CN110430114A - A kind of virtual router and the method for realizing SDN network and traditional IP interconnection - Google Patents

A kind of virtual router and the method for realizing SDN network and traditional IP interconnection Download PDF

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Publication number
CN110430114A
CN110430114A CN201910673008.7A CN201910673008A CN110430114A CN 110430114 A CN110430114 A CN 110430114A CN 201910673008 A CN201910673008 A CN 201910673008A CN 110430114 A CN110430114 A CN 110430114A
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interface
protocol
sdn
module
sdn controller
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CN110430114B (en
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李勇
王炜发
杨灿
党百振
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CETC 7 Research Institute
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CETC 7 Research Institute
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • H04L12/4641Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • H04L12/4641Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H04L12/4675Dynamic sharing of VLAN information amongst network nodes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/08Protocols for interworking; Protocol conversion

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention discloses a kind of virtual routers, it is characterised in that: including SDN controller, kernel module, protocol module;The SDN controller: to the northbound interface of upper offer standard, the flow table configuration-direct of application and the message data of protocol module are carried out OF protocol encapsulation by SDN controller module, and be forwarded at corresponding interface and handle;To the southbound interface of lower offer standard;The kernel module: shielding bottom provides the IP layer and interface of standard for the operation of upper-layer protocol;And complete the communication adaptation between IP kernel message and SDN controller;The protocol module: for handling traditional standard router protocol, corresponding routing table, forwarding table are formed, and SDN controller is informed by routing engine module, is generated flow entry according to routing table, forwarding table by SDN controller, and carry out issuing processing.The present invention is able to achieve SDN network and traditional network interconnected communication.

Description

A kind of virtual router and the method for realizing SDN network and traditional IP interconnection
Technical field
The present invention relates to fields of communication technology, more particularly to a kind of virtual router and realization SDN network and tradition The method of IP network interconnection.
Background technique
Legacy network devices are individually controlled by equipment, and each equipment should complete forwarding surface function, complete control again Face processed and chain of command function complete networking by interactive controlling signaling between equipment.
Firstly, being difficult to carry out resource tune from the angle of the whole network on web impact factor and service quality guarantee in traditional network Whole and control;Secondly on forward mode, legacy network devices are substantially fixation, i.e., carry out routing according to target ip address Forwarding, can not be according to every progress comprehensive matching forwarding in MAC, IP, TCP/UDP;Furthermore legacy network devices are to net What network manager was presented is black box mode, the state and the method for operation of network be all the agreement that carries of these network device itselfs from Dynamic completion, network manager can not intervene at all;In addition in economic benefit, the completion of network function in traditional network, The participation of software in equipment is needed, the application of new technology each time requires to carry out the upgrading or replacement of equipment.
With technology development and evolution, the extensive use of the technologies such as network virtualization, big data and cloud computing, traditional net Network framework has been difficult to be competent at, and SDN network is come into being.
SDN network includes SDN controller and edge SDN switch, and SDN network main feature includes following several respects:
A) control and forward separating;
B) centralized network-control;
C) open standard programmable interface.
Networking mainly passes through the flow table forwarding between SDN controller control internal switch nodes inside SDN network;For big Scale network, can carry out region division to SDN network, and a SDN controller controls a region.The east of controller is crossed by whole Netcom West constructs controller cluster to interface inter-link, selects higher level controller, realizes and controls each controller, and completes complete Network control system.
Currently, traditional network is applied on a large scale, and SDN network is as emerging network, be necessarily required to it is existing Traditional network interconnected, intercommunication, interoperability.
Since in SDN network framework, interchanger no longer parses any agreement, flow table matching and forwarding, control are only done Mode is all needed to be sent on controller and be parsed using centralization, all protocol analysis, and flow table issuance is also unified under controller Hair.SDN controller is only responsible for the parsing and encapsulation of agreement, and SDN internal network, using the control of centralization, inside is no longer deposited In interface IP address, Routing Protocol etc., therefore works as SDN network and need to need with existing IP network routing device in protocol level When intercommunication, exist because can not be with the ARP protocol, Routing Protocol, MPLS label retransmission protocol intercommunication of standard the problems such as, it is difficult To be used together with existing network fusion, this is a kind of challenge to transitional SDN technology is in.
