TW201218685A - Communication apparatus, communication system and route switching method - Google Patents

Abstract

A communication apparatus (1), between which and an opposed communication apparatus a current communication route and a backup communication route are provided, having a switching control section (13), which determines whether a selected route is crowed based on a traffic amount when one of the communication routes is selected as the selected route and a data transmission is performed via the selected route, selects a part of the transmitted data as a data-to-be-switched if the selected route is determined as being crowed, and switches the transmission route of the data to be switched to a communication route other than the selected route, is provided.

Description

201218685 VI. Description of the Invention: [Technical Field] The present invention relates to a communication device for pre-setting a point-to-p〇int active system and a preparatory system between two devices with a communication partner And a path switching method in the communication device. [Prior Art] As a technique for preventing communication interruption in a case where an interference occurs in a communication path when performing communication between two devices, there is a technique of: redundancy of an End-to-End connection between two devices, and When there is an obstacle, it will automatically switch to the protection system (protecti〇n) switching technology of the preparatory system path. For example, in the linear protection switching technology defined by the ITU-I (Internati〇nal Telecommunication Union Telecommunication Standardization Sector) G. 8〇31, it is preset to correspond to Ethernet (Ethernet, Registered trademark) 2 channels between the existing system and the standby system, and automatically switch to the standby system path when the active system path is faulty. By using such a linear protection switching technique, it is possible to switch paths and continue communication even in the case where communication between the two devices is hindered. As a conventional technique for implementing linear protection switching, for example, in the following Patent Document 1, there is disclosed a path protection method capable of improving switching efficiency. In this method, it is possible to specify/control the order of switching to the standby system for each traffic, in the case where the failure detection of somewhere is taken as the 'driver' and there are a plurality of traffic to be switched. Patent Document 1: Japanese Laid-Open Patent Publication No. 2007-181010 No. 322773 3 201218685 SUMMARY OF INVENTION [Problems to be Solved by the Invention] However, 'in the linear protection switching technique specified in the above-mentioned ITU-T Recommendation G. 8031' The obstacle detection or switching operation instruction is an opportunity, and the VLAN (Virtual Local Area Network) set as the switching target is switched to the standby system path. Therefore, even in the case where the active system path is mixed and the frame loss actually occurs, there is a problem that the priority order (priority: also referred to as priority, referred to herein as priority order) is high. The traffic is switched to the standby system path when the obstacle is detected, and even if the obstacle occurs due to the mismatch, a temporary communication interruption occurs due to the obstacle. There is also the possibility of preventing the loss of frames due to confounding. In the above method of the patent document VTA — ^w milk 1 π圮, the plurality of two are grouped' and by detecting the switching order in advance for each group, and detecting the obstacle, In the set switching sequence, the method of switching the barrier load is implemented, and the triggering action is also the same as the line defined by the above-mentioned curry recommendation G•face. The technology will be the same: there will be temporary due to obstacles. Communication, and the inability to prevent the loss of frames due to confounding. = (10) In view of the above-mentioned circumstances, the purpose of the development is that the service piece will not be prioritized, and the communication can be reduced (the track device, communication system and path switching method for solving the problem. 322773 4 201218685 In order to solve the above problems,

One of the paths is used as the selection path, and in the case of using the data transmission, the foregoing selection path is determined and the selection path is used.

(Effect of the Invention) The communication device, the communication system, and the path switching method of the present invention can obtain an effect of reducing communication interruption in use without causing communication interruption of a traffic with a high priority. [Embodiment] Hereinafter, embodiments of a communication device, a communication system, and a path switching method according to the present invention will be described in detail based on the drawings. Further, the invention is not limited by the embodiment. Embodiment 1. Fig. 1 is a schematic view showing a configuration example of the first embodiment of the communication system of the present invention. As shown in the figure, the communication system of the present embodiment includes a communication device 1 and a communication device 2 having a linear protection switching function defined by ITU-T G.8031, and communication paths 3 and 4. The communication paths 3, 4' are communication paths set for communication between the communication device 1 and the communication device 2, and the communication path 3 is regarded as the active system path, and the communication path 322773 5 201218685 is regarded as the standby system path. The communication flow from the communication device 1 to the communication device 2 is transmitted using one of the communication path 3 and the communication path 4. When the communication device i and the communication device 2 are directly adjacent to each other, the communication path 3 and the communication path 4 are respectively a single bond. However, in the present embodiment, whether or not the communication paths 3 and 4 are single links is not used. Further, a plurality of VUNs are set between the communication device 1 and the communication device 2. Further, in the present embodiment, it is assumed that the reciprocation of the transmission path is the same path, and the communication system that determines the transmission path on the transmission origin side is assumed. Therefore, as long as the communication device 1 as the transmission originating device determines the path of the transmission destination, the communication device 2 of the transmission destination can obtain the information to be transmitted by any of the communication paths 3 and 4 even if the communication device 2 of the transmission destination is not obtained beforehand. A predetermined reception process is performed on the traffic input by one of the communication paths 3, 4. When the communication from the communication device 2 to the communication device 1 is performed, the communication device 2 of the transmission destination is configured