CN104601488A - Flow control method and device in SDN (software defined network) - Google Patents
Flow control method and device in SDN (software defined network) Download PDFInfo
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- CN104601488A CN104601488A CN201510031238.5A CN201510031238A CN104601488A CN 104601488 A CN104601488 A CN 104601488A CN 201510031238 A CN201510031238 A CN 201510031238A CN 104601488 A CN104601488 A CN 104601488A
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Abstract
The invention provides a flow control method in an SDN (software defined network). The flow control method in the SDN includes that a controller sends information which carries packet loss conditions for an arbitrary port on an exchanger to the exchanger, and the packet loss information of the port is reported to the controller when a packet loss situation of the port of the exchanger meets the packet loss conditions; when the controller receives a message which carries the packet loss information of the port and is reported by the exchanger, the controller performs path adjustment for flow of the port according to the packet loss information carried in the message and a flow list issued to the exchanger. Based on the same inventive concept, the invention further provides a flow control device in the SDN. The flow control device in the SDN cam timely and accurately control flow in the SDN.
Description
Technical field
The present invention relates to communication technical field, particularly flow control methods and device in a kind of software defined network.
Background technology
Controller can obtain the state information of the port of switch periodically from each switch, as the upper speed etc. of the port on switch; Controller according to the maximum rate of the port status information adjustment port obtained or adjustment by the flow path quantity of this port.
But controller is all generally timing to be obtained to switch, if software defined network (Soft DefineNetwork, SDN) when scale is less, controller can travel through successively respective switch obtain its counting messages be used to guide subsequent flows table create, but when network size is larger, the counting messages information that controller travels through switch in turn can expend long time, all the more so in a fairly large number of situation of switch ports themselves, the statistical information obtained when traveling through excessive cycle can not reflect the traffic forwarding state that network is current accurately.Counting messages data on a lot of switches in network are not really useful, can not realize carrying out controlling in time, accurately to the stream in SDN.
Summary of the invention
In view of this, the application provides flow control methods and device in a kind of software defined network, the problem must not carry out in time the stream in SDN with solution, control accurately.
For solving the problems of the technologies described above, the technical scheme of the application is achieved in that
Flow control methods in a kind of software defined network, the method comprises:
Controller sends the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, make this switch when the packet drop of this port meets described packet loss condition, by this controller of packet loss information reporting of this port;
When what this controller received that this switch reports carries the message of packet loss information of this port, according to the packet loss information of carrying in this message, and to the stream indicator that switch issues, route adjust is carried out to the flow on this port.
Volume control device in a kind of software defined network, be applied in the controller in SDN, this device comprises: Transmit-Receive Unit and processing unit;
Described Transmit-Receive Unit, for sending the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, makes this switch when the packet drop of this port meets described packet loss condition, by this controller of packet loss information reporting of this port; Receive the message of carrying the packet loss information of this port that this switch reports;
Described processing unit, for receive when described Transmit-Receive Unit that this switch reports carry the message of packet loss information of this port time, according to the packet loss information of carrying in this message, and to the stream indicator that switch issues, route adjust is carried out to the flow on this port.
From technical scheme above, when meeting packet loss condition by the packet drop of controller notice switch Single port in office in the application, by the packet loss information active reporting controller of this port, controller carries out route adjust according to packet loss information and the stream indicator that is handed down to each switch to the flow on this port, can control in time, exactly the flow in SDN.
Accompanying drawing explanation
Flow control methods schematic flow sheet in software defined network in Fig. 1 the embodiment of the present application;
Fig. 2 is SDN networking schematic diagram in the embodiment of the present application;
Fig. 3 is the apparatus structure schematic diagram being applied to above-mentioned technology in the embodiment of the present application.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing and according to embodiment, technical scheme of the present invention is described in detail.
Flow control methods in a kind of software defined network is proposed in the embodiment of the present application, the packet drop of controller notice switch Single port in office meets packet loss condition to be made, by the packet loss information active reporting controller of this port, controller carries out route adjust according to packet loss information and the stream indicator that is handed down to each switch to the flow on this port, can control in time, exactly the flow in SDN.
