WO2024051060A1

WO2024051060A1 - Method and system for cooperative management and control of protection switching of ip and optical networks

Info

Publication number: WO2024051060A1
Application number: PCT/CN2023/070547
Authority: WO
Inventors: 陈丽萍
Original assignee: 烽火通信科技股份有限公司
Priority date: 2022-09-08
Filing date: 2023-01-04
Publication date: 2024-03-14
Also published as: CN115623364A

Abstract

The present invention relates to the field of network management and control, in particular to a method and system for cooperative management and control of protection switching of IP and optical networks. The method comprises: acquiring an initial protection configuration parameter of an IP service and a protection configuration parameter of an optical network, and setting as cooperative protection delay time the sum of the protection delay time of the optical network and the protection switching time of the optical network; determining a protection configuration parameter of the IP service, which is sent to an IP network management and control function, the protection configuration parameter of the IP service comprising the protection delay time and/or the cooperative protection delay time of the IP service; and, when a fault is detected on a source or sink node of the IP service, triggering protection switching according to the protection configuration parameter of the IP service. The present invention can ensure the priority of protection switching of an optical network when an IP service is interrupted due to a fault of the optical network, thereby reducing the number of times of invalid switching of the IP service, and avoiding network instability.

Description

A method and system for collaborative management and control of IP and optical network protection switching

Technical field

The present invention relates to the field of network management and control, and in particular to a method and system for coordinated management and control of IP and optical network protection switching.

Background technique

IP networks and optical networks have always been developed independently in terms of network planning, business configuration, and operation and maintenance. However, in actual networks, a large number of services span IP metropolitan area networks and optical backbone networks. This is precisely because of the independence of IP networks and optical networks. Management and control make the collaboration process between the two cumbersome, resulting in long business planning, deployment and release cycles, as well as high operation and maintenance complexity and high costs. Automatic protection switching is one of the important means to prevent business interruption due to network failures. In the collaborative management and control scenario of IP networks and optical networks, protection coordination across IP networks and optical networks is also an important issue that should be solved.

Normally, both IP networks and optical networks are configured with protection-related parameters, and IP devices or optical devices trigger corresponding protection switching mechanisms based on the configuration parameters of their respective networks. However, due to the lack of collaborative management and control methods for IP network and optical network protection switching, the problem with the existing solution is that when the optical channel path is interrupted, all IP services carried on the optical channel trigger automatic protection switching at the same time, which inevitably results in simultaneous switching of a large number of services. This causes network instability and reduces service quality.

In view of this, how to overcome the shortcomings of the existing technology and solve the inconvenient cooperative management and control during protection switching of IP networks and optical networks is a problem to be solved in this technical field.

Contents of the invention

In view of the above defects or improvement needs of the existing technology, the present invention solves the current problem of inconvenient collaborative management and control during protection switching of IP networks and optical networks.

The embodiments of the present invention adopt the following technical solutions:

In a first aspect, the present invention provides a method for cooperative management and control of IP and optical network protection switching, specifically: obtaining the initial protection configuration parameters of the IP service and the protection configuration parameters of the optical network, and using the protection delay time of the optical network and the protection switching of the optical network The sum of the times is used as the collaborative protection delay time; determine the protection configuration parameters of the IP service sent to the IP network management and control function, and the protection configuration parameters of the IP service include the protection delay time of the IP service and/or the collaborative protection delay time; the IP When the source and sink nodes of the service detect a fault, they trigger protection switching according to the protection configuration parameters of the IP service.

Preferably, obtaining the initial protection configuration parameters of the IP service and the protection configuration parameters of the optical network specifically includes: receiving a creation request message for the IP and optical services, and obtaining the initial protection configuration parameters of the IP service and the optical network from the creation request message. Protection configuration parameters; or receive creation request messages for IP and optical services, obtain the initial protection configuration parameters of the IP service from the creation request message, and obtain the protection configuration parameters of the services/optical channels of the existing optical network.

Preferably, triggering protection switching based on the protection configuration parameters of the IP service specifically includes: verifying the protection delay time of the IP service based on the collaborative protection delay time, and delivering the protection configuration parameters of the IP service to the IP network management and control function, where The protection configuration parameters of the IP service include the protection delay time of the IP service after verification; the IP network management and control function delivers the protection configuration parameters of the IP service to the source and sink nodes of the IP service; when the source and sink nodes of the IP service detect After reaching SF/SD, protection switching of the IP service is triggered based on the verified protection delay time of the IP service.

Preferably, the protection delay time of the IP service is verified based on the collaborative protection delay time, which specifically includes: comparing the collaborative protection delay time value with the protection delay time value of the IP service. When the protection delay time value of the IP service has been configured or defaulted, When it is less than the collaborative protection delay time value, the protection delay time value of the IP service is reset to the collaborative protection delay time value.

Preferably, IP service protection switching is triggered based on the verified IP service protection delay time, which specifically includes: the source and sink nodes of the IP service wait for the verified IP service protection delay time, and then detect SF/SD again; when SF When /SD still exists, IP service protection switching is triggered.

Preferably, verifying the protection delay time of the IP service based on the collaborative protection delay time also includes: obtaining the service priority or the level of the customer to which the service belongs, and determining whether the service needs to be verified for collaborative protection configuration according to the preconfigured policy. Verify the protection delay time of the IP service against the policy-set business or customer; or, carry parameters indicating whether to configure collaborative protection in the received creation request message for IP and optical services, and determine whether the IP service should be configured based on the value of the parameter. The protection delay time is verified.

Preferably, triggering protection switching based on the protection configuration parameters of the IP service specifically includes: delivering the protection configuration parameters of the IP service to the IP network management and control function, where the protection configuration parameters of the IP service include protection delay time and collaborative protection of the IP service. Delay time; the IP network management and control function delivers the protection delay time and collaborative protection delay time of the IP service to the source and sink nodes of the IP service; after the neighboring node of the IP service receives the optical channel failure event, it sends the protection delay time and collaborative protection delay time to the source and sink nodes of the IP service. Send optical network fault indication information; after the source and sink nodes of the IP service detect SF/SD and/or receive the optical network fault indication information, they trigger IP service protection switching based on the protection delay time and collaborative protection delay time of the IP service.

