CN109274589B

CN109274589B - Service transmission method and device

Info

Publication number: CN109274589B
Application number: CN201810864668.9A
Authority: CN
Inventors: 殷昭印
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2018-08-01
Filing date: 2018-08-01
Publication date: 2021-03-02
Anticipated expiration: 2038-08-01
Also published as: CN109274589A

Abstract

The application provides a service transmission method and a service transmission device, relates to the field of communication, and is used for improving end-to-end service quality. The method comprises the following steps: the switching node determines the service type of the service to be transmitted; if the service type is a first type, forwarding the service to be transmitted according to a first flow table item; the first flow table entry is generated by the SDN controller according to a preset path, where the preset path includes the switching node, and the preset path is a transmission path that is established in advance and used for transmitting the first type of service; and if the service type is the second type, forwarding the service to be transmitted according to a second flow table item. Therefore, the service transmission method can improve the end-to-end service quality of the first type service.

Description

Service transmission method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for service transmission.

Background

As the demand of users on the network increases, the size of the Data Center Inter-connection (DCI) network is continuously expanded, and the Quality of Service (QoS) requirements of users on the DCI network from end to end are higher and higher.

In the current DCI network, the QoS guarantee of the critical service is generally implemented by using differentiated services (DiffServ) + light load. In the DiffServ model, traffic flows are divided into different differentiated service classes. The differentiated services class of a traffic flow is represented by a differentiated services label field (DSCP) in its Internet Protocol (IP) header. In a DCI network deploying DiffServ, each router executes a corresponding Hop-by-Hop Behavior (Per Hop Behavior, PHB) according to a DSCP field of a packet. The DiffServ model itself cannot realize end-to-end QoS, and when high-priority flows are converged in some links, the phenomena of sharply increased network delay, even packet loss and the like occur. In order to ensure the network quality, operators generally adopt a light-load network construction idea, that is, redundant bandwidth is used to replace the service quality. However, in operation and maintenance of a large network, the whole network is lightly loaded and local links are congested, which may cause the link quality of the network to be greatly reduced. Therefore, the DiffServ + light load mode cannot provide end-to-end QoS, and also has the disadvantages of a large amount of bandwidth resource waste and high network construction cost.

Disclosure of Invention

The application provides a service transmission method, which can improve the end-to-end service quality in the service transmission process of a DCI network, reduce the working pressure of an SDN controller, improve the bandwidth utilization rate and reduce the network construction cost.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, the present application provides a service transmission method, including: the switching node determines the service type of the service to be transmitted; the service type is obtained by classifying services in advance according to users; if the service type is a first type, forwarding the service to be transmitted according to a first flow table item; the first flow table entry is generated by the SDN controller according to a preset path, where the preset path includes the switching node, and the preset path is a transmission path that is established in advance and used for transmitting the first type of service; if the service type is a second type, forwarding the service to be transmitted according to a second flow table item; wherein the second flow entry is generated by the SDN controller according to a routing path; the routing path includes the switching node, and the routing path is a transmission path calculated by the SDN controller according to a preset algorithm.

In a second aspect, the present application provides another service transmission method, including: the SDN controller acquires the establishment parameters of a preset path; the preset path is a transmission path which meets the QoS requirement of the first type of service; the preset path comprises at least one switching node; the establishing parameters comprise: a source address set, a destination address set, a source access node, a destination access node and QoS parameters; the source address set is a set formed by source addresses of services transmitted through the preset path; the destination address set is a set formed by destination addresses of services transmitted through the preset path; the source access node is an access node for accessing a source network to the DCI network; the destination access node is an access node for accessing the destination network to the DCI network; the QoS parameters comprise the bandwidth of the first type of service requirement, the time delay of the first type of service requirement and the priority of the first type of service; the SDN controller determines the preset path matched with the establishment parameters according to the allocable bandwidth of all links in the DCI network; the SDN controller generates a first flow table item corresponding to the preset path; and the SDN controller issues the first flow table item to each switching node contained in the preset path.

In a third aspect, the present application provides an apparatus for service transmission, where the apparatus includes: the processing module is used for determining the service type of the service to be transmitted; the service type is obtained by classifying services in advance according to users; if the service type is a first type, forwarding the service to be transmitted according to a first flow table item; the first flow table entry is generated by the SDN controller according to a preset path, where the preset path includes the switching node, and the preset path is a transmission path that is established in advance and used for transmitting the first type of service; if the service type is a second type, the processing module is further configured to forward the service to be transmitted according to a second flow entry; wherein the second flow entry is generated by the SDN controller according to a routing path; the routing path includes the switching node, and the routing path is a transmission path calculated by the SDN controller according to a preset algorithm.

In a fourth aspect, the present application provides another apparatus for service transmission, including: the acquisition module is used for acquiring the establishment parameters of the preset path; the preset path is a transmission path which meets the QoS requirement of the first type of service; the preset path comprises at least one switching node; the establishing parameters comprise: a source address set, a destination address set, a source access node, a destination access node and QoS parameters; the source address set is a set formed by source addresses of services transmitted through the preset path; the destination address set is a set formed by destination addresses of services transmitted through the preset path; the source access node is an access node for accessing a source network to the DCI network; the destination access node is an access node for accessing the destination network to the DCI network; the QoS parameters comprise the bandwidth of the first type of service requirement, the time delay of the first type of service requirement and the priority of the first type of service; a processing module, configured to determine the preset path matched with the establishment parameter according to the allocable bandwidths of all links in the DCI network; generating a first flow table item corresponding to the preset path; and the sending module is used for sending the first flow table item to each switching node contained in the preset path.

