CN103986663A - Data center, method for processing data and network controller - Google Patents
Data center, method for processing data and network controller Download PDFInfo
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Abstract
The invention discloses a data center, a method for processing data and a network controller. In the data center based on an SDN, a server generates a corresponding data packet according to protocols supported by the server; a switch receiving the data packet determines that the data packet is a first data packet in a data stream to which the data packet belongs, and the network controller generates a forwarding path according to the type of a data packet forwarding port; other data packets in the data stream to which the data packet belongs are forwarded through the generated forwarding path. According to the method, the type of the data stream is recognized according to the type of the data packet forwarding port, an optimal forwarding path suitable for the data stream is planned, different service grade qualities are matched for different data streams, the bottleneck of data transmission is avoided, and maintenance cost is reduced. Through the data center based on the SDN, the complexity of an original data center is lowered.
Description
Technical field
The present invention relates to software defined network (SDN, Software Defined Network) technology, espespecially a kind of data center based on SDN and realize method and the network controller of data processing.
Background technology
At present, for realize in data center with data center between the communicating by letter of server, need to build network configuration, Fig. 1 is the schematic network structure at available data center, as shown in Figure 1, taking calculation server as boundary, in data center, network can be divided into front network and back-end network.Wherein, front network mainly carrying in data center between calculation server and and data center outside server between communicate by letter, be based on TCP/IP network system framework, the technology of realization is IP+ Ethernet (Ethernet) mode.Back-end network is carrying the communication of server to storage system.Owing to passing through storage area network (SAN between memory device, Storage Area Network) technique construction storage system, it is the technology of a kind of IP+Ethernet of being different from, but, the natural defect of the conflict packet loss having due to Ethernet technology, cannot be met the primary demand such as I/O stationary problem, the low delay of high speed of back-end network.Thereby at present, back-end network adopts SAN (FC SAN, the Fiber Channel SAN) technology based on optical fiber communication substantially, realize communicating by letter of computing system and storage system.
The introducing of FC SAN technology, makes the network of data center have following problem: multiple networks, that is to say, and for calculation server, throw the net in network in Ethernet and FC SAN two; Various ports agreement, because calculation server is present in multiple networks, in order to adapt to the demand of heterogeneous networks, needs to possess the network interface of supporting multiple agreements on calculation server, increased the complexity of calculation server; And Cost Problems, due to FC SAN adopt be optical fiber communication, the equipment cost of link is higher.
For this reason, in the back-end network of data center, introduce the Ethernet (FCoE based on optical fiber communication, Fiber Channel over Ethernet) technology, by original FC packet is carried out to Ethernet encapsulation, realize the fusion of front network and back-end network, Fig. 2 is the existing data center network structural representation based on FCoE technology, as shown in Figure 2, on calculation server, be equipped with CAN network interface card, the equal demand of any communication of calculation server sends to FCoE switch by this CAN network interface card.Be arranged in the data retransmission unit (FCF of FCoE switch, Fiber Channel Forwarder) (not shown in Fig. 2) can identify data, if normal Ethernet packet forwards it in IP/Ethernet network; If be packaged into the FC packet of Ethernet bag, forward it in FC network.
FCoE technology provides the scheme of utilizing Ethernet technology to realize calculation server and back-end storage networks communication requirement, but still has some problems:
On the one hand, in order to ensure the transfer of data of high speed between calculation server and storage system, simultaneously in order to make transfer of data between storage system not take the resource of Ethernet, in data center, the communication network of the communication network of calculation server and storage system is separated, thereby build two networks of throwing the net, attracted the problem of many networks: front network has adopted IP+Ethernet technology to carry out networking, and storage networking adopts SAN technology.FCoE technology, by the mode of packet encapsulation, has realized with ethernet technology connection calculation server and memory device, and still, the network between memory device does not still change, and that is to say, remains the general layout of multiple networks between data center.
On the other hand, in the deployment scheme of FCoE technology, be to dispose FCoE switch in the communication network of calculation server and the edge of storage network substantially at present.Along with the development of cloud computing, the information communication demand between calculation server and storage system will be day by day strong.Flow in order to carry a large amount of data, the deployment scope of FCoE switch will be expanded day by day, and even the deployment of FCoE switch is returned and can be extended to whole storage networking.But FCoE switch belongs to private branch exchange system, the scope of application is narrower; And FCoE switch is based on optical fiber communication, therefore, the cost of the data center network based on FCoE technology is obviously higher, and the construction of later stage storage networking and transformation will cause larger fund input.The more important thing is, under the promotion of cloud computing and the Internet demand, 40/100G network technology has obtained good development in data center, and 40/100G technology also will be propagated its belief on a large scale in data center.But, watch the development in the last few years of FC SAN network quietly, maintain the speed below 10G always.Thereby, between data center, remain in the general layout of multiple networks, will inevitably cause front network and the unmatched problem of back-end network speed, thereby cause the bottleneck of transfer of data.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of data center and realize method and the network controller of data processing, can reduce data center's complexity, avoid the bottleneck of transfer of data, reduce maintenance costs simultaneously.
