JP2006128846A - Network node monitor path restoration method and transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To autonomously restore a node monitor path in case of the occurrence of a fault on the node monitor path to reduce the time of man-hour of restoration work, and to perform node monitoring with the same high reliability as laying of a spare line without extending lines for monitor, in a network node monitor path restoration method and a transmission device. <P>SOLUTION: One of network nodes is defined as a master node, and a plurality of monitor path pattern information 1-2 are preliminarily stored in the master node, and information showing communication states of inter-node interfaces, which is periodically received from slave nodes, is stored in an interface state table 1-1 and is monitored. When a node incapable of communication is detected, a monitor path pattern which doesn't include a path where a fault occurs is selected from the plurality of monitor path pattern information and is delivered to each slave node, and each slave node changes connection setting so that a monitor path is formed in accordance with the monitor path pattern information. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a network node monitoring path restoration method and a transmission apparatus, and is mainly applied to an apparatus for defining a monitoring band and path for monitoring a network node such as a synchronous optical transmission apparatus, and the monitoring path of a network node The present invention relates to a network node monitoring path restoration method and a transmission apparatus for restoring a monitoring path when a transmission failure occurs.

  In the optical synchronous network, the communication means of the supervisory control information for performing notification of the failure of the network node and controlling the failure is composed of the following elements. First, as shown in FIG. 8, a part of the payload part (data part) of an SDH (Synchronous Digital Hierarchy) frame is fixedly used as a node monitoring band, and is used for monitoring separately from other communication bands. Allocate bandwidth. This is to prevent the monitoring band and the main signal band used for the actual service from being affected by each other.

  In addition, in order to use the monitoring bandwidth efficiently, a life value is set for a frame used for communication (hereinafter referred to as a communication frame), and the life value is reduced each time it passes through a node. If the communication frame is discarded, the communication frame is prevented from being permanently transferred in a loop form in the network, thereby preventing congestion and delay of the communication frame due to an excessive amount of communication.

  The communication path (monitoring path) for node monitoring in the network is, for example, a one-stroke or vine-shaped connection path as shown by a broken line in FIG. 9 so as not to form a partial loop path or a large number of branch paths. It is necessary to decide so that As described above, this is for preventing congestion of communication frames due to a loop path or a number of branch paths. Here, the vine-shaped connection route refers to a route connecting nodes without forming a loop-like route or a number of branching routes.

  Next, as means for detecting an optical line abnormality, monitoring data is provided in an area (hereinafter referred to as a user area) that can be arbitrarily defined by the user, such as the K1F1Z1 byte of the SOH (Section Over Head) portion of the SDH frame. There is a technique for detecting anomalies by sending a message and confirming its reception. Conventionally, a node monitoring information communication unit of a network has been configured using these technical elements.

Prior art documents related to the present invention include the following patent documents. In Patent Document 1, a communication frame is transmitted to the same line as the main signal, thereby communicating with a monitoring processor on the network and performing monitoring control. The control method is described. Patent Document 2 below describes an optical loop monitoring device that monitors an optical loop having a plurality of nodes, and that speeds up switching of the optical loop monitoring device system. .
JP 2002-305549 A JP 63-146626 A

  Node monitoring in a conventional optical synchronous network is performed using the above-described technique. When a transmission failure occurs in a node on a monitoring communication path, depending on the failure occurrence location (for example, an optical interface unit, etc.) Many nodes that cannot be monitored are generated, which greatly affects network monitoring.

  In order to cope with the inability to monitor the network node assumed due to such a transmission failure, a line other than the main signal transmission line is prepared for monitoring, and a spare line in which the line is doubled or tripled is prepared. If it is possible, it becomes possible to perform highly reliable network node monitoring. However, introducing a new line for monitoring and laying it incurs a large cost burden.

  If a failure occurs in a node on the monitoring communication path, the action to be performed via the network is to change the connection settings such as changing the time slot for the node adjacent to the node that has become unable to communicate. However, considering the setting of unmonitorable nodes, restore the monitoring route by manually changing the connection settings so that the transmission failure location is bypassed to the adjacent node, or to the node that cannot be monitored On the other hand, it takes a lot of time and man-hours to recover the monitoring route, such as going to the site where the transmission device of the node is installed and changing the setting by connecting the monitoring device directly to the transmission device of the node. It was.

