CN103477594A - Communication system, router, switching hub, and communication method - Google Patents

Abstract

The purpose of the present invention is to make it possible to cause a switching hub to perform transfer control that corresponds to the priority level of data communication executed by each communication terminal, while reducing the laboriousness of setting operations. A control frame that sends a query about the priority level of data communication performed by each communication terminal is multicast to communication terminals included in a subordinate network from a router for connecting a network that includes a plurality of switching hubs to another network. Triggered by the reception of a respondent frame in which priority-level data that indicates the priority level is written, the router performs a process to provide an instruction indicating that the frame is to be transferred in a mode that corresponds to the priority level indicated by the priority-level data for each of the switching hubs on a communication pathway leading to the communication terminal from which the frame is to be sent. At the same time, each of the switching hubs is made to execute a process to switch the mode for controlling the transfer of the frame in accordance with an instruction provided by the router.

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 priority of the various data communication carried out of communication network control.

Background technology

In recent years, usually be built with following enterprise internal information system in enterprise etc., that is, and below LAN(is laid in each sites such as branch company, be called LAN in site), by LAN in these sites by router and the IP(Internet Protocol such as the Internet) net is connected.In above-mentioned site, LAN forms a plurality of switch hub cascade arrangements, the communication terminal that each user (for example, the practitioner of enterprise) uses and some connection the in these switch hubs.At this, so-called router refers to, according to OSI(Open System Interconnection) communication protocol of the 3rd layer (network layer) in reference model, carry out the relay that the forwarding of packet (the sending/receiving units of the data in the 3rd layer) is controlled.In addition, so-called switch hub refers to, according to the communication protocol of the 2nd layer (data link layer) in OSI Reference Model, carries out the relay of the forwarding control of frame (the sending/receiving units of the data in the 2nd layer), also referred to as the L2 switch.

Usually, in enterprise's internal information system, carry out according to VoIP(Voice Over Internet Protocol) sending/receiving of the voice data that carries out or according to HTTP(Hyper Text Transport Protocol) etc. various types of data communication such as sending/receiving of the text data that carries out.For example there is following situation, that is, in the teleconference carried out, carry out the sending/receiving of voice data according to VoIP between site, in the reading of enterprise's bulletin board or write fashionable sending/receiving of carrying out text data.As mentioned above, in the situation that various types of data communication can and carry out concurrently simultaneously, must be for all kinds predetermined priority of data communication, so that the high data communication of priority is not subject to the obstruction of the data communication that priority is low.The priority of the data communication that for example will carry out according to VoIP is made as higher than the priority of the data communication of carrying out according to HTTP, so that the latter does not counteract the former.If the former has been subject to the latter's obstruction, the sound of the speech that is representing each convention goer in teleconference can reappear etc. by spells, to being counteracted of meeting.

As all kinds predetermined priority for data communication so that an example of the technology that the high data communication of priority is not hindered by the low data communication of priority and enumerated QoS(Quality of Service).So-called QoS refers to, when each switch hub carries out the forwarding control of frame, to other frame, compares the forwarding of preferentially carrying out the frame that the data communication high with priority is relevant.In the situation of enterprise as above internal information system, each switch hub that in each site, the running management personnel of LAN must LAN comprises in for this site, grasped direct connection or indirectly (, via other switch hub) be connected with the communication terminal of the data communication of carrying out which kind of type after, suitably carry out this loaded down with trivial details operation of setting of QoS according to the relation between these data communication and priority.Therefore, proposed variously for alleviating the technology of the fussy degree relevant to the setting of QoS, as an example wherein, enumerated disclosed technology in patent documentation 1.In the disclosed technology of patent documentation 1, will carry out the MAC(Media Access Control of the communication terminal of audio data transmitting/reception) setting content of the QoS of address while controlling with the forwarding of frame carrying out this voice data is included is associated and pre-stored in each switch hub.And, take in the mac address table of this device and stored this MAC Address as opportunity, make each switch hub carry out the processing of using above-mentioned setting for the communication port corresponding with this MAC Address.

Patent documentation 1: TOHKEMY 2005-184192 communique

Summary of the invention

According to the disclosed technology of patent documentation 1, from the annexation without grasping in advance the communication terminal that carries out voice data communication and each switch hub, this puts, and can alleviate running management personnel's homework burden.But, in the disclosed technology of patent documentation 1, the whole switch hub comprised for LAN, the MAC Address that must carry out in advance the communication terminal that will carry out voice data communication is associated and stores this operation with the setting content of QoS, can not reduce fully running management personnel's homework burden.

The present invention is exactly In view of the foregoing and proposes, and its purpose is to provide a kind of can alleviate the fussy degree of setting operation, and makes the priority of each switch hub performed data communication corresponding to each communication terminal and forwards the technology of control.

For solving above-mentioned problem, a mode of the present invention provides a kind of communication system, in this communication system, as communicator, comprises: router, and it is connected with other networks for the network by having under its command, one or more switch hubs, it is included in the network that described router has under its command, and one or more communication terminals, it is connected with the some of described one or more switch hubs respectively, this communication system is characterised in that, described router has: the multicast unit, it gives the mailing address of described router in claim frame as forwarding source identifier, and this claim frame is carried out to the multicast transmission to described network, wherein, this claim frame is used for, to described one or more communication terminals, ask respectively transmission to mean the priority data and the neighbouring device information that means to have carried out to this communication terminal the communicator of frame forwarding of the priority of the data communication that this communication terminal carries out, ask respectively to send the neighbouring device information of this switch hub to described one or more switch hubs, and priority level initializing control unit, it receives at least 1 communication terminal from described one or more communication terminals for the described priority of notifying this communication terminal and neighbouring device information and the priority notification frame of loopback, and at least 1 switch hub from described one or more switch hubs for the neighbouring device information of notifying this switch hub the neighbouring device notification frame of loopback, switch hub determining from described router to the communication path of described at least 1 communication terminal for each communication terminal, to the switch hub on each communication path, send the end that is positioned at this communication path communication terminal priority data and mean the information of this communication path, send and carry out the indication of controlling along the forwarding of the frame of this communication path sending/receiving corresponding to the priority shown in this priority data, described at least 1 switch hub has: the neighbouring device table, its storage means to have carried out to described at least 1 switch hub the neighbouring device information of the communicator of frame forwarding, frame forwards control unit, it is in the situation that give the forwarding source identifier in the frame that described at least 1 switch hub receives, after in using this forwarding source identifier as neighbouring device information, writing to described neighbouring device table, this forwarding source identifier is rewritten as to the mailing address of described at least 1 switch hub and forwards control corresponding to the transmission target of this frame, the neighbouring device notification unit, it is in the situation that the frame received is the described request frame, generation writes the neighbouring device notification frame of the neighbouring device information of storing in described neighbouring device table, and the mailing address of described at least 1 switch hub is given as forwarding source identifier and carried out loopback, and priority level initializing change unit, the forwarding control mode of the frame in described at least 1 switch hub of its switching, so that carry out the forwarding of the frame of sending/receiving along the communication path shown in the information received from described router, control, according to the priority shown in the priority data received together with this information, carry out, described at least 1 communication terminal has: the neighbouring device information memory cell, it is with the opportunity that is received as of described request frame, the forwarding source identifier of giving in this claim frame is stored as the neighbouring device information of described at least 1 communication terminal, and priority notification unit, in the described priority notification frame of the neighbouring device information of its priority data in the priority that writes the data communication that means that described at least 1 communication terminal carries out and described at least 1 communication terminal, give the mailing address of described at least 1 communication terminal as forwarding source identifier, and carry out loopback.

In above-mentioned communication system, if the priority data of the priority of the data communication that this communication terminal of pre-stored expression carries out in each communication terminal, the setting of the priority in the frame of each switch hub the communication path from router to this communication terminal forwarding control can automatically be changed.Therefore, according to above-mentioned communication system, without to each switch hub, setting especially operation, can make the priority of each switch hub performed data communication corresponding to each communication terminal and forward control.

In addition, also can be configured to described priority level initializing change unit corresponding to the priority data received from described router, switching QoS(Quality of Service) set and VLAN(Virtual Local Area Network) at least one setting in setting.

In addition, also can be configured to described priority level initializing change unit in the situation that receive and will be positioned at the communication terminal of end of the communication path shown in the information received from described router as the frame of transmission source, rewrite the head of this packet, control so that write to the package forward in the 3rd layer of OSI Reference Model of the packet in the pay(useful) load section of this frame, carry out corresponding to the priority shown in this priority data.According to aforesaid way, can expect for the packet of sending to other networks from router, when controlling, the forwarding of the 3rd layer in these other networks preferentially processed.At this, as so that the mode that the priority when the forwarding of the 3rd layer is controlled uprises is rewritten the concrete example of the head of this packet, can enumerate the Point by DSCP(Diff Serv Code) value or CoS(Class of Service) value or TOS(Type Of Service) value is rewritten as the value of expression high priority.

In addition, for solving above-mentioned problem, another mode of the present invention provides a kind of router, its for will comprise one or more switch hubs and respectively with some one or more communication terminals that are connected of described one or more switch hubs at the interior network that has under its command, with other networks, be connected, this router is characterised in that, have: the multicast unit, it gives the mailing address of described router in claim frame as forwarding source identifier, and this claim frame is carried out to the multicast transmission to described network, wherein, this claim frame is used for, ask respectively to send the neighbouring device information that means to have carried out to this switch hub the communicator of frame forwarding to described one or more switch hubs, the priority data of the priority of the data communication of to described one or more communication terminals, asking respectively this communication terminal of transmission expression to carry out and the neighbouring device information of this communication terminal, and priority level initializing control unit, it receives at least 1 communication terminal from described one or more communication terminals for the described priority of notifying this communication terminal and neighbouring device information and the priority notification frame of loopback, and at least 1 switch hub from described one or more switch hubs for the neighbouring device information of notifying this switch hub the neighbouring device notification frame of loopback, switch hub determining from described router to the communication path of described at least 1 communication terminal for each communication terminal, to the switch hub on each communication path, send the end that is positioned at this communication path communication terminal priority data and mean the information of this communication path, send and carry out the indication of controlling along the forwarding of the frame of this communication path sending/receiving corresponding to the priority shown in this priority data.By router as above and described switch hub and described communication terminal are combined, thereby can form described communication system.