Preferably, the protection switching of the IP service is triggered based on the protection delay time and collaborative protection delay time of the IP service, which specifically includes: when the source and sink nodes of the IP service detect SF/SD and receive optical network fault indication information, the IP service After the source node waits for the collaborative protection delay time, it detects SF/SD again. When SF/SD still exists, it triggers protection switching of the IP service; when the source and sink nodes of the IP service detect SF/SD, but do not receive an optical network failure When indicating information, wait for the protection delay time of the IP service and then trigger the protection switching of the IP service.

Preferably, triggering protection switching according to the protection configuration parameters of the IP service specifically includes: the source and sink nodes of the IP service detect the SF/SD signal indicating a fault, and/or trigger the protection after receiving the optical network fault indication information. Switch.

On the other hand, the present invention also provides a system for collaborative management and control of IP and optical network protection switching, specifically: including a collaborative functional unit, an IP network management and control functional unit and an optical network management and control functional unit. Specifically: the collaborative functional unit is according to the first aspect The provided IP and optical network protection switching collaborative management and control method sends IP service protection configuration parameters including the protection delay time and/or collaborative protection delay time of the IP service to the IP network management and control functional unit; the source and sink nodes of the optical network service/optical channel When a fault is detected, the protection switching of the optical network is completed according to the protection configuration parameters provided by the optical network management and control functional unit; when the source and sink nodes of the IP service still detect a fault after the protection switching of the optical network is completed, the protection switching is completed according to the protection configuration parameters provided by the IP network management and control functional unit. The protection configuration parameters are used to complete the protection switching of the IP network.

Compared with the existing technology, the beneficial effects of the embodiments of the present invention are: through the collaborative configuration of the protection delay time of the IP network and the optical network, it is ensured that the protection switching of the optical network is given priority when the IP service is interrupted due to an optical network failure, thereby reducing the IP service The number of invalid switchings while avoiding network instability. Through the fault identification mechanism across IP networks and optical networks, the source and sink nodes of IP services can accurately detect whether the IP service interruption is caused by optical network or IP network faults when triggering protection switching, and trigger protection switching of IP services on demand.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the drawings required to be used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a flow chart of a method for cooperative management and control of IP and optical network protection switching provided by an embodiment of the present invention;

Figure 2 is a flow chart of another method for collaborative management and control of IP and optical network protection switching provided by an embodiment of the present invention;

Figure 3 is a flow chart of another method for collaborative management and control of IP and optical network protection switching provided by an embodiment of the present invention;

Figure 4 is a flow chart of another method for collaborative management and control of IP and optical network protection switching provided by an embodiment of the present invention;

Figure 5 is a flow chart of another method for collaborative management and control of IP and optical network protection switching provided by an embodiment of the present invention;

Figure 6 is a schematic diagram of a system architecture for collaborative management and control of IP and optical network protection switching provided by an embodiment of the present invention;

Figure 7 is a schematic diagram of an actual implementation scenario of a system for cooperative management and control of IP and optical network protection switching provided by an embodiment of the present invention;

Figure 8 is a timing diagram of a system for collaborative management and control of IP and optical network protection switching provided by an embodiment of the present invention;

FIG. 9 is a timing diagram of another collaborative management and control system for IP and optical network protection switching provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

The present invention is an architecture of a specific functional system. Therefore, in the specific embodiments, the functional logical relationship of each structural module is mainly explained, and the specific software and hardware implementation methods are not limited.

In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in detail below with reference to the drawings and embodiments.

Example 1:

In the current network, the IP network and the optical network trigger protection switching respectively according to their respective protection switching parameters. The protection of IP services includes the protection of service layer tunnels, pseudo wire (Pseudo Wire, abbreviated as PW) protection, etc.; the protection of optical networks includes optical network protection. The protection of network services specifically includes optical channel data unit k (Optical channel data unit-k (k=0,1,2...), abbreviated as ODUk) protection, optical channel (Optical channel, abbreviated as OCh) protection, etc. If the protection delay time of the IP service is less than the time it takes for the optical network to detect a fault and complete the switching, the protection switching process of the IP service triggering the protection switching of the optical network has not yet been completed. For example, the signal failure/signal degradation (SF/SD) signal detected by the source and sink nodes of this IP service may be caused by an optical network failure. After the optical network switching is completed, SF/SD The SD signal will disappear, and there is no need for IP service protection switching. In this case, an invalid IP service protection switching will be caused, resulting in a waste of network resources and reduced service quality.

In actual implementation, nodes can be network elements or network devices based on actual business needs or network architecture.

As shown in Figure 1, the specific steps of the collaborative management and control method for IP and optical network protection switching provided by the embodiment of the present invention are as follows:

Step 101: Obtain the initial protection configuration parameters of the IP service and the protection configuration parameters of the optical network, and use the sum of the protection delay time of the optical network and the protection switching time of the optical network as the collaborative protection delay time.

In actual implementation, the initial protection configuration parameters of the IP service and the protection configuration parameters of the optical network can be obtained when creating the service, including receiving the creation request message of the IP and optical services, and obtaining the initial protection configuration parameters of the IP service from the creation request message. and the protection configuration parameters of the optical network, or obtain the initial protection configuration parameters of the IP service from the creation request message and obtain the existing optical network when it is determined to use the service/optical channel of the existing optical network to carry the IP service Protection configuration parameters of the service/optical channel. Commonly used protection switching configuration parameters usually include protection level, protection type, protection delay time, protection switching time, recovery time, whether to restore to the working path, etc.

