WO2010121459A1 - Method and system for implementing protection and recovery in automatically switching optical network - Google Patents

Abstract

The invention discloses a method for implementing protection and recovery in an automatically switching optical network (ASON). After configuring the M:N protecting group in the control plane, the method for implementing protection and recovery in control plane is: determining the type of the connection on which the alarm change occurs, based on the alarm correlative information obtained from nodes; performing protection, recovery, return or protection revocation to the working services on the connection based on the alarm correlative information and the type of the connection on which the alarm change occurs. The invention also discloses a system for implementing protection and recovery in ASON. By applying the method and the system, checking if the current configured protecting connection can provide protection to the working services borne on the failed working connections, if yes, then carrying out the protection, and if not, then carrying out the recovery. Thereby the protection process and the recovery process are combined, the instant break time of the services can be shortened to millisecond degree, and the real-time efficient service protection is provided.

Description

 Method and system for realizing protection and recovery in automatic switched optical network

Technical field

 The present invention relates to optical network technology, and more particularly to a method and system for implementing protection and recovery in an automatically switched optical network.

Background technique

 With the rapid growth of IP services, the demand for network bandwidth is not only getting higher and higher, but also due to the uncertainty and unpredictability of IP traffic itself, the dynamic allocation of network bandwidth is becoming more and more urgent. A new network concept that automates network connectivity—automated switched optical networks have emerged. Automatically Switched Optical Network (ASON) refers to an automatic switched transport network applied to the Synchronous Digital Hierarchy (SDH) transport network defined by G.803 and the optical transport network defined by G.872. . ASON consists of three planes: the transfer plane, the control plane, and the management plane.

 ASON is one of the main modes of intelligent optical networks. The ASON mode can make full use of existing network resources and reduce the cost of intelligent optical networks, which is used by many telecom operators.

 The main advantage of ASON is that it can provide mesh network recovery, that is, a grid of interlaced vertical and horizontal, no layer, all nodes of the entire network can be interconnected, and any damage to the network has no effect, that is, when the connection fails, According to the current network topology, a new route is re-selected from the network resource between the service source node and the destination node, a new connection is established, and the service is switched from the original connection to the new connection for transmission and reception.

 ASON is not only compatible with the protection of traditional optical networks, but also introduces a control plane to bring changes to the implementation of protection switching. Although the optical communication industry at home and abroad has gradually discovered the necessity of the specific implementation of the newly added control plane to participate in protection in ASON, the corresponding research has begun. The protection strategies in the existing protection and recovery schemes are mainly aimed at the traditional Multiplex segment protection mechanisms of the transport plane, such as 1+1 linear multiplex section protection, 1: N linear multiplex section protection, M:N linear multiplex section protection, two-fiber bidirectional multiplex section shared protection ring, and four-fiber bidirectional The multiplex section shares a guard ring.

ASON is different from traditional optical networks. The newly added control plane in ASON can participate in insurance. The implementation of the protection switching function can be implemented by the control plane configuration and by the transmission plane. For example, the protection mode of the M:N protection group provided by the ASON control plane, that is, the successfully established M+N strips The connection of the bearer service that meets the requirements is configured to configure the M-connections of the control plane to be the protection connection for the protection service, and the N connections except the M are configured to carry the working connection of the work service. MN, M is the number of protected connections, and N is the number of working connections. The working service and the protection service are classified according to the degree of importance. The level of the working service is higher than the level of the protection service, and the protection of the low-level protection service is carried. The connection is preferentially occupied by the work service carried on the faulty work connection, and the high-level work service takes priority over the protection connection. If one of the N working connections carrying the service service fails, the protection connection carrying the low-level protection service can be preempted to continue to transmit the work service carried on the faulty working connection, if the N service is carried. When several working connections fail at the same time, the work service is ranked according to the high and low levels of the work services carried by the faulty work connections, wherein the high-level work service preferentially preempts the protection connection to continue to transmit the faulty work connection. Business, in order to achieve the protection of the faulty work connection in order of the rank of the work business from high to low.

 It can be seen that the newly added control plane participating in the protection switching function in the existing ASON is also limited to the implementation by the control plane and executed by the transmission plane, and the service short-time time is only up to the second level.

Summary of the invention

 In view of this, the main purpose of the present invention is to provide a method and system for implementing protection and recovery of ASON, which solves the problem that the prior art ASON only targets the transmission plane, and does not combine protection and recovery for the characteristics of the control plane itself, in ASON. The problem of slow protection and recovery.

 In order to achieve the above object, the technical solution of the present invention is achieved as follows:

 A method for implementing protection and recovery in an automatic switched optical network, wherein an M:N protection group is configured in the control plane of the automatic switched optical network ASON, where M is the number of protection connections, and N is the number of working connections. , the method includes:

The working service carried on the N working connections in the M:N protection group is configured to have a recovery attribute and a reply attribute, and the protection service carried on the M protection connection is configured as an unprotected attribute and a non-recovery attribute, and Determining the type of connection that generates the alarm change; extracting protection, or restoring, or replying, or protecting the revocation of the work service on the connection according to the alarm related information and the connection type that generated the alarm change; thereby controlling the ASON in the automatic switched optical network Protection and recovery on the plane.