In addition, as another mode of the present invention, also consider that providing a kind of comprises the operation corresponding with described multicast unit and priority level initializing control unit at interior communication means.Installation by will comprise above-mentioned communication means, in common computer, makes the control part of this computer be moved according to this program, thereby can make this computer as router acts of the present invention.In addition, by described program is installed in common router, the route control part of this router is moved according to described program, thereby the function that shows significantly the feature of router of the present invention can be given in common router.In addition, concrete presentation mode as described program, can expect such as writing to CD-ROM(Compact Disk-Read Only Memory) or DVD(Digital Versatile Disc) etc. in the storage medium of embodied on computer readable and the mode of issue, or downloaded the mode of issuing by electrical communication lines such as the Internets.

In addition, for solving described problem, another mode of the present invention provides a kind of switch hub, it is connected with one or more communication terminals, be included in the network that router has under its command, this switch hub is characterised in that to have: the neighbouring device table, and it is to meaning that the neighbouring device information of having carried out the communicator of frame forwarding to described switch hub is stored; Frame forwards control unit, it is in the situation that given the forwarding source identifier in this received frame, after in using this forwarding source identifier as neighbouring device information, writing to described neighbouring device table, this forwarding source identifier is rewritten as to the mailing address of described switch hub and forwards control corresponding to the transmission target of this frame; The neighbouring device notification unit, it is in the situation that the frame received is to have forwarded the neighbouring device information of communicator of frame and the claim frame that sends from described router in order to ask send to mean to this switch hub, generation writes the neighbouring device notification frame of the neighbouring device information of storing in described neighbouring device table, and the mailing address of described switch hub is given as forwarding source identifier and carried out loopback; And priority level initializing change unit, it switches the forwarding control mode of the frame in this switch hub, control so that carry out the forwarding of the frame of sending/receiving along the communication path shown in the information received from described router, carry out according to the priority shown in the priority data received together with this information.Combined by the switch hub by above-mentioned and router and described communication terminal with described multicast unit and priority level initializing control unit, thereby can be formed described communication system.In addition, in another mode of the present invention, consider to provide forward the corresponding operation in control unit, neighbouring device notification unit and priority level initializing change unit at interior communication means a kind of comprising with memory cell, the frame of storage neighbouring device information.

In addition, for solving described problem, another mode of the present invention provides a kind of communication means, and it, comprises as communicator for communication system in this communication system: router, and it is connected with other networks for the network by having under its command; One or more switch hubs, it is included in the network that described router has under its command; and one or more communication terminals, it is connected with the some of described one or more switch hubs respectively, this communication means is characterised in that, from described router, give the mailing address of described router as forwarding source identifier in claim frame, and this claim frame is carried out to the multicast transmission to described network, wherein, this claim frame is used for, to described one or more communication terminals, ask respectively transmission to mean the priority data and the neighbouring device information that means to have carried out to this communication terminal the communicator of frame forwarding of the priority of the data communication that this communication terminal carries out, ask respectively to send the neighbouring device information of this switch hub to described one or more switch hubs, forward source identifier in the situation that give in the frame that at least 1 switch hub in described one or more switch hubs receives, after writing in the neighbouring device table using this forwarding source identifier as neighbouring device information, this forwarding source identifier is rewritten as to the mailing address of described at least 1 switch hub and forwards control corresponding to the transmission target of this frame, in the situation that the received frame of described at least 1 switch hub is the described request frame sent from described router, generation writes the neighbouring device notification frame of the neighbouring device information of storing in described neighbouring device table, the mailing address of described at least 1 switch hub is given as forwarding source identifier and carried out loopback to described router, at least 1 communication terminal in described one or more communication terminals, the described request frame received from described router transmission of take is opportunity, the forwarding source identifier of giving in this claim frame is stored as the neighbouring device information of described at least 1 communication terminal, in the priority notification frame of the neighbouring device information of the priority data of the priority that writes the data communication that means that described at least 1 communication terminal carries out and described at least 1 communication terminal, give the mailing address of described at least 1 communication terminal as forwarding source identifier, 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 the described neighbouring device notification frame of described at least 1 switch hub loopback, switch hub determining from described router to the communication path of described at least 1 communication terminal for each communication terminal, switch hub on each communication path sends setting change indication frame, the priority data of the communication terminal that this setting change indication frame comprises the end that is positioned at this communication path and the information of this communication path of expression, receive the switch hub of described setting change indication frame from described router, switch the forwarding control mode of the frame in this switch hub, so that carry out the forwarding control of the frame of sending/receiving along the communication path shown in described setting change indication frame, to carry out according to the priority shown in the priority data received.

The accompanying drawing explanation

Fig. 1 means the figure of structure example of enterprise's internal information system of the 1st execution mode of the present invention.

Fig. 2 means the figure of the structure example of the communication terminal 40 that the system of Fig. 1 comprises.

Fig. 3 means the flow chart of the flow process of the priority notifier processes that the control part 410 of communication terminal 40 is performed.

Fig. 4 means the figure of an example of the data configuration of the frame that carries out sending/receiving in the network that router 60 that the system at Fig. 1 comprises has under its command.

Fig. 5 means the figure of the structure example of the switch hub 50 that the system of Fig. 1 comprises.

Fig. 6 means the flow chart of the flow process of the processing that the switching engine section 520 of switch hub 50 carries out according to firmware.

Fig. 7 means the figure of the structure example of router 60.

Fig. 8 means the flow chart of the flow process of the priority level initializing control processing that the routing engine section 620 of router 60 carries out according to firmware.

Fig. 9 means the figure of an example of each annexation of installing in LAN1A.

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

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

Figure 12 is the figure of the effect for execution mode is described.

Figure 13 means the originally figure of the structure example of the LAN1C of the 2nd execution mode of the 1st invention.

Figure 14 is the figure of the network topology for the LAN1C grasped according to the topological data of router 60A generation is described.

Embodiment

Below, with reference to accompanying drawing, embodiments of the present invention are described.

<A: the 1st execution mode>

<A-1: structure>

Fig. 1 means the figure of structure example of the communication system of an embodiment of the invention.This communication system is described enterprise internal information system, and in the site that the sites such as the branch company in enterprise are laid, LAN is that LAN1A and LAN1B are connected to the IP network such as the Internet and form.As shown in Figure 1, LAN1A comprises router 60A, 2 switch hubs ( switch hub 50A and 50B), 3 communication terminals ( communication terminal 40A, 40B and 40C), and is connected to IP network via router 60A.As shown in Figure 1, be connected with switch hub 50A on router 60A, be connected with switch hub 50B and communication terminal 40A on switch hub 50A.And, be connected with communication terminal 40B and 40C on switch hub 50B.On the other hand, LAN1B comprises router 60B, switch hub 50C, 3 communication terminals (communication terminal 40D, 40E and 40F), and is connected to IP network via router 60B.As shown in Figure 1, be connected with switch hub 50C on router 60B, be connected with respectively communication terminal 40D, 40E and 40F on switch hub 50C.

6 communication terminals shown in Fig. 1 are for example personal computers, all have identical structure.Below, in the situation that needn't distinguish respectively this 6 communication terminals, be labeled as " communication terminal 40 ".3 switch hubs shown in Fig. 1 also have identical structure, in the situation that needn't distinguish respectively this 3 switch hubs, are labeled as " switch hub 50 ".In the same manner, the router 60A shown in Fig. 1 and 60B also have identical structure separately, in the situation that needn't distinguish respectively this 2 routers, are labeled as " router 60 ".

Communication terminal 40 (is connected to IP network via router 60 by the network had under its command with router 60, router 60 is made as to the network of default gateway, for router 60A, be LAN1A, for router 60B, be LAN1B) in the switch hub 50 that comprises connect, thereby be housed in this network.Be housed in communication terminal 40 in the network that router 60 has under its command the communicator with other (such as in being housed in LAN1A other communication terminal or be housed in other site the communication terminal in LAN or the www server be connected with IP network etc.) between carry out data communication.If illustrate in greater detail,, in 6 communication terminals shown in Fig. 1, communication terminal 40A, 40B, 40D and 40E carry out the VoIP terminal of the sending/receiving of voice data bag according to VoIP.At this, so-called voice data bag refers to, the voice data that means the sound of speaking of terminal user is carried out to compressed encoding and writes to the packet in pay(useful) load section.In these 4 VoIP terminals, communication terminal 40B and 40E be for the common audio communication such as teleconference, and communication terminal 40A and 40D are such as only for urgent audio communications such as fire circulars.In addition, communication terminal 40C and 40F are such as being to carry out the terminal of sending/receiving of the data except voice data such as sending/receiving of text data according to HTTP.

Switch hub 50 is data communication to be carried out the relay of relaying in the 2nd layer, and the transmission destination-mac address based on frame forwards control.Router 60 is data communication to be carried out the relay of relaying in the 3rd layer.Following situation for example,, the IP address of the communication terminal 40 of accommodating the network that if the transmission target ip address of the packet that router 60 receives from IP network is this router to be had under its command, by this packet to the forwarded had under its command, in the situation that this transmission target ip address is not the IP address of the communication terminal 40 in being housed in the network had under its command, according to the storage content of routing table, be forwarded to other routers.

As noted above, the LAN1A shown in Fig. 1 and LAN1B separately in, each communication terminal carries out common audio communication, urgent audio communication and these the 3 kinds of data communication of data communication except audio communication.The priority of these 3 kinds of data communication differs from one another.Specifically, be following situation, that is, the priority of the urgent audio communication that communication terminal 40A or 40D carry out is the highest, the priority of the audio communication that communication terminal 40B or 40E carry out is inferior high, and the priority of the data communication that communication terminal 40C or 40F carry out is minimum.Therefore, at LAN1A(or LAN1B) in, the frame that must carry out in each switch hub 50 forwards the setting of controlling, so that communication terminal 40A(or communication terminal 40D) the forwarding override ground of frame of sending/receiving carries out, communication terminal 40B(or communication terminal 40E) sending/receiving frame forwarding in proper order high priority carry out, the setting that the package forward in router 60 is controlled is also identical.

