CN105516312A - Software defined networking load balancingdevice and method - Google Patents

Software defined networking load balancingdevice and method Download PDF

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Publication number
CN105516312A
CN105516312A CN201510909759.6A CN201510909759A CN105516312A CN 105516312 A CN105516312 A CN 105516312A CN 201510909759 A CN201510909759 A CN 201510909759A CN 105516312 A CN105516312 A CN 105516312A
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virtual switch
load
network
virtual
section
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CN105516312B (en
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柴蓉
李海鹏
陈前斌
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Chongqing youlaite Technology Co.,Ltd.
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Chongqing University of Post and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing
    • H04L67/1008—Server selection for load balancing based on parameters of servers, e.g. available memory or workload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing
    • H04L67/1025—Dynamic adaptation of the criteria on which the server selection is based

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention relates to a software defined networking load balancing device and method belonging to the mobile communication technical field. In the method, core network switches are virtualized as virtual switches according to the business support capability, further network slices are constructed on the basis of the virtual switches; a load balancing device on an SDN (software defined networking) control plane collects user business characteristic information and network slice state information, data stream routing load states and slice built-in virtual switch load states are evaluated, a network slice data stream routing switching strategy is determined so as to realize load balancingamong the network slices and in the slices. According to the method and device provided in the invention, the load balancing among the network slices and in the slices is realized; and the utilization rate and the user QoS of the network equipment can be effectively promoted.

Description

A kind of software defined network load balancing apparatus and method
Technical field
The invention belongs to mobile communication technology field, relate to a kind of software defined network load balancing apparatus and method.
Background technology
Software defined network (SoftwareDefinedNetworking, SDN) is the new network framework based on OpenFlow proposed by Stanford Univ USA.The typical architecture of SDN is divided into three layers, and the superiors are application layer, comprises various different business and application; Intermediate layer is key-course, the layout of primary responsibility deal with data forwarding unit resource, maintaining network topological sum state information etc.; The bottom is data Layer, and primary responsibility is based on the data processing of stream table, forwarding and state collection.SDN key property is that control plane is separated with datum plane, centralized network controls, between key-course and data Layer equipment open network interface, network can by external program programming etc.
In SDN framework, the section of the network of Intel Virtualization Technology Network Based can effective user-isolated data traffic, Differentiated Services chain, thus can solve that conventional mobile network cost is high, underaction, QoS are difficult to the problems such as effectively management.In SDN system architecture, how realizing customer traffic in network section, and effectively transmit between each switch of network section, is problem demanding prompt solution to realize data transmission performance optimization.
Document [YangF, GondiV, HallstromJO, etal.OpenFlow-basedloadbalancingforwirelessmeshinfrastru cture [C] // 2014IEEE11thConsumerCommunicationsandNetworkingConferenc e (CCNC), 2014:444-449] for wireless Mesh netword framework, propose a kind of route selection method based on link quality information, namely select the transmission path with best link quality to realize data transmission throughput optimum; Document [WangP, LanJ, ChenS.OpenFlowbasedflowsliceloadbalancing [J] .Communications, China, 2014,11 (12): 72-82] a kind of stream based on OpenFlow section load-balancing algorithm is proposed, by introducing differentiated service theory, data flow is divided, and then for different data streams, application different cutting granularity is cut into slices, each section carries out multidiameter delay transmission according to link load situation, thus realizes the load balancing on each road; Document [Yang Qi, a kind of method across cluster load balance and device, CN104243337A, 2013] a kind of method across cluster load balance is proposed, when the flowing of access that user in network serves certain cluster application is excessive, by SDN control plane by user to the flowing of access load migration of this cluster to other clusters, to realize the load balancing between cluster.
Above document has considered load balancing based on the system architecture of SDN and Route Selection, but existing research does not consider network section and switch load state and user's QoS demand, the present invention is directed to SDN system architecture, virtualized network dicing method Network Based is proposed, and then design efficient load balancing, to realize between network section, load balancing that section is inner and user QoS performance boost.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of software defined network load balancing apparatus and method, the thought that the method and device utilize network to cut into slices, the data stream switching method based on load balancing is realized in section and between section, solve the unbalanced problem of each switch load in network, realize in SDN framework, to concentrated perception and the control of switch load situation in network, thus effectively improve QoS satisfaction, reduction time delay, the lifting network stabilization of user.