The research of SDN technology is concentrated mainly on the cluster application etc. between SDN internal network and multiple domain SDN network at present, It is inadequate to SDN network and traditional network interconnection and mixed networking research.
Summary of the invention
The present invention provides a kind of void to solve the problems, such as that traditional IP cannot be interconnected directly with SDN network Quasi- router and the method for realizing SDN network and traditional IP interconnection realize SDN network by building virtual router With Traditional IP interconnected communication.
To realize aforementioned present invention purpose, the technical solution adopted is as follows: a kind of virtual router, including SDN controller, Kernel module, protocol module;
The SDN controller: to the northbound interface of upper offer standard, the flow table configuration-direct of application and protocol module Message data carries out OF protocol encapsulation by SDN controller module, and is forwarded at corresponding interface and handles;To lower offer standard Southbound interface;
The kernel module: shielding bottom provides the IP layer and interface of standard for the operation of upper-layer protocol;And it completes in IP Communication adaptation between core message and SDN controller;
The protocol module: for handling traditional standard router protocol, corresponding routing table, forwarding are formed Table, and SDN controller is informed by routing engine module, flow entry is generated according to routing table, forwarding table by SDN controller, and It carries out issuing processing.
Preferably, the kernel module is configured with NetLink adaptation module, for completing the mapping of virtual IP interface.
Further, it is suitable to IP kernel interface data interaction to be also used to complete SDN controller for the NetLink adaptation module Match, provides protocol module unified standardization IP interface by IP inner nuclear layer, the protocol data received from SDN controller passes through NETLINK adaptable interface is sent to IP inner nuclear layer.
Still further, the protocol module use Quagga consultative management module, can pass through standard Socket interface from IP inner nuclear layer receives protocol massages.
Still further, the traditional standard router protocol includes unicast routing protocol, multicast routing protocol, MPLS association View, the protocol module respectively correspond unicast routing protocol, multicast routing protocol, mpls protocol to form unicast routing table, group Broadcast forwarding table, MPLS label forwarding table.
Still further, the SDN controller deployment is on the control unit, described control unit includes computer, industry control Plate, server, cloud platform;SDN controller load operating in the form of software.
Based on above-described virtual router, the present invention also provides a kind of realization SDN network and traditional IP are mutual The method of connection, described this method include preparation process, interactive process, the specific steps are as follows:
Preparation process:
S101: the edge SDN switch in SDN network is attached with the conventional switch in traditional IP, is opened The conventional switch of dynamic traditional IP, and start ospf protocol on interconnecting interface;
S102: SDN network is virtually become to virtual router as described in any one of claims 1 to 6;
S103: constructing virtual interface mapping relations in the NetLink adaptation module of virtual router, and SDN network is external The interface that the interface mappings of presentation are externally presented at virtual router;
S104: starting ospf protocol on virtual router, externally sends ospf protocol by virtual interface;
Interactive process:
S201: virtual interface mapping relations are constructed in step S103, the kernel module of virtual router passes through SDN controller Southbound interface to edge SDN switch download flow table, complete SDN controller to edge SDN switch carry out flow table setting, and SDN controller is all sent to handle the protocol massages of all conventional switch;
S202: edge SDN switch receives the OSPF routing message of conventional switch transmission, is sent to by southbound interface The processing of SDN controller;
S203:SDN controller passes through virtual interface mapping relations pair according to the transmission address for including in message and interface number Virtual interface should be arrived, IP kernel message sent to by NetLink adaptation module in kernel module;
S204: protocol module receives the protocol massages of IP kernel transmission by routing engine module, and is sent to ospf protocol Module is handled;
S205:OSPF agreement obtains routing report by sending routing message to virtual interface in NetLink adaptation module Text, and the interface that corresponding interchanger is externally presented is found according to interface number and virtual interface mapping relations, message is sent to SDN control Device processed
S206:SDN controller is sent to OSPF message on the interface of corresponding edge SDN switch by northbound interface It sends.
