TWI641268B - System of optical switch used in data center network - Google Patents

Abstract

The invention discloses an optical switching system applied to a data center network, comprising a front end buffer device, a central intelligent scheduling controller and an optical flow switch, wherein the central intelligent scheduling controller connects the front end buffer device and the optical flow a switch, wherein the front-end buffer device receives traffic traffic from a server group, and the central intelligent scheduling controller determines, according to the traffic information received by the front-end buffer device, that the traffic signal has a conflict condition. A smart scheduling algorithm is started to control the operation of the front-end buffer device, and a virtual optical path is established, and the optical traffic switch establishes the virtual state by using the central intelligent scheduling controller according to the control of the central intelligent scheduling controller. The optical path performs virtual optical circuit switching to achieve fast switching of the traffic.

Description

Optical switching system for data center networks

The present invention relates to a network system, and more particularly to an optical switching system for use in a data center network.

The Republic of China Patent No. I552536 discloses an optical data center network system and an optical switch, and the proposed optical switch is composed of a commercially available Wavelength Selective Switch (WSS), which is a network of optical data centers. The system is implemented in a three-layer architecture, including multiple first layer optical switches, multiple second layer optical switches, and multiple third layer optical switches, wherein multiple first layer optical switches pass through the ribbon optical fibers. The ribbon fibers are interconnected to form a pod, and the plurality of second layer optical switches are interconnected by the ribbon fibers to form a macro pod, and each of the second layer optical switches is coupled to All the first layer optical switches in a group are connected. Finally, multiple third layer optical switches are also connected to each other through the ribbon optical fibers, and each of the third layer optical switches is associated with all of the macro groups. The second layer of optical switch is connected. This patent is mainly for the optical data center network system, which is realized by the three-layer pyramid structure.

In addition, U.S. Patent Publication No. US 20140205292, the name of the invention Known as OPTICAL PACKET SWITCHING SYSTEM, it is a design of optical packet switch. The optical buffer is a general Fiber Delay Line design. It only uses long-term optical delay design, and there is no traffic flow intelligent scheduling. The optical buffer design is also not designed for optical buffer requirements on optical flow switches.

It can be seen from the above that the existing usage method cannot effectively improve the total amount of switching of the optical switch, so how to find a network system, in particular, can be applied to the data center network, and has the advantages of simplifying the device and improving the total exchange. Optical switching system, which will become the goal pursued by those skilled in the art

The invention provides an optical switching system, which can be applied to a data center network, mainly by using a smart scheduling mechanism technology and a system design of a programmable optical flow switch, so that the optical traffic switch originally in the data center is exchanged. Reduced, but with the intelligent scheduling mechanism, but the total exchange total (Throughput) is further increased than the original optical switch, looking forward to the reduction of the number of exchanges, but the overall system exchange total increase.

The present invention provides an optical switching system for a data center network, comprising: a front-end buffer device for receiving traffic traffic from a server group; and a central intelligent scheduling controller for connecting the front-end buffer device And determining, according to the traffic information received by the front-end buffer device, whether the traffic signal has a conflict condition, so as to determine that the traffic signal has a conflict condition, start an intelligent scheduling algorithm to control the front-end buffer The operation of the device and establish a virtual light path; and the optical flow switch, the connection The central intelligent scheduling controller and the front-end buffer device are configured to perform virtual optical circuit switching by using the virtual optical path established by the central intelligent scheduling controller according to the control of the central intelligent scheduling controller. Fast exchange of traffic messages.

In one embodiment, the front end buffer device is a 2n*n programmable L2 network switch. In addition, in response to the design of the front-end buffer device, the optical traffic switch is a n*n core optical traffic switch.

In another embodiment, the central intelligent scheduling controller determines that the traffic signal does not have a conflict condition, and sends a through command to the front end buffer device, so that the front end buffer device directly transmits the traffic message to the The optical flow switch.

In yet another embodiment, the intelligent scheduling algorithm includes checking the priority of the conflicting traffic traffic to enable the high priority person to directly enter the optical traffic switch and to enable the low priority person to enter the front end buffer device. For buffering.