Current, for above-mentioned setting, normally by LAN1A(or LAN1B) the running management personnel with manual mode, carry out.Corresponding thereto, in the present embodiment, carry out respectively the processing of the feature that shows significantly present embodiment by making communication terminal 40, switch hub 50 and router 60, thereby can automatically carry out forwarding for the frame of switch hub 50 setting of controlling, and the setting of controlling for the package forward of router 60.Below, communication terminal 40, switch hub 50 and router 60 are elaborated.

<A-1-1: the structure of communication terminal 40>

Fig. 2 means the block diagram of the structure of communication terminal 40.As shown in Figure 2, communication terminal 40 comprises: control part 410, communication interface (below be called I/F) section 420, user I/F section 430, storage part 440 and as the bus 450 of the intermediary of the data transmit-receive between these structural elements.Control part 410 is CPU, by execution, is stored in program in storage part 440 and works as the control axis of communication terminal 40.Communication I/F section 420 is for example NIC(Network Interface Card).Communication I/F section 420 receives the Data Concurrent come from switch hub 50 forwardings as its linking objective and delivers to control part 410, and on the other hand, the data that will send from control part 410 be sent to this switch hub 50.

User I/F section 430 comprises: for the Speech input/efferent of the I/O of carrying out sound, the display part that shows various pictures, numerical key etc. for making the user carry out the operating portion (all omitting diagram) of the input of various data.In communication terminal 40A, 40B, 40D and 40E, via the 430 input users' of user I/F section sound, going forward side by side works talks about the output of object sound.In addition, in communication terminal 40C and 40F, carry out the I/O of various data (text data sent to the other side etc.) via user I/F section 430.

As shown in Figure 2, storage part 440 comprises non-volatile memories section 442 and volatile storage section 444.Non-volatile memories section 442 is for example hard disk.In this non-volatile memories section 442, store for carrying out audio communication according to VoIP or carrying out the signal procedure (at Fig. 2, omitting diagram) of the sending/receiving etc. of text data according to HTTP.In addition, store the priority notification procedure for making the priority notifier processes shown in control part 410 execution graphs 3 in non-volatile memories section 442 and mean the priority data of the priority of the data communication that this communication terminal 40 is performed.Contents processing to this priority notifier processes describes in the back.In the present embodiment, the data of using as priority data are certain values in " 0 ", " 1 " or " 2 ".If illustrate in greater detail, at communication terminal 40A and 40D medium priority data in advance, be stored as " 0 ", be stored as " 1 " at communication terminal 40B and 40E medium priority data in advance, be stored as " 2 " at communication terminal 40C and 40F medium priority data in advance.That is, the value of the priority data of present embodiment is less, and represented priority is higher.Priority data gets final product in advance to for example writing by user I/F section 430 is operated by the user of communication terminal 40 or the running management personnel that accommodate the network of this communication terminal 40 of non-volatile memories section 442.

Volatile storage section 444 is for example RAM(Random Access Memory), the working region during as various programs such as executive communication program or priority notification procedure is used.In addition, as shown in Figure 2, storage neighbouring device information in volatile storage section 444.At this, so-called neighbouring device information, refer to the information (in the present embodiment, being the MAC Address as the switch hub 50 of the linking objective of this communication terminal 40) of relay that means to have carried out to this communication terminal 40 forwarding of frame.Although can be described in detail in the back, neighbouring device information is to carry out in the implementation of priority notification procedure to writing of volatile storage section 444.Below, before the detailed description of the contents processing of the priority notifier processes of carrying out according to priority notification procedure, the data configuration that carries out the frame of sending/receiving in the network had under its command at router 60 is described.

Fig. 4 (A) means the figure of the data configuration of the common frame that carries out sending/receiving in the network had under its command at router 60.As shown in Fig. 4 (A), frame has head and pay(useful) load section.In head, storage sends destination-mac address, transmission source MAC Address and classification logotype symbol.So-called transmission destination-mac address refers to the MAC Address of the equipment that becomes the transmission of this frame target, and so-called transmission source MAC Address refers to the MAC Address of the equipment that has sent frame.So-called classification logotype symbol refers to the data of the classification that means this frame (such as the packet that writes which kind of type in pay(useful) load section etc.).

Carry out in the network had under its command at router 60 in the frame of sending/receiving, as the frame of the feature that shows significantly present embodiment, enumerated claim frame, priority notification frame, neighbouring device notification frame and set these 4 kinds of change indication frames.About these 4 kinds of frames, as the classification logotype symbol, write common value (with respect to the frame relevant to audio communication or the frame relevant with the data communication of text data, being different values).So-called claim frame refers to, the loopback of the communication terminal 40 Request Priority notification frame that router 60 is accommodated in the network for linchpin downwards respectively, the frame that carries out the multicast transmission to the network had under its command to the loopback of the switch hub 50 request neighbouring device notification frame that comprise in consolidated network.So-called priority notification frame refers to, as the response corresponding with the described request frame and by the frame of communication terminal 40 loopbacks (clean culture transmission), so-called neighbouring device notification frame refers to, the frame to the transmission source loopback (clean culture transmission) of this claim frame as the response corresponding with the described request frame and by switch hub 50.Below, in the situation that, without distinguishing neighbouring device notification frame and priority notification frame, simple marking is " notification frame ".And the so-called change indication frame of setting refers to, the frame that router 60 sends to the switch hub 50 comprised in the network had under its command in order to indicate frame to forward the setting change of the priority in controlling.

Fig. 4 (B) means the figure of data configuration of the pay(useful) load section of claim frame.As shown in Fig. 4 (B), write in the pay(useful) load section of claim frame and sent destination-mac address, transmission source MAC Address, message classification logotype symbol and forward source identifier.The transmission destination-mac address of the pay(useful) load section of claim frame is identical with the transmission destination-mac address write in the head of this frame, about the transmission source MAC Address of this pay(useful) load section, is also identical situation.Be provided with in message classification logotype symbol and mean that this frame is which the value in the frame of described 4 types.Following situation for example,, in the situation that use character code data as message classification logotype symbol, be provided with respectively the character code of expression " 1 " (or " A ") as message classification logotype symbol in claim frame, be provided with the character code of expression " 2 " (or " B ") as message identifier in the priority notification frame, be provided with the character code of expression " 3 " (or " C ") as message identifier in the neighbouring device notification frame, be provided with the character code of expression " 4 " (or " D ") as message classification logotype symbol in setting change indication frame.In forwarding source identifier, the MAC Address of its transmission source is set when the transmission of claim frame, when carrying out the forwarding of this frame by switch hub 50, be rewritten as the MAC Address of the switch hub 50 that has carried out this forwarding at every turn.Detailed content is narrated in the back, and switch hub 50 and communication terminal 40 in the situation that receive claim frame, by the forwarding source identifier with reference to this claim frame, just can be determined the relay that has carried out the forwarding of this claim frame to this device.

Fig. 4 (C) means the figure of data configuration of the pay(useful) load section of neighbouring device notification frame.As shown in Fig. 4 (C), in the pay(useful) load section of neighbouring device notification frame, except sending destination-mac address, transmission source MAC Address, message classification logotype symbol and forwarding source identifier, also write the neighbouring device information list.Detailed content is narrated in the back, so-called neighbouring device information list refer to mean to the transmission source switch hub of this neighbouring device notification frame carried out frame forwarding equipment MAC Address and receive the information of the corresponding relation between the communication port of this frame.Fig. 4 (D) means the figure of data configuration of the pay(useful) load section of priority notification frame.As shown in Figure 4 (D) shows, except sending destination-mac address, transmission source MAC Address, message classification logotype symbol and forwarding source identifier, also write neighbouring device information and the priority data of the transmission source communication terminal 40 of this priority notification frame in the pay(useful) load section of priority notification frame.Detailed content is narrated in the back, and router 60 and switch hub 50 in the situation that receive these notification frame, by the forwarding source identifier with reference to this notification frame, just can be determined the device that has carried out the forwarding of this notification frame to this device.

Fig. 4 (E) means the figure of the data configuration of the pay(useful) load section that sets change indication frame.As shown in Fig. 4 (E), in the pay(useful) load section that sets change indication frame, except sending destination-mac address, transmission source MAC Address, message classification logotype symbol, also write and set the change designation data.Include in setting the change designation data and mean for the port identifiers of the switch hub 50 strains communication port that more preferably level is set that changes the transmission target of indicating frame as this setting and the priority data of this priority of expression.More than to carry out the data configuration of the frame of sending/receiving in the network had under its command at router 60.

Next, with reference to Fig. 3, the detailed content of priority notifier processes is described.This priority notifier processes is carried out with being received as opportunity of claim frame.At this, for received frame, whether be claim frame, as long as the message classification logotype write in the pay(useful) load section with reference to this received frame accords with and judges.As shown in Figure 3, in the priority notifier processes, the forwarding source identifier that at first control part 410 will be written in the pay(useful) load section of the claim frame received writes to (step SA100) in volatile storage section 444 as neighbouring device information.Then, control part 410 generates described priority notification frame, to the transmission source loopback (clean culture transmission) (step SA110) of described request frame.In this step SA110 in the pay(useful) load section of the priority notification frame of control part 410 loopbacks, write the MAC Address of this communication terminal 40 as forwarding source identifier, and the priority data of storage in the neighbouring device information of storage write volatile storage section 444 in this pay(useful) load section in and non-volatile memories section 442.

It is more than the structure of communication terminal 40.

<A-1-2: the structure of switch hub 50>

Fig. 5 means the block diagram of the structure of switch hub 50.As shown in Figure 5, switch hub 50 has: communication I/F section 510, switching engine section 520 and storage part 530.Communication I/F section 510 has a plurality of communication port.Above-mentioned a plurality of communication port is respectively via connecting with other communicators (in the present embodiment, be router 60 or other switch hubs 50, or communication terminal 40) such as the communications cable such as 100BASE-T.In above-mentioned a plurality of communication port, distribute intrinsic port identifiers (for example, port numbering) to each communication port in advance respectively, use this port identifiers can identify uniquely each communication port.The frame that communication I/F section 510 will receive via each communication port is sent to switching engine section 520, and on the other hand, the frame that will send from switching engine section 520, send from the communication port by these switching engine section 520 indications.