in the same manner as the communication device 1 of the present embodiment, and the communication device 2 performs the communication described below. The action of the device 1 is sufficient. Fig. 2 is a view showing an example of the functional configuration of the communication device 1 of the present embodiment. As shown in Fig. 2, the communication device 1 is composed of a communication interface 11, a transmission processing unit 12, a switching control unit 13, an obstacle monitoring unit 14, a traffic flow measuring unit 15, and a communication interface 16. The communication device 1 of the present embodiment performs the following switching operations: by implementing the linear protection switching function 6 322773 201218685 2 defined by ITU-T G. 8031, when the obstacle is changed, the obstacle is switched, and In the case where the path of the transmission destination is not mixed, the path switching of the switching path is not performed. The through hole interface 11' is provided with ports 21-1 to .21-5, and performs predetermined reception processing on the signals input from the ports 2H to 21-5, and outputs the processed services. To the transmission processing unit 12. The communication interface 11 corresponds to, for example, the link speed of i〇Mbps/1〇〇Mbps/lGbps used by Ethernet (registered trademark), and the flow rate measurement and obstacle detection of the traffic received by each port. The communication interface 16 is provided with ports my to 22_5, performs predetermined transmission processing on the traffic output from the transmission processing unit 12, and outputs the processed messages from the ports 22-1 to 22-5. The communication interface 16 corresponds to, for example, a link speed of 1 Mbps/1 Mbps/1 Gbps used by Ethernet (registered trademark), and can perform flow measurement and obstacle detection of traffic transmitted by each port. In addition, in the second picture, the communication interface and the communication interface 16 have five ports, but the number of the ports is not limited thereto, and the number of ports of the communication interface 11 and the communication interface 16 are different. A few can be. In addition, although the communication interface U is used as the communication interface on the input side, and the communication interface 16 is used as the communication interface on the output side, the communication interface 11 and the communication interface 16 may both have an input side. And the function of the communication interface on both sides of the output side. The transmission processing unit 12' maintains the transmission destination of the communication with respect to the VLAN identifier of the received service (or each identifier and priority order) (port 22-1 to port 22) The correspondence between -5 of one of the ports) 7 322773 201218685 is used as the transmission rule, and the transmission process is performed according to the transmission rule. The switching control unit 13 maintains the usage path information, updates the usage path information according to the obstacle information or the traffic flow information, and instructs the transmission processing unit 12 to rewrite the routing rule according to the usage path information, wherein the usage path information is The method includes: a vlan identifier of the VLan which is the object of the switching when the hybrid is used; and information for identifying whether to use the path of the active system path and the preparatory system path to transmit the traffic corresponding to the vlan identifier. The traffic flow measuring unit 15 collects the measurement results of the traffic flows of the ports 22-1 to 22-5 of the communication interface 16, and monitors whether the traffic flow has exceeded the threshold value, and detects that the traffic flow has been detected. When the threshold exceeds the threshold, the number and traffic flow of the port are notified to the switching control unit 13, and the predetermined threshold value is notified to the switching control unit 13. Further, the traffic flow measuring unit 15' is previously acquired from the switching control unit 13 and holds the threshold corresponding to each of the ports 22-1 to 22-5. The obstacle monitoring unit 14 detects occurrence and recovery of an obstacle of each of the ports 22-1 to 22-5 of the communication interface 16, and transmits the detected case (obstacle detection or recovery) to the switching control unit 13. In addition, the detection of obstacle occurrences and recovery 'can also be performed for each mouth' can also be performed for each vlan. For the detection method of the occurrence and recovery of obstacles, the ETH-CC (ETHernet (registered trademark) continuity check) function specified in ITU-T Recommendation Y. 1731 can be used, and other methods can be used. Next, the operation of the hybrid time switching in the present embodiment will be described. Fig. 3 is a view showing an example of the use path information held by the switching control unit 13 322773 201218685. As shown in Figure 3, in the usage path information, for each VLAN identifier, the port number of the active system is included (the figure is 5 is the active system), the threshold, the highest priority, and the preparation system. The port number (abbreviated as the standby system in the figure), the selection system (the system that is currently selected. The active system path is selected as the transmission path or the information of the preparatory system path is selected as the transmission path). In addition, the 帛3 diagram is an example, and information other than the one shown in Fig. 3 can be held as long as the same information is maintained. The port number of the current system is the identification number of the mouth (the one of the ports 21-1 to 21 to 5) of the traffic transmission destination. For example, the ports 21-1, 22-2, ..., 21-5 correspond to the port numbers #1, ..., #5, respectively. The port of the transmission destination corresponds to the transmission path; the port number of the active system shows the port number of the transmission to the active system path. Similarly, the port number of the standby system is the number of the port that is displayed when it is transferred to the path of the standby system. In the present embodiment, the switching control unit 13' switches the path of the traffic between the active system and the standby system for each VLAN identifier and priority order according to the VLAN identifier and the priority order information of the Ethernet (registered trademark) frame. , switch as a hybrid. That is, in the present embodiment, even if the traffic of the same VLAN identifier is different in the priority order, the traffic is identified for each priority, and the switching is performed for each priority. For example, the traffic of the priority order a of the same VLAN identifier and the priority order B (A off B) are identified, and the traffic of the priority order A and the priority order B are respectively transmitted to different transmission paths. . The threshold value shown in Fig. 3 is set by the traffic flow measurement unit 15 to determine whether or