In order to reach the object of the invention, the invention provides a kind of network controller, at least comprise tactful processing module, stream table handing module, route processing module, and for the topological processing module of maintaining network topology view; Wherein,
Strategy processing module, for the user's request of operation layer being converted to the network demand of respective stream of data, and notifies these network demands to route processing module and stream table handing module;
Route processing module, receives the network demand from tactful processing module, and the network configuration view of safeguarding according to Topology Management module, is the most satisfactory forwarding route of data flow planning;
Stream table handing module, for receiving the network demand from tactful processing module, generates corresponding OpenFlow stream table according to the forwarding route of route processing module planning, and is issued to OpenFlow switch.
Described topological processing module also for the information of the each server by collecting described mechanical floor, builds logical topology figure storage between each server in described network controller.
Described network controller also comprises: device processes module, manages, configures for the network switch that described network data is forwarded to layer.
The present invention discloses again a kind of data center, at least comprises mechanical floor, data retransmission layer, and network control layer; Wherein,
Mechanical floor comprises one or more servers, server comprises calculation server and storage server, for the corresponding packet of protocol generation of supporting according to self, and be connected to data retransmission layer by network interface card, realize between calculation server, exchanges data between calculation server and storage server, between storage server and storage server;
Data retransmission layer supports the network switch of Openflow agreement to form by several, comprises Access Layer and converge/core layer, for the packet from server being carried out to data retransmission according to the control of network control layer;
Network control layer, comprises network controller, for controlling the forwarding of data.
Described access switch also for, a reserved predetermined number high speed uplink interface, for ensureing the network speed of described access switch to converge/core switch; Give described storage server by remaining high-speed port priority allocation.
The invention also discloses a kind of method that data center realizes data processing, comprising: the corresponding packet of protocol generation that server is supported according to self;
First packet in the data flow of the switch specified data bag that receives packet under being, network controller, according to the type of package forward port, generates forward-path;
Other packets under packet in data flow adopt the forward-path generating to forward.
Whether described specified data bag is that first packet in the data flow under it comprises:
According to the field of the expression port type information of described packet, stream list item in coupling switch, if there is not relevant match information in the stream table of switch, determine that described packet is first packet in affiliated data flow, otherwise described packet not the first packet.
Described network controller is according to the type of package forward port, and before generating forward-path, the method also comprises:
Described switch generates and carries out corresponding strategy according to the type of port that receives packet, during from forwarding port at a high speed, this data flow is denoted as to storage flow in data flow, reports described network controller; Described controller is this data flow path planning according to restricted shortest path by preferential CSPF algorithm.
Compared with prior art, the present invention includes: in the data center based on SDN, the corresponding packet of protocol generation that server is supported according to self; First packet in the data flow of specified data bag under being, according to the type of package forward port, generates forward-path; Other packets under packet in data flow adopt the forward-path generating to forward.The inventive method is by the type of the type identification data flow of package forward port, plan the optimum forward-path that is applicable to this data flow, particularly, for the data flow forwarding between high-speed port arranges high grade of service quality, selection quality is good, the path configurations forwarding data flow route that forwarding speed is fast, and be that the data flow forwarding between low-speed port arranges low grade of service quality, it is not best selecting quality, forwarding speed is not the fastest path configurations forwarding data flow route, for different data flow has been mated different grade of service quality, avoid the bottleneck of transfer of data, reduced maintenance costs simultaneously.And data center based on SDN has reduced legacy data center complexity.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in specification, claims and accompanying drawing.
Brief description of the drawings
Accompanying drawing is used to provide the further understanding to technical solution of the present invention, and forms a part for specification, is used from and explains technical scheme of the present invention with the application's embodiment mono-, does not form the restriction to technical solution of the present invention.
Fig. 1 is the schematic network structure at available data center;
Fig. 2 is the existing data center network structural representation based on FCoE technology;
Fig. 3 is the schematic diagram of existing SDN framework;
Fig. 4 is the schematic network structure of data center of the present invention;
Fig. 5 be in data center of the present invention different data streams flow to schematic diagram;
Fig. 6 is the logic composition structural representation of the network controller in data center of the present invention;
Fig. 7 is the flow chart that the present invention realizes the method for data processing.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the combination in any mutually of the feature in embodiment and embodiment in the application.
