CN106656793A - Data interaction method of SDN network and IP network - Google Patents
Data interaction method of SDN network and IP network Download PDFInfo
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- CN106656793A CN106656793A CN201611248979.XA CN201611248979A CN106656793A CN 106656793 A CN106656793 A CN 106656793A CN 201611248979 A CN201611248979 A CN 201611248979A CN 106656793 A CN106656793 A CN 106656793A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/04—Interdomain routing, e.g. hierarchical routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/742—Route cache; Operation thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
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Abstract
The invention provides a data interaction method of an SDN network and an IP network. According to the method provided by the invention, a local host is additionally arranged in the SDN network, the local host and an edge router of the IP network share topological information of the SDN network and the IP network, an SDN controller can determine a data forwarding path according to the shared routing information, and after the data forwarding path is constructed, the SDN controller does not need to participate in message analysis or new path calculation, thereby reducing the processing burden of the SDN controller. Compared with the prior art, the scalability and flexibility are enhanced.
Description
Technical field
The present invention relates to applications of computer network technical field, more particularly, to a kind of SDN and the number of IP network
According to exchange method.
Background technology
Software defined network (Software Define Networking) is earliest by Stanford Univ USA Clean
A kind of new network architecture that slate seminar proposes, its core concept is to separate control plane with Forwarding plane,
Using central controlled mode, being made network more open, flexible and possessed by software programming and standardized development interface can
Expansion such that it is able to the precision management and optimization to network is preferably realized on the basis of whole network information is understood, is had
Beneficial to the development and progress that promote network technology.
Although SDN has many merits, due to SDN framework for the network architecture at this stage be to overturn
The change of property, its tupe and hardware device to data message has very big difference with present route exchange device, at present
SDN and IP network can not be directly realized by interconnection and communicate, from traditional IP network be transitioned into SDN would is that one it is different
Often complicated and very long road, therefore the communication mechanism under research IP network and SDN coexist has very important significance.
It is by whole SDN that a kind of existing utilization bgp protocol completes SDN and the communication means of IP network interconnection
Regard a virtual criterion router as.SDN controllers are modeled into a router in this scheme to send out to BGP edge routers
SDN information is sent, then SDN controllers obtain the routing iinformation of IP network from BGP edge routers.But this method exists
SDN controllers need multiple physical internet ports and are connected with BGP edge routers when being embodied as, and need controller to join
The EBGP routing iinformation huge with process, to controller certain burden is brought.The flexibility of this method and expansibility are poor.
The content of the invention
The present invention is the difficult problem for solving above prior art, there is provided the data interaction side of a kind of SDN and IP network
Method, the method sets up a local host in SDN, and makes local host and the edge router of IP network realize SDN
Network, IP network topology information it is shared, SDN controllers can determine that the path of data forwarding according to the routing iinformation shared,
And after data forwarding paths are built, it is not necessary to SDN controllers participate in again message parsing and calculate new route, alleviate SDN controls
Device processing load processed.
