CN104283722B - SDN link-state informations collection method and device - Google Patents
SDN link-state informations collection method and device Download PDFInfo
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Abstract
The application provides a kind of software defined network SDN link-state informations collection method and device, and applied to the SDN switching equipment in SDN network, this method includes：Obtain the device identification of each adjacent S DN equipment；Link-state information is generated, the link-state information includes the interface for the device identification for getting the adjacent S DN equipment and the correspondence of the device identification of the adjacent S DN equipment；The link-state information is sent to SDN controllers, so that the SDN controllers are collected into all link-state informations in the SDN network.The SDN link-state information collection methods of the application are simple and practicable, effectively increase the collection efficiency of SDN network topology information.
Description
Technical field
The present invention relates to network communication technology field, more particularly to a kind of SDN link-state informations collection method and device.
Background technology
SDN (Software Defined Networks, software defined network) is a kind of new network of Emulex network innovation framework, is led to
Cross control plane and data planar separation, realize the flexible control of network traffics.Applied to the SDN equipment bags in SDN network
Include SDN controllers and SDN switching equipment.SDN controllers are responsible for collection network topology information, calculate the forwarding road of service message
Footpath, the forwarding flow table control business message that SDN switching equipment are issued according to SDN controllers forward.
At present, the collection of SDN network topology information uses LLDP (Link Layer Discovery Protocol, link
Layer finds agreement) agreement, the network topological information that SDN controllers are got by the agreement is physical topology information；Further according to
The information exchange of SDN controllers and SDN switching equipment obtains three layers of configuration information of switching equipment, by physical topology information and respectively
Three layers of configuration information of a switching equipment are combined, and realize the collection to three etale topology information of network.
It is above-mentioned three etale topology information of network is converted to from physical topology information collection method it is comparatively laborious, efficiency is low, and
And the SDN equipment of each producer is when carrying out configuration information interaction, often using proprietary protocol, poor expandability.
The content of the invention
In view of this, this application provides a kind of software defined network SDN link-state information collection methods, it is applied to
SDN switching equipment in SDN network, this method include：
Obtain the device identification of each adjacent S DN equipment；
Link-state information is generated, the link-state information includes the device identification for getting the adjacent S DN equipment
Interface and the adjacent S DN equipment device identification correspondence；
The link-state information is sent to SDN controllers, so that the SDN controllers are collected into the SDN network
All link-state informations.
Present invention also provides a kind of software defined network SDN link-state information collection devices, applied in SDN network
SDN switching equipment, which includes：
Mark acquiring unit, for obtaining the device identification of each adjacent S DN equipment；
Information generating unit, for generating link-state information, the link-state information is described adjacent comprising getting
The interface of the device identification of SDN equipment and the correspondence of the device identification of the adjacent S DN equipment；
Information transmitting unit, for sending the link-state information to SDN controllers, so that the SDN controllers are received
Collect all link-state informations in the SDN network.
In this application, agreement is collected by running three etale topologies in SDN equipment so that SDN controllers can be direct
Get the link-state information of all SDN switching equipment in SDN network.This method is simple and practicable, improves network topology letter
The collection efficiency of breath.
Brief description of the drawings
Fig. 1 is SDN network structure diagram；
Fig. 2 is standard ospf protocol state machine diagram；
Fig. 3 is the process chart of SDN link-state information collection methods in a kind of embodiment of the application；
Fig. 4 is the underlying hardware schematic diagram of SDN link-state information collection devices in a kind of embodiment of the application；
Fig. 5 is the structure diagram of SDN link-state information collection devices in a kind of embodiment of the application.
Embodiment
For the object, technical solution and advantage of the application are more clearly understood, referring to the drawings to herein described
Scheme is described in further detail.
Fig. 1 show SDN network structure diagram.SDN equipment in SDN network includes SDN controllers and SDN is exchanged and set
Standby (SW1, SW2 and SW3).The prior art is collected using physical topology information when carrying out SDN topology information collections and assisted
View, SDN controllers need to combine three layers of configuration information of SDN switching equipment, physical topology information are converted to three etale topology information,
The transfer process is complicated, and efficiency is low.
