CN110809202A - Passive optical distribution node and electro-optical hybrid double-layer access network - Google Patents
Passive optical distribution node and electro-optical hybrid double-layer access network Download PDFInfo
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Abstract
According to the invention, a passive optical distribution node is constructed, a plurality of servers connected to the same passive optical distribution node form a calculation cluster, and the calculation cluster is used as a basic unit to form a data center electro-optical hybrid double-layer access network, so that the network access function of the servers in the data center is realized. Flow convergence of m servers in 1 computing cluster is realized through the passive optical distribution nodes, and high link utilization rate of a connection link of a passive optical distribution node convergence exchange interface and an inter-cluster switch exchange interface is realized; the computing cluster can realize the direct communication of the servers in the cluster through the intra-cluster channel without forwarding by the electric switching equipment, thereby reducing the forwarding time delay of data communication between clusters; the network can greatly reduce the number of the electric switching equipment of the access layer network, reduce the power consumption of the network and simplify the complexity of the layout and the wiring of the upper layer network; meanwhile, the tunable transceiver is configured for the double transceiving network interface card of the server, and the network bandwidth can be flexibly configured according to the real-time network load.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to a passive optical distribution node and an electro-optical hybrid double-layer access network formed by the passive optical distribution node.
Background
The traditional data center network structure is an access-aggregation-core three-layer network architecture mainly oriented to client-server service, and is suitable for a traffic model mainly based on north-south traffic. With the rise of various cloud computing services, cloud computing centers are deployed in a large scale, and by the forecast of cisco companies, the cloud data centers process 94% of workload and computing examples in 2021, and the traditional data centers only account for 6%. Meanwhile, as the cloud computing service needs to exchange a large amount of data among the servers in the data center, the flow rate of the data center is greatly increased from east to west and becomes the main body of the data center flow rate, and the data center flow rate accounts for 71.5% of the whole data center flow rate by 2021 years. The traditional three-layer network architecture cannot provide sufficient network bandwidth for east-west, and when a new traffic model for a cloud data center is oriented, a traffic bottleneck problem can be generated between a convergence layer and a core layer, so that the cloud data center network architecture mostly adopts a 'spin-leaf' two-layer network architecture based on a CLOS (client/server) structure, a spin switch and a leaf switch are connected in a full-mesh manner, and the architecture can provide a high-bandwidth approximate non-blocking network for the data center. However, according to the Facebook report on the flow rate of the cloud computing data center, the 1-minute link utilization rate of the access layer is extremely low, the 99% link load is less than 10%, and the data reflects that the link utilization rate of the access layer of the data center can be improved through further network structure design, so that the number of electric exchange equipment of the access layer is reduced, and the network utilization rate is improved.
On the other hand, currently, a data center access layer network is implemented by a top-of-rack switch, that is, all servers in a rack are connected to the top-of-rack switch (generally, a single rack has 40 servers), so as to implement a network access function. Data communication between servers in the rack needs the top-of-rack switch to forward, direct communication cannot be realized, and a large amount of switching bandwidth of the top-of-rack switch is occupied. According to the report of the Facebook on the flow research of the cloud computing data center, the network load generated by the data exchange in the rack accounts for about 12.9% of the network load of the whole data center. A direct communication network among servers in the rack can be established by constructing the passive optical distribution nodes, and a plurality of servers form a computing cluster, so that the data communication efficiency in the rack is improved, and the network load of the top-of-rack switch is further reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows:
in order to solve the defects in the prior art, a passive optical distribution node and an electro-optical hybrid double-layer access network formed by the passive optical distribution node are provided.