To realize above goal of the invention, the technical scheme of employing is:
A kind of data interactive method of SDN and IP network, the SDN include SDN controllers, local host,
Main frame j and edge switch;The IP network includes edge router and main frame k, main frame k and edge router physical connection;
SDN controllers and local host physical connection, SDN controllers are connected with edge switch logic, edge switch and edge road
By device, main frame j physical connections, local host is connected with edge switch logic, and local host is connected with edge router logic;
The data interactive method specifically includes following steps:
(1) local host and edge router realize SDN, IP network topology information it is shared
S11.SDN controllers obtain the routing iinformation of SDN from local host, understand the topological structure of SDN;
S12. edge router sends protocol data bag by edge switch to local host, and edge switch receives association
Protocol data bag is forwarded into SDN controllers in the form of Packet_In message after view packet;
S13.SDN controllers judge whether the destination of protocol data bag is local host, if then calculating and selecting association
View packet is transmitted to the path of local host from edge switch, then edge of the SDN controllers to the path for selecting on the way
Switch issues flow table item, so as to set up data path;
S14. the protocol data bag of the transmission of edge router is transmitted to local host, local host pair by data path
The protocol data bag of reception obtains the routing iinformation of IP network after being processed, then pass the routing iinformation of the IP network for obtaining
SDN controllers are defeated by, SDN controllers are stored;
S15. by edge switch to edge router protocol data bag, edge switch receives association to local host
Protocol data bag is forwarded into SDN controllers in the form of Packet_In message after view packet;
S16.SDN controllers judge whether the destination of protocol data bag is edge router, if then calculating and selecting
Protocol data bag is transmitted to the path of edge router by local host, then side of the SDN controllers to the path for selecting on the way
Edge switch issues flow table item, so as to set up data path;
S17. the protocol data bag of the transmission of local host is transmitted to edge router, edge router by data path
Protocol data bag to receiving obtains the routing iinformation of SDN after processing, then stored;
(2) data interaction of SDN and IP network
1) the main frame k of IP network sends data to the main frame j of SDN
The main frame k of S21.IP networks sends ARP request data message, and purpose IP is main frame j, and ARP request data message leads to
Edge switch is reached after the transmission effect for crossing edge router, edge switch is by ARP request data message with Packet_In
The form of message is forwarded to SDN controllers;
S22.SDN controllers judge that whether purpose IP of ARP request data message is the main frame of SDN, if then right
Edge switch to the path between main frame j is selected, then edge switch of the SDN controllers to the path for selecting on the way
Two-way flow table item is issued, so as to set up edge switch to the data path between main frame j;
S23.SDN controllers encapsulation ARP replys packet, and edge exchange is handed down in the form of Packet_Out message
The message is forwarded to edge router by machine, edge switch, and edge router is transferred to again main frame k;
S24. main frame k receives ARP and replys after packet, starts to send data to main frame j;
2) the main frame j of SDN sends data to the main frame k of IP network
The main frame j of S25.SDN networks sends ARP request data message, and purpose IP is main frame k, and ARP request data message is passed
Edge switch is delivered to, ARP request data message is forwarded to SDN controls by edge switch in the form of Packet_In message
Device;
S26.SDN controllers judge that whether the source IP of ARP request data message is the main frame of SDN, if then right
Edge switch to the path between edge router is selected, and edge of the SDN controllers to the path for selecting on the way is exchanged
Machine issues two-way flow table item, so as to set up edge switch to the data path between edge router;
S27.SDN controllers encapsulation ARP replys packet, and edge exchange is handed down in the form of Packet_Out message
The message is forwarded to main frame j by machine, edge switch;
S28. main frame j receives ARP and replys after packet, starts to send data to main frame k.
Preferably, the SDN controllers timing sends status request information to the edge switch in SDN, then
The real-time traffic data of each port of edge switch are calculated according to the reply of edge switch, is road according to the data for calculating
The selection in footpath provides foundation.
Preferably, when choosing to path in described (1), (2), selection is path most short between two equipment.
Preferably, set up after data path in described (1), (2), SDN timing is exchanged to the edge in SDN
Machine sending port status request message, and link flow situation is perceived according to the reply of edge switch, then start against
Path after optimization.
Compared with prior art, the invention has the beneficial effects as follows:
The method that the present invention is provided sets up a local host in SDN, and makes the side of local host and IP network
Edge router realize SDN, IP network topology information it is shared, SDN controllers can determine that according to the routing iinformation shared
The path of data forwarding, and after data forwarding paths are built, it is not necessary to SDN controllers participate in again message parsing and calculate new road
Footpath, alleviates SDN controller processing loads.Compared with prior art, its extensibility and flexibility is strengthened.
Description of the drawings
Fig. 1 is the Organization Chart one of SDN and IP network.
Fig. 2 is the flow chart of method.
Fig. 3 is the Organization Chart two of SDN and IP network.
Specific embodiment
Accompanying drawing being for illustration only property explanation, it is impossible to be interpreted as the restriction to this patent;
Below in conjunction with drawings and Examples, the present invention is further elaborated.