 In the foregoing solution, the step of extracting protection, or restoring, or replying, or protecting the revocation of the work service according to the alarm related information and the connection type that generates the alarm change may include:

 Judging according to the alarm related information collected by the node and the connection type that generates the alarm change: If the working connection generates an alarm, the work service carried on the working connection is protected or restored;

 If the alarm on the working connection disappears, reply to the work service carried on the working connection before the fault;

 If an alarm is generated on the protection connection, the protection of the work carried on the protection connection is revoked;

 If the alarm on the protection connection disappears, the work carried on the faulty working connection is protected.

 The step of determining a connection type that generates an alarm change may include:

 The service source node determines, according to the received advertisement message, the nodes at both ends of the connection where the alarm change occurs, and then determines, according to the configuration, whether the connection type of the connection is a working connection or a protection connection.

 The method further includes: detecting, before the step of determining a connection type that generates an alarm change, whether the alarm is changed, and the detecting step is performed as follows:

 The advertisement message sent by the node to the service source node includes the status of the connection between the nodes, and the service source node determines whether an alarm change is detected according to the received advertisement message.

 The alarm related information is obtained by using a notification message of the resource reservation protocol RSVP between the service source node and the node.

 In the foregoing solution, the step of protecting or restoring the work service carried on the working connection may include:

Check whether the currently configured protection connection can provide the work service carried on the faulty working connection. Protection, if provided, performing a protection operation on the work service carried on the faulty work connection, and switching the work service carried on the faulty work connection to the currently configured protection connection; if not, the faulty work connection is prohibited. The protection function of the working service carried in the M:N protection group, and then restarting the work service carried on the faulty working connection, and reselecting a new route from the service source node and the destination node according to the current network topology. The established new connection is used as the recovery connection to determine whether the recovery is successful. If the recovery is successful, the current process is terminated. If the recovery fails, the protection function of the work service carried in the faulty working connection in the M:N protection group is enabled, and then Re-judge whether the protected connection provides protection; and/or,

 The steps of replying to the work service carried on the work connection before the failure may include:

 Check whether the protection service is performed on the working service carried on the working connection. If the operation is performed, perform the operation of revoking the switching of the work carried on the working connection, and then re-switch the service from the protection connection to the original working connection; If it is not executed, check whether the work service exists on the recovery connection. If it does not exist, terminate the current process. If it exists, perform the service reply operation on the recovery connection, and then switch the work service from the recovery connection to the original work connection. On, then enable the protection function of the work service carried on the working connection in the M:N protection group; and / or,

The step of performing protection revocation on the protection service carried in the protection connection may include: determining whether the other connection is carried on the protection connection, and if not, ending the current process; The work service performs the operation of revoking the switchover, and then switches the work carried on the protection connection to the original work connection, and then determines whether there is still an alarm on the original work connection. If not, the current process ends; if it exists, check the current Whether the configured protection connection can provide new protection for the work service carried on the faulty working connection. If yes, perform protection operations on the work service carried on the faulty work connection, and switch the work service carried on the faulty work connection to the current configuration. Protection connection; if not, prohibit the protection function of the work service carried on the faulty working connection in the M:N protection group, and then start recovery for the work service carried on the faulty working connection, according to the current network topology from the service source node Between the target node and the destination node Select a new connection to establish a new connection as a recovery connection, and determine whether the recovery is successful. If the recovery is successful, the current process is terminated. If the recovery fails, enable the protection function of the working service carried on the failed working connection in the M:N protection group. , and then continue to check the current configuration of the protection company Whether the connection can provide new protection for the work service carried on the faulty working connection; and/or the step of protecting the work service carried on the faulty work connection may include: Checking whether the working connection exists in the M:N protection group The fault, if it exists, performs a protection operation on the work service carried on the faulty work connection, and switches the work service carried on the faulty work connection to the protection connection. If not, the current process ends.

 In the foregoing solution, the step of checking whether the currently configured protection connection can provide protection for the work service carried on the faulty working connection may include:

 Determine whether the protection connection is idle. If it is idle, the protection connection can provide protection. If it is not idle, continue to determine whether the service carried on the protection connection is a protection service or a work service. If the service carried on the protection connection is a protection service, the connection is protected. If the service carried on the protection connection is a work service, continue to compare the priority of the work service carried on the faulty work connection with the protection connection, if the work service carried on the faulty work connection has a higher priority than the protection connection. If the priority of the work service is carried, the protection connection can provide protection. If the priority of the work service carried on the faulty working connection is lower than the priority of the work service carried on the protection connection, the protection connection cannot provide protection.