See flow control methods schematic flow sheet in software defined network in Fig. 1, Fig. 1 the embodiment of the present application.Concrete steps are:
Step 101, controller sends the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, make this switch when the packet drop of this port meets described packet loss condition, by this controller of packet loss information reporting of this port.
Described packet loss condition in this step is: preset packet loss threshold value and flow forwarding congested;
It is that the stream number of dropped packets on this port reaches default packet loss threshold value that the packet drop of this port described meets described packet loss condition; Or flow forwarding on this port is congested, namely when packet loss condition is multiple, meets one of them packet loss condition switch and just reports packet loss information.
When switch receives the packet loss condition of carrying for the arbitrary port on this switch of controller transmission, store packet loss condition for this port.
The embodiment of the present application is when specific implementation, and controller sends the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, can upgrade (Modification) message for port; Be carried in port updating message by packet loss condition and send.
During specific implementation, a marker bit allowing to report can be carried in port updating message, when making the switch receiving this message know that the packet drop of this port meets pre-conditioned, the packet loss information of this port of active reporting; And increase field in this message port updating message, or reserved field is used to carry packet loss condition.
This switch is monitored for the packet drop of this port, when the packet drop of this port meets described packet loss condition, by the packet loss information reporting controller of this port, and after by packet loss information reporting controller, remove relevant packet loss information, restart to monitor.
In the embodiment of the present application, the packet loss information of reporting port has two kinds of trigger conditions, and a kind of is that stream number of dropped packets on this port reaches default packet loss threshold value; A kind of is that flow forwarding on this port is congested.
Step 102, when what this controller received that this switch reports carries the message of packet loss information of this port, according to the packet loss information of carrying in this message, and carries out route adjust to the stream indicator that switch issues to the flow on this port.
This step middle controller receives the message of carrying the packet loss information of this port that this switch reports, and is port status (Status) message.Namely packet loss information is carried in port status information reporting controller.
In the embodiment of the present application, packet drop occurs switch Single port in office and have two kinds, a kind of is that the physical state of this port does not change, but the traffic forwarding mistake on this port, namely there is packet loss; A kind ofly be that certain flow rate due to this port forwarding is excessive and to cause this port to occur congested.
The concrete processing procedure of controller for the packet loss of two kinds of situations is described below respectively.
The first, when the number of dropped packets of the flow that switch monitors on this port on that port reaches default packet loss threshold value, send the message of carrying number of dropped packets to controller.
When this controller receives the message of carrying number of dropped packets, again for flowing down on this port sends the stream table (port outside the port of generation packet loss) that mouth is other port, the stream table this switch being used re-issue sends stream, wherein, other port described is the port that can reach next equipment arrived by the port of packet loss, wherein reach for directly reaching or indirectly can reach, flowing through other ports described and finally can also be sent to next equipment originally arrived by packet loss port namely by packet loss port repeat.
When other port described is when indirectly can reach next equipment arrived by the port of packet loss, this controller can reach institute's warp between next equipment described equipment for the stream on the port of packet loss issues the stream table forwarding corresponding stream, also can not issue, when the switch making not exist stream table is to controller request stream table, then issue stream table to corresponding switch.
When this switch receives the stream table that controller newly issues, upgrade the local correspondence stream table stored, use the stream table after upgrading to instruct the forwarding of flow, and then the flow on the port of generation packet loss is forwarded by the corresponding ports in the stream table that newly issues.
The second, when this port of this switch monitoring on this port, flow forwarding is congested, carrying congested, the congested coefficient of flow forwarding to controller report and forwarding the message of attribute information of congested stream.
Wherein, congested coefficient is the ratio of the packet loss speed of this port and the transmission rate of this port; The attribute information forwarding congested stream is source address and the destination address of this stream.
When this controller receive the packet loss information of carrying be congested, the congested coefficient of flow forwarding and the message of attribute information forwarding congested stream time, this controller is according to the attribute information of the congested stream of the forwarding of carrying in the message received, and the stream table to issue for each switch, determine to receive the source switch forwarding congested stream; Described source switch is the switch receiving this stream in SDN.