The invention adopts the following technical scheme for solving the technical problems:
firstly, in order to achieve the above object, a passive optical distribution node is provided, including an optical coupler, an optical splitter, a first optical circulator, a second optical circulator, a first narrow band filter, and a second narrow band filter, where the optical coupler has m input ports and 1 output port, the optical splitter has 1 input port and m output ports, the first optical circulator and the second optical circulator respectively have respective first port, second port, and third port, the first narrow band filter and the second narrow band filter have respective first port and second port, reflect a preset wavelength optical signal, and transmit all remaining wavelength optical signals; the connection mode is as follows: the output port of the optical coupler is connected with the first port of the first optical circulator, the second port of the first optical circulator is connected with the first port of the first narrow-band filter, the third port of the first optical circulator is connected with the first port of the second optical circulator, the second port of the second optical circulator is connected with the first port of the second narrow-band filter, and the third port of the second optical circulator is connected with the input port of the optical splitter; the passive optical distribution node is provided with m edge input ports, m edge output ports, 1 convergence input port and 1 convergence output port; the m edge input ports are respectively connected with the m input ports of the optical coupler, the m edge output ports are respectively connected with the m output ports of the optical splitter, the convergence input port is connected with the second port of the second narrow-band filter, and the convergence output port is connected with the second port of the first narrow-band filter; the m edge input ports and the corresponding m edge output ports form m edge switching interfaces, and the convergence input ports and the convergence output ports form 1 convergence switching interface.
Secondly, in order to achieve the purpose, an electro-optical hybrid double-layer access network is also provided, which comprises 1 inter-cluster switch, wherein the inter-cluster switch can realize the exchange of computing inter-cluster data, k passive optical distribution nodes and k multiplied by m servers through a storage-forwarding mechanism; the inter-cluster switch is provided with k switching interfaces, input ports and output ports of the switching interfaces are respectively connected with the convergence switching interfaces of k passive optical distribution nodes, k multiplied by m servers are divided into k groups, and m servers in each group are respectively connected with m edge switching interfaces of 1 passive optical distribution node through the input ports and the output ports of respective network interface cards; all servers connected to the same passive optical distribution node form 1 computing cluster, wherein preset wavelengths of a first narrow-band filter and a second narrow-band filter of the passive optical distribution node are set as intra-cluster channel wavelengths, intra-cluster data exchange is carried out between the servers in the computing cluster through the passive optical distribution node by using intra-cluster channels, and inter-cluster data exchange is realized between the servers in different computing clusters through the passive optical distribution node and an inter-cluster switch by using uplink channels and downlink channels.
Further, the switching interface of the inter-cluster switch includes a switching interface control unit, a switching interface electrical buffer, a fixed wavelength transceiver array, a switching interface multiplexer, and a switching interface demultiplexer, wherein the fixed wavelength transceiver array includes n fixed wavelength transceivers, each fixed wavelength transceiver has an optical transmitting port, an optical receiving port, an electrical transmitting port, and an electrical receiving port, and n optical transmitting ports of the n fixed wavelength transceivers use λ respectivelyd1To lambdadnλ is used for n optical receiving ports of n fixed wavelength transceivers with n wavelengthsu1To lambdaunN wavelengths in total, λd1To lambdadnAnd λu1To lambdaunThe switching interface multiplexer is provided with n input ports and 1 output port, and the switching interface demultiplexer is provided with 1 input port and n output ports; n optical transmission ports of n fixed wavelength transceivers in the fixed wavelength transceiver array are respectively connected with n input ports of the switching interface multiplexer, and the fixed wavelength transceiversN optical receiving ports of n fixed wavelength transceivers in the array are respectively connected with n output ports of the switching interface demultiplexer, n electric transmitting ports and n electric receiving ports of the n fixed wavelength transceivers in the fixed wavelength transceiver array are connected with the switching interface electric buffer memory, an output port of the switching interface multiplexer is connected with an output port of the inter-cluster switch switching interface, an input port of the switching interface demultiplexer is connected with an input port of the inter-cluster switch switching interface, and the inter-cluster switch switching interface realizes the dispatching of transmitting and receiving of data messages in the switching interface electric buffer memory through the switching interface control unit.
