CN114363196A

CN114363196A - Network service quality guarantee method for active application perception

Info

Publication number: CN114363196A
Application number: CN202210051077.6A
Authority: CN
Inventors: 原玉磊; 陈曙晖; 赵宝康; 王飞; 赵锋; 魏子令
Original assignee: National University of Defense Technology
Current assignee: National University of Defense Technology
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-04-15
Anticipated expiration: 2042-01-17
Also published as: CN114363196B

Abstract

The invention discloses a network service quality guarantee method for active application perception, which adopts the technical scheme that an active application perception network service quality guarantee system consisting of a configuration file, an initialization module, an application perception module, a service quality perception module, a path optimization module and a transmission control module is constructed; the application sensing module, the service quality sensing module, the path optimization module and the transmission control module work in parallel, the application sensing module realizes application sensing of network messages, the service quality sensing module realizes service quality sensing of network flows, the path optimization module calculates and optimizes a network flow transmission path according to network flow service quality sensing data and network measurement data, and the transmission control module utilizes network flow transmission path data to package messages into network service quality guarantee messages to realize network service quality guarantee of application. The invention realizes the guarantee of the network service quality of the application under the conditions of no application sense and no network sense.

Description

Network service quality guarantee method for active application perception

Technical Field

The invention belongs to the technical field of computer networks, and particularly relates to a network service quality guarantee method for active application perception.

Background

With the development of technologies such as cloud computing and mobile internet, the internet scale is gradually enlarged, and the types and the number of applications on the internet are explosively increased. Different types of applications have different requirements on underlying network transmission in terms of bandwidth, time delay, jitter, and the like. The current internet architecture is designed hierarchically, and the underlying network cannot sense the transmission requirement Of the upper application, so that it is difficult to provide corresponding Quality Of Service (QoS) guarantee for the application.

In order to ensure that the network can provide service quality guarantee for the application, the network needs to be capable of simultaneously sensing the application type and the application service quality, accurately implementing flow engineering in real time and controlling the application flow to be transmitted according to the requirement.

The existing part aims at research of application perception, and service requirements of applications and network service quality guarantee are not combined. For example, the application perception system and the method thereof based on software definition and a user center network in the western Ann transportation university, aiming at the application perception problem in the 5G mobile communication network, a layered application perception method is provided based on the software definition and the user center network, and the application perception of each user can be realized, but no further research is carried out on the use of the application perception result. According to the bandwidth allocation method and system for ensuring business fairness based on application perception, aiming at the problem of bandwidth allocation of an optical network, Chinese patent, grant publication No. CN 108881067B, 11.6.2020, bandwidth of an optical network unit is calculated and allocated according to the satisfaction degree of a user to terminal business and the load state of the optical network unit and according to a utility function and the maximum and minimum principle of utility, and fairness of bandwidth allocation is realized. The application perception in the invention is mainly the perception of the service satisfaction degree of the user terminal and is not the perception of specific application types, and the bandwidth allocation is based on a designed utility function rather than the actual service quality requirement of the application.

At present, research on combination of application requirements and network service quality is mainly an application-aware network APN6 based on IPv6, but an APN6 requires an application to encapsulate network service requirements in a network message, belongs to application initiative and network passivity, has high application requirements in implementation, and cannot be compatible with existing applications. For example, an application-aware network framework-APN 6 based on IPv6 is provided by an application-aware network (APN6) [ J ].2021(2020-8):36-42.) based on 'IPv 6 +' (see He Ling, Hegechi, Wangcheng, etc.), and the requirement information of the application is encapsulated in a data packet, so that the network can sense the application and the requirement thereof, and the network can conveniently carry out traffic scheduling and resource adjustment. Huashi technology corporation Li & ltd. (see C.Li, J.Mao, S.Peng, Y.Xia, Z.Hu and Z.Li, "Application-aware G-SRv6 network interfacing 5G services," (Application-aware G-SRv6 network-enabled 5G services) IEEE INFOCOM 2021-IEEE Conference on Computer Communications workstations (INFOCOM WKSHPS),2021, pp.1-2, doi:10.1109/INFOCOMWKSHPS51825.2021.9484608.) proposed an Application-aware network supporting 5G services based on G-SRv6 technology, but this scheme also requires applications to encapsulate requirement information into network messages, and faces incompatibility problems with existing applications.

Some studies have implemented traffic engineering using SDN technology. For example, in the scenario of internet of things, such as wang Jingyu of Beijing post and telecommunications university (see Wang Jingyu, Wangjingjingchen, Qiqi, Sunjian, Xujun.) and the like (China patent, grant publication No. CN 108881028B, 26/6/2020) which realize application awareness based on deep learning, application identification of traffic is realized in an SDN network architecture by a deep learning method, and network resource scheduling is realized by an SDN controller according to an identification result. The invention realizes network resource scheduling from application awareness, but because the network resource scheduling is realized through the SDN technology, an SDN controller needs to frequently interact with switching equipment to issue a routing forwarding table, and the real-time performance and the reliability of the network are influenced.

The above research either does not combine application awareness with application service quality assurance, or requires an application to insert a network service requirement into a network packet, which has a high requirement on the application, or has a certain influence on network operation when traffic engineering is implemented. How to realize the network service quality guarantee for the application under the conditions of no application sense and no network sense is a great concern for those skilled in the art.

Disclosure of Invention

The invention aims to solve the technical problem of how to realize the guarantee of the network service quality of the application under the conditions of no application sense and no network sense.

The technical scheme is as follows: the method comprises the steps of realizing active perception of application types and application service quality based on the existing application identification technology, calculating a path meeting application service quality requirements in a network by utilizing network measurement data, controlling network flow of applications to be transmitted according to the calculated path based on SRv6 technology, and realizing network service quality guarantee of the applications.

The invention specifically comprises the following steps:

firstly, constructing an active application perception network service quality guarantee system:

the active application perception network service quality guarantee system is composed of a configuration file, an initialization module, an application perception module, a service quality perception module, a path optimization module and a transmission control module.

The configuration file stores parameters required by the operation of the active application perception network service quality guarantee system, and the parameters comprise network application transmission failure time T (T is a positive integer and the unit is second), the number N (N is a positive integer and is not less than 3) of forwarding nodes in a network (namely nodes for forwarding messages in the network), the numbers and IP addresses of the N network forwarding nodes, the number AN of network applications, and the name and service quality requirements of each network application.

The initialization module is connected with the configuration file, the application sensing module, the service quality sensing module, the path optimization module and the transmission control module. The method comprises the steps that an initialization module reads the number N of forwarding nodes in a network and the transmission failure time T of network application from a configuration file, the numbers and IP addresses of the N network forwarding nodes are respectively read from the configuration file according to the sequence, the IP addresses of the network forwarding nodes are stored into an IP address array IP _ array, the IP _ array has N elements in total, each element has two fields, one field is the number (namely device _ id) of the network forwarding node, and the other field is the IP address (namely device _ IP) of the network forwarding node with the corresponding number; the number AN of the network applications is read from the configuration file, the names and the service quality requirements of the AN network applications are respectively read from the configuration file according to the sequence, the names and the service quality requirements of the network applications are stored into a service quality data array app _ sla _ array, app _ sla _ array has AN elements, each element has two domains, one domain is the name of the network application (namely app _ name), and the other domain is the service quality requirement of the network application with the corresponding name (namely app _ band). The initialization module sends AN and app _ sla _ array to the QoS sensing module, sends N and ip _ array to the path optimization module, and sends T to the application sensing module and the transmission control module.

