp cache table that module is revised based on this ARP, this source host is made amendment to the IP message that this destination host sends, and amended IP message is transmitted to this destination host.
11, convergence switch according to claim 10 is characterized in that,
This ARP intercepts module and also comprises a modifier, is used for revising the bridge MAC Address of the source MAC of this ARP request message for this convergence switch, and revises the VLAN of the VLAN of this source host in this ARP request message for this destination host.
12, convergence switch according to claim 10 is characterized in that,
This ARP intercepts module and also comprises a judgment means, is used for judging whether this this locality arp cache table exists the ARP list item of this destination host, and judges whether this source host and this destination host are in same VLAN.
13, convergence switch according to claim 10 is characterized in that,
This ARP intercepts module and also comprises a responding device, is used to replace this destination host that the ARP request that this source host sends is responded, and revises the bridge MAC Address of the source MAC of this ARP request message for this convergence switch.
14, a kind of collecting system of intercepting the realization VLAN aggregation based on ARP is characterized in that this VLAN aggregation system comprises:
As each described convergence switch among the claim 10-13;
At least one user side VLAN; And
A network side VLAN.
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