For achieving the above object, the invention provides following technical scheme:
A kind of software defined network load-balancing method, comprises the following steps: step one: turn to virtual switch according to business support ability by virtual for core network switches; Step 2: build network section based on virtual switch; Step 3: collect service characteristics information and network section state information, assessment data stream is by virtual switch load condition in load condition and section; Step 4: determine network slice of data stream Routing Handover Strategy, realizes between network section and the load balancing of section inside.
Further, in step 3, according to the load information of virtual switch in each network section, assessment virtual switch and data stream are by load condition; If there is virtual switch or data stream by overload, then according to user's QoS demand information and network slice transmission information, determine candidate virtual switch and data stream by, and then according to load balancing criterion determination data flow handoff destination virtual switch and virtual flow-line.
Further, described assessment virtual switch and data stream, by load condition, adopt following methods: cycle T is divided into M the time interval that length is T/M, i-th virtual switch is defined as in the load factor in m the time interval 1≤i≤N, 1≤m≤M, wherein, represent i-th buffer memory capacity that virtual switch used m the time interval, represent the total capacity of i-th virtual switch buffer memory, N is the quantity of virtual switch in described section; In cycle T, the Rate of average load of virtual switch i is defined as make δ 1for virtual switch load factor threshold value, if virtual switch i overload is then described; In cycle T, certain virtual flow-line average load is defined as wherein, n is virtual switch quantity in described route; Make δ 2for data stream in network section is by Rate of average load threshold value, if then illustrate that this data stream of this cycle is by overload; Otherwise illustrate that in this cycle, data flow routing overhead is reasonable.
Further, the method for described determination candidate virtual switch is: customer service demand information comprises transmission rate, time delay and packet loss, whether meets user's QoS demand according to virtual switch, determines candidate handover virtual switch:
1) if customer service has minimum transmission rate requirement, then need to compare virtual switch transmission rate and user's minimum speed limit demand, note R ifor virtual switch S itransmission rate, R minfor the minimum-rate demand of user, if R i>=R min, then virtual switch S ican be used as candidate virtual switch;
2) if customer service has maximum delay demand, then the processing delay comparing virtual switch is needed whether to meet the maximum delay demand of user, note D ifor virtual switch S ideal with data packet delay, D maxfor the maximum delay demand of user, if D i≤ D max, then virtual switch S ican be used as candidate virtual switch;
3) if customer service has maximum packet loss demand, then need to compare the maximum packet loss demand whether virtual switch packet loss meets user, note PL ifor virtual switch S ipacket loss, PL maxfor the largest tolerable packet loss of user, if PL i≤ PL max, then virtual switch S ican be used as candidate virtual switch.
Further, the described method really setting the goal virtual switch and virtual flow-line specifically comprises: if the virtual flow-line Rate of average load of data flow exceedes threshold value in current network section, then in described section, find available virtual route; If there are many virtual flow-line meeting user's QoS demand, then perform data flow handoff in section, the virtual flow-line selecting current slice average load minimum is data flow handoff target route; If do not exist, then in other sections, find the route whether existing and meet user's QoS demand; If exist, then perform data flow handoff between section, the virtual flow-line that in select target section, average load is minimum is data flow handoff target route, if do not exist, then and this time data flow handoff failure; If current network section in data stream by Rate of average load lower than threshold value, but there is certain virtual switch Rate of average load higher than threshold value, then on virtual flow-line the adjacent two-hop neighbor node of this virtual switch a hop neighbor virtual switch in inquire about the virtual switch whether existing and meet user's QoS demand; If exist, then the virtual switch selecting load factor minimum is switching virtual switch, substitutes virtual flow-line Central Plains virtual switch; If do not exist, then perform data flow handoff between section.