In a fifth aspect, the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by a computer, the computer executes the service transmission method according to the first aspect.

In a sixth aspect, the present application provides a service delivery system comprising a SDN controller, at least one switching node, at least one source network, and at least one destination network, the switching node being configured to perform the method of the first aspect, and the SDN controller being configured to perform the method of the second aspect.

According to the service transmission method, device and system, the SDN controller establishes a preset path for the first type of service and calculates a routing path for the second type of service. The first type and the second type are obtained by classifying services in advance according to users. Thus, when the services are transmitted in the DCI network, the switching node identifies the service type of the services to be transmitted, so that the services of the first type are forwarded along the preset path, and the services of the second type are forwarded along the calculated routing path. In the embodiment of the present application, a preset path is established for a first type of service, so that the preset path can be specially used for transmitting the first type of service, and thus when the method provided in the embodiment of the present application is applied to transmitting services with high QoS requirements and the like, the services can be divided into the first type of service, and therefore the service transmission method of the present application can improve the end-to-end service quality for the first type of service.

Drawings

Fig. 1 is a schematic diagram of a service transmission system applied to a method for service transmission according to an embodiment of the present application;

fig. 2 is a flowchart of a method for service transmission according to an embodiment of the present application;

fig. 3 is a flowchart of another service transmission method according to an embodiment of the present application;

fig. 4 is a flowchart of another service transmission method according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a service transmission apparatus applied to a switching node according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another service transmission apparatus applied to a switching node according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a service transmission apparatus applied to an SDN controller according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another service transmission apparatus applied to a switching node according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of another service transmission apparatus applied to an SDN controller according to an embodiment of the present application.

Detailed Description

The method, system and apparatus for service transmission provided by the present application will be described in detail below with reference to the accompanying drawings.

The terms "first" and "second", etc. in the description and drawings of the present application are used for distinguishing between different objects and not for describing a particular order of the objects.

Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the description of the present application, the meaning of "a plurality" means two or more unless otherwise specified.

The service transmission method provided by the embodiment of the application can be applied to the scenes of Data Center (DC) interconnection, dual-activity and disaster recovery, load sharing, enterprise headquarters and branch network interconnection, enterprise network and Data Center interconnection to construct a hybrid cloud, terminal users accessing the Data Center and the like.

The service transmission method provided in the embodiment of the present application is applied to the service transmission system 100 shown in fig. 1, where the service transmission system 100 includes: a DCI network, at least one source network, and at least one destination network.

The source network is a network for generating and initiating service transmission, and the destination network is a network for receiving service. Traffic is routed from the source network through the DCI network to the destination network. In the service transmission process, the DCI network is responsible for routing assignment, flow control, and the like of the transmitted service.

Illustratively, DCI networks are applied to internetworking between headquarters and branches of an enterprise. When a branch network (source network) sends a service to be transmitted to a headquarters network (destination network), the branch network sends the service to be transmitted to a DCI network; the DCI network sends the service to be transmitted to the headquarters network.

The DCI Network is composed of a Software Defined Network (SDN) controller 101 and a switching node 21.

The SDN technology can realize centralized and flexible control of all traffic in the network, and the SDN controller monitors information such as bandwidth, time delay and packet loss rate of all links in the network in real time and selects an optimal path for service traffic. Therefore, in the embodiments of the present application, an SDN controller is introduced in a DCI network. The SDN controller 101 is configured to collect link information in the DCI network, establish a preset path for a service to be transmitted, or calculate a transmission path, so that the service to be transmitted is transmitted according to the preset path or the transmission path obtained through calculation. Specifically, the service to be transmitted is divided into a first type and a second type according to the transmission requirements of users (such as enterprise users, data center users, and the like) on the service. Illustratively, the transmission requirements include requirements of time delay, bandwidth, packet loss rate, and the like. If the user has a high demand for the service to be transmitted in the DCI network, the SDN controller 101 may be requested to determine a dedicated path (described as a preset path in the embodiment of the present application) in advance in the DCI network to transmit its service. In consideration of the requirements of different users, a plurality of preset paths may exist in the DCI network, and the preset paths correspond to services of different users respectively. Then, the first type of traffic is traffic transmitted in a predetermined path in the DCI network, that is, for traffic that needs to be transmitted in the same predetermined path, the traffic has the same source address and destination address. Thus, the first type of traffic is transmitted from the source network to the destination network via the predetermined path. The second type of service is other services which are not transmitted through any preset path, and the transmission path of the type of service is calculated by the SDN controller during specific transmission.

The switching node 21 comprises a source access node 211, a generic switching node 212 and a destination access node 213.

The source access node 211 is an access node for accessing the source network to the DCI network, the destination access node 213 is an access node for accessing the destination network to the DCI network, and the common switching node is another switching node in the DCI network. The source access node 211, the common switching node 212, and the destination access node 213 receive the flow table items issued from the SDN controller 101, and forward the service data according to the flow table items. Specifically, when the service to be transmitted is of the first type, the flow table entry is used to indicate that the service to be transmitted is sequentially forwarded in each switching node included in the preset path until the service to be transmitted reaches the destination network. When the service to be transmitted is of the second type, the flow table entry is used to indicate that the service to be transmitted is sequentially forwarded in each switching node included in the routing path calculated by the SDN controller 101 until the service to be transmitted is in the destination network.

The source network and the destination network respectively comprise at least one terminal, and the terminal in the source network is used for sending a service resource request; the terminal in the destination network is used for responding to the service resource request of the terminal in the source network.

The embodiment of the application provides a service transmission method, which is applied to a service transmission system shown in fig. 1.

