CN113676405A - Load sharing-based rapid link master-slave switching distributed system and method - Google Patents
Load sharing-based rapid link master-slave switching distributed system and method Download PDFInfo
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- H04L47/10—Flow control; Congestion control
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Abstract
The invention belongs to the technical field of image communication, and particularly relates to a load sharing-based rapid link master-slave switching distributed system and method. The system comprises a distributed sending end node, a distributed receiving end node, network switching equipment and a service management node. Each transmitting end node and each receiving end node in the system can realize multilink backup; the load of the service data of each node is shared among multiple working links, so that the system flow is not multiplied, and the system cost and stability are not influenced; meanwhile, when the link on the node fails, the data layer of the node automatically realizes the balance of the service data on each available link without the participation of the service layer, thereby achieving the requirement of fast and seamless service data switching and reducing the influence of the audio/video service link switching on the sense of people.
Description
Technical Field
The invention belongs to the technical field of image communication, and particularly relates to a load sharing-based rapid link master-slave switching distributed system and method.
Background
In the communication field, in order to ensure reliable transmission of links, key node devices in the system are often required to support main and standby links, and when a main link fails, the standby link can maintain normal operation to ensure normal operation of the system. The link active-standby technology is widely applied to an image communication system, particularly a distributed audio/video system. Since the audio-video data can be directly perceived through human senses, the link is required to be as fast and seamless as possible in the switching process so as to minimize the influence on the human senses.
The existing processing method of the link master and standby of the distributed audio and video system is to send completely same audio and video data on two links of a sending end node, a receiving end node receives two identical audio and video data, and one of the two identical audio and video data is selected randomly to be decoded and displayed.
The principle of the link backup mode is simple, and when one link fails, the receiving end node can quickly detect and switch to the other link. However, this approach has the disadvantage of increasing the data bandwidth by two or even N times (N >2 if multi-link active/standby is considered), which greatly increases the capacity and load of the switching device, and thus the overall cost of the system.
Disclosure of Invention
The invention aims to further improve the defects of the main and standby link technologies of the existing distributed audio and video system, and provides a load sharing-based rapid main and standby link switching distributed system and method, so that the main and standby links of nodes in the distributed audio and video system do not need to occupy more system bandwidth, and the rapid switching performance of the original link backup mode is maintained.
In order to achieve the above object, the present invention provides a load sharing-based fast link active/standby switching distributed system, which includes a distributed sending end node, a distributed receiving end node, a service management node and a network switching device; the distributed sending end node, the distributed receiving end node and the service management node are connected with the network switching equipment through standard network link interfaces; wherein:
the service management node receives the link backup requirement of the user, performs link limit configuration on the distributed sending node and the distributed receiving node, receives link state report and link alarm of the distributed sending node and the distributed receiving node, and feeds back the notice to the user for timely processing;
the distributed sending end node comprises a data flow control module, a first upper layer service module, a data scheduling and distributing module and a plurality of first link transceiving modules; wherein:
the data flow control module is used for carrying out flow calculation according to the link limit configured by the service management node and the actual available link fed back by the first link transceiving module and providing a calculation result to the first upper-layer service module;
the first upper-layer service module outputs coded service data according to the flow limited by the data flow control module;
the data scheduling and distributing module is used for receiving the coded data of the first upper layer service module and uniformly distributing the coded data to each available first link transceiving module;
the first link transceiving module is used for immediately sending the data to the network switching equipment through a physical link after receiving the data of the data scheduling and distributing module, and forwarding the data to the distributed receiving end node by the network switching equipment;
the distributed receiving end node comprises a second upper layer service module, a data receiving and routing module, an effective link indicating module and a plurality of second link transceiving modules; wherein:
the second link transceiver module receives the coded data forwarded by the network switching equipment and immediately transmits the coded data to the data receiving and routing module;
the effective link indicating module is used for acquiring the state of each second link transceiver module and reporting the available condition to the data receiving and routing module;
the data receiving and routing module is used for carrying out link distribution and activation according to the link limit configured by the service management node and the actual available link fed back by the second link transceiving module and transmitting the activated link receiving data to the second upper-layer service module;
and the second upper layer service module acquires the coded service data of the data receiving and routing module, and performs decoding display.
In the invention, after the distributed sending end node receives the link limit configuration N, the data flow control module calculates the actual service flow:
(1) acquiring the state of each first link transceiver module to obtain the total available link number K;
(2) if N < = K, informing the first upper-layer service module that the upper limit of the flow is N Pb, wherein Pb is the rated flow of the single link;
(3) and if N is larger than K, informing the first upper layer service module that the upper limit of the flow is K Pb, and reporting a link resource shortage alarm to the service management node.