Furthermore, the network interface card is a dual-transceiving network interface card, and comprises an interface card control unit, an interface card electrical cache, a tunable transceiver, an interface card fixed wavelength transceiver, an interface card multiplexer, and an interface card demultiplexer, wherein the tunable transceiver and the interface card fixed wavelength transceiver respectively have an optical transmitting port, an optical receiving port, an electrical transmitting port, and an electrical receiving port, and the optical transmitting port of the tunable transceiver can be at λu1To lambdaunTuned in a total of n wavelengths, and written as lambdau1To lambdaunN wavelengths in total are the wavelength set ΛuThe optical receiving port of the tunable transceiver may be at λd1To lambdadnTuned in a total of n wavelengths, and written as lambdau1To lambdaunN wavelengths in total are the wavelength set ΛdThe optical transmitting port and the optical receiving port of the interface card fixed wavelength transceiver both use the preset wavelength lambdac，λcThe wavelength is located in the wave band for optical fiber communication, the wavelength is located between 400nm and 2500nm, the interface card multiplexer is provided with 2 input ports and 1 output port, and the interface card demultiplexer is provided with 1 input port and 2 output ports;
the optical sending ports of the tunable transceiver and the interface card fixed wavelength transceiver are respectively connected with 2 input ports of the interface card multiplexer, 2 optical receiving ports of the tunable transceiver and the interface card fixed wavelength transceiver are respectively connected with 2 output ports of the interface card demultiplexer, the respective electric sending ports and electric receiving ports of the tunable transceiver and the interface card fixed wavelength transceiver are respectively connected with an interface card electric cache, the output port of the interface card multiplexer is connected with the output port of the dual-sending network interface card, the input port of the interface card demultiplexer is connected with the input port of the dual-sending network interface card, the dual-sending network interface card schedules the sending and the receiving of data messages in the interface card electric cache through a control unit, and simultaneously controls the output and the input wavelengths of the optical sending port and the optical receiving port of the tunable transceiver.
Still further, the set of wavelengths ΛuThe wavelength set Lambda is used for uplink data transmission from a server to an inter-cluster switch for a network uplink channeldFor network downlink channel for downlink data transmission from inter-cluster switch to server, said wavelength λcThe channel in the network cluster is used for calculating data transmission among all servers in the cluster;
the exchange interface control unit of each exchange interface of the inter-cluster exchanger and the interface card control unit of the dual-transceiving network interface card of each server use an uplink channel and a downlink channel to transmit control signaling, and can use an optical access network typical scheduling algorithm-a multipoint access control protocol (MPCP) to realize a scheduling algorithm of inter-cluster exchange, thereby completing the configuration of uplink data transmission time slots of the dual-transceiving network interface cards of each server and the tuning of an optical receiving port and an optical transmitting port of a tunable transceiver, and realizing a medium access control function.
When data exchange is carried out between all servers in the cluster through the cluster channel, a bus type medium access control algorithm including but not limited to CSMA/CD, token ring and the like is adopted to share the cluster channel bandwidth.
Further, when the number of wavelengths n is less than the number of servers m in each group, the interface card control unit of the network interface card controls the tunable transceiver, tunes the wavelengths of the optical transmitting port and the optical receiving port, balances the network load carried by each wavelength channel, and improves the network utilization efficiency.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
the invention is different from the prior art that the access layer of the data center is directly connected with a server to realize network access by taking a commercial Ethernet switch as a top switch, and the invention forms a computing cluster by constructing a passive optical distribution node and forming a data center electro-optical hybrid double-layer access network by taking the computing cluster as a basic unit to realize the network access function of the server in the data center.
1. When the existing data center access layer is directly connected with a server to realize network access by taking a commercial Ethernet switch as a top rack switch, only 1 switching interface (port) of the top rack switch realizes the network access of 1 server, and 1 switching interface of an inter-cluster switch in the data center electro-optical hybrid double-layer access network can realize the network access of 1 computing cluster (m servers) through a passive optical distribution node. The data center electro-optical hybrid double-layer access network realizes the flow convergence of m servers in 1 computing cluster through the passive optical distribution nodes, and realizes the high link utilization rate of the connection link of the passive optical distribution node convergence exchange interface and the inter-cluster switch exchange interface. Compared with the existing access mode under the condition of the same network load, the electro-optical hybrid double-layer access network of the data center improves the utilization rate of the link between the server and the electric switching equipment (the existing access network: a top switch, the electro-optical hybrid double-layer access network of the data center: an inter-cluster switch), and realizes the high-efficiency utilization of the access link of the data center.