The application aware module is connected to the initialization module and the qos aware module, and is connected to an external network through a network splitter (a network device for replicating network traffic). The application sensing module internally maintains an application identification result linked list appid _ list, each element in the linked list is application identification result data appid _ str, and appid _ str comprises 7 fields: the name of the network application (i.e. app _ name), the arrival time of the latest message (i.e. app _ time) where the network application is streamed, the source IP (i.e. app _ sip) where the network application is streamed, the destination IP (i.e. app _ dip) where the network application is streamed, the source port (i.e. app _ port) where the network application is streamed, the destination port (i.e. app _ dport) where the network application is streamed, and the protocol number (i.e. app _ proto) where the network application is streamed. The application sensing module receives a network message of an external network through the network shunt, identifies a network application name to which the network message belongs through an application identification method, constructs application identification result data appid _ str, sends the application identification result data appid _ str to the service quality sensing module, and meanwhile adds the application identification result data appid _ str into an application identification result linked list. And receiving the network application transmission failure time T from the initialization module, and judging whether the network application transmission is failed or not.

The service quality perception module is connected with the initialization module, the application perception module and the path optimization module. The service quality perception module receives the number AN of the network applications and the service quality data array app _ sla _ array from the initialization module, and receives application identification result data appid _ str from the application perception module. Constructing network flow service quality data flow _ sla _ str according to app _ sla _ array and appid _ str, wherein the flow _ sla _ str comprises 6 fields: the source IP of the network flow (i.e., flow _ sip), the destination IP of the network flow (i.e., flow _ dip), the source port of the network flow (i.e., flow _ port), the destination port of the network flow (i.e., flow _ dport), the protocol number of the network flow (i.e., flow _ proto), and the quality of service requirement of the network flow (i.e., flow _ band). Flow _ sla _ str is sent to the path optimization module.

The path optimization module is connected with the initialization module, the service quality perception module, the transmission control module and an external network measurement system (generally realized by adopting active detection technologies such as INT and SNMP protocols). The path optimization module receives the number N of network forwarding nodes and the IP address array IP _ array of the nodes from the initialization module, receives the flow _ sla _ str of the service quality sensing data from the service quality sensing module, and receives the network measurement data from the external network measurement system, wherein the network measurement data consists of a network bandwidth data array link _ band _ array and the number BN of bandwidth data. There are BN elements in the link _ band _ array, each element storing one bandwidth data. Each bandwidth data includes 3 fields: the number of the start node of the network link where the data is located is start _ id, the number of the end node of the network link where the data is located is end _ id, and the bandwidth band of the network link where the data is located. The path optimization module calculates network topology data according to the network measurement data, wherein the network topology data are composed of an adjacency list array topo _ array, N elements are arranged in the topo _ array in total, and each element stores one adjacency list data. Adjacency list data includes 3 fields: the adjacency list represents the number nid of the network forwarding node, the number an of the network forwarding nodes directly connected with the network forwarding node with the number nid, and the number array id _ array of the network forwarding nodes directly connected with the network forwarding node with the number nid (each element in id _ array stores the number of one network forwarding node directly connected with the network forwarding node with the number nid, and has an element in total, and an is a positive integer). And the path optimization module calculates all paths between the node where the source IP is located and the node where the destination IP is located in the service quality perception data according to the network topology data, selects a path meeting the service quality requirement, and constructs network application transmission path data app _ path _ str. app _ path _ str stores path information of a network application being transmitted, and comprises 7 fields: the time when the network application recently transmits the packet (i.e. app _ t), the source IP of the network application (i.e. sip), the destination IP of the network application (i.e. dip), the source port of the network application (i.e. sport), the destination port of the network application (i.e. dport), the number of nodes in the transmission path of the network application (i.e. nn), and the IP array of the transmission path nodes of the network application (i.e. pathip _ array). The path optimization module sends app _ path _ str to the transmission control module.

The transmission control module is connected with the initialization module, the path optimization module and the external network. The transmission control module receives T from the initialization module, and internally maintains a network application transmission path linked list app _ path _ list, wherein each element in the app _ path _ list stores transmission path data of one network application. The network application transmission path data structure is app _ path _ str. The transmission control module receives the network application transmission path data app _ path _ str from the path optimization module and stores the data app _ path _ str into app _ path _ list. The transmission control module receives the network message pkt from the external network, and searches the network application to which the network flow of the pkt belongs from the app _ path _ list according to the source IP, the destination IP, the source port, the destination port and the protocol number of the pkt. If the corresponding network application is found in the app _ path _ list, the transmission control module uses the network application transmission path data to package pkt into a service quality guarantee message pkt _ sla, and sends pkt _ sla to an external network; and if the corresponding network application is not found, the transmission control module directly sends the pkt to an external network.

Secondly, initializing a configuration file, wherein the method comprises the following steps:

determining the transmission failure time T (T is in seconds, T >0, and T is preferably 90 seconds) of the network application, and writing the T into a configuration file; according to the network topology of the application network, the number N of forwarding nodes in the network is counted, and the N is written into a configuration file; respectively writing the serial numbers and the corresponding IP addresses of the N network devices into a configuration file according to the IP address of each network device in the application network and the serial number in the network topology corresponding to each network device; according to the number AN (AN is more than or equal to 1) of the network applications in the application network, and the name and the service quality requirement of each network application, the names and the service quality requirements of the AN and the AN network applications are sequentially written into a configuration file.

Thirdly, the initialization module initializes the active application perception network service quality guarantee system, and the method is as follows:

3.1 reads T, N from the configuration file, the number and IP address of the N network devices in order.

3.2 initialize IP _ array, that is, store the numbers and IP addresses of N network devices into N elements of IP _ array.

3.3 reading AN from the configuration file, and reading the names and service quality requirements of AN network applications in sequence.

3.4 initialize app _ sla _ array, i.e. store the name and quality of service requirement of AN network applications in AN element of app _ sla _ array.

3.5 sending the T to an application sensing module and a transmission control module; sending the N and the ip _ array to a path optimization module; AN and app _ sla _ array are sent to the quality of service aware module.