Storage part 530 comprises such as volatile memory and EPROM(Erasable Programmable Read Only Memory such as RAM) etc. nonvolatile memory (in Fig. 5 all omit diagram).Pre-stored in this nonvolatile memory have a firmware (program), and this firmware (program) is for making switching engine section 520 carry out the processing of the feature that obviously shows switch hub of the present invention.Working region when on the other hand, volatile memory is used as the above-mentioned firmware of execution by switching engine section 520.In addition, above-mentioned volatile memory plays the effect of the buffer of the frame received by communication I/F section 510 for temporary transient storage, and, the neighbouring device table of the mac address table of storage map 5 and this Fig. 5 in this volatile memory.

The mac address table that the mac address table of Fig. 5 has from existing switch hub is compared not different especially.In this mac address table, be associated with transmission source MAC Address by the frame that receives of communication I/F section 510 and store the port identifiers of the communication port that receives this frame.The action that MAC Address and port identifiers are write to mac address table, be accompanied by frame described later and forward and control and carry out.For example, the frame of frame (writing ARP(Address Resolution Protocol the pay(useful) load section) packet sent from communication terminal 40 in the MAC Address in order to resolve router 60) in repeating process, execution is associated the transmission source MAC Address of this frame (that is, the MAC Address of communication terminal 40) and write the processing in mac address table with the port identifiers of the receiving port of this frame.On the other hand, in the repeating process of the response frame corresponding with this frame, execution is associated the transmission source MAC Address of this frame (that is, the MAC Address of router 60) and write the processing in mac address table with the port identifiers of the receiving port of this frame.The storage content of this mac address table is being used based on sending when destination-mac address carries out the forwarding control of frame.

In the neighbouring device table, each port identifiers of a plurality of communication port that have with communication I/F section 510 is associated and stores the linking objective identifier (in the present embodiment, MAC Address for this communicator), this linking objective identifier illustrates the forwarding sources traffic device of the frame received via this communication port uniquely.This neighbouring device table is that to take that the power supply (omit diagram) of switch hub 50 connects be opportunity, with each linking objective identifier, be made as NULL(0x00) the state generation.And, carry out predetermined particular frame (in the present embodiment with switch hub 50, for above-mentioned claim frame and notification frame) relaying together, carry out the renewal (that is linking objective identifier that, will be corresponding with the port identifiers of the communication port that receives above-mentioned frame is rewritten as the forwarding source identifier of this frame) of the storage content of this table.

Switching engine section 520 is for example CPU(Central Processing Unit).Switching engine section 520 is by carrying out the firmware of storage in storage part 530, thereby in return the control axis of formula hub 50 works.The switching engine section 520 of being moved according to this firmware, at every turn via certain communication port received frame the time, writes to this frame in the buffer in volatile memory, respectively for the processing shown in the flow chart of above-mentioned frame execution graph 6.As shown in Figure 6, the processing that in return engine section 520 carries out according to above-mentioned firmware, enumerated frame forwarding control processing, neighbouring device notification frame transmission processing and priority level initializing change and processed these 3 kinds.

As shown in Figure 6, switching engine section 520 is at first with reference to the message classification logotype symbol of the transmission destination-mac address of the head of received frame and its pay(useful) load section and judge whether this frame received is that frame (step SB100) is indicated in the setting change sent to this device.That is, in the situation that send MAC Address and the message classification logotype symbol that destination-mac address is this device, mean to set change indication frame, the result of determination of above-mentioned steps SB100 is "Yes".And switching engine section 520 is in the situation that the result of determination of step SB100 is "Yes", execution priority is set change and is processed (step SB110), otherwise, in the situation that the result of determination of step SB100 is "No", the execution frame forwards to control and processes.

Process in the situation that the result of determination of the step SB100 frame that to be "No" performed forwards to control, comprise the transmission destination-mac address based on received frame and carry out the processing (step SB190) that the forwarding of this received frame is controlled.At this, so-called transmission destination-mac address based on received frame and the forwarding carried out are controlled and are referred to, in the situation that this transmission destination-mac address be not unicast address, maybe this transmission destination-mac address is not the unicast address of storing in mac address table, carry out flooding of this received frame, on the other hand, in the situation that this transmission destination-mac address is the unicast address of storing in mac address table, this received frame only is stored in to the communication port shown in the port identifiers mac address table from being associated with this MAC Address and sends.At this, as the MAC Address that is not unicast address, multicast address or broadcast address have been enumerated.In addition, what is called floods and refers to that the whole communication port outside the communication port from receiving received frame send this received frame.The forwarding of carrying out based on this transmission destination-mac address is controlled and is compared different especially from the forwarding control in existing switch hub.In other words, in existing switch hub, forward to control as frame and process the forwarding control (that is, the processing of step SB190) of only carrying out based on described transmission destination-mac address.

In the situation that the result of determination of step SB100 is "Yes", performed priority level initializing change is processed, and is the processing that the priority in the time of will carrying out the processing of step SB190 for each frame the buffer be accumulated in volatile memory according to the indication of sending from router 60 is changed.The priority level initializing change pack processing of present embodiment is containing VLAN(Virtual Local Area Network) change of setting and the setting of QoS change.At this, so-called VLAN sets the communication port referred to receive the change indication of carrying out priority level initializing from router 60 and removes from the object flooded and virtually the network segment separated.By VLAN, set, the multicast address received via the communication port of other network segments can not sent to the communication port of carrying out network segment separation, and therefore, the data communication of carrying out via this communication port can not be subject to the obstruction of the forwarding of multicast frames.On the other hand, so-called QoS refers in the processing of step SB190, when carrying out the processing that frame is sent to the communication port that sends target corresponding to it, in buffer accumulation have with this frame, compare frame that priority is higher during, suspend sending of this frame.By carrying out above-mentioned QoS, the forwarding that the frame that is subject to low priority is controlled in the forwarding that can avoid being assigned the frame of high priority is controlled and is hindered.In the priority level initializing change of present embodiment is processed, switching engine section 520 is for the communication port that is instructed to priority to be made as " 0 ", set the separation of carrying out the network segment by above-mentioned VLAN, and, will be about the priority level initializing in the QoS of the frame (or sending the frame to this communication port) that receives via this communication port for the highest.In addition, for the communication port that is instructed to priority to be made as " 1 ", switching engine section 520 only carries out the setting change of QoS, by the priority level initializing in QoS, is inferior high.

The frame of present embodiment forwards to control and processes except the processing of above-mentioned step SB190, also comprises the processing of step SB120 to SB160.As shown in Figure 3, at first switching engine section 520 judges whether write forwarding source identifier (step SB120) in the pay(useful) load section of this received frame.At this, as whether writing the concrete decision method that forwards source identifier in the pay(useful) load section at received frame, can expect several different methods.For example, it can be this zone of the direct pay(useful) load section with reference to received frame, the mode of being judged by whether writing the content that is equivalent to MAC Address, whether can be in addition, be some modes of being judged of claim frame, neighbouring device notification frame and priority notification frame by received frame.As mentioned above, in the network had under its command at router 60, carry out in the frame of sending/receiving, writing what forward source identifier in pay(useful) load section is only these 3 kinds of claim frame, neighbouring device notification frame and priority notification frame.For example, an in the situation that rear mode, the classification logotype symbol write in the head of received frame means the frame of described 4 types, and the message classification logotype symbol be written in its pay(useful) load section means that in some situations of claim frame, neighbouring device notification frame or priority notification frame, the result of determination of step SB120 is "Yes".

In the situation that the result of determination of step SB120 is "No", switching engine section 520 is with reference to transmission destination-mac address and the classification logotype symbol of the head of received frame, to this received frame, whether be that the audio communication frame (that is, in pay(useful) load section, writing the frame of voice data bag) of sending to IP network from the network had under its command for audio communication is judged (step SB130).For example, in the situation that the classification logotype of the MAC Address of the communication terminal 40 of accommodating in the network that the transmission destination-mac address of received frame is not this device to be had under its command and this received frame symbol illustrates VoIP, the result of determination of step SB130 is "Yes".Switching engine section 520 is in the situation that the result of determination of step SB130 is "Yes", the DSCP value of the voice data bag in the pay(useful) load section of this audio communication frame will be written in, rewritten (step SB140) corresponding to the priority of its transmission source, then, the processing of execution step SB190.Otherwise, in the situation that the result of determination of step SB130 is "No", switching engine section 520 does not carry out the processing of step SB140, but the processing of execution step SB190.So-called DSCP value means the value of the priority when forwarding of carrying out the voice data bag in the 3rd layer is controlled.Detailed content is narrated in the back, by carry out in advance the rewriting of DSCP value in switch hub 50, thereby, for send the voice data bag to IP network from router 60, can expect that the package forward control in IP network is carried out corresponding to the priority of the communication terminal 40 as its transmission source.In addition, in the present embodiment, for send the voice data bag to IP network from router 60, the package forward carried out for the priority of the communication terminal 40 corresponding to as its transmission source in IP network is controlled, carry out the rewriting of DSCP value, but can certainly use other indexs such as CoS value or TOS value.

Corresponding thereto, in the situation that the result of determination of step SB120 be "Yes" (, received frame is in some situations of claim frame, priority notification frame or neighbouring device notification frame), switching engine section 520 will be associated with the port identifiers of the communication port that receives this received frame and be stored in the forwarding source identifier (step SB150) that neighbouring device identifier in the neighbouring device table is rewritten as this received frame, and, the forwarding source identifier of this received frame is rewritten as to the MAC Address (step SB160) of this device.Then, switching engine section 520 accords with and judges whether received frame is claim frame (step SB170) with reference to the message classification logotype of the pay(useful) load section of received frame, in the situation that this result of determination is yes, after carrying out neighbouring device notification frame transmission processing (step SB170), the processing of execution step SB190.In neighbouring device notification frame transmission processing, switching engine section 520 generates above-mentioned neighbouring device notification frame, and to the transmission source loopback (clean culture transmission) of above-mentioned claim frame.As the neighbouring device information list, will write in the pay(useful) load section of this neighbouring device notification frame by the storage content of the neighbouring device table after the processing renewal of above-mentioned steps SB150.Otherwise, in the situation that the result of determination of step SB170 is "No", switching engine section 520 does not perform step the processing of SB180, and the processing of execution step SB190.