Further, the transmitting-receiving process based on the OSPF routing message in above-mentioned protocol module, forms road for ospf protocol By table;Routing table is sent to the processing of SDN controller by protocol process module, and SDN controller first carries out routing table after receiving It is converted into flow entry;Flow entry is issued to corresponding edge SDN switch and executed by SDN controller.
Still further, the southbound interface includes flow table issuance to the execution of each edge SDN switch, OpenFlow agreement Encapsulation and parsing, the processing of standard ICP/IP protocol message.
Still further, the interface that the SDN network is externally presented is the external interface of each edge SDN switch, institute It states the external interface of each edge SDN switch and is mapped to a router interface on the virtual router.
SDN network is integrally invented a virtual router by the present invention, and virtual router is integrally externally rendered as one Standard router function.SDN network internal network is regarded as the interaction of virtual router internal information, can pass through pure SDN flow table The normal flow table matching exchange of network internal is realized in control;The external interconnecting interface of SDN network can be mapped as virtual router to external Mouthful, various conventional router agreements are run in virtual router, and protocol interaction is externally carried out by each external connection interface, it is this Under mode, SDN network can be disposed in the entire network in a manner of one common two layers or three-layer routing device, realize flattening Networking.
SDN network of the present invention is made of SDN controller and edge SDN switch, each SDN controller can More SDN switches are controlled, SDN controller completes the networking of SDN network internal standard.
SDN controller of the present invention is completed to control SDN network, and to edge SDN switch interface and protocol aware control Function processed.A virtual channel, such virtual router are established between the interface that SDN network is externally presented and SDN controller On network layer protocol the OF of virtual channel can be transferred through by the all-network layer protocol message that the virtual interface being adapted to is sent Agreement is sent on corresponding SDN switch interface, and corresponding IP kernel interface gives protocol module processing message transmission.Agreement The agreement of module operation can also transmit data to edge SDN switch interface, realization and external perimysium reference by virtual channel Protocol interaction between router.
Beneficial effects of the present invention are as follows:
1. the present invention proposes the concept of virtual router, SDN network is integrally invented a virtual standard router, The interface mappings that SDN network edge SDN switch is externally presented are the interface of virtual router, by constructing virtual channel, Direct-connected in logic between realization SDN controller and edge SDN switch, protocol massages can be carried out by the virtual channel to diplomacy Mutually.
2. method of the present invention can be realized SDN network and the seamless intercommunication of non-SDN network, including SDN network and non- Direct interconnection, multiple SDN network interconnection, multiple tradition non-SDN route-exchanging device and multiple of the edge of SDN network to edge The mixing of SDN network interconnects.
3. method of the present invention is simply easily realized, adaptation layer is constructed by NetLink, shielding bottom-layer network realizes machine System, provides the IP inner nuclear layer platform of standard, measured Quagga protocol process module directly dispose just be able to carry out with outside Portion's traditional network carries out the interaction of two or three layer protocols.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the present embodiment virtual router.
Fig. 2 is the present embodiment system structure diagram.
Fig. 3 is the flow chart that the present embodiment edge SDN switch receives protocol massages.
Fig. 4 is the flow chart that the present embodiment protocol module receives message from IP kernel.
Fig. 5 is the flow chart that the present embodiment protocol module list item issues.
Fig. 6 is the schematic diagram that SDN network is invented virtual router by the present embodiment.
Fig. 7 is the present embodiment virtual channel schematic diagram.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and detailed description.
Embodiment 1
As shown in Figure 1, a kind of virtual router, including SDN controller, kernel module, protocol module;
The SDN controller: to the northbound interface of upper offer standard, the flow table configuration-direct of application and protocol module Message data carries out OF protocol encapsulation by SDN controller module, and is forwarded at corresponding interface and handles;To lower offer standard Southbound interface;
The kernel module: shielding bottom provides the IP layer and interface of standard for the operation of upper-layer protocol;And it completes in IP Communication adaptation between core message and SDN controller;
The protocol module: the protocol module uses Quagga consultative management module, provides traditional standard router association Processing software function is discussed, unicast routing protocol (OSPF, RIP, EIGRP, BGP), the Multicast Routing association of traditional standard can be completed View, mpls protocol, are respectively formed unicast routing table, multicast forward table, MPLS label forwarding table, and accuse by routing engine module Know SDN controller, generates flow entry according to information such as routing table, forwarding tables by SDN controller, and issue processing.