Can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing.And, although there is shown logical order in flow process, in some cases, can carry out shown or described step with the order being different from herein.
Software defined network (SDN, Software Defined Network) be to control with forwarding to separate and the direct programmable network architecture, Fig. 3 is the schematic diagram of existing SDN framework, as shown in Figure 3, its core concept is the framework that the tightly coupled legacy network devices network architecture is decoupled into application, control, three layers of separation of data (forwarding), and realizes the able to programme of the centralized management of network and network application by standardization.Under SDN framework, open and standardization is core key point: the interface of standardized data face and chain of command, be called again southbound interface, shield the isomerism of network infrastructure resource at aspects such as the agreements of type, support, make the Internet resources facility resource of data surface can receive without barrier the instruction of chain of command, the data retransmission business in bearer network; The interface of standardization control layer and application layer, is called again northbound interface, for upper layer application provides unified administration view and DLL (dynamic link library), makes user to come define grid control and network service from logic by software.
Fig. 4 is the schematic network structure of data center of the present invention, as shown in Figure 4, at least comprises mechanical floor, data retransmission layer, and network control layer; Wherein,
Mechanical floor, comprising one or more servers, here, server comprises calculation server and storage server, calculation server, storage server all for, the corresponding packet of protocol generation of supporting according to self, and be connected to the access switch of data retransmission layer by network interface card, and by access switch realize between calculation server, exchanges data between calculation server and storage server, between storage server and storage server.
Data retransmission layer comprises Access Layer and converge/core layer, supports the network switch of Openflow agreement to form, for the packet from server being carried out to data retransmission according to the control of network control layer by several.
In data retransmission layer, all network switchs are all by agreement unified, standard, i.e. Openflow agreement, communicates with the network controller in network control layer.Like this, on the one hand, the agreement of standard is that network controller has shielded the isomerism of the equipment such as calculation server, storage server in mechanical floor, that is to say, equipment in mechanical floor not there are differences network controller, thereby has reduced the degree of dependence to devices from different manufacturers; On the other hand, the essence of network is exactly data retransmission, thereby can relate to a large amount of data transfer equipments, in data center of the present invention, the cost of data transfer equipment is only forwarding chip, more easily realizes volume production, makes the reduction of network cost have larger advantage.
In data center of the present invention, in order to reduce as much as possible the restriction of physical port speed to speed data stream, in the time of the connected mode building between calculating/storage server and access switch, access switch and converge/core switch, first, the reserved predetermined number of access switch is as 2 high speed uplink interfaces, for ensureing the network speed of access switch to converge/core switch; Secondly,, if also have high-speed port residue, so, follow the principle of priority allocation to storage server.It should be noted that, be not must ensure can connect with high-speed port between all switches here, still, according to the inventive method, can meet high speed connection requirement as far as possible; As shown in Figure 5, Fig. 5 be in data center of the present invention different data streams flow to schematic diagram, in Fig. 5, taking access switch, converge/core be exchanged for OpenFlow switch, network controller as SDN controller be example, port shown in the little square frame of diagonal line hatches represents switch ports themselves at a high speed, and tiltedly port shown in the little square frame of lattice shade represents the switch ports themselves of low speed.
Network control layer, comprises network controller, for controlling the forwarding of data, and the management of data center.Fig. 6 is the logic composition structural representation of the network controller in data center of the present invention, as shown in Figure 6, mainly comprises tactful processing module, stream table handing module, route processing module, and for the topological processing module of maintaining network topology view; Wherein,
Strategy processing module, for the user's request of operation layer being converted to the network demand of respective stream of data, such as network delay requirement, retransmission rate requirement etc., and notifies these network demands to route processing module and stream table handing module.Particularly, be used to calculation server, from the forwarding demand between calculation server, calculation server and storage server, storage server, different network service qualitys is set.
Route processing module, receives the network demand from tactful processing module, and the network configuration view of safeguarding according to Topology Management module, is the most satisfactory forwarding route of data flow planning.
Stream table handing module, for receiving the network demand from tactful processing module, generates corresponding OpenFlow stream table according to the forwarding route of route processing module planning, and is issued to OpenFlow switch.Like this, in the time that the packet from server passes through these OpenFlow switches, forward according to the stream table of storing in OpenFlow switch.