This controller determines whether forward congested stream allows to abandon further, if, issue speed limit stream table according to the congested coefficient carried in the message received to described source switch, make described source switch receive this stream according to the speed in this speed limit stream table on the port receiving this stream; Otherwise, according to the congested coefficient carried in the message received and the bandwidth forwarding congested port, again be that the congested stream of this forwarding generates stream and shows forwarding on the path outside path, congested port place, and by the stream table regenerated to this stream switch on path issue, make each switch forward this stream according to the stream table re-issued.
This stream switch on path comprise all switches from described source switch to object switch institute warp, each switch forwards this stream according to the stream table re-issued, and this stream can not again by congested port occurs.
According to congested coefficient with forward the bandwidth of congested port and determine new stream table in the present embodiment, to forward the speed that congested stream occurs congested port being informed in, in order to avoid move to when other port sending this stream, cause other port generation congestion phenomenon.
Determine in the present embodiment that whether forward congested stream allows to abandon, and namely determines the importance of this stream, if this stream is important, then determines not allow to abandon this stream; Otherwise, determine to abandon this stream.
When described source switch receives the speed limit stream table for arbitrary stream, the port receiving this stream receives this stream according to the speed in this speed limit stream table, congestion phenomenon would not be there is again in the switch that on such reporting port, flow forwarding is congested on the port sending this stream, wherein, according to the speed in congested coefficient determination speed limit stream table.
When described source switch receives the stream table re-issued, upgrade the local stream table stored, subsequent match forwards to the stream of this stream table according to this stream table.
By above-mentioned implementation, the embodiment of the present application achieves switch and initiatively notices packet drop on port, and controller is controlled in time, exactly to the flow in SDN; Simultaneously when carrying out flow control, achieving flow path and controlling end to end.
Below in conjunction with accompanying drawing, describe the processing procedure of above-mentioned two kinds of packet drops in detail.
Be SDN networking schematic diagram in the embodiment of the present application see Fig. 2, Fig. 2.In SDN as shown in Figure 2, switch 1, switch 2, switch 3, switch 4 are Openflow switch, controller issues the message of the packet loss condition of the port for switch to each switch, make each switch store corresponding packet loss condition for each port.As congested in controller notice switch 2 flow forwarding on port 3, or the number of dropped packets of this port reaches default packet loss thresholding, as 100 time, to the packet loss information of this controller report port 3; Port 3 for switch 3 issues same message.
Switch 1, switch 2 and switch 3 all exist the customer flow arriving switch 4, under normal circumstances, these flows can normally be forwarded in descending user network.
Flow on each switch local port is monitored, and so that packet loss to occur the port 3 of switch 2, supposes at a time, and the stream number of dropped packets of the forwarding on port 3 is 100, then this number of dropped packets is reported controller.
Controller receive switch 2 for port 3 send to carry number of dropped packets be the port status message of 100 time, know that packet loss occurs the port 3 on switch 2, then upgrading the stream table that the local outbound port issued on switch 2 is port 3, being specially outbound port as being updated to port 2; And each stream table after upgrading is issued each switch 2.
The stream table that switch 2 uses controller newly to issue upgrades the local correspondence stream table stored, and uses the stream table after upgrading to forward related streams follow-up, then related streams can not be sent by port 3 again.
Suppose that switch 3 monitors flow forwarding on port 3 congested, then obtain the attribute information forwarding congested stream, and calculate congested coefficient.Switch 3 carries the message of the attribute information of the congested coefficient stream congested with forwarding to controller report.
When controller receives this message, the attribute according to the congested stream of the forwarding reported determines source switch, supposes that source switch is switch 1; And determine whether forward congested stream allows to abandon further.
When controller determines that this stream allows to abandon, generate speed limit stream table according to congested coefficient for port one switch 1 receiving this stream, and be handed down to switch 1.
When switch 1 receives the speed limit stream table of this stream, the port one receiving this stream receives this stream according to the speed in speed limit stream table.