Kernel module described in the present embodiment is configured with NetLink adaptation module, for completing the mapping of virtual IP interface.Institute It states NetLink adaptation module and is also used to complete SDN controller to IP kernel interface data interaction adaptation, by IP inner nuclear layer to association View module provides unified standardization IP interface, and the protocol data received from SDN controller is sent to by NETLINK adaptable interface IP inner nuclear layer.
Protocol module described in the present embodiment uses Quagga consultative management module, provides the agreement under standardized network interface Processing function can receive protocol massages from inner nuclear layer by standard Socket interface, and all general network protocols can be It is run well on IP inner nuclear layer.
SDN controller described in the present embodiment dispose on the control unit, described control unit include computer, industrial control board, Server, cloud platform;SDN controller load operating in the form of software.
Based on above-described virtual router, the present embodiment additionally provides a kind of realization SDN network and traditional IP The method of interconnection, the present embodiment are explained in detail with instance system as shown in Figure 2, and the instance system includes four exchanges Machine, wherein switch A, B are traditional three-tier switch, and interchanger C, D are SDN switch, SDN controller and interchanger C, D mono- It rises and constitutes SDN network.The interface 1 of SDN switch C is connected with conventional switch A, and the interface 4 of SDN switch D is exchanged with tradition Machine B connection.A' and B' is respectively terminal computer.
The method for realizing SDN network and traditional IP interconnection includes preparation process, interactive process, and specific steps are such as Under:
Preparation process:
S101: the edge SDN switch in SDN network is attached with the conventional switch in traditional IP, is opened The conventional switch of dynamic traditional IP, and start ospf protocol on interconnecting interface.As shown in Figure 2.
S102: SDN network is virtually become to the virtual router as above stated, as shown in Figure 2.
S103: constructing virtual interface mapping relations in the NetLink adaptation module of virtual router, and SDN network is external The interface that the interface mappings of presentation are externally presented at virtual router, as shown in Fig. 2, the present embodiment virtual router externally has two A virtual interface is respectively M and N, and wherein M interface IP address is 100.0.0.2, and the interface IP address of N is 200.0.0.2;That is M and N and The mapping relations of the interface 1 of entity edge SDN switch C, the interface 4 of D.
S104: starting ospf protocol on virtual router, externally sends ospf protocol by virtual interface;
Interactive process:
S201: virtual interface mapping relations are constructed in step S103, the kernel module of virtual router passes through SDN controller Southbound interface download flow table to SDN switch, complete SDN controller and flow table setting carried out to edge SDN switch, and by institute There are the protocol massages of conventional switch that SDN controller is all sent to handle;
Specifically, the kernel module of virtual router is issued by the southbound interface of SDN controller to SDN switch C and D Flow table, it is desirable that SDN switch receive all broadcast addresses, multicast address and destination address be 100.0.0.2 and 200.0.0.2 the Packet-In message in southbound interface agreement that message passes through SDN controller is sent to the processing of SDN controller.
S202: edge SDN switch C and D receive the OSPF routing message that traditional three-tier switch A and B is sent, and pass through The processing of SDN controller is sent in the encapsulation of Packet-In message, as shown in figure 3, edge SDN switch receives the process of protocol massages.
After S203:SDN controller receives SDN switch Packet-In message, according to the transmission address that includes in message and Interface number corresponds to virtual interface by virtual interface mapping relations, sends message in IP by NetLink adaptation module Core.
S204: it as shown in figure 4, protocol process module is waited in the enterprising traveling journey of kernel, is received by routing engine module The protocol massages of IP kernel transmission, the i.e. protocol massages of switch A and B brought, and it is sent to the association of the OSPF in protocol module It discusses module and carries out route processing.
S205: as shown in figure 5, the ospf protocol of Quagga consultative management simultaneously is by sending routing report to virtual interface Text obtains routing message in NetLink adaptation module, and finds corresponding exchange according to interface number and virtual interface mapping relations Message is sent to SDN controller by the interface that machine is externally presented;
S206:SDN controller is sent to OSPF message based on the northbound interface that Packet-Out message is controlled by SDN It is sent on the corresponding interface of corresponding edge SDN switch.
