CN103477594B - Communication system, router, switch hub and communication means - Google Patents

Abstract

Each switch hub can be made to carry out forwarding control corresponding to the priority of the data communication performed by each communication terminal while alleviating the fussy degree setting operation.From the router that the network including multiple switch hub is connected with other networks, the communication terminal comprised in the network being had under its command, the control frame of the priority of the data communication that multicast transmission is carried out for inquiring each communication terminal.And, to receive the response frame being written with the priority data representing this priority as opportunity, this router is made to perform following process, that is, each switch hub on the communication path till the transmission source communication terminal of this frame sends for carrying out, in the way of corresponding to the priority shown in this priority data, the instruction that frame forwarding controls.On the other hand, each switch hub is made to perform following process, i.e. switch frame forwards the mode controlled according to the instruction come from router transmission.

Description

Communication system, router, switch hub and communication means

Technical field

The present invention relates to a kind of via LAN(Local Area Network) etc. the various data communication that carry out of communication network Two priority classes.

Background technology

In recent years, generally in enterprise etc., it is built with following enterprise internal information system, i.e. lay in each sites such as branch companies LAN(is hereinafter, referred to as LAN in site), by LAN in these sites by IP(Internet such as routers and the Internet Protocol) net connects.In above-mentioned site, LAN is multiple switch hub cascade arrangements to be constituted, each user's (example mostly Such as, the practitioner of enterprise) communication terminal that uses is connected with some in these switch hubs.Here, so-called road Referred to by device, according to OSI(Open System Interconnection) communication of the 3rd layer (Internet) in reference model Agreement, carry out packet (transmission/recruiting unit of the data in the 3rd layer) forwards the relay controlled.Hand over it addition, so-called The formula hub of changing refers to, according to the communication protocol of the 2nd layer (data link layer) in OSI Reference Model, carries out frame (in the 2nd layer The transmission/recruiting unit of data) forward the relay controlled, also referred to as L2 switch.

Generally, in enterprise's internal information system, perform according to VoIP(Voice Over Internet Protocol) enter Transmission/the reception of the voice data of row or according to HTTP(Hyper Text Transport Protocol) etc. the text that carries out Various types of data communication such as the transmission/reception of data.Such as there is following situation, i.e. carry out between site is long-range In meeting, carry out the transmission/reception of voice data according to VoIP, carry out text data when reading or the write of enterprise's bulletin board Transmission/reception.As it has been described above, in the case of various types of data communication can simultaneously and in parallel be carried out, it is necessary to pin All kinds predetermined priority to data communication, so that the high data communication of priority is not led to by the data that priority is low The obstruction of letter.Such as the priority of the data communication carried out according to VoIP be set to than the data communication carried out according to HTTP is excellent First level is high, so that the former is not counteracted by the latter.If the former receives the obstruction of the latter, the then representative in teleconference Each convention goer speech sound can reproduction etc. by spells, meeting is counteracted.

As all kinds predetermined priority for data communication, so that the high data communication of priority is by preferential One example of the technology that the low data communication of level hinders and enumerated QoS(Quality of Service).So-called QoS is Refer to, when the forwarding that each switch hub carries out frame controls, preferentially carry out the number high with priority compared with other frame Forwarding according to the frame that communication is correlated with.In the case of enterprise as above internal information system, the running management of LAN in each site Personnel must LAN is comprised in for this site each switch hub, grasped and be directly connected to or (that is, warp indirectly By other switch hub) connect have the communication terminal carrying out what type of data communication after, according to these data lead to Believe that the relation between priority suitably carries out this loaded down with trivial details operation of setting of QoS.Therefore, it is proposed to it is various for subtracting The technology of gently relevant to the setting of QoS fussy degree, has enumerated the skill disclosed in patent documentation 1 as a wherein example Art.In technology disclosed in patent documentation 1, the MAC(Media of the communication terminal of audio data transmitting/reception will be carried out Access Control) address with the frame carrying out being included this voice data forward the setting of QoS when controlling in Hold and be associated and be stored in advance in each switch hub.Further, so that the mac address table of this device to store this MAC ground Location is opportunity, makes each switch hub perform to use the process of above-mentioned setting for the COM1 corresponding with this MAC Address.

Patent documentation 1: Japanese Unexamined Patent Publication 2005-184192 publication

Summary of the invention

According to technology disclosed in patent documentation 1, from without grasping the communication terminal carrying out voice data communication in advance with each From the point of view of this point of the annexation of switch hub, it is possible to alleviate the homework burden of running management personnel.But, at patent documentation In technology disclosed in 1, the whole switch hub comprised for LAN, it is necessary to first carry out in advance and lead to carrying out voice data The MAC Address of communication terminal of letter is associated with the setting content of QoS and stores this operation, can not reduce operating fully The homework burden of management personnel.

The present invention is exactly to propose in view of the foregoing, its object is to provide a kind of can alleviating to set the numerous of operation Trivial degree, and make each switch hub carry out corresponding to the priority of the data communication performed by each communication terminal forwarding control The technology of system.

For solving above-mentioned problem, a mode of the present invention provides a kind of communication system, in this communication system, as logical T unit comprises: router, and it is for being connected the network having under its command with other networks；One or more switch hubs, its bag It is contained in the network that described router has under its command；And one or more communication terminals, its respectively with one or more switch types described Some of hub connects, and this communication system is characterised by, described router has: multicast unit, it is in claim frame As forwarding source identifier to give the mailing address of described router, and this claim frame is carried out multicast biography to described network Sending, wherein, this claim frame is used for, and asks to send this communication terminal of expression to one or more communication terminals described respectively and is carried out The priority data of priority of data communication and represent and carried out, to this communication terminal, communicator adjacent that frame forwards Facility information, asks to send the neighbouring device information of this switch hub respectively to one or more switch hubs described； And priority level initializing control unit, it receives at least 1 communication terminal from one or more communication terminals described in order to logical Know the described priority of this communication terminal and neighbouring device information and the priority notification frame of loopback and from described 1 or many At least 1 switch hub in individual switch hub returns to notify the neighbouring device information of this switch hub The neighbouring device notification frame sent, determines from described router to the communication of described at least 1 communication terminal for each communication terminal Switch hub on path, the switch hub transmission on each communication path is positioned at the end of this communication path The priority data of communication terminal and the information of this communication path of expression, send corresponding to the priority shown in this priority data And carry out the instruction forwarding control of the frame sending along this communication path/receiving, described at least 1 switch hub has: Neighbouring device table, the adjacent of communicator that its storage expression has carried out frame forwarding to described at least 1 switch hub sets Standby information；Frame forwards control unit, and it gives in the frame that described at least 1 switch hub receives has forwarding source to identify In the case of symbol, after this forwarding source identifier is write to described neighbouring device table as neighbouring device information, by this turn The identifier that rises be rewritten as described in the mailing address of at least 1 switch hub and carry out turning corresponding to the transmission target of this frame Send out and control；Neighbouring device notification unit, it is in the case of the frame received is described claim frame, generates and is written with in described phase The neighbouring device notification frame of the neighbouring device information of storage in adjacent equipment list, by the communication of described at least 1 switch hub Address gives and carries out loopback for forwarding source identifier；And priority level initializing changing unit, its switching described at least 1 exchange The forwarding control mode of the frame in formula hub, so that entering along the communication path shown in the information received from described router The forwarding of the frame that row sends/receives controls, and is according to the priority shown in the priority data received together with this information Carrying out, described at least 1 communication terminal has: neighbouring device information memory cell, and it is received as contract with described claim frame Machine, is carried out the source identifier that forwards given in this claim frame as the neighbouring device information of described at least 1 communication terminal Storage；And priority notification unit, it is being written with described in expression the excellent of data communication that at least 1 communication terminal carried out In the described priority notification frame of the priority data of first level and the neighbouring device information of described at least 1 communication terminal, make The mailing address of at least 1 communication terminal described in giving for forwarding source identifier, and carry out loopback.

In above-mentioned communication system, if prestoring the data representing that this communication terminal is carried out in each communication terminal The priority data of priority of communication, the then each switch hub from the communication path of router to this communication terminal Frame forwards the setting of the priority in controlling automatically to change.Therefore, according to above-mentioned communication system, it is not necessary to Xiang Gejiao The formula hub of changing particularly sets operation, and each switch hub can be made corresponding to the data performed by each communication terminal Communication priority and carry out forward control.

Alternatively, it is also possible to it is preferential corresponding to receive from described router to be configured to described priority level initializing changing unit DBMS, switches QoS(Quality of Service) set and VLAN(Virtual Local Area Network) set In at least one set.

Will be located in receiving from described router alternatively, it is also possible to be configured to described priority level initializing changing unit receiving In the case of the communication terminal of the end of the communication path shown in information arrived is as the frame of transmission source, rewrite this packet Head, so that the packet in the 3rd layer of OSI Reference Model of the packet write to the payload portion of this frame turns Send out and control, correspond to the priority shown in this priority data and carry out.According to aforesaid way, it is possible to expect for from road The packet sent to other networks by device, the forwarding of the 3rd layer in these other networks is preferentially processed when controlling.? This, is as so that the concrete example of the head forwarding the mode that uprises of priority when controlling to rewrite this packet at the 3rd layer, Can enumerate DSCP(Diff Serv Code Point) value or CoS(Class of Service) value or TOS(Type Of Service) value be rewritten as represent high priority value.

It addition, for solving above-mentioned problem, another mode of the present invention provides a kind of router, and it will be for comprising 1 Or multiple switch hub and be connected with some of one or more switch hubs described respectively one or more lead to Letter terminal has network under its command at interior, is connected with other networks, and this router is characterised by having: multicast unit, it is in request As forwarding source identifier to give the mailing address of described router in frame, and this claim frame is multicast to described network Transmitting, wherein, this claim frame is used for, and asks respectively to send to one or more switch hubs described to represent to this switch type Hub has carried out the neighbouring device information of the communicator that frame forwards, and asks respectively to one or more communication terminals described to send out Send the priority data of the priority of the expression data communication that this communication terminal is carried out and the neighbouring device letter of this communication terminal Breath；And priority level initializing control unit, its at least 1 communication terminal received from one or more communication terminals described is Notify the described priority of this communication terminal and neighbouring device information and the priority notification frame of loopback and from described 1 Or at least 1 switch hub in multiple switch hub is in order to notify the neighbouring device information of this switch hub And the neighbouring device notification frame of loopback, determine from described router to described at least 1 communication terminal for each communication terminal Switch hub on communication path, the switch hub on each communication path sends the end being positioned at this communication path The priority data of the communication terminal at place and represent the information of this communication path, send corresponding to shown in this priority data is excellent First level and the frame that carries out sending/receive along this communication path forward the instruction controlled.By by router as above with Described switch hub and described communication terminal are combined such that it is able to constitute described communication system.

