CN109743211B - SDN-based IP network and optical network collaborative path opening system and method - Google Patents
SDN-based IP network and optical network collaborative path opening system and method Download PDFInfo
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Abstract
The invention discloses a system and a method for opening cooperative paths of an IP network and an optical network based on SDN, which fully utilize the characteristics of flexible IP network strategy configuration and optical network high-capacity service processing, and enable an IP network SDN controller to be responsible for collecting and processing global information, making and issuing network strategies, and enable an optical network SDN controller to be responsible for providing optical network information and realizing rapid path establishment through a pre-configuration method. The method reduces the complexity of the cooperation of the IP network and the optical network, improves the speed of opening the service path and improves the utilization rate of network resources.
Description
Technical Field
The invention relates to the field of data communication and optical network communication, in particular to an SDN-based IP network and optical network cooperative path opening system and method.
Background
The cooperative management and control of the IP network and the optical network is always a key problem of communication network development, if two networks which are independently planned, managed and operated can be cooperatively operated and maintained, the overall operation efficiency of the communication network can be greatly improved, and the overall construction and maintenance complexity and cost of the network can be greatly reduced.
The emergence of Software Defined Networking (SDN) provides a new solution for cooperative operation and maintenance of IP networks and optical networks. The SDN is a novel network technology, and its idea is to separate a control plane and a data forwarding plane of a network and implement programmable control. In an SDN-based network, the network device may employ general-purpose hardware; the original operating system responsible for control is abstracted into an independent network operating system which is responsible for adaptation to different service characteristics, and the communication among the network operating system, the service characteristics and the hardware equipment can be realized through programming.
Based on the above basis, the industry generally proposes that two networks cooperatively interact through a cooperation and arrangement mode between an IP network SDN controller and an optical network SDN controller, so as to quickly and efficiently implement service provisioning, link protection and fault processing. For example, patent application for rapid provisioning system and method for IP and optical network services (application number: 201810825806.2) proposes to set up an IP network controller and an optical network controller respectively, and construct a cooperative controller on the top of the rapid provisioning system for IP and optical network services, so that the IP network controller and the optical network controller can interact with the cooperative controller respectively, and then the cooperative controller can plan an optimal path uniformly, and control an IP network layer and an optical network layer at the same time. The invention provides an IP route processing method and device based on an ASON (advanced switch optical network) and an application number 201410306952.6, which utilize the automatic connection capacity of the optical network to optimize the selection of an IP route. The cooperative and unified control of the IP + optical network proposed by the thesis [3] [4] [5] takes an IP network SDN controller and an optical network SDN controller as starting points, and finally realizes the cooperative control of the IP network and the optical network through cooperative and unified control among the controllers.
The IP network and the optical network have respective characteristics in the aspects of construction, operation and maintenance and service processing. The IP service has uncertainty and unpredictability, the granularity of the IP service is large, and the requirement on the processing capacity of equipment is fine. The IP network has flexible networking, convenient service configuration and rapid strategy construction and issuing. In contrast, the granularity of optical network processing is large, service delivery and policy configuration are not convenient and fast enough due to the need of adapting to the optical device, and meanwhile, the frequent work of path establishment, policy configuration and the like is inconvenient.
Reference documents:
[1] the invention relates to a system and a method for rapidly opening IP and optical network services, which have the following application numbers: 201810825806.2
[2] The invention relates to an IP route processing method and device based on an ASON optical network, and the application number is as follows: 201410306952.6
[3] Research on a joint optimization technology of an IP network and an optical network based on SDN control [ D ]. beijing post and telecommunications university, 2015.
[4] Zhou, control technology research oriented to IP and optical network fusion [ D ]. Beijing post and telecommunications university, 2018.