In the invention, the data scheduling and distributing module monitors the state of each first link transceiver module, and evenly distributes service data to each available first link transceiver module in real time to realize load sharing of the service data; when a first link transceiver module is found to be in fault, a service data sending queue of the link is immediately removed.
In the invention, after the distributed receiving end node receives the link quota configuration M, the data receiving routing module activates the link routing:
(1) the effective link indicating module acquires the state of each second link transceiver module to obtain the total available link number L;
(2) if M < = L, activating M links in the L effective links, and receiving the coded service data;
(3) and if M is greater than L, activating the L link and reporting a link resource shortage alarm to the service management node.
In the invention, the data receiving and routing module monitors the state of each activated second link transceiver module, and once a certain second link transceiver module is found to be in fault, the service data receiving queue of the link is removed and the backup effective second link transceiver module is activated.
The invention also provides a method for fast switching the main and standby link distributed systems based on the load sharing.
Compared with the prior art, the rapid link master-slave switching distributed system and method based on load sharing disclosed by the invention have the following beneficial effects:
firstly, the main and standby modes of the links are more flexible, and each node can be realized by multiple links;
secondly, the link main and standby systems support data volume load sharing among links, so that system flow multiplication is avoided, and system cost and stability are not influenced;
when the availability of the link changes, the data layer (namely the data scheduling and distributing module and the data flow control module of the sending end node, the data receiving and routing module of the receiving end node and the effective link indicating module) automatically realizes the balance of the service data on each link, and the service layer (namely the first upper service module of the sending end node and the second upper service module of the receiving end node) is not required to participate, so that the quick and seamless service data switching can be realized, and the influence of the audio and video service link switching on the senses of people is reduced.
Drawings
Fig. 1 is a block diagram of a fast primary/standby link switching distributed system based on load sharing.
Fig. 2 is a block diagram of a distributed sender node.
Fig. 3 is a flow chart of the operation of a distributed sender node.
Fig. 4 is a block diagram of a distributed receiver node.
Fig. 5 is a flow chart of the operation of a distributed receiver node.
Detailed Description
The invention is explained in more detail below with reference to the figures and examples.
Example 1
As shown in fig. 1, a load sharing-based fast active/standby link switching distributed system includes a distributed sending-end node, a distributed receiving-end node, a network switching device, and a service management node. The distributed sending end node, the distributed receiving end node and the service management node are connected with the network switching equipment through standard network link interfaces. The service management node is used for configuring and managing link quota for each distributed transmitting end node according to the main/standby mode of the link required by the user, and the receiving end node is connected with the network switching equipment through a network interface; the network switching equipment is connected with each distributed transmitting end node and each distributed receiving end node through a plurality of links to realize link route switching among the nodes; the distributed sending end node is connected with the network switching equipment through a plurality of links, and the distributed receiving end node is connected with the network switching equipment through a plurality of links. The following specifically describes the structures and workflows of the distributed sender node, distributed receiver node, and service management node.
One) distributed sender node
The distributed transmitting end node receives an audio and video original data stream of a user side, transmits the encoded data stream to the distributed receiving end node through a plurality of links after audio and video encoding, and designs the link to be equal to the number n of the first link transceiving modules, wherein the link comprises a working link and a backup link; the structure of the distributed transmitting end node is shown in fig. 2, and the main and standby link subsystems are completed by three parts, specifically, a service layer (a first upper service module), a data layer (a data scheduling and distributing module and a data flow control module) and a physical layer (a plurality of first link transceiver modules);
the first upper-layer service module outputs coded service data according to the flow limited by the data flow control module;
the data flow control module is used for carrying out flow calculation according to the link limit configured by the service management node and the actual available link fed back by the physical layer and providing a calculation result to the first upper-layer service module;
the data scheduling and distributing module receives the coded data of the first upper layer service module and uniformly distributes the coded data to each available first link transceiver module, wherein the number of the first link transceiver modules is equal to the number of the working links
The first link transceiving module is used for immediately sending the data to the network switching equipment through a physical link after receiving the data of the data scheduling and distributing module, and forwarding the data to the distributed receiving end node by the network switching equipment;
fig. 3 shows a principle of link backup of a distributed sender node, and the specific method or steps thereof are as follows:
firstly, a service management node performs link quota configuration on a distributed sending end node according to a system backup requirement, namely the number of N is determined;
after the distributed sending end node receives the link limit configuration, the data flow control module calculates the actual service flow:
(1) acquiring the state of each first link transceiver module to obtain the total available link number K;
(2) if N < = K, informing the first upper layer service module that the upper limit of the flow is N Pb (Pb is the rated flow of the single link);
(3) if N is larger than K, informing the first upper layer service module that the upper flow limit is K & ltPb & gt, and reporting a link resource shortage alarm to the service management node;
after receiving the flow limitation of the data flow control module, the first upper layer service module limits the total service data output flow;
the data scheduling and distributing module monitors the state of each first link transceiver module, and evenly distributes service data to each available first link transceiver module in real time to realize load sharing of the service data; once a failure of a first link transceiver module is found, a service data transmission queue of the link is removed immediately without the participation of a first upper-layer service module, so that the fast and efficient switching of the main link and the standby link is ensured.
