CN105049358A - Virtual forwarding platform of SDN (Software Defined Network) and communication method thereof - Google Patents
Virtual forwarding platform of SDN (Software Defined Network) and communication method thereof Download PDFInfo
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Abstract
The invention discloses a virtual forwarding platform of SDN (Software Defined Network) and communication method thereof, which belong to the technical field of networking to improve the data package forwarding ability of an SDN without having to increase the processing ability of a network switching device. The SDN network's virtual forwarding platform comprises a virtual forwarding management device which dispatches data packages to a virtual forwarding server in accordance to flow table rules configured to a physical switch. The virtual forwarding server carries a virtual switch and is connected to a physical switch through a channel so that the flows from the physical switch can be distributed to the virtual switch. The virtual switch corresponds to the physical switch one by one and with the help of the channel, the virtual switch receives data packages forwarded by the physical switch, processes and forwards further the data packages. The virtual forwarding platform is applied to an SDN network.
Description
Technical field
The present invention relates to networking technology area, specifically, relate to a kind of virtual forwarding platform and communication means thereof of SDN.
Background technology
Software defined network (SoftwareDefinedNetwork, be called for short SDN) be a kind of new network innovation framework, its core technology is by network equipment chain of command and data surface being separated, thus achieve the flexible control of network packet, for the innovation of core network and application provides good platform.In legacy network, every platform switch or router all need the forward-path of independent calculated data bag, and in SDN, the network equipment is only responsible for simple data retransmission, control section is independently then a concentrated controller, is responsible for controlling different business logic, pass-through mode.There is provided the interface of open programmable between control plane and Forwarding plane, the agreement of current main flow is Openflow.
Although SDN has better opening compared to legacy network, also bring certain challenge to the network switching equipment simultaneously.Essentially, this is because SDN is the network built with the pattern of software development, but the network switching equipment the computer equipment of non-universal, in storage resources, computing capability etc., there is huge gap with general computer equipment.Especially, SDN requires that the network switching equipment of data plane can support large-scale stream table, and possesses the ability of process data at high speeds aspect event.Therefore, the existing network switching equipment is not applicable to the mode of operation of SDN very much.
Inventor finds, prior art is normally by improving the disposal ability of the network switching equipment or reducing the requirement of SDN to the network switching equipment and realize mating of SDN and the network switching equipment, but such processing method still cannot ensure that the packet of SDN forwards demand, and improve the cost of SDN, cause the wasting of resources.
Summary of the invention
The object of the present invention is to provide a kind of virtual forwarding platform and communication means thereof of SDN, with when not improving the disposal ability of the network switching equipment, improving the packet transfer capability of SDN.
First aspect present invention provides a kind of virtual forwarding platform of SDN, comprising:
Virtual forwarding manager, by the stream table rule on configures physical switch, to virtual forwarding server data dispatching bag;
Virtual forwarding server, carrying virtual switch, and set up tunnel with physical switches and be connected, by the traffic distribution from physical switches to virtual switch;
Virtual switch, with physical switches one_to_one corresponding, is received the packet of physical switches forwarding, and processes packet and forward by tunnel.
Wherein, after virtual forwarding server gets packet, according to the end-point addresses in the tunnel of packet process, judge the source physical switches of this packet, and packet is transmitted to the virtual switch corresponding with this physical switches.
Wherein, virtual switch carries out forwarding to packet and comprises:
Virtual switch searches the stream list item whether being configured with the packet that correspondence receives, and according to flowing the lookup result forwarding data bag of list item.
Wherein, if virtual switch finds the stream list item being configured with the packet that correspondence receives, virtual switch is drawn together according to the lookup result forwarding data handbag of stream list item:
Virtual forwarding server judges whether this packet has the possibility be modified, the possibility that packet is not modified if determine, and this packet is transmitted to virtual switch corresponding to the object physical switches of this packet by virtual switch; If determine data to be surrounded by the possibility be modified, virtual switch according to find to should the stream list item of packet, forward this packet to another virtual switch.
Wherein, if virtual switch finds the stream list item not being configured with the packet that correspondence receives, virtual switch is drawn together according to the lookup result forwarding data handbag of stream list item:
Virtual switch, according to probability, judges that whether this packet is visible to the controller of SDN;
If it is visible to controller that virtual switch determines this packet, this packet of virtual switch buffer memory also sends packet_in message to controller, treat virtual switch install self-controller to after the stream list item of packet, this packet being forwarded according to stream list item;
If it is invisible to controller that virtual switch determines this packet, packet is transmitted to virtual switch corresponding to the object physical switches of this packet by virtual switch.