It addition, as another mode of the present invention, it is also contemplated that provide one to comprise and described multicast unit and priority The corresponding operation of setup control unit is at interior communication means.By the program comprising above-mentioned communication means is arranged on generally Computer in, make the control portion of this computer carry out action according to this program such that it is able to make this computer as the present invention Router acts.It addition, by installing described program in common router, make the route test portion of this router by Action is carried out such that it is able to give the function showing the feature of router of the present invention significantly common according to described program In router.Additionally, as the concrete presentation mode of described program, it is contemplated that such as write to CD-ROM(Compact Disk-Read Only Memory) or DVD(Digital Versatile Disc) etc. the storage medium of embodied on computer readable In and the mode issued, or by the way of being downloaded by electrical communication lines such as the Internets and issuing.

It addition, for solving described problem, another mode of the present invention provides a kind of switch hub, its with 1 or Multiple communication terminals connect, and are included in the network that router has under its command, and this switch hub is characterised by having: adjacent Equipment list, its neighbouring device information that to described switch hub, expression has been carried out the communicator that frame forwards is deposited Storage；Frame forwards control unit, and it gives in the case of having forwarding source identifier in this reception frame, by this forwarding source identifier After in neighbouring device information write to described neighbouring device table, this forwarding source identifier is rewritten as described switch type line concentration The mailing address of device and transmission target corresponding to this frame carries out forwarding control；Neighbouring device notification unit, it is receiving Frame be in order to ask send represent to this switch hub forwarded frame communicator neighbouring device information and from described In the case of the claim frame that router sends, generate the phase of the neighbouring device information being written with in described neighbouring device table storage Adjacent equipment notification frame, gives the mailing address of described switch hub and carries out loopback for forwarding source identifier；And it is excellent First level sets changing unit, and it switches the forwarding control mode of the frame in this switch hub, so that along from described route The forwarding of the frame that the communication path shown in information that device receives is transmitted/receives controls, and is to connect according to together with this information The priority shown in priority data that receives and carry out.By by above-mentioned switch hub with to have described multicast single Unit and the router of priority level initializing control unit and described communication terminal are combined such that it is able to constitute described communication system System.It addition, in another mode of the present invention, it is considered to provide a kind of comprise with storage neighbouring device information memory element, Frame forwards control unit, neighbouring device notification unit and the corresponding operation of priority level initializing changing unit interior communication party Method.

It addition, for solving described problem, another mode of the present invention provides a kind of communication means, it is used for communication system In, in this communication system, comprising as communicator: router, it is for being connected the network having under its command with other networks；1 Individual or multiple switch hubs, it is included in the network that described router has under its command；And one or more communication terminals, its Being connected with some of one or more switch hubs described respectively, this communication means is characterised by, from described route Device, as forwarding source identifier to give the mailing address of described router in claim frame, and by this claim frame to described net Network carries out multicast and transmits, and wherein, this claim frame is used for, and ask to send expression respectively this leads to one or more communication terminals described Priority data and the expression of the priority of the data communication that letter terminal is carried out have carried out the logical of frame forwarding to this communication terminal The neighbouring device information of T unit, asks to send this switch hub to one or more switch hubs described respectively Neighbouring device information, composes in the frame that at least 1 switch hub in one or more switch hubs described receives In the case of having given forwarding source identifier, in using this forwarding source identifier as the write of neighbouring device information to neighbouring device table After, this forwarding source identifier is rewritten as described at least 1 switch hub mailing address and corresponding to the transmission of this frame Target carries out forwarding control, is the institute sent from described router at the frame received by described at least 1 switch hub In the case of stating claim frame, generate the neighbouring device notice of the neighbouring device information being written with in described neighbouring device table storage Frame, gives the mailing address of described at least 1 switch hub and carrying out back to described router for forwarding source identifier Send, at least 1 communication terminal in one or more communication terminals described, with receive from described router send described in please Seeking frame is opportunity, forwards source identifier as the neighbouring device letter of described at least 1 communication terminal using give in this claim frame Breath stores, at the priority number of the priority being written with described in expression the data communication that at least 1 communication terminal is carried out According in the priority notification frame with the neighbouring device information of described at least 1 communication terminal, give as forwarding source identifier The mailing address of described at least 1 communication terminal, and carry out loopback to described router, described router receive from described at least The described priority notification frame of 1 communication terminal loopback and described adjacent from described at least 1 switch hub loopback Equipment notification frame, determine from described router to the communication path of described at least 1 communication terminal for each communication terminal Switch hub, the switch hub on each communication path sends and sets change instruction frame, this setting change instruction frame The priority data comprising the communication terminal of the end being positioned at this communication path and the information representing this communication path, from described Router receives the switch hub of described setting change instruction frame, switches the forwarding control of frame in this switch hub Mode processed, so that the forwarding control of the frame being transmitted along the communication path shown in described setting change instruction frame/receiving, be Carry out according to the priority shown in the priority data received.

Accompanying drawing explanation

Fig. 1 is the figure of the structure example of enterprise's internal information system of the 1st embodiment representing the present invention.

Fig. 2 is the figure of the structure example of the communication terminal 40 representing that the system of Fig. 1 comprised.

Fig. 3 is the flow chart of the flow process of the process of the priority notification performed by control portion 410 representing communication terminal 40.

Fig. 4 is the number representing the frame being transmitted/receiving in the network that the router 60 that the system at Fig. 1 is comprised has under its command Figure according to an example of structure.

Fig. 5 is the figure of the structure example of the switch hub 50 representing that the system of Fig. 1 comprised.

Fig. 6 is the flow process of the flow process of the process that the switching engine portion 520 representing switch hub 50 performs according to firmware Figure.

Fig. 7 is the figure of the structure example representing router 60.

Fig. 8 is the stream that the routing engine portion 620 representing router 60 processes according to the priority level initializing control that firmware performs The flow chart of journey.

Fig. 9 is the figure of an example of the annexation representing each device in LAN1A.

Figure 10 is the figure of the action for the 1st embodiment is described.

Figure 11 is the figure of the action for the 1st embodiment is described.

Figure 12 is the figure of the effect for embodiment is described.

Figure 13 is the figure of the structure example of the LAN1C of the 2nd embodiment representing this 1st invention.

The figure of the network topology of LAN1C that Figure 14 is the topological data generated according to router 60A for explanation and grasps.

Detailed description of the invention

Below, referring to the drawings, embodiments of the present invention are illustrated.

＜ the A: the 1 embodiment ＞

＜ A-1: structure ＞

Fig. 1 is the figure of the structure example of the communication system representing an embodiment of the invention.This communication system is described Enterprise's internal information system, is to be connected to mutually by LAN i.e. LAN1A and LAN1B in the site of the site layings such as the branch company in enterprise The IP networks such as networking and constitute.As it is shown in figure 1, LAN1A comprises router 60A, 2 switch hub (switch hubs 50A and 50B), 3 communication terminals (communication terminal 40A, 40B and 40C), and be connected to IP network via router 60A.Such as Fig. 1 institute Showing, on router 60A, connection has switch hub 50A, on switch hub 50A connection have switch hub 50B and Communication terminal 40A.Further, on switch hub 50B, connection has communication terminal 40B and 40C.On the other hand, LAN1B comprises road By device 60B, switch hub 50C, 3 communication terminals (communication terminal 40D, 40E and 40F), and connect via router 60B To IP network.As it is shown in figure 1, connection has switch hub 50C on router 60B, switch hub 50C is connected to Communication terminal 40D, 40E and 40F.

Shown in Fig. 16 communication terminal e.g. personal computer, all has identical structure.Below, need not divide In the case of not distinguishing these 6 communication terminals, it is labeled as " communication terminal 40 ".Shown in Fig. 13 switch hub also has Identical structure, in the case of need not distinguishing these 3 switch hubs respectively, is labeled as " switch hub 50 ".Phase With ground, router 60A and 60B shown in Fig. 1 the most also has identical structure, need not distinguish these 2 routers respectively In the case of, it is labeled as " router 60 ".

Communication terminal 40 (is connected to IP network via router 60, by router 60 by the network having under its command with router 60 Be set to the network of default gateway, be then LAN1A for router 60A, be then LAN1B for router 60B) included in friendship Change formula hub 50 to connect, thus house in the network.The communication terminal 40 being housed in the network that router 60 has under its command exists With other communicator (in other the communication terminal being such as housed in LAN1A or the site being housed in other in LAN Communication terminal or the www server etc. being connected with IP network) between carry out data communication.If illustrated in greater detail, then at figure In the communication terminal of shown in 16, communication terminal 40A, 40B, 40D and 40E are to carry out sending out of voice data bag according to VoIP respectively The VoIP terminal sent/receive.Here, so-called voice data bag refers to, would indicate that the sound number of the sound of speaking of terminal user The packet write to payload portion according to being compressed coding.In these 4 VoIP terminals, communication terminal 40B and 40E For common audio communications such as teleconferences, communication terminal 40A and 40D is such as only used for the urgent sound such as fire despatch and leads to Letter.It addition, communication terminal 40C and 40F e.g. carry out according to HTTP transmission/reception of text data etc. except voice data it The terminal of the transmission/reception of outer data.

Switch hub 50 is the relay relayed data communication in the 2nd layer, transmission mesh based on frame Mark MAC Address carries out forwarding control.Router 60 is the relay relayed data communication in the 3rd layer.Such as with Lower situation, i.e. if the transmission target ip address of packet that router 60 receives from IP network is the net that this router has under its command The IP address of the communication terminal 40 housed in network, then by this packet to the forwarded having under its command, at this transmission target ip address In the case of not being the IP address of the communication terminal 40 being housed in the network having under its command, forward according to the storage content of routing table To other routers.

As noted above, LAN1A and LAN1B shown in Fig. 1 each in, each communication terminal carry out common sound lead to Letter, urgent audio communication and these 3 kinds of data communication of the data communication in addition to audio communication.This 3 kinds of data communication preferential Level is different from each other.Specifically, it is following situation, i.e. the urgent audio communication that communication terminal 40A or 40D is carried out preferential Level is the highest, and the priority of the audio communication that communication terminal 40B or 40E is carried out is second highest, and communication terminal 40C or 40F is carried out The priority of data communication is minimum.Therefore, at LAN1A(or LAN1B) in, it is necessary to the frame carried out in each switch hub 50 turns Send out the setting controlled, so that communication terminal 40A(or communication terminal 40D) forwarding of frame that sends/receive most preferably carries out, Communication terminal 40B(or communication terminal 40E) forwarding of frame that sends/receive carries out with second highest priority, in router 60 Packet forwards the setting controlled also to be identical.