Two) distributed receiver node
And the distributed receiving end nodes receive the coded data on the plurality of links, and the coded data are decoded and then displayed uniformly. The number of designed links is equal to the number m of second link transceiver modules, the second link transceiver modules comprise working links and backup links, the structure of a distributed receiving end node is shown in fig. 4, and a main link subsystem and a standby link subsystem are completed by matching three parts, specifically, a service layer (a second upper service module), a data layer (a data receiving and routing module and an effective link indicating module) and a physical layer (a plurality of second link transceiver modules);
the second upper layer service module acquires the coded service data of the data receiving routing module, and performs decoding display;
the data receiving and routing module carries out link allocation and activation according to the link limit configured by the service management node and an actual available link fed back by the physical layer, and transmits activated link receiving data to the second upper-layer service module, wherein the activated link is a working link;
the effective link indicating module acquires the state of each second link transceiver module and reports the available condition to the data receiving routing module;
and the second link transceiver module immediately transmits the encoded data to the data receiving and routing module after receiving the encoded data forwarded by the network switching equipment.
Fig. 5 shows a principle of link backup of a distributed receiver node, and the specific method or steps thereof are as follows:
firstly, a service management node performs link quota configuration on a distributed receiving node according to a system backup requirement, namely the number of M is determined;
after the distributed receiving end node receives the link quota configuration, the data receiving routing module performs link routing activation:
(1) the effective link indicating module acquires the state of each second link transceiver module to obtain the total available link number L;
(2) if M < = L, activating M links in the L effective links, and receiving the coded service data;
(3) if M is larger than L, activating L links, and reporting a link resource shortage alarm to a service management node;
the data receiving and routing module monitors the state of each activated second link transceiver module, and once a certain second link transceiver module is found to be in fault, the service data receiving queue of the link is removed immediately, and the backup effective second link transceiver module is activated without the participation of a second upper-layer service module, so that the high speed and the high efficiency of the switching of the main link and the standby link are ensured.
Three) service management node
The service management node is used as an interactive window between a user and the system device, generates a specific command according to a user operation instruction and issues the specific command to each unit in the system device so as to enable the units to work cooperatively to meet the use requirement of the user; the method specifically comprises the following steps:
receiving a user link backup requirement, and performing link quota on a distributed sending end node and a distributed receiving end node;
receiving link state reports and link alarms of distributed transmitting end nodes and distributed receiving end nodes; and the notification is fed back to the user for timely processing.
In the foregoing, in the active/standby switching distributed system provided in the embodiment, the active/standby link systems support data load sharing between links, so that system traffic is not multiplied, and system cost and stability are not affected; the main and standby modes of the links are more flexible, and each node can realize multi-link backup; when the availability of the link changes, the data layer automatically realizes the balance of the service data on each link without the participation of the service layer, thereby realizing the rapid and seamless service data switching and reducing the influence of the audio/video service link switching on the sense of people.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A fast link master-slave switching distributed system based on load sharing is characterized in that the system comprises distributed sending
The system comprises end nodes, distributed receiving end nodes, service management nodes and network switching equipment; the distributed sending end node, the distributed receiving end node and the service management node are connected with the network switching equipment through standard network link interfaces; wherein:
the service management node receives the link backup requirement of the user, performs link limit configuration on the distributed sending node and the distributed receiving node, receives link state report and link alarm of the distributed sending node and the distributed receiving node, and feeds back the notice to the user for timely processing;
the distributed sending end node comprises a data flow control module, a first upper layer service module, a data scheduling and distributing module and a plurality of first link transceiving modules; wherein:
the data flow control module is used for carrying out flow calculation according to the link limit configured by the service management node and the actual available link fed back by the first link transceiving module and providing a calculation result to the first upper-layer service module;
the first upper-layer service module outputs coded service data according to the flow limited by the data flow control module;
the data scheduling and distributing module is used for receiving the coded data of the first upper layer service module and uniformly distributing the coded data to each available first link transceiving module;
the first link transceiving module is used for immediately sending the data to the network switching equipment through the link after receiving the data of the data scheduling and distributing module, and forwarding the data to the distributed receiving end node by the network switching equipment;
the distributed receiving end node comprises a second upper layer service module, a data receiving and routing module, an effective link indicating module and a plurality of second link transceiving modules; wherein:
the second link transceiver module receives the coded data forwarded by the network switching equipment and immediately transmits the coded data to the data receiving and routing module;
the effective link indicating module is used for acquiring the state of each second link transceiver module and reporting the available condition to the data receiving and routing module;
the data receiving and routing module is used for carrying out link distribution and activation according to the link limit configured by the service management node and the actual available link fed back by the second link transceiving module and transmitting the activated link receiving data to the second upper-layer service module;
and the second upper layer service module acquires the coded service data of the data receiving and routing module, and performs decoding display.