In the method provided in this embodiment, in order to reduce invalid switching of IP services, the IP services need to wait for the protection switching of the optical network to be completed before determining whether switching is required. This waiting time is called the coordinated protection delay time. In actual implementation scenarios, the time for the completion of protection switching of the optical network is the time from when the source and sink nodes of the optical network's business/optical channel detect a link failure or local fault to the completion of the protection switching of the optical network, that is, the protection of the optical network The sum of the delay time and the switching time of the optical network. The protection delay time of the optical network is the length of time it takes to trigger the protection switching of the optical network from the detection of a link failure. The protection switching time of the optical network is the time from the triggering of the protection switching of the optical network to the The length of time for network protection switching to be completed. Therefore, the sum of the protection delay time of the optical network and the switching time of the optical network can be regarded as the cooperative protection delay time.

The protection delay time of the optical network and the switching time of the optical network are included in the protection configuration parameters of the optical network, which can be configured values or set default values. In an actual implementation scenario, the protection delay time of the optical network is configured as 30ms, and then the protection switching time of the optical network is set to the default value of 50ms. In this scenario, the coordinated protection switching time = the protection delay time of the optical network + the protection of the optical network Switching time=30ms+50ms.

Step 102: Determine the IP service protection configuration parameters sent to the IP network management and control function. The IP service protection configuration parameters include the IP service protection delay time and/or the collaborative protection delay time.

In order not to change the original execution logic and parameter calling relationship of IP service cooperative protection switching, in this embodiment, the protection configuration parameters actually used by IP services when performing protection switching do not use additional data structures or parameters, but are based on existing Verify based on the protection configuration parameters of the IP service, and replace the existing protection delay time when it does not meet the needs, so that the source and sink nodes of the IP service can coordinate protection switching when a fault is detected. Specifically, when the protection delay time of the existing IP service is greater than or equal to the collaborative protection switching time, the protection delay time of the existing IP service can ensure a sufficient waiting time, and the protection delay time of the existing IP service is used as the collaborative protection switching time. The value of the protection delay time of the IP service during switching; when the protection delay time of the existing IP service is less than the cooperative protection delay time, the completion of optical layer protection switching cannot be ensured, and the cooperative protection delay time needs to be used as the protection delay of the IP service during cooperative switching. The value of time.

Step 103: When the source and sink nodes of the IP service detect a fault, they trigger protection switching according to the protection configuration parameters of the IP service.

After obtaining the protection configuration parameters, the source and sink nodes of the IP service detect the fault indication information and trigger collaborative switching based on the collaborative protection delay time and fault indication information.

After receiving the delivered cooperative protection switching time, the source and sink nodes of the IP service wait according to the cooperative protection switching time. If the fault occurs in the optical network, after waiting for the coordinated protection switching time, the network has returned to normal, and the source and sink nodes of the IP service will no longer detect the fault indication information, and there is no need to perform protection switching of the IP service; if the fault occurs in the IP network, After waiting for the cooperative protection switching time, the source and sink nodes of the IP service can still detect the fault indication information. At this time, the IP layer protection switching is triggered.

In specific implementation, the fault indication information includes SF/SD of the IP network and optical network fault indication information of the optical network. When there is a fault in the optical network, the source and sink nodes of the IP service will detect SF/SD, and the optical network will detect the optical network fault indication information. When there is a fault in the IP network, the source and sink nodes of the IP service will detect SF/SD, but will not detect the optical network fault indication information.

After steps 101 to 103 provided in this embodiment, the protection delay time of the IP service is adjusted according to the protection switching completion time of the optical network. After the optical network performs protection switching, only the source and sink nodes of the IP service are confirmed to still be faulty. Protection switching is then performed to avoid invalid protection switching of IP services.

In the method provided by this embodiment, nodes in the optical network also need to obtain configuration parameters related to protection switching. As shown in Figure 2, parameter delivery can be completed through the following steps.

Step 201: The optical network management and control function delivers network element configuration parameters to the optical network nodes. The protection configuration parameters of the optical network delivered to the source and sink nodes of the optical network service/optical channel include the protection delay time of the optical network.

Step 202: The optical network node returns the optical network node configuration confirmation message to the optical network management and control function.

Step 203: The optical network management and control function returns the configuration confirmation message of the optical network service/optical channel to the collaboration function.

Through steps 201 to 203, protection switching related parameters are delivered to the nodes in the optical network, so that the optical network can complete protection switching according to the configuration parameters.

During the specific implementation process, different cooperative switching triggering strategies can be used according to different requirements in the implementation scenario. The following simply provides two available collaborative switching triggering strategies. In actual implementation, you can choose to use one according to actual needs, or you can use it in conjunction with other existing collaborative management and control measures without conflict.

Method 1: No changes are made to the equipment, and only the collaborative configuration of the management and control system is used to reduce invalid switching. The management and control system configures the protection delay time of the IP service based on the collaborative protection delay time. Without changing the equipment and system, the source and sink nodes of the IP service wait for the completion of the optical network switching and then determine whether to perform the switch based on the fault situation. To reduce the number of invalid switching of IP services.

As shown in Figure 3, the triggering of coordinated switching can be completed through the following steps.

Step 301: Verify the protection delay time of the IP service based on the collaborative protection delay time, and deliver the protection configuration parameters of the IP service to the IP network management and control function.

The management and control system verifies the protection delay time of IP services based on the coordinated protection delay time, and resets the protection delay time of IP services based on the verification results. Since the collaborative protection delay time and the IP service protection delay time are both duration values, the collaborative protection delay time value and the IP service protection delay time value can be directly compared. When the configured or default protection delay time value of the IP service is less than the collaborative protection delay time value, the protection delay time value of the IP service is reset to the collaborative protection delay time value.

In actual implementation scenarios, the protection delay time of IP services can be a configured value or a default value.

