CN110430114B - Virtual router and method for realizing interconnection between SDN network and traditional IP network - Google Patents
Virtual router and method for realizing interconnection between SDN network and traditional IP network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
- H04L12/4675—Dynamic sharing of VLAN information amongst network nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
Abstract
The invention discloses a virtual router, which is characterized in that: the SDN system comprises an SDN controller, a kernel module and a protocol module; the SDN controller: providing a standard northbound interface for the upper part, carrying out OF protocol encapsulation on a flow table configuration instruction OF an application and message data OF a protocol module through an SDN controller module, and forwarding the OF protocol encapsulation to the corresponding interface for processing; a standard southbound interface is provided for the lower part; the kernel module is used for: the shielding bottom layer provides a standard IP layer and an interface for the operation of an upper layer protocol; and completing communication adaptation between the IP kernel message and the SDN controller; the protocol module: the SDN router is used for processing a traditional standard router protocol to form a corresponding routing table and a forwarding table, informing the SDN controller through a routing engine module, generating a flow table item by the SDN controller according to the routing table and the forwarding table, and issuing and processing the flow table item. The invention can realize the interconnection communication between the SDN network and the traditional network.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a virtual router and a method for realizing interconnection between an SDN network and a traditional IP network.
Background
The traditional network equipment is controlled individually equipment by equipment, each equipment not only needs to complete the forwarding plane function, but also needs to complete the control plane and management plane functions, and networking is completed among the equipment through interactive control signaling.
Firstly, in the traditional network, resource adjustment and control are difficult to be carried out from the perspective of the whole network in terms of network congestion control and service quality guarantee; secondly, in a forwarding mode, the traditional network equipment is basically fixed, namely, routing forwarding is carried out according to a target IP address, and comprehensive matching forwarding cannot be carried out according to each item in the MAC, the IP header and the TCP/UDP header; moreover, the traditional network equipment presents a black box mode to a network manager, the state and the running mode of the network are automatically completed by protocols carried by the network equipment, and the network manager cannot intervene at all; in addition, in terms of economic efficiency, the completion of network functions in the conventional network requires the participation of software in the equipment, and each time the new technology is applied, the equipment needs to be upgraded or replaced.
With the development and evolution of technologies, the wide application of technologies such as network virtualization, big data and cloud computing, the traditional network architecture is hard to be competent, and the SDN network comes up.
The SDN network comprises an SDN controller and an edge SDN switch, and the SDN network is mainly characterized by comprising the following aspects:
a) control and forwarding are separated;
b) centralized network control;
c) open standard programmable interfaces.
The SDN network internal networking mainly controls flow table forwarding between internal switching nodes through an SDN controller; for large-scale networks, the SDN network may be partitioned into zones, with one SDN controller controlling each zone. The whole network is interconnected through east-west interfaces of the controllers, a controller cluster is constructed, a controller with a higher level is selected, control over each controller is achieved, and full network control is completed.
At present, a traditional network is applied in a large scale, and as an emerging network, an SDN network necessarily needs to be interconnected, intercommunicated and interoperated with the existing traditional network.
In the SDN network architecture, the switch does not analyze any protocol any more, only flow table matching and forwarding are carried out, the control mode is centralized, all protocol analysis needs to be sent to the controller for analysis, and flow table issuing is unified from the controller. The SDN controller is only responsible for protocol analysis and encapsulation, and an SDN internal network adopts centralized management and control, and no interface IP address, routing protocol and the like exist in the SDN, so when the SDN needs to be communicated with the existing IP network routing equipment in a protocol layer, the SDN controller has the problems that the SDN cannot be communicated with the standard ARP protocol, routing protocol, MPLS label forwarding protocol and the like, and is difficult to be fused with the existing network for use, which is a challenge to the SDN technology in the transition period.
At present, research of the SDN technology mainly focuses on SDN internal networks, cluster application among multi-domain SDN networks and the like, and research on SDN networks and traditional network interconnection and hybrid networking is not enough.
Disclosure of Invention
The invention provides a virtual router and a method for realizing interconnection of an SDN network and a traditional IP network, aiming at solving the problem that the traditional IP network cannot be directly interconnected with the SDN network.