The intelligent scheduling algorithm further includes checking the level length of the traffic signal when the priority of the traffic message is the same, so that the traffic with a higher level has a higher priority, and the priority buffer is preferentially obtained from the front buffer. The device enters the optical traffic switch, and the traffic with a small level continues to enter the front-end buffer device for buffer processing.

The intelligent scheduling algorithm further includes checking the time schedule when the level of the traffic signal is the same, so that the traffic FIFO that first enters the FIFO schedule is preferentially processed according to the FIFO of the time axis.

The intelligent scheduling algorithm is further included in the traffic message entering the FIFO. During scheduling, the priority of the traffic message in the FIFO schedule is increased at regular intervals.

In still another embodiment, the central intelligent scheduling controller pre-establishes the virtual optical path to control the optical optical switch to perform the virtual optical circuit switching through a time switch mechanism.

In still another embodiment, the optical traffic switch receives the traffic information transmitted by the front-end buffer device, and performs the exchange and transmission of the traffic information according to the optical switching path preset by the central intelligent scheduling controller. .

The invention provides a system design including a programmable optical flow switch, and cooperates with a smart scheduling mechanism technology to perform central intelligent scheduling control on the front-end buffer device, and the most appropriate traffic flow is intelligently scheduled. Under the mechanism, it is sent to the optical traffic switch for optical switching transmission. Therefore, under the design of this system, with the intelligent scheduling mechanism, the number of exchangeable switches of the programmable optical traffic switch can be reduced, but the total exchange amount is larger than the original one. The optical switch has been further increased. In summary, in the research of optical flow switches, no one has proposed the design of a programmable optical flow switch, and through the optical flow switch and the management of the intelligent scheduling mechanism, whether in the number of exchanges, or the overall system Significant progress has been made in the increase in the total amount of exchange, which can further achieve the ultimate goal of green energy reduction.

1‧‧‧ Optical switching system for data center networks

10‧‧‧ front-end buffer device

11‧‧‧Central Intelligent Scheduling Controller

12‧‧‧ Optical Flow Switch

20‧‧‧n*2n network switch

22‧‧‧2n*2n optical flow switch

100‧‧‧Server group

S41~S45‧‧‧ Process

1 is a schematic system architecture of an optical switching system applied to a data center network according to the present invention; FIGS. 2A and 2B are diagrams showing a core optical traffic switch using 128*128 and a core optical traffic switch of a conventional 256*256 according to the present invention; Schematic diagram Figure 3 is a comparison diagram of the total amount of exchanges of the overall optical flow switches of the optical switching system of the present invention under different path numbers; and Figure 4 is an optical switching system for the data center network of the present invention. The detection process of the intelligent scheduling algorithm.

The technical contents of the present invention are described below by way of specific embodiments, and those skilled in the art can easily understand the advantages and effects of the present invention from the contents disclosed in the present specification. The invention may be embodied or applied by other different embodiments.

The present invention is designed for use in a data center network including a programmable optical flow switch, mainly using a programmable optical flow switch applied to a data center, utilizing intelligent scheduling mechanism technology and a programmable optical flow switch. The system design makes the front-end buffer device, the optical flow switch, and the central intelligent scheduling controller form an optical switching system.

Please refer to FIG. 1, which shows a schematic system architecture of an optical switching system for a data center network of the present invention. As shown, an optical switching system 1 for a data center network of the present invention includes a front end buffer device 10, a central intelligent scheduling controller 11, and an optical flow switch 12.

The front-end buffer device 10 receives the traffic information from a server group 100. Since the present invention is applied to the optical switching system, the traffic information refers to the optical traffic signal, but is not limited thereto.

The central intelligent scheduling controller 11 is connected to the front end buffer device 10, and the central intelligent scheduling controller 11 is based on the front end buffer device 10 When the received traffic message determines that the traffic message has a conflict condition, the intelligent scheduling algorithm is started to control the operation of the front-end buffer device 10 and establish a virtual light path.