The present invention's topology processing module also for the information of the each server by collecting device layer, builds logical topology figure storage between each server in network controller, like this, in the time generating forward-path, can be used as foundation.Wherein, the information of collection includes but not limited to: corresponding relation, the type of server (as calculation server or storage server) etc. of the port of server, the information of neighbor nodes of server and neighbours and port.Specifically construction logic topological diagram how, belongs to those skilled in the art's conventional techniques means, is not intended to limit the scope of the invention, and repeats no more here.
Network controller of the present invention also comprises: device processes module, carry out condition monitoring for network data being forwarded to the network switch of layer, forward port setting, VLAN arranges etc., to realize management, the configuration of network controller to the network switch in data retransmission layer.
In the network controller of data center of the present invention, the various functions of network controller is adopted to visualization interface intuitively, represent to network management personnel, network management personnel arranges every user's request by visualization interface, and offers tactful processing module.
Data center of the present invention also comprises: network application layer, comprise as the application such as fire compartment wall, network monitoring, and utilize the open api interface of network control layer, by developer's independent development, its specific implementation, not within protection scope of the present invention, repeats no more here.
In the data center network framework that the present invention is based on SDN shown in Fig. 4, at mechanical floor, IP/Ethernet agreement is followed in data communication between calculation server and calculation server, and between calculation server and storage server, and FC SAN agreement is followed in communication between storage server.With respect to TCP/IP framework, the data center network framework that the present invention is based on SDN makes full use of the equipment (as calculation server, storage server etc.) of existing network, do not need existing equipment to upgrade, the protocol generation data message that equipment is supported according to self, the present invention only needs to throw the net and can carry traditional Ethernet, the data traffic of storage network, has reduced data center's complexity; The network switch in data center of the present invention is the OpenFlow switch of supporting Openflow agreement, all network switchs all communicate by the network controller in agreement and the network control layer of unification, standard, and only retain forwarding face, make the network switch can volume production, reduce network cost, and the agreement of standard is that network controller has shielded the isomerism of various device in mechanical floor, equipment in mechanical floor not there are differences network controller, thereby reduced the degree of dependence to devices from different manufacturers.The more important thing is, network controller of the present invention, in the time determining demand strategy, is distinguished different data streams different grade of service quality is set, and to generate the optimum forward-path that is applicable to this data flow, has avoided the bottleneck of transfer of data, has reduced maintenance costs simultaneously.
Fig. 7 is the flow chart that the present invention realizes the method for data processing, as shown in Figure 7, comprising:
Step 700: the corresponding packet of protocol generation that server is supported according to self.The specific implementation of this step belongs to those skilled in the art's conventional techniques means, repeats no more here.
Step 701: first packet in the data flow of the switch specified data bag that receives packet under being, network controller, according to the type of package forward port, generates forward-path.
This step also comprises: if packet is not first packet in data flow under it, so, forward process ends according to the forward-path issuing before.
In this step, whether specified data bag is that first packet in the data flow under it comprises: the field that represents port type information according to the L2/L3/L4 of packet, port numbers, VLAN etc., stream list item in coupling switch, if there is not relevant match information in the stream table of switch, determine that this packet is first packet in affiliated data flow, otherwise this packet not the first packet.
In this step, if switch generates the corresponding strategy data flow of execution from forwarding port at a high speed according to the type of the port that receives packet, this data flow is denoted as to storage flow, reports SDN controller; Routing Forward Module in SDN controller can be that this data flow is planned suitable path according to CSPF algorithm, such as the path with roomy, link utilization is lower.Here, use which kind of strategy relevant to network configuration, can reach by the constraints of setting in CSPF.
Here, the algorithm that generates forwarding route can adopt existing restricted shortest path by preferential (CSPF) algorithm, and according to self-demand, the constraints in algorithm is modified and mated.Due to features such as the link holding time of memorying data flow are long, data traffic is large, therefore, constraints wherein can be embodied as: link accumulative total occupancy <70%, to make memorying data flow select non-key busy route, the specific rules of constraints and the demand of data flow, webmaster personnel's design here etc. are relevant.The use of CSPF algorithm belongs to those skilled in the art's common technology, repeats no more here.
Step 702: other packets under packet in data flow adopt the forward-path generating to forward.