 The invention also provides a system for implementing protection and recovery in an automatic switched optical network, comprising: a change determining unit, configured to determine whether an alarm change is detected according to the alarm related information, and when the alarm is detected, the trigger type Judging unit

 a type judging unit configured to determine a connection type that generates an alarm change;

 The processing unit is configured to perform protection, or recovery, or reply, or protection revocation of the work service on the connection according to the alarm related information and the connection type that generates the alarm change.

 In the foregoing solution, the type determining unit may include: a connection type determining unit and an alarm type determining unit, where the processing unit may include: a work generating alarm processing unit, a work alarm disappearing processing unit, a protection generating alarm processing unit, and a protection alarm disappearing Processing unit, wherein

 The connection type judging unit is configured to determine the connection type in which the alarm change occurs, and provide the alarm type determining unit;

The alarm type determining unit is configured to determine whether the alarm is generated or the alarm disappears. When the working connection generates an alarm, the work in the processing unit is triggered to generate an alarm processing unit, and when the working connection alarm disappears, the alarm is generated. The working alarm disappearing processing unit in the processing unit triggers the protection in the processing unit to generate an alarm processing unit when the protection connection generates an alarm, and triggers the protection alarm disappearing processing unit in the processing unit when the protection connection alarm disappears;

 The work generation alarm processing unit is configured to protect or restore the work service carried on the faulty work connection;

 The work alarm disappearing processing unit is configured to reply to the work service carried before the fault on the working connection;

 The protection generation alarm processing unit is configured to perform protection cancellation for the work service carried on the corresponding protection connection;

 The protection alarm disappearance processing unit is configured to protect the work service carried on the faulty working connection.

 The system can further include:

 And a collecting unit, configured to collect alarm related information of the connection of the service source node carrying the service from the node.

 It can be seen from the technical solution of the present invention that when the alarm is determined to be generated on the working connection, the working service carried on the corresponding fault working connection is protected or restored, and when it is determined that the alarm on the working connection disappears, the corresponding fault is determined. The solution for replying to the work service carried on the previous work connection combines the protection and recovery methods of the control plane. Compared with the prior art, the service instantaneous time of the recovery mode service alone is the second level, and the service can be used. The short-circuit time is reduced to milliseconds, providing real-time, efficient protection for the business. BRIEF abstract

 1 is a schematic flow chart of a method for implementing control plane protection and recovery in ASON according to the present invention;

 Figure 2 is a schematic diagram of the ASON topology of the configured 1:2 protection group;

 Figure 3 is a schematic diagram of the ASON topology of the working connection W1 failure in the configured 1:2 protection group and the recovery connection of the W1;

FIG. 4 is a diagram of a needle generated when the network element A detects an alarm generated on the working connection W1 in the ASON of the present invention. A schematic diagram of the process of protecting or restoring the work service carried on the faulty working connection W1; FIG. 5 is a schematic diagram of the ASON in the ASON in which the alarm is lost on the working connection W1 when the alarm is lost on the working connection W1. Schematic diagram of the process of replying the work service; Figure 6 is a schematic diagram of the ASON topology of the working connection W1 fault in the configured 1:2 protection group, the protection connection P failure, and the recovery connection R1 of W1;

 7 is a schematic diagram of a process for protecting and revoking a work service carried on a corresponding protection connection when the network element A detects an alarm generated on the protection connection P in the ASON of the present invention;

 FIG. 8 is a schematic diagram of a process for protecting a work service carried on a faulty working connection when the network element A detects that the protection link on the P is lost in the ASON of the present invention;

 FIG. 9 is a schematic diagram of a system for implementing control plane protection and recovery in ASON according to the present invention. Preferred embodiment of the invention

In ASON, the connection that carries the protection service is the protection connection, and the connection that carries the work service is the work connection. For the control plane protection recovery method in ASON, you need to meet the following preconditions: The MSON protection group is configured in the ASON control plane, where M is the number of protection connections and N is the number of working connections, where M: The protection services carried on the M protection connections in the N protection group are configured as unprotected and no recovery attributes. The work services carried on the N working connections in the M:N protection group are configured with recovery attributes and reply attributes. The configuration is because the working service is of a high level, and the working connection that carries the working service is not easily preempted. When the working connection is faulty and the alarm is generated, it is determined that the protection connection is available, and the working service carried on the faulty working connection occupies the protection connection. If the protection connection is available, the service is switched to the recovery connection. A recovery connection refers to a new connection established by reselecting a new route from the network resource between the service source node and the destination node according to the current network topology when the working connection fails and the protection connection is unavailable. Protection and recovery are defined as follows: Protection refers to replacing a failed resource with a pre-allocated backup resource. Recovering refers to using the free capacity re-selection path to replace the failed connection according to the current actual usage of the network. The pre-allocated backup resource refers to the M protection connections configured in the M:N protection group in the ASON control plane. After the alarm disappears, the work service can be switched back from the recovery connection to the original working connection. The reply attribute is now configured. When the protection connection is faulty, the protection connection of the protection service is easily preempted by the service service because the protection service level is low. Therefore, it is not necessary to protect or recover the protection service carried on the protection connection in the actual application. Therefore, the solution of the present invention The protection and recovery of the protection business will not be considered. The source endpoint of the connection where the bearer service is located is the service source node, and the destination end of the connection where the bearer service is located is the destination node.