  The present invention drastically reduces the work time and man-hours associated with monitoring path recovery processing by autonomously recovering the monitoring path when a failure occurs in the network node monitoring path. This makes it possible to perform highly reliable node monitoring similar to the case where a backup line is laid without increasing the number of lines.

  The network node monitoring path restoration method of the present invention is as follows: (1) In a network in which each node on the network is connected by a one-stroke or vine-type monitoring path, one of the nodes is set as a master node, The monitoring path pattern information is accumulated, and information indicating the communication state of the inter-node interface is periodically transmitted from the slave node which is another node on the network to the master node through the monitoring path. The information indicating the communication state of the interface between the nodes is monitored, and when a node incapable of communication is detected, the path of the fault occurrence location is included from the plurality of monitoring path pattern information accumulated in the storage unit. No monitoring route pattern is selected, and the selected monitoring route pattern information is selected for each slave node. Distributed to each slave node, and changes the connection configuration of the inter-node interface to form a monitoring path according to the monitoring path pattern information received from the master node.

  The transmission device of the master node according to the present invention includes (2) a storage unit that stores pattern information of a plurality of monitoring paths that connect each node on the network in a single stroke or a pendulum manner, and another node on the network Means for storing information indicating the communication state of the inter-node interface periodically received from the slave node through the monitoring path, and monitoring information indicating each communication state of the inter-node interface, thereby disabling communication. When a detected node is detected, a monitoring path pattern that does not include the path of the failure location is selected from the plurality of monitoring path pattern information accumulated in the storage unit, and the selected monitoring path pattern information is assigned to each slave node. And means for distributing.

  Also, (3) a monitoring path pattern information storage unit that stores pattern information of a plurality of monitoring paths that connect each node on the network in a single stroke or a vine pattern, and a slave node that is another node on the network An interface state table for storing information indicating a communication state of the inter-node interface received through the monitoring path, and monitoring each communication state of the inter-node interface with reference to the interface state table, Means for transmitting a frame for instructing a slave node adjacent to an incommunicable node to perform communication of monitoring information in a user area that can be arbitrarily defined in a header when the detected node is detected; and the storage unit Out of multiple monitoring route pattern information accumulated in the Elected monitoring path pattern that does not include the road, in which a means for distributing the monitoring path pattern information issued 該選 to the slave node.

  Also, the slave node transmission apparatus of the present invention periodically transmits an interface monitoring unit that monitors the communication state of each inter-node interface in its own node and a notification information frame that reflects the monitoring information of the communication state of the inter-node interface. When there is an abnormality in the communication status of the inter-node interface in the local node, or there is an instruction from the master node that is another node on the monitoring route that connects each node in a stroke Created by the failure determination unit and the failure determination unit for instructing a connection setting change to communicate in a user area that can be arbitrarily defined in the header part for an inter-node interface not included in the monitoring path The notification information frame is periodically sent to the master node through the monitoring route. In accordance with an instruction from the notification information transmission unit and the failure determination unit, a connection setting change is performed for communication in a user area that can be arbitrarily defined in the header unit, and a monitoring route is set according to the monitoring route pattern information distributed from the master node. And a device setting unit that changes the connection setting of the inter-node interface to form.