As shown in FIG. 2, the method includes S1-S3:

s1, the switching node determines the service type of the service to be transmitted.

The service to be transmitted is a service which is sent by a source network and needs to be transmitted in a DCI network. The service types include a first type and a second type. As described above, the first type and the second type are obtained by dividing according to the user requirement. Traffic of the first type can be transmitted in a preset path in the DCI network. The second type of traffic is not transmitted in any predetermined path in the DCI network.

For example, in a cross-regional enterprise, where broadband high-speed interconnection needs exist between each enterprise branch and an enterprise headquarters, the enterprise user may apply for establishing a preset path with a certain bandwidth between each enterprise branch and the enterprise headquarters. Then, for the traffic transmitted between the enterprise branch office and the enterprise head office through the pre-established preset path, the embodiment of the present application is described as the first type of traffic. For other services, such as services transmitted between an enterprise branch and the internet, embodiments of the present application are described as a second type of service.

If the service type is the first type, the following S2 is performed. If the service type is the second type, the following S3 is performed.

And S2, if the service type is the first type, forwarding the service to be transmitted according to the first flow table item.

The first flow table entry is generated by the SDN controller according to a preset path, where the preset path includes the switching node, and the preset path is a transmission path that is established in advance and used for transmitting the first type of service; the first type of traffic may be forwarded in turn in all switching nodes receiving said first flow entry. When the preset path exists, the first flow table entry is in an active state, and when the preset path is deleted, the first flow table entry is also deleted at the same time.

Specifically, a user configures preset path parameters through a network server or other modes; after configuration is completed, the request for establishing the preset path is sent to a northbound interface of the SDN controller; the SDN controller establishes a preset path according to the received establishment parameters; and the SDN controller generates the first flow table according to the preset path and issues the first flow table to each switching node in the preset path. The method for establishing the preset path is detailed in each of steps S301 to S306 shown in fig. 3.

And S3, if the service type is the second type, forwarding the service to be transmitted according to the second flow table item.

Wherein the second flow entry is generated by the SDN controller according to a routing path; the routing path includes the switching node, and the routing path is a transmission path calculated by the SDN controller according to a preset algorithm.

Specifically, when the service to be transmitted is a second type of service, the SDN controller determines a routing path according to a preset algorithm. And then, the SDN controller generates a second flow table item according to the routing path and sends the second flow table item to each switching node in the routing path. The traffic of the second type may be forwarded in turn in all switching nodes receiving said second flow entry. The second flow table entry is provided with timeout time, and when the timeout time is exceeded, the second flow table entry is deleted.

Illustratively, the preset algorithm may be Dijkstra algorithm. Specifically, it is each link e in all links in DCI network^′Weight (e) is constructed^′) Weight (e)^′) A parameter of whether the link can be a component link of the second type of traffic routing path.

In particular, the method comprises the following steps of,

wherein, M represents the maximum bandwidth supported by all links in the DCI network; load (e)^′) For link e^′Average load within a preset time; b is_avail(e^′) For link e^′The allocable bandwidth of (a); b is_max(e^′) For link e^′Maximum bandwidth of; beta is a weight value adjusting parameter. The value of beta is between (0, 1), and the most appropriate weight (e) is selected by adjusting the beta^′) And when the SDN controller selects a path for the second type of service in the DCI network, the SDN controller can avoid the link with concentrated first type of service flow and avoid the link with heavy load.

In the process of executing the foregoing S1 to S3, the SDN controller issues a transmission path (which may be a preset path for transmitting the first type of service, or may be a routing path for transmitting the second type of service) of the service to be transmitted to each corresponding switching node, so that each switching node transmits the service according to the transmission path. Specifically, the source network sends the service to be transmitted to the source access node, and the source access node forwards the service to be transmitted to other access nodes according to a specific transmission path. Steps S401 to S404 shown in fig. 4 are performed between the respective switching nodes for forwarding the traffic to transmit the traffic.

S401, the switching node determines the type and QoS requirement of the service to be transmitted.

The service to be transmitted is divided into a first type of delay sensitive service, a first type of bandwidth guarantee service, a first type of common service, a second type of delay sensitive service and a second type of common service. The delay sensitive service is a service with higher requirement on network time delay; the bandwidth guarantee service has low requirement on time delay, but needs a certain bandwidth guarantee; the common service is a service which does not require time delay and bandwidth.

S402, the switching node determines a transmission queue for transmitting the service to be transmitted according to the service type and QoS requirement of the service to be transmitted.

Specifically, the source access node is pre-configured with a service type of a service to be transmitted and a method for converting between QoS requirements and a service transmission queue. And when the switching node identifies the priority of the service to be transmitted, determining the transmission queues of various services in the service to be transmitted according to a pre-configured conversion method.

S403, the source access node and the common switching node forward the service to be transmitted to the destination access node according to the priority of the transmission queue.

Specifically, after completing the conversion between the service type of the service to be transmitted and the QoS requirement and the service transmission queue, the source access node sequentially forwards the transmission queue along the common switching node according to the priority. The common switching node can identify the priority of the transmission queue and enables the transmission queue to be sent according to the priority; up to the destination access node.

S404, the destination access node converts the service transmission queue into the service with the type different from the QoS requirement according to the conversion method, and sends the service to the destination network.

Specifically, the destination access node acquires a service transmission queue. A conversion method between a service transmission queue and a service type and QoS requirement of a service to be transmitted is pre-configured in a target access node; the destination access node converts the service transmission queue into service with different type and QoS requirement according to the conversion method, and sends the service to the destination network.