<A-1-3: the structure of router 60>

Fig. 7 means the block diagram of the structure of router 60.As shown in Figure 7, router 60 has: communication I/F section 610, routing engine section 620 and storage part 630.Communication I/F section 610 has a plurality of ports in the same manner with the I/F section 510 that communicates by letter of switch hub 50, and each port assignment has intrinsic port identifiers.For example, in router 60A, 2 in above-mentioned a plurality of ports are connected with switch hub 50A with IP network respectively.Communication I/F section 610 with communicate by letter I/F section 510 in the same manner, the frame that will receive via each communication port is sent to routing engine section 620, on the other hand, the frame that will send from routing engine section 620, send from the communication port of being indicated by this routing engine section 620.

Storage part 630 also with the storage part 530 of switch hub 50 in the same manner, include the nonvolatile memories (omitting diagram) such as the volatile memory such as RAM and EPROM.Store firmware in this nonvolatile memory.In the present embodiment, obviously show the function of the router 60 of present embodiment feature by make 620 actions of routing engine section realize according to this firmware.On the other hand, working region when volatile memory is used as the above-mentioned firmware of execution by routing engine section 620, and, play the effect of the buffer of the frame (or packet) arrived for temporary transient accumulative reception.In addition, in this volatile memory the routing table shown in storage map 7, about mac address table and these tables of neighbouring device table of this router 60.

Routing engine section 620 is identical with the switching engine section 520 of switch hub 50, is CPU.Routing engine section 620 carries out the firmware of storage in storage parts 630, as the control axis of router 60, works.Routing engine section 620 is according to above-mentioned firmware, and processing, multicast transmission processing are controlled in the forwarding of executing data bag, annexation is definite processes and these 4 kinds of processing of priority level initializing control processing.In above-mentioned 4 kinds of processing, package forward is controlled and is processed compared with prior art not special difference.Therefore, below, determine that with multicast transmission processing, annexation processing and priority level initializing control are treated to center and describe.

It is the processing that network (if router 60A is LAN1A, if router 60B is LAN1B) that claim frame is had under its command to router 60 carries out the multicast transmission that multicast transmit to be processed.Detailed content is narrated in the back, in the present embodiment, this multicast transmits the power supply (omitting diagram) of processing at router 60 connect after, every through stipulated time T(for example, 3 seconds) and periodically carry out.

In annexation, determine in processing, routing engine section 620 is at first with the opportunity that is received as of the notification frame of sending from each switch hub 50, will be associated with the port identifiers of the communication port that receives this notification frame and the linking objective identifier that is stored in the neighbouring device table is rewritten as the forwarding source identifier in the pay(useful) load section that is written in this frame.And, routing engine section 620 is according to the storage content of the neighbouring device table of this device, from the neighbouring device information list of each switch hub 50 loopbacks with from the neighbouring device information of communication terminal 40 loopbacks, and generates the topological data of the annexation (network topology) of each device in the network that means to have under its command.

If describe in more detail, the storage content of the neighbouring device table of routing engine section 620 based on this device, neighbouring device information list from switch hub 50 loopbacks, with the neighbouring device information from communication terminal 40 loopbacks, for this device, each switch hub 50 and each communication terminal 40 and generate respectively the tectosome data of the bi-directional list structure formed by the 1st pointer and one or more the 2nd pointers, using the set of these tectosome data as the above topology data, wherein, the 1st pointer (for example, the data of the port identifiers of the communication port that expression is connected with the upstream side neighbouring device and the MAC Address of this upstream side neighbouring device etc.) mean the upstream side neighbouring device, the 2nd pointer (for example, the data of the port identifiers of the communication port that expression is connected with the downstream neighbouring device and the MAC Address of this downstream neighbouring device etc.) mean the downstream neighbouring device.At this, so-called upstream side neighbouring device refers to the neighbouring device that approaches router 60 sides, and so-called downstream neighbouring device refers to the neighbouring device away from this router 60 sides.For example, in the LAN1A of Fig. 1, the upstream side neighbouring device of switch hub 50A is router 60, and the downstream neighbouring device is communication terminal 40A and switch hub 50B.In addition, the router 60 about as Fig. 1, do not have in the tectosome data of device of upstream side neighbouring device, in above-mentioned the 1st pointer, NULL being set gets final product, in the same manner, the communication terminal 40 about as Fig. 1, do not have, in the tectosome data of device of downstream neighbouring device, in above-mentioned the 2nd pointer, NULL to be set and to get final product.

In the situation that the set of the tectosome data of above-mentioned bi-directional list structure is used as topological data, using the 2nd pointer from upstream side, while from downstream use the 1st pointer, exploring 2 devices adjacent one another are, all must can not produce contradiction.For example, at the LAN1A to Fig. 1 in relevant topological data, must switch hub 50B be shown by the 2nd pointer of the tectosome data corresponding with switch hub 50A, by the 1st pointer of the tectosome data corresponding with switch hub 50B, switch hub 50A be shown.Therefore, although for example occurring to have notified switch hub 50A from switch hub 50B as neighbouring device, but from switch hub 50A, as neighbouring device, notify the absence of this contradiction of switch hub 50B, routing engine section 620 only generates topological data in the scope that does not produce contradiction.

Next, with reference to Fig. 8, the contents processing that priority level initializing control is processed is described.This priority level initializing is controlled and processed is the processing of carrying out with being received as opportunity of priority notification frame.Fig. 8 means the flow chart of the flow process that priority level initializing control is processed.As shown in Figure 8, at first routing engine section 620 judges with reference to topological data whether communication terminal 40 and the communication path between this device as the transmission source of this priority notification frame have obtained determining (step SC100).If illustrate in greater detail, in tectosome data that can be corresponding according to the communication terminal 40 of the transmission source with as the priority notification frame, sequentially along the 1st pointer, arrive to the situation of this router 60, the result of determination of step SC100 is "Yes".And, routing engine section 620 is in the situation that the result of determination of step SC100 is "Yes", priority shown in the priority data write in pay(useful) load section corresponding to above-mentioned priority notification frame and the package forward that changes this device priority level initializing (step SC110) in controlling, and each switch hub 50 on said communication paths sends (clean culture transmission) setting change indication frame (SC120).

It is more than the structure of router 60.

<A-2: action>

Below, there are respectively 8 communication port with router 60 and switch hub 50, and in LAN1A as shown in Figure 9 and interconnective situation is example, the action of present embodiment is described.In Fig. 9, mean communication port with the circle of blacking, with the port numbering of this communication port of numeral with #.As shown in Figure 9, the communication port of the port numbering of router 60A=1 is connected with switch hub 50A, if observe from switch hub 50A, the communication port of the port numbering of router 60A and switch hub 50A=2 is connected.As shown in Figure 9, the communication port of the port numbering of switch hub 50A=3 is connected with communication terminal 40A, and the communication port of port numbering=4 is connected with switch hub 50B.If observe from switch hub 50B, the communication port of the port numbering of switch hub 50A and switch hub 50B=5 is connected, the communication port of the port numbering of switch hub 50B=6 is connected with communication terminal 40B, and the communication port of its port numbering=7 is connected with communication terminal 40C.In addition, below the zero hour of the action of explanation, the linking objective identifier of the neighbouring device table of router 60 and switch hub 50 empties as NULL.

The routing engine section 620 of router 60A, after the power supply (omitting diagram) of router 60A is connected, carries out the multicast transmission at the moment T0 that has passed through stipulated time T to claim frame.Like this, the at first exchanged formula hub of the claim frame 50A sent out from router 60A multicast receives.The switching engine section 520 of switch hub 50A receives above-mentioned claim frame via the communication port of port numbering=2, and each of the step SB150 of execution graph 6, SB160, SB180 and SB190 processed.Because received frame is claim frame, therefore, the result of determination of step SB100 is "No", and the result of determination of SB120 and SB170 is "Yes".

Processing due to execution step SB150, therefore, the linking objective identifier that is associated with port numbering=2 and is stored in the neighbouring device table of switch hub 50A is rewritten as the forwarding source identifier (that is, the MAC Address of router 60) of giving in received frame.In addition, the forwarding source identifier of this received frame is rewritten as the MAC Address of switch hub 50A by the processing of step SB160.In step SB180, for the neighbouring device notification frame after writing as neighbouring device information by the storage content of the neighbouring device table after the processing renewal of step SB150, from switch hub 50A to router, 60 carry out the clean culture transmission.And, in step SB190, carry out the flooding of revised claim frame of having carried out forwarding source identifier by the processing of step SB160.As noted above, its reason is, the transmission destination-mac address of claim frame is multicast address.Like this, the claim frame flooded is received respectively by communication terminal 40A and switch hub 50B.

If the control part 410 of communication terminal 40A receives claim frame via communication I/F section 420, carry out above-mentioned priority notifier processes (with reference to Fig. 3).If illustrate in greater detail, control part 410 writes to (Fig. 3: step SA100) in volatile storage section 444 by the forwarding source identifier (that is, the MAC Address of switch hub 50A) write in the pay(useful) load section of above-mentioned claim frame as neighbouring device information.Then, control part 410 generates the transmission source MAC Address of above-mentioned claim frame (that is, the MAC Address of router 60A) is made as to the priority notification frame that sends destination-mac address, sends this priority notification frame (Fig. 3: step SA110).The MAC Address of communication terminal 40A is write in the pay(useful) load section of this priority notification frame as forwarding source identifier, and write priority data and the neighbouring device information of communication terminal 40A.

If the switching engine section 520 of switch hub 50B receives from switch hub 50A and forwards the claim frame of coming, with the switching engine section 520 of switch hub 50A in the same manner, each of the step SB150 of execution graph 6, SB160, SB180 and SB190 processed.If illustrate in greater detail, the switching engine section 520 of switch hub 50B is in the neighbouring device table of this device, (linking objective identifier that will be corresponding with port numbering=5 is rewritten as the forwarding source identifier given from the claim frame that switch hub 50A forwards, the MAC Address of switch hub 50A), neighbouring device notification frame for the storage content using this revised neighbouring device table after the neighbouring device information list writes, carry out the clean culture transmission to router 60.On this basis, the switching engine section 520 of switch hub 50B carries out forwarding source identifier and be rewritten as flooding of claim frame after the MAC Address of switch hub 50B.