Wherein, when controller receives the packet_in message from virtual switch, this packet_in packet labeling is from virtual switch by controller, and by this packet_in message repeating to application program, when program to be applied produces the stream list item corresponding to this packet_in message, this stream list item configures to virtual switch by controller.
Wherein, the load of described probability and controller is negative correlation.
Present invention offers following beneficial effect: the virtual forwarding platform in the embodiment of the present invention is that SDN provides an extendible resource pool, avoids SDN to occur the situation of inadequate resource.Meanwhile, the resource provided due to virtual forwarding platform can be fully utilized, and also improves the utilance of resource for this reason.
Second aspect present invention provides a kind of communication means of virtual forwarding platform of SDN, and the method comprises:
Virtual forwarding manager is regular by the stream table on configures physical switch, to virtual forwarding server data dispatching bag;
Virtual forwarding server by the traffic distribution from physical switches to virtual switch;
Virtual switch receives the packet of physical switches forwarding by tunnel, and processes packet and forward.
Wherein, the traffic distribution from physical switches comprises to virtual switch by virtual forwarding server:
After virtual forwarding server gets packet, according to the end-point addresses in the tunnel of packet process, judge the source physical switches of this packet, and packet is transmitted to the virtual switch corresponding with its source physical switches.
Wherein, virtual switch carries out forwarding to packet and comprises:
Virtual switch searches the stream list item whether being configured with the packet that correspondence receives, and according to flowing the lookup result forwarding data bag of list item.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, accompanying drawing required in describing is done simple introduction below to embodiment:
Fig. 1 is the structural representation of the virtual forwarding platform of the SDN that the embodiment of the present invention provides;
Fig. 2 is the connection diagram of the virtual forwarding server that provides of the embodiment of the present invention and virtual switch, physical switches;
Fig. 3 to Fig. 4 is the test result figure that the embodiment of the present invention provides.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, to the present invention, how application technology means solve technical problem whereby, and the implementation procedure reaching technique effect can fully understand and implement according to this.It should be noted that, only otherwise form conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other, and the technical scheme formed is all within protection scope of the present invention.
Embodiments provide a kind of virtual forwarding platform of SDN, as shown in Figure 1, virtual forwarding manager, virtual forwarding server and virtual switch is provided with in this virtual forwarding platform, virtual switch and physical switches one_to_one corresponding are arranged, as shown in Figure 2, virtual forwarding server is that the physical switches of virtual switch and correspondence thereof sets up tunnel, and packet enters this virtual forwarding platform by tunnel by SDN.
Wherein, virtual forwarding manager is by the stream table rule on configures physical switch, to virtual forwarding server data dispatching bag, the packet corresponding with stream table rule is transferred into virtual forwarding platform, the forwarding of achievement unit divided data bag is carried out by virtual forwarding platform, be conducive to the packet transfer capability improving SDN, improve the data-handling capacity of SDN.
Virtual forwarding server carrying virtual switch in the embodiment of the present invention, be responsible for connecting whole virtual switch and whole physical switches, for virtual switch and the physical switches corresponding with it set up tunnel, by the traffic distribution from physical switches to virtual switch.Wherein, as shown in Figure 2, this virtual forwarding server is the intermediary of virtual switch and physical switches, tunnel is set up between virtual forwarding server and all physical switches, pre-configuredly in physical switches ensure the stream list item that packet can reach, make the packet from the SDN of reality always can arrive corresponding object physical switches, ensure that the connectedness in each tunnel, ensure that this virtual forwarding platform and actual SDN can combine effectively.
Further, this virtual forwarding platform also comprises the virtual switch being responsible for performing forwarding capability.Virtual switch is the projection of physical switches on virtual forwarding platform, is received the packet of physical switches forwarding, and process packet and forward by tunnel.Each virtual switch stores all stream tables of this virtual forwarding platform, performs the operation to packet according to stream table.Wherein, each stream table is made up of many stream list items, and the representative of stream list item forwards rule.The packet entering virtual switch obtains corresponding operation by inquiry stream list item.Stream list item is primarily of matching field (matchfield), counter (counter) and operation (instruction) this three part composition.Wherein, the structure of matching field comprises a lot of occurrence, covers link layer, network layer and transport layer major part mark; Counter is used for adding up the packet in data flow; Operation then indicate that the packet that mates with this stream list item should perform next step operate.
Because the virtual switch in physical switches and virtual forwarding platform is that one_to_one corresponding is arranged, namely each physical switches has a corresponding virtual switch as its projection in virtual forwarding platform.Therefore, virtual forwarding server must know that the source physical switches of the packet got just can be transmitted to corresponding virtual switch.Virtual forwarding server, after getting packet, according to the end-point addresses in the tunnel of packet process, can judge the source physical switches of this packet, packet can be transmitted to the virtual switch corresponding with this source physical switches afterwards.
