WO2010038624A1 - 通信システム、ノード装置、通信システムの通信方法、およびプログラム - Google Patents
通信システム、ノード装置、通信システムの通信方法、およびプログラム Download PDFInfo
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- WO2010038624A1 WO2010038624A1 PCT/JP2009/066237 JP2009066237W WO2010038624A1 WO 2010038624 A1 WO2010038624 A1 WO 2010038624A1 JP 2009066237 W JP2009066237 W JP 2009066237W WO 2010038624 A1 WO2010038624 A1 WO 2010038624A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/028—Dynamic adaptation of the update intervals, e.g. event-triggered updates
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- the present invention relates to a communication system, a node device, a communication method thereof, and a program in consideration of network failure recovery.
- Failure recovery refers to switching a route from a failed active path to a backup path when a failure such as a link disconnection or a node failure occurs.
- a typical example of failure recovery technology is 1: 1 protection. Since 1: 1 protection does not flow data on the backup path when it is normal, it is attracting attention as a method that can effectively use the bandwidth when considering the current situation in which the amount of data transmission in the network is increasing.
- a part of the backup path may be shared by multiple operational paths. As shown in FIG. 1, the protection path 1 'of the working path 1 and the protection path 2' of the working path 2 share the link CF on the same channel. In this case, if a failure occurs on the working path 1 or 2, a part of the protection path is shared by a plurality of working paths, so that a node on the protection path needs to set the path of the protection path.
- the node on the working path that detected the failure notifies the sending end node of the working path that a failure has occurred.
- the transmitting end node that has received the notification signal transmits a switch setting request signal to the receiving end node of the working path along the protection path for the working path where the failure has occurred.
- the node that has received the switch setting request signal switches the switch along the protection path.
- the receiving end node of the active path that has received the switch setting request signal lastly switches the switch so that data can be received on the protection path, and transmits a switch switching completion signal along the protection path to the transmitting end node of the operating path.
- the transmission end node of the working path that has received the switch switching completion signal determines that preparation for flowing data to the backup path is complete because switch switching has been completed in all nodes except the transmission end node on the backup path. Therefore, the transmission end node of the working path switches the switch from the working path to the protection path, and flows data to the protection path. This completes the failure recovery operation.
- Patent Document 1 discloses a technique in which a node on an operation path that detects a failure transmits a failure notification signal by flooding for high-speed failure recovery.
- flooding means sending a packet to all nodes adjacent to a certain node.
- the node that has received the failure notification signal holds information on all the working paths in the network and the backup paths corresponding to the working paths.
- the node that has received the notification signal determines from the failure notification signal and the path information whether the node is on the protection path corresponding to the failed active path. And the received failure notification signal is flooded.
- the received failure notification signal is flooded without switching the switch.
- the switch is set with the failure notification signal from the node that has detected the failure, and finally the transmission end node on the protection path receives the failure notification signal by flooding. Then, the failure recovery operation is completed when the transmitting end node on the protection path switches the switch to the protection path.
- each node performs switch switching with a failure notification signal transmitted by flooding from the node that detected the failure before the transmission end node of the operation path receives the notification signal, high-speed failure recovery is possible.
- a node that detects a failure refers to a path table, selects a detour route, and sends a switching request to an upstream branch node via the detour route for fast failure recovery. It is possible.
- Patent Document 3 when the selected backup path passes through the same route as the operated path, the node detecting the failure does not directly send the failure notification upstream, but the downstream node of the overlapping route Is instructed to send a failure notification.
- a node on the operation path that detects a failure transmits a failure notification signal by flooding, and a node that receives the failure notification signal also transmits a failure notification signal by flooding.
- the transmitting end node on the operation path receives the failure notification signal earlier in time than the other nodes on the backup path depending on the network configuration.
- the transmission end node of the working path switches the switch to the protection path, and the data flows to the protection path.
- the switch setting is not completed at a certain node on the protection path, and the data is not transmitted to the desired destination.
- data is transmitted to an unexpected destination. This becomes a big problem in consideration of security.