(1) When the protection delay time of the IP service is the configured value, compare the collaborative protection delay time value with the configured protection delay time value of the IP service. When the configured protection delay time value of the IP service < the collaborative protection delay time value, The protection delay time value of the IP service is reset to the collaborative protection delay time value.

(2) When the IP service protection delay time is not configured, compare the collaborative protection delay time with the default IP service protection delay time. When the default IP service protection delay time > = collaborative protection delay time, change the IP service protection delay time. The delay time is set to the default value; when the default IP service protection delay time is less than the collaborative protection delay time, the protection delay time of the IP service is set to the collaborative protection delay time value.

Step 302: The IP network management and control function delivers the protection configuration parameters of the IP service to the source and sink nodes of the IP service.

After verifying the protection delay time of the IP service, the verified IP service protection delay time also needs to be delivered to the source and sink nodes of the IP service. The collaboration function sends the verified IP service protection delay time to the IP network management and control function, and the IP network management and control function sends the verified IP service protection delay time to the source and sink nodes of the IP service.

Step 303: When the source and sink nodes of the IP service detect SF/SD, the protection switching of the IP service is triggered based on the verified protection delay time of the IP service.

In this method, the source and sink nodes of the IP service wait for the optical network to complete switching and then determine whether there is a fault again. Specifically, it is necessary to detect signal failure (SF) and signal degradation (SD).

After the source and sink nodes of the IP service have waited for the protection delay time of the IP service, the protection switching of the optical network has been completed, and SF/SD is detected again. When SF/SD still exists, it indicates that the protection switching of the optical network has not resolved the fault or the fault occurs in the IP network, triggering protection switching of the IP service. If it is detected that SF/SD does not exist, it indicates that the fault has been resolved and there is no need to perform protection switching of IP services. Therefore, protection switching of IP services will not be triggered, thus avoiding invalid protection switching of IP services.

After steps 301 to 303 provided in this embodiment, without changing the equipment and system, by extending the protection delay time of the IP service in the configuration parameters, the source and sink nodes of the IP service wait for the optical network to complete switching. Then determine whether to perform switching, which avoids triggering protection switching when the IP network does not fail, and reduces the number of IP service protection switching.

During the specific implementation process, as shown in Figure 4, the following steps can be used to complete the process of delivering the verified protection delay time of the IP service to the source and sink nodes of the IP service in step 301, and returning a response confirmation message.

Step 401: The IP network management and control function delivers network element configuration parameters to the IP network nodes. The IP service protection configuration parameters delivered to the source and sink nodes of the IP service include the verified IP service protection delay time.

Step 402: The IP network node returns the IP network element configuration confirmation message to the IP network management and control function.

Step 403: The IP network management and control function returns an IP service configuration confirmation message to the collaboration function.

Through steps 401 to 403, the protection delay time of the verified IP service is issued according to the existing parameter configuration method, so that the IP service waits for sufficient time during switching.

Method 2: Add protection coordination configuration to the management and control system, and add a fault identification mechanism across IP networks and optical networks at both IP network nodes and optical network nodes.

As shown in Figure 5, the triggering of coordinated switching can be completed through the following steps.

Step 501: The source and sink nodes of the IP service deliver the protection delay time and collaborative protection delay time of the IP service.

In the second method, the IP service protection delay time is not verified, but the IP service protection delay time and collaborative protection delay time are delivered at the same time, and different protection delay times are used according to different fault conditions. Specifically: the collaboration function sends the IP service protection delay time and collaborative protection delay time to the IP network management and control function. The IP network management and control function sends the protection delay time and collaborative protection delay time of the IP service to the source and sink nodes of the IP service.

Step 502: After receiving the event notification of the optical network failure, the neighboring node of the IP network sends the optical network failure indication information to the source and sink nodes of the IP service.

In order to reduce the waiting time during IP service switching, unlike method 1, the source and sink nodes of the IP service in method 2 can obtain the optical network fault indication information, and the source and sink nodes of the optical network service/optical channel send instructions to the neighboring nodes of the IP network. Event notification of optical network failure: After receiving the event notification indicating an optical network failure, the neighboring node of the IP network sends optical network failure indication information to the source and sink nodes of the IP service. The neighbor node of the IP network refers to the edge node of the IP network adjacent to the source and sink nodes of the service/optical channel of the optical network that carries the IP service on the working path of the IP service. Therefore, different triggering strategies can be implemented according to different fault types.

Step 503: After the source and sink nodes of the IP service detect SF/SD and/or receive optical network fault indication information, they trigger IP service protection switching based on the IP service protection delay time and collaborative protection delay time.

When the source and sink nodes of the IP service detect SF/SD and receive optical network fault indication information, it indicates that there may be an IP network fault or an optical network fault. This is consistent with the strategy in method 1. Wait for the optical network switching to be completed. . The source and sink nodes of the IP service wait for the collaborative protection delay time and then detect SF/SD again. When SF/SD still exists, it indicates that the optical network switching has not resolved the fault. It is confirmed that the cause of the fault is in the IP network, so IP service protection switching is triggered. If it is detected that SF/SD does not exist, it indicates that the optical network switching has solved the fault and the network has returned to normal. IP service protection switching will not be triggered, thus avoiding invalid switching of IP services.

When the source and sink nodes of the IP service detect SF/SD but do not receive the optical network fault indication information, it indicates that only the IP network has failed. Therefore, there is no need to wait for the protection switching of the optical network, but directly wait for the protection delay of the IP service. The protection switching of IP services is triggered after a certain time, which reduces the waiting time during protection switching and improves the efficiency of fault handling.

After steps 501 to 503 provided in this embodiment, through cooperative fault detection of the optical network and IP network, the waiting time for cooperative protection switching is reduced on the basis of avoiding invalid protection switching.