[5] Wangtongshan, power service-oriented 'IP + optical' network cooperative unified control technology [ A ]. China Motor engineering society Power information professional Committee, digital China energy interconnection-2018 Power industry information annual meeting statement [ C ]. China Motor engineering society Power information professional Committee, China post and telecommunications publishing agency, telecommunication scientific editors, 2018:1.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an SDN-based IP network and optical network collaborative path opening system, which comprises an IP network SDN controller and an optical network SDN controller;
the IP network SDN controller and the optical network SDN controller respectively comprise SDN controllers;
the IP network SDN controller also comprises a service processing module, a resource analysis module A, a route calculation module and a strategy configuration module;
the service processing module receives a service application request from an upper layer through a north interface of an SDN controller in an IP network SDN controller, obtains source and destination node information and bandwidth requirements of a service path, and sends the source and destination node information and the bandwidth requirements to a route calculation module and a resource analysis module A;
the SDN controller northbound interface in the IP network SDN controller is located between the control plane and the application, network capacity and information provided by the SDN controller in the IP network SDN controller are abstracted and are opened to an application layer for use, and RESTful is a mainstream implementation mode of the northbound interface in the industry. The general service request includes the basic service source and destination node information, and other information such as service level, protection policy, service content, etc.
The resource analysis module A is used for counting the use state of the IP network equipment so as to obtain the use condition of the IP network resources;
the routing calculation module calculates a service transmission path according to optical network pre-configuration light path information, service path source and destination node information and IP network resource use conditions, and finally outputs routing information of the service in the IP network;
the strategy configuration module transmits the service routing information output by the routing calculation module to an IP router in a network through a southbound interface protocol so as to ensure the establishment of a transmission path;
the SDN controller also comprises a resource analysis module B, a pre-configuration module and a service opening module;
the resource analysis module B is used for collecting and analyzing the use condition of the optical network resources and distributing the use condition of the optical network resources to the IP network SDN controller and the pre-configuration module;
the pre-configuration module calculates a pre-configuration optical path according to the use condition of the optical network resource and records and stores a pre-configuration optical path table;
the service opening module is connected with the optical network equipment through a southbound interface protocol, a pre-configured optical path is set, and when an actual service request arrives, the pre-configured optical path is opened.
The resource analysis module a is configured to count a usage state of the IP network device, and specifically includes: the resource analysis module A collects device information of the router through a southbound interface of an SDN controller in the IP network SDN controller, wherein the device information comprises network nodes, interface types, physical links and port address information.
The resource analysis module A supports more than two southbound interface protocols, wherein the southbound interface protocols comprise SNMP protocol, NETFLOW protocol, SFLOW protocol and NetStream protocol.
The service path source and destination node information and the bandwidth requirement are provided by a service processing module, the use condition of IP network resources is provided by a resource analysis module A, and the optical network preconfigured optical path information is provided by an optical network SDN controller.
Because of the mapping relationship between the IP network and the optical network service, the optical network exists as a bearer channel for the IP data stream. The IP data is encapsulated into an optical signal suitable for being transmitted in the optical network at a source node of the optical layer, and after the pre-configured optical path is determined, the corresponding IP route is correspondingly set.
An SDN controller in the IP network SDN controller performs link discovery, topology management, strategy formulation and table item issuing operation through a southbound interface so as to complete the management and configuration of manufacturer equipment; the policy configuration module supports more than two southbound interface protocols, wherein the southbound interface protocols comprise an OPENFLOW protocol, a NETCONF protocol and a BGP protocol. The southbound protocol used by the policy configuration module is biased to send routing information finally calculated by the SDN controller to the routing equipment, and the southbound protocol used by the resource analysis module A is biased to collect and report the using states of the routing equipment and each link of the IP network to the SDN controller for the SDN controller to process and analyze;
the resource analysis module B is configured to collect and analyze an optical network resource usage and distribute the optical network resource usage to the IP network SDN controller and the provisioning module, and specifically includes: the resource analysis module B collects optical network equipment information through a southbound interface protocol comprising an SNMP protocol, wherein the southbound interface protocol comprises a network node, an interface type, a physical link and port address information, the resource analysis module B supports more than two southbound interface protocols, and the southbound interface protocols comprise an SNMP protocol, a NETFLOW protocol, an SFLOW protocol and a NetStream protocol.