The optical flow switch 12 is connected to the central intelligent scheduling controller 11 and the front end buffer device 10, and the optical flow switch 12 performs virtual optical circuit switching based on the virtual optical path according to the control of the central intelligent scheduling controller 11. In order to achieve the rapid exchange of the traffic.

In one embodiment, the front end buffer device 10 of the present invention may be a 2n*n programmable L2 network switch, and corresponding to the design of the front end buffer device 10, the optical flow switch 12 may be n*n The core optical flow switch.

In another embodiment, when the central intelligent scheduling controller 11 determines that the traffic signal does not have a conflict condition, the pass-through command is transmitted to the front-end buffer device 10, so that the front-end buffer device 10 directly directs the traffic signal. Passed to the optical flow switch 12.

Specifically, the front-end buffer device 10 is controlled by a central intelligent scheduling mechanism based on SDN (Software Defined Networking). If there is no conflict in the input traffic, the central intelligent scheduling controller 11 performs pass-through. The instruction is sent to the front-end buffer device 10, so that the input traffic can be directly passed to the optical flow switch 12. If the incoming traffic has a conflict, the number of input ports may not be enough. When multiple input traffic messages are used, or when there are more than two traffic messages in the same instant to the same output port, when the above situation occurs, traffic traffic conflicts will be generated. This condition should be determined by the central intelligent scheduling controller 11 To control, if a conflict occurs, the central intelligent scheduling controller 11 activates the scheduling algorithm to control the conflicting traffic traffic.

The intelligent scheduling algorithm in the central intelligent scheduling controller can provide the traffic traffic priority order judgment and issue the control command to the front-end buffer device 10 for generating conflicting traffic signals to control the front-end buffer device. 10 operation.

The intelligent scheduling algorithm may include checking the priority of the conflicting traffic traffic so that the high priority person directly enters the optical traffic switch and the low priority person enters the front end buffer device for buffering.

When the priority of the traffic message is the same, the level of the traffic message is further checked to make the traffic of the level of traffic have a higher priority, and the optical traffic switch is preferentially accessed from the front-end buffer device. The traffic with a small level continues to enter the front-end buffer device for buffering.

When the level of the traffic traffic is the same, the time schedule is checked, and according to the FIFO of the time axis, the traffic traffic that first enters the FIFO schedule is prioritized. In addition, the intelligent scheduling algorithm increases the priority of the traffic message in the FIFO schedule at intervals when the traffic message enters the FIFO schedule.

The judgment and control of the intelligent scheduling algorithm will be detailed later.

In an embodiment, the central intelligent scheduling controller 11 pre-establishes the virtual optical path to control the optical optical switch to perform the virtual optical circuit switching through a time switch mechanism. Specifically, the central intelligent scheduling controller 11 It is a centralized smart controller with a central controller and SDN-capable smart controller. In this system, the central intelligent scheduling controller 11 and the front-end buffer device 10 and the optical flow switch respectively 12, etc., depending on whether the traffic conflict situation occurs, to start the intelligent scheduling algorithm, using the four scheduling mechanisms of the intelligent scheduling algorithm to control the operation of the front-end buffer device 10, and then, the central intelligent scheduling The controller 11 then establishes a virtual optical path to control the optical flow switch 12 to perform virtual optical circuit switching, thereby achieving the purpose of fast optical communication exchange.

In an embodiment, the optical traffic switch 12 receives the traffic information transmitted by the front-end buffer device 10, and performs the exchange and transmission of the traffic information according to the optical switching path preset by the central intelligent scheduling controller 11. . Specifically, the optical flow switch 12 can be an all-optical flow switch, and its control surface is controlled by the central intelligent scheduling controller 11, that is, the central intelligent scheduling controller 11 notifies the light. How the traffic switch 12 performs the exchange and transmission of optical optical services.