2. In the data center electro-optical hybrid double-layer access network, a plurality of servers connected to the same passive optical distribution node form a computing cluster, direct communication of the servers in the same computing cluster can be realized through intra-cluster channels, forwarding of electric switching equipment (inter-cluster switches) is not needed, and forwarding time delay of inter-cluster data communication is reduced. Meanwhile, a computing cluster is constructed through the passive optical distribution nodes, so that the intra-cluster flow is directly exchanged through an intra-cluster channel, the network load of an inter-cluster exchanger is reduced, the network throughput of inter-cluster data exchange is improved, and the network delay can be reduced.
3. The electro-optical hybrid double-layer access network of the data center can greatly reduce the number of the electric switching devices of the access layer network. In the following, an example is given in which 256000 server-scale data centers are accessed, and the number of access interfaces of the electrical access equipment is set to 40 for analysis. The scheme of realizing network access by directly connecting a commercial Ethernet switch serving as a top-rack switch with a server needs to use 6400 top-rack switches, and after a computing cluster (m is 16) with the scale of 16 servers is constructed by passive optical distribution nodes, the data center electro-optical hybrid double-layer access network only needs 400 inter-cluster switches. Generally, the number of the electric switching devices (inter-cluster switches) of the data center electro-optical hybrid dual-layer access network is 1/m of that of the existing scheme for realizing network access by directly connecting commercial Ethernet switches serving as top-of-rack switches and servers. The main source of the power consumption of the data center network is the electric switching equipment, and the electro-optical hybrid double-layer access network of the data center greatly reduces the network power consumption by reducing the number of the electric switching equipment. Meanwhile, the reduction of the number of the electric switching devices also simplifies the complexity of the layout and the wiring of an upper network of the access network.
4. The tunable transceiver in the dual transceiving network interface card enables the uplink channel and the downlink channel of the access network to flexibly configure the network bandwidth according to the real-time network load. Typically, the wavelength set Λ used by the upstream channeluWavelength set Λ for use with downlink channelsdThe number n of the wavelengths in the cluster is smaller than the number m of the servers in the computing cluster, so that a plurality of servers need to share the same uplink wavelength channel or downlink wavelength channel. The control unit in the dual-transceiving network interface card can control the tunable transceiver, tune the wavelengths of the optical transmitting port and the optical receiving port, and balance the network load borne by each wavelength channel, specifically, a small number of servers with high network load share the same wavelength channel and a plurality of servers with low network load share the same wavelength channel.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a passive optical distribution node according to the present invention;
fig. 2 is a schematic structural diagram of a data center electro-optical hybrid two-layer access network according to the present invention;
FIG. 3 is a schematic diagram of the structure of a switching interface of an inter-cluster switch according to the present invention;
fig. 4 is a schematic diagram of a dual transceiving network interface card according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 1 is a schematic structural diagram of a passive optical distribution node according to the present invention, including an optical coupler, an optical splitter, a first optical circulator, a second optical circulator, a first narrowband filter, and a second narrowband filter, where the optical coupler has m input ports and 1 output port, the optical splitter has 1 input port and m output ports, the first optical circulator and the second optical circulator respectively have respective first port, second port, and third port, the first narrowband filter and the second narrowband filter have respective first port and second port, reflect only channel wavelength λ c in a cluster, and transmit all remaining wavelength optical signals; the connection mode is as follows: the output port of the optical coupler is connected with the first port of the first optical circulator, the second port of the first optical circulator is connected with the first port of the first narrow-band filter, the third port of the first optical circulator is connected with the first port of the second optical circulator, the second port of the second optical circulator is connected with the first port of the second narrow-band filter, and the third port of the second optical circulator is connected with the input port of the optical splitter; the passive optical distribution node is provided with m edge input ports, m edge output ports, 1 convergence input port and 1 convergence output port; the m edge input ports are respectively connected with the m input ports of the optical coupler, the m edge output ports are respectively connected with the m output ports of the optical splitter, the convergence input port is connected with the second port of the second narrow-band filter, and the convergence output port is connected with the second port of the first narrow-band filter; the m edge input ports and the corresponding m edge output ports form m edge switching interfaces, and the convergence input ports and the convergence output ports form 1 convergence switching interface.