Fourthly, an application sensing module, a service quality sensing module, a path optimization module and a transmission control module of the active application sensing network service quality guarantee system are matched and work in parallel to realize the active application sensing network service quality guarantee,

the method comprises the following steps: the application perception module realizes the application perception of the network message according to the flow of 4.1: receiving network application transmission failure time from an initialization module, receiving a network message of an external network through a network shunt, judging whether a network flow where the network message is located has an identification result according to data such as a source IP, a destination IP, a source port, a destination port, a protocol number and the like of the network message and an application identification result linked list, discarding the network message if the network flow where the network message is located has the identification result, identifying the name of the network application where the network flow where the network message is located if the network flow where the network message is located does not have the identification result, constructing network application identification result data according to the identification result, adding the network application identification result data into the application identification result linked list, sending the application identification result linked list to a service quality sensing module, judging whether an element in the application identification result linked list is failed according to the network application transmission failure time, and deleting the failed element; meanwhile, the service quality perception module realizes the service quality perception of the network flow according to the flow of 4.2: receiving the number of the network applications, the name of each network application and the service quality requirement from the initialization module, receiving a network application identification result from the application sensing module, constructing network flow service quality data, and sending the network flow service quality data to the path optimization module; meanwhile, the path optimization module calculates and optimizes the network flow transmission path according to the flow of 4.3 and the service quality perception data and the network measurement data of the network flow: receiving network application transmission failure time from an initialization module, receiving network stream service quality data from a service quality perception module, monitoring a network measurement system and receiving network measurement data from the network measurement system, calculating network topology data of a current external network according to the network measurement data, calculating all possible paths of a network stream where each network application is located according to the real-time network topology data, calculating paths meeting network stream service quality requirements according to the network stream service quality data, constructing network application transmission path data, and sending the network application transmission path data to a transmission control module; meanwhile, the transmission control module calculates and optimizes a network flow transmission path according to the network flow service quality perception data and the network measurement data according to the flow of 4.4, so that the network service quality guarantee of the application is realized: the method comprises the steps of receiving network application transmission failure time from an initialization module, receiving network application transmission path data from a path optimization module, updating a network application transmission path chain table according to the network application transmission path data, receiving network messages from an external network, searching a transmission path of network application corresponding to network flow from the network application transmission path chain table according to source IP, target IP, source ports, target ports, protocol numbers and the like of the network messages, packaging the network messages into service quality guarantee messages according to IP addresses of network equipment in the transmission path if the transmission path is found, sending the service quality guarantee messages to the external network, and directly sending the network messages to the external network without network service quality guarantee if the transmission path is not found.

4.1 the application perception module realizes the application perception of the network message according to the method of 4.1.1-4.1.8:

4.1.1 the application sensing module receives the network application transmission failure time T from the initialization module, and the initialization application identification result linked list appid _ list is empty.

4.1.2 monitoring the network shunt by the application sensing module, if a network message arrives, turning to the step 4.1.3, otherwise turning to the step 4.1.2 to continue monitoring.

4.1.3 receiving the network message, obtaining the source IP address sip1, the destination IP address dip1, the source port sport1, the destination port dport1, the protocol number proto1 of the network message, and obtaining the current system time ct.

4.1.4 find elements from appid _ list that simultaneously satisfy the following condition:

domain app _ sip — sip 1;

domain app _ dip ═ dip 1;

domain app _ sport ═ sport 1;

domain app _ dport — dport 1;

domain app _ proto — proto 1;

if not found, go to step 4.1.5, if found, assume that the found element is app1, go to step 4.1.8.

4.1.5 use network message as detection sample, use multi-layer classifier method (for concrete implementation, refer to Zhao Shuang, Chenghui, Suyi article, Wang Fei, Sujin Tree. the mobile application traffic identification method based on multi-layer classifier (fifth step): Chinese patent, grant publication No. CN 109151880B) identifies the network application (input is network message, output is name or identification failure identifier of network application of network flow where network message belongs) to which the network message belongs, if identification succeeds, assume that the identified network application name is name1, go to step 4.1.6, if identification fails, discard network message, go to step 4.1.2.

4.1.6 constructing application identification result data appid _ str, and ordering:

appid_str.app_name＝name1；

appid_str.app_time＝ct；

appid_str.app_sip＝sip1；

appid_str.app_dip＝dip1；

appid_str.app_sport＝sport1；

appid_str.app_dport＝dport1；

appid_str.app_proto＝proto1；

4.1.7 adding the appid _ str into the appid _ list and sending the appid _ str to the service quality perception module. Go to step 4.1.2.

4.1.8, judging whether ct-app1.app _ time > T is true, if true, indicating that app1 is overtime, deleting app1 from appid _ list, and turning to step 4.1.5; if the current time of the network application is not up, updating the arrival time of the latest message of the current of the network application, namely enabling app1.app _ time to be ct, discarding the network message, and turning to the step 4.1.2.

4.2 the service quality perception module realizes the service quality perception of the network flow according to the method of 4.2.1-4.2.6:

4.2.1 quality of service aware module receives AN and app _ sla _ array from the initialization module.

4.2.2 the QoS sensing module monitors the application sensing module, if there is an appid _ str coming, go to step 4.2.3, otherwise go to step 4.2.2 to continue monitoring.

4.2.3 the quality of service aware module receives the appid _ str from the application aware module.

4.2.4 the quality of service aware module looks up the element with the same value of domain app _ name as app _ str. app _ name from app _ sla _ array, if found, assume that the found element is app _ sla _ array [ id ], go to step 4.2.5, otherwise go to step 4.2.2.

4.2.5 construct network flow quality of service data flow _ sla _ str with:

flow_sla_str.flow_sip＝appid_str.app_sip；

flow_sla_str.flow_dip＝appid_str.app_dip；

flow_sla_str.flow_sport＝appid_str.app_sport；

flow_sla_str.flow_dport＝appid_str.app_dport；

flow_sla_str.flow_proto＝appid_str.app_proto；

flow_sla_str.flow_band＝app_sla_array[id].app_band；

4.2.6 sends flow _ sla _ str to the path optimization module, go to step 4.2.2.

4.3 the path optimization module calculates and optimizes the network flow transmission path according to the network flow service quality perception data and the network measurement data according to the method described in 4.3.1-4.3.12:

4.3.1 the path optimization module receives N and ip _ array from the initialization module.

4.3.2 the path optimization module judges whether the service quality perception data comes, if so, the step 4.3.6 is carried out; otherwise, go to step 4.3.3.

4.3.3 the path optimization module judges whether network measurement data comes, if so, the step 4.3.4 is switched to; otherwise, go to step 4.3.2.

4.3.4 receives the BN and link _ band _ array from the network measurement system.

4.3.5 calculating the network topology data topo _ array according to the link _ band _ array, wherein the calculation method refers to the steps from 4.2.4 to 4.2.5 of the bandwidth guaranteed network transmission method based on SRv6 and bandwidth measurement (refer to Yulien Yu, Zhao Baokang, Peng Wei, Zhao Feng, Shiyuanquan, Hao Jing. the bandwidth guaranteed network transmission method based on SRv6 and bandwidth measurement: Chinese patent, application No. 202111250341.0, 26/10/2021). Go to step 4.3.2.

4.3.6 receives flow _ sla _ str from the quality of service awareness module.