In order to achieve the purpose of the invention, the technical scheme is as follows: a virtual router comprises an SDN controller, a kernel module and a protocol module;
the SDN controller: providing a standard northbound interface for the upper part, carrying out OF protocol encapsulation on a flow table configuration instruction OF an application and message data OF a protocol module through an SDN controller module, and forwarding the OF protocol encapsulation to the corresponding interface for processing; a standard southbound interface is provided for the lower part;
the kernel module is used for: the shielding bottom layer provides a standard IP layer and an interface for the operation of an upper layer protocol; and completing communication adaptation between the IP kernel message and the SDN controller;
the protocol module: the SDN router is used for processing a traditional standard router protocol to form a corresponding routing table and a forwarding table, informing the SDN controller through a routing engine module, generating a flow table item by the SDN controller according to the routing table and the forwarding table, and issuing and processing the flow table item.
Preferably, the kernel module is configured with a NetLink adaptation module, and is configured to complete mapping of the virtual IP interface.
Further, the NetLink adaptation module is further configured to complete interactive adaptation of data from the SDN controller to the IP kernel interface, provide a uniform standardized IP interface for the protocol module through the IP kernel layer, and send protocol data received from the SDN controller to the IP kernel layer through the NetLink adaptation interface.
Furthermore, the protocol module adopts a Quagga protocol management module, and can receive a protocol message from the IP kernel layer through a standard Socket interface.
Still further, the conventional standard router protocol includes a unicast routing protocol, a multicast routing protocol, and an MPLS protocol, and the protocol module corresponds the unicast routing protocol, the multicast routing protocol, and the MPLS protocol to form a unicast routing table, a multicast forwarding table, and an MPLS label forwarding table, respectively.
Still further, the SDN controller is deployed on a control unit, the control unit including a computer, an industrial control board, a server, a cloud platform; the SDN controller is loaded and operated in a software mode.
Based on the virtual router, the invention also provides a method for realizing interconnection between the SDN network and the traditional IP network, which comprises a preparation process and an interaction process, and the method comprises the following specific steps:
the preparation process comprises the following steps:
s101: connecting an edge SDN switch in the SDN network with a traditional switch in a traditional IP network, starting the traditional switch of the traditional IP network, and starting an OSPF protocol on an interconnection interface;
s102: virtualizing an SDN network into a virtual router as claimed in any one of claims 1 to 6;
s103: establishing a virtual interface mapping relation in a NetLink adaptation module of a virtual router, and mapping an interface presented by the SDN network to an interface presented by the virtual router;
s104: starting an OSPF protocol on a virtual router, and sending the OSPF protocol to the outside through a virtual interface;
and (3) an interaction process:
s201: in step S103, a virtual interface mapping relationship is established, a core module of the virtual router downloads a flow table to the edge SDN switch through a southbound interface of the SDN controller, the SDN controller sets the flow table of the edge SDN switch, and all protocol messages of the conventional switch are sent to the SDN controller for processing;
s202: the edge SDN switch receives an OSPF routing message sent by a traditional switch and sends the OSPF routing message to the SDN controller for processing through a southbound interface;
s203: the SDN controller corresponds to a virtual interface through a virtual interface mapping relation according to a sending address and an interface number contained in the message, and the message is sent to an IP kernel in a kernel module through a NetLink adaptation module;
s204: the protocol module receives a protocol message transmitted by the IP kernel through the routing engine module and transmits the protocol message to the OSPF protocol module for processing;
s205: the OSPF protocol sends a routing message to a virtual interface, acquires the routing message from a NetLink adaptation module, finds an interface presented outside a corresponding switch according to an interface number and a virtual interface mapping relation, and delivers the message to an SDN controller
S206: and the SDN controller sends the OSPF message to an interface of a corresponding edge SDN switch through a northbound interface and sends the OSPF message out.
Further, based on the receiving and sending processing of the OSPF routing message in the protocol module, the OSPF protocol is formed into a routing table; the protocol processing module sends the routing table to the SDN controller for processing, and the SDN controller firstly converts the routing table into a flow table item after receiving the routing table; and the SDN controller issues the flow table items to the corresponding edge SDN switch for execution.
Still further, the southbound interface comprises a flow table issued to each edge SDN switch for execution, OpenFlow protocol encapsulation and analysis, and standard TCP/IP protocol message processing.