Currently, for above-mentioned setting, it is common that by LAN1A(or LAN1B) running management personnel carry out in a manual manner 's.Corresponding thereto, in the present embodiment, by making communication terminal 40, switch hub 50 and router 60 perform respectively Show the process of the feature of present embodiment significantly such that it is able to automatically carry out turning for the frame of switch hub 50 Send out the setting controlled, and the packet for router 60 forwards the setting controlled.Below, to communication terminal 40, switch type Hub 50 and router 60 are described in detail.

Structure ＞ of ＜ A-1-1: communication terminal 40

Fig. 2 is the block diagram of the structure representing communication terminal 40.As in figure 2 it is shown, communication terminal 40 comprises: control portion 410, logical Letter interface (hereinafter referred to as I/F) portion 420, user I/F portion 430, storage part 440 and as the data transmit-receive between these structural elements The bus 450 of intermediary.Control portion 410 is CPU, is stored in the program in storage part 440 and as communication terminal by execution The control axis of 40 works.Communication I/F portion 420 e.g. NIC(Network Interface Card).Communication I/F portion 420 Receive the Data Concurrent forwarded from the switch hub 50 as its linking objective to deliver to control portion 410, on the other hand, incite somebody to action The data sent from control portion 410 are sent to this switch hub 50.

User I/F portion 430 comprises: for carrying out the sound input/out parts of the input/output of sound, showing various picture The display part in face, numeral keys etc. carry out the operating portion (all omitting diagram) of input of various data for making user.In communication eventually In end 40A, 40B, 40D and 40E, input the sound of user via user I/F portion 430, and carry out the output of conversation object sound. It addition, in communication terminal 40C and 40F, carry out the various data (text data sent to the other side via user I/F portion 430 Deng) input/output.

As in figure 2 it is shown, storage part 440 comprises non-volatile memories portion 442 and volatile storage portion 444.Non-volatile deposit Storage portion 442 e.g. hard disk.In this non-volatile memories portion 442, storage have for according to VoIP carry out audio communication or by The signal procedure (omitting diagram in fig. 2) of the transmission/reception etc. of text data is carried out according to HTTP.It addition, deposit non-volatile In storage portion 442 storage have for make control portion 410 perform priority notification procedure that priority notification shown in Fig. 3 processes and Represent the priority data of the priority of this data communication performed by communication terminal 40.The process that this priority notification is processed Content illustrates later.In the present embodiment, the data used as priority data are in " 0 ", " 1 " or " 2 " Certain value.If illustrated in greater detail, then prestore as " 0 " at communication terminal 40A and 40D medium priority data, logical Letter terminal 40B and 40E medium priority data prestore as " 1 ", deposit in advance at communication terminal 40C and 40F medium priority data Storage is " 2 ".That is, the value of the priority data of present embodiment is the least, and represented priority is the highest.Priority data to non-easily Lose property storage part 442 write such as by user I/F portion 430 is operated and by communication terminal 40 user or house should The running management personnel of the network of communication terminal 40 are carried out in advance.

Volatile storage portion 444 e.g. RAM(Random Access Memory), as performing signal procedure or preferential Working region during the various programs such as level advising process uses.It addition, as in figure 2 it is shown, store phase in volatile storage portion 444 Adjacent facility information.Here, so-called neighbouring device information, refer to represent the relaying dress of the forwarding having carried out frame to this communication terminal 40 The information put (in the present embodiment, is the MAC ground of switch hub 50 of linking objective as this communication terminal 40 Location).Although can be described in detail below, but the write that neighbouring device information is to volatile storage portion 444 is in priority Carry out during the execution of advising process.Below, the place processed at the priority notification performed according to priority notification procedure Before the detailed description of reason content, the data configuration of the frame being transmitted/receiving in the network that router 60 has under its command is carried out Explanation.

Fig. 4 (A) is the data configuration representing the common frame being transmitted/receiving in the network that router 60 has under its command Figure.As shown in Figure 4 (A), frame has head and payload portion.In head, storage sends destination-mac address, transmission source MAC Address and category identifier.The so-called destination-mac address that sends refers to become the MAC Address of the equipment of the transmission target of this frame, institute Meaning transmission source MAC Address refers to have sent the MAC Address of the equipment of frame.So-called category identifier refers to represent the classification of this frame The data of (being such as written with what type of packet etc. in payload portion).

In the frame being transmitted/receiving in the network that router 60 has under its command, as showing present embodiment significantly The frame of feature, enumerated claim frame, priority notification frame, neighbouring device notification frame and set change instruction frame these 4 kinds.About These 4 kinds of frames, be written with as category identifier common value (relative to the frame relevant to audio communication or with text data The frame that data communication is relevant, is different values).So-called claim frame refers to, router 60 is received in order in the network had jurisdiction over downwards respectively The loopback of the communication terminal 40 Request Priority notification frame held, the switch hub 50 comprised in consolidated network is asked adjacent The loopback of equipment notification frame and carry out, to the network having under its command, the frame that multicast transmits.So-called priority notification frame refers to, as with institute State response corresponding to claim frame and by the frame of communication terminal 40 loopback (clean culture transmission), so-called neighbouring device notification frame refers to, make For the response corresponding with described claim frame by switch hub 50 to the transmission source loopback (clean culture transmission) of this claim frame Frame.Below, in the case of without distinguishing neighbouring device notification frame and priority notification frame, simple marking is " notification frame ".And And, the so-called change instruction frame that sets refers to, router 60 in order to indicate frame forward priority in controlling setting change and to The frame that the switch hub 50 comprised in the network having under its command sends.

Fig. 4 (B) is the figure of the data configuration in the payload portion representing claim frame.As shown in Fig. 4 (B), at claim frame Payload portion is written with transmission destination-mac address, transmission source MAC Address, message category identifier and forwards source identifier. The transmission destination-mac address in the payload portion of claim frame is identical with the transmission destination-mac address of write in the head of this frame, Transmission source MAC Address about this payload portion is also identical situation.Being provided with expression in message category identifier should Frame is which the value in the frame of described 4 types.The most following situation, i.e. using as message category identifier In the case of character code data, in claim frame, message category identifier is provided with the word of expression " 1 " (or " A ") respectively Symbol, is provided with the character code of expression " 2 " (or " B "), at neighbouring device in priority notification frame as message identifier Notification frame is provided with the character code of expression " 3 " (or " C ") as message identifier, as report in setting change instruction frame Literary composition category identifier and be provided with the character code of expression " 4 " (or " D ").In forwarding source identifier, when the transmission of claim frame The MAC Address of its transmission source is set, when being carried out the forwarding of this frame by switch hub 50 every time, is rewritten as having carried out this turn The MAC Address of the switch hub 50 sent out.Detailed content describes later, switch hub 50 and communication terminal 40 In the case of receiving claim frame, by referring to the forwarding source identifier of this claim frame, it is possible to determine and carry out to this device The relay of the forwarding of this claim frame.

Fig. 4 (C) is the figure of the data configuration in the payload portion representing neighbouring device notification frame.As shown in Fig. 4 (C), Except sending destination-mac address, transmission source MAC Address, message category identifier in the payload portion of neighbouring device notification frame And outside forwarding source identifier, also it is written with neighbouring device information list.Detailed content describes later, and what is called is adjacent to be set Standby information list refers to the equipment of the forwarding representing that the transmission source switch hub to this neighbouring device notification frame has carried out frame MAC Address and the COM1 receiving this frame between the information of corresponding relation.Fig. 4 (D) is to represent priority notification frame The figure of data configuration in payload portion.As shown in Figure 4 (D) shows, except sending in the payload portion of priority notification frame Outside destination-mac address, transmission source MAC Address, message category identifier and forwarding source identifier, also it is written with this priority and leads to Know neighbouring device information and the priority data of the transmission source communication terminal 40 of frame.Detailed content describes later, route Device 60 and switch hub 50, in the case of receiving these notification frame, identify by referring to the forwarding source of this notification frame Symbol, it is possible to determine the device of the forwarding having carried out this notification frame to this device.

Fig. 4 (E) is the figure of the data configuration representing the payload portion setting change instruction frame.As shown in Fig. 4 (E), Set in the payload portion of change instruction frame except sending destination-mac address, transmission source MAC Address, message category identifier Outside, also it is written with setting change instruction data.In setting change instruction data, include expression become for as this setting The more switch hub 50 of the transmission target of instruction frame strains port identifiers and the table of the more preferably COM1 that level sets Show the priority data of this priority.It is above the data structure of the frame being transmitted/receiving in the network that router 60 has under its command Make.

It follows that with reference to Fig. 3, the detailed content processing priority notification illustrates.This priority notification process with Being received as opportunity and perform of claim frame.Here, whether be claim frame for receiving frame, as long as effectively bearing with reference to this reception frame In load portion write message category identifier and carry out judging.As it is shown on figure 3, in priority notification processes, control portion Forwarding source identifier in the 410 payload portions that first will be written in the claim frame received is write as neighbouring device information Enter to volatile storage portion 444 (step SA100).Then, control portion 410 generates described priority notification frame, to described The transmission source loopback (clean culture transmission) (step SA110) of claim frame.The priority of control portion 410 loopback in this step SA110 In the payload portion of notification frame, as forwarding source identifier to be written with the MAC Address of this communication terminal 40 and effective at this Load portion is written with in volatile storage portion 444 in the neighbouring device information and non-volatile memories portion 442 stored and stores Priority data.

It is above the structure of communication terminal 40.

Structure ＞ of ＜ A-1-2: switch hub 50

Fig. 5 is the block diagram of the structure representing switch hub 50.As it is shown in figure 5, switch hub 50 has: communication I/F portion 510, switching engine portion 520 and storage part 530.Communication I/F portion 510 has multiple COM1.Above-mentioned multiple communication ends Mouth respectively via communications cables such as such as 100BASE-T with other communicators (in the present embodiment, for router 60 Or other switch hubs 50, or communication terminal 40) connect.Respectively in above-mentioned multiple COM1s, in advance to each The port identifiers (such as, port numbering) that COM1 distribution is intrinsic, uses this port identifiers can uniquely identify respectively COM1.The frame received via each COM1 is sent to exchange engine part 520 by communication I/F portion 510, on the other hand, The frame that will send from switching engine portion 520, sends from the COM1 indicated by this switching engine portion 520.