not the threshold value is 322773 9 201218685. Although the threshold value can be set, for example, it is conceivable to set the threshold value to a smaller value in the VLAN ' of the communication of the application software which is more strict in delay. The switching control unit 13' obtains the minimum threshold value for each itching according to the use route information', and previously notifies the threshold value traffic flow measuring unit 15 as the threshold value of each port. The highest priority order shown in Figure 3 is the highest priority that is switched when the traffic flow has exceeded the threshold of the VLAN. The switching control unit 13 determines the VLAN ' of the traffic flow exceeding the threshold based on the port number and the traffic flow notified from the traffic flow measurement unit 15, and the highest priority is below the traffic for the VLAN. The transmission path of the priority traffic is switched to a communication path other than the selection system. In addition, in the case of a traffic of a VLAN whose traffic has exceeded the threshold, the transmission path of the priority traffic exceeding the highest priority is kept unchanged. Generally, the priority of the high-priority traffic is stricter on the communication interruption. In the present embodiment, the routing path of the traffic below a certain priority order (the highest priority order) is switched to the communication path other than the selection system, thereby preventing the communication interruption of the high priority order communication side. Eliminate the complexity of the selection system. In addition, here, the value of the priority order is larger, and the priority is higher. In addition, here, the traffic flow measurement unit 15 is notified of the switching control unit 13' when the traffic flow has exceeded the threshold of each port, but the traffic flow is The notification method is not limited to this. For example, the traffic flow measuring unit 15 may notify the switching control unit 13 of the port number and the traffic flow periodically without the threshold. 10 322773 201218685 In this embodiment, in order to determine the priority of the traffic, for example, use the priority information stored in the VLAN tag in the Ethernet (registered trademark) frame (PCP: pri〇rity c〇de p 〇int : priority code point). Fig. 4 to Fig. 7 are diagrams showing an example of the use of priority order information for judging the priority order of the traffic. Figure 4 is a diagram showing the composition of the Ethernet (registered trademark) frame. The Ethernet (§ main register) frame contains j) A (Destination Address) / SA (Source Address: Source Bit) Address), the type of display frame, and TCI (Tag Control)

Information: Information on the label control information). In the case of Type "81-00", the C-TAG TCI (Customer VLAN Tag Control Information) is used as the TCI; in the case of the Type 88-a8, the S-TAG TCI (Service) is used. VLAN Tag Control Information: Service VLAN tag control information) or B-TAG TCI (Backbone VLAN Tag Control Information) as TCI; in the case of Type "88-e7", use I-TAG TCI ( Backbone Service Instance VLAN Tag Control Information: The backbone service entity VLAN tag control information) as the TCI. Fig. 5 is a schematic view showing a configuration example of the C-TAG TCI. As shown in Figure 5, the C-TAG TCI includes PCP, CFI (Canonical Format Indicator), and VID (VLAN Identifier). In the case where the frame contains the C-TAG TCI, the PCP is used as the priority information and the priority order of each service is determined. 322773 201218685 Fig. 6 is a diagram showing a configuration example of S-TAG TCI and B-TAG TCI. As shown in Fig. 6, S-TAG TCI and B-TAG TCI include PCP, DEI (Drop El igible Indicator), and VID. When the frame contains S-TAG TCI or B-TAG TCI, the PCP is used as the priority information and the priority of each service is determined. Fig. 7 is a schematic view showing a configuration example of the I-TAG TCI. As shown in Figure 7, 'I-TAG TCI, including I-PCP, I-DEI, UCA (Use Customer Address), l_SID (Backbone Service Instance Identifier), C-DA (Encapsulated Customer Destination Address) and C-SA (Encapsulated Customer Source Address). In the case where the frame contains the i-TAG TCI, the IPCP is used as the priority information and the priority order of each service is determined. Further, the priority order information described above is an example, and is not limited thereto, and other information may be used as the priority order information. Fig. 8 is a view showing an example of an active system path and a preliminary system path of each of the traffic using the route information illustrated in Fig. 3. The traffic 31 of Figure 8 shows the traffic with the VLAN identifier #5; the traffic 32 shows the traffic with the VLAN identifier #7; the traffic 33 shows the message with the VLAN identifier #10. Business. Further, the solid line in Fig. 8 shows the active system, and the dotted line shows the preparatory system. As shown in Fig. 8, for example, the communication device 1 is a traffic 31 that has a VLAN ID of #5, and transmits to the port #2' when the active system path is selected, and the standby system is selected. The condition of the path is transmitted to the port 12 322773 201218685 In the example of Fig. 3, since the VLAN identifier is the system of selection, it is the active system' so the traffic 31 is transmitted to the port #2. In addition, there is no VLAN in the selection system (the traffic does not exceed the threshold), and all the priority messages are transmitted to the gateway corresponding to the selection system. Therefore, in the transmission processing 12, there is no miscellaneous VLM in the selection system. Although it is only necessary to maintain the correspondence between the identifier of the _ and the destination of the transmission destination as a transmission rule, there is a miscellaneous in the selection system. In the case of 1 VLAN, the information of the transmission destination is maintained for the priority information. The transmission processing unit 12 rewrites the transmission rule β based on the private control from the switching control 砟1 «3. Fig. 9 is a flowchart showing the procedure of the path switching processing in the present embodiment. First, the 'switching control unit 13' determines whether or not the monitoring has been performed from the obstacle. Ρ 14 receives the notification of the obstacle detection (step (1). When the notification of the obstacle detection has been received from the obstacle-aged view unit 14 (the step "si is based on the material" (4), the obstacle port is detected ( V The mouth is used as the VUN of the preparatory system or the active system. For example, 'when the use of the route information exemplified in Fig. 3 is maintained, when the winter is detected by the bee port #2, it is discriminated The vu field of the heart and the VLAN #7. Next, the switching control unit 13 determines whether there is an unprocessed VUN among the determined VUNs (the following steps S4 to S7 are not performed) vlan (step S3), and there is no In the case of the processed