CN105306365A - Power communication network and capacity expansion and destroy-resistant routing path determination method thereof - Google Patents
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Abstract
The invention discloses a power communication network and a capacity expansion and destroy-resistant routing path determination method thereof, and belongs to the technical field of communication. The power communication network comprises a client terminal, a centralized controller and multiple switches which support an OpenFlow protocol. Application of a software defined network enables power data communication to obtain a global network view, so that high quality of service is ensured. Information interaction is carried out between the centralized controller and the switches which support the OpenFlow protocol; when the power communication network requires capacity expansion or is in fault, a forwarding path is configured automatically, a processing delay is reduced, the capacity expansion speed and fault recovery are speeded up, the configuration error rate is decreased greatly, and consumption of the manpower resource is reduced.
Description
Technical field
The invention belongs to the communication technology, particularly relate to a kind of powerline network and dilatation thereof and resist and ruin routed path defining method.
Background technology
Traditional distributed AC servo system based on Synchronous Digital Hierarchy cannot meet the demand of fine granularity flow monitoring in power telecom network.In addition, traditional intelligence electric network is seldom considered power telecom network dilatation by path calculation method and is resisted the application scenarios and demand ruined.When power telecom network needs dilatation or breaks down, still by the method for human configuration forward-path, thus produce higher configuration fault rate, consume too much human resources, and occur the situation that dilatation speed and fault recovery are all slower.
Software defined network can make manager carry out the overall situation by centerized fusion device to power telecom network to control and monitoring, and meanwhile, it can dynamically and rapid configuration forward-path.
Summary of the invention
For the deficiency that existing method exists, the invention provides a kind of powerline network and dilatation thereof and resist and ruin routed path defining method.
The technical solution adopted in the present invention is achieved in that
A kind of powerline network, is software defined network, comprises client terminal, also comprises the switch of a centerized fusion device and multiple support OpenFlow agreement;
With multiple, described centerized fusion device, for supporting that the switch of OpenFlow agreement establishes a connection; Send each switch of message calls to each switch and send their respective physical features and function information to it; The attribute of each switch is arranged and deletes all stream list items; According to the link information that switch is collected, obtain the topology of whole network; According to user request information and network topology, be that every bar data flow sets up overall shortest route path by OpenFlow agreement; When network generation dilatation or after breaking down, the corresponding increase of collecting according to switch or lost chains road information, dynamically update network topology structure; According to the network topology dynamically updated and corresponding user request information, recalculate shortest route path and issue to switch and flow list item accordingly;
Described switch, for establishing a connection with centerized fusion device; Its physical features and function information are sent to centerized fusion device; According to Link Layer Discovery Protocol, real-time link information is sent to centerized fusion device; The solicited message of user is sent to centerized fusion device;
The dilatation of described powerline network ruins routed path defining method with anti-, comprises the steps:
Step 1: the OpenFlow protocol version that both sides support consulted by centerized fusion device and respectively supporting between the switch of OpenFlow agreement, to establish a connection;
Step 2: centerized fusion device sends each switch of message calls to each switch and sends their respective physical features and function information to it;
Step 3: each switch answers the requirement of centerized fusion device to send their respective physical features and function information to centerized fusion device;
Step 4: the attribute of centerized fusion device to each switch is arranged;
Step 5: centerized fusion device carries out Initialize installation to each switch, namely deletes all stream list items;
Step 6: link information is sent to centerized fusion device according to Link Layer Discovery Protocol by each switch;
Step 7: the link information collected according to switch, obtains and upgrades the topology of whole network;
Step 8: the user request information that first switch receiving user request information is received sends to centerized fusion device;
Step 9: according to user request information and real-time dynamic network topology, flow list item by OpenFlow agreement accordingly for user asks to set up overall shortest path and issues to switch;
Step 10: when after network generation dilatation or fault, switch collects corresponding increasing or lost chains road information, returns step 7;
The invention has the beneficial effects as follows: software defined network is applied in electric power data communication by the present invention, makes electric power data communication obtain global network view, service quality obtains better quality and ensures.Propose a kind of dilatation for the software defined network for electric power data communication again and ruin routed path defining method with anti-, when power telecom network needs dilatation or breaks down, automatic configuration forward-path, reduce processing delay, dilatation speed and fault recovery are accelerated, and significantly reduces configuration fault rate and reduce human resources consumption.