After virtual switch receives packet, first can search its inside and whether be configured with should the stream list item of packet, and according to the lookup result forwarding data bag of stream list item.
Wherein, if when virtual switch finds the stream list item being configured with the packet that correspondence receives, according to the criterion preset, virtual forwarding server can judge whether this packet has the possibility be modified, namely virtual forwarding server can according to the stream list item in the stream table on carried virtual switch, which find out stream may be modified, and set up these streams that can be modified of a table record, when receiving packet afterwards, namely judge whether packet may be modified according to this table at every turn.If virtual forwarding server determines the possibility that packet is not modified, this packet is transmitted to virtual switch corresponding to the object physical switches of this packet by virtual switch, to reduce the data traffic of whole virtual forwarding platform, reduce the data processing amount of virtual forwarding platform.Otherwise, can be modified if virtual forwarding server determines packet, virtual switch according to find to should the stream list item of packet, forward this packet to another virtual switch.Therefore, packet will carry out step by step forwarding, revising in this virtual forwarding platform, finally can arrive the virtual switch that its order ground physical switches is corresponding, and be forwarded to object physical switches by this virtual switch, complete the whole repeating process of packet.
In addition, if virtual switch finds the stream list item not being configured with the packet that correspondence receives, virtual switch is drawn together according to the lookup result forwarding data handbag of stream list item:
Virtual switch, according to probability, judges that whether this packet is visible to the controller of SDN.In embodiments of the present invention, this probability can be set as that with the load of controller be negative correlation, and namely the load of controller is higher, and probability is less; Otherwise the load of controller is lower, and probability is larger.This probability is the data changed in the moment according to the load of controller, so namely can ensure the accuracy that packet forwards, and virtual forwarding server and controller can be avoided again to be subjected to trigger the Denial of Service attack of packet_in message.
Wherein, if to determine this packet visible to controller for virtual switch, this packet of virtual switch chance buffer memory is waited until and is continued process afterwards, and sends a packet_in message to controller.When controller receives this packet_in message from virtual switch, controller can do a record to this packet_in message, and this packet_in message is transmitted to application program as the event coming from physical switches.When program to be applied produces the stream list item corresponding to this packet_in message, this stream list item configures to all virtual switches in this virtual forwarding platform by controller.
Then send the virtual switch of this packet_in message after corresponding stream list item is installed, can according to the forwarding of this stream list item execution to packet.Describe in the preceding article according to stream list item forwarding data bag, do not repeat them here.
In addition, if virtual switch determine this packet invisible to controller time, just this packet is directly transmitted to the virtual switch that the object physical switches of this packet is corresponding.This packet is directly transmitted to object physical switches by tunnel by the virtual switch corresponding with object physical switches, completes the forwarding work to this packet.
Obviously, in embodiments of the present invention, by being forwarded by virtual forwarding platform by partial data bag, physical switches can be avoided, into each packet sets up stream list item and buffer memory, eliminating the storage resources that part is necessary.In addition, the probability of packet_in message and process corresponding stream list item installation instruction is produced owing to decreasing physical switches, also for physical switches has saved processor resource.From another perspective, virtual forwarding platform enhances the data-handling capacity of physical switches, provides extra Storage and Processing device resource, and resource can be made to obtain consecutive mean distribution, improves the utilance to resource.
Further, in order to the effect of the embodiment of the present invention is described more objectively, can test at identical conditions for traditional SDN and the SDN combining virtual forwarding platform.First set up fat tree (18-aryfat-tree) structure of 18 yuan, be wherein provided with 1458 physical switches, at this, corresponding virtual switch is built to each physical switches.
In traditional SDN, if stream list item does not relate to all packets, packet that cannot be serviced will be buffered (even abandoning) until corresponding stream list item is mounted.Under current strategy, need the stream that some packet is corresponding by the time to terminate, corresponding stream list item can be removed, new stream list item is installed and forwarding data bag.Although the stream list item that can remove also unclosed stream is quickly forwarded to make other stream, this will cause the stream forwarded to be cut off and then to cause more serious problem.
Therefore, the average Forwarding Latency that traditional SDN flows in 30 seconds with the SDN combining virtual forwarding platform is measured in test, as shown in Figure 3.Can find that the time delay that traditional SDN causes due to stream list item deficiency may be very serious.Particularly consider that the forwarding time of the stream of 80% is all within 10 seconds, this time delay is cannot be received.By contrast, combine in the SDN of virtual forwarding platform, some circuits can be caused to extend although carry out converting flow by virtual forwarding platform, time delay almost can be ignored by contrast.