Optionally, the method for sorting the priority of the service transmission queue in S403 includes:

the priority level of the transmission queue corresponding to the first type of delay-sensitive service is P1; the transmission queue corresponding to the first type of bandwidth guarantee service has two different priority levels P2, P3. The first type of bandwidth guarantee service has low requirement on the bandwidth guarantee service, but packet loss is not allowed, so that the transmission queue corresponding to the first type of bandwidth guarantee service is set with two priority levels. When the transmission queue of the first type of bandwidth guarantee service does not exceed the preset threshold, the priority level of the transmission queue corresponding to the first type of bandwidth guarantee service is P3, and at the moment, the second type of delay sensitive service is preferentially sent. And when the transmission queue exceeds a preset threshold value, adjusting the priority level of the transmission queue corresponding to the first type of bandwidth guarantee service to be P2, and preferentially sending the first type of bandwidth guarantee service. The priority level of the transmission queue corresponding to the second type of delay sensitive service is P4. The priority levels of the transmission queues corresponding to the first type and the second type of common services are P5. The priority levels are arranged in the order from high to low: p1> P2> P4> P3> P5.

The method for adjusting the priority of the transmission queue of the first type of bandwidth guarantee service pair specifically comprises the following steps: when the queue length of the transmission queue corresponding to the first type of bandwidth guarantee service is greater than L_maxWhen the first type of bandwidth guarantee service is received, the priority of a transmission queue corresponding to the first type of bandwidth guarantee service is adjusted to be P2; when the queue length of the transmission queue corresponding to the first type of bandwidth guarantee service is less than L_minAnd then, adjusting the priority of the transmission queue corresponding to the first type of bandwidth guarantee service to be P3.

L_min<L_max<And L, wherein the L is the size of a buffer area of a transmission queue corresponding to the first type of bandwidth guarantee service. L is_minAnd L_maxAnd adjusting the threshold value of the priority level of the transmission queue corresponding to the preset first type of bandwidth guarantee service.

When the queue length of the transmission queue corresponding to the first type of bandwidth guarantee service is L_maxDown to L_minAnd L_maxMeanwhile, the priority level of the transmission queue corresponding to the first type of bandwidth guarantee service is kept as P2. When the queue length of the transmission queue corresponding to the first type of bandwidth guarantee service is L_minRises to L_minAnd L_maxMeanwhile, the priority level of the transmission queue corresponding to the first type of bandwidth guarantee service is kept as P3.

Optionally, to avoid frequent adjustment of the priority level of the transmission queue corresponding to the first type of bandwidth guarantee service, L may be used_minAnd L_maxThe difference setting of (d) is larger. Illustratively, will L_minIs set to L_min50% L, mixing L_maxIs set to L_max＝80％*L。

Optionally, after the preset path is established, the method further includes: the SDN controller acquires capacity expansion or capacity reduction parameters, wherein the capacity expansion or capacity reduction parameters comprise the identification of the preset path and capacity expansion or capacity reduction bandwidth; the SDN controller inquires allocable bandwidth of all links in the DCI network; the SDN controller reestablishes the preset path and recalculates the link capacity expansion index; or the SDN controller acquires a deletion parameter, wherein the deletion parameter comprises an identifier of the preset path; and deleting the flow entries of all the switching nodes on the preset path by the SDN controller, and releasing the bandwidth resources occupied by the preset path.

Optionally, if the SDN controller obtains the capacity reduction parameter or the deletion parameter, the SDN controller sets an update identifier for the DCI network; the SDN controller periodically checks whether an update identifier is set in the DCI network; and if the updating identifier is set in the DCI network, the SDN controller reestablishes the preset paths of all the preset paths in the DCI network according to the sequence of the quality grade numerical values from large to small.

Optionally, the method for establishing the preset path in S2 is shown in fig. 3, and includes S301 to S306:

s301, the SDN controller obtains the establishing parameters of the preset path.

Wherein the establishing parameters comprise: source address set, destination address set, source access node, destination access node, QoS parameter. The establishing parameter may further include a virtual local Area Network IDentity (VLAN ID).

The source address set is a set formed by source addresses of services transmitted through the preset path. The destination address set is a set formed by destination addresses of services transmitted through the preset path. The source access node is an access node for accessing the source network to the DCI network. And the destination access node is an access node which is accessed to the DCI network by the destination network. The QoS parameters include a bandwidth of the first type of traffic demand, a latency of the first type of traffic demand, and a priority of the first type of traffic.

Illustratively, the predetermined path is established between the enterprise branch and the enterprise head office. The source address set is a network address set of an enterprise subsection; the destination address set is a network address set of an enterprise headquarters. The node of the enterprise division access DCI network is used as a source access node; and the node of the enterprise headquarters accessed the DCI network is used as a destination access node. The bandwidth requirements of the enterprise user on the network serve as QoS parameters.

S302, the SDN controller obtains a first path information set according to the establishing parameters.

The first path is a path from the source access node to the destination access node in the DCI network. The first path information set comprises the exchange node information and the link information of all the first paths. The link information includes link bandwidth information.

S303, determining at least one first shortest path from the first path information set.

Specifically, the SDN controller determines, from the first path information set, a shortest path among all paths from the source access node to the destination access node. At least one of the shortest paths. And taking the shortest path as a first shortest path.

S304, selecting a path with a path bandwidth meeting the bandwidth requirement of the first type of service requirement in the establishing parameters from the first shortest path as the preset path.

Specifically, the SDN controller compares the path bandwidth parameters of all shortest paths in the at least one shortest path with the bandwidth requirements of the first type of traffic demand, respectively. And selecting a path meeting the bandwidth requirement of the first type of service requirement in the establishing parameters as the preset path.