Still further, the interface presented by the SDN network to the outside is an interface outside each edge SDN switch pair, and the interface outside each edge SDN switch pair is mapped to a router interface on the virtual router.
The SDN network is wholly virtualized into a virtual router, and the whole virtual router is externally presented as a standard router function. The SDN network internal network can be considered as virtual router internal information interaction, and normal flow table matching exchange in the network can be realized through pure SDN flow table control; the SDN network external interconnection interface can be mapped into a virtual router external interface, various traditional router protocols are operated in the virtual router, and protocol interaction is carried out externally through the external connection interfaces.
The SDN network consists of SDN controllers and edge SDN switches, each SDN controller can control a plurality of SDN switches, and the SDN controllers complete internal standard networking of the SDN network.
The SDN controller of the invention completes the functions of controlling the SDN network, and sensing and controlling the interface and the protocol of the edge SDN switch. A virtual channel is established between an interface presented by the SDN network and the SDN controller, so that all network layer protocol messages sent by a network layer protocol on the virtual router through the adaptive virtual interface can be sent to a corresponding SDN switch interface through an OF protocol OF the virtual channel, and the corresponding IP kernel interface sends the messages to a protocol module for processing. The protocol operated by the protocol module can also send data to an interface of the edge SDN switch through a virtual channel, so that protocol interaction with an external standard router is realized.
The invention has the following beneficial effects:
1. the invention provides a concept of a virtual router, which is characterized in that an SDN network is wholly virtualized into a virtual standard router, an interface presented outwards by an SDN network edge SDN switch is mapped into an interface of the virtual router, through constructing a virtual channel, the SDN controller and the edge SDN switch are logically directly connected, and protocol messages can interact outwards through the virtual channel.
2. The method can realize seamless intercommunication between the SDN network and the non-SDN network, and comprises edge-to-edge direct interconnection between the SDN network and the non-SDN network, interconnection between a plurality of SDN networks, and mixed interconnection between a plurality of traditional non-SDN switching routing devices and a plurality of SDN networks.
3. The method is simple and easy to implement, the adaptation layer is constructed through the NetLink, the bottom layer network implementation mechanism is shielded, a standard IP kernel layer platform is provided, and two-layer and three-layer protocol interaction with an external traditional network can be carried out by directly deploying the standard-based Quagga protocol processing module.
Drawings
Fig. 1 is a schematic structural diagram of the virtual router according to this embodiment.
Fig. 2 is a schematic structural diagram of the system according to the embodiment.
Fig. 3 is a flowchart of receiving a protocol packet by an edge SDN switch according to this embodiment.
Fig. 4 is a flowchart of the protocol module receiving a message from the IP core according to this embodiment.
Fig. 5 is a flowchart of protocol module table entry issuing in this embodiment.
Fig. 6 is a schematic diagram of virtualizing an SDN network into a virtual router according to the present embodiment.
Fig. 7 is a schematic diagram of a virtual channel according to the present embodiment.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1, a virtual router includes an SDN controller, a kernel module, and a protocol module;
the SDN controller: providing a standard northbound interface for the upper part, carrying out OF protocol encapsulation on a flow table configuration instruction OF an application and message data OF a protocol module through an SDN controller module, and forwarding the OF protocol encapsulation to the corresponding interface for processing; a standard southbound interface is provided for the lower part;
the kernel module is used for: the shielding bottom layer provides a standard IP layer and an interface for the operation of an upper layer protocol; and completing communication adaptation between the IP kernel message and the SDN controller;
the protocol module: the protocol module adopts a Quagga protocol management module, provides a traditional standard router protocol processing software function, can complete traditional standard unicast routing protocols (OSPF, RIP, EIGRP, BGP), multicast routing protocols and MPLS protocols, respectively forms a unicast routing table, a multicast forwarding table and an MPLS label forwarding table, informs an SDN controller through a routing engine module, and generates a flow table item according to the routing table, the forwarding table and other information and sends the flow table item down for processing.
The kernel module described in this embodiment is configured with a NetLink adaptation module, and is configured to complete mapping of a virtual IP interface. The NetLink adaptation module is also used for finishing data interactive adaptation from the SDN controller to the IP kernel interface, providing a uniform standardized IP interface for the protocol module through the IP kernel layer, and sending the protocol data received from the SDN controller to the IP kernel layer through the NETLink adaptation interface.