The invention also discloses an SDN-based IP network and optical network collaborative path opening method, which comprises the following steps:
step 1: a resource analysis module B in the SDN controller of the optical network classifies the optical network resources;
step 2: a pre-configuration module in an optical network SDN controller calculates and sets an optical network pre-configuration optical path;
and step 3: an IP network SDN controller receives a service route establishment request and defines source and destination node information of service transmission;
and 4, step 4: if the existing pre-configured optical path can bear the service, entering step 6; if the pre-configured optical path does not meet the service requirement, entering step 5;
and 5: the method comprises the steps that an IP network SDN controller sends a service request to an optical network SDN controller, a pre-configuration module in the optical network SDN controller calculates a new pre-configuration optical path meeting bandwidth requirements according to the service request bandwidth, and feeds back the result to the IP network SDN controller;
step 6: the IP network SDN controller sets IP routing information according to the new pre-configured optical path meeting the bandwidth requirement and sends the IP routing information to the IP equipment;
and 7: establishing a service end-to-end path after the IP route and the optical route are set;
and 8: and the SDN controller of the optical network detects the occupation condition of the pre-configured light path, and the pre-configured module calculates and supplements a new pre-configured light path and updates the new pre-configured light path to the resource analysis module B and the resource analysis module A.
The step 1 comprises the following steps: dividing optical network resources into three types, wherein the first type is occupied optical path resources, namely resources used for bearing service transmission tasks; the second type is pre-configured light path resources, the resources are already allocated to the pre-configured light path, when the service needing to be carried is sent, the pre-configured light path is directly started, and the formal path establishment of the light path is completed; the third type is unused resources, which are later allocated to pre-configured lightpaths.
The step 2 comprises the following steps: a service provisioning module pre-configures an optical path for an optical network, wherein the pre-configured optical path refers to a corresponding optical path pre-configured in advance between two optical nodes, an optical network SDN controller informs an IP network SDN controller of information of the optical path pre-configured between the two optical nodes, when the two optical nodes actually generate a specific data transmission request, the IP network SDN controller calculates the IP path according to the pre-configured optical path and then processes and transmits data, at the moment, a pre-configured module of the SDN controller needs to maintain a pre-configured optical path table for calculating and storing path information and resource allocation conditions of the pre-configured optical path between any two optical nodes; when the preconfigured optical path between two optical nodes is used for carrying service and resources are occupied, a preconfigured module in the optical network SDN controller calculates and constructs a new preconfigured optical path in time according to the use condition of the whole network resources, and the calculation and update strategies of the preconfigured optical path are as follows:
step 2-1: counting the use condition of each light path resource, and setting a resource pre-occupation value alpha, namely the size of the occupied bandwidth of the pre-configured light path, wherein the alpha is recommended to be set at 5GB/s or higher; when the idle bandwidth of the optical path is lower than alpha, deleting the optical path from the network topology, and updating to generate a new optical network topology;
step 2-2: based on the optical network topology generated in the step 2-1, calculating paths for any two optical nodes by using a shortest path algorithm, if more than two shortest paths exist, selecting a section of link with the highest resource utilization rate on each shortest path for mutual comparison, and selecting a shortest path with a lower resource utilization rate as a pre-configuration optical path; and when the resources of the pre-configured light path are occupied, re-counting the use condition of each light path resource, and calculating and updating the pre-configured light path.
It should be noted that the optical nodes herein do not include the optical transmission transparent transmission nodes that are used only for relaying, amplifying or enhancing the optical signals, because these nodes do not generally have a mapping relationship with the IP nodes, and do not affect the setting of the IP network routing.
The invention provides the idea of 'IP scheduling is primary and optical network modification is secondary', and the optical network transmits information such as network topology information, resource utilization, service carrying capacity and the like to the IP network SDN controller through an interface, so that the IP network SDN controller can comprehensively judge and analyze the whole situation of the optical network and the IP network when the IP network SDN controller selects a new routing request, and further, an optimal service path is selected. Furthermore, the optical network adopts a strategy of pre-configuring the optical path, and can quickly and conveniently establish the optical network path when receiving the IP service path establishment request through the preset optical path connection.
The invention makes full use of the characteristics of flexible IP network strategy configuration and optical network large-capacity service processing, and enables the IP network SDN controller to be responsible for collecting and processing global information, making and issuing network strategies, and the optical network SDN controller to be responsible for providing network information and realizing rapid path establishment through a pre-configuration method. The method reduces the complexity of the cooperation of the IP network and the optical network, improves the speed of service opening, and improves the utilization rate of network resources.
Drawings
The foregoing and other advantages of the invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic diagram of an IP network and an optical network architecture.
FIG. 2 is a diagram of the various service processing modules necessary to implement the present invention.