As mentioned above, the claim frame that has carried out flooding is received by communication terminal 40B and 40C respectively.Communication terminal 40B(or communication terminal 40C) control part 410 with the opportunity that is received as of this claim frame, carry out the priority notifier processes (with reference to Fig. 3) identical with the control part 410 of communication terminal 40A.Its result, write to communication terminal 40B(or 40C using the MAC Address of switch hub 50B as neighbouring device information) volatile storage section 444 in, to router 60 loopbacks by this neighbouring device information, communication terminal 40B(or 40C) priority data be written in the priority notification frame in pay(useful) load section.As the execution result of action discussed above, the storage content of the neighbouring device table of switch hub 50A and 50B and the neighbouring device information of communication terminal 40A, 40B and 40C become the state shown in Figure 10.

Below, the forwarding control that is accompanied by notification frame is described and the renewal of the neighbouring device table carried out.If the switching engine section 520 of switch hub 50B is via port numbering=6(or 7) communication port receive from communication terminal 40B(or communication terminal 40C) the priority notification frame that transmits to router 60 clean cultures, the processing of the step SB150 of execution graph 6, SB160 and SB190.Because received frame is the priority notification frame, therefore, the result of determination of step SB100 and SB170 is "No", and the result of determination of step SB120 is "Yes".

Processing due to execution step SB150, therefore be associated with the port identifiers of the communication port that receives the priority notification frame and be stored in the linking objective identifier in the neighbouring device table of switch hub 50B, be rewritten as the forwarding source identifier given in received frame (, communication terminal 40B(or communication terminal 40C) MAC Address), the forwarding source identifier of this received frame is rewritten as the MAC Address of switch hub 50B by the processing of step SB160.And, in step SB190, the priority notification frame that will carry out forwarding the rewriting of source identifier by the processing of step SB160 is sent via the communication port of port numbering=5.

If the switching engine section 520 of switch hub 50A receives the priority notification frame sent from communication terminal 40A or forwards next notification frame (from switch hub 50B, the neighbouring device notification frame that switch hub 50B sends or the priority notification frame forwarded by switch hub 50B), in the same manner, the processing of the step SB150 of execution graph 6, SB160 and SB190.Switch hub 50A will be corresponding with the communication port that receives above-mentioned notification frame the linking objective identifier be rewritten as the forwarding source identifier given in this notification frame (if the notification frame forwarded by switch hub 50B, it is the MAC Address of this switch hub 50B, if the priority notification frame sent from communication terminal 40A, be the MAC Address of this communication terminal 40A), be forwarded to router 60 after the forwarding source identifier of this notification frame being rewritten as to the MAC Address of this device.If router 60 receives via the communication port of port numbering=1 notification frame forwarded from switch hub 50A, linking objective identifier that will be corresponding with this port numbering in the neighbouring device table of this device is rewritten as the forwarding source identifier of this frame.As the execution result of above illustrated action, the storage content of router 60, switch hub 50A and 50B neighbouring device table separately is updated to the state shown in Figure 11 from the state shown in Figure 10.Clearly known with reference to Figure 11, express to the neighbouring device information noncontradictory of the storage content of above-mentioned neighbouring device table and each communication terminal 40 network topology in LAN1A.

At this, the point that should pay close attention to is, in action described above, the neighbouring device information list write from the neighbouring device notification frame of switch hub 50A and 50B reception at router 60A, not corresponding to the storage content of the neighbouring device table shown in Figure 11, but corresponding to the storage content of the neighbouring device table shown in Figure 10.In the storage content of each neighbouring device table shown in Figure 10, the annexation of router 60A and switch hub 50A only is shown to noncontradictory.Therefore, in the moment received for the notification frame of the claim frame that carries out the multicast transmission at moment T0, routing engine section 620 generates the topological data of the annexation that only means router 60A and switch hub 50A.

And, if pass through stipulated time T from moment T0, routing engine section 620 carries out the multicast transmission by claim frame again, switch hub 50A and 50B carry out respectively processing same as described above.In each neighbouring device notification frame of switch hub 50A and 50B loopback, write the neighbouring device information list corresponding with the storage content of the neighbouring device table shown in Figure 11 in the response as for the claim frame sent out from router 60A at moment T0+T.Therefore, receiving for the claim frame transmitted in moment T0+T multicast (, if the multicast of T0 transmits as the 1st time constantly, the multicast that is the 2nd time transmits) and the moment of the neighbouring device notification frame of loopback, routing engine section 620 generates the topological data of the annexation of the whole communicators that mean that these devices and this device have under its command.The running management personnel of LAN1A are by browsing the topological data of above-mentioned generation, thereby can grasp the network topology of LAN1A.

The routing engine section 620 of router 60A, when the priority notification frame at every turn received respectively from communication terminal 40A, 40B and 40C loopback, carries out above-mentioned priority level initializing and controls and process (with reference to Fig. 8).As noted above, at this priority level initializing, control in processing, can routing engine section 620 judge the communication path (step SC100) between the transmission source that determine this device and this priority notification frame with reference to topological data.As noted above, the moment of the notification frame of loopback receiving for the claim frame that carries out the multicast transmission at moment T0, only generate the topological data (that is, the tectosome data corresponding with router 60A and the tectosome data corresponding with switch hub 50A) of the annexation that only means router 60A and switch hub 50A.Like this, receiving for the claim frame that carries out the multicast transmission at moment T0, the moment of the priority notification frame of loopback does not generate corresponding with communication terminal 40A, 40B and 40C respectively tectosome data, and the result of determination of step SC100 is "No".That is, receiving for the claim frame that carries out the multicast transmission at moment T0, the moment of the priority notification frame of loopback does not perform step SC110 and later processing thereof.

Corresponding thereto, the moment of the priority notification frame of loopback receiving for the claim frame transmitted in moment T0+T multicast, as noted above, generate corresponding with router 60A, switch hub 50A, 50B, communication terminal 40A, 40B and 40C respectively tectosome data.Therefore, for example, in the situation that receive the priority notification frame sent from communication terminal 40B, the linking objective that routing engine section 620 determines this communication terminal 40B with reference to the 1st pointer of the tectosome data corresponding with this communication terminal 40B is switch hub 50B, and the communication port of determining the port numbering of this communication terminal 40B and switch hub 50B=6 with reference to the 2nd pointer of the tectosome data corresponding with switch hub 50B is connected.In addition, routing engine section 620 determines this switch hub 50B with reference to the 1st pointer of the tectosome data corresponding with switch hub 50B and is connected with switch hub 50A, and the communication port that the 2nd pointer of the tectosome data that reference is corresponding with switch hub 50A is determined the port numbering of switch hub 50B and switch hub 50A=4 is connected.And, routing engine section 620 determines this switch hub 50A with reference to the 1st pointer of the tectosome data corresponding with switch hub 50A and is connected with this device, with reference to this 2nd pointer that installs corresponding tectosome data, determining switch hub 50A, with the communication port of port numbering=1, is connected.Thus, determine the communication path between router 60A and communication terminal 40B.

As mentioned above, due to the communication path of determining between this device and communication terminal 40B, therefore, the result of determination of step SC100 is "Yes", execution step SC110 and later processing thereof.As noted above, write the priority notification frame sent from communication terminal 40B and mean the priority data of priority for " 1 ".Therefore, in step SC110, carry out the priority level initializing of package forward control, so that as long as no the communication terminal from carrying out the data communication that priority is " 0 " (limit priority) (in the present embodiment, for communication terminal 40A) packet that sends, the packet that override ground will send from communication terminal 40B is sent to IP network, in addition, in the situation that receive and take the packet that communication terminal 40B is target via IP network, packet as long as no the communication terminal that will carry out the data communication that priority is " 0 " as the transmission target, override ground is sent this packet to switch hub 50A.And, in step SC120, each switch hub 50(to the communication path from router 60A to communication terminal 40B is, switch hub 50A and 50B) send and set change indication frame, write and set the change designation data in this setting change indication frame, the priority that setting change designation data illustrates the communication port that is connected with this communication terminal 40B and the data communication that will carry out via this communication port is made as " 1 ".Specifically, send and set change indication frame to switch hub 50A, write and set the change designation data in the pay(useful) load section of this setting change indication frame, set that the change designation data illustrates port numbering=4 and the priority of the data communication that will carry out via the communication port of this port numbering is made as " 1 ".On the other hand, send and set change indication frame to switch hub 50B, write and set the change designation data in the pay(useful) load section of this setting change indication frame, set that the change designation data illustrates port numbering=6 and the priority of the data communication that will carry out via the communication port of this port numbering is made as " 1 ".

If the switching engine section 520 of switch hub 50A or 50B receives the setting change indication frame (the step SB100 of Fig. 6: be) sent from router 60, the content shown in the setting change designation data write in the pay(useful) load section according to this setting change indication frame changes the setting (the step SB110 of Fig. 6) that frame forwards the priority while controlling.Priority shown in the setting change designation data write in the pay(useful) load section of above-mentioned setting change indication frame is " 1 ", and therefore, switching engine section 520 only carries out the setting change of QoS for the communication port shown in this setting change designation data.Specifically, the setting of QoS is changed to, the frame received as long as no the communication port that is " 0 " via priority (or frame from the communication port of " 0 " to priority that send for), the forwarding of the frame (or frame of sending to this communication port) received via the communication port shown in this setting change designation data is carried out on override ground.

Corresponding thereto, if routing engine section 620 receives the priority notification frame sent from communication terminal 40A, will set change indication frame and be sent to switch hub 50A, wherein, write and set the change designation data in this setting change indication frame, set that the change designation data illustrates port numbering=3 and the priority of the data communication that will carry out via the communication port of this port numbering is made as " 0 ".If the switching engine section 520 of switch hub 50A receives this setting change indication frame, change in the following manner the setting that frame forwards the priority while controlling.; priority shown in the setting change designation data write in pay(useful) load section due to above-mentioned setting change indication frame is " 0 "; therefore; set the network segment of the communication port shown in this setting change designation data is separated with the network segment of other communication port by VLAN, and carry out the setting change of QoS.Specifically, the setting of QoS is changed to, the forwarding of the frame (or frame of sending to this communication port) received via this communication port is carried out on override ground.The result of carrying out above-mentioned VLAN setting is, as shown in phantom in Figure 12, in LAN1A, the network segment under communication terminal 40A is only separated virtually with the network segment under switch hub 50B, communication terminal 40B and 40C, can prevent reliably that audio communication that communication terminal 40A carries out is subject to the obstruction of the data communication that communication terminal 40B or 40C carry out.