In view of the above-mentioned problems, the embodiment of the present application proposes a kind of SDN link-state informations collection method, by being set in SDN
Standby upper three etale topology information of directly running collect agreement, SDN controllers is directly obtained all SDN in SDN network and hand over
The link-state information of exchange device, so as to fulfill the collection of three etale topology information.
The embodiment of the present application is with OSPF (Open Shortest Path First, ospf) agreement
Example, the collection of three etale topology information is realized by the extension to ospf protocol.Ospf protocol is an Interior Gateway Protocol, is used for
Decision-making is route in single autonomous system.Believed between the equipment of operation ospf protocol by ospf protocol MESSAGE EXCHANGE link state
Breath.
Referring to Fig. 2, it is standard ospf protocol state machine diagram, shows that the network equipment of operation standard ospf protocol exists
Carry out each state passed through during link-state information interaction.Wherein, Down (original state) represents to go back between the network equipment
Do not start to exchange information, at this point it is possible to send hello packet (neighbours have found message), establish neighborhood；Attempt is (middle
State 1) and Init (intermediateness 2) be intermediateness, the intermediateness that network type difference is passed through also can be different, the state
For transitory state, the session of LA Management Room under this state is not set up also；2-Way (session establishment state) represents LA Management Room
Bi-directional session established, formed neighborhood, link-state information has generated in this case；ExStart (information exchanges
Original state) be information exchange before preparation stage, establish master slave relation between the network equipment；Exchange (information exchanges
State) represent the network equipment between link exchange status information summary info；Loading (information stress state), which represents to work as, to be had
When new link-state information needs loading, the link-state information new to peer network device request of loading；Full is (completely adjacent
Connect state) represent that link-state information has loaded completions, the synchronization of the Link State Database between the network equipment.
Be one embodiment flow chart of the application SDN link-state information collection methods referring to Fig. 3, the embodiment from
Collection process of the SDN switching equipment side to SDN link-state informations is described.
Step 310, the device identification of each adjacent S DN equipment is obtained.
First, ospf protocol is started in all SDN equipment in SDN network, SDN equipment passes through hair under Down states
Hello packet is sent to find neighbours.In the embodiment of the present application, when SDN switching equipment receive the Hello reports of adjacent S DN equipment transmission
Wen Shi, can get the device identification of adjacent S DN equipment from hello packet, the device identification for adjacent S DN equipment only
One identity.
Step 320, link-state information is generated, the link-state information includes and gets the adjacent S DN equipment
The interface of device identification and the correspondence of the device identification of the adjacent S DN equipment.
After SDN switching equipment get the device identification of adjacent S DN equipment by hello packet, into 2-Way states,
In this condition according to the interface and the equipment of the adjacent S DN equipment got from the hello packet for receiving hello packet
Mark, establishes interface and the correspondence of the device identification of adjacent S DN equipment, i.e. generation is believed for the link state of the interface
Breath.By taking SW1 shown in Fig. 1 as an example, SW1 receives the hello packet of SW2 transmissions on interface S1, is obtained from hello packet
The device identification (for example, 1.1.1.1) of SW2, establishes the correspondence of S1 and device identification (1.1.1.1), and SW1 knows that SW2 is
Neighbouring device, is connected on S1 interfaces.SDN switching equipment obtain total interface by carrying out above-mentioned processing to each interface
Link-state information.
As it can be seen that the link state that SDN switching equipment under 2-Way states, have generated for describing network topology is believed
Breath.In SDN network, SDN controllers are responsible for the calculating of service message forward-path, and only SDN controllers need to know the whole network
Link-state information, link exchange status information and path computing are not required between SDN switching equipment.Therefore, SDN is exchanged
The ospf protocol run between equipment stops continuing to change forward under 2-Way states, no longer carries out follow-up link state letter
Breath exchanges.The embodiment of the present application reduces agreement operand by running part ospf protocol between SDN switching equipment.
Step 330, send the link-state information to SDN controllers so that the SDN controllers be collected into it is described
All link-state informations in SDN network.