- Patent Documents 2 and 3 merely select a route for detouring the link in which a failure has occurred, and are considered with respect to the number of hops from the transmission end node used after failure recovery. Not.
- the present invention has been made in view of the above problems, and an object of the present invention is to reduce the number of hops from the transmitting end node used after failure recovery as much as possible and to perform failure recovery at high speed and accurately.
- a communication system is a communication system having a plurality of node devices having path switching means for switching data transmission paths, and the node apparatus performs a first transmission in which data transmission is performed.
- Fault detection means for detecting a fault on the path, and if the fault is in the link or node immediately before itself, from the sending end node in the first transmission path to the sending end node excluding the path to the node that detected the fault Transmission path setting means for setting the second transmission path, first failure notification means for transmitting a failure notification signal to the transmitting end node via the second transmission path, and new data transmission upon receipt of the failure notification signal
- New route switching means for switching the data transmission switch so that the route of the failure notification signal is the same route as the failure notification signal, and the transmission end node sends the failure notification signal
- signal switches the switch to the second transmission path characterized in that it comprises a data transmission means for performing a new data transmission via the second transmission path, the.
- the transmission route setting means is characterized by setting with reference to a route stored in advance.
- a failure detection signal transmitting means for transmitting a failure detection signal to a downstream node on the overlapping transmission path.
- a second failure notification means for transmitting a failure notification signal via the second transmission path is provided.
- Storage means for storing path information of the third transmission path used when there is a failure in the link immediately before the receiving end node on the first transmission path, and the transmission path setting means has the fault of its own Storage means so that the transmission path from the transmitting end node in the first transmission path to the transmitting end node excluding the path from the transmitting end node in the first transmission path is shared with the third transmission path when it is in the immediately preceding link or node
- the second transmission path is set with reference to the path information stored in.
- the node device is a node device at a transmitting end that performs data transmission.
- the node device switches a switch along the path that has received the failure notification signal, and performs data transmission that performs new data transmission. And.
- a failure detecting means for detecting a failure on the first transmission path performing data transmission and a failure is detected from the transmitting end node in the first transmission route when the failure is in a link or node immediately before itself.
- Transmission path setting means for setting a second transmission path to the transmission end node excluding a path to the node, and first failure notification means for transmitting a failure notification signal to the transmission end node via the second transmission path;
- a new path switching means for switching a data transmission switch so that the path of the new data transmission is the same as the path of the fault notification signal when the fault notification signal is received.
- the transmission route setting means is characterized by setting with reference to a route stored in advance.
- a failure detection signal transmitting means for transmitting a failure detection signal to a downstream node on the overlapping transmission path.
- a second failure notification means for transmitting a failure notification signal via the second transmission path.
- Storage means for storing path information of the third transmission path used when there is a failure in the link immediately before the receiving end node on the first transmission path, and the transmission path setting means has the fault of its own Storage means so that the transmission path from the transmitting end node in the first transmission path to the transmitting end node excluding the path from the transmitting end node in the first transmission path is shared with the third transmission path when it is in the immediately preceding link or node
- the second transmission path is set with reference to the path information stored in.
- the communication method of the communication system includes a failure detection step for detecting a failure on the first transmission path performing data transmission, and a first when the failure is in a link or node immediately before itself.
- a transmission path setting step for setting a second transmission path from the transmitting end node in the transmission path to the transmitting end node excluding the path from the node where the fault is detected; and a fault to the transmitting end node via the second transmission path
- a first failure notification step for transmitting a notification signal, and a new route switching step for switching the data transmission switch so that the route for the new data transmission is the same as the transmission route for the failure notification signal when the failure notification signal is received.
- the switch is switched to the second transmission path, and the new data transmission is performed via the second transmission path. Characterized in that it comprises a step, a.
- the transmission route setting step is characterized by setting with reference to a route stored in advance.
- a failure detection signal transmission step of transmitting a failure detection signal to a downstream node on the overlapping transmission path is provided.
- a second failure notification step of transmitting a failure notification signal via the second transmission path is provided.
