JP2006340165A - Communication path switching control system and router apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication path switching control system and router apparatus in which various line control operations corresponding to line faults can be realized also at a low-order apparatus side by also notifying a low-order apparatus that is a communication apparatus to be connected to a router, of a line fault. <P>SOLUTION: The present invention relates to a communication path switching control system 1A which comprises a first IPGW 10A for accommodating and connecting a first PBX 9A and a first router 6A in charge of a communication interface between a network and the first IPGW, and in which when a line fault is detected on a communication path under use at present among a plurality of communication paths within the network, the first router searches for a communication path which bypasses the line fault, from the plurality of communication paths and switches a connection to the searched communication path. The first router comprises a switching information notification section 52 for notifying the first IPGW of path switching information relating to the connection switched communication path if the connection is switched to the searched communication path, and the first IPGW comprises a line control section 62 for controlling the line of the first PBX based on the path switching information if the path switching information from the switching information notification section is detected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention comprises, for example, a routing table in which a plurality of communication paths in a network are set, and when a line failure in the communication path is detected, a communication path that bypasses the line failure is searched from the plurality of communication paths in the routing table, The present invention relates to a communication path switching control system and a router apparatus that are set to switch to the searched communication path.

  Conventionally, as a router device used in such a communication path switching control system, when searching for a communication path to a certain destination, there are a plurality of communication paths, and the cost (line speed, delay time, etc.) of each communication path exists. ) Are equal, these multiple communication paths are set as routing path candidates in the routing table. For example, even if a line failure occurs in the communication path in use, the line failure is bypassed from the multiple communication paths in the routing table. A technique for searching for a communication path to be switched and switching to the searched communication path is widely known (see, for example, Patent Document 1).

  A general communication path switching control system will be described with reference to the drawings. FIG. 5 is a block diagram showing a schematic configuration inside a general communication path switching control system.

  The communication path switching control system 1 shown in FIG. 5 is configured to communicate and connect the first base 2A and the second base 2B that accommodate and connect a plurality of terminals, and the first base 2A and the second base 2B through a plurality of communication paths. The network 3 has a management base 4 that monitors the communication status of the first base 2A and the second base 2B. The IP network 3 includes, for example, the 100 Mbps line of the first communication carrier 5A and the second communication carrier 5B. Configuration having 10 Mbps line, the first base 2A and the second base 2B using the first carrier 5A line as a main line and the second carrier 5B line as a backup line to cope with a line failure It is said.

  For example, the line of the first communication carrier 5A is used as a main line, so the line capacity is increased. On the other hand, the line of the second communication carrier 5B is used as a backup line. Therefore, the line capacity is generally reduced in consideration of the line maintenance cost.

  The first site 2A includes a first router 6A that controls a communication interface with the line of the first communication carrier 5A, a second router 6B that controls a communication interface with the line of the second communication carrier 5B, and a first router such as a personal computer. 1 Data terminal 7A, 1st telephone terminal 8A, 1st PBX (private branch exchange) 9A accommodating and connecting 1st telephone terminal 8A, 1st IPGW 10A which manages the IP communication interface with 1st PBX 9A, these 1st routers 6A, The second router 6B, the first data terminal 7A, and the first IPGW 10A have a LAN 11A for IP connection.

  The second base 2B includes a third router 6C that controls a communication interface with the line of the first communication carrier 5A, a fourth router 6D that controls a communication interface with the line of the second communication carrier 5B, a personal computer, and the like. The second data terminal 7B, the second telephone terminal 8B, the second PBX 9B that accommodates and connects the second telephone terminal 8B, the second IPGW 10B that controls the IP communication interface with the second PBX 9B, the third router 6C, and the fourth router 6D, the second data terminal 7B, and the LAN 11B for IP connection between the second IPGW 10B. It is assumed that a base code is assigned to the first base 2A and the second base 2B.

  The management base 4 monitors a communication status of the first base 2A and the second base 2B through the router 6E that controls a communication interface with the lines of the first communication carrier 5A and the second communication carrier 5B, and the router 6E. The communication terminal regularly distributes the communication confirmation packet from the management terminal 7C to the first base 2A and the second base 2B, and based on the reception status of the response packet to the communication confirmation packet, the first base 2A And the communication status of the second base 2B.

  For example, when a call is made from the first telephone terminal 8A of the first base 2A to the second telephone terminal 8B of the second base 2B, the user of the first telephone terminal 8A in the first base 2A may, for example, call a special number or a destination base The code and extension number are dialed.

  When the first PBX 9A in the first base 2A detects a dialing special number from the first telephone terminal 8A, a destination base code and an extension number dialing operation, the first PBX 9A notifies the first IPGW 10A of the destination base code and extension number. Since the first IPGW 10A has a number conversion table (GW side RAM) that manages the IPGW IP address for each base code, when the destination base code is detected from the first PBX 9A, the destination base code is converted to the IP address. Convert to

  When the first IPGW 10A converts the destination base code into an IP address, the first router 6A (or the second router 6B) transmits an IP packet containing the extension number as data to the second IPGW 10B, based on the IP address. ) And the second IPGW 10B via the IP network 3.

  When receiving the IP packet from the first IPGW 10A, the second IPGW 10B notifies the second PBX 9B in the second base 2B of the extension number included in the IP packet. When the second PBX 9B detects the extension number, the second PBX 9B performs an incoming call operation on the second telephone terminal 8B corresponding to the extension number. Note that call control between the telephone terminals between the first base 2A and the second base 2B is based on the SIP protocol as a standard.