Storage part 530 comprises volatile memory and the EPROM(Erasable Programmable Read such as such as RAM Only Memory) etc. nonvolatile memory (the most all omitting diagram).This nonvolatile memory prestores There are firmware (program), this firmware (program) to be used for making switching engine portion 520 perform substantially and show switch hub of the present invention The process of feature.On the other hand, volatile memory is used as to perform working area during above-mentioned firmware by switching engine portion 520 Territory.It addition, above-mentioned volatile memory plays the work of the buffer for the temporary transient frame storing and being received by communication I/F portion 510 With, and, this volatile memory stores the mac address table of Fig. 5 and the neighbouring device table of this Fig. 5.

The mac address table of Fig. 5 does not has the most not compared with the mac address table that existing switch hub is had With.In this mac address table, it is associated with the transmission source MAC Address of the frame received by communication I/F portion 510 and has stored and connect Receive the port identifiers of the COM1 of this frame.The action that MAC Address and port identifiers are write to mac address table, companion Along with frame described later forwards control to carry out.Such as, sending from communication terminal 40 to resolve the MAC Address of router 60 The frame of frame (being written with ARP(Address Resolution Protocol in payload portion) packet come) forwarding During, perform the end of the transmission source MAC Address (that is, the MAC Address of communication terminal 40) of this frame with the receiving port of this frame The process that mouth identifier is associated and writes in mac address table.On the other hand, at the repeating process of the response frame corresponding with this frame In, perform the port-mark of the transmission source MAC Address (that is, the MAC Address of router 60) of this frame with the receiving port of this frame The process that symbol is associated and writes in mac address table.The storage content of this mac address table is being entered based on transmission destination-mac address The forwarding of row frame is used when controlling.

In neighbouring device table, relevant to each port identifiers of multiple COM1s that communication I/F portion 510 is had Joining and store and have linking objective identifier (in the present embodiment, for the MAC Address of this communicator), this linking objective identifies Symbol illustrates the forwarding source communications apparatus of the frame received via this COM1 uniquely.This neighbouring device table is with switch type collection The power supply of line device 50 (omitting diagram) is connected as opportunity, is set to NULL(0x00 with each linking objective identifier) state generate 's.Further, predetermined particular frame is carried out with switch hub 50 (in the present embodiment, for above-mentioned claim frame and notice Frame) relaying together, carry out the renewal of storage content of this table (that is, by the port mark with the COM1 receiving above-mentioned frame Know the corresponding linking objective identifier of symbol and be rewritten as the forwarding source identifier of this frame).

Switching engine portion 520 e.g. CPU(Central Processing Unit).Switching engine portion 520 is by performing The firmware of storage in storage part 530, thus the control axis as switch hub 50 works.Move according to this firmware The switching engine portion 520 made is when receiving frame via certain COM1 every time, by this frame write to volatile memory In buffer, it is respectively directed to above-mentioned frame and performs the process shown in flow chart of Fig. 6.As shown in Figure 6, as switching engine portion 520 The process performed according to above-mentioned firmware, has enumerated frame and has forwarded control process, neighbouring device notification frame transmission process and priority to set Determine change and process these 3 kinds.

As shown in Figure 6, switching engine portion 520 is effective with it with reference first to the transmission destination-mac address of the head receiving frame The message category identifier of load portion and judge whether this frame received is the setting change instruction frame (step sent to this device Rapid SB100).That is, it is the MAC Address of this device and message category identifier represents that setting change refers to sending destination-mac address In the case of showing frame, the result of determination of above-mentioned steps SB100 is "Yes".Further, switching engine portion 520 sentencing in step SB100 Determining in the case of result is "Yes", execution priority sets change and processes (step SB110), otherwise, in the judgement of step SB100 In the case of result is "No", performs frame and forward control to process.

Frame performed in the case of the result of determination of step SB100 is "No" forwards control to process, and comprises based on connecing Receive the sending destination-mac address of frame and carry out the process (step SB190) forwarding control of this reception frame.Here, what is called based on The forwarding receiving the sending destination-mac address of frame and carry out controls to refer to, is not unicast address at this transmission destination-mac address In the case of, maybe this transmission destination-mac address be not in mac address table storage unicast address in the case of, carry out this reception frame Flood, on the other hand, this transmission destination-mac address be in mac address table storage unicast address in the case of, this is connect Receive frame only to send from the COM1 shown in the port identifiers being associated with this MAC Address and be stored in mac address table.? This, as not being the MAC Address of unicast address, enumerated multicast address or broadcast address.Refer to from reception it addition, what is called floods Whole COM1s outside the COM1 of reception frame send this reception frame.Carry out based on this transmission destination-mac address Forward control to control with the forwarding in existing switch hub compared with the most not different.In other words, existing In switch hub, forward control to process as frame and only perform forwarding based on described transmission destination-mac address control (i.e., The process of step SB190).

Priority level initializing change performed in the case of the result of determination of step SB100 is "Yes" processes, and is basis Send the instruction come from router 60 and will carry out step for each frame the buffer accumulated in volatile memory The priority during process of SB190 carries out the process changed.The priority level initializing change of present embodiment processes and comprises VLAN Change and the setting of QoS that (Virtual Local Area Network) sets are changed.Here, so-called VLAN set refer to by From router 60 receive the COM1 of the change instruction carrying out priority level initializing remove from the object flooded and virtually will The network segment separates.Being set by VLAN, the multicast address received via the COM1 of other network segments will not be to carrying out the network segment The COM1 separated is sent, and therefore, the data communication performed via this COM1 will not hampering by the forwarding of multicast frames Hinder.On the other hand, so-called QoS refers in the process of step SB190, is carrying out frame to the communication sending target corresponding to it During the process that port is sent, in buffer, accumulation has the period of the higher frame of priority compared with this frame, suspends sending of this frame. By carrying out above-mentioned QoS, it is possible to avoid the forwarding of frame being assigned high priority to control to be controlled by the forwarding of the frame of low priority System hinders.In the priority level initializing change of present embodiment processes, switching engine portion 520 is for being instructed to priority to be set For the COM1 of " 0 ", it being set for the separation of the network segment by above-mentioned VLAN, and, will connect about via this COM1 Priority level initializing in the QoS of the frame (or being sent to the frame of this COM1) received is for the highest.It addition, for be instructed to should be by Priority is set to the COM1 of " 1 ", and switching engine portion 520 only carries out the setting change of QoS, by the priority level initializing in QoS For second highest.

The frame of present embodiment forwards control to process in addition to the process of above-mentioned step SB190, also comprises step The process of SB120 to SB160.As it is shown on figure 3, switching engine portion 520 first judge in the payload portion of this reception frame be No being written with forwards source identifier (step SB120).Here, as to whether being written with in the payload portion receiving frame turn Rise the concrete decision method of identifier, it is contemplated that multiple method.For example, it may be directly with reference to the payload receiving frame This region in portion, is equivalent to the content of MAC Address by whether be written with and carry out the mode judged, furthermore it is possible to be to pass through Whether receive frame is the mode that some of claim frame, neighbouring device notification frame and priority notification frame carries out judging.As above institute State, in the frame being transmitted/receiving in the network that router 60 has under its command, payload portion is written with forwarding source identifier Be only claim frame, neighbouring device notification frame and priority notification frame these 3 kinds.Such as, in the case of later mode, connecing Receive the category identifier of write in the head of frame and represent the frame of described 4 types, and be written in the message in its payload portion Category identifier represent claim frame, neighbouring device notification frame or priority notification frame some in the case of, step SB120 Result of determination is "Yes".

In the case of the result of determination of step SB120 is "No", switching engine portion 520 with reference to receive frame head send out Send destination-mac address and category identifier, whether be to send to IP network from the network having under its command for audio communication to this reception frame The audio communication frame (that is, being written with the frame of voice data bag in payload portion) gone out carries out judging (step SB130).Example As, receive frame send MAC Address that destination-mac address is not the communication terminal 40 housed in the network that has under its command of this device, And in the case of the category identifier of this reception frame illustrates VoIP, the result of determination of step SB130 is "Yes".Switching engine portion 520 in the case of the result of determination of step SB130 is "Yes", by the sound in the payload portion being written in this audio communication frame The DSCP value of sound packet, carries out rewriting (step SB140) corresponding to the priority of its transmission source, then, performs step The process of SB190.Otherwise, in the case of the result of determination of step SB130 is "No", switching engine portion 520 does not carry out step The process of SB140, and it is carried out the process of step SB190.So-called DSCP value represents and carries out voice data bag in the 3rd layer The value of priority when forwarding controls.Detailed content describes later, by carrying out in advance in switch hub 50 The rewriting of DSCP value, thus for being sent to the voice data bag of IP network from router 60, it is possible to expect the packet in IP network Forward and control to correspond to the priority of the communication terminal 40 as its transmission source and carry out.Additionally, in the present embodiment, For being sent to the voice data bag of IP network from router 60, preferential in order to corresponding to the communication terminal 40 as its transmission source Level and carry out packet in IP network and forward and control, carried out the rewriting of DSCP value, but CoS value or TOS can certainly have been used Other indexs such as value.

Corresponding thereto, in the case of the result of determination in step SB120 is "Yes", (that is, receiving frame is claim frame, priority In the case of some of notification frame or neighbouring device notification frame), switching engine portion 520 by with the communication receiving this reception frame The neighbouring device identifier that the port identifiers of port is associated and is stored in neighbouring device table is rewritten as turning of this reception frame Rise identifier (step SB150), and, the source identifier that forwards of this reception frame is rewritten as the MAC Address (step of this device SB160).Then, with reference to the message category identifier in the payload portion of reception frame, switching engine portion 520 judges that receiving frame is No is claim frame (step SB170), in the case of this result of determination is for being, processes performing neighbouring device notification frame transmission After (step SB170), perform the process of step SB190.In neighbouring device notification frame transmission processes, switching engine portion 520 is raw Become above-mentioned neighbouring device notification frame, and to the transmission source loopback (clean culture transmission) of above-mentioned claim frame.As neighbouring device information List and will be led to this neighbouring device by the storage content write processing the neighbouring device table after updating of above-mentioned steps SB150 Know in the payload portion of frame.Otherwise, in the case of the result of determination of step SB170 is "No", switching engine portion 520 does not holds The process of row step SB180, and perform the process of step SB190.

Structure ＞ of ＜ A-1-3: router 60

Fig. 7 is the block diagram of the structure representing router 60.As it is shown in fig. 7, router 60 has: communication I/F portion 610, road By engine part 620 and storage part 630.Communication I/F portion 610 has many with the communication I/F portion 510 of switch hub 50 identically Individual port, each port assignment has intrinsic port identifiers.2 difference such as in router 60A, in above-mentioned multiple ports It is connected with IP network and switch hub 50A.Communication I/F portion 610 identically with the I/F portion 510 that communicates, will be via each COM1 The frame received sends to routing engine portion 620, and on the other hand, the frame that will send from routing engine portion 620, from by this route The COM1 of engine part 620 instruction is sent.