As described above, in the present embodiment, if the communication terminal 40 of accommodating in the network had under its command for router 60 in advance and set the priority of the data communication that this communication terminal 40 carries out, the priority level initializing that forwarding of the frame in each switch hub 50 is controlled can automatically change.In the present embodiment, due to for switch hub 50, be associated and pre-stored without setting content of the MAC Address of the communication terminal 40 of the sending/receiving that will carry out voice data and QoS etc., therefore, alleviate the fussy degree of running management personnel's setting operation.That is,, according to present embodiment, can alleviate the corresponding forwarding of the fussy degree of setting operation the priority that makes each switch hub 50 carry out the data communication performed with each communication terminal and control.In addition, in action case discussed above, the priority in LAN1A being controlled and is illustrated, is also identical but control for the priority in LAN1B.

In addition, according to present embodiment, the topological data generated by the neighbouring device information of browsing based on from switch hub 50 and communication terminal 40 loopbacks, thus also can easily grasp the network of network topology that router 60 has under its command.At this, the quantity of the relay that the size of data of the neighbouring device information sent from each switch hub 50 connects with this switch hub 50 is determined, and can't be more than or equal to size of data corresponding to communication port quantity had with this switch hub 50.That is,, for the size of data of the pay(useful) load section of the notification frame in present embodiment, even the quantity of the switch hub 50 that LAN1A comprises increases, can not follow this increase yet and unrestrictedly increase.Therefore, though the LAN1A large-scale, can be because not determining that network topology applies excessive load to LAN1A yet.

And, the every multicast of periodically carrying out claim frame through stipulated time T of the router 60 of present embodiment transmits, therefore, even carried out for example newly connecting switch hub 50(or communication terminal 40) change of such network topology, the multicast of the claim frame of the 2nd time that also can start to count by the connection of the switch hub from new transmits, and generates noncontradictory and correctly mean the topological data of this network topology after changing.That is, according to present embodiment, can avoid applying excessive load to LAN1A, and the change of Sampling network topology without delay.

<B: the 2nd execution mode>

Figure 13 means the block diagram of structure example of the LAN1C of the 2nd execution mode of the present invention.

If contrast Figure 13 and Fig. 1 are clearly known, the difference of LAN1C and LAN1A is, replacement switch hub 50B and have switch hub 500.Switch hub 500 is existing switch hubs, with the difference of switch hub 50, is, the frame of only carrying out the transmission destination-mac address of the frame based on receiving forwards controls (that is, the processing of the step SB190 of Fig. 6).

In LAN1C, be forwarded to the claim frame of switch hub 500 from switch hub 50A, rewrite the forwarding source identifier and just be forwarded to communication terminal 40B and 40C.Therefore, write the MAC Address of switch hub 50A as neighbouring device information in the volatile storage section 444 of communication terminal 40B and 40C.In the same manner, respectively from the priority notification frame of communication terminal 40B and 40C transmission, also rewrite the forwarding source identifier and just by switch hub 500, be forwarded to switch hub 50A.Therefore, in the neighbouring device table of switch hub 50A, the port identifiers of the communication port be connected with switch hub 500 is associated and writes MAC Address some of the MAC Address of communication terminal 40B and communication terminal 40C.Its reason is, respectively from the priority notification frame that communication terminal 40B and 40C send, a side's who first receives forwarding source identifier by after the opposing party's of receiving forwarding source identifier rewrite.

The result of carrying out MAC Address is write to the neighbouring device table according to main points discussed above is, router 60A generates presentation graphs 14(A) or Figure 14 (B) shown in the topological data of network topology.Figure 14 (A) is respectively from the priority notification frame of communication terminal 40B and 40C transmission, switch hub 50A first receives in the latter's situation and the represented network topology of topological data generated, and what Figure 14 (B) illustrated is the represented network topology of topological data generated in the situation that switch hub 50A first receives the former.If Figure 14 (A) or Figure 14 (B) are contrasted with Figure 13, clearly known, in network topology shown in Figure 14 (A) or Figure 14 (B), switch hub 500 does not appear, in addition, be with the difference of the network topology of the reality of LAN1C, only have the one party in communication terminal 40B and 40C.

As mentioned above, in the situation that include existing switch hub in the network that router 60 has under its command, can't grasp this existing switch hub and other devices (, router 60 or switch hub 50, communication terminal 40) annexation, to be connected to existing switch hub on the relevant priority of the data communication carried out of communication terminal also may produce obstacle in controlling.For example, the topological data of the network topology in the situation that generation presentation graphs 14(A), priority control is carried out in the data communication that can't carry out for communication terminal 40C, otherwise, the topological data of the network topology in the situation that generation presentation graphs 14(B), priority control is carried out in the data communication that can't carry out for communication terminal 40B.But, in LAN1C, can grasp the general annexation of router 60 and switch hub 50, carry out priority control for the communication terminal 40 be connected with switch hub 50.

If the switch hub that the network that router 60 has under its command comprises is all existing switch hub, certainly can't grasps the network topology in this network or carry out controlling for the priority of each data communication.But, invent related switch hub 50 if at least comprise 1 playscript with stage directions in a plurality of switch hubs that the network that router 60 has under its command comprises, the annexation that can grasp router 60 and this switch hub 50 by the running management personnel (, the network topology of the summary except common existing switch hub), in addition, the data communication that can carry out for the communication terminal 40 be connected with this switch hub 50 and execution priority are controlled.

<C: distortion>

Above, embodiments of the present invention are illustrated, but certainly this execution mode can be carried out to following distortion.

(1) in the respective embodiments described above, make router 60 with specific time interval periodically multicast transmit for asking to send the claim frame of notification frame, but also can be with the opportunity that is received as of the packet of predetermined regulation kind, and make 60 pairs of claim frames of router carry out the multicast transmission.For example, with the opportunity that is received as of ARP packet, make router 60 send request frame.The new transmission in the network that this situation of ARP packet means that router 60 has under its command connected new communication terminal 40, follows the connection of new communication terminal, and variation may occur network topology, in addition, may need to change frame and forward the priority of controlling.If make router 60 send request frame with new being received as opportunity of ARP packet, without wait, through the stipulated time, can detect the connection of following new communication terminal and the variation of the network topology caused, and, without waiting for the change that can carry out the priority level initializing of frame forwarding control through the afore mentioned rules time.

In addition, in the situation that router 60 has the effect of Dynamic Host Configuration Protocol server concurrently, the packet received for asking the distributing IP address from the communication terminal had under its command of can take is opportunity, and claim frame is carried out to the multicast transmission.And, periodically claim frame carried out the processing of multicast transmission and claim frame carried out to the processing of multicast transmission with the opportunity that is received as of the packet of particular types in the situation that router 60 is carried out with specific time interval, also can when the multicast of at every turn carrying out the latter transmit, using this moment as Fixed Initial Point, remeasure and whether pass through the afore mentioned rules time.For control frame, be also in the same manner, can be on the basis that periodically multicast transmits (or replacing periodic multicast transmission), with the ARP packet or for the opportunity that is received as of the packet of the predetermined regulation kinds such as packet of asking the distributing IP address, and make router 60 carry out the multicast transmission.

(2) in the respective embodiments described above, with the opportunity that is received as of claim frame, make switch hub 50 send the neighbouring device notification frame, but also can periodically make switch hub 50 send the neighbouring device notification frame with specific time interval.For the priority notification frame, also can with specific time interval, periodically make communication terminal 40 be sent in the same manner.In periodically sending the mode of notification frame as mentioned above, without making 60 pairs of claim frames of router carry out the multicast transmission, as long as give the forwarding source identifier in the predetermined part the frame that carries out the multicast transmission from router 60 to the network had under its command, carry out multicast and transmit.

(3), in each above-mentioned execution mode, in each moment that receives claim frame, make each switch hub 50 loopbacks write the neighbouring device notification frame of neighbouring device information list in pay(useful) load section.But, from the N(natural number) till the reception of the claim frame of the reception to the of inferior claim frame N+1 time during in, the storage content of neighbouring device table does not have in vicissitudinous situation, when the claim frame received for the N+1 time for this is responded, also can will be in pay(useful) load section replace the neighbouring device information list and write and mean that the notification frame that the neighbouring device information list does not change the data of this situation carries out loopback.

(4), in each above-mentioned execution mode, pre-determine the kind of the data communication that this communication terminal 40 carries out for each communication terminal 40, and will mean that the priority data of the priority of this data communication writes in non-volatile memories section 442 in advance.But, also can make each communication terminal 40 can carry out polytype data communication, and will mean that the priority data of the priority of executory data communication writes in non-volatile memories section 442.Above-mentioned situation can realize according to following main points.That is, make the multiple signal procedure of each communication terminal 40 storage, and in each communication terminal 40 the pre-stored priority list for above-mentioned each signal procedure is associated with the priority of the data communication of carrying out according to this signal procedure.And, it is opportunity that certain signal procedure is carried out in the indication of take, determine the priority corresponding with this signal procedure with reference to the storage content of above-mentioned priority list, make control part 410 execution will mean that the priority data of this priority writes to the processing in non-volatile memories section 442.

(5), in each above-mentioned execution mode, the multicast that has realized showing significantly the feature of router of the present invention by software transmits to be processed and priority level initializing is controlled and processed.But, certainly can make to realize that multicast transmits the multicast unit of processing and the priority level initializing control unit of execution priority setup control processing is realized by hardware such as electronic circuits respectively.Be also in the same manner for switch hub 50, can forward and control processing, neighbouring device notification frame transmission processing and these processing of priority level initializing change processing by hardware achieve frames such as electronic circuits.