Optionally, when the path bandwidths of all the first shortest paths do not meet the bandwidth requirement of the first type of service requirement in the establishment parameter, the following steps are performed:

s3041, the SDN controller deletes all the ith shortest paths from the ith path information set to obtain an i +1 th path information set.

S3042, determining at least one i +1 th shortest path from the i +1 th path information set.

S3043, selecting a path, of which the currently allocable bandwidth meets the bandwidth requirement in the establishing parameter, from at least one i +1 th shortest path as the preset path.

If the bandwidth of all the i +1 th shortest paths does not meet the bandwidth requirement in the establishing parameter, adding 1 to the value of i and repeatedly executing the steps S3041 to S3043; wherein the initial value of i is 1.

After the above steps S3041 to S3043 are executed in a circulating manner, if the nth path information set is empty or the nth shortest path determined from the nth path information set cannot satisfy the QoS requirement of the first type of service, the creation of the preset path fails.

If the nth shortest path determined from the nth path information set meets the bandwidth requirement of the first type of service requirement in the establishment parameter, taking the nth shortest path as the preset path, wherein the value of N is greater than or equal to 2.

If the nth path information set is empty or the nth shortest path determined from the nth path information set cannot meet the QoS requirement of the first type of service, the creation of the preset path fails. If the nth shortest path determined from the nth path information set meets the bandwidth requirement of the first type of service requirement in the establishing parameters; the nth shortest path is taken as the preset path.

Optionally, in this embodiment of the application, if the nth shortest path is taken as the preset path, the quality level of the preset path is set to N; the quality grade reflects the service quality level of the preset path, and the larger the quality grade value is, the worse the service quality of the preset path is.

S305, the SDN controller generates the first flow table corresponding to the preset path.

S306, the SDN controller issues the first flow entry to each switching node included in the preset path.

Optionally, in the above S304, when none of the N-th shortest paths in the N-th path information set meets the bandwidth requirement of the first type of service requirement in the establishment parameter; the application also provides a method for calculating the link capacity expansion index, which comprises the following steps:

o’(e,N)＝γ^N-1*B-B_avail(e))。

wherein, the link e is a link with the current available bandwidth smaller than the bandwidth requirement of the preset path in the Nth shortest path, and o' (e, N) represents the expansion index increment of the preset path to the link e when the Nth path is established; (ii) a Gamma is a link capacity expansion index adjusting parameter; b is the bandwidth required by the first type of service; b is_avail(e) The current allocable bandwidth of the link; .

In the process of establishing the preset path, the o' (e, N) calculated according to the formula is superposed to obtain the expansion index increment of the preset path to the link e.

And accumulating the expansion index increment of the link e by all the current preset paths of the network to obtain the expansion index of the link e. And carrying out capacity expansion on the link in the network according to the link capacity expansion index.

In the service transmission method provided by the application, the switching node determines the service type of a service to be transmitted; if the service type is a first type, transmitting the service to be transmitted through a first flow table item; if the service type is a second type, transmitting the service to be transmitted through a second flow table item; and after the transmission path of the service is determined, switching the service types of the first type and the second type and the QoS requirements and a service transmission queue at a source access node, so that the service to be transmitted is transmitted according to the preset priority. And the SDN controller establishes the preset path for the first type of service in advance and calculates the routing path for the second type of service to be transmitted. Therefore, the service transmission method provided by the application can avoid the rapid increase of network time delay and packet loss when services with high priority in the DCI network converge, reduce the pressure on the SDN controller, improve the bandwidth utilization rate and reduce the network construction cost.

As shown in fig. 5, an embodiment of the present application provides a device for service transmission, where the device is applied to a switching node, and is configured to perform the foregoing method for service transmission, where the device includes:

a processing module 501, configured to determine a service type of a service to be transmitted; and the service type is obtained by classifying the service in advance according to the user.

If the service type is a first type, forwarding the service to be transmitted according to a first flow table item; the first flow entry is generated by the SDN controller according to a preset path, where the preset path includes the switching node, and the preset path is a transmission path that is established in advance and used for transmitting the first type of service.

If the service type is a second type, forwarding the service to be transmitted according to a second flow table item; wherein the second flow entry is generated by the SDN controller according to a routing path; the routing path includes the switching node, and the routing path is a transmission path calculated by the SDN controller according to a preset algorithm.

Optionally, with reference to fig. 5, as shown in fig. 6, the apparatus provided in the embodiment of the present application may further include a sending module 601.

The processing module 501 is further configured to determine a service type and a QoS requirement of a service to be transmitted; and determining a transmission queue for transmitting the service to be transmitted according to the service type and the QoS requirement. A sending module 601, configured to forward the service to be transmitted according to the priority of the transmission queue.

Optionally, the processing module 501 is further configured to set a priority level of the transmission queue corresponding to the first type of delay-sensitive service to be P1; and setting two different priority levels P2 and P3 for the transmission queue corresponding to the first type of bandwidth guarantee service. Setting the priority level of the transmission queue corresponding to the second type of delay sensitive service as P4; setting the priority level of the transmission queue corresponding to the first type and the second type of the ordinary traffic as P5. The priority levels are arranged in the order from high to low: p1> P2> P4> P3> P5.

Optionally, the processing module 501 is further configured to determine that the queue length of the transmission queue corresponding to the first type of bandwidth-sensitive service exceeds L_maxWhen the first type of bandwidth-sensitive service is available, the priority level of the transmission queue corresponding to the first type of bandwidth-sensitive service is adjusted to be P2; when the queue length of the transmission queue corresponding to the first type of bandwidth sensitive service is less than L_minThen, the priority level of the transmission queue corresponding to the first type of bandwidth-sensitive service is adjusted to P3.