Local link-state information is sent to by SDN switching equipment after the local all link-state informations of generation
SDN controllers, so that the link state letter that all SDN switching equipment of the SDN controllers in the SDN network being collected into are sent
Breath is forwarded to path computing.
Since SDN switching equipment are different from the connection relation of SDN controllers, it believes to SDN controller transmission links state
The mode of breath is also different.Known SDN switching equipment can obtain setting for adjacent S DN equipment by hello packet in step 210
Standby mark, knows SDN equipment adjacent thereto.Therefore, SDN switching equipment can inquire about all devices mark locally preserved,
Judge whether SDN switching equipment are adjacent with SDN controllers.According to the connection relation of SDN switching equipment and SDN controllers, SDN is handed over
Exchange device can be by following two modes to SDN controller transmission link status informations.
When SDN switching equipment are adjacent with SDN controllers, the operation standard between SDN switching equipment and SDN controllers
Ospf protocol, protocol status run to Full states always, complete the link between SDN controllers and adjacent S DN switching equipment
State information exchange.SDN switching equipment by multicast message LSU (Link State Update, link state update) messages to
SDN controller transmission link status informations.Since SDN switching equipment only need link-state information being sent to SDN controllers,
Therefore, SDN switching equipment are in transmission link status information, it is not necessary to flood process, it is only necessary to are sent to SDN controllers.
, can not transmission link state letter using the ospf protocol of standard when SDN switching equipment are not adjacent with SDN controllers
Breath, at this point it is possible to according to the IP address of preconfigured SDN controllers, by IP address IP address as a purpose, passes through unicast
The mode of message, SDN controllers are sent to by link-state information.Wherein, the IP address of SDN controllers can be exchanged in SDN
Manual configuration in equipment, or configuration information is issued by SDN controllers and gives SDN switching equipment.
SDN controllers are rejected the SDN controllers being collected into and are exchanged with SDN after all link-state informations are received
Link-state information between equipment, only calculates the network topology between SDN switching equipment, but need not be wanted according to standard agreement
Calculating network topology immediately is sought, calculating can be triggered when there is business demand.Further, since SDN controllers only need to collect topology
Information, after the link-state information of SDN switching equipment is received, it is not necessary to which the ospf protocol according to standard is required to other SDN
Switching equipment floods.
Now still by taking SDN network shown in Fig. 1 as an example, the processing procedure of SDN link-state informations collection is introduced.
It is assumed that the device identification of SW1 is 1.1.1.1, the device identification of SW2 is 2.2.2.2, and the device identification of SW3 is
3.3.3.3, the device identification of SDN controllers is 4.4.4.4.By taking SW1 as an example, SW1 be respectively received SDN controllers, SW2 and
The hello packet of SW3, according to the device identification carried in the interface and hello packet that receive hello packet, establishes interface
With the correspondence of device identification, that is, the link-state information of each interface of SW1 is generated, is shown in Table 1.
Table 1
Similarly, the link-state information generated in SW2, is shown in Table 2.
Table 2
The link-state information generated in SW3, is shown in Table 3.
Table 3
The link-state information of generation is sent to SDN controllers by SW1, SW2 and SW3, due to SW1, SW2 and SDN
Controller is neighbouring relations, link-state information can be sent to SDN controllers by the ospf protocol message of standard.And SW3
Non-conterminous with SDN controllers, the ospf protocol in SW3 only runs to 2-Way states, can not pass through follow-up ospf protocol message
Transmission link status information, but SW3 can be by the IP address of preconfigured SDN controllers (it is assumed that the IP of SDN controllers
Address is 220.208.2.10), the purpose IP address using 220.208.2.10 as message, to SDN controller transmission link shapes
State information.
After SDN controllers are collected into above-mentioned link-state information, reject relevant with oneself (device identification 4.4.4.4)
Link-state information, only generates the network topology structure of SW1, SW2 and SW3, i.e. the interface S2 phases of the interface S1 and SW2 of SW1
Even, the interface S1 of the interface S2 and SW3 of SW1 are connected.