Embodiment 1
SDN, the framework of IP network are specifically as shown in figure 1, the direct-connected edge in port 1 of wherein edge router R1 is exchanged
Machine S1, the port IP address is 100.0.0.1, and MAC Address is 00:00:00:00:00:The port 1 of 01, edge router R2 is straight
Connect edge switch S2, the port IP address is 100.0.0.2, and MAC Address is 00:00:00:00:00:02;Exchanged by edge
The SDN that machine, controller and local host are constituted, the interface Eth0 that edge switch S3 is connected wherein on local host is arranged
Two virtual network port (IP:10.0.1.1,10.0.1.2), it is 00 to arrange MAC Address:00:00:00:00:03, IP network passes through
Edge switch S1, S2 physics of edge router R1, R2 and SDN is direct-connected, the connection edge of port 1 of edge switch S1
The connection of the port 1 edge router R2 of router R1, edge switch S2;In SDN, controller IP address is
10.0.2.2, the port 2 of local host is direct-connected with its physics, and interface IP address is 10.0.2.1;The port 1 of local host and edge
The physics of port 3 of switch S3 is direct-connected, logically contiguous with edge router R1, edge router R2;
In the topological diagram shown in Fig. 1, SDN, the shared detailed process of IP network topology information are as follows:
(1) controller opens the routing iinformation that SDN is obtained from local host, to understand full mesh topology structure;
(2) the edge router R1 of IP network is issued to the protocol data bag of edge switch S1 due to without relevant matches
Flow table item be forwarded to controller in the form of Packet_In message;
(3) Ryu controllers connect and parse this Packet_In message, obtain result as follows:
(4) controller judges that this bag destination is the local host in SDN according to analysis, and according to grasp
The path of the global view destination host that packet is reached be analyzed calculating, obtain following path:S1-S3- is local
Main frame.
(5) controller issues flow table item to edge switch on the way, sets up data path:
The flow table item rule issued on edge switch S1:
Matched rule:Eth_type=IPV4, eth_dst=00:00:00:00:00:03, ipv4_dst=10.0.1.1
Processing mode:Packet is forwarded from port 2
The flow table item rule issued on edge switch S2:
Matched rule:Eth_type=IPV4, eth_dst=00:00:00:00:00:03, ipv4_dst=10.0.1.1
Processing mode:Packet is forwarded from port 3
Then source IP, MAC Address in matched rule are changed to the address of local host, purpose IP and MAC are changed into edge
The address of router R1, by exit port data flow inbound port is changed to, then issues two flow tables, sets up two-way communication path, is passed through
Above-mentioned steps, the protocol data bag for being subsequently sent to local host from edge router R1 just can reach this landlord along this path
Machine, similar, the packet that local host sends can reach edge router R1, such edge router according to reverse path
R1 just completes the intercommunication of network topological information with local host in SDN.
With reference to the packet forwarding process figure of Fig. 2 and the network structure topological diagram of Fig. 3 data path is set up into
Row explanation.Here network topological diagram configuration is similar with Fig. 1, and the IP address of main frame H1 is 192.168.1.1, and place network is
192.168.1.0/24, the IP address of main frame H2 is 192.168.2.1, and place network is 192.168.2.0/24, with SDN
Connected edge router IP address is 10.0.0.2.In SDN the IP address of main frame H3 be 192.168.3.1, MAC Address
For 00:00:00:00:00:04.By the main frame H3 data paths establishment step in the main frame H1 to SDN in IP network such as
Under:
(1) H1 sends an ARP request data message, and purpose IP is H3, by edge router R1, Jing edge switch
Controller is forwarded in the form of Packet_In message;
(2) controller parsing purpose IP, judge the ARP request of data messages for being destined for local host, by with
The position of host machine information table obtained in DHCP service gets the MAC Address of H3, the edge switch S4 being connected and goes out end
Mouth ETH3, information table content is as follows:
IP | MAC | DPID | PORT_NO |
192.168.3.1 | 00:00:00:00:00:04 | 4 | 3 |
(3) controller encapsulation ARP replys packet, and S1 is handed down in the form of Packet_Out, and informs that S1 counts this
Forward from port 1 according to stream;
(4) controller calculates shortest path S1-S2- according to source edge switch S1 and purpose edge switch S4
S4,
A pair two-way flow table items are issued along path:
Matched rule 1:Purpose IP:192.168.3.1, execution action:Purpose MAC in modification datagram packet header is for H3's
MAC Address 00:00:00:00:00:04;
Matched rule 2:Purpose IP:192.168.1.0, execution action:Purpose MAC in modification datagram packet header is for R1's
MAC Address 00:00:00:00:00:01;
(5) H1 receives ARP and replys after message, it is believed that data path is it has been established that start to transmit data message to H3.