When the passive optical distribution node operates, an optical signal output by the optical coupler enters a first port of the first optical circulator and is transmitted to a second port of the first optical circulator, the optical signal passes through the first narrow-band filter, an optical signal with an Λ u wavelength passes through the first narrow-band filter and enters the convergence output port, a wavelength c optical signal is reflected to enter the second port of the first optical circulator to complete demultiplexing, a wavelength c optical signal is transmitted to a third port of the first optical circulator and then enters the first port of the second optical circulator and is transmitted to the second port of the second optical circulator, the wavelength c optical signal is reflected to the second narrow-band filter and is combined with an wavelength d optical signal input through the convergence input port to complete wavelength division multiplexing, the wavelength division multiplexing optical signals return to the second port of the second optical circulator together, and the wavelength optical signal is transmitted to the third port of the second optical circulator and is input to the optical splitter.
Referring to fig. 2, the passive optical distribution nodes can construct a data center electro-optical hybrid dual-layer access network, which includes 1 inter-cluster switch that implements inter-cluster data exchange, k passive optical distribution nodes and k × m servers through a "store-forward" mechanism; the inter-cluster switch is provided with k switching interfaces which are respectively connected with the convergence switching interfaces of k passive optical distribution nodes, k multiplied by m servers are divided into k groups, and m servers in each group are respectively connected with m output ports and input ports of 1 passive optical distribution node through the input port and the output port of each double transceiving network interface card; all servers connected to the same passive optical distribution node form 1 compute cluster.
Referring to fig. 3, the switching interface of the inter-cluster switch includes a control unit, an electrical buffer, a fixed wavelength transceiver array, a multiplexer, and a demultiplexer, wherein the fixed wavelength transceiver array is composed of n fixed wavelength transceivers having an optical transmitting port, an optical receiving port, an electrical transmitting port, an electrical receiving port, and n fixed wavelength transceiversThe n optical transmission ports of the fixed-wavelength transceiver use lambda respectivelyd1To lambdadnλ is used for n optical receiving ports of n fixed wavelength transceivers with n wavelengthsu1To lambdaunN wavelengths in total, λd1To lambdadnAnd λu1To lambdaunThe optical fiber communication optical multiplexer is positioned in a wave band for optical fiber communication, the wavelength is between 400nm and 2500nm, the multiplexer is provided with n input ports and 1 output port, and the demultiplexer is provided with 1 input port and n output ports;
n optical transmission ports of n fixed wavelength transceivers in the fixed wavelength transceiver array are respectively connected with n input ports of the multiplexer, n optical receiving ports of n fixed wavelength transceivers in the fixed wavelength transceiver array are respectively connected with n output ports of the demultiplexer, n electrical transmission ports and n electrical receiving ports of n fixed wavelength transceivers in the fixed wavelength transceiver array are both connected with the electrical cache, an output port of the multiplexer is connected with an output port of the inter-cluster switch exchange interface, an input port of the demultiplexer is connected with an input port of the inter-cluster switch exchange interface, and the inter-cluster switch exchange interface realizes the scheduling of the transmission and the reception of data messages in the electrical cache through the control unit.