 1 is a schematic flow chart of a method for implementing control plane protection recovery in ASON according to the present invention.

 As shown in Figure 1, the specific implementation steps of the control plane protection recovery method in ASON are as follows:

 S1: The service source node is responsible for collecting alarm related information of the connection carrying the service on the service source node from each node by using a Notify message;

 Resource reservation protocol (RSVP, Resource) between each node in ASON and the service source node

The Notify message of the Reservation Protocol is communicated. Therefore, the service source node can learn the status of the connection between the nodes through the Notify message sent by other nodes, such as normal, fault, and fault disappearing.

 If the connection between the nodes fails, the node where the faulty connection is located reports the alarm to the service source node through the Notify message, and provides alarm related information to the service source node. The service source node classifies the alarm related information of the node where the faulty connection is collected by the node through the Notify message that is exchanged with other nodes, and learns which faults occur between the nodes, so as to perform subsequent processing. Correspondingly, after the connection between the nodes returns to normal, the corresponding node also reports the alarm to the service source node through the Notify message, and the service source node can also learn to restore the normal connection through the Notify message interacting with other nodes. Node.

 S2: determining, according to the alarm related information obtained from each node, whether an alarm change is detected, if yes, proceeding to step S3; if not, continuing to execute S1;

The Notify message sent by the node to the service source node includes the status of the connection between the nodes, such as normal, fault, fault disappearing, etc. Therefore, the change of the state will cause the alarm to change, and the service source node can determine whether according to the received Notify message. An alarm change was detected. For example, if the connection between the nodes changes from normal to failure, the connection will be transferred to the alarm. If the connection between the nodes disappears from the fault to the fault, the alarm will be transferred until the alarm disappears. If the generated alarm or alarm disappears for the same connection multiple times, the service source node can be regarded as not detecting the alarm change. S3-S5: The service source node determines the connection type of the alarm change according to the alarm related information collected from each node. If the connection where the alarm change occurs is a working connection, go to step S6; if the alarm change occurs, the connection is a protection connection. , then go to step S9;

 When an M:N protection group is configured in the ASON control plane, the connection between the two nodes is either configured as a working connection or configured as a protection connection. Therefore, the service source node determines, according to the received Notify message, the two ends of the connection where the alarm change occurs. The node, according to the configuration, can determine the connection type of the connection.

 S6: The service source node determines whether the alarm is generated or the alarm disappears according to the alarm related information collected from each node. If an alarm is generated on the working connection, it indicates that the working connection is faulty, then the process goes to S7; if the alarm on the working connection disappears, It indicates that the fault on the corresponding working connection has disappeared, go to S8;

 S7: When an alarm is generated on the working connection, the working service carried on the corresponding working connection is protected or restored.

 S8: When the alarm on the working connection disappears, reply to the work service carried on the working connection before the corresponding fault;

 S9: The service source node determines whether the alarm is generated or the alarm disappears according to the alarm related information collected from each node. If an alarm is generated on the protection connection, it indicates that the protection connection is faulty, then the process goes to S10; if the alarm on the protection connection disappears, It indicates that the fault on the corresponding protection connection has disappeared, turn to S11;

 S10: When an alarm is generated on the protection connection, the protection service is cancelled for the work carried on the corresponding protection connection;

 S11: The alarm on the protection connection disappears, and the work carried on the faulty working connection is protected.

 The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

2 is an ASON topology diagram of the 1:2 protection group when the number of protection connections M in the M:N protection group is 1. When the number of working connections N is 2. The protection connection P in the 1:2 protection group, as shown by the dotted line in the figure, the protection service carried on it is the service with no protection attribute and no recovery attribute. The two work connections are Wl, W2, and the connection W1 is as shown by the line in the figure. Show, connect W2 as shown by the dotted line in the figure, even The work service carried on W1 and W2 is a service with a recovery attribute and a reply attribute. The path to protect connection P is: AZ; The path of working connection W1 is: ABCZ; The path of working connection W2 is: ADEZ. 3 is an ASON topology diagram of the working connection W1 failure in the 1:2 protection group configured in FIG. 2. Restore connection R1 as shown by the double-dashed line in the figure, the path to restore connection R1 is: ABZ.

 FIG. 4 is a flowchart of protection recovery generated by the network element A detecting an alarm generated on the working connection W1.