When controller determines that this stream does not allow to abandon this stream, determine this stream on switch 1 to adjust on other path to send according to the bandwidth on the port 3 of congested coefficient and switch 3, as originally sent by port 3, adjust to now and sent by port 2, then regenerate stream table for this stream, and be issued on switch 1.
Switch 1 upgrades the stream table of this stream correspondence, follow-up need to forward this stream time, the port 2 in being shown by stream is forwarded.
Based on same inventive concept, the application also proposes volume control device in a kind of software defined network, is applied in the controller in SDN.It is the apparatus structure schematic diagram being applied to above-mentioned technology in the embodiment of the present application see Fig. 3, Fig. 3.This device comprises: Transmit-Receive Unit 301 and processing unit 302;
Transmit-Receive Unit 301, for sending the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, makes this switch when the packet drop of this port meets described packet loss condition, by this controller of packet loss information reporting of this port; Receive the message of carrying the packet loss information of this port that this switch reports;
Processing unit 302, for receive when Transmit-Receive Unit 301 that this switch reports carry the message of packet loss information of this port time, according to the packet loss information of carrying in this message, and to the stream indicator that switch issues, route adjust is carried out to the flow on this port.
Preferably,
Described packet loss condition is: preset packet loss threshold value and flow forwarding congested;
It is that the stream number of dropped packets on this port reaches default packet loss threshold value that the packet drop of this port described meets described packet loss condition; Or flow forwarding on this port is congested.
Preferably,
Processing unit 302, when packet loss information specifically for carrying when the message received is number of dropped packets, again for flowing down on this port sends the stream table that mouth is other port, the stream table this switch being used re-issue sends stream, wherein, other port described is the port that can reach next equipment arrived by the port of packet loss; When other port described is when indirectly can reach next equipment arrived by the port of packet loss, the equipment reaching institute's warp between next equipment described for the stream on the port of packet loss issues the stream table forwarding corresponding stream.
Preferably,
Processing unit 302, packet loss information specifically for carrying when the message received be congested coefficient and the attribute information forwarding congested stream time, according to the attribute information of the congested stream of the forwarding of carrying in the message received, and the stream table to issue for each switch, determine to receive the source switch forwarding congested stream; Described source switch is the switch receiving this stream in SDN; And determine whether forward congested stream allows to abandon further, if, issue speed limit stream table according to the congested coefficient carried in the message received to described source switch, make described source switch receive this stream according to the speed in this speed limit stream table on the port receiving this stream; Otherwise, according to the congested coefficient carried in the message received and the bandwidth forwarding congested port, again be that the congested stream of this forwarding generates stream and shows forwarding on the path outside path, congested port place, and the stream table regenerated is issued to the switch on described source switch and path, make the switch on described source switch and path forward this stream according to the stream table re-issued.
Preferably,
Described controller sends the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, for port upgrades Modification message;
This controller described receives the message of carrying the packet loss information of this port that this switch reports, and is port status Status message.
The unit of above-described embodiment can be integrated in one, and also can be separated deployment; A unit can be merged into, also can split into multiple subelement further.
In sum, when the application meets packet loss condition by the packet drop of controller notice switch Single port in office, by the packet loss information active reporting controller of this port, controller carries out route adjust according to packet loss information and the stream indicator that is handed down to each switch to the flow on this port, can control in time, exactly the flow in SDN.
Port occurs flow forwarding congested time, can also control congested stream occurs from source, achieve current control end to end.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a flow control methods in software defined network SDN, it is characterized in that, the method comprises:
Controller sends the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, make this switch when the packet drop of this port meets described packet loss condition, by this controller of packet loss information reporting of this port;
When what this controller received that this switch reports carries the message of packet loss information of this port, according to the packet loss information of carrying in this message, and to the stream indicator that switch issues, route adjust is carried out to the flow on this port.
2. method according to claim 1, is characterized in that,
Described packet loss condition is: preset packet loss threshold value and flow forwarding congested;
It is that the stream number of dropped packets on this port reaches default packet loss threshold value that the packet drop of this port described meets described packet loss condition; Or flow forwarding on this port is congested.