Storage part 630 also with the storage part 530 of switch hub 50 identically, includes the volatile memory such as RAM With the nonvolatile memory such as EPROM (omitting diagram).In this nonvolatile memory, storage has firmware.In present embodiment In, by making routing engine portion 620 action realize substantially showing the router 60 of present embodiment feature according to this firmware Function.On the other hand, volatile memory is used as to perform working region during above-mentioned firmware by routing engine portion 620, and, Play the effect of the buffer of the frame (or packet) arrived for temporary transient accumulative reception.It addition, deposit in this volatile memory Storage routing table shown in Fig. 7, about the mac address table of this router 60 and these tables of neighbouring device table.

Routing engine portion 620 is identical with the switching engine portion 520 of switch hub 50, is CPU.Routing engine portion 620 Performing the firmware of storage in storage part 630, the control axis as router 60 works.Routing engine portion 620 is according to above-mentioned Firmware, performs packet and forwards control process, multicast transmission process, annexation to determine that process and priority level initializing control process These 4 kinds process.In processing at above-mentioned 4 kinds, it is compared with prior art the most different that packet forwards control to process.Cause This, below, to multicast transmission process, annexation determine that process and priority level initializing control to be processed as center and illustrate.

Multicast transmission process be claim frame is had under its command to router 60 network (if router 60A is then for LAN1A, If router 60B is then for LAN1B) carry out the process that multicast transmits.Detailed content describes later, this embodiment party In formula, this multicast transmission processes after the power supply (omitting diagram) of router 60 is connected, often through stipulated time T(such as, and 3 seconds) And periodically carry out.

In annexation determines process, routing engine portion 620 is first to send leading to from each switch hub 50 That knows frame is received as opportunity, is stored in adjacent setting by being associated with the port identifiers of the COM1 receiving this notification frame Linking objective identifier in standby table is rewritten as the forwarding source identifier being written in the payload portion of this frame.Further, route The engine part 620 storage content according to the neighbouring device table of this device, the neighbouring device from the loopback of each switch hub 50 are believed Breath list and the neighbouring device information from communication terminal 40 loopback, and generate the connection of each device represented in the network having under its command The topological data of relation (network topology).

If illustrated in more detail, then routing engine portion 620 neighbouring device based on this device table storage content, Neighbouring device information list from switch hub 50 loopback and the neighbouring device information from communication terminal 40 loopback, for This device, each switch hub 50 and each communication terminal 40 and generate respectively by the 1st pointer and one or more the 2nd pointer structures The tectosome data of the bi-directional list structure become, using the set of these tectosome data as above topology data, wherein, the 1st Pointer (such as, represents the port identifiers of COM1 being connected with upstream side neighbouring device and this upstream side neighbouring device The data etc. of MAC Address) represent that upstream side neighbouring device, the 2nd pointer (such as, represent that be connected with downstream neighbouring device leads to The port identifiers of letter port and the data etc. of the MAC Address of this downstream neighbouring device) represent downstream neighbouring device.? This, so-called upstream side neighbouring device refers to that the neighbouring device close to router 60 side, so-called downstream neighbouring device refer to The neighbouring device of this router 60 side.Such as, in the LAN1A of Fig. 1, the upstream side neighbouring device of switch hub 50A is Router 60, downstream neighbouring device is communication terminal 40A and switch hub 50B.Additionally, about such as the route of Fig. 1 Device 60 does not so have in the tectosome data of the device of upstream side neighbouring device, arranges NULL, phase in above-mentioned 1st pointer With ground, in about the tectosome data of device not having downstream neighbouring device as the communication terminal 40 of Fig. 1, above-mentioned 2nd pointer arranges NULL.

In the case of the set of the tectosome data of above-mentioned bi-directional list structure is used as topological data, from When upstream side uses the 2nd pointer, downstream side to use the 1st pointer to explore adjacent one another are 2 device, all must be able to not produce Contradiction.Such as, in the topological data relevant to the LAN1A of Fig. 1, it is necessary to by the tectosome corresponding with switch hub 50A 2nd pointer of data illustrates switch hub 50B, by the 1st pointer of the tectosome data corresponding with switch hub 50B Switch hub 50A is shown.Although it is thus possible, for instance notifying as neighbouring device from switch hub 50B there occurs Switch hub 50A, but not from switch hub 50A notify as neighbouring device switch hub 50B this In the case of planting contradiction, routing engine portion 620 is not only producing generation topological data in the range of contradiction.

It follows that with reference to Fig. 8, the process content that priority level initializing control processes is described.This priority level initializing control processes It it is the process performed with being received as opportunity of priority notification frame.Fig. 8 is to represent the flow process that priority level initializing control processes Flow chart.As shown in Figure 8, routing engine portion 620 judges the transmission as this priority notification frame with reference first to topological data Whether the communication path between communication terminal 40 and this device in source is determined (step SC100).If in more detail Bright, then can be according to the tectosome data corresponding with the communication terminal 40 of the transmission source as priority notification frame, sequentially In the case of along the 1st pointer to up to this router 60, the result of determination of step SC100 is "Yes".Further, routing engine portion 620 in the case of the result of determination of step SC100 is "Yes", writes in the payload portion corresponding to above-mentioned priority notification frame The priority shown in priority data that enters and the packet that changes this device forwards the priority level initializing (step in controlling SC110), and, each switch hub 50 in said communication paths sends (clean culture transmission) and sets change instruction frame (SC120).

It is above the structure of router 60.

＜ A-2: action ＞

Below, it is respectively provided with 8 COM1s with router 60 and switch hub 50, and such as Fig. 9 institute in LAN1A In case of showing and being connected with each other, the action of present embodiment is described.In fig .9, represent COM1 with the circle of blacking, The port numbering of this COM1 is represented by the numeral of band #.As it is shown in figure 9, the COM1 of port numbering=1 of router 60A It is connected with switch hub 50A, if observed from switch hub 50A, then router 60A and switch hub 50A Port numbering=2 COM1 connect.As it is shown in figure 9, the COM1 of port numbering=3 of switch hub 50A with Communication terminal 40A connects, and the COM1 of port numbering=4 is connected with switch hub 50B.If from switch hub 50B observes, then switch hub 50A is connected with the COM1 of port numbering=5 of switch hub 50B, switch type collection The COM1 of port numbering=6 of line device 50B is connected with communication terminal 40B, the COM1 of its port numbering=7 and the end that communicates End 40C connects.It addition, the start time of the action of explanation below, router 60 and the neighbouring device of switch hub 50 The linking objective identifier of table empties as NULL.

The routing engine portion 620 of router 60A, after the power supply (omitting diagram) of router 60A is connected, have passed through rule The moment T0 of T of fixing time carries out multicast and transmits claim frame.So, from the router 60A claim frame that sends out of multicast first by Switch hub 50A receives.The switching engine portion 520 of switch hub 50A connects via the COM1 of port numbering=2 Receive above-mentioned claim frame, perform each process of step SB150 of Fig. 6, SB160, SB180 and SB190.Owing to receiving frame for request Frame, therefore, the result of determination of step SB100 is "No", and the result of determination of SB120 and SB170 is "Yes".

Owing to performing the process of step SB150, therefore, it is associated with port numbering=2 and is stored in switch hub Linking objective identifier in the neighbouring device table of 50A is rewritten as forwarding source identifier (that is, the route given in receiving frame The MAC Address of device 60).It addition, the source identifier that forwards of this reception frame is rewritten as switch type line concentration by the process of step SB160 The MAC Address of device 50A.In step SB180, for depositing of the neighbouring device table after being updated by the process of step SB150 Store up the neighbouring device notification frame after content writes as neighbouring device information, enter to router 60 from switch hub 50A Row clean culture transmission.Further, in step SB190, perform to have been carried out by the process of step SB160 forwarding changing of source identifier Flooding of claim frame after writing.As noted above, its reason is, the transmission destination-mac address of claim frame is multicast address.This Sample, the claim frame flooded is received respectively by communication terminal 40A and switch hub 50B.

If the control portion 410 of communication terminal 40A receives claim frame via communication I/F portion 420, then perform above-mentioned excellent First level notifier processes (with reference to Fig. 3).If illustrated in greater detail, then control portion 410 is by the payload portion of above-mentioned claim frame The forwarding source identifier (that is, the MAC Address of switch hub 50A) of write writes to volatibility as neighbouring device information In storage part 444 (Fig. 3: step SA100).Then, control portion 410 generates by the transmission source MAC Address of above-mentioned claim frame (i.e., The MAC Address of router 60A) be set to send destination-mac address priority notification frame, send this priority notification frame (Fig. 3: Step SA110).Using the MAC Address of communication terminal 40A as forward source identifier and write to this priority notification frame effective In load portion, and also it is written with priority data and the neighbouring device information of communication terminal 40A.

If the switching engine portion 520 of switch hub 50B receives forwards, from switch hub 50A, the request of coming Frame, then with the switching engine portion 520 of switch hub 50A identically, perform step SB150 of Fig. 6, SB160, SB180 and Each process of SB190.If illustrated in greater detail, then adjacent at this device of the switching engine portion 520 of switch hub 50B In equipment list, it is rewritten as the linking objective identifier corresponding with port numbering=5 forwarding that comes to ask from switch hub 50A Seek the forwarding source identifier (that is, the MAC Address of switch hub 50A) given in frame, revised adjacent set for by this The storage content of standby table, as the neighbouring device notification frame after the write of neighbouring device information list, carries out clean culture biography to router 60 Send.On this basis, the switching engine portion 520 of switch hub 50B carries out forwarding source identifier is rewritten as switch type collection Flooding of claim frame after the MAC Address of line device 50B.

As it has been described above, the claim frame flooded is received by communication terminal 40B and 40C respectively.Communication terminal 40B(or Communication terminal 40C) control portion 410 with the opportunity that is received as of this claim frame, perform control portion 410 phase with communication terminal 40A Same priority notification processes (with reference to Fig. 3).Its result, using the MAC Address of switch hub 50B as neighbouring device information And write to communication terminal 40B(or 40C) volatile storage portion 444 in, to router 60 loopback by this neighbouring device information, Communication terminal 40B(or 40C) the priority notification frame that is written in payload portion of priority data.As indicated above The execution result of action, the storage content of the neighbouring device table of switch hub 50A and 50B and communication terminal 40A, 40B And the neighbouring device information of 40C becomes the state shown in Figure 10.

