CN106656793B - Data interaction method for SDN network and IP network - Google Patents
Data interaction method for SDN network and IP network Download PDFInfo
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- H—ELECTRICITY
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- H04L45/742—Route cache; Operation thereof
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- H—ELECTRICITY
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Abstract
according to the method provided by the invention, the local host is additionally arranged in the SDN, the local host and the edge router of the IP network realize the sharing of topology information of the SDN and the IP network, the SDN controller can determine the data forwarding path according to the shared routing information, and after the data forwarding path is established, the SDN controller is not required to participate in message analysis and new path calculation, so that the processing load of the SDN controller is reduced. Compared with the prior art, the expandability and flexibility of the system are enhanced.
Description
Technical Field
the invention relates to the technical field of computer network application, in particular to a data interaction method of an SDN (software defined network) network and an IP (internet protocol) network.
Background
Software defined Networking (Software definition Networking) was originally a novel network architecture proposed by the university of stanford clearage research group in the united states, and the core idea thereof is to separate a control plane from a forwarding plane, adopt a centralized control mode, and make a network more open, flexible and expandable through a Software programming and standardized development interface, so that fine management and optimization of the network can be better realized on the basis of knowing the information of the whole network, and development and progress of network technology can be facilitated.
although the SDN network has many advantages, because the architecture of the SDN network is subversive to the network architecture at the present stage, the processing mode and hardware devices of the data packet are greatly different from those of the current routing switching device, the SDN network and the IP network cannot directly realize interconnection communication at present, and the transition from the traditional IP network to the SDN network is an extremely complex and long road, so that it is of great importance to research a communication mechanism under the coexistence of the IP network and the SDN network.
an existing communication method for interconnecting an SDN network and an IP network by using a BGP protocol is to regard the entire SDN network as a virtual standard router. In the scheme, the SDN controller is simulated to be a router which sends SDN network information to the BGP edge router, and then the SDN controller acquires the routing information of the IP network from the BGP edge router. However, in the specific implementation of this method, the SDN controller needs to have multiple physical network ports connected to the BGP edge router, and needs to participate in processing huge EBGP routing information, which brings a certain burden to the controller. This approach is less flexible and expandable.
disclosure of Invention
the invention provides a data interaction method of an SDN network and an IP network for solving the problems of the prior art, the method is characterized in that a local host is additionally arranged in the SDN network, the local host and an edge router of the IP network realize the sharing of topology 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 is not required to participate in message analysis and calculate a new path, so that the processing load of the SDN controller is reduced.
in order to realize the purpose, the technical scheme is as follows:
A data interaction method of an SDN network and an IP network, wherein the SDN network comprises an SDN controller, a local host, a host j and an edge switch; the IP network comprises an edge router and a host k, and the host k is physically connected with the edge router; the SDN controller is physically connected with a local host, the SDN controller is logically connected with an edge switch, the edge switch is physically connected with an edge router and a host j, the local host is logically connected with the edge switch, and the local host is logically connected with the edge router; the data interaction method specifically comprises the following steps:
(1) Local host and edge router realize SDN network and IP network topology information sharing
S11, the SDN controller acquires routing information of the SDN from the local host to know the topological structure of the SDN;
s12, the edge router sends a protocol data Packet to the local host through the edge switch, and the edge switch receives the protocol data Packet and forwards the protocol data Packet to the SDN controller In a Packet _ In message mode;
S13, judging whether the destination of the protocol data packet is a local host by the SDN controller, if so, calculating and selecting a path for the protocol data packet to be transmitted from the edge switch to the local host, and then sending a flow table item to the edge switch along the selected path by the SDN controller so as to establish a data path;