  The network node transmission apparatus according to the present invention includes: (5) a monitoring path pattern information storage unit that stores pattern information of a plurality of monitoring paths that connect each node on the network in a single stroke or a pendulum style; An interface state table for storing information indicating a communication state of an inter-node interface periodically received from the slave node, which is another node, through the monitoring path; and referring to the interface state table, When monitoring each communication state and detecting a node where communication is disabled, the slave node adjacent to the communication disabled node is instructed to communicate monitoring information in a user area that can be arbitrarily defined in the header section. Means for transmitting a frame and a plurality of monitors stored in the storage unit; Means for selecting a monitoring route pattern that does not include the route of the failure location from the route pattern information, and distributing the selected monitoring route pattern information to each slave node, and between each node in the own node An interface monitoring unit that monitors the communication status of the interface and a notification information frame that reflects the monitoring status of the communication status of the inter-node interface are periodically created, and an abnormality in the communication status of the inter-node interface in the local node is detected. When there is an instruction from the master node that is another node on the monitoring path that connects each node in a stroke or a pendulum style, the header part is used for the inter-node interface that is not included in the monitoring path. Instruct user to change connection setting to communicate in user area that can be defined arbitrarily In the header portion according to the instruction of the harm determination unit, the notification information transmission unit that periodically transmits the notification information frame created by the failure determination unit to the master node through the monitoring path, and the failure determination unit A connection setting change for communicating in a user area that can be arbitrarily defined, and a device setting unit for changing the connection setting of the inter-node interface so as to form a monitoring route according to the monitoring route pattern information distributed from the master node. It is a thing.

  According to the present invention, when a failure occurs in a node monitoring route of the network, the master node determines the failure location, newly selects a monitoring route that does not include the failure location, and sets the monitoring route information as a slave node. The monitoring path is automatically restored by setting the connection of the new monitoring path in accordance with the information of the monitoring path in the slave node, so that the maintenance worker's work time and man-hour accompanying the monitoring path restoration work Can be greatly reduced. In addition, the automation of the recovery work can prevent a secondary failure that occurs due to a manual error.

  In addition, by temporarily using an area that can be arbitrarily defined by the user, such as the SDH frame SOH unit, it is possible to switch to an alternative monitoring path without adding a monitoring line. The same reliability as that of the configuration including the protection line can be obtained, and highly reliable node monitoring can be realized at low cost.

  In the present invention, a master node that holds information on the monitoring route on the network is installed. Here, each node in the monitoring path other than the master node is referred to as a slave node. Each slave node has a function of periodically monitoring the communication state of each optical interface in its own node and periodically notifying the master node of the communication state.

  The master node has an interface status table that stores information indicating the communication status of each optical interface from each slave node, and updates the status of each interface in the table in response to a notification from each slave node and retains its contents Keep it. In addition, the master node stores information of a plurality of route patterns in a memory in advance for the node monitoring route in the network.

  The master node monitors the state of the node monitoring path with reference to the interface state table, and when a node in which communication is disabled due to a failure is detected, for a slave node adjacent to the communication disabled node, A frame instructing to perform monitoring communication is transmitted in the user area of the SDH frame SOH part. In addition, in the slave node in which the failure has occurred, the hardware setting is automatically changed to perform monitoring communication using the user area of the SOH unit for the inter-node interface in the own node, and Try to restore the communication.

  The master node selects a monitoring path pattern that does not include the line where the failure occurred from among the plurality of monitoring path pattern information stored in the memory, and puts new monitoring path pattern information in the monitoring communication path established in the above procedure. Distribution is performed, and the network node monitoring is resumed normally by changing the connection setting of the monitoring path according to the information of the new monitoring path pattern in each node.

  The configuration of the network node of the present invention will be described below. FIG. 1 shows the configuration of the master node. The master node includes a storage unit that stores the interface state table 1-1 and the monitoring route pattern information 1-2, a notification information reception unit 1-3, a route state determination unit 1-4, a route information distribution unit 1-5, and a device. A setting information transmission unit 1-6 is provided. The optical interface 1-7 and the line interface 1-8 are provided in common to the master node and the slave node.

  The optical interface 1-7 is an inter-node interface that accommodates an optical line that connects between network nodes. The line interface 1-8 is connected to the communication terminal 1-9 or a local line accommodated in the own node, and is monitored. The device 1-10 is also an interface connected to the line interface 1-8. The notification information receiving unit 1-3 receives the notification information frame extracted from the SDH frame, and sequentially updates the interface state table 1-1 each time the frame is received.