Transmitting-receiving process of the present embodiment based on the OSPF routing message in above-mentioned protocol module, ospf protocol is formed and is routed Table;Routing table is sent to the processing of SDN controller by protocol process module, and SDN controller first turns routing table after receiving Change flow entry into;SDN controller executes the flow table issuance of node C and node D to corresponding SDN switch.
Wherein, the routing table is as follows:
Destination address: B next-hop: B outgoing interface: N hop count: 1
Destination address: A next-hop: A outgoing interface: M hop count: 1
The SDN controller carries out routing table to be converted into flow entry, as follows:
Node C flow table:
Destination address: B next-hop: D outgoing interface: 2
Destination address: A next-hop: A outgoing interface: 1
Node D flow table:
Destination address: B next-hop: B outgoing interface: 4
Destination address: A next-hop: C outgoing interface: 3
The present embodiment is during practical traditional network and SDN network interconnect, when the service message of traditional network enters To after SDN network, SDN switch forwards the data to corresponding next-hop node according to flow table;
It is specific as follows:
D1: the Ping terminal B ' on terminal A ';
D2: conventional switch A issues next-hop 100.0.0.2, i.e. C node according to routing table, business;
D3: edge SDN switch C carries out matching forwarding according to the flow table of SDN controller, and data are turned
It is dealt into edge SDN switch D;
D4: edge SDN switch D carries out matching forwarding according to the flow table of SDN controller, and data are turned
It is dealt into 200.0.0.1, i.e. B node;
D5: conventional switch B execution conventional switch function forwards the data to terminal B ';
The inverse process of the present embodiment Ping terminal A ' on terminal B ' is similar, to realize that two-way Ping is logical.
Southbound interface described in the present embodiment includes flow table issuance to the execution of each SDN switch, the encapsulation of OpenFlow agreement With parsing, the processing of standard ICP/IP protocol message.
The interface that SDN network described in the present embodiment is externally presented is the external interface of each edge SDN switch, described every The external interface of a edge SDN switch is mapped to a router interface on the virtual router.
As shown in fig. 6, SDN network is integrally invented a virtual router by the present embodiment, virtual router is integrally right It is rendered as a standard router function outside.SDN network internal network is regarded as the interaction of virtual router internal information, can lead to It crosses pure SDN flow table control and realizes the normal flow table matching exchange of network internal;The external interconnecting interface of SDN network can be mapped as virtual road By device external interface, various conventional router agreements are run in virtual router, and externally assisted by each external connection interface View interacts, and under this mode, SDN network can be disposed in the entire network in a manner of one common two layers or three-layer routing device, Realize the networking of flattening.
SDN network described in the present embodiment is made of SDN controller and SDN switch, each SDN controller can be controlled More SDN switches are made, SDN controller completes the networking of SDN network internal standard.
The present embodiment SDN controller is completed to control SDN network, and to edge SDN switch interface and protocol aware Control function.As shown in fig. 7, a virtual channel is established between the interface that SDN network is externally presented and SDN controller, this Network layer protocol on sample virtual router can be transferred through by the all-network layer protocol message that the virtual interface being adapted to is sent The OF agreement of virtual channel is sent on corresponding SDN switch interface, and corresponding IP kernel interface gives agreement message transmission Resume module.The agreement of protocol module operation can also transmit data to edge SDN switch interface by virtual channel, real The now protocol interaction between external perimysium reference router.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair The restriction of embodiments of the present invention.Any modification done within the spirit and principles of the present invention and changes equivalent replacement Into etc., it should all be included in the scope of protection of the claims of the present invention.

Claims (10)

1. a kind of virtual router, it is characterised in that: including SDN controller, kernel module, protocol module;
The SDN controller: to the northbound interface of upper offer standard, the flow table configuration-direct of application and the message of protocol module Data carry out OF protocol encapsulation by SDN controller module, and are forwarded at corresponding interface and handle;To the south orientation of lower offer standard Interface;
The kernel module: shielding bottom provides the IP layer and interface of standard for the operation of upper-layer protocol;And complete IP kernel report Communication adaptation between text and SDN controller;
The protocol module: for handling traditional standard router protocol, forming corresponding routing table, forwarding table, and SDN controller is informed by routing engine module, is generated flow entry according to routing table, forwarding table by SDN controller, and carried out down Hair processing.