VLAN (No in step S3), the process returns to step S1. In the case of an unprocessed VLAN (step 322773 13 201218685 "Yes"), it is for unprocessed VLAN (unprocessed) If there is a plurality of VLANs, it is one of the VLANs, and it is determined whether the obstacle notified in step S1 is an obstacle corresponding to the transmission path of the standby system corresponding to the VLAN (step S4). In step S4, it is determined. For the transmission path pair with the preparatory system In the case of the obstacle (YES in step S4), the switching control unit 13 updates the use path information by using the selection system of the VLAN as the active system (step S5), and the transmission destination of the VLAN is regarded as corresponding. The transmission processing unit 12 instructs the transmission processing unit 12 to rewrite the transmission path in the mouth of the active system path, and the transmission processing unit 12 rewrites the transmission rule according to the instruction (step S7), and returns to step S3. In step S4, it is determined that the transmission processing unit is not In the case of an obstacle corresponding to the transmission path of the preparatory system (NO in step S4), the switching control unit 13 updates the usage path information by using the selection system of the VLAN as a standby system, and transmits the transmission destination of the VLAN. The transmission processing unit 12 instructs the transmission processing unit 12 to rewrite the transmission path in response to the opening of the standby system path, and the transmission processing unit 12 rewrites the transmission rule according to the instruction (step S7), and returns to step S3. The processing (the processing of step S1 to step S7) is the same as the conventional one, for example, the same as ITU-T recommendation G. 8031. Further, the processing of the obstacle recovery is also performed. The same operation is performed in the ITU-T recommendation G. 8031. On the other hand, in step S1, it is determined that the notification of the obstacle detection has not been received from the obstacle monitoring unit 14 (NO in step S1), and cut 14 322773 201218685 The switching control unit 13 determines that k is notified from the traffic flow buffer unit 15 that the traffic flow exceeding the threshold value is "number (whether or not the threshold value is exceeded) (step S9), and is not notified (four) After the value of the traffic flow and the port number ("No" in step S9), the process returns to step Sb. In step S9, the traffic flow and the port number that have been notified that the threshold has been exceeded are determined. In the case (step S9 < U 1 (4) _ 13, the VLAN having exceeded the threshold value is judged based on the notified traffic flow rate and the port number and the use path information (step s1). The change control unit 13 judges whether or not there is unprocessed among the (10) determined in the step s1 (the following steps si2 to s(4) are not performed (step S11), and there is no unprocessed VUN. (No in step su) "Return to step si. If there is an unprocessed VLM ("YES" in step sii), the switching control unit 13 has a plurality of unprocessed VLANs that are unprocessed. The case is any one of the VLMs, and it is judged based on the use path information whether or not the mouth of the selection system corresponding to the VUN exceeds the threshold (step S12). For example, the usage path information shown in Fig. 3 can be maintained, and the traffic volume of 8〇% of the physical bandwidth can be measured at the port #2. In this case, for the use of the current system, port #2 is selected as the selection system, and the threshold is set to 60% of VLAN #5; and the current system is used as the selection system, and the threshold is set to 8 〇% of VUN#7, judge that the port corresponding to the VLAN selection system exceeds the threshold. In step S12, it is determined that the port corresponding to the selection system of the VLAN does not exceed the threshold (NO in step S12), and the process returns to step SU. In step S12+, it is determined that the port corresponding to the selection system 322773 15 201218685 exceeds the threshold ("YES" in step S12), and the highest priority of the VLAN is obtained according to the use path information, and A transmission rule for transmitting the traffic of the highest priority order or less to the non-selection system is generated (step S13). Then, the transmission processing unit 12 is instructed to update to the transmission rule 'after the transmission of the transmission rule', and the transmission processing unit 12 updates the transmission rule in accordance with the instruction (step S14). In the case where the usage path information shown in FIG. 3 can be maintained, for example, when the traffic flow of 80% of the physical bandwidth is measured at the port #2, it is determined in step S13 that the VLAN #5 exceeds the threshold value, and In step S14, a transmission rule is generated in such a manner that the traffic corresponding to the highest priority of the highest priority of the VLAN #5 is transmitted to the port #4 of the standby system. As described above, in the present embodiment, the traffic below a certain priority is switched to the path of the non-selected system for the VLAN in which the traffic of the selected system has exceeded the threshold. Therefore, the traffic of the higher priority order is not adversely affected by the communication interruption caused by the handover, and the traffic of the selected system can be suppressed to be low. In addition, in the case of switching between the above-mentioned hybrids, when the monitoring operation of the traffic flow continues, and the congestion of the port 21_丨 to 21-5 after the threshold is exceeded, the traffic flow becomes predetermined. In the case of a value below the value, it is also possible to reset to the state before the switching at the time of the miscellaneous (the traffic that has been transmitted as the selection system in the path of the hybrid system before the handover). Further, in the present embodiment, the switching control unit 13 has a function of judging whether or not the selection of the system diameter is mixed, but the hybrid determination means and the switching control unit 13 can be separately provided. In the case of 322773 16 201218685 S1 to the step, the hybrid determination means performs the processing of the small step S12 based on the use of the route information, and the switching control unit 13 performs the processing of steps S13 and S14 based on the use of the route information. In addition, although it is assumed that the priority is higher, the requirement for communication interruption is stricter, and the traffic below a certain priority is switched to the non-selection system for the VLAN in which the traffic of the selected system has exceeded the threshold. The path 'but, for example, in the track with lower premiums, there is also a wire that is more secretive for communication breaks. In order to make such a material, the needle sets a threshold for each-priority order and determines whether or not to perform the switching. Fig. 10 is a diagram showing an example of the use path information for the case where the threshold value is set for each priority order. 