  FIG. 6 is a block diagram showing a schematic configuration inside the first IPGW 10A and the first router 6A. Note that the internal configuration of the second IPGW 10B is substantially the same as the internal configuration of the first IPGW 10A, and therefore the description of the overlapping configuration and operation is omitted. Similarly, since the internal configurations of the second router 6B, the third router 6C, and the fourth router 6D are almost the same as the internal configuration of the first router 6A, the description of the overlapping configuration and operation is also omitted. .

  The first IPGW 10A includes a tone ROM 11 that stores voice signal data used for various call controls, a data area that stores configuration definition data and a number conversion table, and a GW-side RAM 12 that includes a work area for performing various operations. ROM 13 storing various programs, RTC 14 for timing control of time information for log storage and various maintenance commands, RS-232C connector 15 serving as a serial interface with a maintenance PC (not shown), and RS-232C connector 15 The serial driver 16 for controlling the serial interface with the maintenance PC through the plurality of RJ-45 connectors 17 wired to the first PBX 9A and the audio signal and control signal from the first PBX 9A are separated, and the separated audio signal To convert analog to audio analog signal Unit 18, CODEC 19 that converts this audio analog signal into a PCM audio digital signal, ODCNT 20 that performs audio compression preprocessing on the audio digital signal and controls the first PBX 9 A, and audio compression / decompression processing The DSP 21 that executes various processing operations such as the above, the MPU 22 that controls the entire first IPGW 10A, the PHY 23 that controls the LAN interface, and the RJ-45 connector 24 that is connected to the first router 6A.

  The DSP 21 executes audio signal compression / decompression, PB signal analysis, fluctuation control, level control, and echo canceller control.

  MPU22 is H.264. 233 call control control, IP level protocol control, TCP and UDP layer 4 protocol control, OD interface control, and voice compression signals from the DSP 21 are converted into UDP / IP frames. Further, the MPU 22 executes RTP protocol control, various command control, configuration creation control, SNMP agent, and selection signal determination processing.

  When the MPU 22 receives the destination base code + extension number from the first telephone terminal 8A accommodated and connected to the first PBX 9A, the MPU 22 reads the IP address corresponding to the base code from the GW RAM 12 and converts the data into an IP packet. The IP packet is transmitted to the PHY 23.

  The PHY 23 converts the IP packet created by the MPU 22 into a MAC frame and transmits it to the first router 6A, receives an IP packet from the MAC frame of the first router 6A, and transmits this IP packet to the MPU 22.

  The first router 6A includes an RJ-45 connector 31 connected to the first IPGW 10A, an RJ-45 connector 32 connected to the IP network 3, an RS-232C connector 33 connected to the maintenance PC, and a serial driver 34. A router-side RAM 35 for storing various information, a router-side ROM 36 for storing various programs, a routing processor 37 for controlling various IP packet relays, and a CPU 38 for controlling the entire first router 6A. ing.

  The routing processor 37 periodically distributes Hello packets between other router devices in the IP network 3, for example, the second router 6B, the third router 6C, and the fourth router 6D, and determines whether or not the Hello packets are received. The link state in the network is grasped, a common link state database in the network is created, and its own routing table is created based on the common link state database.

  FIG. 7 is a functional block diagram showing a schematic configuration inside the routing processor 37 in the first router 6A.

  The routing processor 37 shown in FIG. 7 is connected to the RJ-45 connector 31 to control the communication interface with the IP network 3, and is connected to the RJ-45 connector 32 to control the communication interface with the first IPGW 10A. The LAN interface 42 that converts the MAC frame from the first IPGW 10A into IP packet information, the filter QoS table 43 that stores the IP address of the IP packet to be discarded and the IP packet to be prioritized, and the routing for determining the routing destination Based on a routing table storage unit 44 that creates a table, a packet buffer 45 that temporarily stores IP packets, a forwarding ASIC 46 that performs relay reception and transmission of IP packets, and IP packet information And a routing ASIC47 determining the computing destination.

  When receiving the IP packet through the LAN interface 41 (42), the forwarding ASIC 46 temporarily stores the IP packet in the packet buffer 45 and notifies the routing ASIC 47 of IP packet information related to the IP packet. The IP packet information corresponds to address information such as a transfer destination IP address, a transfer source IP address, a transfer destination port number, and a transfer source port number.

  When the routing ASIC 47 obtains the IP packet information through the forwarding ASIC 46, the routing ASIC 47 compares the IP packet information with the table contents of the filter QoS table 43, and determines whether the IP packet is an IP packet to be discarded. If it is determined that the IP packet is not an IP packet to be discarded, it is determined whether or not the IP packet is an IP packet to be prioritized.

  Furthermore, the routing ASIC 47 searches the forwarding table port number from the routing table storage unit 44 based on the IP packet information according to the priority determination result of the IP packet information, and determines the routing destination based on the search result.

  Upon obtaining the routing destination determination result of the routing ASIC 47, the forwarding ASIC 46 outputs the IP packet temporarily stored in the packet buffer 45 through the LAN interface 42 (41) based on the routing destination determination result.

  FIG. 8 is an explanatory diagram simply showing a communication route in the general communication route switching control system 1, and FIG. 9 is an explanatory diagram showing a routing table related to the normal operation of the first router 6A.