In this embodiment, the protocol module adopts a Quagga protocol management module, provides a protocol processing function under a standardized network interface, and can receive a protocol packet from a kernel layer through a standard Socket interface, and all general network protocols can well run on an IP kernel layer.
The SDN controller of this embodiment is deployed on a control unit, where the control unit includes a computer, an industrial control board, a server, and a cloud platform; the SDN controller is loaded and operated in a software mode.
Based on the virtual router described above, this embodiment further provides a method for implementing interconnection between an SDN network and a conventional IP network, and this embodiment is explained in detail with an example system shown in fig. 2, where the example system includes four switches, where the switch A, B is a conventional three-tier switch, the switch C, D is an SDN switch, and the SDN controller and the switch C, D together form an SDN network. Interface 1 of SDN switch C is connected to legacy switch a, and interface 4 of SDN switch D is connected to legacy switch B. A 'and B' are terminal computers respectively.
The method for realizing interconnection between the SDN network and the traditional IP network comprises a preparation process and an interaction process, and specifically comprises the following steps:
the preparation process comprises the following steps:
s101: connecting an edge SDN switch in the SDN network with a traditional switch in a traditional IP network, starting the traditional switch of the traditional IP network, and starting an OSPF protocol on an interconnection interface. As shown in fig. 2.
S102: the SDN network is virtualized as a virtual router as described above, as shown in fig. 2.
S103: a virtual interface mapping relationship is established in a NetLink adaptation module of a virtual router, and an interface presented externally by an SDN network is mapped into an interface presented externally by the virtual router, as shown in fig. 2, in the virtual router of this embodiment, two virtual interfaces are provided externally, which are M and N respectively, where an address of the M interface is 100.0.0.2, and an address of the N interface is 200.0.0.2; i.e. the mapping of M to N and to interfaces 1, 4 of interfaces 1, D of the entity edge SDN switch C.
S104: starting an OSPF protocol on a virtual router, and sending the OSPF protocol to the outside through a virtual interface;
and (3) an interaction process:
s201: in step S103, a virtual interface mapping relationship is established, a core module of the virtual router downloads a flow table to the SDN switch through a southbound interface of the SDN controller, the SDN controller completes flow table setting of the edge SDN switch, and all protocol messages of the conventional switch are sent to the SDN controller for processing;
specifically, a kernel module of the virtual router issues flow tables to the SDN switches C and D through southbound interfaces of the SDN controller, and the SDN switch is required to receive all messages with broadcast addresses, multicast addresses, and target addresses of 100.0.0.2 and 200.0.0.2, and send the messages to the SDN controller for processing through Packet-In messages In a southbound interface protocol of the SDN controller.
S202: the edge SDN switches C and D receive OSPF routing packets sent by the conventional three-layer switches a and B, and send the OSPF routing packets to the SDN controller for processing through Packet-In Packet encapsulation, as shown In fig. 3, the edge SDN switch receives a flow of protocol packets.
S203: after receiving the Packet-In message of the SDN switch, the SDN controller corresponds to a virtual interface through a virtual interface mapping relation according to a sending address and an interface number contained In the message, and sends the message to an IP kernel through a NetLink adaptation module.
S204: as shown in fig. 4, the protocol processing module performs process waiting on the kernel, receives the protocol packets transmitted by the IP kernel, that is, the protocol packets sent by the switches a and B, through the routing engine module, and sends the protocol packets to the OSPF protocol module in the protocol module for routing processing.
S205: as shown in fig. 5, in the OSPF protocol managed by the Quagga protocol, a routing packet is sent to a virtual interface, the routing packet is obtained in the NetLink adaptation module, an interface presented to the outside of the corresponding switch is found according to the interface number and the mapping relationship of the virtual interface, and the packet is delivered to the SDN controller;
s206: and the SDN controller sends the OSPF message to a corresponding interface of a corresponding edge SDN switch through a northbound interface controlled by the SDN based on the Packet-Out message and sends the OSPF message Out.
