Method for constructing private network and realizing intelligent management and control in multi-domain OTN network

Abstract

The present application relates to the technical field of optical transport network, and particularly relates to a method for constructing private network and realizing intelligent management and control in multi-domain OTN network, comprising the following steps: constructing wide-area private OTN network based on customized small private OTN equipment and combining with operator OTN network; performing global management and control on the private OTN network based on the OTN private network management system independently developed and the multi-channel intelligent management and control module embedded in the private OTN equipment. The method can support the whole end-to-end service scheduling and whole protection recovery functions which cannot be realized by traditional cross-operator OTN private line, compared with the virtual private network based on network layer, has higher service isolation ability and security, and constructs the wide-area private OTN network at a lower cost, meets the needs of global management and control, efficient service scheduling, whole service automatic protection and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical transport network, and particularly relates to a method for constructing a private network and realizing intelligent management and control in a multi-domain OTN network. BACKGROUND

[0002] At present, a fixed optical network backbone network is mainly constructed by a telecom operator based on an OTN (optical transport network) system, uses OTN equipment of different manufacturers, and adopts a multi-domain networking mode to construct an OTN network covering the whole country, thereby providing communication services covering the whole country. In addition to the public network constructed by the operator, large organizations or enterprises such as governments, armies, railways and electric power also construct their own private networks. In addition to constructing a private network at the network layer, some organizations also have the demand for constructing a private optical transmission network covering the whole country. These private optical transmission networks rent a large number of OTN private lines of the operator to complete the construction of the private network, and the private optical network formed by the private lines managed and controlled by the operator has the following problems:

[0003] A private network composed of multiple operator private lines across multiple manufacturer equipment domains cannot realize fast end-to-end service scheduling in the service establishment process, and the service scheduling efficiency is low. The segmented service can only provide service protection switching function when a fault occurs in the same manufacturer domain, and cannot realize automatic protection of the whole service. The private lines belong to different operators and different manufacturer equipment networks, and the management and control information is difficult to interwork, so that independent intelligent management and control of the whole network cannot be realized. SUMMARY

[0004] The present application aims to provide a method for constructing a private network and realizing intelligent management and control in a multi-domain OTN network, and aims to solve the problems that a network composed of segmented private lines is difficult to realize independent management and control, and cannot realize fast scheduling and protection recovery of the whole service.

[0005] To achieve the above-mentioned purpose, the present application provides a method for constructing a private network and realizing intelligent management and control in a multi-domain OTN network, comprising the following steps:

[0006] Constructing a wide-area private OTN network based on customized small private OTN equipment and an operator OTN network;

[0007] Controlling the whole private OTN network based on an OTN private network management system developed independently and a multi-channel intelligent management and control module embedded in the private OTN equipment.

[0008] The private OTN equipment configures OTU-1 and OTU-2 line interfaces according to the bandwidth requirement of the private network, and can be upgraded to higher capacity interfaces according to the requirement, and the number of interfaces is configured according to the number of different OTN domains connected.

[0009] The special OTN device can flexibly select OTN internal overhead (GCC overhead), VC12 channel / 2M interface, serial interface and Ethernet interface as a network management channel, support in-band and out-of-band transmission modes, and realize unified management and control of the special OTN device across operator network domains.

[0010] The special OTN device and the operator's dedicated service resource are included in unified management and control, end-to-end rapid scheduling of cross-domain services is realized, re-routing recovery is realized when the service fails, and independent operation, management and maintenance capabilities are provided, after the wide-area special OTN network is built, end-to-end service scheduling and service protection recovery can be independently performed, and at the same time, no conflict with other services of the operator is caused.

[0011] The operator network through which the service passes needs to reserve bandwidth resources, and the special OTN device is placed at the boundary of each operator network domain through which the service passes, and more fine-grained bandwidth service scheduling is performed.