The central intelligent scheduling controller 11 pre-establishes a virtual light path to control and schedule the optical flow switch 12 for virtual circuit switching, thereby achieving the task and purpose of fast optical communication exchange. The central intelligent scheduling controller 11 also utilizes an intelligent scheduling mechanism to increase the total amount of exchanges (Throughput) of the system. The front end of the optical flow switch 12 is connected to the front end buffer device 10. When the current end buffer device 10 sends out traffic traffic (such as optical traffic), the optical flow switch 12 follows the preset light of the central intelligent scheduling controller 11. The path is exchanged for the exchange and transmission of the optical information.

As can be seen from the above, the present invention is an optical switching system applied to a data center network, which is mainly applied to a data center by using a programmable optical flow switch, and utilizes a smart scheduling mechanism technology and a programmable optical flow switch. The system design allows the number of exchangeable ports of the programmable optical optical switch to be reduced to half the number of switching ports (such as 128) compared to the original optical switch (such as 256), but the total amount of switching of the overall optical traffic switch Compared with the original optical switch from the original 50% to 60%, in addition, if the number of exchanges reduced to 3 / 4 exchanges (such as 192), the total amount of exchange is further increased from the original 50% to 99%.

Please refer to FIG. 2A and FIG. 2B, which are schematic diagrams showing the architecture of a 128*128 core optical traffic switch and a traditional 256*256 core optical traffic switch according to the present invention. FIG. 2A is a conventional 256*256 core light. The architecture diagram of the traffic switch, wherein the traditional system uses a 2n*2n optical traffic switch 22 with a 2n*2n network switch 20. In addition, FIG. 2B is an architectural diagram of a core optical traffic switch using 128*128 in the present invention, wherein In the present invention, the n*n optical flow switch 12 is used with the 2n*n front end buffer device 10.

Please refer to FIGS. 2A and 2B at the same time, the system design proposed by the present invention cooperates with the smart scheduling mechanism technology in the central intelligent scheduling controller 11 in the front-end buffer device 10 (for example, a programmable L2 network switch). The control of the SDN-based intelligent scheduling mechanism is performed, and the most appropriate traffic traffic is sent to the optical traffic switch 12 for optical switching transmission through the intelligent scheduling mechanism. In the system of the present invention, under the control of the intelligent scheduling mechanism, the original 2n*2n optical flow switch 22 of 256*256 is required, and now It is replaced by only 128*128 core optical traffic switch 12, so that the number of exchanges of the original optical traffic switch can be reduced by 50%, but the total exchange volume of the overall optical traffic switch can be 50% of the total exchange amount. Increase the total amount of exchange to 60%, which is 20% more than the original optical switch, as shown in Figure 3, in addition, if the number of exchanges is reduced to 3/4 of the number of exchanges (such as 192 * 192 When the total amount of exchange is further increased from the original 50% to 99%, it is nearly double the exchange total performance compared with the traditional 2n*2n optical flow switch 22, as shown in Figure 3.

As can be seen from the above, the present invention proposes an optical switching system including a programmable optical flow switch, and with intelligent scheduling mechanism technology, the front-end buffer device can be controlled by an intelligent scheduling mechanism, and the most appropriate traffic signal can be passed. Under the intelligent scheduling mechanism, the optical traffic switch is sent to the optical traffic switch for optical switching transmission. Under the present invention, the number of exchangeable optical traffic switches can be significantly reduced compared with the original optical traffic switch, but the overall optical traffic is reduced. The total amount of exchanges of switches has increased significantly compared to the original optical switches.

The intelligent scheduling algorithm on the central intelligent scheduling controller includes four scheduling mechanisms. The first one is to check the priority of the conflicting traffic, and the priority is passed first, and the optical traffic is directly entered. The switch, the low priority traffic enters the front-end buffer device for buffer processing. If the same priority is given, the second check schedule is performed, that is, the level of the traffic level is determined. The traffic with a large traffic level has a higher priority and can be preferentially accessed from the front-end buffer device. The optical traffic switch, on the other hand, the traffic with a shorter traffic level continues to enter the front-end buffer device for buffer processing. If the conflicting traffic is at the same level of the chief of affairs Degree, if it has the same priority, it is necessary to carry out the third inspection schedule, that is, to determine the timeline FIFO, at this time, it is to enter the FIFO schedule, according to the time first-come first processing. Finally, the fourth schedule is when the time FIFO schedule is used. When the traffic enters the FIFO schedule, the priority of the FIFO is increased at intervals to avoid the starvation of the traffic.