- a storage unit that stores path information of a third transmission path that is used when there is a failure in the immediately preceding link of the receiving end node on the first transmission path; Stored in the storage unit so that the transmission path from the transmitting end node in the first transmission path to the transmitting end node except the path from the transmitting end node in the first transmission path is shared with the third transmission path when the link or node exists
- the second transmission route is set with reference to the route information thus obtained.
- the program according to the present invention is characterized by causing a computer to execute the communication method of the communication system described above.
- the number of hops to be used after failure recovery is made as small as possible by selecting a detour route from the transmitting end node in the transmitting route to the transmitting end node excluding the route from the node detecting the failure. This makes it possible to perform fault recovery quickly and accurately.
- FIG. 5 is a flowchart obtained by adding new operation path setting confirmation and setting operations to the flowchart of FIG. 4. It is the flowchart figure which showed the operation example of the node which detected the failure. It is an example of the packet of a failure notification signal. It is the flowchart figure which showed the operation example when the node on a new operation path receives a failure notification signal.
- FIG. 2 is a diagram illustrating an example of a network diagram. Nodes A to I exist in this network, and a plurality of links are connected to each node.
- FIG. 2 shows a case where there is a failure between CF.
- FIG. 3 is a block diagram of a node in the network.
- the node 1 includes a control unit 10, a path information management unit 11, and a data signal switching unit 12.
- the control unit 10 handles a control signal, and includes a failure detection unit 101, a packet generation unit 102, a packet analysis unit 103, a routing unit 104, and a switching control unit 105.
- the route information management unit 11 manages information on the working path and the new working path used when a failure occurs.
- the data signal switching unit 12 handles data signals.
- the failure detection unit 101 detects a failure, the packet generation unit 102 generates a control signal packet, and the packet analysis unit 103 analyzes the packet.
- the routing unit 104 outputs the packet to the output destination of the packet, and the switching control unit 105 controls switching of the data signal switching unit 12.
- FIG. 4 is a flowchart showing an operation example in the network when a failure occurs.
- the downstream node adjacent to the failure location detects the failure in Step 1020.
- the downstream node adjacent to the failure location is a node immediately after the location where the failure occurred on the operation path.
- step 1030 the node that has detected the failure generates a failure notification signal, transmits the failure notification signal along the set new operation path, and finally, in step 1040, the transmission end node of the operation path. Receives the failure notification signal.
- the new working path is a path from the failure detecting node to the transmitting end node, excluding the path where the failure is detected on the working path.
- this is a route to the transmission end node set by the failure detection node bypassing the failure detection location.
- the route of the new working path may be the shortest route excluding the working path route upstream of the failure detection node, and until the third embodiment, the shortest route from the failure detection node to the transmitting end node excluding the failure point. This will be described as a route.
- FIG. 5 is a flowchart in the case of confirming the setting of the new working path.
- Step 1010 When a failure occurs in the operation path such as link disconnection or node failure in Step 1010, the downstream node adjacent to the failure location detects the failure in Step 1020.
- step 1021 it is determined whether a new working path for the working path has already been set. If a new working path has not been set, the route from the failure detection node to the sending end of the working path is set in step 1022, and if a new working path has been set, a fault is detected as it is.
- the node generates a failure notification signal and transmits the failure notification signal along the set new operation path.
- the transmission end node of the operation path finally receives the failure notification signal. Receive.
- FIG. 6 is a flowchart showing an operation example in the node that detects the failure.
- the node on the operation path detects the loss of the control signal in the failure detection unit 101 in the control unit 10.
- the node that has detected the failure refers to the path information management unit 11, and in step 1130 recognizes the operational path that has failed.
- step 1140 it is determined whether a new working path for the working path has already been set. If no new working path is set, the failure detection node searches for the shortest path from the failure detection node to the transmission end node of the working path, and sets a new working path in step 1141. Here, in the search, the path of the operation path upstream of the failure detection node is excluded.
- step 1150 the packet generation unit 102 in the failure detection node generates a failure notification signal packet along the new working path.