3. method according to claim 2, is characterized in that,
When the packet loss information that the message that this controller receives is carried is number of dropped packets, the described packet loss information according to carrying in this message, and to the stream indicator that switch issues, route adjust is carried out to the flow on this port, comprising:
This controller sends for flowing down on this port the stream table that mouth is other port again, and the stream table this switch being used re-issue sends and flows, and wherein, other port described is the port that can reach next equipment arrived by the port of packet loss.
4. method according to claim 2, is characterized in that,
When the packet loss information that the message that this controller receives is carried be congested coefficient and the attribute information forwarding congested stream time, the described packet loss information according to carrying in this message, and to the stream indicator that switch issues, route adjust is carried out to the flow on this port, comprising:
This controller is according to the attribute information of the congested stream of the forwarding of carrying in the message received, and the stream table issued for each switch, determines to receive the source switch forwarding congested stream; Described source switch is the switch receiving this stream in SDN;
And determine whether forward congested stream allows to abandon further, if, issue speed limit stream table according to the congested coefficient carried in the message received to described source switch, make described source switch receive this stream according to the speed in this speed limit stream table on the port receiving this stream; Otherwise, according to the congested coefficient carried in the message received and the bandwidth forwarding congested port, again be that the congested stream of this forwarding generates stream and shows forwarding on the path outside path, congested port place, and by the stream table regenerated to this stream switch on path issue, make each switch forward this stream according to the stream table re-issued.
5. the method according to claim 1-4 any one, is characterized in that,
Described controller sends the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, for port upgrades Modification message;
This controller described receives the message of carrying the packet loss information of this port that this switch reports, and is port status Status message.
6. a volume control device in software defined network SDN, is applied in the controller in SDN, it is characterized in that, this device comprises: Transmit-Receive Unit and processing unit;
Described Transmit-Receive Unit, for sending the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, makes this switch when the packet drop of this port meets described packet loss condition, by this controller of packet loss information reporting of this port; Receive the message of carrying the packet loss information of this port that this switch reports;
Described processing unit, for receive when described Transmit-Receive Unit that this switch reports carry the message of packet loss information of this port time, according to the packet loss information of carrying in this message, and to the stream indicator that switch issues, route adjust is carried out to the flow on this port.
7. device according to claim 6, is characterized in that,
Described packet loss condition is: preset packet loss threshold value and flow forwarding congested;
It is that the stream number of dropped packets on this port reaches default packet loss threshold value that the packet drop of this port described meets described packet loss condition; Or flow forwarding on this port is congested.
8. device according to claim 7, is characterized in that,
Described processing unit, when packet loss information specifically for carrying when the message received is number of dropped packets, again for flowing down on this port sends the stream table that mouth is other port, the stream table this switch being used re-issue sends stream, wherein, other port described is the port that can reach next equipment arrived by the port of packet loss.
9. device according to claim 7, is characterized in that,
Described processing unit, packet loss information specifically for carrying when the message received be congested coefficient and the attribute information forwarding congested stream time, according to the attribute information of the congested stream of the forwarding of carrying in the message received, and the stream table to issue for each switch, determine to receive the source switch forwarding congested stream; Described source switch is the switch receiving this stream in SDN; And determine whether forward congested stream allows to abandon further, if, issue speed limit stream table according to the congested coefficient carried in the message received to described source switch, make described source switch receive this stream according to the speed in this speed limit stream table on the port receiving this stream; Otherwise, according to the congested coefficient carried in the message received and the bandwidth forwarding congested port, again be that the congested stream of this forwarding generates stream and shows forwarding on the path outside path, congested port place, and by the stream table regenerated to this stream switch on path issue, make each switch forward this stream according to the stream table re-issued.
10. the device described arbitrarily according to claim 6-9, is characterized in that,
Described controller sends the message of the packet loss condition of carrying for the arbitrary port on this switch to switch, for port upgrades Modification message;
This controller described receives the message of carrying the packet loss information of this port that this switch reports, and is port status Status message.
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