  The first IPGW 10A shown in FIG. 8 is connected to the first router 6A through the communication line N1. The first router 6A is connected to the second router 6B through the communication line N2, and is connected to the third router 6C through the communication line N3. The communication line N3 corresponds to the line of the first communication carrier 5A.

  The second router 6B is connected to the fourth router 6D through the communication line N4. The communication line N4 corresponds to the line of the second communication operator 5B.

  The fourth router 6D is connected to the third router 6C through the communication line N5 and is connected to the second IPGW 10B through the communication line N6. In such a communication path configuration, for example, when a communication connection is established between the first IPGW 10A and the second IPGW 10B, the normal communication path is as follows: first IPGW 10A → communication line N1 → first router 6A → communication line N3 → third router 6C → communication When the line N6 → the second IPGW 10B, the routing table of the first router 6A stores a transit router for connecting to the same communication line for each communication line. For example, the communication line N1, the communication line N2, and the communication line N3 are own routers. Thus, a communication path is created such that the direct connection is established, the communication line N4 is routed through the second router, and the communication line N5 and the communication line N6 are routed through the third router. In the routing table shown in FIG. 9, for convenience of explanation, a router name or the like is registered as the next hop for each communication line, but in reality, IP address information such as a port number is registered.

  In addition to the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D create routing tables for their communication paths.

  10 and 11 are operation sequences showing processing operations related to the routing table creation processing of each router in the general communication path switching control system 1.

  The first router 6A, the second router 6B, the third router 6C, and the fourth router 6D distribute the Hello packet to each other and recognize the link state of the entire network based on the presence / absence of a response to the Hello packet. . In the normal network state, a routing table is created when the power is turned on.

  The first router 6A multicasts the link state of the communication line to which the first router 6A is connected and the subnet information for identifying the multicast to the second router 6B, the third router 6C, and the fourth router 6D in a Hello packet (step). S11).

  Similarly, the third router 6C also multicasts the link state of the communication line to which the third router 6C is connected and the subnet information for identifying itself to the first router 6A, the second router 6B, and the fourth router 6D in a Hello packet. (Step S12).

  Similarly, the second router 6B also multicasts the link state of the communication line to which the second router 6B is connected and the subnet information for identifying itself to the first router 6A, the third router 6C, and the fourth router 6D in a Hello packet. (Step S13).

  Similarly, the fourth router 6D also multicasts the link state of the communication line to which it is connected and the subnet information for identifying itself to the first router 6A, the second router 6B, and the third router 6C in Hello packets. Distribute (step S14).

  Next, when the first router 6A receives the Hello packet from the second router 6B, the third router 6C, and the fourth router 6D, the first router 6A is connected to the network based on the link state of each router and its own link state included in the Hello packet. A link state database indicating the overall link state is created (step S15).

  Similarly, when the second router 6B receives the Hello packet from the first router 6A, the third router 6C, and the fourth router 6D, the network is determined based on the link state of each router included in the Hello packet and the link state of itself. A link state database indicating the overall link state is created (step S16). Similarly, when the third router 6C receives Hello packets from the first router 6A, the second router 6B, and the fourth router 6D, the third router 6C is based on the link state of each router and its own link state included in the Hello packet. Then, a link state database indicating the link state of the entire network is created (step S17). Similarly, when the fourth router 6D receives the Hello packet from the first router 6A, the second router 6B, and the third router 6C, the fourth router 6D is based on the link state of each router included in the Hello packet and its own link state. Then, a link state database indicating the link state of the entire network is created (step S18).

  In FIG. 11, the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D exchange the link state databases created by themselves (step S21) to obtain a common link state database. .

  Then, the first router 6A creates a routing table (see FIG. 9) related to the current first router 6A based on the common link state database (step S22). Similarly, the second router 6B also creates a routing table related to the current second router 6B based on the common link state database (step S23). Similarly, the third router 6C also creates a routing table related to the current third router 6C based on the common link state database (step S24). Similarly, the fourth router 6D also creates a routing table related to the current fourth router based on the common link state database (step S25).

  As a result, the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D determine communication paths based on their routing tables.

  Then, the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D periodically multicast the Hello packet, and monitor its link state based on the presence / absence of a response to each Hello packet. (Step S26).

  According to the normal routing table creation process shown in FIGS. 10 and 11, the routers in the network mutually distribute the Hello packets, and each router creates a common link state database in the network based on the Hello packets. Since each router creates its own routing table based on the link state database, each router grasps the link state in its own network and determines the communication path.

  Next, the operation when a line failure occurs in the network will be described. FIG. 12 is an explanatory diagram simply showing a state in which a line failure has occurred in the communication line N3 between the first router 6A and the third router 6C, and FIG. 13 simply shows the contents of the routing table of the first router 6A at the time of the line failure. FIG. 14 is an operation sequence showing the operation of the communication path switching control system 1 when the line failure occurs.

  The first router 6A, the second router 6B, the third router 6C, and the fourth router 6D periodically distribute Hello packets to each other by multicast, and recognize their link status based on the presence / absence of responses to these Hello packets. However, for example, if the first router 6A determines that there is no response to the Hello packet to the third router 6C, it detects a port down (line failure) of the communication line N3 with the third router. (Step S31).

  When detecting the line failure of the communication line N3, the first router 6A creates its own link state database based on the detection result (failed port information) (step S32).