In this embodiment, based on the sending and receiving processing of the OSPF routing packet in the protocol module, the OSPF protocol is formed into a routing table; the protocol processing module sends the routing table to the SDN controller for processing, and the SDN controller firstly converts the routing table into a flow table item after receiving the routing table; and the SDN controller issues the flow tables of the node C and the node D to the corresponding SDN switch for execution.
Wherein, the routing table is as follows:
b next hop of target address, B outgoing interface, N hop count: 1
Target address, next hop A, outgoing interface, M hop count: 1
The SDN controller converts the routing table into a flow table entry as follows:
a node C flow table:
target address B next hop D output interface 2
Target address A next hop A outgoing interface 1
A node D flow table:
target address B next hop B outgoing interface 4
Target address A next hop C out interface 3
In the interconnection process between an actual traditional network and an SDN network, after a service packet of the traditional network enters the SDN network, an SDN switch forwards data to a corresponding next hop node according to a flow table;
the method comprises the following specific steps:
d1: ping terminal B 'on terminal a';
d2: the traditional switch A sends the service to the next hop 100.0.0.2, namely the node C, according to the routing table;
d3: the edge SDN switch C performs matching forwarding according to the flow table of the SDN controller to forward data
To edge SDN switch D;
d4: the edge SDN switch D performs matching forwarding according to the flow table of the SDN controller, and forwards data
To 200.0.0.1, node B;
d5: the traditional switch B executes the traditional switch function to forward the data to the terminal B';
the reverse process of the Ping terminal a 'on the terminal B' is similar in this embodiment, thereby realizing bidirectional Ping communication.
The southbound interface described in this embodiment includes that a flow table is issued to each SDN switch to execute, an OpenFlow protocol is encapsulated and analyzed, and a standard TCP/IP protocol packet is processed.
In this embodiment, the interface presented by the SDN network to the outside is an interface outside each edge SDN switch, and the interface outside each edge SDN switch is mapped to a router interface on the virtual router.
As shown in fig. 6, in the present embodiment, the SDN network is virtualized into a virtual router, and the virtual router is externally presented as a standard router function. The SDN network internal network can be considered as virtual router internal information interaction, and normal flow table matching exchange in the network can be realized through pure SDN flow table control; the SDN network external interconnection interface can be mapped into a virtual router external interface, various traditional router protocols are operated in the virtual router, and protocol interaction is carried out externally through the external connection interfaces.
The SDN network described in this embodiment includes SDN controllers and SDN switches, each SDN controller can control multiple SDN switches, and the SDN controller completes standard networking inside the SDN network.
The SDN controller in this embodiment performs SDN network control, and interface and protocol aware control functions for the edge SDN switch. As shown in fig. 7, a virtual channel is established between an interface presented externally by the SDN network and the SDN controller, so that all network layer protocol messages sent by a network layer protocol on the virtual router through the adapted virtual interface can be sent to a corresponding SDN switch interface through an OF protocol OF the virtual channel, and the corresponding IP core interface sends the messages to the protocol module for processing. The protocol operated by the protocol module can also send data to an interface of the edge SDN switch through a virtual channel, so that protocol interaction with an external standard router is realized.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (1)
1. A method for realizing interconnection between SDN network and traditional IP network is characterized in that: the method comprises a preparation process and an interaction process, and comprises the following specific steps:
the preparation process comprises the following steps:
s101: connecting an edge SDN switch in the SDN network with a traditional switch in a traditional IP network, starting the traditional switch of the traditional IP network, and starting an OSPF protocol on an interconnection interface;
s102: virtualizing the SDN network into a virtual router;
s103: establishing a virtual interface mapping relation in a NetLink adaptation module of a virtual router, and mapping an interface presented by the SDN network to an interface presented by the virtual router;
s104: starting an OSPF protocol on a virtual router, and sending the OSPF protocol to the outside through a virtual interface;
and (3) an interaction process:
s201: in step S103, a virtual interface mapping relationship is established, a core module of the virtual router downloads a flow table to the edge SDN switch through a southbound interface of the SDN controller, the SDN controller sets the flow table of the edge SDN switch, and all protocol messages of the conventional switch are sent to the SDN controller for processing;
s202: the edge SDN switch receives an OSPF routing message sent by a traditional switch and sends the OSPF routing message to the SDN controller for processing through a southbound interface;