- a failure notification signal packet is transmitted.
- FIG. 7 shows a failure notification signal packet generated in the network of FIG.
- the information in the packet is set along the new operation path so that the node F that has detected the failure is the transmission source, and the node A is the destination via the node E and the node B. Specifically, the routing unit 104 routes the packet toward the node through which the packet is routed.
- the routing unit 104 of the failure detection node F routes the packet toward the destination node E. Also, at the same time as sending the packet of the failure notification signal, the failure detection node uses the switching control unit 105 to change the input port of the data signal switching unit from the port to which the operation path signal is input to the port to which the new operation path signal is input. Switch to.
- the failure notification signal is sequentially transmitted from the node that detects the adjacent failure to the transmission end node of the operation path along the new operation path, each node switches at the stage of receiving the failure notification signal. Switching is possible. Therefore, the operation from the operation path to the data signal switching from the new operation path can be performed quickly and accurately.
- the configuration in this embodiment is the same as that in the first embodiment.
- FIG. 8 is a flowchart showing an operation example when a node on the new operation path receives a failure notification signal.
- step 2010 when the node on the new operation path receives the failure notification signal, the packet analysis unit 103 analyzes the packet of the failure notification signal, and recognizes in step 2020 that it is a failure notification signal. At the same time, it recognizes the input port and output port of the packet.
- step 2030 the packet analysis unit 103 sets the input port and output port of the data signal switching unit 12 through the switching control unit 105 in the direction opposite to the transmission direction of the control packet.
- FIG. 9 shows node A on the new operation path, the adjacent node relationship of node A, and the received control packet.
- the node A is not related to the node A in FIG.
- the control packet recognizes that it is a failure notification signal, and recognizes that the input port of the packet is connected to the node X and the output port is connected to the node Y as indicated by the dotted line.
- the data signal input port is connected to the node Y and the output port is connected to the node X so as to be opposite to the transmission direction of the control packet as indicated by the bold line.
- FIG. 10 is a sequence diagram in the network in the present embodiment. That is, the node F that has failed in the previous link and detected the failure in step 2110 sets a new working path in step 2120, transmits a failure notification signal in step 2130, and returns to step 2140. Switch.
- the node E that has received the failure notification signal transmits the failure notification signal to the node B in step 2150, and switches the switch so as to be in the reverse direction in step 2160.
- the node B transmits a failure notification signal to the node A that is the transmitting end node, and switches the switch in step 2180.
- the transmitting end node A that has received the failure notification signal triggers the failure notification signal reception as a trigger to switch the switch in step 2190 and newly transmit data in step 2200.
- the failure can be recovered quickly and accurately.
- the nodes on the new working path sequentially switch ports, so that when the sending end node on the working path finally receives the failure notification signal, the sending end node is excluded.
- Setting of the data signal switching unit has been completed in all nodes of the new operation path.
- the transmitting end node can immediately perform data transmission on the new operation path by transmitting new data with the reception of the failure notification signal as a trigger. Therefore, it is possible to perform failure recovery at high speed and accurately.
- a new working path is set from a node that detects an adjacent failure, there is a possibility that a part of the new working path overlaps with the route of the working path as shown in FIG. Therefore, in this embodiment, a new working path is set so that paths do not overlap from the viewpoint of effective use of bandwidth. Note that the configuration in this embodiment is the same as that in the first embodiment.
- FIG. 12 is a flowchart showing an operation example in the network when a failure occurs in the third embodiment. Until the new operation path is set (steps 3010 to 3031), the process is the same as in the first embodiment.
- the node that detects the failure determines whether a part of the new working path overlaps with the path of the working path. If there is no overlap, the failure detection node generates a failure notification signal in step 3041, and transmits the failure notification signal along the set new operation path in step 3042, as in the first embodiment. .
- the node that detected the failure does not transmit data using the new working path as it is, and in step 3050, the working path is not used.
- a failure detection signal is transmitted to the downstream node on the new operation path that overlaps with.