  The first router 6A performs an exchange operation of the link state database in order to reflect the link state database of the first router 6A to the second router 6B, the third router 6C, and the fourth router 6D ( Step S33). As a result, the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D share the link state database related to the line failure of the first router 6A created in step S31.

  The first router 6A, the second router 6B, the third router 6C, and the fourth router 6D create and update their own routing table based on the common link state database (step S34). The first router 6A creates and updates a routing table in which the communication line N1 and the communication line N2 are directly connected and the communication line N4, the communication line N5, and the communication line N6 are the second router as shown in FIG. Become. As a result, the communication path between the first IPGW 10A and the second IPGW 10B is as follows: first IPGW 10A → communication line N1 → first router 6A → communication line N2 → second router 6B → communication line N4 → fourth router 6D → communication line N5 → third A communication path that bypasses the communication line N3 having a line failure is determined, such as the router 6C → the communication line N6 → the second IPGW 10B.

  Then, the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D periodically deliver Hello packets to adjacent routers (step S35), and whether or not there is a response to each Hello packet. Based on this, the link state of itself is monitored. The adjacent routers are, for example, the second router 6B and the third router 6C in the case of the first router 6A, and the first router 6A, the fourth router 6C, and the third router 6C in the case of the second router 6B. The first router 6A, the fourth router 6D, and the fourth router 6D correspond to the second router 6B and the third router 6C.

  According to the routing table creation process at the time of a line failure shown in FIG. 14, the routers in the network monitor their link states to create a common link state database for the entire network, and each router has a common link state database. Based on this, each router in the network decides a communication path that bypasses the communication line with the same line failure even if a line failure occurs in the communication line in the network. Can do.

Therefore, according to such a general communication path switching control system 1, while using the communication line N3 (main line) of the first communication carrier 5A as a normal communication path between the first IPGW 10A and the second IPGW 10B, When a line failure occurs in the communication line N3, the router automatically switches to the communication line N4 (backup line) of the second communication carrier 5B, and the first IPGW 10A → the communication line N1 → the first router 6A → the communication line N2 Since the second router 6B → the communication line N4 → the fourth router 6D → the communication line N5 → the third router 6C → the communication line N6 → the second IPGW 10B, the first communication business between the first IPGW 10A and the second IPGW 10B is performed. Even if a line failure occurs in the communication line N3 (main line) of the operator 5A, the communication line N4 (back) of the second communication operator 5B -Up line) can automatically switching the communication route using.
JP 2002-300193 A (see paragraph numbers “0002” to “0003”)

  However, according to the general communication path switching control system 1, each routing table based on a link state database common to the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D in the network. Therefore, even if a line failure occurs in the communication line N3 in the network, the communication line N3 (main line) at the line location is bypassed based on the routing table, that is, the communication line N4 (backup line) ) Is switched to the communication path using the communication path. However, since the lower level apparatus which is a communication apparatus connected to the router, for example, the first IPGW 10A is not notified that the line failure has occurred, the lower level apparatus side A line system that cannot recognize a line failure and handles the line failure on the lower-level device side. For example, when the capacity of the backup line is small compared to the main line, the situation is such that the line capacity is over or the line is occupied by the voice system and data cannot be transmitted. Is also possible.

  The present invention has been made in view of the above points, and an object of the present invention is to control various lines corresponding to a line fault by notifying a lower level apparatus which is a communication apparatus connected to a router of the line fault It is an object of the present invention to provide a communication path switching control system and a router apparatus that can realize the operation on the lower apparatus side.

  In order to achieve the above object, a communication path switching control system of the present invention includes a gateway device that accommodates and connects a plurality of communication devices, and a router device that manages a communication interface between the network and the gateway device. When a line failure is detected in a communication path in use among a plurality of communication paths in the network, a communication path that bypasses the line failure is searched from the plurality of communication paths, and the connection is switched to the searched communication path. A communication path switching control system, wherein the router device has switching information notification means for notifying the gateway device of path switching information related to the switched communication path when switched to the searched communication path. When the gateway device detects the route switching information from the switching information notification means, the gateway device is based on the route switching information. Come, and to have a line control means for line control to the communication device.

  In the communication path switching control system of the present invention, when the line control means detects the path switching information, line control for closing the line of the communication device is performed based on the path switching information.

  In the communication path switching control system according to the present invention, when the line control unit detects the path switching information, the communication usage limit of the line used by the communication device is reduced based on the path switching information. Line control was performed.

  In the communication path switching control system of the present invention, the path switching information includes line fault information indicating the line fault location.

  In the communication path switching control system according to the present invention, when the router failure is recovered, the router device switches back to the communication path before the line failure, and the switching information notification means includes the communication path before the line failure. When the switchback connection is made, the gateway device is notified of the route switching information related to the communication path connected to the switchback, and the line control means switches the path related to the communication path connected back from the switch information notification means. When the information is detected, the line control state of the communication apparatus is returned to the line control state before the line failure based on the route switching information.

  In order to achieve the above object, the router device of the present invention controls a communication interface with a network, and detects a line failure in a communication path in use among a plurality of communication paths in the network. A router device that searches for a communication path that bypasses a line failure from a plurality of communication paths, and is connected to the searched communication path. When the switch is connected to the searched communication path, the route related to the switched communication path Route switching information notification means for notifying the switching information to devices other than the own router device is provided.

  In the router device of the present invention, the path switching information includes line failure information indicating the line failure location.