4fe. /- A Next figure. In the case of setting the threshold for the parent-priority order, for example, as shown in Fig. 10, for each vlan and the priority order, the 埠σ number, the threshold value, and the reserve system are used. The number, and the information of the selection system, and in step S10, are combined with the VLM and the priority order that exceed the threshold. Then, the subsequent steps su to step 4 are performed for each VLAN and a combination of priority orders. Further, the method of judging the switching using the highest priority order illustrated in Fig. 3 may be considered as an example of the method of performing the switching for each of the preceding positions. For example, 'the entry that prioritizes the priority of the VLAN and the highest priority order, as the use of the road technology information in the form shown in the first () diagram, and the difference; The same movement as (4) the highest priority is also in the case of the selection of the system. In the case of the selection system, the priority is used to assign the traffic to the selection (four) and the road of the H system 322773 17 201218685 Trail' However, it is not limited to this, and it is also possible to allocate traffic using a reference other than the priority order. Further, in the present embodiment, the path switching is performed in accordance with the priority order of the traffic when the selection system is mixed. However, the path switching using the priority order may be performed when the obstacle occurs. For example, in the case of maintaining the usage path information shown in FIG. 3, when an obstacle occurs in the path of the active system, the data of the traffic below the highest priority is not transmitted, and the data is discarded, and the highest priority is exceeded. The coordinated traffic is transmitted to the path of the standby system. Specifically, when the selection system is selected as the standby system in step S6 of FIG. 9, the traffic exceeding the highest priority order is switched to the path of the standby system, and the data of the traffic below the highest priority order is discarded. The way to generate transmission rules. In this way, a path with a low communication capacity can be used in the communication path of the standby system. Further, in the case of performing both of the above-described mismatching and the switching of the priority order when the obstacle occurs, the highest priority order corresponding to each can be individually set. Further, in the present embodiment, it is judged whether or not the selection system is mixed based on the traffic flow rate of each port. However, when it is possible to detect the occurrence of the miscellaneous by other means such as detection of the delay time, it is also possible to borrow It is judged by other means whether it is mixed. Further, in the present embodiment, the case where a plurality of VLANs are set is exemplified. However, if the two communication paths of the active system and the standby system are set, the hybrid time switching method of the present embodiment can be applied. In a communication system where no VLAN is set. In this case, because of the priority information, the value of the VLAN tag cannot be used, so the priority information of the other 18 322773 201218685 is used to select the switch to switch the path to the non-selected system. Further, in the case where two or more paths are set in advance, the hybrid time switching method of the present embodiment can also be applied. In this case, although there are a plurality of paths other than the selected system, one path may be used as the transmission path of the traffic with the highest priority or less, or two or more paths may be the highest priority. In the following embodiment, the switching control unit 13 maintains the threshold corresponding to the traffic flow of the selected system for each VLAN and the case where the threshold is exceeded. The usage path information of the priority order switched to the non-selected system is stored, and the path switching is indicated according to the usage path information and the traffic flow of each port, and the transmission processing unit 12 follows the path switching indication after the switching. Transfer in the path. Therefore, it is possible to reduce the confusion of the selected system path (the path in use) without interrupting the communication of the priority traffic. Embodiment 2. Next, the path switching method according to the second embodiment of the present embodiment will be described. The configuration of the communication system of this embodiment is the same as that of the first embodiment. Further, the configuration of the communication device 1 of the present embodiment is the same as that of the first embodiment. The constituent elements having the same functions as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and the description thereof will be omitted. In the first embodiment, a path switching method for one-way communication from the communication device 1 to the communication device 2 has been described. In the present embodiment, when the two-way communication from the communication device 1 to the communication device 2 and from the communication device 322773 19 201218685 2 to the communication device 1 is performed, the same path is used in both directions (indicating direction) Explain the case for the opposite). In the present embodiment, the communication device 2 has the same configuration as that of the communication device 1. Further, in the case of bidirectional communication, in the case where the path is set for each direction, the operation of the first embodiment may be performed by the communication device 1 and the communication device 2, respectively. In the case where the same path is used in both directions, when the communication device 1 switches the path, it is necessary to notify the communication device 2 of the VLAN after the switching path and the priority order. Then, the "passing device" 2 sets a path for transmitting data to the communication device 1 in accordance with the notification. Although the notification method may be any method, the following description will be made by taking, for example, the case of using the APS (Automatic Protection Switching) protocol defined by ITU-T G.8031. Fig. 11 is a diagram showing an example of a configuration of an APS protocol message (APS message) format. Figure 12 is a diagram showing the information contained in the data format of the APS Agreement. As shown in Figure 11, the data used by the APS protocol includes Request/State, Protection Type, Requested Signal, and Bridged Signal. ). Fig. 12 is a view showing the values and meanings of the items of the APS message format shown in Fig. 11. Fig. 13 is a sequence diagram showing an example of a path switching sequence in the case of using an APS message. In Fig. 13, the switching sequence at the time of occurrence of the obstacle is shown, which is the same as the conventional linear protection switching technique.