4.3.7, calculating node numbers of a source node and a destination node of the network flow represented by flow _ sla _ str in the network topology, wherein the method comprises the following steps:

4.3.7.1 obtains the IP address of the source node, i.e. flow _ sla _ str.flow _ sip, traverses the array IP _ array, finds out the elements with the field device _ IP equal to flow _ sla _ str.flow _ sip, and assumes IP _ array [ k1], the node number sid of the source node is: id is ip _ array [ k1]. device _ id, k1 has only one value, is a number that conforms to the "element whose field device _ ip is equal to flow _ sla _ str.

4.3.7.2 obtains the IP address of the destination node, i.e. flow _ sla _ str.flow _ dip, traverses the array IP _ array, finds out the elements with the field device _ IP equal to flow _ sla _ str.flow _ dip, and assumes IP _ array [ k2], the node number of the source node, di, is: d is ip _ array [ k2]. device _ id, k2 is a number conforming to the "element whose field device _ ip is equal to flow _ sla _ str.

4.3.8 calculating all paths between the side and the did according to N and topo _ array, the calculation method is described in the patent application-bandwidth guaranteed network transmission method based on SRv6 and bandwidth measurement (refer to original yule, Zhaobaokang, Pengwei, Zhaofengo, Shiquan, ceramic. the bandwidth guaranteed network transmission method based on SRv6 and bandwidth measurement: China patent, application No. 202111250341.0, 26.10/26/2021) 4.3.5, the calculation results are the number of paths between the side and the did, the number of forwarding nodes per path NN array (NN has a plurality of elements, the ith _ NN element stores the number of forwarding nodes in the ith _ NN path, i _ NN is 1,2, …, pn) and the number of forwarding nodes in the pn array where the pn path passes sequentially (node _ array is a two-dimensional array, node _ array, a plurality of elements in the node _ array, and each element is a common node _ array element And the group sequentially stores the forwarding node numbers in the ith _ node _ array path, each element stores one forwarding node number, and NN [ i _ node _ array ] elements are shared, wherein NN [ i _ node _ array ] represents the number of the forwarding nodes in the ith _ node _ array path).

4.3.9 calculate the optimized path of the source node and the destination node of the network flow represented by flow _ sla _ str, that is, according to the first path between pn, NN, node _ array calculation node sid and node did, which satisfies that the minimum link bandwidth is greater than flow _ sla _ str.flow _ band, the detailed method is as in the invention patent application — bandwidth guarantee network transmission method based on SRv6 and bandwidth measurement (see original yu epi-lite, zhao bao kang, peng wei, zhao kuo, shigao quan, and pottery; bandwidth guarantee network transmission method based on SRv6 and bandwidth measurement: chinese patent, application No. 202111250341.0, 26.10 months and 26 days 2021) from step 4.4.7.4 to step 4.4.7.11, and the calculation result is the number kk of the path in node _ array (i.e., the kk element of node _ array is the optimized path, and kk is i2 in 202111250341.0).

4.3.10, constructing network application transmission path data app _ path _ str, acquiring current system time ct1, and order:

app_path_str.app_t＝ct1；

app_path_str.sip＝flow_sla_str.flow_sip；

app_path_str.dip＝flow_sla_str.flow_dip；

app_path_str.sport＝flow_sla_str.flow_sport；

app_path_str.dport＝flow_sla_str.flow_dport；

app_path_str.nn＝NN[kk]；

4.3.11 is the value assigned to path _ array of app _ path _ str by:

4.3.11.1 defines a loop variable i-0.

4.3.11.2 loop array IP _ array, find out the element whose field device _ id is equal to node _ array [ kk ] [ i ] (since node _ array [ kk ] [ i ] is the number of forwarding node in network, IP _ array records the number and IP data of all forwarding nodes in network, so it can be found in the design of the invention), assume IP _ array _ i.

4.3.11.3 let app _ path _ str _ path _ array [ i ] ═ ip _ array _ i.device _ ip.

4.3.11.4 let i equal i +1, go to step 4.3.11.2 if i < app _ path _ str.nn, otherwise go to step 4.3.12.

4.3.12 sends app _ path _ str to the transmission control module, go to step 4.3.2.

4.4 the transmission control module calculates and optimizes the network flow transmission path according to the network flow service quality perception data and the network measurement data according to the method described in 4.4.1-4.4.11, and realizes the guarantee of the applied network service quality:

4.4.1 the transmission control module receives T from the initialization module.

4.4.2 the transmission control module monitors the path optimization module and the external network, when app _ path _ str arrives, the step 4.4.3 is carried out, when network messages arrive, the step 4.4.4 is carried out to receive the network messages, otherwise, the step 4.4.2 is carried out to continue monitoring.

4.4.3 the transmission control module receives app _ path _ str from the path optimization module, adds app _ path _ str to the network application transmission path linked list app _ path _ list, and goes to step 4.4.2.

4.4.4 the transmission control module receives the network message pkt from the external network.

4.4.5 extracts the source IP address pkt _ sip, the destination IP address pkt _ dip, the source port pkt _ sport and the destination port pkt _ dport from pkt.

4.4.6 traverse app _ path _ list, find the element whose domain flow _ sip equals pkt _ sip and domain flow _ dip equals pkt _ dip and domain flow _ port equals pkt _ port and domain flow _ dport equals pkt _ dport, if found, assume app _ path _ pkt, go to step 4.4.7, if not found, go to step 4.4.11.

4.4.7 obtains the current system time ct2, determines whether app _ path _ pkt. app _ T + T > ct2 is true, if true, go to step 4.4.8, otherwise go to step 4.4.10.

And 4.4.8, updating the latest message transmission time of the network application transmission path data, and enabling app _ path _ pkt.

4.4.9 sequentially uses the IP addresses in the array app _ path _ pkt.path _ array, and encapsulates SRv6 the pkt Header (SRv6 Header only has IPv6 address list and other fields are determined or are related to IPv6 address list, that is, SRv6 Header can be determined as long as the IPv6 address list is determined) according to SRH specification (refer to IETF standard c.filsfils, d.dukes (ed.) et al, "IPv6 Segment Routing Header (SRH)," RFC8754, [ Online ]. Available: https:// tools.ietf.org/html/RFC8754), and sends the encapsulated packet to the network (after the network receives the packet, the packet is forwarded hop by hop according to SRv6 Header, so that each packet of the network flow is implemented according to the application-aware service quality and the transmission path quality is calculated according to the application-aware service quality and the transmission path quality). Go to step 4.4.2.

4.4.10 deletes app _ path _ pkt from app _ path _ list, go to step 4.4.11.

4.4.11 sends the network message pkt to the network. Go to step 4.4.2.

Based on SRv6 technology, an active application perception method and real-time network measurement data, the invention designs a network service quality guarantee method aiming at application flow level application insensibility and network insensibility, and can solve the problem that the existing network can not provide network service quality guarantee aiming at application.