Referring to fig. 4, the dual transceiving network interface card includes a control unit, an electrical buffer, a tunable transceiver, a fixed wavelength transceiver, a multiplexer, and a demultiplexer, wherein the tunable transceiver and the fixed wavelength transceiver each have a respective optical transmitting port, an optical receiving port, an electrical transmitting port, and an electrical receiving port, and the optical transmitting port of the tunable transceiver can be at λu1To lambdaunTuned in a total of n wavelengths, and written as lambdau1To lambdaunN wavelengths in total are the wavelength set ΛuThe optical receiving port of the tunable transceiver may be at λd1To lambdadnTuned in a total of n wavelengths, and written as lambdau1To lambdaunN wavelengths in total are the wavelength set Λdλ is used for both the optical transmitting port and the optical receiving port of the fixed wavelength transceivercWavelength, λcWavelength is in the optical fiber communication waveband, the wavelength is between 400nm and 2500nm, the multiplexer has 2 input ports and 1 output port, the demultiplexerHaving 1 input port and 2 output ports;
the optical sending ports of the tunable transceiver and the fixed wavelength transceiver are respectively connected with 2 input ports of the multiplexer, 2 optical receiving ports of the tunable transceiver and the fixed wavelength transceiver are respectively connected with 2 output ports of the demultiplexer, the respective electrical sending ports and electrical receiving ports of the tunable transceiver and the fixed wavelength transceiver are respectively connected with the electrical cache, the output port of the multiplexer is connected with the output port of the dual-transceiving network interface card, the input port of the demultiplexer is connected with the input port of the dual-transceiving network interface card, the dual-transceiving network interface card schedules the sending and the receiving of data messages in the electrical cache through the control unit, and simultaneously controls the output and the input wavelengths of the optical sending port and the optical receiving port of the tunable transceiver.
When the number of wavelengths n is less than the number of servers m in each group, the interface card control unit of the network interface card controls the tunable transceiver, tunes the wavelengths of the optical transmitting port and the optical receiving port, and balances the network load carried by each wavelength channel.
The wavelength set ΛuThe wavelength set Lambda is used for uplink data transmission from a server to an inter-cluster switch for a network uplink channeldFor network downlink channel for downlink data transmission from inter-cluster switch to server, said wavelength λcThe channel in the network cluster is used for calculating data transmission among all servers in the cluster;
the control unit of each interface of the inter-cluster switch and the control unit of the dual transceiving network interface card of each server use the uplink channel and the downlink channel to transmit control signaling, complete the uplink data transmission time slot configuration of the dual transceiving network interface card of each server and the tuning of the optical receiving port and the optical transmitting port of the tunable transceiver, realize the medium access control function, enable the bandwidth of the uplink channel and the downlink channel to be configured as required, and improve the network utilization efficiency; when data exchange is carried out between all servers in the cluster through the cluster channel, a bus type medium access control algorithm including but not limited to CSMA/CD, token ring and the like is adopted to share the cluster channel bandwidth.
An example of constructing a data center access network of 256000 server scales based on a data center electro-optical hybrid dual-layer access network is given below, meanwhile, 1 wavelength configuration scheme of 1 inter-cluster switch and a dual-transceiving network interface card of a server accessing the inter-cluster switch is given in the example, and a dynamic configuration process of 1 uplink channel and downlink channel bandwidth of each server in a computing cluster in a certain period of time is described:
referring to the structure of the passive optical distribution node in fig. 1 and the data center electro-optical hybrid dual-layer access network structure in fig. 2, if m is 16 and k is 40, each computing cluster includes 16 servers, and 1 inter-cluster switch connects 40 passive optical distribution nodes, thereby implementing the network access function of 640 servers. And further connecting 400 inter-cluster switches through an upper network (which can be a Spine-Leaf structure network), so that 256000 server-scale data centers can be accessed into the network.