Accompanying drawing explanation
Fig. 1 is the powerline network example topology figure of embodiment of the present invention;
Fig. 2 is the software defined network fundamental diagram of embodiment of the present invention;
Fig. 3 is the stream list item structural representation of embodiment of the present invention;
Fig. 4 is that the dilatation of embodiment of the present invention powerline network ruins routed path defining method flow chart with anti-;
Fig. 5 is the routing path calculation method schematic diagram after the dilatation of embodiment of the present invention power telecom network;
Fig. 6 is the routing path calculation method schematic diagram after embodiment of the present invention power telecom network breaks down;
Fig. 7 is that embodiment of the present invention adopts the dilatation of powerline network and the anti-end-to-end time delay comparison diagram ruining dilatation scene that routed path defining method obtains and the end-to-end time delay in fault scenes shortest route path and the shortest route path of normal scene.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The software defined network for electric power data communication of present embodiment, as shown in Figure 1, comprises client terminal main frame 1 and main frame 2, also comprises the switch of a centerized fusion device and 9 support OpenFlow agreements; Wherein main frame 1 is responsible for sending packet and main frame 2 is responsible for receiving packet.Main frame 1 is equivalent to the substation in power telecom network, and main frame 2 is equivalent to the main website in power telecom network, utilizes main frame 1 and main frame 2 to simulate communication in power telecom network between main website and substation.Wherein, that the centerized fusion device of present embodiment adopts is NOX; Adopt OpenvSwitch, generate in conjunction with KVM virtualization platform the virtual switch that nine are supported OpenFlow agreement.The IP address of the NOX controller in present embodiment, main frame 1 and main frame 2 is respectively 192.168.100.100,192.168.100.1,192.168.100.2.Support that the virtual switch of OpenFlow agreement is followed successively by Br0, Br1, Br2 for nine, Br3, Br4, Br5, Br6, Br7, Br8, their IP address is followed successively by 192.168.100.20,192.168.100.21,192.168.100.22,192.168.100.23,192.168.100.24,192.168.100.25,192.168.100.26,192.168.100.27,192.168.100.28.
Data retransmission in software defined network is the operation based on stream.Switch carrys out forwarding data bag according to the rule of stream list item, and all network control functions have been come by the network application in NOX controller.As shown in Figure 2, NOX controller mainly comprises nucleus module and the network application module of NOX.Wherein nucleus module mainly comprises: thread library module; Event dispatching module; Application deployment module; The parsing of OpenFlow data and package module; Connection management module etc.Wherein, thread library module is for providing the threading operation of operating system.Event dispatching module is responsible for the event scheduling produced to apply, to make corresponding process to event to corresponding.The deployment that application deployment module in charge is coordinated between each application performs.The parsing of OpenFlow packet and package module are used for resolving and encapsulation OpenFlow protocol data bag.Connection establishment between connection management module in charge controller and switch.Network application module mainly comprises: store application; Find application; Host-tracking is applied; Authentication application; Topology application; Route is applied; Monitoring application; Spanning tree is applied; Traffic grooming application etc.Store the essential information that application is used for storage switch.Find that application is responsible for finding bottom switch, send LLDP bag by Packet_out information order switch and then find link, and linkevent event of dishing out.Host-tracking application is used for following the tracks of the main frame of access network.Authentication application is responsible for the position of main frame and switch in tracking network.Topology application is for preserving the link structure activated at present in network.Be responsible for the topology safeguarding and upgrade whole bottom physical network.Route application calculates path between node for utilizing algorithm of Shortest Path for Dynamic Situation.Monitoring application is responsible for collecting and keep the statistical information of switch in network, stream table, queue and port.Spanning tree application module is the requisite bottom module of route selection module.In OpenFlow network, controller can be arranged by the physical port of Port_mod message to switch, and this port can be made to abandon broadcast packet.Even if this means that switch receives the order of the inundation to packet, this packet is also only send from the several ports determined, instead of all of the port on switch, doing so avoids broadcast storm.Issue the application of stream table for when network generation dilatation and fault, apply according to route the stream table that the path recalculated re-issues respective switch.
Stream table is made up of a lot of stream list items, and each stream list item is exactly one and forwards rule.The packet entering switch obtains the destination interface of forwarding by inquiry stream table.Stream list item as shown in Figure 3, is made up of header field, counter and operation.Wherein, header field is ten tuple, is the mark of stream list item; Counter is used for counting the statistics flowing list item; Operation designates the operation that the packet that mates with this stream list item should perform.OF escape way connects OpenvSwitch switch and NOX controller.NOX controller, by this Interface Controller and management OpenvSwitch switch, receives the event from switch with Time Controller and sends packet to switch.Switch is communicated by escape way with controller, and the form that all information must specify according to OpenFlow agreement performs.