- a failure notification signal is transmitted along the new operation path from a node where a part of the new operation path does not overlap with the route of the operation path, and the transmission end node of the operation path is notified of the failure notification signal. Receive. As a result, it is possible to switch the data signal transmitted to the operation path to the new operation path.
- FIG. 13 shows the flow of the operation path, new operation path, failure notification signal, and failure detection signal.
- node C detects a failure
- a part of the new working path overlaps with the working path as shown in FIG. 11, so a failure detection signal is transmitted to node F, which is a downstream node of node C.
- node F since a part of the new working path does not overlap with the working path, a fault notification signal is transmitted along the new working path, and node A, which is the sending end node of the working path, finally reports a fault. Receive a signal.
- FIG. 14 is a flowchart showing an operation example of a node that detects a failure in the third embodiment. Up to the setting of the new working path (steps 3110 to 3141) is the same as in the first embodiment.
- the node that detects the failure refers to the route information management unit 11 in the node, and in step 3150, determines whether a part of the new working path overlaps with the route of the working path. Check. If there is no overlap, as in the first embodiment, in step 3151, the packet generation unit 102 in the failure detection node generates a failure notification signal packet along the new operation path, and after the packet is generated In step 3152, the routing unit 104 sends a failure notification signal packet.
- step 3160 the packet generation unit 102 in the failure detection node generates a failure detection signal packet.
- the routing unit 104 transmits a packet of a failure detection signal.
- FIG. 15 is a diagram illustrating an example of a failure detection signal packet generated in step 3170. This is based on the operation path of FIG. 13, and the information in the packet is transmitted so that the node C that detects the failure is the transmission source and is transmitted to the nodes F and H that are downstream nodes. Is set. It should be noted that information on the operation path that has failed may be set in the packet.
- FIG. 16 is a flowchart showing an operation example of the downstream node that has received the failure detection signal.
- the downstream node that has received the failure detection signal analyzes the packet of the failure detection signal in the packet analysis unit 103, recognizes that it is a failure detection signal in step 3210, and sets the path information management unit 11 in step 3220.
- the path information management unit 11 and the fault detection signal are recognized from the fault detection signal.
- the node that has received the failure detection signal continues to refer to the route information management unit 11 and determines in step 3240 whether or not a new working path has already been set from its own node. If the new working path is not set, the node that has received the failure detection signal searches for the shortest route from the node that has received the failure detection signal to the transmitting end node of the working path, and sets the new working path in step 3241. To do.
- the route information management unit 11 is referred again to determine whether or not a part of the new working path overlaps with the working path route. If they do not overlap, the packet analysis unit 103 discards the failure detection signal packet, and in step 3151 the packet generation unit 102 generates a failure notification signal packet along the new operation path. Then, the routing unit 104 sends out a failure notification signal packet.
- the packet analysis unit 102 transmits the packet of the failure detection signal to the routing unit 104, and in step 3260, the routing unit 104 transfers the packet to the transfer destination.
- the routing unit 104 transfers the packet to the transfer destination. For example, in FIG. 15, when the node F receives the failure detection signal and a part of the new operation path from the node F overlaps the route of the operation path, the failure detection signal is transferred to the node H. become.
- the bandwidth used for the new working path can be saved. It is possible to effectively use the bandwidth of the network.
- the purpose of this embodiment is to reduce the bandwidth used for the new operation path by a method different from that of the third embodiment.
- FIG. 17 shows two new operation paths (new operation path 1 and new operation path 2) with respect to the operation path.
- the new working path 1 and the new working path 2 are configured with different paths.
- Such a phenomenon may occur when the route of the new working path 1 is the shortest route excluding the working path route upstream of the failure detection node.
- the new operating path 2 can share the same route in the new operating path 1 and the new operating path 2 as shown in FIG. 18, there is a possibility that the bandwidth can be used effectively. is there.
- the route information management unit 11 of the intermediate node on the working path holds the route information of the new working path 1 used when the receiving end node of the working path detects a failure.
- the route information of the new working path 1 used when the node H detects a failure in FIG. 18 is held by the route information management unit 11 of the intermediate nodes C and F on the working path.
