CN104283722A - SDN link state information collecting method and device - Google Patents
SDN link state information collecting method and device Download PDFInfo
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Abstract
The invention provides a software defined network (SDN) link state information collecting method and device, and an SDN switching device applied to the SDN. The method includes the steps of obtaining the device identification of each adjacent SDN device; generating link state information, wherein the link state information comprises the correspondence between an interface for obtaining the device identification of each adjacent SDN device and the device identification of each adjacent SDN device; sending the link state information to an SDN controller so that the SDN controller can collect all the link state information in the SDN. The method is easy to implement, and the collecting efficiency of SDN topological information is effectively improved.
Description
Technical field
The present invention relates to network communication technology field, particularly relate to a kind of SDN link-state information collection method and device.
Background technology
SDN (Software Defined Networks, software defined network) is a kind of new network innovation framework, by being separated with datum plane by control plane, realizes the flexible control of network traffics.The SDN equipment be applied in SDN comprises SDN controller and SDN switching equipment.Collection network topology information is responsible for by SDN controller, the forward-path of computing service message, the forwarding flow table service control message repeating that SDN switching equipment issues according to SDN controller.
At present, the collection of SDN topology information adopts LLDP (Link Layer Discovery Protocol, Link Layer Discovery Protocol) agreement, and SDN controller is physical topology information by the network topological information that this agreement gets; Obtain three layers of configuration information of switching equipment again according to the information interaction of SDN controller and SDN switching equipment, physical topology information is combined with three layers of configuration information of each switching equipment, realizes the collection to network three etale topology information.
Above-mentioned to be converted to the collection method of network three etale topology information from physical topology information more loaded down with trivial details, and efficiency is low, and the SDN equipment of each producer is when being configured information interaction, often adopts proprietary protocol, poor expandability.
Summary of the invention
In view of this, this application provides a kind of software defined network SDN link-state information collection method, be applied to the SDN switching equipment in SDN, the method comprises:
Obtain the device identification of each adjacent S DN equipment;
Link generation state information, described link-state information comprises the corresponding relation of the interface of the device identification getting described adjacent S DN equipment and the device identification of described adjacent S DN equipment;
Send described link-state information to SDN controller, collect all link-state informations in described SDN to make described SDN controller.
Present invention also provides a kind of software defined network SDN link-state information gathering-device, be applied to the SDN switching equipment in SDN, this device comprises:
Mark acquiring unit, for obtaining the device identification of each adjacent S DN equipment;
Information generating unit, for link generation state information, described link-state information comprises the corresponding relation of the interface of the device identification getting described adjacent S DN equipment and the device identification of described adjacent S DN equipment;
Information transmitting unit, for sending described link-state information to SDN controller, collects all link-state informations in described SDN to make described SDN controller.
In this application, collecting agreement by running three etale topologies on SDN equipment, making SDN controller directly can get the link-state information of all SDN switching equipment in SDN.The method is simple, improves the collection efficiency of network topological information.
Accompanying drawing explanation
Fig. 1 is SDN structural representation;
Fig. 2 is standard ospf protocol state machine diagram;
Fig. 3 is the process chart of SDN link-state information collection method in a kind of execution mode of the application;
Fig. 4 is the underlying hardware schematic diagram of SDN link-state information gathering-device in a kind of execution mode of the application;
Fig. 5 is the structural representation of SDN link-state information gathering-device in a kind of execution mode of the application.
Embodiment
For making the object of the application, technical scheme and advantage clearly understand, referring to accompanying drawing, scheme described in the application is described in further detail.
Figure 1 shows that SDN structural representation.SDN equipment in SDN comprises SDN controller and SDN switching equipment (SW1, SW2 and SW3).What prior art adopted when carrying out SDN topology information collection is physical topology information agreement, and physical topology information in conjunction with three of SDN switching equipment layer configuration information, need be converted to three etale topology information by SDN controller, and this transfer process is complicated, and efficiency is low.
For the problems referred to above, the embodiment of the present application proposes a kind of SDN link-state information collection method, by directly running three etale topology information agreements on SDN equipment, make SDN controller directly can get the link-state information of all SDN switching equipment in SDN, thus realize the collection of three etale topology information.
The embodiment of the present application is example with OSPF (Open Shortest Path First, ospf) agreement, by realizing the collection of three etale topology information to the expansion of ospf protocol.Ospf protocol is an Interior Gateway Protocol, for decision-making route in single autonomous system.By ospf protocol message switching link-state information between the equipment of operation ospf protocol.