Give an example, the method that the present invention realizes data processing comprises:
Server in mechanical floor according to self support the corresponding packet of protocol generation, and by corresponding network interface card by Packet Generation to the network switch; At data retransmission layer, the packet that the network switch is received according to fields match such as L2/L3/L4, port numbers, VLAN, to determine that whether this packet is first packet in affiliated data flow; If so, by this package forward to the network controller in network control layer, network controller is by the demand strategy such as form and agreement of overall unified view and packet, generates the corresponding route that forwards; And send to the relevant network switch by forwarding accordingly route, like this, other packets of this that later receive data flow will adopt the forwarding route generating to forward; If not first packet, forward according to the forward-path that network controller issues before.Wherein, generating the corresponding route that forwards specifically comprises: if when data flow comes from forwarding port at a high speed and will go to forwarding interface at a high speed, think that this data flow is the data flow between storage server and storage server, or network service quality is required to high data flow.At this moment, network controller arranges high grade of service quality can to this part data flow, and in the time of configuration data flow forwarding route, can select the path that quality is good, forwarding speed is fast.
The inventive method is by the type classification different data streams of package forward port, different grade of service quality is set, generate the optimum forward-path that is applicable to this data flow, be the data flow forwarding between high-speed port high grade of service quality is set, selection quality is good, the path configurations forwarding data flow route that forwarding speed is fast, and be that the data flow forwarding between low-speed port arranges low grade of service quality, it is not best selecting quality, forwarding speed is not the fastest path configurations forwarding data flow route, avoid the bottleneck of transfer of data, reduced maintenance costs simultaneously.
Although the disclosed execution mode of the present invention as above, the execution mode that described content only adopts for ease of understanding the present invention, not in order to limit the present invention.Those of skill in the art under any the present invention; do not departing under the prerequisite of the disclosed spirit and scope of the present invention; can in the form of implementing and details, carry out any amendment and variation; but scope of patent protection of the present invention, still must be as the criterion with the scope that appending claims was defined.
Claims (9)
1. a network controller, is characterized in that, at least comprises tactful processing module, stream table handing module, route processing module, and for the topological processing module of maintaining network topology view; Wherein,
Strategy processing module, for the user's request of operation layer being converted to the network demand of respective stream of data, and notifies these network demands to route processing module and stream table handing module;
Route processing module, receives the network demand from tactful processing module, and the network configuration view of safeguarding according to Topology Management module, is the most satisfactory forwarding route of data flow planning;
Stream table handing module, for receiving the network demand from tactful processing module, generates corresponding OpenFlow stream table according to the forwarding route of route processing module planning, and is issued to OpenFlow switch.
2. data center according to claim 1, is characterized in that, described topological processing module, also for the information of the each server by collecting described mechanical floor, builds logical topology figure storage between each server in described network controller.
3. data center according to claim 1 and 2, is characterized in that, described network controller also comprises: device processes module, manages, configures for the network switch that described network data is forwarded to layer.
4. a data center, is characterized in that, at least comprises mechanical floor, data retransmission layer, and network control layer; Wherein,
Mechanical floor comprises one or more servers, server comprises calculation server and storage server, for the corresponding packet of protocol generation of supporting according to self, and be connected to data retransmission layer by network interface card, realize between calculation server, exchanges data between calculation server and storage server, between storage server and storage server;
Data retransmission layer supports the network switch of Openflow agreement to form by several, comprises Access Layer and converge/core layer, for the packet from server being carried out to data retransmission according to the control of network control layer;
Network control layer, comprises network controller, for controlling the forwarding of data.
5. data center according to claim 4, is characterized in that, described access switch also for, a reserved predetermined number high speed uplink interface, for ensureing the network speed of described access switch to converge/core switch; Give described storage server by remaining high-speed port priority allocation.
6. according to the data center described in claim 4 or 5, it is characterized in that, described controller is as described in claim 1～3.
7. data center realizes a method for data processing, it is characterized in that, comprising: the corresponding packet of protocol generation that server is supported according to self;
First packet in the data flow of the switch specified data bag that receives packet under being, network controller, according to the type of package forward port, generates forward-path;
Other packets under packet in data flow adopt the forward-path generating to forward.
8. method according to claim 7, is characterized in that, whether described specified data bag is that first packet in the data flow under it comprises:
According to the field of the expression port type information of described packet, stream list item in coupling switch, if there is not relevant match information in the stream table of switch, determine that described packet is first packet in affiliated data flow, otherwise described packet not the first packet.
9. according to the method described in claim 7 or 8, it is characterized in that, described network controller is according to the type of package forward port, and before generating forward-path, the method also comprises:
Described switch generates and carries out corresponding strategy according to the type of port that receives packet, during from forwarding port at a high speed, this data flow is denoted as to storage flow in data flow, reports described network controller; Described controller is this data flow path planning according to restricted shortest path by preferential CSPF algorithm.
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