The invention can achieve the following technical effects:

1) the first step of the invention is to design an active application perception network service quality guarantee system based on SRv6 and network measurement, to use the existing application identification technology to perceive the application type, and then perceive the service quality requirement of the application, to calculate the transmission path meeting the service quality requirement for the network flow of the application according to the network measurement data, to use SRv6 technology to control the transmission path of the network message, to realize the network service quality guarantee of the application.

2) According to the invention, the network application and the service quality requirement thereof are written into the configuration file in the second step, and the network application and the service quality requirement thereof are read from the configuration file and sent to the service quality sensing module in the third step, so that the active application sensing service quality guarantee system configures different service quality requirements for different applications according to the requirements, and flexible configuration of the application service quality requirements is realized.

3) The invention step 4.1 and step 4.2 are applied and applied the type and service quality requirement of the perception voluntarily, there is no requirement for existing application, have realized the application of the quality of service guarantee is not felt; and 4.4, controlling the network message to be transmitted according to a path meeting the service quality requirement based on the SRv6 technology without participation of a controller, thereby realizing the noninductive control of a network control plane.

4) The invention can support any network application based on TCP/IP protocol, and has good universality.

Drawings

FIG. 1 is a general flow diagram of the present invention;

FIG. 2 is a logic structure diagram of the active application aware network QoS guarantee system constructed in the first step of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, the present invention comprises the steps of:

as shown in fig. 2, the active application-aware network qos securing system is composed of a configuration file, an initialization module, an application awareness module, a qos awareness module, a path optimization module, and a transmission control module.

The path optimization module is connected with an initialization module, a service quality perception module, a transmission control module and an external Network measurement system (generally realized by adopting active detection technologies such as INT and SNMP protocols, and can refer to Andrea Campella, Jonghwan Hyun, In-band Network telemetery (INT) with ONOS and P4[ EB/OL ] on Apr 25,2019 (see https:// wiki. onproject. org/display/ONOS/In-band + Network + telemetery +% 28INT + 29+ with ONOS + and + P4,2019-04-25. implementation of the Network measurement system) or Zhufengsky. The path optimization module receives the number N of network forwarding nodes and the IP address array IP _ array of the nodes from the initialization module, receives the flow _ sla _ str of the service quality sensing data from the service quality sensing module, and receives the network measurement data from the external network measurement system, wherein the network measurement data consists of a network bandwidth data array link _ band _ array and the number BN of bandwidth data. There are BN elements in the link _ band _ array, each element storing one bandwidth data. Each bandwidth data includes 3 fields: the number of the start node of the network link where the data is located is start _ id, the number of the end node of the network link where the data is located is end _ id, and the bandwidth band of the network link where the data is located. The path optimization module calculates network topology data according to the network measurement data, wherein the network topology data are composed of an adjacency list array topo _ array, N elements are arranged in the topo _ array in total, and each element stores one adjacency list data. Adjacency list data includes 3 fields: the adjacency list represents the number nid of the network forwarding node, the number an of the network forwarding nodes directly connected with the network forwarding node with the number nid, and the number array id _ array of the network forwarding nodes directly connected with the network forwarding node with the number nid (each element in id _ array stores the number of one network forwarding node directly connected with the network forwarding node with the number nid, and has an element in total, and an is a positive integer). And the path optimization module calculates all paths between the node where the source IP is located and the node where the destination IP is located in the service quality perception data according to the network topology data, selects a path meeting the service quality requirement, and constructs network application transmission path data app _ path _ str. app _ path _ str stores path information of a network application being transmitted, and comprises 7 fields: the time when the network application recently transmits the packet (i.e. app _ t), the source IP of the network application (i.e. sip), the destination IP of the network application (i.e. dip), the source port of the network application (i.e. sport), the destination port of the network application (i.e. dport), the number of nodes in the transmission path of the network application (i.e. nn), and the IP array of the transmission path nodes of the network application (i.e. pathip _ array). The path optimization module sends app _ path _ str to the transmission control module.

The transmission control module is connected with the initialization module, the path optimization module and the external network. The transmission control module receives T from the initialization module, and internally maintains a network application transmission path linked list app _ path _ list, wherein each element in the app _ path _ list stores transmission path data of one network application. The network application transmission path data structure is app _ path _ str. The transmission control module receives the network application transmission path data app _ path _ str from the path optimization module and stores the data app _ path _ str into app _ path _ list. The transmission control module receives the network message pkt from the external network, and searches the network application to which the network flow of the pkt belongs from the app _ path _ list according to the source IP, the destination IP, the source port, the destination port and the protocol number of the pkt. If the corresponding network application is found in the app _ path _ list, the transmission control module packages the pkt data into a service quality guarantee message pkt _ sla by using the network application transmission path data, and sends the pkt _ sla to an external network; and if the corresponding network application is not found, the transmission control module directly sends the pkt to an external network.

the method comprises the following steps: the application perception module receives network application transmission failure time from the initialization module according to the flow of 4.1, receives a network message of an external network through a network shunt, judges whether a network flow where the network message is located has an identification result according to data such as a source IP, a destination IP, a source port, a destination port, a protocol number and the like of the network message and an application identification result linked list, discards the network message if the network flow where the network message is located has the identification result, identifies the name of the network application where the network flow where the network message is located if the network flow where the network message is located does not have the identification result, constructs network application identification result data according to the identification result, adds the network application identification result data into the application identification result linked list, sends the network application identification result linked list to the service quality perception module, judges whether an element in the application identification result linked list is failed according to the network application transmission failure time, and deletes the failed element; meanwhile, the service quality perception module receives the number of the network applications, the name of each network application and the service quality requirement from the initialization module according to the flow of 4.2, receives the network application identification result from the application perception module, constructs network flow service quality data, and sends the network flow service quality data to the path optimization module; meanwhile, the path optimization module receives the network application transmission failure time from the initialization module according to the flow of 4.3, receives network stream service quality data from the service quality perception module, monitors the network measurement system and receives network measurement data from the network measurement system, calculates the network topology data of the current external network according to the network measurement data, calculates all possible paths of the network stream where each network application is located according to the real-time network topology data, calculates the paths meeting the service quality requirements of the network streams according to the network stream service quality data, constructs network application transmission path data, and sends the network application transmission path data to the transmission control module; meanwhile, the transmission control module receives the network application transmission failure time from the initialization module according to the flow of 4.4, receives the network application transmission path data from the path optimization module, updates the network application transmission path linked list according to the network application transmission path data, receives the network message from the external network, searches the transmission path of the network application corresponding to the network flow from the network application transmission path linked list according to the source IP, the destination IP, the source port, the destination port, the protocol number and the like of the network message, encapsulates the network message into a service quality guarantee message according to the IP address of the network equipment in the transmission path if the transmission path is found, and sends the service quality guarantee message to the external network, and directly sends the network message to the external network if the service quality guarantee message is not found.

domain app _ sip — sip 1;

domain app _ dip ═ dip 1;

domain app _ sport ═ sport 1;

domain app _ dport — dport 1;

domain app _ proto — proto 1;

appid_str.app_name＝name1；

appid_str.app_time＝ct；

appid_str.app_sip＝sip1；

appid_str.app_dip＝dip1；

appid_str.app_sport＝sport1；

appid_str.app_dport＝dport1；

appid_str.app_proto＝proto1；

4.2.5 construct network flow quality of service data flow _ sla _ str with:

flow_sla_str.flow_sip＝appid_str.app_sip；

flow_sla_str.flow_dip＝appid_str.app_dip；

flow_sla_str.flow_sport＝appid_str.app_sport；

flow_sla_str.flow_dport＝appid_str.app_dport；

flow_sla_str.flow_proto＝appid_str.app_proto；

flow_sla_str.flow_band＝app_sla_array[id].app_band；

4.2.6 sends flow _ sla _ str to the path optimization module, go to step 4.2.2.