The NR in Fig. 13 shows that the APS message of NR 20 322773 201218685 (No Request: not required) is set in the Request/State; and the SF shows that the SF (Signal Fail) is set in the Request/State. APS message. Also, r/b is a short name for Request/Bridged Signal. In Fig. 13, an example of two-way communication between the two communication devices of WEST and EAST is shown. The WEST and EAST systems have the same configuration as the communication device 1 shown in the first embodiment. However, in the first embodiment, the switching of the path at the time of transmission is controlled. In contrast, in the present embodiment, since the same path is used in both directions, the reception path is also changed when the transmission path is changed. change. In the present embodiment, the communication interface 16 has a transmission/reception function, and the switching control unit 13 also controls the switching of the reception path (which terminal is received from the communication interface 16), and performs the path after the selection. The method of receiving generates a transmission rule. The SEL of Fig. 13 shows the state of the selector (select〇r) for switching the path for reception between the active system and the standby system; wherein the white part shows the state received from the active system; Displays the status received from the standby system. BRG is the state of the bridge (丨dge) that switches the path for transmission between the active system and the standby system; the white 邠 line shows the status sent to the active system; the full part is displayed and sent to the standby system. State. Further, the SEL and BRG displayed on the left side show the state of WEST; the sel and BRG displayed on the right side show the state of EAST. Here, the switching control unit 13 performs the Aps protocol processing. That is, the handover control unit 13 performs processing (handover processing, etc.) in accordance with the generation of the APS message and the APS protocol when the APS message is received. Further, the generated APS message of 322773 201218685 is transmitted via the transmission processing unit 12 and the communication interface, and is received by the switching control unit 13 via the transmission processing unit 12 and the communication interface.

In the initial state of Fig. 13, the communication path of the active system is used in both directions from the WEST to the EAST direction and from the EAST to the WEST direction. The WEST and EAST are respectively transmitting regular APS messages to the counterpart device (APS periodically) (steps S21 and S22). In the case where the communication path of the active system is used without an obstacle, WEST and EAST send an NR (r/b=null) message indicating that no transmission or reception is made in the standby system. The NR (r/b= null) message is set to NR for Request/State, and the Request and Bridged Signal are respectively set to the APS message of Null Signal. Secondly, it is assumed that the communication path of the active system is interrupted by one-way communication (from the direction of WEST to EAST). When detecting the communication interruption, the EAST switches the path of the local office (the path of transmission and reception) to the standby system, and transmits an APS message (step S23). The APS message is transmitted as an external (r/b=normal) message indicating that a Signal Fail is detected and transmitted and received by the preparatory system (step S24). The SF(r/b=normal) message sets the SF for Request/State and will request and Bridged

Signal is set to the APS message of Normal Traffic Signal. The WEST system transmits an NR (r/b=null) message as a regular transmission even after detecting that the EAST is a one-way communication interruption (step S25). Then, when receiving the SF (r/b=n〇rmai) message, WEST switches the transmission and reception path of the local office to the standby system (step S26). Then, the WEST system sends the display NR (r/b=, which is the N〇Request (the communication interruption is not detected in this office), but it is still transmitted and received in the standby system according to the requirements from the opposite device (EAST). Normal) message (step S27). The WEST transmits an NR (r/b=norma 1) message in the subsequent APS periodic transmission (step S29). Further, EAST transmits a SF (r/b = normal) message as a regular transmission of the APS (steps S28, S30). Further, for the Protection Type in the APS message used in the above processing, the value according to the switching method set in the communication system is set. In the present embodiment, since the two-way communication (communication requiring mutual agreement with the path of the opposite device) is assumed, the Protection Type sets the value corresponding to the two-way communication. Further, since the path switching is performed for each VLAN, the above steps S21 to S30 are performed for each VLAN. Next, the route switching at the time of mixing in the present embodiment will be described. In the present embodiment, since the communication device 1 on the transmitting side selects a route for each traffic based on the priority order information as in the first embodiment, as in the first embodiment, the communication device 1 is also placed in the opposite direction. The transmission route is switched in such a way that the traffic becomes the same road control: (the direction is opposite). Therefore, in the present embodiment, the switching control 13 of the communication device 1 notifies the opposite path using the priority order information as the reference for switching to the opposite device. Here, a case where the communication device 1 performs communication with the communication device 2 as shown in Fig. 1 will be exemplified. In the present embodiment, the priority order information is stored in the APS packet and transmitted. The figure is a schematic diagram showing a configuration example of an Afs message storing priority information. In the aps message shown in Fig. 14, the section 322773 23 201218685 uses the area of the reserved area of the APS message shown in Fig. 11 as the area of the priority order information. In Fig. 14, the PCP (or I-PCP) included in the VLAN tag is used as the priority information as exemplified by the implementation of the bear i, and the area in which the PCP is stored is redefined. Then, the value of the PCP corresponding to the highest priority order described in the first embodiment is stored in the area. In addition, the priority information stored in the APS message is not limited to the PCP, and any information may be used as long as it is a prioritized information that is mutually agreed with the opposite device. In addition, the Request/State of the APS message storing the priority order information may also define and display the value in the switching when the intermixing is performed, and may also use the existing value such as SF. The r/s system can also be used to define the value corresponding to the handover when the hybrid is implemented. For example, Normal Traffic Signal can also be used. In addition, since the APS message is transmitted for each VLAN, the communication device 1 on the transmitting side of the APS message transmits an APS message storing the highest priority order corresponding to the VLAN. The communication device 1 on the transmitting side switches (and uses both the standby system and the active system) when the hybrid is mixed, and stores the pCP in the APS message and transmits it; as in the conventional system, it is only in the standby system or the active system. In the case where one of the paths is sent, the PCP is not stored in the APS message. Thereby, the communication device 2 can obtain the information on whether or not the communication device 1 is to be switched when it is switched, and the highest priority. In addition, the communication device may additionally