Furthermore, in the method provided by this embodiment, the protection delay time of IP services is extended according to the collaborative protection delay time, so the switching delay time of some IP services may become longer. In order to avoid extending the protection delay time for IP services of high-priority or important customers or other key protection services designated by operators, priority service policies can be combined with the implementation to verify only the IP service switching time of ordinary services. , high-priority IP services or all IP services of important customers are not verified, thus avoiding prolonging the protection delay time of high-priority IP services or important customers. Specifically, the business priority or the level of the customer to which the business user's business belongs can be obtained, and based on the preconfigured policy, it can be determined whether the business needs to be verified for collaborative protection configuration, and the protection delay time of the IP business can only be verified for the business or customer set by the policy. . Or the received IP and optical service creation request message carries a parameter indicating whether to perform collaborative protection configuration, and when the parameter value determines that it should be performed, the protection delay time of the IP service is checked.

In actual implementation, it can be implemented in combination with operator strategies such as business priority (for example: high priority, low priority), customer level (for example: general users, platinum customers, diamond customers, etc.). The specific operation method is: (1) Use the provisioning policy to indicate that services of a specific customer level or priority will undergo a verification process of collaborative protection configuration. (2) When obtaining the protection configuration parameters of the IP service and the protection configuration parameters of the optical network in step 101, obtain the customer level or service priority parameters at the same time. (3) Before step 301, determine whether to perform collaborative protection configuration verification based on the preconfigured policy, and perform verification in step 301 only for the business priority or customer level set by the policy. You can also directly add a parameter of whether to configure cooperative protection in step 101 to indicate whether the cooperative function needs to perform cooperative protection switching according to the method provided in this embodiment in subsequent steps.

The method for collaborative management and control of IP and optical network protection switching provided in this embodiment sets the collaborative protection switching time so that IP service protection switching is triggered after the protection switching of the optical network has been completed. On the one hand, in the IP+optical scenario, if the IP service is interrupted due to an optical network failure, it is ensured that the protection switching of the optical network is given priority and the number of invalid switching of IP services is reduced, thereby avoiding the problem of a large number of IP services triggering protection switching at the same time when the optical network fails. The network is unstable. On the other hand, a fault identification mechanism across IP networks and optical networks is added, so that the source and sink nodes of IP services can accurately perceive IP service interruptions caused by optical network faults, thereby ensuring that IP services are only triggered when a fault occurs in the IP network. protection switching to improve the effectiveness of IP service protection switching.

Example 2:

Based on the method for collaborative management and control of IP and optical network protection switching provided in the above-mentioned Embodiment 1, the present invention also provides a system that can be used to implement the collaborative management and control of IP and optical network protection switching.

As shown in Figure 6, it is a schematic diagram of the system architecture of an embodiment of the present invention. Among them, the collaborative functional unit sends IP service protection configuration parameters including the protection delay time and/or the collaborative protection delay time of the IP service to the IP network management and control functional unit according to the IP and optical network protection switching collaborative management and control method provided in Embodiment 1; Optical When the source and sink nodes of the network service/optical channel detect a fault, they complete the protection switching of the optical network based on the protection configuration parameters provided by the optical network management and control functional unit; the source and sink nodes of the IP service still detect the fault after the protection switching of the optical network is completed. When the IP network management and control function unit provides protection configuration parameters, the protection switching of the IP network is completed. Furthermore, in order to make the system hierarchy clearer and reduce the complexity of system development and update, the system architecture can be divided into three levels, the collaboration layer, the single-domain management and control layer and the network forwarding layer. The collaboration layer completes IP and optical collaboration. Functional units, the single-domain management and control layer includes IP network management and control functional units and optical network management and control functional units, and the network forwarding layer includes IP networks and optical networks.

Specifically, the IP network management and control functional unit and the optical network management and control functional unit manage the IP network and the optical network respectively, and collaboratively manage and control the protection switching delay time of the IP network and the optical network according to the parameters provided by the collaborative functional unit. When the IP network or optical network When a network failure occurs, protection switching can be performed according to the collaborative management and control method of IP and optical network protection switching provided in Embodiment 1. In this embodiment, IP and optical services refer to end-to-end IP services across IP networks and optical networks, specifically including L3VPN, L2VPN, EVPN and other service types. The protection of IP services includes tunnel protection, PW protection, etc.; the protection of optical networks includes ODUk protection, OCh protection, etc. Correspondingly, when the IP service is L3VPN, the protection of the IP service includes L3VPN service layer tunnel protection. When the IP service is In L2VPN, IP service protection includes L2VPN service layer tunnel protection and PW protection.

The following simply provides some examples of implementing collaborative management and control of protection switching in the system provided in this embodiment. In actual implementation, you can refer to the following example to complete coordinated management and control of protection switching according to the method in Embodiment 1. The specific implementation scenarios in the following examples are shown in Figure 7.

(1) As shown in the timing diagram in Figure 8, method 1 in Embodiment 1 is used to perform protection switching.

The collaborative functional unit receives the creation request of the IP+optical service, and obtains the protection configuration parameters of the IP service and the protection configuration parameters of the optical network contained in the creation request according to step 101. The source and sink nodes of the service are A1 and C5 respectively, and the IP service type is For L3VPN business, the protection type of IP business is L3VPN service layer tunnel protection, and the protection type of optical network is ODUk 1+1 protection.

The collaborative functional unit determines the IP service protection configuration parameters, including calculating the collaborative protection delay time according to step 101. The collaborative protection delay time = the protection of the optical network (i.e., ODUk 1+1 protection) delay time + the protection of the optical network (i.e., ODUk 1+1 protection) switching time. Among them, ODUk 1+1 protection switching time <=50ms, the default is 50ms, and it is configurable. Assuming that the ODUk 1+1 protection delay time is 30ms and the ODUk 1+1 protection switching time is the default value of 50ms, the collaborative protection delay time is 30ms+50ms=80ms.

The collaborative functional unit verifies the IP service protection delay time according to step 301. The verification method is as follows.