Fig. 3 is a flow chart of service provisioning for cooperation between an IP network and an optical network.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
The invention provides an SDN-based IP network and optical network collaborative path opening system, which comprises an IP network SDN controller and an optical network SDN controller;
the IP network SDN controller and the optical network SDN controller respectively comprise SDN controllers;
the IP network SDN controller also comprises a service processing module, a resource analysis module A, a route calculation module and a strategy configuration module;
the service processing module receives a service application request from an upper layer through a north interface of an SDN controller in an IP network SDN controller, obtains source and destination node information and bandwidth requirements of a service path, and sends the source and destination node information and the bandwidth requirements to a route calculation module and a resource analysis module A;
the SDN controller northbound interface in the IP network SDN controller is located between the control plane and the application, network capacity and information provided by the SDN controller in the IP network SDN controller are abstracted and are opened to an application layer for use, and RESTful is a mainstream implementation mode of the northbound interface in the industry. The general service request includes the basic service source and destination node information, and other information such as service level, protection policy, service content, etc.
The resource analysis module A is used for counting the use state of the IP network equipment so as to obtain the use condition of the IP network resources;
the routing calculation module calculates a service transmission path according to optical network pre-configuration light path information, service path source and destination node information and IP network resource use conditions, and finally outputs routing information of the service in the IP network;
the strategy configuration module transmits the service routing information output by the routing calculation module to an IP router in a network through a southbound interface protocol so as to ensure the establishment of a transmission path;
the SDN controller also comprises a resource analysis module B, a pre-configuration module and a service opening module;
the resource analysis module B is used for collecting and analyzing the use condition of the optical network resources and distributing the use condition of the optical network resources to the IP network SDN controller and the pre-configuration module;
the pre-configuration module calculates a pre-configuration optical path according to the use condition of the optical network resource and records and stores a pre-configuration optical path table;
the service opening module is connected with the optical network equipment through a southbound interface protocol, a pre-configured optical path is set, and when an actual service request arrives, the pre-configured optical path is opened.
The resource analysis module a is configured to count a usage state of the IP network device, and specifically includes: the resource analysis module A collects device information of the router through a southbound interface of an SDN controller in the IP network SDN controller, wherein the device information comprises network nodes, interface types, physical links and port address information.
The resource analysis module A supports more than two southbound interface protocols, wherein the southbound interface protocols comprise SNMP protocol, NETFLOW protocol, SFLOW protocol and NetStream protocol.
The service path source and destination node information and the bandwidth requirement are provided by a service processing module, the use condition of IP network resources is provided by a resource analysis module A, and the optical network preconfigured optical path information is provided by an optical network SDN controller.
Because of the mapping relationship between the IP network and the optical network service, the optical network exists as a bearer channel for the IP data stream. The IP data is encapsulated into an optical signal suitable for being transmitted in the optical network at a source node of the optical layer, and after the pre-configured optical path is determined, the corresponding IP route is correspondingly set.
An SDN controller in the IP network SDN controller performs link discovery, topology management, strategy formulation and table item issuing operation through a southbound interface so as to complete the management and configuration of manufacturer equipment; the policy configuration module supports more than two southbound interface protocols, wherein the southbound interface protocols comprise an OPENFLOW protocol, a NETCONF protocol and a BGP protocol. The southbound protocol used by the policy configuration module is biased to send routing information finally calculated by the SDN controller to the routing equipment, and the southbound protocol used by the resource analysis module A is biased to collect and report the using states of the routing equipment and each link of the IP network to the SDN controller for the SDN controller to process and analyze;
the resource analysis module B is configured to collect and analyze an optical network resource usage and distribute the optical network resource usage to the IP network SDN controller and the provisioning module, and specifically includes: the resource analysis module B collects optical network equipment information through a southbound interface protocol comprising an SNMP protocol, wherein the southbound interface protocol comprises a network node, an interface type, a physical link and port address information, the resource analysis module B supports more than two southbound interface protocols, and the southbound interface protocols comprise an SNMP protocol, a NETFLOW protocol, an SFLOW protocol and a NetStream protocol.