Corresponding with the embodiment of foregoing SDN link-state informations collection method, the application also provides SDN link states letter
Cease the embodiment of collection device.
The embodiment of the application SDN link-state information collection devices can be applied on SDN switching equipment.Device is implemented
Example can be realized by software, can also be realized by way of hardware or software and hardware combining.Exemplified by implemented in software, as
Device on one logical meaning, is by corresponding computer program in nonvolatile memory by the CPU of equipment where it
Instruction reads what operation in memory was formed.For hardware view, as shown in figure 4, being received for the application SDN link-state informations
A kind of hardware structure diagram of equipment where acquisition means, it is real in addition to the CPU shown in Fig. 4, memory and nonvolatile memory
Other hardware can also usually be included by applying the equipment in example where device.
Fig. 5 is refer to, is the structure diagram of the SDN link-state information collection devices in the application one embodiment.
The SDN link-state information collection devices include：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 generating link-state information, the link-state information includes and gets the phase
The interface of the device identification of adjacent SDN equipment and the correspondence of the device identification of the adjacent S DN equipment；
Information transmitting unit 503, for sending the link-state information to SDN controllers, so that the SDN controllers
All link-state informations being collected into the SDN network.
The mark acquiring unit 501, can specifically include：Message receiving module and identifier acquisition module, wherein：
Message receiving module, the neighbours for receiving the transmission of adjacent S DN equipment have found message；
Identifier acquisition module, for finding to obtain the device identification of the adjacent S DN equipment in message from the neighbours.
The mark acquiring unit 501, can also specifically include agreement starting module, wherein：
Agreement starting module, the neighbours for receiving the transmission of adjacent S DN equipment in the message receiving module have found message
Before, Open Shortest Path First ospf protocol is started in the SDN switching equipment；
The neighbours have found the hello packet that message is ospf protocol.
Described information transmitting element 503, can specifically include：Adjacent judgment module and information sending module, wherein：
Adjacent judgment module, for the device identification of each adjacent S DN equipment according to acquisition, judge whether with it is described
SDN controllers are adjacent；
Information sending module, for when adjacent with the SDN controllers, by multicast message to the SDN controllers
Send the link-state information.
Described information transmitting element 503, can also specifically include：Address acquisition module and information sending module, wherein：
Address acquisition module, for when not adjacent with the SDN controllers, obtaining preconfigured SDN controllers
IP address；
Described information sending module, is additionally operable to the IP address according to the SDN controllers, by unicast message to described
SDN controllers send the link-state information.
The embodiment of SDN link-state information collection devices shown in above-mentioned Fig. 5 can be applied in SDN switching equipment.
Its specific implementation process can be found in the explanation of preceding method embodiment, and details are not described herein.
As can be seen that collecting association by running three etale topologies in SDN equipment from above method and the embodiment of device
View so that SDN controllers can be directly obtained the link-state information of all SDN switching equipment in SDN network.This method letter
It is single easy, improve the collection efficiency of network topological information.
The foregoing is merely the preferred embodiment of the application, not limiting the application, all essences in the application
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of the application protection.
Claims (6)
- A kind of 1. software defined network SDN link-state information collection methods, applied to the SDN switching equipment in SDN network, institute Stating the SDN equipment in SDN network includes SDN switching equipment and SDN controllers, and the SDN equipment runs open type shortest path Preferential ospf protocol, it is characterised in that this method includes：Obtain the device identification of each adjacent S DN equipment；Link-state information is generated, the link-state information connects comprising the device identification for getting the adjacent S DN equipment Mouth and the correspondence of the device identification of the adjacent S DN equipment；Inquire about in the device identification of the adjacent S DN equipment got and whether include the device identification of SDN controllers, to judge whether It is adjacent with the SDN controllers；When not adjacent with the SDN controllers, the IP address of preconfigured SDN controllers is obtained；Controlled according to the SDN The IP address of device, the link-state information is sent by unicast message to the SDN controllers；When adjacent with the SDN controllers, interacted to the SDN and controlled by the ospf protocol between the SDN controllers Device processed sends the link-state information, so that the SDN controllers are collected into all link states letter in the SDN network Breath.