Below, the renewal forwarding the neighbouring device table controlled and carry out along with notification frame is described.If switch type collection The switching engine portion 520 of line device 50B is via port numbering=6(or 7) COM1 receive from communication terminal 40B(or communication Terminal 40C) the priority notification frame that transmits to router 60 clean culture, then perform step SB150 of Fig. 6, SB160 and SB190 Process.Being priority notification frame owing to receiving frame, therefore, the result of determination of step SB100 and SB170 is "No", step SB120 Result of determination be "Yes".

Owing to performing the process of step SB150, therefore with the port-mark of the COM1 receiving priority notification frame The linking objective identifier that symbol is associated and is stored in the neighbouring device table of switch hub 50B, is rewritten as receiving frame The MAC Address of the forwarding source identifier (that is, communication terminal 40B(or communication terminal 40C) of middle imparting), the forwarding source of this reception frame Identifier is rewritten as the MAC Address of switch hub 50B by the process of step SB160.Further, in step SB190, will The priority notification frame communication via port numbering=5 of the rewriting forwarding source identifier has been carried out by the process of step SB160 Port is sent.

If the switching engine portion 520 of switch hub 50A receives the priority notification sent from communication terminal 40A Frame or from switch hub 50B forward come notification frame (that is, switch hub 50B send neighbouring device notification frame, Or the priority notification frame forwarded by switch hub 50B), the most in the same manner, perform step SB150 of Fig. 6, SB160 and The process of SB190.Switch hub 50A is by the linking objective identifier corresponding with the COM1 receiving above-mentioned notification frame The forwarding source identifier being rewritten as in this notification frame giving (if the notification frame forwarded by switch hub 50B, is then to be somebody's turn to do The MAC Address of switch hub 50B, if the priority notification frame sent from communication terminal 40A, is then this communication terminal The MAC Address of 40A), the source identifier that forwards of this notification frame is forwarded to router 60 after being rewritten as the MAC Address of this device. If router 60 receives the notification frame forwarded from switch hub 50A via the COM1 of port numbering=1, then exist The linking objective identifier corresponding with this port numbering is rewritten as the forwarding source mark of this frame by the neighbouring device table of this device Symbol.As the execution result of action indicated above, router 60, switch hub 50A and 50B respective neighbouring device table Storage content be updated to the state shown in Figure 11 from the state shown in Figure 10.It is clear that with reference to Figure 11, above-mentioned neighbouring device Represent the network topology in LAN1A to the storage content of table and the neighbouring device information noncontradictory of each communication terminal 40.

Here, the point that should pay close attention to is, in action described above, router 60A from switch hub 50A and In the neighbouring device notification frame that 50B receives, the neighbouring device information list of write, is not correspond to the neighbouring device shown in Figure 11 The storage content of table, and correspond to the storage content of the neighbouring device table shown in Figure 10.At each neighbouring device shown in Figure 10 In the storage content of table, the annexation of router 60A and switch hub 50A is only shown to noncontradictory.Therefore, receiving To the moment for the notification frame carrying out the claim frame that multicast transmits at moment T0, routing engine portion 620 generates and only represents route The topological data of the annexation of device 60A and switch hub 50A.

Further, if from moment T0 again through stipulated time T, then claim frame is carried out multicast transmission by routing engine portion 620, Switch hub 50A and 50B performs process same as described above respectively.As at moment T0+T from router 60A The response of the claim frame sent out and by each neighbouring device notification frame of switch hub 50A and 50B loopback, be written with The neighbouring device information list corresponding with the storage content of the neighbouring device table shown in Figure 11.Therefore, receive for The claim frame that moment T0+T multicast transmits (if i.e., transmitted the multicast of moment T0 as the 1st time, is then that the multicast of the 2nd time passes Send) and the moment of the neighbouring device notification frame of loopback, routing engine portion 620 generates and represents that this device is whole with what this device had under its command The topological data of the annexation of communicator.The running management personnel of LAN1A by browsing the topological data of above-mentioned generation, from And will appreciate that the network topology of LAN1A.

The routing engine portion 620 of router 60A is receiving respectively from communication terminal 40A, 40B and 40C loopback every time During priority notification frame, perform above-mentioned priority level initializing control and process (with reference to Fig. 8).As noted above, set in this priority Determining in control process, can routing engine portion 620 judge determine this device and this priority notification frame with reference to topological data Communication path (step SC100) between transmission source.As noted above, carry out what multicast transmitted receiving at moment T0 In the moment of the notification frame of claim frame and loopback, only generate the annexation only representing router 60A and switch hub 50A Topological data (that is, corresponding with router 60A tectosome data and the tectosome data corresponding with switch hub 50A). So, carry out claim frame that multicast transmits and moment of priority notification frame of loopback receiving at moment T0, do not give birth to Becoming tectosome data corresponding with communication terminal 40A, 40B and 40C respectively, the result of determination of step SC100 is "No".That is, exist Receive and carry out claim frame that multicast transmits and moment of priority notification frame of loopback at moment T0, do not perform step SC110 and later process thereof.

Corresponding thereto, the priority notification frame of loopback for the claim frame transmitted in moment T0+T multicast is being received Moment, as noted above, generate respectively with router 60A, switch hub 50A, 50B, communication terminal 40A, 40B and 40C Corresponding tectosome data.It is thus possible, for instance receiving in the case of the priority notification frame that communication terminal 40B sends, road Determined this communication terminal 40B's by engine part 620 with reference to the 1st pointer of the tectosome data corresponding with this communication terminal 40B Linking objective is switch hub 50B, and the 2nd pointer with reference to the tectosome data corresponding with switch hub 50B determines Go out this communication terminal 40B to be connected with the COM1 of port numbering=6 of switch hub 50B.It addition, routing engine portion 620 The 1st pointer with reference to the tectosome data corresponding with switch hub 50B determines this switch hub 50B and switch type Hub 50A connects, and the 2nd pointer with reference to the tectosome data corresponding with switch hub 50A determines switch type line concentration Device 50B is connected with the COM1 of port numbering=4 of switch hub 50A.Further, routing engine portion 620 with reference to exchange 1st pointer of tectosome data corresponding for formula hub 50A determines that this switch hub 50A is connected with this device, reference 2nd pointer of the tectosome data corresponding with this device determines the COM1 of switch hub 50A and port numbering=1 Connect.Thus, the communication path between router 60A and communication terminal 40B is determined.

It is as noted previously, as the communication path determined between this device and communication terminal 40B, therefore, step SC100 Result of determination is "Yes", performs step SC110 and later process thereof.As noted above, excellent send from communication terminal 40B First level notification frame is written with the priority data representing that priority is " 1 ".Therefore, in step SC110, carry out packet and turn Send out the priority level initializing controlled, so that as long as no from carrying out leading to of data communication that priority be " 0 " (limit priority) The packet that letter terminal (in the present embodiment, for communication terminal 40A) sends, the most most preferably will send out from communication terminal 40B The packet sent is sent to IP network, it addition, in the situation of the packet received via IP network with communication terminal 40B as target Under, as long as no carrying out the communication terminal of the data communication that priority is " 0 " as sending the packet of target, then override This packet is sent by ground to switch hub 50A.Further, in step SC120, to from router 60A to communication terminal Each switch hub 50(on the communication path of 40B i.e., switch hub 50A and 50B) send set change instruction frame, This setting change instruction frame is written with setting change instruction data, sets change instruction data and illustrate that connection has this communication terminal The COM1 of 40B and the priority of the data communication carried out via this COM1 is set to " 1 ".Specifically, to exchange Formula hub 50A sends and sets change instruction frame, is written with setting change and refers in the payload portion of this setting change instruction frame Registration evidence, sets change instruction data and illustrates port numbering=4 and the data carried out via the COM1 of this port numbering led to The priority of letter is set to " 1 ".On the other hand, setting change instruction frame, this setting change instruction are sent to switch hub 50B The payload portion of frame is written with setting change instruction data, sets change instruction data and port numbering=6 and will be via are shown The priority of the data communication that the COM1 of this port numbering is carried out is set to " 1 ".

If the switching engine portion 520 of switch hub 50A or 50B receives the setting change sent from router 60 Instruction frame (step SB100 of Fig. 6: yes), then according to the setting change of write in the payload portion of this setting change instruction frame The content shown in data is indicated to change frame and forward the setting (step SB110 of Fig. 6) of priority when controlling.Above-mentioned setting becomes More indicate in the payload portion of frame write sets the priority shown in change instruction data as " 1 ", therefore, and switching engine portion 520 only carry out the setting change of QoS for the COM1 shown in these setting change instruction data.Specifically, setting QoS Surely it is changed to, as long as no the frame received via the COM1 that priority is " 0 " (or to the communication ends that priority is " 0 " The frame sent of mouth), the frame that the most most preferably performs to receive via the COM1 shown in these setting change instruction data (or to The frame that this COM1 is sent) forwarding.

Corresponding thereto, if routing engine portion 620 receives the priority notification frame sent from communication terminal 40A, then will Set change instruction frame to send to switch hub 50A, wherein, this setting change instruction frame is written with setting change instruction Data, set change instruction data and illustrate port numbering=3 and the data communication that will carry out via the COM1 of this port numbering Priority be set to " 0 ".If the switching engine portion 520 of switch hub 50A receives this setting change instruction frame, then press The setting of priority when controlling is forwarded according to following manner change frame.That is, due to the payload of above-mentioned setting change instruction frame In portion, write sets the priority shown in change instruction data as " 0 ", therefore, by VLAN setting by this setting change instruction The network segment of the COM1 shown in data separates with the network segment of other COM1s, and carries out the setting change of QoS.Concrete next Say, the setting of QoS is changed to, the frame that most preferably performs to receive via this COM1 (or send to this COM1 Frame) forwarding.The result carrying out above-mentioned VLAN setting is, as shown in phantom in Figure 12, in LAN1A, by only communication terminal The network segment belonging to 40A separates virtually with the network segment belonging to switch hub 50B, communication terminal 40B and 40C, it is possible to It is reliably prevented hindering of the data communication that performed by communication terminal 40B or 40C of audio communication that communication terminal 40A performs.

As described above, in the present embodiment, if the network having under its command for router 60 in advance housed Communication terminal 40 and set the priority of the data communication that this communication terminal 40 is carried out, the frame in the most each switch hub 50 The priority level initializing controlled is forwarded automatically to change.In the present embodiment, due to for switch hub 50, it is not necessary to will The MAC Address of communication terminal 40 carrying out the transmission/reception of voice data is associated with the setting content etc. of QoS and deposits in advance Storage, therefore, alleviates the fussy degree setting operation of running management personnel.That is, according to present embodiment, it is possible to alleviate setting and make The fussy degree of industry to make each switch hub 50 carry out relative with the priority of the data communication performed by each communication terminal The forwarding answered controls.Additionally, in action example discussed above, the two priority classes in LAN1A is illustrated, but right Two priority classes in LAN1B is also identical.