- the shortest path from the intermediate node on the working path to the intermediate node on the new working path 1 is one of the new working paths 2 from the intermediate node based on the information held by the route information management unit 11.
- the remaining route is shared with the new working path 1.
- the route is shared by the link between the nodes A and B.
- the bandwidth can be effectively used by setting so as to share the route of the new operation path.
- the band can be used more effectively by combining with the third embodiment.
- control unit 11 route information management unit 12 data signal switching unit 101 failure detection unit 102 packet generation unit 103 packet analysis unit 104 routing unit 105 switching control unit
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Abstract
Description
(第1の実施形態)
図2は、ネットワーク図の一例を示す図である。本ネットワーク内には、ノードA~Iが存在し、各ノードには複数のリンクが接続されている。
(第2の実施形態)
次に、新運用パス上のノードが障害通知信号を受信した際の動作について詳細に説明する。なお、本実施形態における構成は、第1の実施形態と同様である。
(第3の実施形態)
隣接の障害を検知したノードから新運用パスを設定する際には、図11に示すように新運用パスの一部が運用パスの経路と重複する可能性がある。そこで、本実施形態では、帯域の有効利用の観点からパスが重複しないように新運用パスの設定を行う。なお、本実施形態における構成は、第1の実施形態と同様である。
(第4の実施形態)
本実施形態では、新運用パスに使用される帯域を第3の実施形態とは異なる手法で低減することを目的とする。
10 制御部
11 経路情報管理部
12 データ信号切替部
101 障害検知部
102 パケット生成部
103 パケット解析部
104 ルーチング部
105 切替制御部
Claims (17)
- データ伝送経路を切り替える経路切替手段を有する複数のノード装置を有する通信システムであって、
ノード装置は、データ伝送を行っている第1の伝送経路上の障害を検知する障害検知手段と、
前記障害が自身の直前のリンク、またはノードにあると前記第1の伝送経路内の送信端ノードから前記障害を検知したノードまでの経路を除く前記送信端ノードまでの第2の伝送経路を設定する伝送経路設定手段と、
前記第2の伝送経路を介して送信端ノードまで障害通知信号を送信する第1の障害通知手段と、
前記障害通知信号を受信すると新規データ伝送の経路が前記障害通知信号の伝送経路と同一の経路になるようにデータ伝送用のスイッチを切り替える新規経路切替手段と、
前記送信端ノードが前記障害通知信号を受信すると前記第2の伝送経路にスイッチを切り替え、前記第2の伝送経路を介して新規データ伝送を行うデータ伝送手段と、を備えることを特徴とする通信システム。 - 前記伝送経路設定手段は、予め記憶されている経路を参照して設定することを特徴とする請求項1記載の通信システム。
- 前記第2の伝送経路が前記第1の伝送経路の一部と重複すると、前記重複する伝送経路上の下流ノードに障害の検知信号を送信する障害検知信号送信手段を備えることを特徴とする請求項1又は2に記載の通信システム。
- 前記検知信号を受信すると、前記第2の伝送経路を介して障害通知信号を送信する第2の障害通知手段を備えることを特徴とする請求項3に記載の通信システム。
- 前記第1の伝送経路上の受信端ノードの直前リンクに障害があった場合に用いられる第3の伝送経路の経路情報を格納する記憶手段と、を備え、