  When the line failure is recovered, the router device of the present invention switches back to the communication path before the line failure, and the switching information notification means switches back to the communication path before the line failure. Route switching information related to the back-connected communication route is notified to other devices other than the own router device.

  According to the communication path switching control system of the present invention configured as described above, when switching connection is made to the searched communication path so as to bypass the line failure, the path switching information related to the switched communication path is transmitted to the gateway device. A switching information notification means for notifying is provided in the router device, and the gateway device has a line control means for controlling the communication device based on the route switching information when the route switching information is detected from the switching information notification means. Therefore, the gateway device can execute various line control operations related to the line failure, for example, on the communication device by recognizing the communication path that bypasses the line failure from the router device.

  According to the communication path switching control system of the present invention, when the path switching information is detected, the communication apparatus is line-controlled to block the communication apparatus based on the path switching information. Even if the line is switched to a line with a smaller line capacity in the event of a line failure, by suspending the communication device from allocating the same line to the voice line and preferentially allocating it to the data line, the line is occupied by the voice system and data is lost. It is possible to reliably prevent a situation in which transmission becomes impossible.

  According to the communication path switching control system of the present invention, when the path switching information is detected, the communication apparatus is subjected to line control based on the path switching information so as to reduce a communication usage allowable amount of the line of the communication apparatus. Therefore, for example, even if the line is switched to a line with a small line capacity at the time of a line failure, it is possible to reliably prevent a situation such as a line capacity being exceeded.

  According to the communication path switching control system of the present invention, a line fault location can be recognized on the gateway device side.

  According to the communication path switching control system of the present invention, when switching back to the communication path before the line failure is made in response to the restoration of the line failure, the route switching information related to the communication path that has been switched back is transferred from the router device to the gateway device. And when the gateway device detects the route switching information related to the communication path that has been switched back, the line control state of the communication device is returned to the line control state before the line failure based on the route switching information. Thus, when the line failure is recovered, the line control state before the line failure can be automatically restored.

  Further, according to the router device of the present invention configured as described above, when switching connection is made to the searched communication path so as to bypass the line failure, the route switching information related to the switched communication path is transmitted to other than the own router device. Since other gateway devices, for example, gateway devices that accommodate and connect communication devices are notified, for example, gateway devices recognize communication paths that bypass line failures from router devices, and Various line control operations related to a line failure can be executed.

  According to the router device of the present invention, a line fault location can be recognized by a device other than the own router device, for example, the gateway device side.

  According to the router device of the present invention, when a line failure is recovered, a switchback connection is made to the communication path before the line failure, and when a switchback connection is made to the communication path before the line failure, a route related to the communication path connected to the switchover is established. Since the switching information is notified to other devices other than the own router device, when the line failure is recovered, it is automatically switched back to the communication path before the line failure and other devices other than the own router device, For example, it can be recognized on the gateway device side.

  Hereinafter, a communication path switching control system showing an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of the MPU 22 inside the first IPGW apparatus 10A and the CPU 38 inside the first router 6A, which are the main parts related to the present embodiment. The same components as those in the general communication path switching control system 1 shown in FIG. 5 are denoted by the same reference numerals, and the description of the overlapping configuration and operation is omitted.

  The communication path switching control system 1A showing the present embodiment is different from the communication path switching control system 1 shown in FIG. 5 in that the MPU 22 and GW side RAM 12 in the first IPGW 10A (second IPGW 10B) and the first router 6A (first router) 2 router 6B, 3rd router 6C, and 4th router 6D) The CPU 38 and the router side RAM 35 are configured as follows.

  The CPU 38 in the first router 6A shown in FIG. 1 shares a common link state database in the network by mutual communication between the second router 6B, the third router 6C, and the fourth router 6D, and based on this link state database. When the own routing table is updated, the current routing table is compared with the normal routing table stored in the router-side RAM 35 to determine whether or not there is a comparison difference, and this routing comparison unit If it is determined at 51 that there is a comparison difference, the switching information notification unit determines that it is not normal, that is, notifies the first IPGW 10A of the path switching information indicating that the path switching has been performed by the MAC frame through the routing processor 37. 52.

  In the first router 6A, for example, when a line failure of the communication line N3 is detected, a communication line that bypasses the line failure is determined by creating and updating a routing database reflecting the line failure. The path switching information indicating that the path switching of the communication line N3 in which the failure has occurred is notified to the first IPGW 10A, which is a lower device of the first router 6A.

  Similarly, when the first router 6A detects, for example, recovery of a line failure of the communication line N3, the first router 6A creates and updates a routing table reflecting the link state before the line failure, that is, a normal routing table, thereby updating the communication path. Is switched back to the communication path before the line failure.

  At this time, the switching information notification unit 52 in the CPU 38 of the first router 6A compares the current routing table with the normal routing table stored in the router side RAM 35 in the routing comparison unit 51, and there is no comparison difference. When the determination is made, the path switching information indicating that the connection is switched back to the communication path using the normal communication line N3 is notified to the first IPGW 10A by the MAC frame through the routing processor 37.

  Also, the MPU 22 inside the first IPGW 10A reads from the GW RAM 12 the switching information detection unit 61 that detects the route switching information via the PHY 23, and the line control data corresponding to the route switching information detected by the switching information detection unit, Based on this line control data, a line control unit 62 for controlling the ODCNT 20 is provided to control the first PBX 9A accommodated and connected to the first IPGW 10A. In the GW side RAM 12, for example, line control data related to voice line blockage corresponding to path switching information indicating path switching due to occurrence of a line fault, or voice corresponding to path switching information indicating path switchback due to line fault recovery, for example. It is assumed that line control data related to line block release is stored and managed.