2. virtual router according to claim 1, it is characterised in that: the kernel module is adapted to configured with NetLink Module, for completing the mapping of virtual IP interface.
3. virtual router according to claim 2, it is characterised in that: the NetLink adaptation module is also used to complete SDN controller is adapted to IP kernel interface data interaction, is provided unified standardization IP to protocol module by IP inner nuclear layer and is connect Mouthful, the protocol data received from SDN controller is sent to IP inner nuclear layer by NETLINK adaptable interface.
4. virtual router according to claim 3, it is characterised in that: the protocol module uses Quagga consultative management Module can receive protocol massages from IP inner nuclear layer by standard Socket interface.
5. virtual router according to claim 4, it is characterised in that: the traditional standard router protocol includes unicast Routing Protocol, multicast routing protocol, mpls protocol, the protocol module assist unicast routing protocol, multicast routing protocol, MPLS View respectively corresponds to form unicast routing table, multicast forward table, MPLS label forwarding table.
6. virtual router according to claim 5, it is characterised in that: the SDN controller is disposed on the control unit, Described control unit includes computer, industrial control board, server, cloud platform;The SDN controller loads fortune in the form of software Row.
7. a kind of method for realizing SDN network and traditional IP interconnection, it is characterised in that: described this method includes preparing Journey, interactive process, the specific steps are as follows:
Preparation process:
S101: the edge SDN switch in SDN network is attached with the conventional switch in traditional IP, and starting passes The conventional switch of system IP network, and start ospf protocol on interconnecting interface;
S102: SDN network is virtually become to virtual router as described in any one of claims 1 to 6;
S103: virtual interface mapping relations are constructed in the NetLink adaptation module of virtual router, SDN network is externally presented The interface that is externally presented at virtual router of interface mappings;
S104: starting ospf protocol on virtual router, externally sends ospf protocol by virtual interface;
Interactive process:
S201: virtual interface mapping relations are constructed in step S103, the kernel module of virtual router passes through the south of SDN controller Flow table is downloaded to interface to edge SDN switch, SDN controller is completed and flow table setting is carried out to edge SDN switch, and by institute There are the protocol massages of conventional switch that SDN controller is all sent to handle;
S202: edge SDN switch receives the OSPF routing message of conventional switch transmission, is sent to SDN control by southbound interface Device processing processed;
S203:SDN controller is corresponded to according to the transmission address for including in message and interface number by virtual interface mapping relations Virtual interface, the IP kernel sent message to by NetLink adaptation module in kernel module;
S204: protocol module receives the protocol massages of IP kernel transmission by routing engine module, and is sent to ospf protocol module It is handled;
S205:OSPF agreement is by sending routing message to virtual interface, the acquisition routing message in NetLink adaptation module, And the interface that corresponding interchanger is externally presented is found according to interface number and virtual interface mapping relations, message is sent to SDN control Device
S206:SDN controller is sent to OSPF message on the interface of corresponding edge SDN switch by northbound interface and sends It goes out.
8. the method according to claim 7 for realizing SDN network and traditional IP interconnection, it is characterised in that: based on upper The transmitting-receiving process for stating the OSPF routing message in protocol module, forms routing table for ospf protocol;Protocol process module is routing Table is sent to the processing of SDN controller, and SDN controller first carries out routing table after receiving to be converted into flow entry;SDN controller handle Flow entry is issued to corresponding SDN switch and executes.
9. the method according to claim 7 for realizing SDN network and traditional IP interconnection, it is characterised in that: the south It include flow table issuance to the execution of each SDN switch, the encapsulation of OpenFlow agreement and parsing, standard ICP/IP protocol report to interface The processing of text.
10. the method according to claim 7 for realizing SDN network and traditional IP interconnection, it is characterised in that: described The interface that SDN network is externally presented is the external interface of each edge SDN switch, and each edge SDN switch is external Interface a router interface is mapped on the virtual router.
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