前記伝送経路設定手段は、前記障害が自身の直前のリンク、またはノードにあると前記第1の伝送経路内の送信端ノードから前記障害を検知したノードまでの経路を除く前記送信端ノードまでの伝送経路が前記第3の伝送経路と共有するように前記記憶手段に格納された経路情報を参照して第2の伝送経路を設定することを特徴とする請求項1から4のいずれか1項に記載の通信システム。 - データ伝送を行う送信端のノード装置であって、
障害通知信号を受信すると前記障害通知信号を受信した経路に沿ってスイッチを切り替え、新規データ伝送を行うデータ伝送手段と、を備えることを特徴とするノード装置。 - データ伝送を行っている第1の伝送経路上の障害を検知する障害検知手段と、
前記障害が自身の直前のリンク、またはノードにあると前記第1の伝送経路内の送信端ノードから前記障害を検知したノードまでの経路を除く前記送信端ノードまでの第2の伝送経路を設定する伝送経路設定手段と、
前記第2の伝送経路を介して送信端ノードまで障害通知信号を送信する第1の障害通知手段と、
前記障害通知信号を受信すると新規データ伝送の経路が前記障害通知信号の伝送経路と同一の経路になるようにデータ伝送用のスイッチを切り替える新規経路切替手段と、を備えることを特徴とするノード装置。 - 前記伝送経路設定手段は、予め記憶されている経路を参照して設定することを特徴とする請求項7記載のノード装置。
- 前記第2の伝送経路が前記第1の伝送経路の一部と重複すると、前記重複する伝送経路上の下流ノードに障害の検知信号を送信する障害検知信号送信手段を備えることを特徴とする請求項7又は8に記載のノード装置。
- 前記検知信号を受信すると、前記第2の伝送経路を介して障害通知信号を送信する第2の障害通知手段を備えることを特徴とする請求項9に記載のノード装置。
- 前記第1の伝送経路上の受信端ノードの直前リンクに障害があった場合に用いられる第3の伝送経路の経路情報を格納する記憶手段と、を備え、
前記伝送経路設定手段は、前記障害が自身の直前のリンク、またはノードにあると前記第1の伝送経路内の送信端ノードから前記障害を検知したノードまでの経路を除く前記送信端ノードまでの伝送経路が前記第3の伝送経路と共有するように前記記憶手段に格納された経路情報を参照して第2の伝送経路を設定することを特徴とする請求項7から10のいずれか1項に記載のノード装置。 - データ伝送を行っている第1の伝送経路上の障害を検知する障害検知ステップと、
前記障害が自身の直前のリンク、またはノードにあると前記第1の伝送経路内の送信端ノードから前記障害を検知したノードまでの経路を除く前記送信端ノードまでの第2の伝送経路を設定する伝送経路設定ステップと、
前記第2の伝送経路を介して送信端ノードまで障害通知信号を送信する第1の障害通知ステップと、
前記障害通知信号を受信すると新規データ伝送の経路が前記障害通知信号の伝送経路と同一の経路になるようにデータ伝送用のスイッチを切り替える新規経路切替ステップと、
前記送信端ノードが前記障害通知信号を受信すると前記第2の伝送経路にスイッチを切り替え、前記第2の伝送経路を介して新規データ伝送を行うデータ伝送ステップと、を備えることを特徴とする通信システムの通信方法。 - 前記伝送経路設定ステップは、予め記憶されている経路を参照して設定することを特徴とする請求項12記載の通信システムの通信方法。
- 前記第2の伝送経路が前記第1の伝送経路の一部と重複すると、前記重複する伝送経路上の下流ノードに障害の検知信号を送信する障害検知信号送信ステップを備えることを特徴とする請求項12又は13に記載の通信システムの通信方法。
- 前記検知信号を受信すると、前記第2の伝送経路を介して障害通知信号を送信する第2の障害通知ステップを備えることを特徴とする請求項14に記載の通信システムの通信方法。
- 前記第1の伝送経路上の受信端ノードの直前リンクに障害があった場合に用いられる第3の伝送経路の経路情報を格納する記憶部を備え、
前記伝送経路設定ステップは、前記障害が自身の直前のリンク、またはノードにあると前記第1の伝送経路内の送信端ノードから前記障害を検知したノードまでの経路を除く前記送信端ノードまでの伝送経路が前記第3の伝送経路と共有するように前記記憶部に格納された経路情報を参照して第2の伝送経路を設定することを特徴とする請求項12から15のいずれか1項に記載の通信システムの通信方法。 - 請求項12から16のいずれか1項に記載の通信システムの通信方法をコンピュータに実行させるプログラム。
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US8908502B2 (en) | 2014-12-09 |
US20120099421A1 (en) | 2012-04-26 |
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