The dilatation of the powerline network of present embodiment ruins routed path defining method with anti-, comprises the steps:
Step 1: the OpenFlow protocol version that both sides support consulted by centerized fusion device and respectively supporting between the switch of OpenFlow agreement, to establish a connection;
Support that the virtual switch of OpenFlow agreement sends OPFT_HELLO message to NOX controller for nine of present embodiment; Respectively to nine, NOX controller supports that the virtual switch of OpenFlow agreement sends OPFT_HELLO message, consult the OpenFlow protocol version that both sides support, set up annexation.
Step 2: centerized fusion device sends each switch of message calls to each switch and sends their respective physical features and function information to it;
In present embodiment, to nine, NOX controller supports that the virtual switch of OpenFlow agreements sends OPFT_FEATURES_REQUEST message respectively, requires that each switch sends their respective physical features and function information to it.
Step 3: each switch answers the requirement of centerized fusion device to send their respective physical features and function information to centerized fusion device;
Support that the virtual switch of OpenFlow agreement returns OPFT_FEATURES_REPLY message to NOX controller for nine of present embodiment, inform their respective physical features and function information, such as, tell that NOX controller switch has how many stream tables and how many ports, possess the function such as stream list item statistics, stream table statistics, port statistics, priority-queue statistic, support which motion action etc.
Step 4: the attribute of centerized fusion device to each switch is arranged;
In present embodiment, to nine, NOX controller supports that the virtual switch of OpenFlow agreement sends OPFT_SET_CONFIG message respectively, and arrange their attribute, the maximum length as setting data bag is 128 bytes.
Step 5: centerized fusion device carries out Initialize installation to each switch, namely deletes all stream list items;
In present embodiment, to nine, NOX controller supports that the virtual switch of OpenFlow agreement sends OPFT_FLOW_MOD message, starts most to be delete all stream list items.
Step 6: link information is sent to centerized fusion device according to Link Layer Discovery Protocol by each switch;
Step 7: the link information collected according to switch, obtains the topology of whole network;
Step 8: the user request information that first switch receiving user request information is received sends to centerized fusion device; When there being packet to arrive switch, if the stream list item do not matched with packet, then switch sends PacketIn message to NOX controller, as shown in Figure 4, and judge whether packet is LLDP (Link Layer Discovery Protocol) packet, no, and words then perform step 9, and the words being then return step 7.
Step 9: according to user request information and real-time dynamic network topology, flow list item by OpenFlow agreement accordingly for user asks to set up overall shortest path and issues to switch;
After NOX controller receives PacketIn message, NOX controller carries out packet and resolves acquisition destination host address and find the switch address be attached thereto.And calculating shortest path by source, object switch address, the request for packet is set up route and is issued to switch and flows list item accordingly.As shown in Figure 4, if this shortest path is illegal, then packet inundation is gone out.To nine, present embodiment NOX controller is by supporting that the virtual switch of OpenFlow agreement sends OPFT_PORT_MOD message, specify their physical port behavior, certain port of such as configuration switch, does not comprise this port when there is inundation, and then avoids the broadcast storm of network.
Step 10: when after network generation dilatation or fault, switch collects corresponding increasing or lost chains road information, returns step 7;
After network generation dilatation, the discovery application in NOX controller sends datapath-join (link increase) event alert to route application.After receiving warning, route application sends the OPFT_FLOW_MOD message after upgrading to the switch of relevant support OpenFlow agreement, thus the shortest route path after configuration network dilatation.After network failure, the discovery application in NOX controller sends datapath-leave (loss of link) event alert to route application.After receiving warning, route application sends the OPFT_FLOW_MOD message after upgrading to the switch of relevant support OpenFlow agreement, thus configuration network break down after route recovery path.