Present invention also offers a kind of software defined network load balancing apparatus, comprising:
1) information platform: collect the QoS demand information of user terminal and carry out the load information of virtual switch in automatic network section; This platform comprises user's request module and network section state collection module, and wherein, user's request module receives the QoS demand information of user terminal; Network section state collection module receives the load information of virtual switch in network section;
2) switchover policy platform: comprise network section state evaluation module and network section load-balancing decision module, wherein, the network section virtual switch load information of network section state evaluation module collected by network section state collection module, critic network section and virtual switch load condition; Network section load-balancing decision module according to active user's QoS demand and network state model, the load in balanced each section between virtual switch and section;
3) information exchange platform: mutual with user terminal, SDN datum plane and SDN controller, obtains user's QoS demand information and network section load information, inputs to information platform; The balanced decision information of handover decisions platform is sent to controller, and controller embeds corresponding stream list item by southbound interface and reaches load balancing in virtual switch.
Beneficial effect of the present invention is: in SDN system architecture, and centralized network controller can obtain the global view of network, by carrying out control and management to the data transfer equipment of network, can to realize customer traffic more efficiently, management and control flexibly.The present invention is by adopting network virtualization technology, virtual switch is turned to by virtual for core network switches, and then build network section based on virtual switch, thus can effective user-isolated data traffic, Differentiated Services chain, the transmission realizing user oriented traffic performance controls; The load balancing that the SDN load balancing apparatus that the present invention proposes and method can effectively realize between network section and section is inner, thus effectively can promote network equipment utilance and user QoS promotes, have broad application prospects.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the apparatus structure schematic diagram of load balancing of the present invention;
Fig. 2 is the example communication system block diagram according to the embodiment of the present invention;
Fig. 3 is the network section load balancing flow chart according to the embodiment of the present invention;
Fig. 4 is the communication scheme of the switchover policy method according to the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is the apparatus structure schematic diagram of load balancing of the present invention, and software defined network load balancing apparatus provided by the invention, comprising:
1) information platform: collect the QoS demand information of user terminal and carry out the load information of virtual switch in automatic network section; This platform comprises user's request module and network section state collection module, and wherein, user's request module receives the QoS demand information of user terminal; Network section state collection module receives the load information of virtual switch in network section;
2) switchover policy platform: comprise network section state evaluation module and network section load-balancing decision module, wherein, the network section virtual switch load information of network section state evaluation module collected by network section state collection module, critic network section and virtual switch load condition; Network section load-balancing decision module according to active user's QoS demand and network state model, the load in balanced each section between virtual switch and section;
3) information exchange platform: mutual with user terminal, SDN datum plane and SDN controller, obtains user's QoS demand information and network section load information, inputs to information platform; The balanced decision information of handover decisions platform is sent to controller, and controller embeds corresponding stream list item by southbound interface and reaches load balancing in virtual switch.
Figure 2 shows that the example communication system block diagram according to the embodiment of the present invention.In this communication system, SDN key-course is controller of increasing income; The data transfer equipment of SDN data Layer can be the router, switch, virtual switch etc. of any support OpenFlow agreement; Wherein, controller of increasing income comprises Floodlight, OpenDaylight, NOX/POX, Ryu, OpenContrail controller etc.
Fig. 3 is network section load balancing flow chart in the embodiment of the present invention, specifically comprises:
Step 301: determine that network is cut into slices.
Virtual switch is turned to by virtual for core network switches according to business support ability, and then based on supporting that the virtual switch unit of delivery of user traffic and other virtual switches meeting user's QoS demand build network section.
Step 302: load balancing apparatus carries out load monitoring.
Collect the QoS demand information of user terminal periodically and carry out the load information of virtual switch in automatic network section.And the information of collection is given network section state evaluation module.
Step 303: assessment data stream is by Rate of average load.
Network section state evaluation module assesses the Rate of average load of virtual switch and data stream by Rate of average load according to the virtual switch load information collected.In current network being cut into slices, the virtual flow-line Rate of average load of data flow compares with virtual switch Rate of average load threshold values all in route, if exceed threshold value, then result is reported the switch decision module of controller.Go to step 304.Otherwise go to step 308.
Virtual switch and data stream as follows by load condition appraisal procedure:
Cycle T is divided into M the time interval that length is T/M, i-th virtual switch is defined as in the load factor in m the time interval 1≤i≤N, 1≤m≤M, wherein, represent that i-th virtual switch has used the capacity of buffer memory m the time interval, represent the total capacity of i-th virtual switch buffer memory, N is the quantity of virtual switch in described section.In cycle T, the Rate of average load of virtual switch i is defined as make δ 1for virtual switch load factor threshold value, if virtual switch i overload is then described.In cycle T, certain virtual flow-line average load is defined as wherein, n is virtual switch quantity in described route.Make δ 2for data stream in network section is by upper all virtual switch Rate of average load threshold values, if then illustrate that this data stream of this cycle is by overload; Otherwise illustrate that in this cycle, data flow routing overhead is reasonable.