2. The distributed system for rapid active/standby switching of links as claimed in claim 1, wherein after the distributed sending end node receives the link quota configuration N, the data traffic control module performs actual traffic flow calculation:
(1) acquiring the state of each first link transceiver module to obtain the total available link number K;
(2) if N < = K, informing the first upper-layer service module that the upper limit of the flow is N Pb, wherein Pb is the rated flow of the single link;
(3) and if N is larger than K, informing the first upper layer service module that the upper limit of the flow is K Pb, and reporting a link resource shortage alarm to the service management node.
3. The distributed system for rapid active-standby switching of links according to claim 1, wherein the data scheduling and distributing module monitors the status of each first link transceiver module, and evenly distributes the service data to each available first link transceiver module in real time to realize load sharing of the service data; when a first link transceiver module is found to be in fault, a service data sending queue of the link is immediately removed.
4. The distributed system for rapid active/standby switching of links according to claim 1, wherein after receiving the configuration M of the link quota, the distributed receiver node performs the link routing activation by the data receiving routing module:
(1) the effective link indicating module acquires the state of each second link transceiver module to obtain the total available link number L;
(2) if M < = L, activating M links in the L effective links, and receiving the coded service data;
(3) and if M is greater than L, activating the L link and reporting a link resource shortage alarm to the service management node.
5. The distributed system for rapid active-standby switching of links according to claim 4, wherein the data receiving routing module monitors the status of each activated second link transceiver module, and once a failure of a second link transceiver module is found, the data receiving routing module removes the service data receiving queue from the link and activates the active second link transceiver module for backup.
6. A method for fast switching between main and standby links of a distributed system according to any one of claims 1 to 5, comprising a method for implementing link backup switching by a distributed sending end node, the method comprising the following steps:
firstly, a service management node performs link quota configuration on a distributed sending end node according to a system backup requirement, namely the number of N is determined;
after the distributed sending end node receives the link limit configuration, the data flow control module calculates the actual service flow:
(1) acquiring the state of each link transceiver module to obtain the total available link number K;
(2) if N < = K, informing the first upper-layer service module that the upper limit of the flow is N Pb, wherein Pb is the rated flow of the single link;
(3) if N is larger than K, informing the first upper layer service module that the upper flow limit is K & ltPb & gt, and reporting a link resource shortage alarm to the service management node;
after receiving the flow limitation of the data flow control module, the first upper layer service module limits the total service data output flow;
the data scheduling and distributing module monitors the state of each first link transceiver module, and evenly distributes service data to each available first link transceiver module in real time to realize load sharing of the service data; once a failure of a first link transceiver module is found, a service data transmission queue of the link is removed immediately without the participation of a first upper-layer service module, so that the fast and efficient switching of the main link and the standby link is ensured.
7. The method according to claim 6, comprising a method for implementing link backup switching by a distributed receiving end node, the method comprising the following steps:
firstly, a service management node performs link quota configuration on a distributed receiving node according to a system backup requirement, namely the number of M is determined;
after the distributed receiving end node receives the link quota configuration, the data receiving routing module performs link routing activation:
(1) the effective link indicating module acquires the state of each second link transceiver module to obtain the total available link number L;
(2) if M < = L, activating M links in the L effective links, and receiving the coded service data;
(3) if M is larger than L, activating L links, and reporting a link resource shortage alarm to a service management node;
the data receiving and routing module monitors the state of each activated second link transceiver module, and once a certain second link transceiver module is found to be in fault, the service data receiving queue of the link is removed immediately, and the backup effective second link transceiver module is activated without the participation of a second upper-layer service module, so that the high speed and the high efficiency of the switching of the main link and the standby link are ensured.
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| 孙玉闯等: "基于负载均衡技术的广电网络出口解决方案研究", 《广播与电视技术》 * |
| 綦朝晖: ""一种新的基于MPLS的路由算法"", 《计算机工程》 * |
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| CN113676405B (en) | 2022-10-14 |
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