As shown in Figure 5, in the original power communication net topology shown in Fig. 1, add the virtual switch Br9 supporting OpenFlow agreement, thus the dilatation scene of simulation power telecom network, meanwhile, two new links
with
be established.The electric power data sent when main frame 1 arrives Br8, Packet_In message will be sent to NOX controller, discovery application in NOX controller sends above-mentioned datapath-join event alert to route application, and the shortest route path after route application adopts shortest path first to calculate the network capacity extension is: No. 7 output ports of No. 9 input port → Br0 of No. 2 output port → Br0 of No. 4 input port → Br9 of No. 9 output port → Br9 of No. 7 input port → Br8 of Br8.Route application sends the OPFT_FLOW_MOD message after upgrading to the switch b r8 of relevant support OpenFlow agreement, Br9 and Br0, thus this shortest route path after configuration network dilatation.
As shown in Figure 6, in the original power communication net topology shown in Fig. 1, delete the virtual switch Br1 supporting OpenFlow agreement, thus the fault scenes of simulation power telecom network, meanwhile, three links
with
lost efficacy.The electric power data sent when main frame 1 arrives Br5, Packet_In message will be sent to NOX controller, NOX controller sends above-mentioned datapath-leave event alert to rapid configuration forward-path module, and the route recovery path after rapid configuration forward-path module adopts shortest path first to calculate network failure is: No. 7 output ports of No. 6 input port → Br0 of No. 2 output port → Br0 of No. 6 input port → Br3 of No. 2 output port → Br3 of No. 6 input port → Br7 of No. 6 output port → Br7 of No. 7 input port → Br8 of Br8.Route application is to the switch b r8 of relevant support OpenFlow agreement, and Br7, Br3 and Br0 send the OPFT_FLOW_MOD message after upgrading, thus configuration network break down after this route recovery path.
In Fig. 7, dilatation scene is the situation of powerline network generation dilatation; Fault scenes is the situation of powerline network generation network failure, and normal scene is the situation that dilatation and fault do not occur powerline network.End-to-end (to destination address, the main frame 1 sending data arrives between the main frame 2 of reception data source address) latency measurement adopts the method for Ping order, measures 15 groups of data and asks its mean value again.From Fig. 7, can find out and utilize the dilatation of powerline network of the present invention and the anti-end-to-end time delay ruining the shortest route path that routed path defining method calculates for dilatation scene and fault scenes, approach very much the end-to-end time delay in the shortest route path of normal scene, thus demonstrate validity of the present invention.
Claims (3)
1. a powerline network, belongs to software defined network, comprises client terminal, also comprises the switch of a centerized fusion device and multiple support OpenFlow agreement;
With multiple, described centerized fusion device, for supporting that the switch of OpenFlow agreement establishes a connection; Send each switch of message calls to each switch and send their respective physical features and function information to it; The attribute of each switch is arranged and deletes all stream list items; According to the link information that switch is collected, obtain the topology of whole network; According to user request information and network topology, be that every bar data flow sets up overall shortest route path by OpenFlow agreement; When network generation dilatation or after breaking down, the corresponding increase of collecting according to switch or lost chains road information, dynamically update network topology structure; According to the network topology dynamically updated and corresponding user request information, recalculate shortest route path and issue to switch and flow list item accordingly;
Described switch, for establishing a connection with centerized fusion device; Its physical features and function information are sent to centerized fusion device; According to Link Layer Discovery Protocol, real-time link information is sent to centerized fusion device; The solicited message of user is sent to centerized fusion device.
2. the dilatation of powerline network according to claim 1 ruins routed path defining method with anti-, it is characterized in that: comprise the steps:
Step 1: the OpenFlow protocol version that both sides support consulted by centerized fusion device and respectively supporting between the switch of OpenFlow agreement, to establish a connection;
Step 2: centerized fusion device sends each switch of message calls to each switch and sends their respective physical features and function information to it;
Step 3: each switch responds centerized fusion device requirement, to their respective physical features and function information of centerized fusion device;
Step 4: the attribute of centerized fusion device to each switch is arranged;
Step 5: centerized fusion device carries out Initialize installation to each switch;
Step 6: link information is sent to centerized fusion device according to Link Layer Discovery Protocol by each switch;
Step 7: the link information collected according to switch, obtains and upgrades the topology of whole network;
Step 8: the user request information that first switch receiving user request information is received sends to centerized fusion device;
Step 9: according to user request information and real-time dynamic network topology, flow list item by OpenFlow agreement accordingly for user asks to set up overall shortest path and issues to switch;
Step 10: when after network generation dilatation or fault, switch collects corresponding increasing or lost chains road information, returns step 7.
3. the traffic grooming method of the software defined network for electric power data communication according to claim 2, is characterized in that: the method that in described step 5, centerized fusion device carries out Initialize installation to each switch is delete all stream list items.
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