  The route state determination unit 1-4 detects a change in the state information in the interface state table 1-1, searches the monitoring route pattern information 1-2 when the state change is detected, and selects appropriate monitoring route information. The device setting information transmission unit 1-6 transmits an instruction for prompting communication recovery in the user area of the SDH frame SOH unit to the adjacent node of the slave node that has become unable to communicate when a failure occurs, and also distributes route information The unit 1-5 transmits the selected monitoring path information to the entire network using the user area of the SOH unit.

  FIG. 2 shows the configuration of the slave node. The slave node includes an interface monitoring unit 2-1, a failure determination unit 2-2, a notification information transmission unit 2-3, and a device setting unit 2-4. The interface monitoring unit 2-1 monitors the state of each optical interface 2-5 of its own node.

  The failure determination unit 2-2 periodically creates a notification information frame reflecting the state monitoring information from the interface monitoring unit 2-1. In addition, the failure determination unit 2-2 changes the connection setting so that the optical interface that is not included in the current monitoring path is communicated in the user area of the SOH unit from the optical interface 2-5 when the occurrence of the failure is detected. An instruction is given to the device setting unit 2-4.

  The notification information transmission unit 2-3 periodically transmits the notification information frame created by the failure determination unit 2-2 to the master node via the monitoring path. The device setting unit 2-4 changes the connection setting of the optical interface 2-5 according to the recovery monitoring route information transmitted from the master node or according to the automatic setting change instruction from the failure determination unit 2-2 of the own node. To do.

  FIG. 3 shows the configuration of the interface state table managed by the master node. The information stored in the interface state table includes a node number indicating identification information of each slave node on the network, identification information of each optical interface in each node defined for each node (hereinafter also referred to as interface identification information). And communication status information indicating the communication status of the optical interface.

  FIG. 4 shows the data structure of the information frame for notification. The notification information frame includes the node number of the transmission source slave node, identification information of each optical interface in the own node, and communication state information thereof. In the notification information frame, all the interface identification information in the own node and information on their communication state are stored.

  FIG. 5 shows an example of monitoring route pattern information held in advance by the master node. The monitoring path pattern information is information in which interface identification information is arranged in the order of the paths along the node monitoring path of the network, and information on the used bandwidth and life value is stored corresponding to each interface identification information. The monitoring route pattern information shown in FIG. 5 corresponds to the monitoring route shown in FIG.

  It should be noted that the use band information of each optical interface is created so that the setting to use the same use band is performed between the optical interfaces facing each other through the optical line. For example, the interface [3.1] of the node # 3 is opposed to the interface [2.2] of the node # 2 via the optical line, and the same communication slot includes the same time slots (TS) 1000 to 10004. Set the bandwidth.

  The life value information is set for each node, and is also created so that the same life value is set for the optical interfaces facing each other via the optical line. For example, if a life value 6 is set in the node # 3, a life value 6 is set in the interface [3.1], and a life value 5 is set in the node # 2, the interface Life value 5 is set in [2.2] and [2.1]. In the figure, the existing life value in the same node is indicated by “−”, which indicates that it is the same as the life value of the listing.

  An example of the operation of the present invention will be described below with reference to FIG. Here, it is assumed that each node is connected and operated in the form of a network indicated by a solid line in FIG. Further, it is assumed that the monitoring route for monitoring each network node is formed by a route indicated by a broken line in FIG.

  Now, assuming that a line failure has occurred between the node # 4 and the node # 5, the optical interfaces [4.2] and [5. 1] is detected. Thereafter, a notification information frame is created by the failure determination unit 2-2 and transmitted to the master node.

  In the case of the operation example of FIG. 6, the notification information frame from the node # 4 arrives at the master node through the monitoring path, but the notification information frame from the node # 5 can arrive at the master node through the monitoring path. Can not. At the same time, in the nodes # 4 and # 5, the failure determination unit 2-2 performs monitoring communication with the optical interface not included in the current monitoring path by using the user area of the SOH unit. Change connection settings automatically.

  The master node that has received the notification information frame from the node # 4 updates the interface state table 1-1. However, the information frame for notification is not received by the master node from the nodes # 5, # 6, and # 7, and the communication failure of the nodes # 5, # 6, and # 7 is determined by the time-out detection indicating that a predetermined time has elapsed.