(1) Compare the collaborative protection delay time value with the configured IP service protection delay time value. When the configured IP service protection delay time value < the collaborative protection delay time value, the IP service protection delay time value is reset to the collaborative protection delay value. time value. Assume that the tunnel protection delay time in the protection configuration parameters of the current IP service received by the collaborative functional unit in step 101 is 60ms. Since 60ms<80ms, the tunnel protection delay time value of the IP service is reset to 80ms.

(2) When the IP service protection delay time is not configured, compare the collaborative protection delay time and the default IP service protection delay time. When the default IP service protection delay time > = collaborative protection delay time, the IP service protection delay time The time is set to the default value; when the default IP service protection delay time is less than the collaborative protection delay time, the tunnel protection delay time of the IP service is set to the collaborative protection delay time value of 80ms.

The collaborative functional unit interacts with the IP network management and control functional unit and the optical network management and control functional unit to determine IP and optical end-to-end service paths, including working paths and protection paths.

The collaborative functional unit issues the business configuration parameters of the light-emitting network under the optical network management and control functional unit, including the protection delay time of the optical network. The specific process is: the optical network management and control functional unit issues network element configuration parameters to the optical network node, among which the optical network management and control functional unit issues network element configuration parameters to the optical network node. ODUk protection configuration parameters issued by the source and sink network elements of the service/optical channel, including ODUk 1+1 protection delay time. The optical network node returns the optical network element configuration confirmation message to the optical network management and control functional unit; the optical network management and control functional unit returns the optical network service configuration confirmation message to the coordination functional unit.

The collaborative functional unit issues IP service configuration parameters to the IP network management and control functional unit, including the verified IP service protection delay time. The specific process is: the IP network management and control functional unit delivers network element configuration parameters to the IP network network elements. The IP service protection configuration parameters issued to the source and sink network elements of the IP service include the verified IP service protection delay. time. The IP network network element returns an IP network network element configuration confirmation message to the IP network management and control functional unit. The IP network management and control functional unit returns an IP service configuration confirmation message to the collaborative functional unit.

After the optical network fails, the source and sink nodes of the optical network's service/optical channel detect SF/SD, and after waiting for the ODUk protection delay time, ODUk protection switching is triggered. Assume that the link between optical network elements B2 and B5 fails, and B1 or B5 detects the SF signal. After the source and sink nodes of the optical channel wait for 30ms according to the switching delay time, ODUk protection switching is triggered, that is, the working path of B1<-->B2<-->B5 is switched to that of B1<-->B3<-->B5. Protect the path. Then the source node of the optical channel sends a notification message of the ODUk protection switching event to the optical network management and control functional unit, and then the optical network management and control functional unit sends a notification message of the ODUk protection switching event to the collaborative functional unit.

At the same time, after the source and sink nodes of the IP service detect SF/SD, according to the switching strategy in step 302, after waiting for the protection delay time of the verified IP service, if the SF/SD signal still exists, the protection of the IP service is triggered. Switching, otherwise it will not trigger. Assume that the link between IP nodes (network elements or equipment) A2 and A5 and the link between B2 and B5 are faulty. IP node A1 detects SF. After waiting for 80ms, the ODUk protection switching operation returns ODUk to normal. However, A1 detects that the SF signal still exists, and IP network element A1 triggers tunnel protection switching of the IP service; if only the link between B2 and B5 fails, after the ODUk protection switching operation is performed, the SF signal on IP network element A1 disappears, A1 does not trigger protection switching of IP services. If the source and sink nodes of the IP service trigger tunnel protection switching of the IP service, a notification message of the tunnel protection switching event of the IP service is sent to the IP network management and control functional unit, and then the IP network management and control functional unit sends a tunnel protection switching event of the IP service to the coordination functional unit. Notification message for protection switching events. (2) As shown in the timing diagram in Figure 9, method 2 in Embodiment 1 is used to perform protection switching.

The collaborative functional unit receives the creation request for the IP and optical services, and obtains the protection configuration parameters of the IP service and the protection configuration parameters of the optical network contained in the creation request according to step 101. The source and sink nodes of the IP service are A1 and C5, and the IP service is L3VPN. Business, the protection type of IP business is tunnel protection, and the protection type of optical network is ODUk 1+1 protection.

The collaborative functional unit determines the IP service protection configuration parameters, including calculating the collaborative protection delay time according to step 101. The collaborative protection delay time = the protection delay time of the optical network (ie, ODUk1 protection) + the switching time of optical network protection (ie, ODUk1 protection), where ODUk 1+1 protection switching time <=50ms, default is 50ms, configurable. Assuming that the ODUk 1+1 protection delay time is 30ms and the ODUk1+1 protection switching time is the default value of 50ms, the collaborative protection delay time is 30ms+50ms=80ms.

The collaborative functional unit interacts with the IP network management and control functional unit and the optical network management and control functional unit and determines the IP+optical end-to-end service path, including the working path and the protection path.

The collaborative functional unit configures the lighting channel parameters for the optical network management and control functional unit, including the ODUk1+1 protection delay time. The specific process is: the optical network management and control functional unit delivers network element configuration parameters to the optical network nodes, including the ODUk 1+1 protection configuration parameters delivered to the source and sink nodes of the optical network business/optical channel, including ODUk 1+1 protection Delay time. The optical network node returns an optical network element configuration confirmation message to the optical network management and control functional unit. The optical network management and control functional unit returns the business/optical channel configuration confirmation message of the optical network to the collaborative functional unit;

The collaborative functional unit delivers IP service configuration parameters to the IP network management and control functional unit, including IP service protection delay time and collaborative protection delay time. The specific process is: the IP network management and control functional unit delivers network element configuration parameters to the IP network nodes. The protection configuration parameters of the IP service delivered to the source and sink nodes of the IP service include the protection delay time and collaborative protection delay time of the IP service. . The IP network network element returns an IP network network element configuration confirmation message to the IP network management and control functional unit. The IP network management and control functional unit returns an IP service configuration confirmation message to the collaborative functional unit.