The invention also discloses an SDN-based IP network and optical network collaborative path opening method, which comprises the following steps:
step 1: a resource analysis module B in the SDN controller of the optical network classifies the optical network resources;
step 2: a pre-configuration module in an optical network SDN controller calculates and sets an optical network pre-configuration optical path;
and step 3: an IP network SDN controller receives a service route establishment request and defines source and destination node information of service transmission;
and 4, step 4: if the existing pre-configured optical path can bear the service, entering step 6; if the pre-configured optical path does not meet the service requirement, entering step 5;
and 5: the method comprises the steps that an IP network SDN controller sends a service request to an optical network SDN controller, a pre-configuration module in the optical network SDN controller calculates a new pre-configuration optical path meeting bandwidth requirements according to the service request bandwidth, and feeds back the result to the IP network SDN controller;
step 6: the IP network SDN controller sets IP routing information according to the new pre-configured optical path meeting the bandwidth requirement and sends the IP routing information to the IP equipment;
and 7: establishing a service end-to-end path after the IP route and the optical route are set;
and 8: and the SDN controller of the optical network detects the occupation condition of the pre-configured light path, and the pre-configured module calculates and supplements a new pre-configured light path and updates the new pre-configured light path to the resource analysis module B and the resource analysis module A.
The step 1 comprises the following steps: dividing optical network resources into three types, wherein the first type is occupied optical path resources, namely resources used for bearing service transmission tasks; the second type is pre-configured light path resources, the resources are already allocated to the pre-configured light path, when the service needing to be carried is sent, the pre-configured light path is directly started, and the formal path establishment of the light path is completed; the third type is unused resources, which are later allocated to pre-configured lightpaths.
The step 2 comprises the following steps: a service provisioning module pre-configures an optical path for an optical network, wherein the pre-configured optical path refers to a corresponding optical path pre-configured in advance between two optical nodes, an optical network SDN controller informs an IP network SDN controller of information of the optical path pre-configured between the two optical nodes, when the two optical nodes actually generate a specific data transmission request, the IP network SDN controller calculates the IP path according to the pre-configured optical path and then processes and transmits data, at the moment, a pre-configured module of the SDN controller needs to maintain a pre-configured optical path table for calculating and storing path information and resource allocation conditions of the pre-configured optical path between any two optical nodes; when the preconfigured optical path between two optical nodes is used for carrying service and resources are occupied, a preconfigured module in the optical network SDN controller calculates and constructs a new preconfigured optical path in time according to the use condition of the whole network resources, and the calculation and update strategies of the preconfigured optical path are as follows:
step 2-1: counting the use condition of each light path resource, and setting a resource pre-occupation value alpha, namely the size of the occupied bandwidth of the pre-configured light path, wherein the alpha is recommended to be set at 5GB/s or higher; when the idle bandwidth of the optical path is lower than alpha, deleting the optical path from the network topology, and updating to generate a new optical network topology;
step 2-2: based on the optical network topology generated in the step 2-1, calculating paths for any two optical nodes by using a shortest path algorithm, if more than two shortest paths exist, selecting a section of link with the highest resource utilization rate on each shortest path for mutual comparison, and selecting a shortest path with a lower resource utilization rate as a pre-configuration optical path; and when the resources of the pre-configured light path are occupied, re-counting the use condition of each light path resource, and calculating and updating the pre-configured light path.
It should be noted that the optical nodes herein do not include the optical transmission transparent transmission nodes that are used only for relaying, amplifying or enhancing the optical signals, because these nodes do not generally have a mapping relationship with the IP nodes, and do not affect the setting of the IP network routing.
Examples
Various data transmission service requirements exist in the network, such as distribution and backup of data between data centers, interaction of data between nodes of an enterprise, opening of a dedicated transmission line between nodes of a telecommunication network, and the like. Taking fig. 1 as an example, each node in the IP network is set as a core router in the telecommunication network, and there is a requirement for establishing a dedicated transmission line between each node and the core router. Generally, data equipment and optical transmission equipment are connected back-to-back in a telecommunications network so that IP data can be encapsulated into optical signals for transmission in an optical network. At this time, the data device and the optical transmission device have a mapping relationship, and in fig. 1, a-a, B-B, C-E, D-D, E-g, and F-h indicate a mapping connection relationship between the data device and the optical transmission device. The nodes c and f in the optical network are optical transmission relay nodes, and are not taken into consideration when the optical network carries out pre-configuration optical path calculation.
Based on the method provided by the invention, a resource analysis module A acquires the model of router equipment through an SDN southward interface protocol, wherein the model of the router equipment generally comprises Huacheng NE5000E, Cisco CRS or Alang 7750 equipment; collecting the number and the type of ports of the router, namely 10GE ports or 40GE ports, and the service condition of each port; and in the case of connection between routers, the next hop is which node. Similarly, the resource analysis module B collects the device type, the utilization rate, the connection condition, and the like of the transmission device through the southbound interface protocol.