[0012] The method for constructing a special network and realizing intelligent management and control in a multi-domain OTN network, based on a customized small special OTN device combined with an operator OTN network, constructs a wide-area special OTN network; based on an OTN special network management system developed independently and a multi-channel intelligent management and control module embedded in the special OTN device, the special OTN network is managed and controlled in the whole domain, and based on a special routing calculation method, end-to-end service intelligent scheduling and fault recovery are realized, meeting the needs of efficient service scheduling and high-reliability transmission, the method can support the full-path end-to-end service scheduling and full-path service protection recovery capabilities that cannot be realized by traditional cross-operator OTN dedicated lines, compared with a virtual private network based on a network layer, the method has higher service isolation capability and security, and constructs a wide-area special OTN network at a lower cost and realizes independent management and control of the special network, meeting the needs of whole-domain controllability, efficient service scheduling, full-path service automatic protection and the like, and solving the problems that a network composed of segmented dedicated lines is difficult to realize independent management and control, and cannot realize full-path service rapid scheduling and protection recovery. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0014] Figure 1 It is a configuration diagram of a network special network construction and intelligent management and control system.

[0015] Figure 2Is the network in the construction of private network and realize the intelligent management and control system architecture and working principle schematic diagram.

[0016] Figure 3 Is the flow chart of the method for constructing private network and realizing intelligent management and control in a multi-domain OTN network provided by the application.

[0017] Figure 4 Is the network construction mode example diagram of the application.

[0018] Figure 5 Is the network management information transmission mode example diagram of the application.

[0019] Figure 6 Is the multi-channel intelligent management and control module principle diagram of the application.

[0020] Figure 7 Is the service scheduling path calculation topology example diagram of the application. DETAILED DESCRIPTION

[0021] The embodiments of the application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application.

[0022] Please refer to Figures 1 to 7 The application provides a method for constructing private network and realizing intelligent management and control in a multi-domain OTN network, comprising the following steps:

[0023] S1, based on the customized small private OTN equipment combined with the operator OTN network, a wide area private OTN network is constructed;

[0024] In the embodiment of the present application, the special OTN device is placed at the end of the different OTN domains (between the OTN networks of different manufacturers or between the OTN networks of different operators) and the service access, the special OTN device can configure OTU-1, OTU-2 line interfaces according to the bandwidth needs of the special network, can be upgraded to higher capacity interfaces according to the needs, and the number of interfaces is configured according to the number of different OTN domains connected. The service interface is configured according to the type and number of service interfaces of the local site. The special OTN device realizes the management of the special OTN device across different manufacturer networks through a special network management technology, realizes end-to-end circuit scheduling and protection through the centralized calculation and management of the OTN special network management system, and the special OTN device supports the OTN and SDH cross matrix at the same time, so the cross granularity can be ODU level or VC level. The special OTN device adopts a special intelligent multi-channel management information processing technology, which can flexibly select OTN internal GCC overhead, 2M interface, serial interface, Ethernet interface as the network management channel, support in-band and out-of-band transmission mode, and realize the unified management and control of the special OTN device across the operator network domain.

[0025] The wide-area special OTN network can support end-to-end service scheduling and full-path protection recovery capabilities that cannot be realized by traditional OTN private lines, and has higher service isolation capability and security compared with a virtual private network based on a network layer.

[0026] S2 performs global management and control on the special OTN network based on the OTN special network management system independently developed and the multi-channel intelligent management and control module embedded in the special OTN device.

[0027] In the embodiment of the present application, the OTN special network management system realizes the unified management of the OTN special network across different manufacturer networks. Configuring the special OTN device at each domain boundary of the service path is the main feature of the present solution and is also the basis for realizing automatic scheduling and protection recovery of the whole service.

[0028] Network construction mode

[0029] The network topology construction mode is to first construct the topology of the special OTN network according to the service and bandwidth requirements, then apply for OTN private lines to the operators according to the topology connection and bandwidth requirements, and complete the construction and interconnection of the whole network topology. The applied OTN private line should be able to realize OTN overhead transmission to realize the traversal of management information, but since the wide-area networking may involve different operators and manufacturer devices, part of the private line may not be able to realize overhead transmission. At this time, the special OTN device needs to transmit management information in other ways, and the specific scheme is described in the management information processing mode part of the present application. The networking connection mode is shown in Figure 4Based on the service bandwidth requirements of the dedicated OTN network, some inter-domain link resources (OTU-1, OTU-2, or higher rates) are separated from the operator's inter-domain link interface. These links are used to connect the dedicated OTN equipment to the operator's network. (To simplify the diagram, the inter-domain links in the figure only show the links connected to the dedicated OTN equipment, and do not show the inter-domain interconnection links used by the operator itself.) Dedicated OTN equipment is configured at each domain boundary through which the service passes to ensure free access and flexible scheduling capabilities for all network services.