  Accordingly, when the line control unit 62 of the MPU 22 detects the route switching information indicating the route switching due to the occurrence of the line failure in the switching information detection unit 61, the line control data related to the voice line blockage corresponding to the route switching information is transmitted to the GW side. The line control operation for blocking the voice line of the first telephone terminal 8A for the lower first PBX 9A is executed by continuing the SS command ON through the ODCNT 20 based on the line control data read from the RAM 12.

  In addition, when the line control unit 62 of the MPU 22 detects the route switching information indicating the route switchback due to the restoration of the line failure in the switching information detection unit 61, the line control data related to the release of the voice line blockage corresponding to the route switching information is obtained. By reading out from the GW side RAM 12 and continuing the SS command OFF through the ODCNT 20 based on the line control data, the line control operation for releasing the voice line blockade of the first telephone terminal 8A for the lower first PBX 9A is executed.

  The communication path switching control system according to the claims is the communication path switching control system 1A, the gateway devices are the first IPGW 10A and the second IPGW 10B, the network is the IP network 3, the router devices are the first router 6A, the second router 6B, and the third router. 6C and the fourth router 6D, the switching information notification means corresponds to the switching information notification section 52, the line control means corresponds to the switching information detection section 61 and the line control section 62, and the lower devices as communication devices correspond to the first PBX 9A and the second PBX 9B. is there.

  Next, the operation of the communication path switching control system 1A showing the present embodiment will be described.

  First, the operation when a line failure occurs in the network will be described. FIG. 2 is an operation sequence showing the operation of the communication path switching control system 1A when a line failure occurs in the communication line N3 between the first router 6A and the third router 6C.

  The first router 6A, the second router 6B, the third router 6C, and the fourth router 6D shown in FIG. 2 are links that reflect the line failure created by the first router 6A when a line failure occurs in the communication line N3. By sharing the state database and creating and updating its own routing table based on this common link state database, the communication path between the first IPGW 10A and the second IPGW 10B is switched and connected to the communication path bypassing the line failure. (See steps S31 to S34 shown in FIG. 14).

  At this time, when the routing comparison unit 51 of the CPU 38 of the first router 6A creates and updates the routing table reflecting the line failure, the current routing table is compared with the normal-time routing table stored in the router-side RAM 35 ( Step S51).

  When the routing comparison unit 51 determines that there is a comparison difference, the switching information notification unit 52 in the CPU 38 determines that the switching is not normal, and displays the path switching information indicating that the path switching has been performed due to a line failure, as the first IPGW 10A. Is prepared on the routing processor 37 side (step S52).

  The routing processor 37 converts the path switching information into an IP packet and a MAC frame, and notifies the first IPGW 10A of the path switching information (step S53).

  When the switching information detection unit 61 in the MPU 22 in the first IPGW 10A detects the switching route notification information via the PHY 23, the switching information notification unit 61 returns the switching route notification information to the first router 6A to indicate that it has responded to the switching route notification information. At the same time, the switch path notification information is notified to the line control unit 62 (step S54).

  The line control unit 62 in the MPU 22 searches the GW side RAM 12 for line control data corresponding to the path switching information when a line failure occurs, and controls the ODCNT 20 to control the first PBX 9A based on the searched line control data. (Step S55).

  The ODCNT 20 performs the voice line blocking operation on the first PBX 9A by continuing to turn on the SS command based on the line control data (step S56).

  Based on the line control of the ODCNT 20 in the first IPGW 10A, the first PBX 9A stops the transmission operation of the designated channel of the telephone terminal 8A by closing the line of the telephone terminal 8A (step S57).

  Then, the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D periodically deliver Hello packets to adjacent routers (step S58), and whether or not there is a response to each Hello packet. Based on this, the link state of itself is monitored. The adjacent routers are, for example, the second router 6B and the third router 6C in the case of the first router 6A, and the first router 6A, the fourth router 6C, and the third router 6C in the case of the second router 6B. The first router 6A, the fourth router 6D, and the fourth router 6D correspond to the second router 6B and the third router 6C.

  According to the operation sequence at the time of a line failure shown in FIG. 2, for example, when a line failure occurs in the communication line N3 between the first router 6A and the third router 6C, each router creates and updates its own routing table. Is switched to the communication path that bypasses the line failure, and at this time, the path switching information indicating that the communication path has been switched is notified to the first IPGW 10A, which is a lower device of the first router 6A, and the first When the same path switching information is detected on the 1IPGW 10A side, the voice line blocking operation in the first PBX 9A is executed based on the line control data corresponding to the same path switching information. Even if it is switched to the line N4 (backup line), the first IPGW 10A stops assigning the same line to the voice line, Over to data line is preferentially allocating, can the line is reliably prevented a situation becomes impossible is occupied transmitted data to the audio system.

  Next, the operation when a line failure in the network is recovered will be described. 3 and 4 are operation sequences showing the operation of the communication path switching control system 1A when the communication line N3 between the first router 6A and the third router 6C recovers from a line failure.

  The first router 6A, the second router 6B, the third router 6C, and the fourth router 6D periodically distribute Hello packets to adjacent routers even when a line failure occurs, and respond to these Hello packets. Although it has been described that its own link state is monitored based on the presence / absence of a response (see step S58 in FIG. 2), in FIG. 3, the first router 6A connects the communication line N3 between the first router 6A and the third router 6C. When port up (line fault recovery) is detected (step S61), its own link state database is created based on the detection result (failed port information) (step S62).