 Referring to FIG. 1 , FIG. 2 and FIG. 3 , the specific steps of the protection recovery of the ASON control plane are as shown in FIG. 4 when the service source node, that is, the A-side network element detects the alarm-related information generated on the working connection. Show:

 Steps 101 to 102: Referring to S1 to S6 shown in FIG. 1, the A-side network element communicates with the Node B, C, D, E, and Z using the RSVP Notify message, and the alarm related information is detected in the Notify message. B, C notifies the A-side network element to generate an alarm through the Notify message, and the A-side network element generates the alarm according to the information generated by the node: 6, C, and determines that the working connection W1 generates an alarm between the B and the C node;

 Step 103: Check whether the currently configured protection connection can provide protection for the work service carried on the faulty working connection W1. If yes, go to step 104; if not, go to step 105;

 The specific implementation of checking whether the currently configured protection connection can provide protection for the work service carried on the faulty working connection W1 is as follows: First, whether the protection connection P is idle, if it is idle, it indicates that the protection connection P can provide protection, go to step 104; If it is not idle, it is determined whether the service carried on the protection connection P is a protection service or a work service. If the protection service is carried on the connection P, the protection connection P can provide protection, if the service carried on the protection connection P is a work service. Then, the priority of the work service carried on the faulty working connection W1 and the protection connection P is continuously compared. If the priority of the working service on the faulty working connection W1 is higher than the priority of the working service on the protected connection P, the protection connection is protected. P can provide protection. The working service carried on the faulty working connection W1 can occupy the protection connection P, and the process proceeds to step 104. If the priority of the working service carried on the faulty working connection W1 is lower than the priority of the working service carried on the protection connection P, Then the protection connection P can not provide protection, turn 105;

The priority of setting the working service in the present invention is higher than the priority of the protection service. Therefore, the working service carried on the faulty working connection can preempt the protection connection of the bearer protection service. Step 104: If the protection connection P can provide protection for the work service carried on the faulty working connection W1, perform a protection operation on the work service carried on the faulty working connection W1, and switch the working service carried on the faulty working connection W1 to the protection connection. On the P, the current process is terminated. Step 105: If the protection connection P cannot provide protection for the work service carried on the faulty working connection W1, the protection of the work carried on the faulty working connection W1 in the 1:2 protection group is prohibited. Function, that is, the work service carried on the faulty working connection W1 cannot be switched to any other protection connection during the prohibition period, so as to avoid performing other protection during the recovery process, and the execution is confusing, go to step 106;

 Step 106 107: Start recovery of the work service carried on the faulty working connection W1, and re-select a new connection established by the new route from the network resource between the A network element and the destination node Z according to the current network topology as a recovery connection. If the recovery is successful, if the recovery is successful, the recovery connection R1 is established, as shown by the chain double-dashed line in Figure 3, and the work service carried by the fault work connection W1 is switched to the recovery connection R1, and the current process is ended; Failed, no new route is found to establish a new connection, go to step 108;

 Step 108: Enable the faulty working connection. The working service carried on the W1 is protected in the 1:2 protection group. That is, the working service carried on the faulty working connection W1 can be switched to other protection connections, and then go to step 103.

 FIG. 5 is a flowchart of protection recovery when the network element A detects that the alarm on the working connection W1 disappears. Referring to FIG. 1 , FIG. 2 and FIG. 3 , the specific steps of the protection recovery of the ASON control plane are shown in FIG. 5 when the service source node, that is, the A-side network element detects that the alarm on the working connection disappears. :

 Steps 201 to 202: Referring to S1 to S6 shown in FIG. 1, the A-side network element communicates with the Node B, C, D, E, and Z using the RSVP Notify message, and the alarm related information is detected in the Notify message. B, C notifies the A-side NE alarm disappearing through the Notify message, and the A-side network element comes from the Node B and C according to the information that the alarm disappears, and determines that the alarm is lost between the Node B and the C.

Step 203: Perform a protection operation on the work service carried on the working connection W1 according to the stored linked list. If the work is performed, the work service carried by the working connection W1 is switched to The protection connection P, go to step 204; if not, go to step 205;

 Step 204: The work service carried on the working connection W1 performs the protection operation, that is, the work carried on the W1 is switched to the protection connection P, and the operation of the previously carried work on the working connection W1 is performed, and the operation of the undo switching is performed. The work service is re-switched from the protection connection P to the work connection W1, and the current process is ended;

 Step 205: The working service carried on the working connection W1 has not performed the protection operation, that is, the working service carried on the working connection W1 is not switched to the protection connection P, and it is checked whether the working service is restoring the connection R1, if any, Go to step 206; if it does not exist, end the current process; Step 206: Perform a recovery service R1 on the work service reply operation, the work service from the recovery connection R1 and then switch to the work connection W1, go to step 207;

 Step 207: Enable the working function of the working service carried on the W1 in the 1:2 protection group. That is, the working service carried on the working connection W1 can be switched to other protection connections, and then the current process is terminated.

 Figure 6 is the A1 topology diagram of the working connection W1 failure in the 1 : 2 protection group configured in Figure 2, the protection connection P failure, and the recovery connection R1 of the working connection W1. The path to restore the connection R1 is: A-B-Z.

 FIG. 7 is a flowchart of protection recovery generated by the network element A detecting an alarm generated on the protection connection P.