[0030] To achieve flexible service access and scheduling, dedicated OTN equipment supports ODU-level cross-connection (ODU1, ODU2) and VC-level cross-connection (VC4, VC12). High-speed interfaces (including OTU-1, OTU-2OTN interfaces, STM-1 / 4 / 16SDH interfaces, 10 / 100 / 1000M Ethernet interfaces, etc.) and low-speed 2M service interfaces can be configured according to service access and scheduling requirements. Each dedicated OTN device can be used as a service access or add / drop node, or a cross-connection node. Figure 4 The two dotted lines in the figure represent the service channel from node ② to node ③ via node ⑤, and the service channel from node ① to node ⑦ via nodes ⑤ and ④. Other services can also be established between any nodes as needed to meet different types of service access and intelligent scheduling requirements.

[0031] Control Plan

[0032] To build an OTN private network and implement intelligent management and control within the existing operator network, it is necessary to solve the problem of transmitting network management information across different operator networks and realize unified management of dedicated OTN equipment distributed between various sections. The existing OTN network's OSC (Optical Supervisory Channel) network management channel is generally used internally by each operator and cannot be used to transmit OTN private network management information. This solution combines three transmission methods to meet the management and control information transmission needs in different scenarios, such as Figure 5 shown.

[0033] When the operator can provide transparent OTU dedicated lines, use the GCC overhead of OTN to transmit control information; when the GCC overhead cannot be transparently transmitted and no external DCN (data communication network) network is available, the control information can be embedded in the VC12 (2M) service channel for transmission; when the external DCN network is available, consider using the DCN channel (based on Ethernet interface or serial interface) for transmission.

[0034] To support the above control information transmission mode, a multi-channel intelligent control module is embedded in the special OTN device, which supports both in-band and out-of-band control information processing, and can use GCC overhead, VC12 (2M) signal, serial signal and Ethernet as network management channel. Different network management channels can back up each other to improve reliability. The multi-channel intelligent control module is integrated in the device, which can directly extract the GCC overhead and VC12 (2M) channel in the transmission link as the network management channel. The network management channel has convergence and sharing functions, realizing the sharing of the same network management channel by different special OTN devices.

[0035] The principle of the multi-channel intelligent control module is shown in Figure 6 . The module is developed based on internal programmable logic devices of the device, and has a multi-port routing function. The multi-channel adaptation module can process control messages from GCC overhead, VC12 and DCN transmission, and each interface is protected from each other. When the channel fails, it can switch to the protection channel to ensure the smooth transmission of control information.

[0036] When using VC12 to transmit control information, there may be interruptions due to VC12 channel switching caused by service scheduling. Therefore, it is necessary to ensure that the VC12 channel used to transmit control information is not used to transmit service information and is not involved in service scheduling.

[0037] To realize end-to-end scheduling and protection recovery of services, the operator network domain information, reserved private line and connection link information of special OTN devices need to be included in the OTN private network management system database. Since the operator network pipeline (private line) of the service route is pre-set, only the cross matrix of the special OTN device needs to be configured during service scheduling and recovery.

[0038] In this scheme, the network topology is composed of operator domains and special OTN devices deployed between the domains. To realize end-to-end service scheduling, a special routing calculation method is adopted, which combines the link detection mechanism of special OTN devices and the abstraction of network topology to complete the path selection process.

[0039] For ease of description, based on the topology of the example Figure 4 in this paper, an example topology graph for path calculation is generated (see Figure 7 ). Figure 7 In the figure, each operator network domain is abstracted as an operator node, and the special OTN devices embedded between the operator domains and their links with the two sides of the operator are abstracted as network side links (including link ②, link ③, link ④, link ⑤, link ⑥), realizing the network interconnection between the abstracted nodes. Figure 7 In the figure, the source and destination nodes for service scheduling are assumed to be special OTN devices ① and ⑦ in Figure 4 , respectively. The links between these two nodes and the operator domain are user side links (Figure 7 Link 1 and Link 7.