Establish two-way approach, can in SDN main frame H3 to H1 communicate when, it is not necessary to controller participates in again message
Parsing and calculating new route, alleviate controller processing load, make system more flexibly convenient.
You need to add is that, controller regularly can send status request message to each edge switch, be handed over according to edge
The reply changed planes perceives link flow situation and re-establishes the data path after optimization.If H2 sends number to H3 simultaneously in this example
According to, set up data path S2-S4, controller perceives higher by bandwidth usage in H1-H3 paths, and has backup path S1-
S3-S4 is more idle, original route can be switched on backup path automatically, to improve link utilization.
Main frame H3 is to the next-hop for during main frame H1 communications, needing to obtain the network that achieves the goal in IP network from SDN
Address, the network that here H1 is located is 192.168.1.0/24, and the border router IP address that it is connected with SDN is
100.0.0.1, that is to say, that go to next hop address 100.0.0.1 of 192.168.1.0/24 networks.
After edge router R1 sets up with local host in SDN and is connected, edge router R1 announces own domain
Interior routing iinformation, local host updates the routing table of oneself:
Network | NextHop |
192.168.1.0/24 | 100.0.1.0 |
One route entry of addition after this routing iinformation is obtained from local host in controller, it is as follows:
R1 (192.168.1.0/24, next-hop:Locally) --->Local host (192.168.1.0/24, next-hop:
100.0.0.1)--->Controller (192.168.1.0/24, next-hop:100.0.0.1)
After obtaining this route entry, controller calculates transmission shortest path S4-S2-S1, and issues a pair of bidirectional flows
Table:
Matched rule 1:Purpose IP:192.168.1.0, execution action:Purpose MAC in modification datagram packet header is for R1's
MAC Address 00:00:00:00:00:01;
Matched rule 2:Purpose IP:192.168.3.1, execution action:Purpose MAC in modification datagram packet header is for H3's
MAC Address 00:00:00:00:00:04.
It is similar with as described before after setting up two-way flow table, when IP network main frame accesses SDN main frame, avoid the need for
Controller parses again message and calculates path, so as to alleviate the burden of controller.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not right
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no need to be exhaustive to all of embodiment.It is all this
Any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (4)
1. the data interactive method of a kind of SDN and IP network, it is characterised in that:The SDN include SDN controllers,
Local host, main frame j and edge switch;The IP network includes edge router and main frame k, main frame k and edge router
Physical connection;SDN controllers and local host physical connection, SDN controllers are connected with edge switch logic, edge switch
With edge router, main frame j physical connections, local host is connected with edge switch logic, local host and edge router
Logic connects;The data interactive method specifically includes following steps:
(1) local host and edge router realize SDN, IP network topology information it is shared
S11.SDN controllers obtain the routing iinformation of SDN from local host, understand the topological structure of SDN;
S12. edge router sends protocol data bag by edge switch to local host, and edge switch receives agreement number
Protocol data bag is forwarded into SDN controllers in the form of Packet_In message according to after bag;
S13.SDN controllers judge whether the destination of protocol data bag is local host, if then calculating and selecting agreement number
Transmit from edge switch to the path of local host, then edge exchange of the SDN controllers to the path for selecting on the way according to bag
Machine issues flow table item, so as to set up data path;
S14. the protocol data bag of the transmission of edge router is transmitted to local host by data path, and local host is to receiving
Protocol data bag processed after obtain the routing iinformation of IP network, then the routing iinformation of the IP network for obtaining is transferred to
SDN controllers, SDN controllers are stored;
S15. by edge switch to edge router protocol data bag, edge switch receives agreement number to local host