See Fig. 2, be standard ospf protocol state machine diagram, the network equipment showing operation standard ospf protocol when carrying out link-state information and being mutual each state of process.Wherein, Down (initial condition) represents and does not also start exchange message between the network equipment, now, can send hello packet (neighbor uni-cast message), set up neighborhood; Attempt (intermediateness 1) and Init (intermediateness 2) is intermediateness, network type different the intermediateness of process also can be different, this state is transitory state, and the session of this state lower network equipment room is not also set up; 2-Way (session establishment state) represents that the bi-directional session of LA Management Room is set up, and form neighborhood, link-state information generates in this case; ExStart (information exchange initial condition) is the preparatory stage before information exchange, sets up master slave relation between the network equipment; Exchange (information exchange state) represents the summary info of link exchange state information between the network equipment; Loading (information stress state) represents when there being new link-state information to need to load, to the link-state information that peer network device request of loading is new; Full (complete adjacency state) represents that link-state information has loaded, and the LSD between the network equipment is synchronous.
See Fig. 3, be an embodiment flow chart of the application SDN link-state information collection method, this embodiment is described from the collection process of SDN switching equipment side to SDN link-state information.
Step 310, obtains the device identification of each adjacent S DN equipment.
First, all SDN equipment in SDN start ospf protocol, SDN equipment finds neighbours by sending hello packet under Down state.In the embodiment of the present application, when SDN switching equipment receives the hello packet of adjacent S DN equipment transmission, can get the device identification of adjacent S DN equipment from hello packet, this device identification is the unique identity of adjacent S DN equipment.
Step 320, link generation state information, described link-state information comprises the corresponding relation of the interface of the device identification getting described adjacent S DN equipment and the device identification of described adjacent S DN equipment.
After SDN switching equipment gets the device identification of adjacent S DN equipment by hello packet, enter 2-Way state, in this condition according to the interface receiving hello packet and the device identification of adjacent S DN equipment got from this hello packet, set up the corresponding relation of the device identification of interface and adjacent S DN equipment, namely generate the link-state information for this interface.For SW1 shown in Fig. 1, SW1 receives the hello packet that SW2 sends on interface S1, the device identification of SW2 is obtained (such as from hello packet, 1.1.1.1), set up the corresponding relation of S1 and device identification (1.1.1.1), SW1 knows that SW2 is neighbouring device, is connected on S1 interface.SDN switching equipment, by carrying out above-mentioned process to each interface, obtains the link-state information of total interface.
Visible, SDN switching equipment, under 2-Way state, has generated the link-state information for describing network topology.In SDN, the calculating of service message forward-path is responsible for by SDN controller, only has SDN controller to need to know the link-state information of the whole network, do not need link exchange state information and path computing between SDN switching equipment.Therefore, the ospf protocol run between SDN switching equipment stops continuing forward transition under 2-Way state, no longer carries out follow-up link-state information and exchanges.The embodiment of the present application, by running part ospf protocol between SDN switching equipment, decreases agreement operand.
Step 330, sends described link-state information to SDN controller, collects all link-state informations in described SDN to make described SDN controller.
SDN switching equipment is after generating local all link-state informations, the link-state information of this locality is sent to SDN controller, carries out computation with the link-state information making SDN controller send according to all SDN switching equipment in the SDN collected.
Because SDN switching equipment is different from the annexation of SDN controller, its mode sending link-state information to SDN controller is also different.Known SDN switching equipment can obtain the device identification of adjacent S DN equipment by hello packet in step 210, knows the SDN equipment be adjacent.Therefore, SDN switching equipment can inquire about local all devices mark of preserving, and judges that whether SDN switching equipment is adjacent with SDN controller.According to the annexation of SDN switching equipment and SDN controller, SDN switching equipment can send link-state information by following two kinds of modes to SDN controller.
When SDN switching equipment is adjacent with SDN controller, the ospf protocol of operation standard between SDN switching equipment and SDN controller, protocol status runs to Full state always, and the link-state information completed between SDN controller and adjacent S DN switching equipment exchanges.SDN switching equipment sends link-state information by multicast message LSU (Link State Update, link state update) message to SDN controller.Because SDN switching equipment only needs link-state information to send to SDN controller, therefore, SDN switching equipment, when sending link-state information, does not need flood process, only needs to send to SDN controller.