[0040] Based on the example Figure 7 The service intelligent scheduling steps are as follows:

[0041] First, the special OTN device enables the link management protocol, detects the interconnection between nodes, and excludes the unavailable operator domain (virtual node) or the unavailable link.

[0042] Second, according to the service source (S) node and the terminal (D) node (the corresponding virtual nodes in the figure are A node and D node), the operator domain (virtual node) is calculated, the operator domain is determined according to the shortest path first principle, that is, the domain sequence is determined.

[0043] Third, according to the domain sequence determined, the special OTN device through which the service passes is determined. Since the network scheme has a mapping relationship between the operator domain and the special OTN device, after the domain sequence is determined, the OTN device through which the service passes can be determined through simple mapping. There is no need to calculate the path according to the independent topology of the special OTN device.

[0044] Fifth, according to the service demand, the cross connection instruction is issued on the special OTN device through which the service passes to establish the service channel.

[0045] When the service fails, the alarm information is collected by the special OTN device and reported to the OTN special network management system. The management system calculates a new service path (exclusion fault path), and issues the cross connection instruction to the special OTN device to establish a new channel, and realizes the recovery of the fault service.

[0046] The above only discloses a preferred embodiment of the method for constructing a special network and realizing intelligent management and control in a multi-domain OTN network, and of course cannot limit the scope of the rights of the present application. Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments are realized, and equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.

Claims

1. A method for building a private network and realizing intelligent management and control in a multi-domain OTN network, characterized in that: The following steps are involved: Based on customized small-scale dedicated OTN equipment combined with the operator's OTN network, a wide-area dedicated OTN network is built. The dedicated OTN equipment is deployed at the boundary of each operator network domain through which the service passes, and is configured with OTU-1 and OTU-2 line interfaces according to the bandwidth requirements of the dedicated network. It can be upgraded to higher-capacity interfaces as needed, and the number of interfaces is configured according to the number of different OTN domains connected. The dedicated OTN equipment can flexibly select OTN internal overhead, VC12 channel / 2M interface, serial interface and Ethernet interface as network management channels, support in-band and out-of-band transmission modes, and realize unified management of dedicated OTN equipment across operator network domains. Control, when the operator can provide transparent OTU dedicated lines, use OTN's GCC overhead to transmit control information; when GCC overhead cannot be transparently transmitted and no external DCN network is available, embed the control information into the VC12 service channel for transmission; when the external DCN network is available, use the DCN channel for transmission. The operator network through which the service passes needs to reserve bandwidth resources, and the dedicated OTN equipment is placed at the boundary of each operator network domain through which the service passes. Based on a proprietary routing calculation method, this method combines the dedicated OTN equipment link detection mechanism and the operator network topology abstraction to complete path selection and realize end-to-end service scheduling. Based on the independently developed OTN private network management system and the multi-channel intelligent management and control module embedded in the dedicated OTN equipment, the dedicated OTN network is fully managed and controlled; The steps for business intelligent scheduling are as follows: Dedicated OTN equipment enables link management protocols to detect the interconnection status between nodes and eliminate unavailable operator domains or unavailable links; Based on the service source node and end node, the operator domains passed through are calculated and determined according to the shortest path first principle, that is, the domain sequence is determined; Determine the dedicated OTN equipment that the service traverses based on the established domain sequence. This networking solution establishes a mapping relationship between the operator domain and dedicated OTN equipment. Once the domain sequence is determined, the OTN equipment that the service traverses can be determined through simple mapping, eliminating the need for path calculation based on the independent topology of the dedicated OTN equipment. According to business needs, cross-connection instructions are issued on the dedicated OTN equipment along the way to establish business channels; When a service failure occurs, the alarm information is collected by the dedicated OTN equipment and reported to the OTN private network management system. The management system calculates a new service path and issues a cross-connection instruction to the dedicated OTN equipment to establish a new channel to restore the failed service.

2. The method for constructing a private network and implementing intelligent management and control in a multi-domain OTN network according to claim 1, characterized in that: The dedicated OTN equipment and the operator's dedicated line business resources are brought under unified management and control to achieve end-to-end rapid scheduling of cross-domain services, rerouting and recovery in the event of service failure, and have independent operation, management and maintenance capabilities. After the wide-area dedicated OTN network is built, end-to-end service scheduling and service protection and recovery can be independently performed without conflicting with other operators' services.

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