Taking fig. 1 as an example, the strategy proposed by the present invention is specifically explained by the basic application of establishing a transmission path between two points. First, the optical network calculates a pre-configured optical path between two optical nodes. For example, two shortest paths between a and h are (a-e-g-h) (a → b → d → (f) → h), and since the f node is a relay node, the number of formal hops is not calculated. The link with the highest resource utilization rate in the path (a-e-g-h) is (a-e) 55%, and the link with the highest resource utilization rate in the path (a → b → d → (f) → h) is (a-b) 58%. The path (a-e-g-h) is selected as a preconfigured optical path with a bandwidth of 5GB/s, which is synchronized to the IP network SDN controller and the optical network SDN controller. This pre-configured lightpath may provide a transmission lightpath for data streaming of a-F nodes in an IP network.
When an IP network SDN controller receives an A-F node service routing request, through finding that pre-configured optical paths a-h exist, the IP network SDN controller notifies that the optical network SDN controller needs to occupy the optical path transmission service, and meanwhile, a newly-built IP routing table is set as A according to the information of the pre-configured optical paths: (A → C → E → F).
When a preconfigured optical path (a → e → g → h) between a and h is occupied, the SDN controller of the optical network updates the resource usage, and finds that the usage rate of the optical path is already high at this time, and cannot provide a bandwidth larger than 5GB/s, a preconfigured optical path is recalculated, and the shortest path is (a → B → d → (f) → h), then the preconfigured optical path is constructed as B: and (a → b → d → F → h), and the bandwidth is 5GB/s, so as to serve as a data flow transmission optical path of the A-F node in the IP network, and distribute and inform the data flow transmission optical path to the SDN controller of the IP network.
When the IP network SDN controller receives a new A-F node service route establishment request again, the pre-configuration optical path B is used: (a → B → d → (f) → h), while the newly created IP routing table is set to B: (A → B → D → F).
The present invention provides a system and a method for opening a path in cooperation between an IP network and an optical network based on an SDN, and a method and a device for implementing the technical scheme are many, the above description is only a preferred embodiment of the present invention, and it should be noted that, for a person having ordinary skill in the art, a number of improvements and modifications may be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (3)
1. The SDN-based IP network and optical network collaborative path opening system is characterized by comprising an IP network SDN controller and an optical network SDN controller;
the IP network SDN controller and the optical network SDN controller respectively comprise SDN controllers;
the IP network SDN controller also comprises a service processing module, a resource analysis module A, a route calculation module and a strategy configuration module;
the service processing module receives a service application request from an upper layer through a north interface of an SDN controller in an IP network SDN controller, obtains source and destination node information and bandwidth requirements of a service path, and sends the source and destination node information and the bandwidth requirements to a route calculation module and a resource analysis module A;
the resource analysis module A is used for counting the use state of the IP network equipment so as to obtain the use condition of the IP network resources;
the routing calculation module calculates a service transmission path according to optical network pre-configuration light path information, service path source and destination node information and IP network resource use conditions, and finally outputs routing information of the service in the IP network;
the strategy configuration module transmits the service routing information output by the routing calculation module to an IP router in a network through a southbound interface protocol so as to ensure the establishment of a transmission path;
the SDN controller also comprises a resource analysis module B, a pre-configuration module and a service opening module;
the resource analysis module B is used for collecting and analyzing the use condition of the optical network resources and distributing the use condition of the optical network resources to the IP network SDN controller and the pre-configuration module;
the pre-configuration module calculates a pre-configuration optical path according to the use condition of the optical network resource and records and stores a pre-configuration optical path table;
the service opening module is connected with the optical network equipment through a southbound interface protocol, a pre-configured optical path is set, and when an actual service request arrives, the pre-configured optical path is opened;
the resource analysis module a is configured to count a usage state of the IP network device, and specifically includes: the resource analysis module A acquires equipment information of the router through a southbound interface of an SDN controller in an IP network SDN controller, wherein the equipment information comprises network nodes, interface types, physical links and port address information;
the resource analysis module A supports more than two southbound interface protocols, wherein the southbound interface protocols comprise SNMP protocol, NETFLOW protocol, SFLOW protocol and NetStream protocol;
the service path source and destination node information and bandwidth requirements are provided by a service processing module, the use condition of IP network resources is provided by a resource analysis module A, and the optical network preconfigured optical path information is provided by an optical network SDN controller;