The central intelligent scheduling controller starts the scheduling algorithm on it as follows: Algorithm:Intelligent Scheduler while(true)do{/* do forever */ receives all input flows in a period of flow detection time; The received flow is added to the multi-level FIFO queue according to its priority; in the multi-level FIFO queue, the highest priority flow is found; if the highest priority flow number=1, the found flow is switched to the output output; if priority The highest flow number is >1, and the flow with the largest level_length is found out; if the maximum flow number of level_length=1, the flow found is switched to the output output; if the maximum flow number of level_length is >1, the arrival time is found out from it. The earliest flow; exchange the found flow to the output 埠 output; Other unoutputted flows enter the optical buffer delay output; periodically increase the priority of other unoutput flows; }end while

Please refer to FIG. 4, which shows the detection process of the intelligent scheduling algorithm in the optical switching system applied to the data center network of the present invention. As shown, in flow S41, all incoming traffic messages are received. In the process S42, the priority is determined. When the number of the highest priority traffic is greater than 1, the process proceeds to the process S43. Otherwise, if there is only one, the process proceeds to the process S45, that is, the traffic is output. Traffic traffic. In the process S43, the length of the level is determined, and when the number of the traffic services with the largest length is greater than 1, the process proceeds to the process S44. Otherwise, if there is only one, the process proceeds to the process S45, that is, the traffic message is output. Traffic traffic. In the process S44, that is, the traffic traffic arrival time, and find the earliest traffic traffic, that is, the traffic traffic to be output.

In the process S45, the flow finds the traffic and exchanges it to the output, and the other unoutputted traffic enters the optical buffer delay output, and periodically increases the priority of other unoutput traffic. In other words, even if the traffic traffic that cannot be output will gradually increase its priority, it will prevent the starvation of the traffic.

The invention is applied to an optical switching system on a data center network, and is applied to a data center through a programmable optical flow switch, and is matched with a smart scheduling mechanism technology to complete an innovative optical switching system. this invention Compared with other conventional technologies, it has the following two advantages.

First, the system is under the control of the central intelligent scheduling mechanism. The original optical flow switch that originally required 2n*2n (such as 256*256) can now use only the n*n (such as 128*128) core optical flow switch. Instead, this can reduce the number of exchanges compared to the original optical switch by 50% ((2n-n)/2n * 100%), but the total exchange volume of the overall optical flow switch has improved from the original 50% to 60%. The original optical switch increases the total switching performance by 20%. In addition, if you replace the core optical traffic switch with the number of switched ports of the original 3/4 (such as 192*192), you can reduce the number of switching ports compared to the original optical switch by 25% ((256-192) /256 * 100%), but the total exchange volume of the overall optical traffic switch has increased from the original 50% to 99%, which is nearly double the total switching performance of the original optical switch.

Second, the present invention proposes a traffic scheduling mechanism that can enhance the front-end buffer device of the optical traffic switch. Currently, the front-end buffer of the optical traffic switch does not support the intelligent scheduling mechanism. The intelligent scheduling algorithm proposed by the invention includes four scheduling mechanisms. The first one is to check the priority of the conflicting traffic, the priority of the high priority is passed, and the optical traffic switch is directly accessed, and the low priority traffic is used. Then enter the front-end buffer device for buffer processing. If the same priority is given, the second check schedule is performed, that is, considering the length of the traffic level, the traffic with a large traffic level has a higher priority, and the optical traffic switch can be preferentially accessed from the front-end buffer device, otherwise If it is a short message, it will continue to enter the front-end buffer device for buffer processing. If it is the same traffic level of the traffic length, it has the same priority, then the third check schedule, join the timeline FIFO, then enter FIFO scheduling, processing first in a timely manner. Finally, the fourth schedule is the time FIFO schedule. When the traffic enters the FIFO schedule, it increases its priority in the FIFO at regular intervals to avoid starvation of the traffic.