S14, transmitting a protocol data packet sent by the edge router to a local host through a data path, processing the received protocol data packet by the local host to obtain routing information of the IP network, transmitting the obtained routing information of the IP network to an SDN controller, and storing the routing information by the SDN controller;
S15, the local host sends a protocol data Packet to the edge router through the edge switch, and the edge switch receives the protocol data Packet and forwards the protocol data Packet to the SDN controller In a Packet _ In message mode;
s16, judging whether the destination of the protocol data packet is an edge router or not by the SDN controller, if so, calculating and selecting a path of the protocol data packet transmitted to the edge router by the local host, and then sending a flow table item to an edge switch along the selected path by the SDN controller so as to establish a data path;
s17, transmitting a protocol data packet sent by the local host to an edge router through a data path, processing the received protocol data packet by the edge router to obtain routing information of the SDN network, and then storing the routing information;
(2) Data interaction of SDN network and IP network
1) host k of IP network sends data to host j of SDN network
S21, a host k of the IP network sends an ARP request data message, the target IP is a host j, the ARP request data message reaches an edge switch after passing through the transmission action of the edge router, and the edge switch forwards the ARP request data message to an SDN controller In a Packet _ In message mode;
S22, judging whether a target IP of the ARP request data message is a host of the SDN network by the SDN controller, if so, selecting a path from the edge switch to the host j, and then issuing a bidirectional flow table item to the edge switch along the selected path by the SDN controller so as to establish a data path from the edge switch to the host j;
S23, encapsulating the ARP reply data Packet by the SDN controller, sending the ARP reply data Packet to an edge switch in a Packet _ Out message form, forwarding the Packet _ Out message to the edge router by the edge switch, and transmitting the Packet _ Out message to a host k by the edge router;
S24, after receiving the ARP reply data packet, the host k starts to send data to the host j;
2) Host j of SDN network sends data to host k of IP network
s25, a host j of the SDN network sends an ARP request data message, the target IP is a host k, the ARP request data message is transmitted to an edge switch, and the edge switch forwards the ARP request data message to the SDN controller In a Packet _ In message mode;
s26, judging whether a source IP of the ARP request data message is a host of the SDN network by the SDN controller, if so, selecting a path from the edge switch to the edge router, and issuing a bidirectional flow table item to the edge switch along the selected path by the SDN controller so as to establish a data path from the edge switch to the edge router;
S27, encapsulating the ARP reply data Packet by the SDN controller, issuing the ARP reply data Packet to an edge switch in a Packet _ Out message form, and forwarding the Packet _ Out message to a host j by the edge switch;
and S28, after the host j receives the ARP reply data packet, starting to send data to the host k.
preferably, the SDN controller sends the state request information to an edge switch in the SDN network at regular time, then calculates real-time traffic data of each port of the edge switch according to a reply of the edge switch, and provides a basis for selecting a path according to the calculated data.
preferably, when the path in (1) and (2) is selected, the shortest path between two devices is selected.
preferably, after the data path is established in (1) and (2), the SDN network sends a port state request message to an edge switch in the SDN network at regular time, and senses a link traffic condition according to a reply of the edge switch, and then reestablishes the optimized path.
compared with the prior art, the invention has the beneficial effects that:
According to the method provided by the invention, the local host is additionally arranged in the SDN, the local host and the edge router of the IP network realize the sharing of topology information of the SDN and the IP network, the SDN controller can determine the data forwarding path according to the shared routing information, and after the data forwarding path is established, the SDN controller is not required to participate in message analysis and new path calculation, so that the processing load of the SDN controller is reduced. Compared with the prior art, the expandability and flexibility of the system are enhanced.
Drawings
Fig. 1 is a first architecture diagram of an SDN network and an IP network.
fig. 2 is a flow chart of a method.
fig. 3 is a second architecture diagram of the SDN network and the IP network.
Detailed Description
the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
the invention is further illustrated below with reference to the figures and examples.