s203: the SDN controller corresponds to a virtual interface through a virtual interface mapping relation according to a sending address and an interface number contained in the message, and the message is sent to an IP kernel in a kernel module through a NetLink adaptation module;
s204: the protocol module receives a protocol message transmitted by the IP kernel through the routing engine module and transmits the protocol message to the OSPF protocol module for processing;
s205: the OSPF protocol sends a routing message to a virtual interface, acquires the routing message from a NetLink adaptation module, finds an interface presented outside a corresponding switch according to an interface number and a virtual interface mapping relation, and delivers the message to an SDN controller
S206: the SDN controller sends the OSPF message to an interface of a corresponding edge SDN switch through a northbound interface and sends the OSPF message out;
forming a routing table by the OSPF protocol based on the receiving and sending processing of the OSPF routing message in the protocol module; the protocol processing module sends the routing table to the SDN controller for processing, and the SDN controller firstly converts the routing table into a flow table item after receiving the routing table; the SDN controller issues the flow table items to the corresponding SDN switch for execution;
the virtual router comprises an SDN controller, a kernel module and a protocol module;
the SDN controller: providing a standard northbound interface for the upper part, carrying out OF protocol encapsulation on a flow table configuration instruction OF an application and message data OF a protocol module through an SDN controller module, and forwarding the OF protocol encapsulation to the corresponding interface for processing; a standard southbound interface is provided for the lower part;
the kernel module is used for: the shielding bottom layer provides a standard IP layer and an interface for the operation of an upper layer protocol; and completing communication adaptation between the IP kernel message and the SDN controller;
the protocol module: the SDN router is used for processing the traditional standard router protocol to form a corresponding routing table and a forwarding table, informing the SDN controller through a routing engine module, generating a flow table item by the SDN controller according to the routing table and the forwarding table, and issuing and processing the flow table item;
the kernel module is provided with a NetLink adaptation module for completing the mapping of the virtual IP interface;
the NetLink adaptation module is also used for finishing data interactive adaptation from the SDN controller to the IP kernel interface, providing a uniform standardized IP interface for the protocol module through the IP kernel layer, and sending the protocol data received from the SDN controller to the IP kernel layer through the NETLink adaptation interface;
the protocol module adopts a Quagga protocol management module and can receive a protocol message from an IP kernel layer through a standard Socket interface;
the traditional standard router protocol comprises a unicast routing protocol, a multicast routing protocol and an MPLS protocol, and the protocol module respectively and correspondingly forms a unicast routing table, a multicast forwarding table and an MPLS label forwarding table by the unicast routing protocol, the multicast routing protocol and the MPLS protocol;
the SDN controller is deployed on a control unit, and the control unit comprises a computer, an industrial control board, a server and a cloud platform; the SDN controller is loaded and operated in a software mode;
the southward interface comprises a flow table which is issued to each SDN switch to execute, package and analyze an OpenFlow protocol and process a standard TCP/IP protocol message;
an interface presented by the SDN network to the outside is an interface outside each edge SDN switch pair, and the interface outside each edge SDN switch pair is mapped into a router interface on the virtual router;
virtualizing the SDN network into a virtual router integrally, wherein the virtual router integrally has a standard router function; the SDN network internal network considers the internal information interaction of the virtual router, and normal flow table matching exchange in the network is realized through pure SDN flow table control; the SDN network external interconnection interface can be mapped into a virtual router external interface, various traditional router protocols are operated in the virtual router, and protocol interaction is carried out externally through each external connection interface, in this way, the SDN network can be deployed in the whole network in a common two-layer or three-layer router mode, and flat networking is realized;
the SDN network consists of SDN controllers and SDN switches, each SDN controller can control a plurality of SDN switches, and the SDN controllers complete SDN network internal standard networking;
the SDN controller completes the control OF the SDN network and the sensing control function OF an edge SDN switch interface and a protocol, and a virtual channel is established between an interface presented by the SDN network and the SDN controller, so that all network layer protocol messages sent by a network layer protocol on a virtual router through an adaptive virtual interface can be sent to a corresponding SDN switch interface through an OF protocol OF the virtual channel, and the corresponding IP kernel interface sends the messages to a protocol module for processing; and the protocol operated by the protocol module also sends data to an interface of the edge SDN switch through a virtual channel to realize protocol interaction with an external standard router.
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