Further, referring to the switching interface structure of the inter-cluster switch in fig. 3 and the dual transceiving network interface card structure in fig. 4, the wavelength set Λ for the uplink channel isuAllocating 2 wavelengths lambdau1And λu2For wavelength set Λ for downlink channelsdAllocating 2 wavelengths lambdad1And λd2If there are 2 fixed wavelength transceivers in the fixed wavelength transceiver array in the switching interface of the inter-cluster switch, the wavelengths of the optical output ports are λd1And λd2The wavelength of the optical input port is lambdau1And λu2The optical transmission port of the tunable transceiver in the dual-transceiving network interface card can be at wavelength lambdau1And λu2Intertunable, the optical receiving port being at wavelength λd1And λd2Inter-tuning, assigning wavelengths λ to channels in a clustercThe optical transmitting port and the optical receiving port of the fixed wavelength transceiver in the dual transmitting-receiving network interface card adopt the wavelength lambdac。
Assuming that 4 servers in 16 servers in a certain computing cluster are under heavy load and the rest 12 servers are under light load in a certain period of time, the 4 servers under heavy load control the tunable transceiver through the control unit of the dual transceiving network interface card to enable the optical transmitting port of the tunable transceiver to transmit lightTuned to wavelength lambdau1Optical receiving port tuned to wavelength lambdad1The 12 servers in light load control the tunable transceiver via the control unit of the dual transmitting-receiving network interface card to tune its optical transmission port to wavelength lambdau2Optical receiving port tuned to wavelength lambdad2. Through the tuning process, 4 servers under heavy load share 1 upstream wavelength channel bandwidth and 1 downstream wavelength channel bandwidth, and 12 servers under heavy load share 1 upstream wavelength channel bandwidth and 1 downstream wavelength channel bandwidth, so that the network load of each upstream wavelength channel and each downstream wavelength channel is balanced, the heavy-load servers can obtain more transmission bandwidths, the network delay is reduced, and the network throughput is improved. In particular, since the intra-cluster channel has only 1 wavelength λcAnd when data exchange is carried out between all servers in the cluster through the cluster channel, the CSMA/CD algorithm is adopted to share the cluster channel bandwidth.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A passive optical distribution node is characterized by comprising an optical coupler, an optical splitter, a first optical circulator, a second optical circulator, a first narrow-band filter, a second narrow-band filter, m edge input ports, m edge output ports, 1 convergence input port and 1 convergence output port, wherein the optical coupler is provided with m input ports and 1 output port, the optical splitter is provided with 1 input port and m output ports, the first optical circulator and the second optical circulator are respectively provided with a first port, a second port and a third port, the first narrow-band filter and the second narrow-band filter are respectively provided with a first port and a second port, and the first narrow-band filter and the second narrow-band filter reflect preset wavelength optical signals and transmit all the rest wavelength optical signals; the output port of the optical coupler is connected with the first port of the first optical circulator, the second port of the first optical circulator is connected with the first port of the first narrow-band filter, the third port of the first optical circulator is connected with the first port of the second optical circulator, the second port of the second optical circulator is connected with the first port of the second narrow-band filter, and the third port of the second optical circulator is connected with the input port of the optical splitter;
the m edge input ports are respectively connected with the m input ports of the optical coupler, the m edge output ports are respectively connected with the m output ports of the optical splitter, the convergence input port is connected with the second port of the second narrow-band filter, and the convergence output port is connected with the second port of the first narrow-band filter;
the m edge input ports and the corresponding m edge output ports form m edge switching interfaces, and the convergence input ports and the convergence output ports form 1 convergence switching interface.
2. An electro-optical hybrid dual-layer access network, comprising 1 inter-cluster switch, k passive optical distribution nodes according to claim 1, and k groups of servers;
the k groups of servers respectively comprise a plurality of servers, each server in each group is connected with one edge exchange interface of 1 passive optical distribution node through a respective network interface card, and the servers in each group form 1 computing cluster;
the inter-cluster switch is provided with k switching interfaces which are respectively connected with the aggregation switching interfaces of k passive optical distribution nodes; the method comprises the steps that preset wavelengths of a first narrow-band filter and a second narrow-band filter of a passive optical distribution node are set as intra-cluster channel wavelengths, intra-cluster data exchange is carried out between servers in a calculation cluster through the passive optical distribution node by using intra-cluster channels, and inter-cluster data exchange is achieved between the servers in different calculation clusters through the passive optical distribution node and an inter-cluster switch by using uplink channels and downlink channels.