It addition, according to present embodiment, by browsing based on from switch hub 50 and the phase of communication terminal 40 loopback Adjacent facility information and the topological data that generates, thus also be able to easily grasp the network of network topology that router 60 has under its command. Here, connected with this switch hub 50 from the size of data of the neighbouring device information of each switch hub 50 transmission Depending on the quantity of relay, can't be more than or equal to corresponding with the COM1 quantity that this switch hub 50 is had Size of data.That is, for the size of data in payload portion of the notification frame in present embodiment, even if LAN1A is comprised Switch hub 50 quantity increase, also will not with this increase and unrestrictedly increase.Therefore, though the big rule of LAN1A Modelling, also will not apply the load of excess because determining network topology to LAN1A.

Further, the router 60 of present embodiment often periodically makes requests on the multicast biography of frame through stipulated time T Send, therefore, even if having carried out newly connecting switch hub 50(or communication terminal 40) change of such network topology, It also is able to the multicast transmission of the claim frame by start to count from the connection of new switch hub the 2nd time, and generates nothing Contradiction and the topological data of the network topology after correctly representing this change.That is, according to present embodiment, it is possible to avoid to LAN1A applies the load of excess, and can detect the change of network topology without delay.

＜ the B: the 2 embodiment ＞

Figure 13 is the block diagram of the structure example of the LAN1C of the 2nd embodiment representing the present invention.

If contrast Figure 13 and Fig. 1, being then clear that, the difference of LAN1C with LAN1A is, replaces switch type line concentration Device 50B and there is switch hub 500.Switch hub 500 is existing switch hub, with switch hub The difference of 50 is, only performs the frame sending destination-mac address based on the frame received and forwards control (that is, the step of Fig. 6 The process of SB190).

In LAN1C, it is forwarded to the claim frame of switch hub 500 from switch hub 50A, does not rewrite forwarding Source identifier is just forwarded to communication terminal 40B and 40C.Therefore, make in the volatile storage portion 444 of communication terminal 40B and 40C It is written with the MAC Address of switch hub 50A for neighbouring device information.In the same manner, respectively from communication terminal 40B and 40C The priority notification frame sent, does not the most rewrite forwarding source identifier and is just forwarded to switch type line concentration by switch hub 500 Device 50A.Therefore, in the neighbouring device table of switch hub 50A, the COM1 being connected with switch hub 500 Port identifiers be associated and be written with some of the MAC Address of communication terminal 40B and the MAC Address of communication terminal 40C. Its reason is, respectively from communication terminal 40B and 40C send priority notification frame, the forwarding source of the side first received Identifier by after the forwarding source identifier of the opposing party that receives rewrite.

The result carried out MAC Address writes to neighbouring device table according to main points discussed above is, router 60A is raw Become to represent the topological data of the network topology shown in Figure 14 (A) or Figure 14 (B).Figure 14 (A) be respectively from communication terminal 40B and In the priority notification frame that 40C sends, the topological data institute generated in the case of switch hub 50A first receives the latter The network topology represented, Figure 14 (B) is illustrated that generate in the case of switch hub 50A first receives the former opens up Flutter the network topology represented by data.If Figure 14 (A) or Figure 14 (B) is contrasted with Figure 13, then it is clear that, Figure 14 (A) or there is not switch hub 500 in the network topology shown in Figure 14 (B), it addition, the network of the reality with LAN1C The difference of topology is, only has the one party in communication terminal 40B and 40C.

As it has been described above, in the case of including existing switch hub in the network that router 60 has under its command, it is impossible to Grasp this existing switch hub and other devices (that is, router 60 or switch hub 50, communication terminal 40) Annexation, in the priority relevant to the data communication that the communication terminal being connected on existing switch hub is carried out Control is likely to produce obstacle.Such as, in the case of generating the topological data representing the network topology shown in Figure 14 (A), Two priority classes cannot be carried out for the data communication that communication terminal 40C is carried out, otherwise, represent shown in Figure 14 (B) generating Network topology topological data in the case of, it is impossible to the data communication carried out for communication terminal 40B carries out priority control System.But, in LAN1C, it is possible to grasp router 60 and the general annexation of switch hub 50, for exchange The communication terminal 40 that formula hub 50 connects carries out two priority classes.

If the switch hub that the network that router 60 has under its command is comprised is entirely existing switch hub, then Certainly cannot grasp the network topology in this network or carry out the two priority classes for each data communication.But, if road Including at least 1 switch type line concentration involved in the present invention in multiple switch hubs that the network being had under its command by device 60 is comprised Device 50, then can be grasped the router 60 annexation with this switch hub 50 (that is, except generally by running management personnel Existing switch hub outside the network topology of outline), it addition, can be for being connected with this switch hub 50 Data communication that communication terminal 40 is carried out and execution priority controls.

＜ C: deformation ＞

Above, embodiments of the present invention are illustrated, but it is of course possible to this embodiment are carried out following deformation.

(1) router 60 in the respective embodiments described above, is made periodically to multicast transmission with specific time interval for asking Seek the claim frame sending notification frame but it also may be received as opportunity with the packet of predetermined regulation kind, and make road By device 60, claim frame is carried out multicast to transmit.Such as, it is received as opportunity with ARP packet, makes router 60 send claim frame. New this situation of ARP packet that sends represents and is connected to new communication terminal 40 in the network that router 60 has under its command, with new The connection of communication terminal, network topology may have occurred change, furthermore, it may be desired to change frame forwards the priority controlled.As Fruit makes router 60 send claim frame with new being received as opportunity of ARP packet, then without waiting for through the stipulated time be The change of the network topology that can detect the connection with new communication terminal and cause, and, it is not necessary to wait for above-mentioned regulation Time can carry out frame and forward the change of the priority level initializing controlled.

Additionally, in the case of router 60 has the effect of Dynamic Host Configuration Protocol server concurrently, it is possible to connect from the communication terminal having under its command Receiving for asking the packet distributing IP address is opportunity, and claim frame carries out multicast and transmits.Further, router 60 is made Perform claim frame periodically carries out process and the connecing with particular kind of packet that multicast transmits with specific time interval Receive in the case of claim frame being carried out the process that multicast transmits for opportunity, it is also possible to will when the multicast carrying out the latter transmits every time This moment remeasures whether have passed through the above-mentioned stipulated time as Fixed Initial Point.Also it is in the same manner for control frame, Ke Yi On the basis of periodically multicast transmits (or replace periodically multicast transmission), with ARP packet or be used for asking to distribute IP The packet of the predetermined regulation kind such as the packet of address be received as opportunity, and make router 60 carry out multicast and pass Send.

(2) in the respective embodiments described above, switch hub 50 is made to send adjacent setting with the opportunity that is received as of claim frame Standby notification frame, but also be able to periodically make switch hub 50 send neighbouring device notification frame with specific time interval.Right Communication terminal 40 can also be periodically made to be transmitted in the same manner with specific time interval in priority notification frame.In as above institute State in the mode periodically sending notification frame, it is not necessary to make router 60 that claim frame to carry out multicast and transmit, as long as from route Device 60 carries out giving forwarding source identifier in the predetermined part in the frame that multicast transmits to the network having under its command and carries out Multicast transmits.

(3) in above-mentioned each embodiment, when receiving claim frame every time, the loopback of each switch hub 50 is made The neighbouring device notification frame of neighbouring device information list it is written with in payload portion.But, from N(natural number) and secondary In the period received to the reception of the claim frame of the N+1 time of claim frame, the storage content of neighbouring device table is not changed in In the case of, when responding for this claim frame received for the N+1 time, it is also possible to phase will be replaced in payload portion Adjacent facility information list and being written with represents that the notification frame of the data that neighbouring device information list is not changed in this situation is carried out Loopback.

(4) in above-mentioned each embodiment, predefine this communication terminal 40 for each communication terminal 40 and carried out The kind of data communication, and would indicate that the priority data of the priority of this data communication is previously written to non-volatile memories In portion 442.However, it is possible to so that each communication terminal 40 can carry out polytype data communication, and would indicate that executory The priority data of the priority of data communication writes to non-volatile memories portion 442.Above-mentioned situation can be according to following Main points realize.That is, make each communication terminal 40 store multiple signal procedure, and prestore in each communication terminal 40 for by State the priority list that each signal procedure is associated with the priority of the data communication carried out according to this signal procedure.Further, to refer to Show that certain signal procedure of execution is opportunity, determine with reference to the storage content of above-mentioned priority list corresponding with this signal procedure preferential Level, the priority data of this priority writes the process to non-volatile memories portion 442 to make control portion 410 perform would indicate that.

(5) in above-mentioned each embodiment, the feature showing router of the present invention significantly is achieved by software Multicast transmission process and priority level initializing control process.But, it is of course possible to make the multicast unit that realization multicast transmission processes And the priority level initializing control unit that execution priority setup control processes is realized by hardware such as electronic circuits respectively.For exchange Formula hub 50 is also in the same manner, can realize frame by hardware such as electronic circuits and forward control process, neighbouring device notification frame Transmission process and priority level initializing change process these and process.

(6) in above-mentioned each embodiment, the priority of urgent audio communication is set to the highest, common sound is led to The priority of letter is set to second highest, is set to minimum by the priority of the data communication outside audio communication.But, such as if counting According to the Large Copacity such as uploading the every day carried out to database server and needing the data communication carried out at high speed, even then sound Priority is also preferably set to height by data communication outside communication certainly.It addition, in the above-described embodiment, with COM1 it is Unit has carried out priority level initializing, but also is able to (that is, Yi Getong in units of the communication terminal of the end being positioned at communication path The MAC Address of letter terminal is unit) carry out priority level initializing.In the above case said, use as setting change instruction data The MAC Address of the transmission source communication terminal of priority data and this priority data, can make switch hub 50 according to this Set change instruction data execution priority and set change process.

The application is based on Japanese patent application (Patent 2011-066591) filed in 24 days March in 2011, here, makees Its content is quoted for reference

The explanation of label

1A, 1B, 1C ... LAN, 40A, 40B, 40C, 40D, 40E, 40F ... communication terminal, 50A, 50B, 50C, 500 ... exchange Formula hub, 60 ... router, 410 ... control portion, 420,510,610 ... communication I/F portion, 430 ... user I/F portion, 520 ... hand over Change engine part, 440,530,630 ... storage part, 442 ... non-volatile memories portion, 444 ... volatile storage portion, 620 ... route Engine part, 450 ... bus.