Example 1
the framework of the SDN network and the IP network is specifically shown in fig. 1, where port 1 of the edge router R1 is directly connected to the edge switch S1, the port IP address is 100.0.0.1, the MAC address is 00:00:00:00:00:01, port 1 of the edge router R2 is directly connected to the edge switch S2, the port IP address is 100.0.0.2, and the MAC address is 00:00:00: 02; an SDN network formed by an edge switch, a controller and a local host, wherein an interface Eth0 connected with the edge switch S3 on the local host is provided with two virtual network ports (IP:10.0.1.1, 10.0.1.2) and MAC addresses of 00:00:00:03, the IP network is physically and directly connected with the edge switches S1 and S2 of the SDN network through the edge routers R1 and R2, a port 1 of the edge switch S1 is connected with the edge router R1, and a port 1 of the edge switch S2 is connected with the edge router R2; in the SDN network, the IP address of a controller is 10.0.2.2, a port 2 of a local host is directly connected with the controller physically, and the interface address is 10.0.2.1; the port 1 of the local host is physically and directly connected with the port 3 of the edge switch S3 and is logically connected with an edge router R1 and an edge router R2;
In the topology shown in fig. 1, the specific process of sharing the topology information of the SDN network and the IP network is as follows:
(1) the controller acquires the routing information of the SDN network from the local host to know the topology structure of the whole network;
(2) The protocol data Packet sent out by the edge router R1 of the IP network to the edge switch S1 is forwarded to the controller In the form of a Packet _ In message because of no relevant matched flow table entry;
(3) The Ryu controller then analyzes the Packet _ In message, and the result is as follows:
(4) The controller judges that the destination of the packet is a local host in the SDN network according to analysis, and analyzes and calculates the path of the destination host to which the data packet arrives according to the grasped global view to obtain the following paths: S1-S3-local host.
(5) The controller sends down flow table items to the edge switches along the way, and establishes a data path:
flow entry rules issued on the edge switch S1:
Matching rules: eth _ type IPV4, eth _ dst 00:00:00:00:00:03, and IPV4_ dst 10.0.1.1
The treatment method comprises the following steps: forwarding data packets from port 2
flow entry rules issued on the edge switch S2:
Matching rules: eth _ type IPV4, eth _ dst 00:00:00:00:00:03, and IPV4_ dst 10.0.1.1
the treatment method comprises the following steps: forwarding data packets from port 3
then, the source IP and MAC addresses in the matching rules are changed into the addresses of the local hosts, the destination IP and MAC addresses are changed into the addresses of the edge router R1, the output port is changed into a data inflow port, then two flow tables are issued, a bidirectional communication path is established, after the steps, protocol data packets sent to the local hosts from the edge router R1 can reach the local hosts along the path, and similarly, the data packets sent by the local hosts can reach the edge router R1 according to a reverse path, so that the intercommunication of network topology information between the edge router R1 and the local hosts in the SDN network is completed.
The following describes establishment of a data path with reference to the packet forwarding flowchart of fig. 2 and the network topology diagram of fig. 3. Here, the network topology configuration is similar to that of fig. 1, the IP address of host H1 is 192.168.1.1, the network where the host is located is 192.168.1.0/24, the IP address of host H2 is 192.168.2.1, the network where the host is located is 192.168.2.0/24, and the IP address of the edge router connected to the SDN network is 10.0.0.2. The IP address of a host H3 in the SDN network is 192.168.3.1, and the MAC address is 00:00:00:00:00: 04. The data path establishment steps from host H1 in the IP network to host H3 in the SDN network are as follows:
(1) h1 sends out an ARP request data message, the destination IP is H3, and the ARP request data message is forwarded to the controller through the edge router R1 In the form of Packet _ In message through the edge switch;
(2) The controller analyzes the target IP, judges that the message is an ARP data request message sent to the local host, and obtains the MAC address of H3, the connected edge switch S4 and the output port ETH3 through a host position information table obtained in DHCP service, wherein the contents of the information table are as follows:
| IP | MAC | DPID | PORT_NO |
| 192.168.3.1 | 00：00：00：00：00：04 | 4 | 3 |
(3) the controller encapsulates the ARP reply data Packet, issues the ARP reply data Packet to S1 in a Packet _ Out mode, and informs S1 to forward the data stream from the port 1;
(4) The controller calculates shortest paths S1-S2-S4 from the source edge switch S1 and the destination edge switch S4,
a pair of bidirectional flow table entries is issued along the path:
matching rule 1: 192.168.3.1, performs the actions: modifying the destination MAC of the datagram header to be the MAC address 00:00:00:00:00:04 of H3;
Matching rule 2: destination IP:192.168.1.0, perform the action: modifying the destination MAC of the datagram header to be the MAC address 00:00:00:00:00:01 of R1;
(5) after H1 receives the ARP reply message, it considers that the data path is established and starts to transmit data message to H3.
the bidirectional path is established, when a host H3 in the SDN network communicates with the H1, a controller does not need to participate in message analysis and new path calculation, the processing load of the controller is reduced, and the system is more flexible and convenient.
it should be added that the controller will send a status request message to each edge switch at regular time, and reestablish the optimized data path according to the link traffic status sensed by the edge switch. In this example, if H2 sends data to H3 at the same time, and a data path S2-S4 is established, the controller senses that the bandwidth occupancy rate in the H1-H3 path is high, and if a spare path S1-S3-S4 is idle, the original path is automatically switched to the spare path, so as to improve the link utilization rate.