 Referring to FIG. 1 , FIG. 2 and FIG. 6 , the specific steps of the protection recovery of the ASON control plane are as shown in FIG. 7 when the service source node, that is, the A-side network element detects the alarm-related information generated on the protection connection. Show:

 Steps 301-302: Referring to S1~S5 and S9 shown in FIG. 1, the A-side network element communicates with the Node B, C, D, E, and Z using the RSVP Notify message, and detects the alarm-related information in the Notify message. The node Z notifies the A-side network element to generate an alarm through the Notify message, and the A-side network element generates the alarm according to the information generated by the node Z, and determines that the protection connection P generates an alarm between the A and the Z node; Step 303: Determine the protection Whether the connection P carries other work services, if not, terminates the current process; if it is, then proceeds to step 304;

Step 304: Perform an operation of revoking the switching of the work carried on the protection connection P, and then switch the work carried on the protection connection P to the original working connection, that is, the protection connection P is carried over. If the work service is from which work connection, the work service is still switched to the work connection, where the work connection is W1, and then go to step 305;

 Step 305: Step 301 302, the A network element determines whether there is still an alarm on the working connection W1 according to the information from the nodes B and C. If yes, go to step 306; if not, end the current process;

 Step 306: Check whether the currently configured protection connection can provide new protection for the work service carried on the faulty working connection W1. If yes, go to step 307; if not, go to step 308; check whether the currently configured protection connection can be The specific implementation of providing a new protection for the work service carried on the faulty working connection W1 is as follows: First, whether the currently configured protection connection is idle, if it is idle, it indicates that the currently configured protection connection can provide protection, go to step 307; if not idle, Continue to determine whether the service carried on the protection connection is a protection service or a work service. If the service carried on the protection connection is a protection service, the protection connection can provide protection. If the service carried on the protection connection is a work service, continue to compare the faulty work connection. The priority of the working service is carried by the W1 and the protection connection. If the priority of the working service on the faulty working connection W1 is higher than the priority of the working service on the protection connection, the protection connection can provide protection and the work carried on the faulty working connection. Business can occupy Protect the front connection configuration, proceed to step 307, if the work W1 on the work for connection bearer priority of the service is lower than the protection connection bearer priority of the service work, the protection connection does not provide protection, proceed to step 308;

 Step 307: Perform a protection operation on the working service carried by the faulty working connection W1, and switch the working service carried on the faulty working connection W1 to the currently configured protection connection, and end the current process;

 Step 308: If the currently configured protection connection cannot provide protection for the work service carried on the faulty working connection W1, at this time, the protection function of the work service carried on the faulty working connection W1 in the 1:2 protection group is prohibited, that is, the prohibition period The work service carried on the faulty working connection W1 cannot be switched to any other protection connection, so as to avoid other protection during the recovery process, and the execution is confusing, and then go to step 309;

Step 309 310: Start recovery of the work service carried on the faulty working connection W1, and re-select a new connection established by the new route from the network resource between the A network element and the destination node Z as the recovery connection according to the current network topology. , to determine whether the recovery is successful, if the recovery is successful, ie Establish a recovery connection R1, as shown by the double-dotted line in Figure 6, and switch the work service carried on the faulty working connection W1 to the recovery connection R1, and end the current process; if the recovery fails, no new route is found to establish a new Connection, go to step 311;

 Step 311: Enable the protection function of the working service carried in the faulty working connection W1 in the 1:2 protection group, that is, the working service carried on the faulty working connection W1 can be switched to the currently configured protection connection, and then the step is changed. 306.

 FIG. 8 is a flowchart of protection recovery when the network element A detects that the alarm on the protection connection P disappears. Referring to FIG. 1 , FIG. 2 and FIG. 3 , the specific steps of the protection recovery of the ASON control plane are as shown in FIG. 8 when the service source node, that is, the A-side network element detects that the alarm on the protection connection disappears:

 Steps 401-402: Referring to S1~S5 and S9 shown in FIG. 1, the A-side network element communicates with the Node B, C, D, E, and Z using the RSVP Notify message, and detects the alarm-related information in the Notify message. The node Z notifies the A-side NE alarm to disappear through the Notify message, and the A-side network element comes from the node Z according to the information that the alarm disappears, and determines that the alarm is lost between the A-side network element and the destination node Z.

 Step 403: Check whether there is a fault in the working connection in the 1:2 protection group. If yes, go to 404. If it does not exist, end the current process.

 Step 404: Perform a protection operation on the working service carried by the faulty working connection W1, and switch the working service carried on the faulty working connection W1 to the protection connection P to end the current process.

 FIG. 9 is a schematic diagram of a system for implementing control plane protection and recovery in ASON of the present invention.

 As shown in Fig. 9, the system of the present invention is composed of a collecting unit 11, a change judging unit 12, a type judging unit 19, and a processing unit 20.