- 2. the method as described in claim 1, it is characterised in that the device identification for obtaining each adjacent S DN equipment, bag Include：Receive the neighbours that adjacent S DN equipment is sent and find message；Find to obtain the device identification of the adjacent S DN equipment in message from the neighbours.
- 3. method as claimed in claim 2, it is characterised in that the neighbours that the reception adjacent S DN equipment is sent have found message Before, further include：Start Open Shortest Path First ospf protocol in the SDN switching equipment；The neighbours have found the hello packet that message is ospf protocol.
- A kind of 4. software defined network SDN link-state information collection devices, applied to the SDN switching equipment in SDN network, institute Stating the SDN equipment in SDN network includes SDN switching equipment and SDN controllers, and the SDN equipment runs open type shortest path Preferential ospf protocol, it is characterised in that the device includes：Mark acquiring unit, for obtaining the device identification of each adjacent S DN equipment；Information generating unit, for generating link-state information, the link-state information, which includes, to be got the adjacent S DN and sets The interface of standby device identification and the correspondence of the device identification of the adjacent S DN equipment；Information transmitting unit, for whether including setting for SDN controllers in inquiring about the device identification of the adjacent S DN equipment got Standby mark is adjacent with the SDN controllers to judge whether；When not adjacent with the SDN controllers, obtain preconfigured The IP address of SDN controllers；According to the IP address of the SDN controllers, institute is sent to the SDN controllers by unicast message State link-state information；When adjacent with the SDN controllers, interacted by the ospf protocol between the SDN controllers The link-state information is sent to the SDN controllers, so that the SDN controllers are collected into the institute in the SDN network There is link-state information.
- 5. device as claimed in claim 4, it is characterised in that the mark acquiring unit, including：Message receiving module, the neighbours for receiving the transmission of adjacent S DN equipment have found message；Identifier acquisition module, for finding to obtain the device identification of the adjacent S DN equipment in message from the neighbours.
- 6. device as claimed in claim 5, it is characterised in that the mark acquiring unit, further includes：Agreement starting module, before the neighbours for receiving the transmission of adjacent S DN equipment in the message receiving module have found message, Start Open Shortest Path First ospf protocol in the SDN switching equipment；The neighbours have found the hello packet that message is ospf protocol.
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| US9860350B2 (en) | 2015-05-12 | 2018-01-02 | Huawei Technologies Co., Ltd. | Transport software defined networking (SDN)—logical to physical topology discovery |
| US10015053B2 (en) | 2015-05-21 | 2018-07-03 | Huawei Technologies Co., Ltd. | Transport software defined networking (SDN)—logical link aggregation (LAG) member signaling |
| US10425319B2 (en) | 2015-05-21 | 2019-09-24 | Huawei Technologies Co., Ltd. | Transport software defined networking (SDN)—zero configuration adjacency via packet snooping |
| CN106411549A (en) * | 2015-07-30 | 2017-02-15 | 中兴通讯股份有限公司 | Processing method and apparatus of layer adjacency automatic discovery |
| CN105591937B (en) * | 2015-09-30 | 2018-12-25 | 新华三技术有限公司 | A kind of acquisition method and equipment of network topological information |
| CN106330536A (en) * | 2016-08-22 | 2017-01-11 | 华南理工大学 | Method for acquiring network state information of wmSDN |
| CN106953742A (en) * | 2017-02-16 | 2017-07-14 | 广州海格通信集团股份有限公司 | A kind of wireless isomer network bandwidth safeguard method based on SDN |
| CN110167032A (en) * | 2019-04-30 | 2019-08-23 | 陕西师范大学 | The network-building method and system of the software definition wireless self-organization network of unmanned aerial vehicle (UAV) control |
| CN112422428B (en) * | 2020-11-09 | 2022-05-17 | 迈普通信技术股份有限公司 | Link state acquisition method and device, electronic equipment and readable storage medium |
| CN115348153B (en) * | 2022-08-15 | 2023-07-18 | 中国联合网络通信集团有限公司 | Control method, device, equipment and storage medium of forwarding equipment |
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