After the optical network fails, the source and sink nodes of the optical network's service/optical channel detect SF/SD, and after waiting for the ODUk protection delay time, ODUk protection switching is triggered. Assume that the link between optical network nodes (network elements or equipment) B2 and B5 fails, B1 or B5 detects the SF signal, and after waiting for 30ms, triggers ODUk protection switching, that is, from B1<-->B2<-- >The working path of B5 is switched to the protection path of B1<-->B3<-->B5. Specifically: the source and sink network element (B1 network element or B5 network element) of the optical channel sends a notification message of the ODUk protection switching event to the optical network management and control functional unit, and then the optical network management and control functional unit sends a notification message of the ODUk protection switching event to the collaborative functional unit. notification message.

The source and sink nodes of the optical channel send event notifications indicating optical network failures to neighboring nodes in the IP network. Corresponding to Figure 7, the B1 network element sends event notifications of optical network failures to the A5 network element or the B5 network element sends the event notifications of the optical network failures to the C1 network element.

After receiving the event notification indicating the optical network failure, the neighboring node of the IP network sends the optical network failure indication information to the source and sink nodes of the IP service. Corresponding to Figure 7, A5 sends the optical network fault indication information to A1 or C1 to C5.

At the same time, the source and sink nodes of the IP service detect SF/SD and receive optical network fault indication information. According to the switching strategy in step 503, after waiting for the collaborative protection delay time, if it is detected that SF/SD still exists, the IP service is triggered. Tunnel protection switching, if it is detected that SF/SD does not exist, the tunnel protection switching of the IP service will not be triggered; the source and sink nodes of the IP service detect SF/SD, but do not receive the optical network fault indication information, and are waiting for the IP service. After the tunnel protection delay time, the tunnel protection switching of the IP service is triggered. Assume that the link between B2 and B5 fails, A1 or C5 detects SF and receives optical network fault indication information. After waiting for the 80ms cooperative protection delay time calculated in step S32, the detected SF information disappears, and the IP service is not triggered. tunnel protection switching. Assume that the link between A2 and A5 fails and A1 detects SF but does not receive the optical network failure indication information. After waiting for the tunnel protection delay time of the IP service for 60ms, it triggers the switch from the working path of the IP service to the IP service. Protect the path. Specifically: the source and sink nodes of the IP service send a notification message of the tunnel protection switching event of the IP service to the IP network management and control functional unit, and then the IP network management and control functional unit sends a notification message of the tunnel protection switching event of the IP service to the coordination functional unit.

In the above process, the event notification of optical network failure and the optical network failure indication information are new message instructions between nodes (network elements or devices), which can be implemented by extending the existing protocols between nodes. For example, if there is an Ethernet link between an IP network element and an optical network element and supports the EMF OAM protocol, you can extend the fields or meanings of the OAM PDU to notify event notifications of optical network failures; if the IP network elements support MPLS-TP OAM , then the OAM message field can be extended to indicate optical network faults.

It can be seen from the above process that the system provided by this embodiment can complete the collaborative management and control method of IP and optical network protection switching provided in Embodiment 1, can effectively avoid service instability caused by simultaneous IP and optical network switching, and reduce invalid switching of IP services. number of times.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims

A method for coordinated management and control of IP and optical network protection switching, which is characterized by specifically including:

Obtain the initial protection configuration parameters of the IP service and the protection configuration parameters of the optical network, and use the sum of the protection delay time of the optical network and the protection switching time of the optical network as the collaborative protection delay time;

Determine the protection configuration parameters of the IP service sent to the IP network management and control function, where the protection configuration parameters of the IP service include the protection delay time and/or the collaborative protection delay time of the IP service;

When the source and sink nodes of the IP service detect a fault, they trigger protection switching according to the protection configuration parameters of the IP service.
The method for cooperative management and control of IP and optical network protection switching according to claim 1, characterized in that said obtaining the initial protection configuration parameters of the IP service and the protection configuration parameters of the optical network specifically includes:

Receive the creation request message of the IP and optical services, and obtain the initial protection configuration parameters of the IP service and the protection configuration parameters of the optical network from the creation request message;

Or receive a creation request message for IP and optical services, obtain the initial protection configuration parameters of the IP service from the creation request message, and obtain the protection configuration parameters of the service/optical channel of the existing optical network.
The method for coordinated management and control of IP and optical network protection switching according to claim 1, characterized in that the triggering of protection switching according to the protection configuration parameters of the IP service specifically includes:

The protection delay time of the IP service is verified based on the collaborative protection delay time, and the protection configuration parameters of the IP service are delivered to the IP network management and control function, where the protection configuration parameters of the IP service include the verified protection delay time of the IP service. ;

The IP network management and control function delivers the protection configuration parameters of the IP service to the source and sink nodes of the IP service;

When the source and sink nodes of the IP service detect SF/SD, protection switching of the IP service is triggered based on the verified protection delay time of the IP service.
The method for collaborative management and control of IP and optical network protection switching according to claim 3, characterized in that the protection delay time of the IP service is verified according to the collaborative protection delay time, specifically including:

Compare the collaborative protection delay time value with the protection delay time value of the IP service. When the configured or default IP service protection delay time value is less than the collaborative protection delay time value, reset the protection delay time value of the IP service to the collaborative protection delay value. time value.
The method for cooperative management and control of IP and optical network protection switching according to claim 3, characterized in that the IP service protection switching is triggered according to the protection delay time of the verified IP service, specifically including:

The source and sink nodes of the IP service wait for the protection delay time of the verified IP service before detecting SF/SD again;

When SF/SD still exists, IP service protection switching is triggered.
The method for collaborative management and control of IP and optical network protection switching according to claim 3, characterized in that the verification of the protection delay time of the IP service based on the collaborative protection delay time also includes:

Obtain the business priority or the level of the customer to which the business belongs, and determine whether the business needs to be verified for collaborative protection configuration based on the preconfigured policy. Only the protection delay time of the IP business is verified for the business or customer set by the policy;