The detailed description of the present invention is intended to be illustrative of a preferred embodiment of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

Claims (9)

An optical switching system for a data center network, comprising: a front-end buffer device for receiving traffic traffic from a server group; and a central intelligent scheduling controller connected to the front-end buffer device for The traffic signal received by the front-end buffer device determines whether the traffic signal has a conflict condition, so as to determine that the traffic signal has a conflict condition, start an intelligent scheduling algorithm to control the operation of the front-end buffer device. And establishing a virtual light path; and an optical flow switch connecting the central intelligent scheduling controller and the front-end buffer device for establishing, according to the central intelligent scheduling controller, using the central intelligent scheduling controller The virtual optical path performs virtual optical circuit switching to achieve fast switching of the traffic information, wherein the central intelligent scheduling controller determines that the traffic signal does not have a conflict condition, and transmits a through command to the front end buffer device. So that the front-end buffer device directly transmits the traffic signal to the optical traffic switch. The optical switching system of claim 1, wherein the central intelligent scheduling controller pre-establishes the virtual optical path to control the optical optical switch to perform the virtual optical circuit switching through a time switch mechanism. The optical switching system of claim 1, wherein the optical traffic switch receives the traffic information transmitted by the front-end buffer device, and performs the optical switching path preset according to the central intelligent scheduling controller. The exchange and transmission of the traffic. An optical switching system for a data center network, comprising: a front-end buffer device for receiving traffic traffic from a server group; and a central intelligent scheduling controller connected to the front-end buffer device for The traffic signal received by the front-end buffer device determines whether the traffic signal has a conflict condition, so as to determine that the traffic signal has a conflict condition, start an intelligent scheduling algorithm to control the operation of the front-end buffer device. And establishing a virtual light path; and an optical flow switch connecting the central intelligent scheduling controller and the front-end buffer device for establishing, according to the central intelligent scheduling controller, using the central intelligent scheduling controller The virtual optical path performs virtual optical circuit switching to achieve fast switching of the traffic, wherein the front-end buffer device is a 2n*n programmable L2 network switch. The optical switching system of claim 4, wherein the optical traffic switch is a n*n core optical traffic switch. An optical switching system for a data center network, comprising: a front-end buffer device for receiving traffic traffic from a server group; and a central intelligent scheduling controller connected to the front-end buffer device for The traffic signal received by the front-end buffer device determines whether the traffic signal has a conflict condition, so as to determine that the traffic signal has a conflict condition, start an intelligent scheduling algorithm to control the operation of the front-end buffer device. And establishing a virtual light path; and an optical flow switch connecting the central intelligent scheduling controller and the front-end buffer device for establishing, according to the central intelligent scheduling controller, using the central intelligent scheduling controller The virtual optical path performs virtual optical circuit switching to achieve fast switching of the traffic information, wherein the intelligent scheduling algorithm includes checking the priority of the conflicting traffic traffic, so that the high priority person directly enters the The optical traffic switch, and the low priority person enters the front end buffer device for buffer processing. The optical switching system of claim 6, wherein the intelligent scheduling algorithm further includes checking the level length of the traffic signal when the priority of the traffic message is the same, so that the traffic of the level is large. The traffic has a higher priority, and the traffic from the front-end buffer device is preferentially entered into the optical traffic switch, so that the traffic with a small level continues to enter the front-end buffer device for buffer processing. The optical switching system of claim 7, wherein the intelligent scheduling algorithm further includes checking the time schedule when the level of the traffic signal is the same, so that the FIFO according to the time axis will enter first. The traffic of the FIFO schedule is prioritized. The optical switching system of claim 8, wherein the intelligent scheduling algorithm further comprises: when the traffic message enters the FIFO schedule, the traffic message is scheduled in the FIFO at intervals The priority has increased.