When the queue length of the transmission queue corresponding to the first type of bandwidth sensitive service is L_maxDown to L_minAnd L_maxIn the meantime, the priority level of the transmission queue corresponding to the first type of bandwidth-sensitive service is kept as P2; when the queue length of the transmission queue corresponding to the first type of bandwidth sensitive service is L_minRises to L_minAnd L_maxIn between, the priority level of the transmission queue corresponding to the first type of bandwidth-sensitive traffic is kept as P3.

Wherein L is_min<L_max<And L, wherein the L is the size of a buffer area of a transmission queue corresponding to the first type of bandwidth sensitive service.

As shown in fig. 7, another service delivery apparatus provided in this embodiment of the present application is applied to an SDN controller, and is configured to perform the foregoing service delivery method, where the apparatus includes:

an obtaining module 701 is configured to obtain an establishment parameter of a preset path. The preset path is a transmission path which meets the QoS requirement of the first type of service; the preset path includes at least one switching node.

The establishing parameters comprise: a source address set, a destination address set, a source access node, a destination access node and QoS parameters; the source address set is a set formed by source addresses of services transmitted through the preset path; the destination address set is a set formed by destination addresses of services transmitted through the preset path; the source access node is an access node for accessing a source network to the DCI network; the destination access node is an access node for accessing the destination network to the DCI network; the QoS parameters include a bandwidth of the first type of traffic demand, a latency of the first type of traffic demand, and a priority of the first type of traffic.

A processing module 702, configured to determine the preset path matched with the establishment parameter according to the allocable bandwidths of all links in the DCI network. The processing module is further configured to generate a first flow entry corresponding to the preset path.

A sending module 703, configured to send the first flow entry to each switching node included in the preset path.

Optionally, the processing module 702 is further configured to obtain a first path information set according to the establishment parameter; the first path is a path from the source access node to the destination access node in the DCI network; the first path information set comprises the exchange node information and the link information of all the first paths.

Optionally, the processing module 702 is further configured to determine at least one first shortest path from the first path information set.

Optionally, the processing module 702 is further configured to select, as the preset path, a path whose path bandwidth meets the bandwidth requirement of the first type of service requirement in the establishment parameter from at least one of the first shortest paths.

Optionally, the processing module 702 is further configured to, when the path bandwidths of all the first shortest paths do not meet the bandwidth requirement of the first type of traffic demand in the establishment parameter, execute the following steps:

And if the Nth path information set is empty or the Nth shortest path determined from the Nth path information set cannot meet the QoS requirement of the first type of service, the preset path is failed to be established.

The processing module 702 is further configured to set the quality level of the preset path to N; the quality grade reflects the service quality level of the preset path, and the larger the quality grade value is, the worse the service quality of the preset path is.

Optionally, the processing module is further configured to determine that the N-th shortest path in the N-th path information set does not meet the bandwidth requirement of the first type of service requirement in the establishment parameter; and executing the following steps on the Nth shortest path:

counting each link in the N shortest path, wherein the current allocable bandwidth is smaller than the first type of service requirement; calculating the difference value between the current allocable bandwidth of each link and the bandwidth of the first type of service requirement; calculating a product of the difference and a path adjustment parameter; the path adjusting parameter is a variable and is used for adjusting the weight of the difference value in a link capacity expansion index; accumulating all the products of the links in the process of establishing the preset path to obtain the capacity expansion index increment of the preset path to the links; accumulating the increment of the expansion indexes of the links by all the current preset paths of the SDN network to obtain the expansion indexes of the links; and carrying out capacity expansion on the link in the network according to the link capacity expansion index when the network operation and maintenance or the preset path is failed to establish.

Fig. 8 shows a schematic diagram of another possible structure of the traffic transmission apparatus applied to the switching node in the above embodiment. The device includes: a processor 802 and a communications interface 803. The processor 802 is used to control and manage the actions of the device, e.g., to perform the steps performed by the processing module 501 described above, and/or other processes for performing the techniques described herein. The communication interface 803 is used to support the communication of the apparatus with other network entities, for example, to perform the steps performed by the sending module 601. The terminal may further comprise a memory 801 and a bus 804, the memory 801 being used for storing program codes and data of the device.

The processor 802 may implement or execute various illustrative logical blocks, units, and circuits described in connection with the disclosure herein. The processor may be a central processing unit, general purpose processor, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, units, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others.

Memory 801 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as read-only memory, flash memory, a hard disk, or a solid state disk; the memory may also comprise a combination of memories of the kind described above.

The bus 804 may be an Extended Industry Standard Architecture (EISA) bus or the like. The bus 804 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.

Fig. 9 shows another possible structure diagram of the service transmission apparatus applied to the SDN controller in the above embodiment. The device includes: a processor 902 and a communication interface 903. The processor 902 is used to control and manage the actions of the device, e.g., to perform the steps performed by the processing module 702 described above, and/or other processes for performing the techniques described herein. The communication interface 903 is used for supporting communication between the apparatus and other network entities, for example, the steps performed by the obtaining module 701 and the sending module 703 are performed. The apparatus may further comprise a memory 901 and a bus 904, the memory 901 being used for storing program codes and data of the apparatus.

The processor 902 described above may implement or execute various exemplary logical blocks, units and circuits described in connection with the present disclosure. The processor may be a central processing unit, general purpose processor, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, units, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others.