notify whether or not to perform the hybrid handover (using both the standby system and the active system), and may also store the pep in the APS message. In the communication device 2, when it is recognized that the communication device 1 in the opposite direction is switched according to 24 322773 201218685, the path of the transmission selection system is determined (use: the game is used for the transmission at the time point) There is a miscellaneous in the path sent) and it is reasonable. In this case, the highest priority order of steps S13 and S14 of Ma Club M is the PCP notified by the APS message. Update the large device in step S14! In the case of the transmission H, the communication device 2 transmits the priority spit with the transmission path opposite to the communication device and the rugged device 2, and the communication device 2 detects the mismatch, and performs the communication device 1 described above. In the same operation, the communication device 1 performs the same operation as the above-described communication device 2. Figure 15 shows the other example of the configuration of the Aps message that does not store the priority information. In Fig. 4, although the pep corresponding to the highest priority order remains in the APS message, the shot in Fig. 15 corresponds to the message of the switching object (sent in the non-selection system). The priority order (the switching object priority order) is stored in the Aps message. As exemplified in FIG. 10 of the first embodiment, when the threshold value is set for each priority order, the case of switching when performing the hybrid, for example, can be transmitted in the form of FIG. 15 in the non-selection system. The communication device 2 is notified of the priority order. Further, although the example in which the priority order information is stored in the APS message and notified is described here, the priority order information is not limited to the notification by this method, and may be notified by any method. Fig. 16 is a view showing a sequence example of a case where switching at the time of mixing is performed. In Fig. 16, the WEST and EAST are regarded as the same communication devices as the communication device 1, respectively. Here, in the implementation of the hybrid handover, the Request/State of the Aps message is displayed as the implementation of the hybrid handover 322773 25 201218685

Figure 16 shows the full part of the SEL and BRG. Also, the value is treated as CON in the system. Also, in the communication between the first and the active system, the day B

The APS periodically issues the path of the system (step S31). In order to use the preparatory system, when EAST uses a certain port, it will use the VLAN of the implementation system as the selection system (as the following message is switched to non-selection ^, the leg is for each - Switch the target VLAN and send the display to display the Aps message (c优先n (priority order (4)) when the highest priority thread is stored. Step S25 is the same as the example in Figure 13. When receiving the message, it will be based on the highest. The priority is switched in such a manner that the non-selection system transmits the most prioritized traffic (step S33). In this case, the WEST switching control unit 13 performs path switching in accordance with an instruction from EAST. Thus, 'WEST The function also includes the function of switching the control means based on the instruction to switch the route from the highest priority order of the EAST notification when the EAST detects the miscellaneous. Steps S27 and 29 are the same as the example of Fig. 13. In the case where the switching in the implementation is switched according to the matching of the opposite device, the switching is performed, although the service is also sent (r/b=n〇rmal), but the display-dependent device may be additionally selected. In the case of the miscellaneous, the notification of the handover is performed and the value of the handover is implemented and the APS message storing the value is transmitted. Further, the EAST transmits the C0N (priority order) as the APS periodically (steps S34, S35). 322773 26 201218685 And switching to the normal use only, using the APS message to notify the other 'Estate is in the hybrid elimination, the standby system or the current system to send the message of 0. In this embodiment, the case of two-way communication, when implemented When the hybrid time switching is performed in the same manner as in the first embodiment, the switching control unit 13 stores the highest priority order in the APS message and transmits it, and then switches to the received highest priority order = path stored in the APStfL information. Therefore, even if the reciprocating transmission path is set to phase (4), the communication of the priority system is not interrupted, and the mix of the active system paths can be reduced. (Industrial availability) The communication device of the invention and the path switching D system can be set in a two-way communication device in which a point-to-point active system is pre-set between devices of the communication partner Effective use, especially for a variety of money order information [simplified description of the drawings] Fig. 1 is a schematic diagram showing a configuration example of the communication system of the first embodiment. Fig. 3 is a schematic diagram showing an example of the use of path information. Fig. 4 is a view showing a configuration example of an Ethernet (registered trademark) frame. Fig. 5 is a view showing a configuration example of C_TAGTCI. 201218685 Fig. 6 is a schematic diagram showing a configuration example of S-TAG TCI and B-TAG TCI. Fig. 7 is a view showing a configuration example of I-TAG TCI. Fig. 8 is a diagram showing an example of an active system path and a preliminary system path of each traffic. Fig. 9 is a flow chart showing an example of the procedure of the path switching processing in the first embodiment. Fig. 10 is a diagram showing an example of usage path information for the case where the threshold value is set for each priority order. Fig. 11 is a diagram showing an example of a configuration of an APS protocol message (APS message) format. Figure 12 is a diagram showing the information contained in the data format of the APS Agreement. Fig. 13 is a sequence diagram showing an example of a path switching sequence in the case of using an APS message. Fig. 14 is a view showing an example of a configuration of an APS message storing priority order information. Fig. 15 is a view showing another configuration example of the APS message storing the priority order information. Fig. 16 is a view showing a sequence example of a case where switching at the time of mixing is performed. [Description of main component symbols] 1, 2 communication device 3, 4 communication path 28 322773 201218685 11 ' 16 communication interface 12 transmission processing unit 13 switching control unit 14 obstacle monitoring unit 15 traffic flow measuring unit 21-1 to 21-5 埠Mouth 22-1 to 22-5 Mouth 3 Bu 32, 33 - Communication 29 322773

Claims (1)