  The path status determination unit 1-4 of the master node that detected the incommunicable node is not included in the monitoring path from the interfaces of the nodes # 2 and # 3 adjacent to the incommunicable nodes # 5, # 6, and # 7. An instruction frame for instructing the optical interface [2.3] [3.2] to perform monitoring communication using the user area of the SOH unit is transmitted to the node.

  The nodes # 2 and # 3 that have received the instruction frame change the settings of the optical interfaces [2.3] and [3.2] by using the device setting unit 2-4. This establishes a monitoring communication path between the nodes # 2 and # 5, as indicated by the thick double broken line in FIG. 6B. Between the nodes # 3 and # 6, since there is no setting change for the node # 6 to communicate with the optical interface [6.3] using the user area of the SOH unit, the communication between the nodes # 3 and # 6 is not performed. The route is not established. As a result, the monitoring communication path is temporarily restored as shown in FIG. 6B, so that the master node # 1 can receive the information frame for notification from the nodes # 5, # 6, and # 7. Become.

  The route status determination unit 1-4 of the master node refers to the interface status table 1-1, searches the monitoring route pattern information 1-2 for a monitoring route that does not include the faulty part, and, for example, an alternative monitoring shown in FIG. Among the route pattern information, the monitoring route pattern # 1 is not selected because a failure has occurred between the optical interfaces [4.2] and [5.1], and the monitoring route pattern # 2 indicates that a failure has occurred. Since there is no optical interface, the monitoring route pattern # 2 (that is, the monitoring route shown in FIG. 6C) is selected. The selected monitoring route information is distributed by broadcast communication from the route information distribution unit 1-5 to the entire network.

  Each slave node that has received the monitoring path information determines whether or not each optical interface of its own node is included in the monitoring path, and the device setting unit 2- 4 to change the connection setting of the optical interface. For example, in the node # 6, the connection setting is changed for the optical interface [6.1] [6.2] [6.3] from the interface identification information of the monitoring route pattern # 2 in FIG. A new monitoring path indicated by a broken line in (c) is formed, and thereby network monitoring is restored.

  In the description of the present invention, the configuration of the master node and the configuration of the slave node have been described separately. However, a single network node is configured to have both a master node function and a slave node function, thereby constructing a network. Depending on the situation, one of the network nodes can be appropriately selected as a master node, and the rest can be set as slave nodes to perform network monitoring.

It is a figure which shows the structure of the master node of this invention. It is a figure which shows the structure of the slave node of this invention. It is a figure which shows the structure of the interface state table of this invention. It is a figure which shows the data structure of the information frame for notification of this invention. It is a figure which shows an example of the monitoring path | route pattern information of this invention. It is a figure which shows the operation example of this invention. It is a figure which shows an example of the monitoring route pattern information for substitution of this invention. It is a figure which shows an SDH frame. It is a figure which shows the monitoring path | route in a network.

Explanation of symbols

1-1 Interface Status Table 1-2 Monitoring Route Pattern Information 1-3 Notification Information Receiving Unit 1-4 Route Status Determination Unit 1-5 Route Information Distribution Unit 1-6 Device Setting Information Transmitting Unit 1-7 Optical Interface 1-8 Line interface 1-9 Communication terminal 1-10 Monitoring device 2-1 Interface monitoring unit 2-2 Failure determining unit 2-3 Notification information transmitting unit 2-4 Device setting unit 2-5 Optical interface

Claims (5)