When SDN switching equipment is not adjacent with SDN controller, the ospf protocol of employing standard cannot send link-state information, now, can according to the IP address of pre-configured SDN controller, using this IP address as object IP address, by the mode of unicast message, link-state information is sent to SDN controller.Wherein, the IP address of SDN controller can on SDN switching equipment manual configuration, or issue configuration information to SDN switching equipment by SDN controller.
SDN controller is after receiving all link-state informations, reject the link-state information between SDN controller and SDN switching equipment collected, only calculate the network topology between SDN switching equipment, but do not need, according to standard agreement requirement computing network topology immediately, calculating to be triggered when there being business demand.In addition, because SDN controller only needs to collect topology information, after the link-state information receiving SDN switching equipment, do not need to require to flood to other SDN switching equipment according to the ospf protocol of standard.
Now still for SDN shown in Fig. 1, introduce the processing procedure that SDN link-state information is collected.
Suppose, the device identification of the device identification of SW1 to be the device identification of 1.1.1.1, SW2 be 2.2.2.2, SW3 is the device identification of 3.3.3.3, SDN controller is 4.4.4.4.For SW1, SW1 receives the hello packet of SDN controller, SW2 and SW3 respectively, according to receiving the device identification of carrying in the interface of hello packet and hello packet, sets up the corresponding relation of interface and device identification, namely the link-state information of each interface of SW1 is generated, in table 1.
Table 1
In like manner, the link-state information generated in SW2, in table 2.
Table 2
The link-state information generated in SW3, in table 3.
Table 3
The link-state information of generation is sent to SDN controller by SW1, SW2 and SW3, and be all neighbouring relations with SDN controller due to SW1, SW2, link-state information is sent to SDN controller by the ospf protocol message by standard.And SW3 and SDN controller is non-conterminous, ospf protocol in SW3 only runs to 2-Way state, link-state information cannot be sent by follow-up ospf protocol message, but SW3 (can be supposed by the IP address of pre-configured SDN controller, the IP address of SDN controller is 220.208.2.10), using the object IP address of 220.208.2.10 as message, send link-state information to SDN controller.
After above-mentioned link-state information collected by SDN controller, reject the link-state information relevant to oneself (device identification is 4.4.4.4), only generate the network topology structure of SW1, SW2 and SW3, namely the interface S2 of interface S1 and the SW2 of SW1 is connected, and the interface S1 of interface S2 and the SW3 of SW1 is connected.
Corresponding with the embodiment of aforementioned SDN link-state information collection method, the application also provides the embodiment of SDN link-state information gathering-device.
The embodiment of the application SDN link-state information gathering-device can be applied on SDN switching equipment.Device embodiment can pass through software simulating, also can be realized by the mode of hardware or software and hardware combining.For software simulating, as the device on a logical meaning, be by the CPU of its place equipment, computer program instructions corresponding in nonvolatile memory is read operation in internal memory to be formed.Say from hardware view; as shown in Figure 4; for a kind of hardware structure diagram of the application SDN link-state information gathering-device place equipment, except the CPU shown in Fig. 4, internal memory and nonvolatile memory, in embodiment, the equipment at device place can also comprise other hardware usually.
Please refer to Fig. 5, is the structural representation of the SDN link-state information gathering-device in the application's embodiment.This SDN link-state information gathering-device comprises: mark acquiring unit 501, information generating unit 502 and information transmitting unit 503, wherein:
Mark acquiring unit 501, for obtaining the device identification of each adjacent S DN equipment;
Information generating unit 502, for link generation state information, described link-state information comprises the corresponding relation of the interface of the device identification getting described adjacent S DN equipment and the device identification of described adjacent S DN equipment;
Information transmitting unit 503, for sending described link-state information to SDN controller, collects all link-state informations in described SDN to make described SDN controller.
Described mark acquiring unit 501, can specifically comprise: message receiver module and identifier acquisition module, wherein:
Message receiver module, for receiving the neighbor uni-cast message that adjacent S DN equipment sends;
Identifier acquisition module, for obtaining the device identification of described adjacent S DN equipment from described neighbor uni-cast message.
Described mark acquiring unit 501, specifically can also comprise agreement and start module, wherein:
Agreement starts module, for receive neighbor uni-cast message that adjacent S DN equipment sends at described message receiver module before, and the ospf protocol that starts in described SDN switching equipment that Open Shortest Path First;
Described neighbor uni-cast message is the hello packet of ospf protocol.