an SDN controller in the IP network SDN controller performs link discovery, topology management, strategy formulation and table item issuing operation through a southbound interface so as to complete the management and configuration of manufacturer equipment; the policy configuration module supports more than two southbound interface protocols, wherein the southbound interface protocols comprise an OPENFLOW protocol, a NETCONF protocol and a BGP protocol;
the resource analysis module B is configured to collect and analyze an optical network resource usage and distribute the optical network resource usage to the IP network SDN controller and the provisioning module, and specifically includes: the resource analysis module B collects optical network equipment information through a southbound interface protocol comprising an SNMP protocol, wherein the information comprises network nodes, interface types, physical links and port address information, the resource analysis module B supports more than two southbound interface protocols, and the southbound interface protocols comprise an SNMP protocol, a NETFLOW protocol, an SFLOW protocol and a NetStream protocol;
the system performs the following steps:
step 1: a resource analysis module B in the SDN controller of the optical network classifies the optical network resources;
step 2: a pre-configuration module in an optical network SDN controller calculates and sets an optical network pre-configuration optical path;
and step 3: an IP network SDN controller receives a service route establishment request and defines source and destination node information of service transmission;
and 4, step 4: if the existing pre-configured optical path can bear the service, entering step 6; if the pre-configured optical path does not meet the service requirement, entering step 5;
and 5: the method comprises the steps that an IP network SDN controller sends a service request to an optical network SDN controller, a pre-configuration module in the optical network SDN controller calculates a new pre-configuration optical path meeting bandwidth requirements according to the service request bandwidth, and feeds back the result to the IP network SDN controller;
step 6: the IP network SDN controller sets IP routing information according to the new pre-configured optical path meeting the bandwidth requirement and sends the IP routing information to the IP equipment;
and 7: establishing a service end-to-end path after the IP route and the optical route are set;
and 8: and the SDN controller of the optical network detects the occupation condition of the pre-configured light path, and the pre-configured module calculates and supplements a new pre-configured light path and updates the new pre-configured light path to the resource analysis module B and the resource analysis module A.
2. The system of claim 1, wherein step 1 comprises: dividing optical network resources into three types, wherein the first type is occupied optical path resources, namely resources used for bearing service transmission tasks; the second type is pre-configured light path resources, the resources are already allocated to the pre-configured light path, when the service needing to be carried is sent, the pre-configured light path is directly started, and the formal path establishment of the light path is completed; the third type is unused resources, which are later allocated to pre-configured lightpaths.
3. The system of claim 2, wherein step 2 comprises: a service provisioning module pre-configures an optical path for an optical network, wherein the pre-configured optical path refers to a corresponding optical path pre-configured in advance between two optical nodes, an optical network SDN controller informs an IP network SDN controller of information of the optical path pre-configured between the two optical nodes, when the two optical nodes actually generate a specific data transmission request, the IP network SDN controller calculates the IP path according to the pre-configured optical path and then processes and transmits data, at the moment, a pre-configured module of the SDN controller needs to maintain a pre-configured optical path table for calculating and storing path information and resource allocation conditions of the pre-configured optical path between any two optical nodes; when the preconfigured optical path between two optical nodes is used for carrying service and resources are occupied, a preconfigured module in the optical network SDN controller calculates and constructs a new preconfigured optical path in time according to the use condition of the whole network resources, and the calculation and update strategies of the preconfigured optical path are as follows:
step 2-1: counting the use condition of each light path resource, and setting a resource pre-occupation value alpha, namely pre-configuring the size of the occupied bandwidth of the light path; when the idle bandwidth of the optical path is lower than alpha, deleting the optical path from the network topology, and updating to generate a new optical network topology;
step 2-2: based on the optical network topology generated in the step 2-1, calculating paths for any two optical nodes by using a shortest path algorithm, if more than two shortest paths exist, selecting a section of link with the highest resource utilization rate on each shortest path for mutual comparison, and selecting a shortest path with a lower resource utilization rate as a pre-configuration optical path; and when the resources of the pre-configured light path are occupied, re-counting the use condition of each light path resource, and calculating and updating the pre-configured light path.
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