 Based on the above system, a method for implementing protection and recovery in an automatic switched optical network in conjunction with the present invention of FIG. 1 is described:

The collecting unit 11 is configured to collect the alarm related information of the connection of the service source node carrying the service from each node, and provide the change related to the change determining unit 12, and the change determining unit 12 is configured to determine, according to the alarm related information, whether the alarm change is detected. When the alarm change is detected, the trigger type determining unit 19, Specifically, the connection type judging unit 13 in the trigger type judging unit 19; the type judging unit 19 is configured to determine a connection type that generates an alarm change; and the processing unit 20 is configured to connect to the connection type according to the alarm related information and the alarm type. The work of the business draws protection, or recovery, or reply, or protection is revoked.

 The type judging unit 19 includes a connection type judging unit 13 and an alarm type determining unit.

14. The processing unit 20 includes a work generation alarm processing unit 15, a work alarm disappearance processing unit 16, a protection generation alarm processing unit 17, and a protection alarm disappearance processing unit 18. The connection type judging unit 13 is configured to determine the connection type in which the alarm change occurs, and is provided to the alarm type determining unit 14; the alarm type determining unit 14 is configured to determine whether the alarm is generated or the alarm disappears, and the processing unit 20 is triggered when the working connection generates an alarm. The work generation alarm processing unit 15 triggers the work alarm disappearance processing unit 16 in the processing unit 20 when the work connection alarm disappears, and the protection generation alarm processing unit 17 in the trigger processing unit 20 when the protection connection generates an alarm, when the protection connection alarm disappears The protection alarm disappearing processing unit 18 in the trigger processing unit 20 is triggered. The work generating alarm processing unit 15 is configured to protect or restore the work service carried on the corresponding working connection; the work alarm disappearing processing unit 16 is configured to reply to the work service carried before the fault on the corresponding working connection; The unit 17 is configured to perform protection cancellation on the work service carried on the protection connection. The work alarm disappearance processing unit 18 is configured to protect the work service carried on the faulty work connection. For the specific implementation of the internal operation of the alarm processing unit 15, refer to the process described in FIG. 4 . For the specific implementation of the internal operation of the alarm processing unit 16 , refer to the process described in FIG. 5 , and the specific implementation of the protection generation alarm processing unit 17 is shown in FIG. 7 . The described flow, the specific implementation inside the work alarm disappearing processing unit 18, is shown in the flow described in FIG.

 The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

It can be seen from the technical solution of the present invention that when the alarm that is determined to be the working connection disappears, the working service carried on the corresponding fault working connection is protected or restored, and when it is determined that the alarm on the working connection disappears, the corresponding fault is determined. The solution for replying the work service carried on the previous work connection combines the protection and recovery methods of the control plane, which is simpler than the prior art. With the business interruption time of the recovery mode service, the service transient time can be shortened to milliseconds, providing real-time and efficient protection for the service.

Claims

Claim

 A method for implementing protection and recovery in an automatic switched optical network, wherein an M:N protection group is configured in the control plane of the automatic switched optical network ASON, where M is the number of protection connections, and N is a working connection. The number of the methods includes:

 The working service carried on the N working connections in the M:N protection group is configured to have a recovery attribute and a reply attribute, and the protection service carried on the M protection connection is configured as an unprotected attribute and a non-recovery attribute;

 Determining the type of connection that generates the alarm change; extracting protection, or restoring, or replying, or protecting the revocation of the work service on the connection according to the alarm related information and the connection type that generated the alarm change; thereby controlling the ASON in the automatic switched optical network Protection and recovery on the plane.

The method according to claim 1, wherein said step of extracting protection, or recovering, or replying, or protecting the revocation of the work service on the connection based on the alarm related information and the type of connection in which the alarm is changed comprises:

 Judging according to the alarm related information collected by the node and the connection type that generates the alarm change: If the working connection generates an alarm, the work service carried on the working connection is protected or restored;

 If the alarm on the working connection disappears, reply to the work service carried on the working connection before the fault;

 If an alarm is generated on the protection connection, the work carried on the protection connection is protected;

 If the alarm on the protection connection disappears, the work carried on the faulty working connection is protected.

 3. The method of claim 1 wherein said determining the type of connection that generated the alert change comprises:

 The service source node determines, according to the received advertisement message, the nodes at both ends of the connection where the alarm change occurs, and then determines, according to the configuration, whether the connection type of the connection is a working connection or a protection connection.

4. The method of claim 1, the method further comprising: determining to generate an alert change Before the step of the connection type, it is detected whether there is the alarm change, and the detecting step is performed as follows:

 The advertisement message sent by the node to the service source node includes the status of the connection between the nodes, and the service source node determines whether an alarm change is detected according to the received advertisement message.

 The method according to claim 1, wherein the alarm related information is obtained by using a notification message of a resource reservation protocol RSVP between a service source node and a node.