Or, the received IP and optical service creation request message carries a parameter indicating whether to perform collaborative protection configuration, and determines whether the protection delay time of the IP service should be verified based on the value of the parameter.
The method for coordinated management and control of IP and optical network protection switching according to claim 1, characterized in that the triggering of protection switching according to the protection configuration parameters of the IP service specifically includes:

Deliver IP service protection configuration parameters to the IP network management and control function, where the IP service protection configuration parameters include IP service protection delay time and collaborative protection delay time;

The IP network management and control function delivers the protection delay time and collaborative protection delay time of the IP service to the source and sink nodes of the IP service;

After receiving the optical channel failure event, the neighboring node of the IP service sends optical network failure indication information to the source and sink nodes of the IP service;

After the source and sink nodes of the IP service detect SF/SD and/or receive optical network fault indication information, they trigger IP service protection switching based on the protection delay time and collaborative protection delay time of the IP service.
The method for collaborative management and control of IP and optical network protection switching according to claim 7, characterized in that the protection switching of the IP service is triggered based on the protection delay time of the IP service and the collaborative protection delay time, specifically including:

When the source and sink nodes of the IP service detect SF/SD and receive optical network fault indication information, the source node of the IP service waits for the collaborative protection delay time and then detects SF/SD again. When SF/SD still exists, trigger IP Protection switching of services;

When the source and sink nodes of the IP service detect SF/SD but do not receive optical network fault indication information, they wait for the protection delay time of the IP service and then trigger the protection switching of the IP service.
The method for coordinated management and control of IP and optical network protection switching according to claim 1, characterized in that the triggering of protection switching according to the protection configuration parameters of the IP service specifically includes:

The source and sink nodes of the IP service detect the SF/SD signal indicating a fault and/or, after receiving the optical network fault indication information, trigger protection switching.
The method for cooperative management and control of IP and optical network protection switching according to claim 1, characterized in that said obtaining the initial protection configuration parameters of the IP service and the protection configuration parameters of the optical network specifically includes:

The protection switching configuration parameter protection includes one or more of: protection level, protection type, protection delay time, protection switching time, recovery time and whether to restore to the working path.
The method for cooperative management and control of IP and optical network protection switching according to claim 1, characterized in that the sum of the protection delay time of the optical network and the protection switching time of the optical network is used as the cooperative protection delay time, specifically including:

When the protection delay time of the existing IP service is greater than or equal to the coordinated protection switching time, use the protection delay time of the existing IP service as the value of the protection delay time of the IP service during coordinated switching;

When the protection delay time of the existing IP service is less than the cooperative protection delay time, use the cooperative protection delay time as the value of the protection delay time of the IP service during cooperative switching.
The method for cooperative management and control of IP and optical network protection switching according to claim 1, characterized in that the sum of the protection delay time of the optical network and the protection switching time of the optical network is used as the cooperative protection delay time, specifically including:

When the protection delay time of the IP service is the configured value, compare the collaborative protection delay time value with the configured protection delay time value of the IP service. When the configured protection delay time value of the IP service < the collaborative protection delay time value, the IP service The protection delay time value is reset to the collaborative protection delay time value;

When the IP service protection delay time is not configured, compare the collaborative protection delay time with the default IP service protection delay time. When the default IP service protection delay time > = collaborative protection delay time, set the IP service protection delay time. is the default value; when the default IP service protection delay time < collaborative protection delay time, set the IP service protection delay time to the collaborative protection delay time value.
The method for cooperative management and control of IP and optical network protection switching according to claim 6, characterized in that the protection delay time only for policy-set services or customer verification IP services specifically includes:

Services that indicate a specific customer level or priority through provisioning policies will undergo a collaborative protection configuration verification process;

And/or, when obtaining the protection configuration parameters of the IP service and the protection configuration parameters of the optical network, obtain the customer level or service priority parameters at the same time, and determine the priority of the protection switching based on the customer level or service priority parameters;

and/or, before verifying the protection delay time of the IP service based on the collaborative protection delay time, first determine whether to verify the collaborative protection configuration based on the preconfigured policy, only for the business priority or customer set by the policy Check the level;

And/or, when obtaining the initial protection configuration parameters of the IP service and the protection configuration parameters of the optical network, obtain at the same time the parameters of whether the service or customer of each level performs cooperative protection configuration, which is used to indicate whether the service or user performs cooperative protection switching.
A system for collaborative management and control of IP and optical network protection switching, which is characterized by including a collaborative functional unit, an IP network management and control functional unit and an optical network management and control functional unit, specifically:

According to the method for collaborative management and control of IP and optical network protection switching according to any one of claims 1 to 9, the collaborative functional unit sends the IP service including the protection delay time of the IP service and/or the collaborative protection delay time to the IP network management and control functional unit. Protect configuration parameters;

When the source and sink nodes of the optical network service/optical channel detect a fault, the protection switching of the optical network is completed according to the protection configuration parameters provided by the optical network management and control functional unit;

When the source and sink nodes of the IP service still detect a fault after the protection switching of the optical network is completed, the protection switching of the IP network is completed according to the protection configuration parameters provided by the IP network management and control functional unit.
The system for coordinated management and control of IP and optical network protection switching according to claim 14, which specifically includes:

When the IP service is L3VPN, the protection of the IP service is L3VPN service layer tunnel protection;

When the IP service is L2VPN, the protection of the IP service is L2VPN service layer tunnel protection and/or PW protection.
The system for coordinated management and control of IP and optical network protection switching according to claim 14, which specifically includes:

When there is an Ethernet link between the IP network element and the optical network element and the EMF OAM protocol is supported, event notification of optical network faults is performed by extending the fields or meanings of the OAM PDU;

When MPLS-TP OAM is supported between IP network elements, optical network faults are indicated by extending the OAM message field.