  The first router 6A, the second router 6B, the third router 6C, and the fourth router 6D execute a link state database interchange operation to reflect the link state database of the first router 6A (step S63). As a result, the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D share the link state database that is created by the first router 6A and that is related to line failure recovery.

  The first router 6A, the second router 6B, the third router 6C, and the fourth router 6D create and update their own routing table based on the common link state database (step S64). In the first router 6A, as shown in FIG. 9, the communication line N1, the communication line N2, and the communication line N3 are directly connected, the communication line N4 is the second router, and the communication line N5 and the communication line N6 are the third router. The routing table, that is, the normal routing table before the line failure is created and updated. As a result, the communication path between the first IPGW 10A and the second IPGW 10B is normal before the line failure, such as the first IPGW 10A → the communication line N1 → the first router 6A → the communication line N3 → the third router 6C → the communication line N6 → the second IPGW 10B. It will be connected back to the root.

  At this time, in FIG. 4, when the routing comparison unit 51 in the CPU 38 of the first router 6A creates and updates the routing table reflecting the line failure recovery through the routine processor 37, the normal routing table 35 and the normal stored in the router side RAM 35 are obtained. The current routing table is compared (step S71).

  When the routing comparison unit 51 determines that there is no comparison difference, the switching information notification unit 52 in the CPU 38 determines that the routing table has returned to the normal route and indicates that the line failure has been recovered. Is prepared on the routing processor 37 side to notify the first IPGW 10A (step S72).

  The routing processor 37 converts the path switching information into an IP packet and a MAC frame, and notifies the first IPGW 10A of the path switching information (step S73).

  When the switching information detection unit 61 in the MPU 38 in the first IPGW 10A detects the route switching information via the PHY 23, the switching information detection unit 61 returns the same route switching information to the first router 6A to indicate that it has responded to the same route switching information ( Step S74), the same path switching information is notified to the line control unit 62.

  The line control unit 62 in the MPU 22 searches the GW-side RAM 12 for line control data corresponding to the path switching information for line fault recovery, and controls the ODCNT 20 to control the first PBX 9A based on the searched line control data. (Step S75).

  The ODCNT 20 turns off the SS command based on the line control data, and executes the voice line blocking release operation on the first PBX 9A (step S76).

  Based on the line control of the ODCNT 20 in the first IPGW 10A, the first PBX 9A releases the line block of the telephone terminal 8A to enable the transmission operation of the designated channel of the same line (step S77).

  Then, the first router 6A, the second router 6B, the third router 6C, and the fourth router 6D periodically distribute Hello packets to adjacent routers (step S78), and whether or not there is a response to each Hello packet. Based on this, the link state of itself is monitored.

  According to the operation sequence at the time of line failure recovery shown in FIGS. 3 and 4, for example, when the line failure of the communication line N3 between the first router 6A and the third router 6C is recovered, each router stores its own routing table. The connection is switched back to the communication path before the line failure by creating and updating, but at this time, the path switching information indicating that the communication path has been switched back before the line failure is transmitted to the lower router of the first router 6A. When the first IPGW 10A notifies the first IPGW 10A and detects the same path switching information on the first IPGW 10A side, the voice line blockage release operation in the first PBX 9A is executed based on the line control data corresponding to the same path switching information. Therefore, it is possible to switch back to the original communication path before recovery from the line failure.

  According to the present embodiment, the switching information notification unit 52 for notifying the first IPGW 10A of the path switching information related to the switched communication path when the switching connection is made to the searched communication path in order to bypass the line failure. 6A, when the first IPGW 10A detects the route switching information from the switching information notification unit 52, the first IPGW 10A includes the line control unit 62 that controls the first PBX 9A based on the route switching information. By recognizing a communication path that bypasses a line failure from one router 6A, for example, various line control operations related to the line failure can be executed on the first PBX 9A.

  According to the present embodiment, when the path switching information is detected, the first PBX 9A is line-controlled to block the first PBX 9A based on the path switching information. Even if the line is switched, the assignment of the first PBX 9A to the voice line of the same line is stopped and the priority is assigned to the data line, so that the line is occupied by the voice system and data cannot be transmitted. Can be reliably prevented.

  According to the present embodiment, when switching back to the communication path before the line failure is made in response to the line failure recovery, the first router 6A notifies the first IPGW 10A of the path switching information related to the communication path that has been switched back. When the first IPGW 10A detects the path switching information related to the communication path that is switched back, the line control state of the first PBX 9A is returned to the line control state before the line failure based on the path switching information. When the line failure is recovered, the line control state before the line failure can be automatically restored.

  In the above embodiment, for example, when the switching information detecting unit 61 in the first IPGW 10A detects the path switching information indicating that the communication path has been switched at the time of a line failure, the first PBX 9A corresponding to this path switching information On the other hand, the line control data for blocking the voice line is read from the GW-side RAM 12, and the first PBX 9A is line-controlled based on the read line control data. However, the communication use related to the voice line of the line is used for the first PBX 9A. Needless to say, the allowable amount may be narrowed, and various line controls may be considered.