201218685 VII. Patent application scope: 1. A communication device is a device that sets a plurality of communication paths between a communication device and a corresponding communication device, and is characterized in that: a hybrid determination means is provided, and one of the communication paths is used as a communication path A selection path is used to determine whether the selected path is confounded when the data is transmitted using the selection path; and the switching control means selects one of the transmission data as the switching target when the hybrid determination means determines that the selected path is mixed. Data, and the transmission path of the switching object data is switched to a communication path other than the selected path. 2. The communication device according to claim 1, wherein the communication device includes: an obstacle detection means for detecting an obstacle of the communication path; and the switching control means is configured to detect an obstacle in the selection path by the obstacle detection means And switching the transmission path of the transmission data to the foregoing communication path other than the foregoing selection path. 3. The communication device according to claim 1 or 2, wherein the switching control means selects the switching target data based on a priority order included in the transmission data. 4. The communication device according to claim 3, wherein the “the aforementioned switching control means maintains a pre-selected highest priority order, and selects a transmission data corresponding to the priority order below the highest priority order as the just-described switching. Oblique data. 5. The communication device according to claim 4, wherein the hybrid determination means determines that the selection path is confounded when a traffic flow rate of the selected path exceeds a predetermined threshold value of 1 322773 201218685. 6. The communication device according to claim 3, wherein the hybrid determination means maintains a pre-selected threshold value of each priority traffic stream $ and a traffic flow in the selected path When the threshold value corresponding to the priority of the transmission > is exceeded, the transmission data is selected as the switching target data. 7. The communication device according to claim 2 or 2, wherein a plurality of communication paths are set for each VLAN; and the hybrid determination means determines whether the selected path is mixed for each VLAN; The handover control means switches the aforementioned transmission path for each VUN. 8. The communication device according to claim 3, wherein a plurality of communication paths are set for each VLAN; and the hybrid determination means determines whether the selected path is mixed for each VLAN; the foregoing switching (four) means The aforementioned transmission path is switched for each-VLM. 9. The communication device as claimed in claim 8 wherein the foregoing cutting control means maintains a pre-selected highest priority for each job and selects a priority order from the highest priority order below. The transmission data is used as the aforementioned switching object data. 1. The communication device according to claim 9, wherein the hybrid determination means maintains a pre-selected threshold value of each of the leaked traffic flows 2 322773 201218685 and for each VLAN In the case where the above-mentioned selection path=the amount exceeds the predetermined threshold value, it is determined that the above-mentioned road:: 11. The communication device according to claim 10 of the patent application scope, & the judging determination means maintains a pre-selected per-VUN and The threshold of the traffic flow of the combination of the superiors, and in the case where the selected traffic flow exceeds the VLM of the transmitted data and the priority of the transmission of the data = 'select the transmission data as the foregoing ς "a as the scope of the patent application The communication device described in any one of item 8 to item 'where the priority order is regarded as the PCP of the VLAN tag. 13· As in the fourth, fifth, and ninth items of the patent scope, The above-mentioned switching control means transmits the highest priority position to the aforementioned communication device. The communication device according to item 6 or item 7 of the Patent No. 7 , where 'the aforementioned switch (four) The means sends the priority spray position which is selected as the data to be sent to the aforementioned relative communication device. 5. If the application is special (4) 13 tracks, the above-mentioned, change control f丨手& When receiving the forward-opposing device from the opposite communication device to switch the highest priority of the transmission path, 'select the transmission data corresponding to the priority order below the highest priority order received as the foregoing The communication device according to claim 14, wherein the switching control means receives the transmission direction of the communication device 322773 3 201218685 from the opposite communication device. When selecting the priority order that has been received, the following is the information of the above-mentioned switching object. The data is transmitted as π.-type communication, and the second is the second aspect of the communication device. a communication device, and a plurality of links are set between the front=front fan and the second communication device; the communication communication two-way communicator is characterized by: The first communication device includes: a hybrid determination means for determining whether the selected path is present or not when the data is selected as the selected path in the communication path; and In the case where the hybrid determination means determines that the path is mixed, the transmission control means selects the "part=flag selection image data" and switches the transmission path of the switching target data, and performs communication other than the selected pair of paths. a path, and a pre-key to be used for selecting the switching object is sent to the second communication device; the second communication device includes: means (4) means, when the condition is as described above from the 帛liim According to the foregoing predetermined condition, the transmission-part is selected as the indication switching data, and the above-mentioned finger routing path is switched to the communication path 4 other than the selected path. 18. The road location switching method has a plurality of communication with the opposite direction. The path in the communication device of the communication path = the sign is: contains: No. 322773 4 201218685 Hybrid judgment Taking one of the aforementioned communication paths as a selection path, and determining whether the selected path is mixed if data is transmitted using the selected path; and switching control step of determining the selected path mixed in the hybrid determination step In the case, one of the transmission materials is selected as the switching target data, and the transmission path of the switching target data is switched to the communication path other than the selected path. 19. A path switching method comprising: providing a first communication device and a second communication device facing the first communication device; and setting a plurality of communication paths between the first communication device and the second communication device A path switching method in a communication system for two-way communication, comprising: a hybrid determination step of: the first communication device uses one of the communication paths as a selection path, and transmits the data using the selected path And determining whether the selection path is confounded or not; and in the switching control step, when the first communication device determines that the selection path is mixed in the hybrid determination step, selecting one of the transmission data as the switching target data, and the foregoing a transmission path of the switching target data is switched to a communication path other than the selected path, and a predetermined condition for selecting the switching target data is transmitted to the second communication device; and a switching control step is performed, wherein the second communication device is from the foregoing When the first communication device receives the aforementioned predetermined condition, Then, according to the foregoing predetermined clause 5 322773 201218685, one part of the transmission data is selected as the instruction switching data, and the transmission path of the instruction switching data is switched to the communication path other than the foregoing selection path. 6 322773