Memory 901 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as read-only memory, flash memory, a hard disk, or a solid state disk; the memory may also comprise a combination of memories of the kind described above.

The bus 904 may be an Extended Industry Standard Architecture (EISA) bus or the like. The bus 904 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 9, but this does not indicate only one bus or one type of bus.

It is clear to those skilled in the art from the foregoing description of the embodiments that, for convenience and simplicity of description, the foregoing division of the functional units is merely used as an example, and in practical applications, the above function distribution may be performed by different functional units according to needs, that is, the internal structure of the device may be divided into different functional units to perform all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.

Embodiments of the present application further provide a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by a computer, the computer performs each step executed by an SDN controller or a switching node in a method flow shown in the foregoing method embodiments.

The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, and a hard disk. Random Access Memory (RAM), Read-Only Memory (ROM), erasable programmable Read-Only Memory (EPROM), registers, a hard disk, optical fiber, portable Compact disk Read-Only Memory (CD-ROM), optical storage devices, magnetic storage devices, or any other form of computer-readable storage medium, in any suitable combination, or as appropriate in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuit (ASIC). In embodiments of the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application.

Claims

1. A method for service transmission is applied to a Software Defined Network (SDN) network for realizing network interconnection, wherein the SDN network comprises: an SDN controller and at least one switching node; the method comprises the following steps:

the switching node determines the service type of the service to be transmitted; the service type is obtained by classifying services in advance according to users;

if the service type is a first type, forwarding the service to be transmitted according to a first flow table item; the first flow table entry is generated by the SDN controller according to a preset path, where the preset path includes the switching node, and the preset path is a pre-established dedicated transmission path for transmitting the first type of service;

if the service type is a second type, forwarding the service to be transmitted according to a second flow table item; wherein the second flow entry is generated by the SDN controller according to a routing path; the routing path comprises the switching node, and the routing path is a transmission path calculated by the SDN controller according to a preset algorithm;

the first type of traffic transmission requirements are higher than the second type of traffic transmission requirements.

2. The method for traffic transmission according to claim 1, wherein the method further comprises:

the switching node determines the service type and the QoS (quality of service) requirement of the service to be transmitted;

the switching node determines a transmission queue for transmitting the service to be transmitted according to the service type and the QoS requirement;

and the switching node forwards the service to be transmitted according to the priority of the transmission queue.

3. The method of service transmission according to claim 2, wherein the first type of service includes a delay sensitive service, a bandwidth guarantee service, and a normal service; the second type of service comprises a time delay sensitive service and a common service;

wherein the priority level of the transmission queue corresponding to the first type of delay-sensitive service is P1; the transmission queue corresponding to the first type of bandwidth guarantee service has two different priority levels P2 and P3;

the priority level of the transmission queue corresponding to the second type of delay sensitive service is P4; the priority levels of the transmission queues corresponding to the first type and the second type of common services are P5;

the priority levels are arranged in the order from high to low: p1> P2> P4> P3> P5.

4. The method of claim 3, wherein the transmission queue corresponding to the first type of bandwidth guarantee service has two different priority levels P2 and P3, and comprises:

when the queue length of the transmission queue corresponding to the first type of bandwidth sensitive service exceeds L_maxWhen the first type of bandwidth-sensitive service is available, the priority level of the transmission queue corresponding to the first type of bandwidth-sensitive service is adjusted to be P2;

when the queue length of the transmission queue corresponding to the first type of bandwidth sensitive service is less than L_minWhen the first type of bandwidth-sensitive service is available, the priority level of the transmission queue corresponding to the first type of bandwidth-sensitive service is adjusted to be P3;

when the queue length of the transmission queue corresponding to the first type of bandwidth sensitive service is L_maxDown to L_minAnd L_maxWhen the first type of bandwidth-sensitive service is started, maintaining the priority level of the transmission queue corresponding to the first type of bandwidth-sensitive serviceIs P2;

when the queue length of the transmission queue corresponding to the first type of bandwidth sensitive service is L_minRises to L_minAnd L_maxIn the meantime, the priority level of the transmission queue corresponding to the first type of bandwidth-sensitive service is kept as P3;

5. A method for service transmission is applied to an SDN network for realizing network interconnection, wherein the SDN network comprises: a software defined network, SDN, controller and at least one switching node; the method comprises the following steps:

the SDN controller acquires the establishment parameters of a preset path; the preset path is a pre-established special transmission path for transmitting the first type of service; the preset path comprises at least one switching node; the establishing parameters comprise: a source address set, a destination address set, a source access node, a destination access node and a quality of service (QoS) parameter; the source address set is a set formed by source addresses of services transmitted through the preset path; the destination address set is a set formed by destination addresses of services transmitted through the preset path; the source access node is an access node for accessing a source network to the SDN network; the destination access node is an access node for accessing a destination network to the SDN network; the QoS parameters comprise the bandwidth of the first type of service requirement, the time delay of the first type of service requirement and the priority of the first type of service;

the SDN controller determines the preset path matched with the establishing parameters according to the allocable bandwidth of all links in the SDN network;

the SDN controller generates a first flow table item corresponding to the preset path;

the SDN controller issues the first flow table item to each switching node contained in the preset path;

the first type of service is a service with higher requirement on network transmission QoS.

6. The service transmission method according to claim 5, wherein the determining, by the SDN controller, the preset path matching the establishment parameter according to the allocable bandwidth of all links in the SDN network comprises:

the SDN controller acquires a first path information set according to the establishing parameters; the first path is a path from the source access node to the destination access node in the SDN network; the first path information set comprises exchange node information and link information of all the first paths;

determining at least one first shortest path from the first set of path information;

and selecting a path with a path bandwidth meeting the bandwidth requirement of the first type of service requirement in the establishing parameters from the at least one first shortest path as the preset path.