 6. The method according to claim 2, wherein

 The step of protecting or restoring the work service carried on the working connection includes: checking whether the currently configured protection connection can provide protection for the work service carried on the faulty work connection, and if available, the bearer for the fault work connection The work service performs a protection operation, and the work service carried on the faulty work connection is switched to the currently configured protection connection; if not, the work service carried on the faulty work connection is prohibited in the M:N protection group. The protection function, and then restarts the work service carried on the faulty working connection, and re-selects a new connection established between the service source node and the destination node according to the current network topology as a recovery connection, and determines whether the recovery is successful. If the recovery is successful, the current process is terminated; if the recovery fails, the protection function of the work service carried in the faulty working connection in the M:N protection group is enabled, and then it is determined whether the protection connection can provide protection; and/or,

 The step of replying to the work service carried on the working connection before the fault includes: checking whether the protection service carried on the working connection is performed, and if executed, performing the revocation of the work service carried on the working connection The operation of switching, re-switching the service from the protection connection to the original working connection; if not, checking whether the work service exists on the recovery connection, if not, ending the current process, if yes, performing a recovery connection On the service reply operation, the work service is switched from the recovery connection to the original working connection, and then the protection function of the work service carried on the working connection in the M:N protection group is enabled; and/or,

The step of performing protection revocation on the protection service carried in the protection connection includes: determining whether the other connection service is carried on the protection connection, and if not, ending the current process; if the bearer, the work carried on the protection connection The service performs the operation of canceling the switching, and then re-switches the work carried on the protection connection to the original working connection, and then judges the original work. Whether the alarm still exists on the connection. If it does not exist, the current process is terminated. If it exists, check whether the currently configured protection connection can provide new protection for the work carried on the faulty working connection. If yes, the bearer is connected to the faulty working connection. The work service performs the protection operation, and the work service carried on the faulty work connection is switched to the currently configured protection connection; if not, the protection function of the work service carried in the faulty work connection in the M:N protection group is prohibited, and then The work service carried on the faulty work connection is started and restored. According to the current network topology, a new connection established by reselecting a new route between the service source node and the destination node is used as the recovery connection, and the success is restored. If the recovery is successful, the process ends. Current process; If the recovery fails, enable the protection function of the working service carried on the faulty working connection in the M:N protection group, and then continue to check whether the currently configured protection connection can provide new protection for the work service carried on the faulty working connection. ; and / or,

 The step of protecting the working service carried on the faulty working connection includes: checking whether there is a fault in the working connection in the M:N protection group, and if so, performing a protection operation on the working service carried on the faulty working connection, and the fault is working. The work service carried on the connection is switched to the protection connection. If it does not exist, the current process ends.

 7. The method according to claim 6, wherein

 The steps of checking whether the currently configured protection connection can provide protection for the work service carried on the faulty working connection include: determining whether the protection connection is idle, and if it is idle, the protection connection can provide protection; if not idle, continuing to determine the protection connection If the service carried on the protection connection is a protection service, the protection connection can provide protection. If the service carried on the protection connection is a work service, continue to compare the faulty work connection with the protection connection. The priority of the work service carried, if the priority of the work service carried on the faulty work connection is higher than the priority of the work service carried on the protection connection, the protection connection can provide protection, if the work service carried on the faulty work connection If the priority is lower than the priority of the work service carried on the protection connection, the protection connection cannot provide protection.

 8. A system for implementing protection and recovery in an automatically switched optical network, comprising:

a change judging unit, configured to determine, according to the alarm related information, whether an alarm change is detected, and when detecting an alarm change, triggering a type determining unit; a type judging unit configured to determine a connection type that generates an alarm change;

 The processing unit is configured to perform protection, or recovery, or reply, or protection revocation of the work service on the connection according to the alarm related information and the connection type that generates the alarm change.

 The system according to claim 8, wherein the type judging unit comprises a connection type judging unit and an alarm type determining unit, and the processing unit includes a work generating alarm processing unit, a work alarm disappearing processing unit, and a protection generating alarm processing unit. And a protection alarm disappearing processing unit, wherein

 The connection type determining unit is configured to determine a connection type in which an alarm change occurs, and provide the alarm type determining unit to the alarm type determining unit;

 The alarm type determining unit is configured to determine whether the alarm is generated or the alarm is lost. When the working connection generates an alarm, the work generating alarm processing unit in the processing unit is triggered, and the working connection alarm is triggered to trigger the The working alarm disappearing processing unit triggers the protection generating alarm processing unit in the processing unit when the protection connection generates an alarm, and triggers the protection alarm disappearing processing unit in the processing unit when the protection connection alarm disappears;

 The work generation alarm processing unit is configured to protect or restore the work service carried on the faulty work connection;

 The work alarm disappearing processing unit is configured to reply to the work service carried before the fault on the working connection;

 The protection generation alarm processing unit is configured to protect the work service carried on the protection connection;

 The protection alarm disappearing processing unit is configured to protect the work service carried on the faulty working connection.

 10. The system of claim 8 or 9, further comprising:

 And a collecting unit, configured to collect alarm related information of the connection of the service source node carrying the service from the node.