Step 304: judge whether there is available route in section.
The QoS demand information of balance policy module according to the user terminal collected and the load information of virtual switch, judge whether there is available virtual route in this section.If exist, go to step 305.Otherwise, go to step 306.
Step 305: perform data flow handoff in section.
Balance policy module shows corresponding virtual switch by the data flow handoff in section to destination virtual route by issuing stream.
Step 306: judge whether other sections exist available virtual route.
The QoS demand information of balance policy module according to the user terminal collected and the load information of virtual switch, in other sections, whether searching exists available virtual route.If exist, go to step 307.Otherwise, this time handoff failure.
Step 307: perform data flow handoff between section.
Balance policy module shows corresponding virtual switch by the data flow handoff in section to destination virtual route by issuing stream.
Step 308: the Rate of average load of assessment virtual switch.
The Rate of average load of this data stream by upper virtual switch is compared with virtual switch load factor threshold value.If exceed threshold value, then result is reported the switch decision module of controller.Go to step 309, otherwise go to step 302.
Step 309: judge whether there is the virtual switch meeting QoS demand in section.
Switch decision module is according to the QoS demand information of the user terminal collected, then on virtual flow-line the adjacent two-hop neighbor node of this virtual switch a hop neighbor virtual switch in inquire about the virtual switch whether existing and meet user's QoS demand, if exist, then go to step 310.If do not exist, then go to step 306.
Step 310: the virtual switch selecting load the lightest is switching virtual switch.
The virtual switch that balance policy model choice load factor is minimum is switching virtual switch, substitutes virtual flow-line Central Plains virtual switch.
Composition graphs 4, determine that the method for candidate virtual switch is specific as follows:
In the section of certain network, data route is S 1→ S 4→ S 7if, virtual switch S 4rate of average load exceed threshold value, then with its upper hop virtual switch S 1adjacent switch S 2, S 3, S 5middle selection object switching virtual switch.
(1) if customer service has minimum transmission rate requirement, then need to compare virtual switch S 2, S 3, S 5transmission rate and user's minimum speed limit demand, note R ifor the purpose of virtual switch S itransmission rate, R minfor the minimum-rate demand of user, if R i>=R min, then virtual switch S ican be used as candidate virtual switch, and then can from candidate virtual switch, select a switch that load is the lightest as object switching virtual switch;
(2) if customer service has maximum delay demand, then need to compare virtual switch S 2, S 3, S 5processing delay whether meet the maximum delay demand of user, note D ifor virtual switch S ideal with data packet delay, D maxfor the maximum delay demand of user, if D i≤ D max, then virtual switch S ican be used as candidate virtual switch, and then can from candidate virtual switch, select a switch that load is the lightest as object switching virtual switch;
(3) if customer service has maximum packet loss demand, then need to compare virtual switch S 2, S 3, S 5whether packet loss meets the maximum packet loss demand of user, note PL ifor virtual switch S ipacket loss, PL maxfor the largest tolerable packet loss of user, if PL i≤ PL max, then virtual switch S ican be used as candidate virtual switch, and then can from candidate virtual switch, select a switch that load is the lightest as object switching virtual switch.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.

Claims (6)

1. a software defined network load-balancing method, is characterized in that: comprise the following steps:
Step one: turn to virtual switch by virtual for core network switches according to business support ability;
Step 2: build network section based on virtual switch;
Step 3: collect service characteristics information and network section state information, assessment data stream is by virtual switch load condition in load condition and section;
Step 4: determine network slice of data stream Routing Handover Strategy, realizes between network section and the load balancing of section inside.
2. a kind of software defined network load-balancing method according to claim 1, is characterized in that: in step 3, and according to the load information of virtual switch in each network section, assessment virtual switch and data stream are by load condition; If there is virtual switch or data stream by overload, then according to user's QoS demand information and network slice transmission information, determine candidate virtual switch and data stream by, and then according to load balancing criterion determination data flow handoff destination virtual switch and virtual flow-line.