(6) in each above-mentioned execution mode, the priority of urgent audio communication is made as the highest, the priority of common audio communication is made as time high, by the priority of the data communication outside audio communication, be made as minimum.But, such as if the data communication of the large capacity such as uploading the every day that data are carried out to database server and need to carry out at high speed, even the data communication outside audio communication also preferably is made as height by priority certainly.In addition, in the above-described embodiment, the communication port of take has been carried out priority level initializing as unit, but also can take the communication terminal of the end that is positioned at communication path, carries out priority level initializing as unit (that is, take the MAC Address of each communication terminal be unit).In above-mentioned situation, use the MAC Address of the transmission source communication terminal of priority data and this priority data as setting the change designation data, can make switch hub 50 set change according to this setting change designation data execution priority and process.

The Japanese patent application (Patent 2011-066591) of the application based on application on March 24th, 2011,, quote its content as reference here

The explanation of label

1A, 1B, 1C ... LAN, 40A, 40B, 40C, 40D, 40E, 40F ... communication terminal, 50A, 50B, 50C, 500 ... switch hub, 60 ... router, 410 ... control part, 420,510,610 ... communication I/F section, 430 ... user I/F section, 520 ... switching engine section, 440,530,630 ... storage part, 442 ... non-volatile memories section, 444 ... volatile storage section, 620 ... routing engine section, 450 ... bus

Claims (8)

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

This communication system is characterised in that,

Described router has:

The multicast unit, it gives the mailing address of described router in claim frame as forwarding source identifier, and this claim frame is carried out to the multicast transmission to described network, wherein, this claim frame is used for, to described one or more communication terminals, ask respectively transmission to mean that the priority data of the priority of the data communication that this communication terminal carries out has carried out the neighbouring device information of the communicator of frame forwarding to this communication terminal with expression, ask respectively to send the neighbouring device information of this switch hub to described one or more switch hubs; And

The priority level initializing control unit, it receives at least 1 communication terminal from described one or more communication terminals for the described priority of notifying this communication terminal and neighbouring device information and the priority notification frame of loopback, and at least 1 switch hub from described one or more switch hubs for the neighbouring device information of notifying this switch hub the neighbouring device notification frame of loopback, switch hub determining from described router to the communication path of described at least 1 communication terminal for each communication terminal, to the switch hub on each communication path, send the end that is positioned at this communication path communication terminal priority data and mean the information of this communication path, send and carry out the indication of controlling along the forwarding of the frame of this communication path sending/receiving corresponding to the priority shown in this priority data,

Described at least 1 switch hub has:

The neighbouring device table, its storage means to have carried out to described at least 1 switch hub the neighbouring device information of the communicator of frame forwarding;

Frame forwards control unit, it is in the situation that give the forwarding source identifier in the frame that described at least 1 switch hub receives, after in using this forwarding source identifier as neighbouring device information, writing to described neighbouring device table, this forwarding source identifier is rewritten as to the mailing address of described at least 1 switch hub and forwards control corresponding to the transmission target of this frame;

The neighbouring device notification unit, it is in the situation that the frame received is the described request frame, generation writes the neighbouring device notification frame of the neighbouring device information of storing in described neighbouring device table, and the mailing address of described at least 1 switch hub is given as forwarding source identifier and carried out loopback; And

Priority level initializing change unit, the forwarding control mode of the frame in described at least 1 switch hub of its switching, so that carry out the forwarding of the frame of sending/receiving along the communication path shown in the information received from described router, control, according to the priority shown in the priority data received together with this information, carry out

Described at least 1 communication terminal has:

The neighbouring device information memory cell, it is stored the forwarding source identifier of giving in this claim frame with the opportunity that is received as of described request frame as the neighbouring device information of described at least 1 communication terminal; And

The priority notification unit, in the described priority notification frame of the neighbouring device information of its priority data in the priority that writes the data communication that means that described at least 1 communication terminal carries out and described at least 1 communication terminal, give the mailing address of described at least 1 communication terminal as forwarding source identifier, and carry out loopback.

2. communication system according to claim 1, is characterized in that,

Described priority level initializing change unit is corresponding to the priority data received from described router, switching QoS(Quality of Service) set and VLAN(Virtual Local Area Network) at least one setting in setting.

3. communication system according to claim 1 and 2, is characterized in that,

Described priority level initializing change unit is in the situation that receive and will be positioned at the communication terminal of end of the communication path shown in the information received from described router as the frame of transmission source, rewrite the head of this packet, control so that write to the package forward in the 3rd layer of OSI Reference Model of the packet in the pay(useful) load section of this frame, carry out corresponding to the priority shown in this priority data.

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

This router is characterised in that to have:

The multicast unit, it gives the mailing address of described router in claim frame as forwarding source identifier, and this claim frame is carried out to the multicast transmission to described network, wherein, this claim frame is used for, ask respectively to send the neighbouring device information that means to have carried out to this switch hub the communicator of frame forwarding to described one or more switch hubs, the priority data of the priority of the data communication of to described one or more communication terminals, asking respectively this communication terminal of transmission expression to carry out and the neighbouring device information of this communication terminal; And

The priority level initializing control unit, it receives at least 1 communication terminal from described one or more communication terminals for the described priority of notifying this communication terminal and neighbouring device information and the priority notification frame of loopback, and at least 1 switch hub from described one or more switch hubs for the neighbouring device information of notifying this switch hub the neighbouring device notification frame of loopback, switch hub determining from described router to the communication path of described at least 1 communication terminal for each communication terminal, to the switch hub on each communication path, send the end that is positioned at this communication path communication terminal priority data and mean the information of this communication path, send and carry out the indication of controlling along the forwarding of the frame of this communication path sending/receiving corresponding to the priority shown in this priority data.

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 in that to have:

The neighbouring device table, it is to meaning that the neighbouring device information of having carried out the communicator of frame forwarding to described switch hub is stored;

Frame forwards control unit, it is in the situation that given the forwarding source identifier in this received frame, after in using this forwarding source identifier as neighbouring device information, writing to described neighbouring device table, this forwarding source identifier is rewritten as to the mailing address of described switch hub and forwards control corresponding to the transmission target of this frame;

The neighbouring device notification unit, it is in the situation that the frame received is to have forwarded the neighbouring device information of communicator of frame and the claim frame that sends from described router in order to ask send to mean to this switch hub, generation writes the neighbouring device notification frame of the neighbouring device information of storing in described neighbouring device table, and the mailing address of described switch hub is given as forwarding source identifier and carried out loopback; And

Priority level initializing change unit, it switches the forwarding control mode of the frame in this switch hub, control so that carry out the forwarding of the frame of sending/receiving along the communication path shown in the information received from described router, carry out according to the priority shown in the priority data received together with this information.

6. a communication means, it is for router, this router will comprise one or more switch hubs and respectively with some one or more communication terminals that are connected of described one or more switch hubs at the interior network that has under its command, with other networks, be connected,

This communication means is characterised in that,

Give the mailing address of described router as forwarding source identifier in claim frame, and this claim frame is carried out to the multicast transmission to described network, wherein, this claim frame is used for, ask respectively to send the neighbouring device information that means to have carried out to this switch hub the communicator of frame forwarding to described one or more switch hubs, the priority data of the priority of the data communication of to described one or more communication terminals, asking respectively this communication terminal of transmission expression to carry out and the neighbouring device information of this communication terminal

At least 1 communication terminal of reception from described one or more communication terminals is for the described priority of notifying this communication terminal and neighbouring device information and the priority notification frame of loopback, and at least 1 switch hub from one or more switch hubs for the neighbouring device information of notifying this switch hub the neighbouring device notification frame of loopback, switch hub determining from this router to the communication path of described at least 1 communication terminal for each communication terminal, to the switch hub on each communication path, send the end that is positioned at this communication path communication terminal priority data and mean the information of this communication path, send and carry out the indication of controlling along the forwarding of the frame of this communication path sending/receiving corresponding to the priority shown in this priority data.

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

This communication means is characterised in that,

Forward source identifier in the situation that give in the frame received, after writing in the neighbouring device table using this forwarding source identifier as neighbouring device information, this forwarding source identifier is rewritten as to the mailing address of described switch hub and forwards control corresponding to the transmission target of this frame

In the situation that the frame received is to have forwarded the neighbouring device information of communicator of frame and the claim frame that sends from described router in order to ask send to mean to this switch hub, generation writes the neighbouring device notification frame of the neighbouring device information of storing in described neighbouring device table, the mailing address of described switch hub is given as forwarding source identifier and carried out loopback

Switch the forwarding control mode of the frame in this switch hub, control so that carry out the forwarding of the frame of sending/receiving along the communication path shown in the information received from described router, carry out according to the priority shown in the priority data received together with this information.

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

This communication means is characterised in that,

From described router, give the mailing address of described router as forwarding source identifier in claim frame, and this claim frame is carried out to the multicast transmission to described network, wherein, this claim frame is used for, to described one or more communication terminals, ask respectively transmission to mean the priority data and the neighbouring device information that means to have carried out to this communication terminal the communicator of frame forwarding of the priority of the data communication that this communication terminal carries out, ask respectively to send the neighbouring device information of this switch hub to described one or more switch hubs

Forward source identifier in the situation that give in the frame that at least 1 switch hub in described one or more switch hubs receives, after writing in the neighbouring device table using this forwarding source identifier as neighbouring device information, this forwarding source identifier is rewritten as to the mailing address of described at least 1 switch hub and forwards control corresponding to the transmission target of this frame

In the situation that the received frame of described at least 1 switch hub is the described request frame sent from described router, generation writes the neighbouring device notification frame of the neighbouring device information of storing in described neighbouring device table, the mailing address of described at least 1 switch hub is given as forwarding source identifier and carried out loopback to described router

At least 1 communication terminal in described one or more communication terminals, the described request frame received from described router transmission of take is opportunity, the forwarding source identifier of giving in this claim frame is stored as the neighbouring device information of described at least 1 communication terminal

In the priority notification frame of the neighbouring device information of the priority data of the priority that writes the data communication that means that described at least 1 communication terminal carries out and described at least 1 communication terminal, give the mailing address of described at least 1 communication terminal as forwarding source identifier, 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 the described neighbouring device notification frame of described at least 1 switch hub loopback, switch hub determining from described router to the communication path of described at least 1 communication terminal for each communication terminal, switch hub on each communication path sends setting change indication frame, the priority data of the communication terminal that this setting change indication frame comprises the end that is positioned at this communication path and the information of this communication path of expression

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

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