4.3 the path optimization module calculates and optimizes the network flow transmission path according to the network flow service quality perception data and the network measurement data according to the method described in 4.3.1-4.3.11:

4.3.6 receives flow _ sla _ str from the quality of service awareness module.

app_path_str.app_t＝ct1；

app_path_str.sip＝flow_sla_str.flow_sip；

app_path_str.dip＝flow_sla_str.flow_dip；

app_path_str.sport＝flow_sla_str.flow_sport；

app_path_str.dport＝flow_sla_str.flow_dport；

app_path_str.nn＝NN[kk]；

4.3.11 is the value assigned to path _ array of app _ path _ str by:

4.3.11.1 defines a loop variable i-0.

4.4 the transmission control module calculates and optimizes the network stream transmission path according to the network stream service quality perception data and the network measurement data according to the method described in 4.4.1-4.4.11:

4.4.10 deletes app _ path _ pkt from app _ path _ list, go to step 4.4.11.

4.4.11 sends the network message pkt to the network. Go to step 4.4.2.

Claims

1.A network service quality guarantee method for active application perception is characterized by comprising the following steps:

the active application perception network service quality guarantee system consists of a configuration file, an initialization module, an application perception module, a service quality perception module, a path optimization module and a transmission control module;

the configuration file stores parameters required by the operation of the active application perception network service quality guarantee system, wherein the parameters comprise network application transmission failure time T, the number N of forwarding nodes in a network, N being a positive integer, the numbers and IP addresses of the N network forwarding nodes, the number AN of network applications, and the name and service quality requirements of each network application;

the initialization module is connected with the configuration file, the application sensing module, the service quality sensing module, the path optimization module and the transmission control module; the initialization module reads the number N of forwarding nodes in a network and the transmission failure time T of network application from a configuration file, respectively reads the numbers and IP addresses of the N network forwarding nodes from the configuration file according to the sequence, stores the IP addresses of the network forwarding nodes into an IP address array IP _ array, wherein the IP _ array has N elements, each element has two fields, one field is the number device _ id of the network forwarding node, and the other field is the IP address device _ IP of the network forwarding node with the corresponding number; reading the number AN of network applications from the configuration file, respectively reading the names and service quality requirements of the AN network applications from the configuration file according to the sequence, and storing the names and service quality requirements of the network applications into a service quality data array app _ sla _ array, wherein the app _ sla _ array has AN elements, each element has two domains, one domain is the name app _ name of the network application, and the other domain is the service quality requirement app _ band of the corresponding name network application; the initialization module sends AN and app _ sla _ array to the service quality perception module, sends N and ip _ array to the path optimization module, and sends T to the application perception module and the transmission control module;

the application sensing module is connected with the initialization module and the service quality sensing module and is connected with an external network through a network shunt; the application sensing module internally maintains an application identification result linked list appid _ list, each element in the linked list is application identification result data appid _ str, and appid _ str comprises 7 fields: the method comprises the following steps that the name of a network application is app _ name, the arrival time of a latest message of a stream where the network application is located is app _ time, a source IP where the network application is located is app _ sip, a destination IP where the network application is located is app _ dip, a source port where the network application is located is app _ sport, a destination port where the network application is located is app _ dport, and a protocol number where the network application is located is app _ proto; the application sensing module receives a network message of an external network through a network shunt, identifies a network application name to which the network message belongs through an application identification method, constructs application identification result data appid _ str, sends the application identification result data appid _ str to the service quality sensing module, and simultaneously adds the application identification result data appid _ str into an application identification result linked list; receiving network application transmission failure time T from an initialization module, and judging whether network application transmission fails or not;

the service quality sensing module is connected with the initialization module, the application sensing module and the path optimization module; the service quality perception module receives the number AN of the network applications and the service quality data array app _ sla _ array from the initialization module, and receives application identification result data appid _ str from the application perception module; constructing network flow service quality data flow _ sla _ str according to app _ sla _ array and appid _ str, wherein the flow _ sla _ str comprises 6 fields: a source IP (flow _ sip) of the network flow, a destination IP (flow _ dip) of the network flow, a source port of the network flow, a destination port of the network flow, a protocol number of the network flow, a flow _ proto and a service quality requirement of the network flow, namely a flow _ band; sending flow _ sla _ str to the path optimization module;

the path optimization module is connected with the initialization module, the service quality perception module, the transmission control module and the external network measurement system; the path optimization module receives the number N of network forwarding nodes and a node IP address array IP _ array from the initialization module, receives service quality sensing data flow _ sla _ str from the service quality sensing module, and receives network measurement data from an external network measurement system, wherein the network measurement data consists of a network bandwidth data array link _ band _ array and a bandwidth data number BN; the link _ band _ array has BN elements in total, and each element stores one bandwidth datum; each bandwidth data includes 3 fields: the number of a starting node of a network link where the data is located is start _ id, the number of a terminating node of the network link where the data is located is end _ id, and the bandwidth band of the network link where the data is located; the path optimization module calculates network topology data according to network measurement data, wherein the network topology data are composed of an adjacency list array topo _ array, N elements are arranged in the topo _ array in total, and each element stores adjacency list data; adjacency list data includes 3 fields: each element in the network forwarding node number nid represented by the adjacency list, the number an of the network forwarding nodes directly connected with the network forwarding node with the number nid, and the network forwarding node number array id _ array directly connected with the network forwarding node with the number nid, wherein the id _ array stores the number of one network forwarding node directly connected with the network forwarding node with the number nid, an elements are shared in total, and an is a positive integer; the path optimization module calculates all paths between a node where a source IP is located and a node where a destination IP is located in the service quality perception data according to the network topology data, selects a path meeting the service quality requirement, and constructs network application transmission path data app _ path _ str; app _ path _ str stores path information of a network application being transmitted, and comprises 7 fields: the method comprises the steps that the time when a network application transmits a message recently is app _ t, the source IP of the network application is sip, the destination IP of the network application is dip, the source port of the network application is sport, the destination port of the network application is dport, the number of nodes in a transmission path of the network application is nn, and an IP array of nodes of the transmission path of the network application is pathaddress _ array; the path optimization module sends the app _ path _ str to the transmission control module;