Claims (8)

1. a communication system, in this communication system, comprises as communicator: router, and it is for the network that will have under its command It is connected with other networks；One or more switch hubs, it is included in the network that described router has under its command；And 1 or Multiple communication terminals, it is connected with some of one or more switch hubs described respectively,

This communication system is characterised by,

Described router has:

Multicast unit, it gives the mailing address of described router as forwarding source identifier in claim frame, and this is asked Asking frame to carry out multicast to described network to transmit, wherein, this claim frame is used for, and asks respectively to one or more communication terminals described The priority data and the expression that send the priority of the data communication that this communication terminal of expression is carried out are carried out to this communication terminal The neighbouring device information of the communicator that frame forwards, asks to send this friendship to one or more switch hubs described respectively Change the neighbouring device information of formula hub；And

Priority level initializing control unit, it receives at least 1 communication terminal from one or more communication terminals described in order to logical Know the described priority of this communication terminal and neighbouring device information and the priority notification frame of loopback and from described 1 or many At least 1 switch hub in individual switch hub returns to notify the neighbouring device information of this switch hub The neighbouring device notification frame sent, determines from described router to the communication of described at least 1 communication terminal for each communication terminal Switch hub on path, the switch hub transmission on each communication path is positioned at the end of this communication path The priority data of communication terminal and the information of this communication path of expression, send corresponding to the priority shown in this priority data And carry out the instruction forwarding control of the frame sending along this communication path/receiving,

Described at least 1 switch hub has:

Neighbouring device table, its storage represents the phase having carried out the communicator that frame forwards to described at least 1 switch hub Adjacent facility information；

Frame forwards control unit, and it gives in the frame that described at least 1 switch hub receives forwarding source identifier In the case of, after this forwarding source identifier is write to described neighbouring device table as neighbouring device information, by this forwarding Source identifier be rewritten as described in the mailing address of at least 1 switch hub and forward corresponding to the transmission target of this frame Control；

Neighbouring device notification unit, it is in the case of the frame received is described claim frame, generates and is written with described adjacent The neighbouring device notification frame of the neighbouring device information of storage in equipment list, by described at least 1 switch hub communicatedly Location gives and carries out loopback for forwarding source identifier；And

Priority level initializing changing unit, the forwarding control mode of the frame at least 1 switch hub described in its switching, so that The forwarding of the frame that must be transmitted/receive along the communication path shown in the information received from described router controls, be according to The priority shown in priority data that receives together with this information and carry out,

Described at least 1 communication terminal has:

Neighbouring device information memory cell, it is received as opportunity with described claim frame, the forwarding that will be given in this claim frame Source identifier stores as the neighbouring device information of described at least 1 communication terminal；And

Priority notification unit, it is being written with described in expression the priority of the data communication that at least 1 communication terminal is carried out Priority data and described at least 1 communication terminal neighbouring device information described priority notification frame in, as turn Rise identifier and the mailing address of at least 1 communication terminal described in giving, and carry out loopback.

Communication system the most according to claim 1, it is characterised in that

Described priority level initializing changing unit, corresponding to the priority data received from described router, switches QoS (Quality of Service) sets and sets with at least one in VLAN (Virtual Local Area Network) setting Fixed.

Communication system the most according to claim 1 and 2, it is characterised in that

Described priority level initializing changing unit is receiving the communication lines shown in the information that will be located in receiving from described router In the case of the communication terminal of the end in footpath is as the frame of transmission source, rewrite the head of this packet, so that write is to being somebody's turn to do The packet in the 3rd layer of OSI Reference Model of the packet in the payload portion of frame forwards and controls, and corresponds to this excellent First priority shown in DBMS and carry out.

4. a router, its for will comprise one or more switch hubs and respectively with one or more switch types described One or more communication terminals that some of hub connects have network under its command at interior, are connected with other networks,

This router is characterised by having:

Multicast unit, it gives the mailing address of described router as forwarding source identifier in claim frame, and this is asked Asking frame to carry out multicast to described network to transmit, wherein, this claim frame is used for, to one or more switch hubs described respectively Request sends and represents and carried out, to this switch hub, the neighbouring device information of communicator that frame forwards, to described 1 or Multiple communication terminals ask respectively to send the priority of data communication representing that this communication terminal carried out priority data and The neighbouring device information of this communication terminal；And

Priority level initializing control unit, it receives at least 1 communication terminal from one or more communication terminals described in order to logical Know the described priority of this communication terminal and neighbouring device information and the priority notification frame of loopback and from described 1 or many At least 1 switch hub in individual switch hub returns to notify the neighbouring device information of this switch hub The neighbouring device notification frame sent, determines from described router to the communication of described at least 1 communication terminal for each communication terminal Switch hub on path, the switch hub transmission on each communication path is positioned at the end of this communication path The priority data of communication terminal and the information of this communication path of expression, send corresponding to the priority shown in this priority data And carry out the instruction forwarding control of the frame sending along this communication path/receiving.

5. a switch hub, it is connected with one or more communication terminals, is included in the network that router has under its command,

This switch hub is characterised by having:

Neighbouring device table, it has carried out the neighbouring device information of the communicator that frame forwards to representing to described switch hub Store；

Frame forwards control unit, and it gives in the case of having forwarding source identifier in the frame received, and is being marked in this forwarding source After knowledge symbol writes to described neighbouring device table as neighbouring device information, this forwarding source identifier is rewritten as described switch type The mailing address of hub and transmission target corresponding to this frame carries out forwarding control；

Neighbouring device notification unit, it is to ask transmission expression to forwarded frame to this switch hub at the frame received Communicator neighbouring device information and in the case of the claim frame that described router sends, generate be written with in described phase In adjacent equipment list, the neighbouring device notification frame of the neighbouring device information of storage, gives the mailing address of described switch hub Loopback is carried out for forwarding source identifier；And

Priority level initializing changing unit, it switches the forwarding control mode of the frame in this switch hub, so that edge is from institute State the frame that the communication path shown in the information that router receives is transmitted/receives forwarding control, be according to this information The priority shown in priority data that receives together and carry out.

6. a communication means, it is in the router, this router will comprise one or more switch hubs and respectively with One or more communication terminals that some of one or more switch hubs described connects have network under its command at interior, with other Network connects,

This communication means is characterised by,

As forwarding source identifier to give the mailing address of described router in claim frame, and by this claim frame to described net Network carries out multicast and transmits, and wherein, this claim frame is used for, and asks respectively to send to one or more switch hubs described to represent The neighbouring device information of the communicator that frame forwards has been carried out, to one or more communication terminals described to this switch hub Ask the priority data sending the priority of the data communication that this communication terminal of expression is carried out and this communication terminal respectively Neighbouring device information,

Receive at least 1 communication terminal from one or more communication terminals described to notify the described excellent of this communication terminal First level and neighbouring device information and the priority notification frame of loopback and from one or more switch hubs at least 1 Switch hub is in order to notify the neighbouring device information of this switch hub and the neighbouring device notification frame of loopback, for respectively Communication terminal determine from this router to the communication path of described at least 1 communication terminal switch hub, Xiang Getong Switch hub on letter path sends priority data and the expression of the communication terminal of the end being positioned at this communication path The information of this communication path, sends and carries out sending along this communication path/connecing corresponding to the priority shown in this priority data The instruction forwarding control of the frame received.

7. a communication means, it is in switch hub, and this switch hub is with one or more communication terminals even Connect, be included in the network that router has under its command,

This communication means is characterised by,

The frame received gives in the case of having forwarding source identifier, this forwarding source identifier is being believed as neighbouring device This forwarding source identifier to after in neighbouring device table, is rewritten as the mailing address of described switch hub and corresponding by breath write Transmission target in this frame carries out forwarding control,

It is in order to the adjacent of communicator asking transmission expression to forwarded frame to this switch hub sets at the frame received For information in the case of the claim frame that described router sends, generate the phase being written with in described neighbouring device table storage The neighbouring device notification frame of adjacent facility information, gives the mailing address of described switch hub and entering for forwarding source identifier Row loopback,

Switch the forwarding control mode of frame in this switch hub, so that along the information institute received from described router The forwarding of the frame that the communication path shown is transmitted/receives controls, and is according to the priority data received together with this information Shown priority and carry out.

8. a communication means, it in this communication system, comprises as communicator: router in the communication system, its For the network having under its command is connected with other networks；One or more switch hubs, it is included in what described router had under its command In network；And one or more communication terminals, it is connected with some of one or more switch hubs described respectively,

This communication means is characterised by,

From described router, as forwarding source identifier to give the mailing address of described router in claim frame, and should Claim frame carries out multicast to described network and transmits, and wherein, this claim frame is used for, and respectively please to one or more communication terminals described Seek the priority data of the priority sending the data communication that this communication terminal of expression is carried out and represent to enter to this communication terminal The neighbouring device information of the communicator that frame of having gone forwards, asks to send to one or more switch hubs described to be somebody's turn to do respectively The neighbouring device information of switch hub,

The frame that at least 1 switch hub in one or more switch hubs described receives gives and has forwarding In the case of source identifier, after this forwarding source identifier is write to neighbouring device table as neighbouring device information, should Forward source identifier be rewritten as described in the mailing address of at least 1 switch hub and carry out corresponding to the transmission target of this frame Forward and control,

In the situation that the frame received by described at least 1 switch hub is the described claim frame sent from described router Under, generate the neighbouring device notification frame of the neighbouring device information being written with in described neighbouring device table storage, by described at least 1 The mailing address of individual switch hub gives and carries out loopback for forwarding source identifier to described router,

At least 1 communication terminal in one or more communication terminals described, with receive from described router send described in please Seeking frame is opportunity, forwards source identifier as the neighbouring device letter of described at least 1 communication terminal using give in this claim frame Breath stores,

It is being written with described in expression the priority data of priority of the data communication that at least 1 communication terminal is carried out and described In the priority notification frame of the neighbouring device information of at least 1 communication terminal, as forward source identifier and described in giving at least 1 The mailing address of individual communication terminal, and carry out loopback to described router,

Described router receives from the described priority notification frame of described at least 1 communication terminal loopback and from described at least 1 The described neighbouring device notification frame of individual switch hub loopback, for each communication terminal determine from described router to described to Switch hub on the communication path of few 1 communication terminal, the switch hub on each communication path sends and sets Change instruction frame, this setting change instruction frame comprise the communication terminal of the end being positioned at this communication path priority data and Represent the information of this communication path,

Receive the switch hub of described setting change instruction frame from described router, switch in this switch hub The forwarding control mode of frame, so that the frame being transmitted/receiving along the communication path shown in described setting change instruction frame Forward and control, be to carry out according to the priority shown in the priority data received.