7. The method for traffic transmission according to claim 6, wherein the method further comprises:

when the path bandwidths of all the first shortest paths do not meet the bandwidth requirement of the first type of service requirement in the establishing parameters, executing the following steps:

s1, the SDN controller deletes all the ith shortest paths from the ith path information set to obtain an (i + 1) th path information set;

s2, determining at least one i +1 th shortest path from the i +1 th path information set;

s3, selecting a path with the current assignable bandwidth meeting the bandwidth requirement in the establishing parameters from at least one i +1 th shortest path as the preset path;

if the bandwidth of all the i +1 th shortest paths does not meet the bandwidth requirement in the establishing parameter, adding 1 to the value of i and repeatedly executing the steps S1 to S3; wherein the initial value of i is 1;

if the nth path information set is empty or the nth shortest path determined from the nth path information set cannot meet the QoS requirement of the first type of service, the preset path creation fails;

8. The method for traffic transmission according to claim 7, wherein the method further comprises:

when the nth shortest path in the nth path information set does not meet the bandwidth requirement of the first type of service requirement in the establishment parameter, performing the following steps on the nth shortest path:

counting each link in the N shortest path, wherein the current allocable bandwidth is smaller than the first type of service requirement;

calculating the difference value between the current allocable bandwidth of each link and the bandwidth of the first type of service requirement;

calculating a product of the difference and a path adjustment parameter; the path adjusting parameter is a variable and is used for adjusting the weight of the difference value in a link capacity expansion index;

accumulating all the products of the links in the process of establishing the preset path to obtain the capacity expansion index increment of the preset path to the links; accumulating the increment of the expansion indexes of the links of all the preset paths of the SDN network to obtain the expansion indexes of the links; the link capacity expansion index is used for indicating the size and priority of capacity expansion bandwidth when a link in the network is subjected to capacity expansion;

and carrying out capacity expansion on the link in the network according to the link capacity expansion index.

9. An apparatus for service transmission, applied in an SDN network implementing network interconnection, the SDN network comprising: a software defined network, SDN, controller and at least one switching node; the device comprises:

the processing module is used for determining the service type of the service to be transmitted; the service type is obtained by classifying services in advance according to users;

10. The apparatus for traffic transmission according to claim 9, wherein the apparatus further comprises a sending module, wherein:

the processing module is also used for determining the service type and the QoS requirement of the service to be transmitted; determining a transmission queue for transmitting the service to be transmitted according to the service type and the QoS requirement;

and the sending module is used for forwarding the service to be transmitted according to the priority of the transmission queue.

11. The apparatus for service transmission according to claim 10, wherein the first type of service includes a delay sensitive service, a bandwidth guarantee service, and a normal service; the second type of service comprises a time delay sensitive service and a common service;

the processing module is further configured to set a priority level of the transmission queue corresponding to the first type of delay-sensitive service to P1; setting two different priority levels P2 and P3 for the transmission queue corresponding to the first type of bandwidth guarantee service;

setting the priority level of the transmission queue corresponding to the second type of delay sensitive service as P4; setting the priority level of the transmission queue corresponding to the first type and the second type of common services as P5;

12. Traffic transmission apparatus according to claim 11,

the processing module is further configured to:

when the queue length of the transmission queue corresponding to the first type of bandwidth sensitive service is L_maxDown to L_minAnd L_maxIn the meantime, the priority level of the transmission queue corresponding to the first type of bandwidth-sensitive service is kept as P2;

13. An apparatus for service transmission, applied in an SDN network implementing network interconnection, the SDN network comprising: a software defined network, SDN, controller and at least one switching node; the device comprises:

the acquisition module is used for acquiring the establishment parameters of the preset path;

the preset path is a special transmission path which meets the QoS requirement of the first type of service; the preset path comprises at least one switching node;

the establishing parameters comprise: a source address set, a destination address set, a source access node, a destination access node and QoS parameters; the source address set is a set formed by source addresses of services transmitted through the preset path; the destination address set is a set formed by destination addresses of services transmitted through the preset path; the source access node is an access node for accessing a source network to the SDN network; the destination access node is an access node for accessing a destination network to the SDN network; the QoS parameters comprise the bandwidth of the first type of service requirement, the time delay of the first type of service requirement and the priority of the first type of service;

the processing module is used for determining the preset path matched with the establishing parameters according to the allocable bandwidth of all links in the SDN network; generating a first flow table item corresponding to the preset path;

a sending module, configured to send the first flow entry to each switching node included in the preset path;

14. The traffic transmitting apparatus of claim 13, wherein the processing module is further configured to:

acquiring a first path information set according to the establishing parameters; the first path is a path from the source access node to the destination access node in the SDN network; the first path information set comprises exchange node information and link information of all the first paths;

and selecting a path with a path bandwidth meeting the bandwidth requirement of the first type of service requirement in the establishing parameters from at least one first shortest path as the preset path.

15. The apparatus for traffic transmission according to claim 14, wherein the processing module is further configured to:

16. The traffic transmitting apparatus of claim 15, wherein the processing module is further configured to:

when the N shortest path in the N path information set does not meet the bandwidth requirement of the first type of service requirement in the establishing parameter; and executing the following steps on the Nth shortest path:

accumulating all the products of the links in the process of establishing the preset path to obtain the capacity expansion index increment of the preset path to the links; accumulating the increment of the expansion indexes of the links by all the current preset paths of the SDN network to obtain the expansion indexes of the links;