the transmission control module is connected with the initialization module, the path optimization module and the external network; the transmission control module receives T from the initialization module, and internally maintains a network application transmission path linked list app _ path _ list, wherein each element in the app _ path _ list stores transmission path data of one network application; the data structure of the network application transmission path is app _ path _ str; the transmission control module receives network application transmission path data app _ path _ str from the path optimization module and stores the data app _ path _ str into app _ path _ list; the transmission control module receives a network message pkt from an external network, and searches network application to which a network flow where the pkt belongs from app _ path _ list according to a source IP, a destination IP, a source port, a destination port and a protocol number of the pkt; if the corresponding network application is found in the app _ path _ list, the transmission control module packages the pkt data into a service quality guarantee message pkt _ sla by using the network application transmission path data, and sends the pkt _ sla to an external network; if the corresponding network application is not found, the transmission control module directly sends the pkt to an external network;

determining transmission failure time T of the network application, and writing the T into a configuration file; counting the number N of forwarding nodes in the network according to the network topology of the application network, and writing N into a configuration file; respectively writing the serial numbers of the N network devices and the corresponding IP addresses into a configuration file according to the IP address of each network device in the application network and the serial number in the network topology corresponding to each network device; according to the number AN of the network applications in the application network, the name and the service quality requirement of each network application, sequentially writing the names and the service quality requirements of the AN and the AN network applications into a configuration file;

3.1 reading T, N from the configuration file, and reading the serial numbers and IP addresses of the N network devices in sequence;

3.2 initializing IP _ array, namely respectively storing the serial numbers and IP addresses of N network devices into N elements of the IP _ array;

3.3 reading AN from the configuration file, and reading the names and service quality requirements of AN network applications in sequence;

3.4 initializing app _ sla _ array, namely respectively storing the names and service quality requirements of AN network applications into AN elements of app _ sla _ array;

3.5 sending the T to an application sensing module and a transmission control module; sending the N and the ip _ array to a path optimization module; sending AN and app _ sla _ array to a quality of service awareness module;

the method comprises the following steps: the application perception module realizes the application perception of the network message according to the flow of 4.1; meanwhile, the service quality perception module realizes the service quality perception of the network flow according to the flow of 4.2; meanwhile, the path optimization module calculates and optimizes a network flow transmission path according to the flow of 4.3 and the network flow service quality perception data and the network measurement data; meanwhile, the transmission control module calculates and optimizes a network flow transmission path according to the flow of 4.4 according to the network flow service quality sensing data and the network measurement data, so that the network service quality guarantee of the application is realized;

4.1 the method for realizing the application perception of the network message by the application perception module is as follows: the application perception module receives network application transmission failure time from the initialization module, receives network messages of an external network through a network shunt, judges whether a network flow of the network messages has an identification result according to data such as source IP, destination IP, source port, destination port, protocol number and the like of the network messages and an application identification result linked list, discards the network messages if the network flow of the network messages has the identification result, identifies the name of the network application of the network flow of the network messages if the network flow of the network messages does not have the identification result, constructs network application identification result data according to the identification result, adds the network application identification result data into the application identification result linked list, sends the application identification result linked list to the service quality perception module, judges whether elements in the application identification result linked list fail according to the network application transmission failure time, and deletes the failed elements;

4.2 the method for realizing the service quality perception of the network flow by the service quality perception module is as follows: the service quality perception module receives the number of the network applications, the name of each network application and the service quality requirement from the initialization module, receives the network application identification result from the application perception module, constructs network flow service quality data and sends the network flow service quality data to the path optimization module;

4.3 the method for the path optimization module to calculate and optimize the network flow transmission path according to the network flow service quality perception data and the network measurement data is as follows: the path optimization module receives the transmission failure time of the network application from the initialization module, receives the service quality data of the network flow from the service quality perception module, receives the network measurement data from the network measurement system, calculates the network topology data of the current external network according to the network measurement data, calculates all possible paths of the network flow where each network application is located according to the real-time network topology data, calculates the paths meeting the service quality requirements of the network flow according to the service quality data of the network flow, constructs the transmission path data of the network application, and sends the transmission path data to the transmission control module;

4.4 the transmission control module utilizes the network flow transmission path data to package the message into the network service quality guarantee message, and the method for realizing the network service quality guarantee of the application is as follows: the transmission control module receives the transmission failure time of the network application from the initialization module, receives the transmission path data of the network application from the path optimization module, updates a network application transmission path linked list according to the transmission path data of the network application, receives the network message from an external network, searches a transmission path of the network application corresponding to the network flow from the network application transmission path linked list according to the source IP, the destination IP, the source port, the destination port, the protocol number and the like of the network message, encapsulates the network message into a service quality guarantee message according to the IP address of the network equipment in the transmission path if the transmission path is found, and transmits the service quality guarantee message to the external network, and directly transmits the network message to the external network without network service quality guarantee if the transmission path is not found.

2. The proactive application-aware network quality of service assurance method according to claim 1, wherein the network application transmission failure time T is a positive integer in units of seconds; the number N of forwarding nodes in the network is more than or equal to 3; the number AN of network applications in the application network is more than or equal to 1.

3. The proactive application-aware network quality of service assurance method according to claim 2, wherein the T is 90 seconds.

4. The method for guaranteeing network service quality as defined by claim 1, wherein the specific method for the application-aware module to implement application-awareness of network packets in step 4.1 is:

4.1.1 the application sensing module receives the network application transmission failure time T from the initialization module, and the initialization application identification result linked list appid _ list is empty;

4.1.2 monitoring the network shunt by the application sensing module, if a network message arrives, turning to the step 4.1.3, otherwise, turning to the step 4.1.2 to continue monitoring;

4.1.3 receiving the network message, obtaining a source IP address sip1, a destination IP address dip1, a source port sport1, a destination port dport1 and a protocol number proto1 of the network message, and obtaining the current system time ct;

domain app _ sip — sip 1;

domain app _ dip ═ dip 1;

domain app _ sport ═ sport 1;

domain app _ dport — dport 1;

domain app _ proto — proto 1;

if not found, go to step 4.1.5, if found, assume that the found element is app1, go to step 4.1.8;

4.1.5 using the network message as a detection sample, using a multilayer classifier method to identify the network application to which the network flow of the network message belongs, if the identification is successful, assuming that the name of the identified network application is name1, turning to step 4.1.6, if the identification is failed, discarding the network message, and turning to step 4.1.2;

appid_str.app_name＝name1；

appid_str.app_time＝ct；

appid_str.app_sip＝sip1；

appid_str.app_dip＝dip1；

appid_str.app_sport＝sport1；

appid_str.app_dport＝dport1；

appid_str.app_proto＝proto1；

4.1.7 adding the appid _ str into the appid _ list and sending the appid _ str to the service quality perception module; turning to step 4.1.2;

5. The method for guaranteeing network service quality as claimed in claim 1, wherein the specific method for implementing service quality awareness of network flows by the service quality awareness module in step 4.2 is as follows:

4.2.1 the quality of service aware module receives AN and app _ sla _ array from the initialization module;