Next, stream list item shortage ratio and the non-usage ratio of stream list item is also measured in test.Whole simulation test continues 5 minutes, is illustrated in figure 4 the test result of last minute.Can find, in traditional SDN, by the resource distribution of static state, be difficult to the situation avoiding inadequate resource.Even if the physical exchange function in SDN supports the stream table of 20K, the stream list item resource on part physical switch is still had to be not being met.If provide more stream list item resource further, the utilance of resource will extremely reduce.This result shows that by providing high performance physical switches to solve inadequate resource be not an effective scheme.
By contrast, as shown in Figure 4, the stream list item shortage ratio combined in the SDN of virtual forwarding platform is almost equal to zero (therefore failing in figure to show), the non-usage ratio of stream list item is also higher than traditional SDN, for SDN provides an extendible resource pool, SDN is avoided to occur the situation of inadequate resource.Meanwhile, the resource provided due to virtual forwarding platform can be fully utilized, and also improves the utilance of resource for this reason.
Although execution mode disclosed in this invention is as above, the execution mode that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Technical staff in any the technical field of the invention; under the prerequisite not departing from spirit and scope disclosed in this invention; any amendment and change can be done what implement in form and in details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (10)
1. a virtual forwarding platform for SDN, is characterized in that, comprising:
Virtual forwarding manager, by the stream table rule on configures physical switch, to virtual forwarding server data dispatching bag;
Virtual forwarding server, carrying virtual switch, and set up tunnel with physical switches and be connected, by the traffic distribution from physical switches to virtual switch;
Virtual switch, with physical switches one_to_one corresponding, is received the packet of physical switches forwarding, and processes packet and forward by tunnel.
2. virtual forwarding platform according to claim 1, is characterized in that,
After virtual forwarding server gets packet, according to the end-point addresses in the tunnel of packet process, judge the source physical switches of this packet, and packet is transmitted to the virtual switch corresponding with this physical switches.
3. virtual forwarding platform according to claim 2, is characterized in that, virtual switch carries out forwarding to packet and comprises:
Virtual switch searches the stream list item whether being configured with the packet that correspondence receives, and according to flowing the lookup result forwarding data bag of list item.
4. virtual forwarding platform according to claim 3, is characterized in that, if virtual switch finds the stream list item being configured with the packet that correspondence receives, virtual switch is drawn together according to the lookup result forwarding data handbag of stream list item:
Virtual forwarding server judges whether this packet has the possibility be modified, the possibility that packet is not modified if determine, and this packet is transmitted to virtual switch corresponding to the object physical switches of this packet by virtual switch; If determine data to be surrounded by the possibility be modified, virtual switch according to find to should the stream list item of packet, forward this packet to another virtual switch.
5. virtual forwarding platform according to claim 3, is characterized in that, if virtual switch finds the stream list item not being configured with the packet that correspondence receives, virtual switch is drawn together according to the lookup result forwarding data handbag of stream list item:
Virtual switch, according to probability, judges that whether this packet is visible to the controller of SDN;
If it is visible to controller that virtual switch determines this packet, this packet of virtual switch buffer memory also sends packet_in message to controller, treat virtual switch install self-controller to after the stream list item of packet, this packet being forwarded according to stream list item;
If it is invisible to controller that virtual switch determines this packet, packet is transmitted to virtual switch corresponding to the object physical switches of this packet by virtual switch.
6. virtual forwarding platform according to claim 5, it is characterized in that, when controller receives the packet_in message from virtual switch, this packet_in packet labeling is from virtual switch by controller, and by this packet_in message repeating to application program, when program to be applied produces the stream list item corresponding to this packet_in message, this stream list item configures to virtual switch by controller.
7. the virtual forwarding platform according to claim 5 or 6, is characterized in that, the load of described probability and controller is negative correlation.
8. a communication means for the virtual forwarding platform of the SDN as described in any one of claim 1-7, is characterized in that, comprising:
Virtual forwarding manager is regular by the stream table on configures physical switch, to virtual forwarding server data dispatching bag;
Virtual forwarding server by the traffic distribution from physical switches to virtual switch;
Virtual switch receives the packet of physical switches forwarding by tunnel, and processes packet and forward.
9. method according to claim 8, is characterized in that, the traffic distribution from physical switches comprises to virtual switch by virtual forwarding server:
After virtual forwarding server gets packet, according to the end-point addresses in the tunnel of packet process, judge the source physical switches of this packet, and packet is transmitted to the virtual switch corresponding with its source physical switches.
10. method according to claim 9, is characterized in that, virtual switch carries out forwarding to packet and comprises:
Virtual switch searches the stream list item whether being configured with the packet that correspondence receives, and according to flowing the lookup result forwarding data bag of list item.
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