Protocol data bag is forwarded into SDN controllers in the form of Packet_In message according to after bag;
S16.SDN controllers judge whether the destination of protocol data bag is edge router, if then calculating and selecting agreement
Packet is transmitted to the path of edge router, then edge friendship of the SDN controllers to the path for selecting on the way by local host
Change planes and issue flow table item, so as to set up data path;
S17. the protocol data bag of the transmission of local host is transmitted to edge router, edge router docking by data path
The protocol data bag of receipts obtains the routing iinformation of SDN after being processed, then stored;
(2) data interaction of SDN and IP network
1) the main frame k of IP network sends data to the main frame j of SDN
The main frame k of S21.IP networks sends ARP request data message, and purpose IP is main frame j, and ARP request data message passes through side
Edge switch is reached after the transmission effect of edge router, edge switch is by ARP request data message with Packet_In message
Form be forwarded to SDN controllers;
S22.SDN controllers judge that whether purpose IP of ARP request data message is the main frame of SDN, if then to edge
Switch to the path between main frame j is selected, and then edge switch of the SDN controllers to the path for selecting on the way is issued
Two-way flow table item, so as to set up edge switch to the data path between main frame j;
S23.SDN controllers encapsulation ARP replys packet, and is handed down to edge switch in the form of Packet_Out message,
The message is forwarded to edge router by edge switch, and edge router is transferred to again main frame k;
S24. main frame k receives ARP and replys after packet, starts to send data to main frame j;
2) the main frame j of SDN sends data to the main frame k of IP network
The main frame j of S25.SDN networks sends ARP request data message, and purpose IP is main frame k, and ARP request data message is delivered to
ARP request data message is forwarded to SDN controllers by edge switch, edge switch in the form of Packet_In message;
S26.SDN controllers judge that whether the source IP of ARP request data message is the main frame of SDN, if then to edge
Switch to the path between edge router is selected, and SDN controllers are under the path edge switch on the way for selecting
The flow table item for sending out two-way, so as to set up edge switch to the data path between edge router;
S27.SDN controllers encapsulation ARP replys packet, and is handed down to edge switch in the form of Packet_Out message,
The message is forwarded to main frame j by edge switch;
S28. main frame j receives ARP and replys after packet, starts to send data to main frame k.
2. the data interactive method of SDN according to claim 1 and IP network, it is characterised in that:The SDN controls
Device timing sends status request information to the edge switch in SDN, is then calculated according to the reply of edge switch
The real-time traffic data of each port of edge switch, foundation is provided according to the data for calculating for the selection in path.
3. the data interactive method of SDN according to claim 1 and IP network, it is characterised in that:(1), (2)
In when choosing to path, selection is path most short between two equipment.
4. the data interactive method of SDN according to claim 1 and IP network, it is characterised in that:(1), (2)
In set up after data path, SDN timing to the edge switch sending port status request message in SDN, and
Link flow situation is perceived according to the reply of edge switch, the path after optimization is then started against.
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CN110430114A (en) * | 2019-07-24 | 2019-11-08 | 中国电子科技集团公司第七研究所 | A kind of virtual router and the method for realizing SDN network and traditional IP interconnection |
CN110430114B (en) * | 2019-07-24 | 2022-02-11 | 中国电子科技集团公司第七研究所 | Virtual router and method for realizing interconnection between SDN network and traditional IP network |
CN112491724A (en) * | 2020-12-09 | 2021-03-12 | 福建农林大学 | Management system and method of IPv4 and IPv6 based on SDN |
CN114422373A (en) * | 2022-02-16 | 2022-04-29 | 浪潮通信信息***有限公司 | Multi-domain controller topology structure creation and path calculation method and device |
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