4.2.2 the service quality sensing module monitors the application sensing module, if there is an appid _ str coming, the step 4.2.3 is carried out, otherwise, the step 4.2.2 is carried out to continue monitoring;

4.2.3 the QoS aware module receives the appid _ str from the application aware module;

4.2.4 the service quality perception module searches the element with the same value of the domain app _ name as the value of app _ str. app _ name from app _ sla _ array, if found, the found element is assumed to be app _ sla _ array [ id ], go to step 4.2.5, otherwise go to step 4.2.2;

4.2.5 construct network flow quality of service data flow _ sla _ str with:

flow_sla_str.flow_sip＝appid_str.app_sip；

flow_sla_str.flow_dip＝appid_str.app_dip；

flow_sla_str.flow_sport＝appid_str.app_sport；

flow_sla_str.flow_dport＝appid_str.app_dport；

flow_sla_str.flow_proto＝appid_str.app_proto；

flow_sla_str.flow_band＝app_sla_array[id].app_band；

4.2.6 sends flow _ sla _ str to the path optimization module, go to step 4.2.2.

6. The method for guaranteeing network qos as claimed in claim 1, wherein the specific method for the path optimization module to calculate and optimize the transmission path of the network stream according to the qos-aware data and the network measurement data in step 4.3 is:

4.3.1 the path optimization module receives N and ip _ array from the initialization module;

4.3.2 the path optimization module judges whether the service quality perception data comes, if so, the step 4.3.6 is carried out; otherwise, turning to the step 4.3.3;

4.3.3 the path optimization module judges whether network measurement data comes, if so, the step 4.3.4 is switched to; otherwise, turning to the step 4.3.2;

4.3.4 receiving BN and link _ band _ array from the network measurement system;

4.3.5 calculating the network topology data topo _ array according to the link _ band _ array, and turning to the step 4.3.2;

4.3.6 receive flow _ sla _ str from the quality of service awareness module;

4.3.7 calculating node numbers of a source node and a destination node of the network flow represented by flow _ sla _ str in the network topology;

4.3.8, calculating all paths between the node sid and the node did according to N and topo _ array to obtain the number pn of paths between the node sid and the node did, the number array NN of forwarding nodes in each path and the number array node _ array of forwarding nodes through which the pn paths sequentially pass; the NN shares pn elements, the ith _ NN element stores the number of forwarding nodes in the ith _ NN path, and the i _ NN is 1,2, … and pn; the node _ array is a two-dimensional array, pn elements are shared in the node _ array, and each element is an array; the ith _ node _ array element in the node _ array is an array for storing the number of forwarding nodes in the ith _ node _ array path, the array sequentially stores the number of forwarding nodes in the ith _ node _ array path, each element stores one number of forwarding nodes, NN [ i _ node _ array ] elements are shared, and NN [ i _ node _ array ] represents the number of forwarding nodes in the ith _ node _ array path;

4.3.9 calculating an optimized path of a source node and a destination node of a network flow represented by flow _ sla _ str, namely calculating a first path between a node sid and a node did according to pn, NN, node _ array, wherein the minimum link bandwidth is greater than flow _ sla _ str, flow _ band, and calculating the number kk of the path in the node _ array, namely the number kk of the optimized path in the node _ array;

app_path_str.app_t＝ct1；

app_path_str.sip＝flow_sla_str.flow_sip；

app_path_str.dip＝flow_sla_str.flow_dip；

app_path_str.sport＝flow_sla_str.flow_sport；

app_path_str.dport＝flow_sla_str.flow_dport；

app_path_str.nn＝NN[kk]；

4.3.11 is the path _ array value of app _ path _ str;

7. The active application aware network quality of service assurance method of claim 6, wherein the method of computing node numbers of the source node and the destination node of the network flow represented by flow _ sla _ str in the network topology in step 4.3.7 is:

4.3.7.1 obtains the IP address of the source node, i.e. flow _ sla _ str.flow _ sip, traverses the array IP _ array, finds out the elements with the field device _ IP equal to flow _ sla _ str.flow _ sip, and assumes IP _ array [ k1], the node number sid of the source node is: id — ip _ array [ k1]. device _ id, k1 is a number conforming to the "element whose field device _ ip is equal to flow _ sla _ str.flow _ sip";

8. The active application-aware network quality of service assurance method of claim 6, wherein the method for assigning a path _ array value to an app _ path _ str in 4.3.11 steps is:

4.3.11.1 define a loop variable i-0;

4.3.11.2, cycling an array ip _ array, and searching elements with the field device _ id equal to the node _ array [ kk ] [ i ], assuming that ip _ array _ i;

4.3.11.3 let app _ path _ str.path _ array [ i ] ═ ip _ array _ i.device _ ip;

4.3.11.4, if i is equal to i +1, if i is less than app _ path _ str.nn, go to step 4.3.11.2, otherwise, the assignment is finished, and the process is ended.

9. The method for guaranteeing network service quality as defined in claim 1, wherein the transmission control module in step 4.4 encapsulates the packet into a network service quality guarantee packet by using the network stream transmission path data, and the specific method for guaranteeing the network service quality of the application is as follows:

4.4.1 the transmission control module receives T from the initialization module;

4.4.2 the transmission control module monitors the path optimization module and the external network, when app _ path _ str arrives, the step 4.4.3 is carried out, when a network message arrives, the step 4.4.4 is carried out to receive the network message, otherwise, the step 4.4.2 is carried out to continue monitoring;

4.4.3, the transmission control module receives the app _ path _ str from the path optimization module, adds the app _ path _ str into the network application transmission path linked list app _ path _ list, and goes to step 4.4.2;

4.4.4 the transmission control module receives the network message pkt from the external network;

4.4.5 extracting a source IP address pkt _ sip, a destination IP address pkt _ dip, a source port pkt _ sport and a destination port pkt _ dport from pkt;

4.4.6 traverse app _ path _ list, find the element whose domain flow _ sip equals pkt _ sip and domain flow _ dip equals pkt _ dip and domain flow _ port equals pkt _ port and domain flow _ dport equals pkt _ dport, if found, assume app _ path _ pkt, go to step 4.4.7, if not found, go to step 4.4.11;

4.4.7 obtaining the current system time ct2, judging whether app _ path _ pkt. app _ T + T > ct2 is true, if true, turning to step 4.4.8, otherwise, turning to step 4.4.10;

4.4.8, updating the latest message transmission time of the network application transmission path data, and enabling app _ path _ pkt. app _ t to be ct 2;

4.4.9, sequentially using the IP addresses in the array app _ path _ pkt _ path _ array, encapsulating SRv6 message headers for pkt according to the SRH specification, and sending the encapsulated messages to the network, so that each message of the network flow is transmitted according to a path calculated according to the application sensing and service quality sensing results, and thus, the network service quality guarantee is realized; turning to step 4.4.2;

4.4.10 delete app _ path _ pkt from app _ path _ list, go to step 4.4.11;

4.4.11 sending the network message pkt to the network; go to step 4.4.2.