Described information transmitting unit 503, can specifically comprise: adjacent judge module and information sending module, wherein:
Adjacent judge module, for the device identification according to each the adjacent S DN equipment obtained, judges whether adjacent with described SDN controller;
Information sending module, for when adjacent with described SDN controller, sends described link-state information by multicast message to described SDN controller.
Described information transmitting unit 503, can also specifically comprise: address acquisition module and information sending module, wherein:
Address acquisition module, for when not adjacent with described SDN controller, obtains the IP address of pre-configured SDN controller;
Described information sending module, also for the IP address according to described SDN controller, sends described link-state information by unicast message to described SDN controller.
The embodiment of the SDN link-state information gathering-device shown in above-mentioned Fig. 5 can be applied in SDN switching equipment.Its specific implementation process see the explanation of preceding method embodiment, can not repeat them here.
As can be seen from the embodiment of above method and apparatus, collecting agreement by running three etale topologies on SDN equipment, making SDN controller directly can get the link-state information of all SDN switching equipment in SDN.The method is simple, improves the collection efficiency of network topological information.
The foregoing is only the preferred embodiment of the application, not in order to limit the application, within all spirit in the application and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.
Claims (10)
1. a software defined network SDN link-state information collection method, be applied to the SDN switching equipment in SDN, it is characterized in that, the method comprises:
Obtain the device identification of each adjacent S DN equipment;
Link generation state information, described link-state information comprises the corresponding relation of the interface of the device identification getting described adjacent S DN equipment and the device identification of described adjacent S DN equipment;
Send described link-state information to SDN controller, collect all link-state informations in described SDN to make described SDN controller.
2. the method for claim 1, is characterized in that, the device identification of each adjacent S DN equipment of described acquisition, comprising:
Receive the neighbor uni-cast message that adjacent S DN equipment sends;
The device identification of described adjacent S DN equipment is obtained from described neighbor uni-cast message.
3. method as claimed in claim 2, is characterized in that, before the neighbor uni-cast message that described reception adjacent S DN equipment sends, also comprises:
Open Shortest Path First ospf protocol is started in described SDN switching equipment;
Described neighbor uni-cast message is the hello packet of ospf protocol.
4. the method for claim 1, is characterized in that, describedly sends described link-state information to SDN controller, comprising:
According to the device identification of each the adjacent S DN equipment obtained, judge whether adjacent with described SDN controller;
When adjacent with described SDN controller, send described link-state information by multicast message to described SDN controller.
5. method as claimed in claim 4, is characterized in that, also comprise:
When not adjacent with described SDN controller, obtain the IP address of pre-configured SDN controller;
According to the IP address of described SDN controller, send described link-state information by unicast message to described SDN controller.
6. a software defined network SDN link-state information gathering-device, be applied to the SDN switching equipment in SDN, it is characterized in that, this device comprises:
Mark acquiring unit, for obtaining the device identification of each adjacent S DN equipment;
Information generating unit, for link generation state information, described link-state information comprises the corresponding relation of the interface of the device identification getting described adjacent S DN equipment and the device identification of described adjacent S DN equipment;
Information transmitting unit, for sending described link-state information to SDN controller, collects all link-state informations in described SDN to make described SDN controller.
7. device as claimed in claim 6, it is characterized in that, described mark acquiring unit, comprising:
Message receiver module, for receiving the neighbor uni-cast message that adjacent S DN equipment sends;
Identifier acquisition module, for obtaining the device identification of described adjacent S DN equipment from described neighbor uni-cast message.
8. device as claimed in claim 7, it is characterized in that, described mark acquiring unit, also comprises:
Agreement starts module, for receive neighbor uni-cast message that adjacent S DN equipment sends at described message receiver module before, and the ospf protocol that starts in described SDN switching equipment that Open Shortest Path First;
Described neighbor uni-cast message is the hello packet of ospf protocol.
9. device as claimed in claim 6, it is characterized in that, described information transmitting unit, comprising:
Adjacent judge module, for the device identification according to each the adjacent S DN equipment obtained, judges whether adjacent with described SDN controller;
Information sending module, for when adjacent with described SDN controller, sends described link-state information by multicast message to described SDN controller.
10. device as claimed in claim 9, it is characterized in that, described information transmitting unit, also comprises:
Address acquisition module, for when not adjacent with described SDN controller, obtains the IP address of pre-configured SDN controller;
Described information sending module, also for the IP address according to described SDN controller, sends described link-state information by unicast message to described SDN controller.
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