3. a kind of software defined network load-balancing method according to claim 2, it is characterized in that: described assessment virtual switch and data stream are by load condition, adopt following methods: cycle T is divided into M the time interval that length is T/M, i-th virtual switch is defined as in the load factor in m the time interval 1≤i≤N, 1≤m≤M, wherein, represent i-th buffer memory capacity that virtual switch used m the time interval, represent the total capacity of i-th virtual switch buffer memory, N is the quantity of virtual switch in described section; In cycle T, the Rate of average load of virtual switch i is defined as make δ 1for virtual switch load factor threshold value, if virtual switch i overload is then described; In cycle T, certain virtual flow-line average load is defined as wherein, n is virtual switch quantity in described route; Make δ 2for data stream in network section is by Rate of average load threshold value, if then illustrate that this data stream of this cycle is by overload; Otherwise illustrate that in this cycle, data flow routing overhead is reasonable.
4. a kind of software defined network load-balancing method according to claim 2, it is characterized in that: the method for described determination candidate virtual switch is: customer service demand information comprises transmission rate, time delay and packet loss, whether meet user's QoS demand according to virtual switch, determine candidate handover virtual switch:
1) if customer service has minimum transmission rate requirement, then need to compare virtual switch transmission rate and user's minimum speed limit demand, note R ifor virtual switch S itransmission rate, R minfor the minimum-rate demand of user, if R i>=R min, then virtual switch S ican be used as candidate virtual switch;
2) if customer service has maximum delay demand, then the processing delay comparing virtual switch is needed whether to meet the maximum delay demand of user, note D ifor virtual switch S ideal with data packet delay, D maxfor the maximum delay demand of user, if D i≤ D max, then virtual switch S ican be used as candidate virtual switch;
3) if customer service has maximum packet loss demand, then need to compare the maximum packet loss demand whether virtual switch packet loss meets user, note PL ifor virtual switch S ipacket loss, PL maxfor the largest tolerable packet loss of user, if PL i≤ PL max, then virtual switch S ican be used as candidate virtual switch.
5. a kind of software defined network load-balancing method according to claim 2, it is characterized in that: the described method really setting the goal virtual switch and virtual flow-line specifically comprises: if the virtual flow-line Rate of average load of data flow exceedes threshold value in current network section, then in described section, find available virtual route; If there are many virtual flow-line meeting user's QoS demand, then perform data flow handoff in section, the virtual flow-line selecting current slice average load minimum is data flow handoff target route; If do not exist, then in other sections, find the route whether existing and meet user's QoS demand; If exist, then perform data flow handoff between section, the virtual flow-line that in select target section, average load is minimum is data flow handoff target route, if do not exist, then and this time data flow handoff failure; If current network section in data stream by Rate of average load lower than threshold value, but there is certain virtual switch Rate of average load higher than threshold value, then on virtual flow-line the adjacent two-hop neighbor node of this virtual switch a hop neighbor virtual switch in inquire about the virtual switch whether existing and meet user's QoS demand; If exist, then the virtual switch selecting load factor minimum is switching virtual switch, substitutes virtual flow-line Central Plains virtual switch; If do not exist, then perform data flow handoff between section.
6. a software defined network load balancing apparatus, is characterized in that: comprising:
1) information platform: collect the QoS demand information of user terminal and carry out the load information of virtual switch in automatic network section; This platform comprises user's request module and network section state collection module, and wherein, user's request module receives the QoS demand information of user terminal; Network section state collection module receives the load information of virtual switch in network section;
2) switchover policy platform: comprise network section state evaluation module and network section load-balancing decision module, wherein, the network section virtual switch load information of network section state evaluation module collected by network section state collection module, critic network section and virtual switch load condition; Network section load-balancing decision module according to active user's QoS demand and network state model, the load in balanced each section between virtual switch and section;
3) information exchange platform: mutual with user terminal, SDN datum plane and SDN controller, obtains user's QoS demand information and network section load information, inputs to information platform; The balanced decision information of handover decisions platform is sent to controller, and controller embeds corresponding stream list item by southbound interface and reaches load balancing in virtual switch.
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