  In the above-described embodiment, for example, the communication path is switched at the time of a line failure, or the path switching information indicating that the line failure has been recovered and the communication path has been switched back is notified. The location and the line restoration location may be notified together. In this case, the line failure location and the line failure restoration location can also be recognized on the first IPGW 10A side.

  In the above embodiment, for example, the switching information notification unit 52 in the first router 6A notifies the path switching information to the first IPGW 10A that is a lower-level device of the first router 1A. However, only the first IPGW 10 In addition, it is possible to notify other devices other than the router, and it goes without saying that various measures are possible.

  In the above embodiment, when the line failure is recovered, the connection is switched back to the communication path before the line failure recovery. However, even if the line failure is recovered, the connection is switched to another communication path. However, it goes without saying that the same effect can be obtained.

  According to the communication path switching control system of the present invention configured as described above, when switching connection is made to the searched communication path so as to bypass the line failure, the path switching information related to the switched communication path is transmitted to the gateway device. A switching information notification means for notifying is provided in the router device, and the gateway device has a line control means for controlling the communication device based on the route switching information when the route switching information is detected from the switching information notification means. Therefore, the gateway device uses a router that can execute various line control operations related to the line failure, for example, on the communication device by recognizing the communication path that bypasses the line failure from the router device. Useful for communication networks.

It is a block diagram which shows schematic structure inside CPU inside a 1st router and MPU inside 1st IPGW which are the principal parts of the communication path switching control system which shows embodiment of this invention. It is an operation | movement sequence which shows simply the processing operation of the communication path switching control system at the time of the failure generation concerning this Embodiment. It is an operation | movement sequence which shows simply the processing operation of the communication path | route switching control system at the time of the failure recovery concerning this Embodiment. It is an operation | movement sequence which shows simply the processing operation of the communication path | route switching control system at the time of the failure recovery concerning this Embodiment. It is a block diagram which shows schematic structure of the whole common communication path switching control system. It is a block diagram which shows schematic structure inside the 1st router and 1st IPGW which are the principal parts of a general communication path | route switching control system. It is a functional block diagram which shows schematic structure inside the routing processor in the 1st router in connection with a general communication path switching control system. It is explanatory drawing which shows the communication path at the time of normal in connection with a general communication path switching control system. It is explanatory drawing which shows directly the routing table of the 1st router at the time of normality regarding a general communication path | route switching control system. It is an operation | movement sequence which shows the processing operation in the normal time regarding a general communication path | route switching control system. It is an operation | movement sequence which shows the processing operation in the normal time regarding a general communication path | route switching control system. It is explanatory drawing which shows simply the communication path at the time of the failure generation regarding a general communication path switching control system. FIG. 6 is an explanatory diagram simply showing a routing table of a first router when a failure relating to a general communication path switching control system occurs. It is an operation | movement sequence which shows the processing operation at the time of the failure generation regarding a general communication path switching control system.

Explanation of symbols

1A Communication path switching control system 3 IP network
10A 1st IPGW (gateway device)
10B 2nd IPGW (gateway device)
6A First router (router device)
6B Second router (router device)
6C 3rd router (router device)
6D 4th router (router device)
9A 1st PBX (subordinate device which is a communication device)
9B 2nd PBX (subordinate device which is a communication device)
52. Switching information notification unit (switching information notification means)
61 Switching information detector (line control means)
62 Line control unit (line control means)

Claims (8)

A gateway device that accommodates and connects a plurality of communication devices; and a router device that manages a communication interface between the network and the gateway device, and the router device is a communication path in use among a plurality of communication paths in the network. A communication path switching control system that searches for a communication path that bypasses the line fault from the plurality of communication paths, and switches and connects to the searched communication path.
The router device
When switching to the searched communication path, the switching information notification means for notifying the gateway device of the path switching information related to the switched communication path,
The gateway device is
A communication path switching control system comprising line control means for controlling the communication apparatus based on the path switching information when the path switching information is detected from the switching information notification means. The line control means
2. The communication path switching control system according to claim 1, wherein when the path switching information is detected, line control for closing the line of the communication apparatus is performed based on the path switching information. The line control means
2. The communication path switching according to claim 1, wherein when the path switching information is detected, line control is performed based on the path switching information so as to reduce a communication usage allowance of a line used by the communication apparatus. Control system. The route switching information is
The communication path switching control system according to claim 1, 2 or 3, further comprising line fault information indicating the line fault location. The router device
When the line failure is recovered, the connection is switched back to the communication path before the line failure,
The switching information notification means includes
When switching back to the communication path before the line failure and notifying the gateway device of the path switching information related to the communication path that is switched back,
The line control means
When path switching information related to the switchback communication path is detected from the switching information notification means, the line control state of the communication device is returned to the line control state before the line failure based on the path switching information. The communication path switching control system according to claim 1, 2, 3, or 4. While managing the communication interface with the network, and detecting a line failure in the communication path in use among the plurality of communication paths in the network, search for a communication path that bypasses the line failure from the plurality of communication paths, A router device that switches and connects to the searched communication path,
A router apparatus comprising: a path switching information notifying unit that, when switched to the searched communication path, notifies path switching information related to the switched communication path to another apparatus other than the own router apparatus. The route switching information is
7. The router device according to claim 6, further comprising line fault information indicating the line fault location. When the line failure is recovered, the connection is switched back to the communication path before the line failure,
The switching information notification means includes
8. The router according to claim 6, wherein when switching back to the communication path before the line failure is connected, route switching information related to the switched back communication path is notified to a device other than the own router device. apparatus.

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