3. Such as rightThe electro-optical hybrid dual-layer access network of claim 2, wherein the switch interface of the inter-cluster switch comprises a switch interface control unit, a switch interface electrical buffer, a fixed wavelength transceiver array, a switch interface multiplexer, a switch interface demultiplexer, a switch interface input port, and a switch interface output port, wherein the fixed wavelength transceiver array comprises n fixed wavelength transceivers having an optical transmission port, an optical reception port, an electrical transmission port, and an electrical reception port, and the optical transmission ports of the n fixed wavelength transceivers use n downlink channel wavelengths λ respectivelyd1To lambdadnThe optical receiving ports of the n fixed wavelength transceivers use n uplink channel wavelengths lambda respectivelyu1To lambdaunThe switching interface multiplexer is provided with n input ports and 1 output port, and the switching interface demultiplexer is provided with 1 input port and n output ports;
the optical transmitting ports of n fixed wavelength transceivers in the fixed wavelength transceiver array are respectively connected with n input ports of the exchange interface multiplexer, the optical receiving ports of n fixed wavelength transceivers in the fixed wavelength transceiver array are respectively connected with n output ports of the exchange interface demultiplexer, the electrical transmitting ports and the electrical receiving ports of n fixed wavelength transceivers in the fixed wavelength transceiver array are both connected with the exchange interface electrical cache, the output port of the exchange interface multiplexer is connected with the exchange interface output port, the input port of the exchange interface demultiplexer is connected with the exchange interface input port, the exchange interface output port and the exchange interface input port are connected with the convergence exchange interface of the passive optical distribution node, and the exchange interface control unit realizes the scheduling of the transmission and the reception of data messages in the exchange interface electrical cache.
4. The electro-optical hybrid dual access network of claim 2, wherein the network interface card comprises an interface card control unit, an interface card electrical buffer, a tunable transceiver, an interface card fixed wavelength transceiver, an interface card multiplexer, an interface card demultiplexer, an interface card input port, and an interface card output port, wherein the tunable transceiver and the interface card fixed wavelength transceiver each have an interface card fixed wavelength transceiverRespective optical transmitting port, optical receiving port, electrical transmitting port, electrical receiving port, the optical transmitting port of the tunable transceiver being at n upstream channel wavelengths λu1To lambdaunInternally tuned, tunable transceiver optical receive port at n downstream channel wavelengths λd1To lambdadnInternal tuning, interface card fixing wavelength transceiver optical transmitting port and optical receiving port both using inter-cluster channel wavelength lambdacThe interface card multiplexer has 2 input ports and 1 output port, and the interface card demultiplexer has 1 input port and 2 output ports;
the optical sending ports of the tunable transceiver and the interface card fixed wavelength transceiver are respectively connected with 2 input ports of the interface card multiplexer, the optical receiving ports of the tunable transceiver and the interface card fixed wavelength transceiver are respectively connected with 2 output ports of the interface card demultiplexer, the respective electrical sending ports and electrical receiving ports of the tunable transceiver and the interface card fixed wavelength transceiver are respectively connected with an interface card electrical cache, the output port of the interface card multiplexer is connected with an interface card output port, the input port of the interface card demultiplexer is connected with the interface card input port, the interface card output port and the interface card input port are connected with an edge exchange interface, and the interface card control unit schedules the sending and receiving of data messages in the interface card electrical cache and controls the output and input wavelengths of the optical sending port and the optical receiving port of the tunable transceiver.
5. The electro-optical hybrid dual-layer access network of claim 2, wherein each switching interface of the inter-cluster switch and the network interface card of each server use an uplink channel and a downlink channel to transmit control signaling, and use a multi-point access control protocol to implement a scheduling algorithm for inter-cluster switching to implement a medium access control function.
6. The electro-optic hybrid dual-layer access network of claim 2, wherein a bus-based media access control algorithm is used to share intra-cluster channel bandwidth during data exchange between servers in a computing cluster via intra-cluster channels.
7. The electro-optical hybrid dual access network as claimed in claim 4, wherein when the number of wavelengths n is less than the number of servers in each group, the interface card control unit of the network interface card controls the tunable transceiver, tunes the wavelengths of the optical transmission port and the optical reception port, and balances the network load carried by the respective wavelength channels.
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