In a network in which each node on the network is connected with a single stroke or an epidemic type monitoring path, one of the nodes is set as a master node, and a plurality of monitoring path pattern information is accumulated in the master node in advance.
From the slave node that is another node on the network, information indicating the communication state of the inter-node interface is periodically transmitted to the master node through the monitoring path,
When the master node monitors information indicating the communication state of the interface between the nodes and detects a node that has become unable to communicate, the route of the fault location is selected from the plurality of monitoring route pattern information accumulated in the storage unit. A monitoring route pattern that does not include, and distributes the selected monitoring route pattern information to each slave node,
A network node monitoring path restoration method, wherein each slave node changes a connection setting of an interface between nodes so as to form a monitoring path according to monitoring path pattern information received from a master node. A storage unit that accumulates pattern information of a plurality of monitoring paths that connect between nodes on the network in a single stroke or a vine pattern;
Means for storing information representing the communication state of the inter-node interface periodically received through the monitoring path from a slave node which is another node on the network;
Monitors information representing each communication state of each inter-node interface, and when a node incapable of communication is detected, includes a path of a fault occurrence location from a plurality of monitoring path pattern information accumulated in the storage unit A master node transmission apparatus comprising: means for selecting an unsupervised monitoring path pattern and distributing the selected monitoring path pattern information to each slave node. A monitoring path pattern information storage unit that accumulates pattern information of a plurality of monitoring paths that connect between nodes on the network in a single stroke or a vine pattern;
An interface state table for storing information indicating a communication state of an inter-node interface periodically received through the monitoring path from a slave node which is another node on the network;
Referring to the interface state table, each communication state of each inter-node interface is monitored, and when a node incapable of communication is detected, it is arbitrarily defined in the header section for a slave node adjacent to the node incapable of communication Means for transmitting a frame instructing to perform communication of monitoring information in a user area capable of;
Means for selecting a monitoring path pattern that does not include the path of the fault location from among the plurality of monitoring path pattern information stored in the storage unit, and delivering the selected monitoring path pattern information to each slave node. A master node transmission apparatus. An interface monitoring unit for monitoring the communication state of the interface between the nodes in the own node;
Periodically create a notification information frame that reflects the monitoring status of the communication status of the inter-node interface, and when an abnormality in the communication status of the inter-node interface in the own node is detected, or write each node in a stroke When there is an instruction from a master node that is another node on the connected monitoring route, communication is performed in a user area that can be arbitrarily defined in the header section for an inter-node interface that is not included in the monitoring route. A failure determination unit for instructing connection setting change;
A notification information transmission unit that periodically transmits the notification information frame created by the failure determination unit to the master node through the monitoring path;
In accordance with the instruction of the failure determination unit, the connection setting is changed to communicate in a user area that can be arbitrarily defined in the header part, and the inter-node interface is configured to form a monitoring path according to the monitoring path pattern information distributed from the master node. A slave node transmission device comprising: a device setting unit for changing connection settings. A monitoring path pattern information storage unit that accumulates pattern information of a plurality of monitoring paths that connect between nodes on the network in a single stroke or a vine pattern;
An interface state table for storing information indicating a communication state of an inter-node interface periodically received through the monitoring path from a slave node which is another node on the network;
Referring to the interface state table, each communication state of each inter-node interface is monitored, and when a node incapable of communication is detected, it is arbitrarily defined in the header section for a slave node adjacent to the node incapable of communication Means for transmitting a frame instructing to perform communication of monitoring information in a user area capable of;
A plurality of monitoring path pattern information accumulated in the storage unit, a monitoring path pattern that does not include the path of the failure location is selected, and the selected monitoring path pattern information is distributed to each slave node, And,
An interface monitoring unit for monitoring the communication state of the interface between the nodes in the own node;
Periodically create a notification information frame that reflects the monitoring status of the communication status of the inter-node interface, and when an abnormality in the communication status of the inter-node interface in the own node is detected, or write each node in a stroke When there is an instruction from a master node that is another node on the connected monitoring route, communication is performed in a user area that can be arbitrarily defined in the header section for an inter-node interface that is not included in the monitoring route. A failure determination unit for instructing connection setting change;
A notification information transmission unit that periodically transmits the notification information frame created by the failure determination unit to the master node through the monitoring path;
In accordance with the instruction of the failure determination unit, the connection setting is changed to communicate in a user area that can be arbitrarily defined in the header part, and the inter-node interface is configured to form a monitoring path according to the monitoring path pattern information distributed from the master node. A network node transmission apparatus comprising: a device setting unit that changes connection settings.

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