When a host H3 in the SDN network communicates with a host H1 in the IP network, a next hop address for reaching a destination network needs to be acquired, wherein the network where H1 is located is 192.168.1.0/24, and the IP address of a boundary router connected with the SDN network is 100.0.0.1, that is, the next hop address 100.0.0.1 of the 192.168.1.0/24 network.
after the edge router R1 establishes a connection with a local host in the SDN network, the edge router R1 declares routing information in its own domain, and the local host updates its own routing table:
| Network | Next Hop |
| 192.168.1.0/24 | 100.0.1.0 |
The controller acquires the routing information from the local host and adds a routing entry as follows:
R1(192.168.1.0/24, next hop: local) - - > 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 routing entry, the controller calculates the shortest transmission path S4-S2-S1, and issues a pair of bidirectional flow tables:
matching rule 1: destination IP 192.168.1.0, perform the action: modifying the destination MAC of the datagram header to be the MAC address 00:00:00:00:00:01 of R1;
Matching rule 2: destination IP:192.168.3.1, performing the action: the destination MAC of the modified datagram header is MAC address 00:00:00:00:00:04 of H3.
after the bidirectional flow table is established, similar to the above, when the IP network host accesses the SDN network host, the controller is not required to parse the message computation path again, thereby reducing the burden of the controller.
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. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. 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 (4)
1. A data interaction method of an SDN network and an IP network is characterized in that: the SDN network comprises an SDN controller, a local host, a host j and an edge switch; the IP network comprises an edge router and a host k, and the host k is physically connected with the edge router; the SDN controller is physically connected with a local host, the SDN controller is logically connected with an edge switch, the edge switch is physically connected with an edge router and a host j, the local host is logically connected with the edge switch, and the local host is logically connected with the edge router; the data interaction method specifically comprises the following steps:
(1) local host and edge router realize SDN network and IP network topology information sharing
s11, the SDN controller acquires routing information of the SDN from the local host to know the topological structure of the SDN;
s12, the edge router sends a protocol data Packet to the local host through the edge switch, and the edge switch receives the protocol data Packet and forwards the protocol data Packet to the SDN controller In a Packet _ In message mode;
S13, judging whether the destination of the protocol data packet is a local host by the SDN controller, if so, calculating and selecting a path for the protocol data packet to be transmitted from the edge switch to the local host, and then sending a flow table item to the edge switch along the selected path by the SDN controller so as to establish a data path;
S14, transmitting a protocol data packet sent by the edge router to a local host through a data path, processing the received protocol data packet by the local host to obtain routing information of the IP network, transmitting the obtained routing information of the IP network to an SDN controller, and storing the routing information by the SDN controller;
S15, the local host sends a protocol data Packet to the edge router through the edge switch, and the edge switch receives the protocol data Packet and forwards the protocol data Packet to the SDN controller In a Packet _ In message mode;
s16, judging whether the destination of the protocol data packet is an edge router or not by the SDN controller, if so, calculating and selecting a path of the protocol data packet transmitted to the edge router by the local host, and then sending a flow table item to an edge switch along the selected path by the SDN controller so as to establish a data path;
S17, transmitting a protocol data packet sent by the local host to an edge router through a data path, processing the received protocol data packet by the edge router to obtain routing information of the SDN network, and then storing the routing information;
(2) data interaction of SDN network and IP network
1) host k of IP network sends data to host j of SDN network
S21, a host k of the IP network sends an ARP request data message, the target IP is a host j, the ARP request data message reaches an edge switch after passing through the transmission action of the edge router, and the edge switch forwards the ARP request data message to an SDN controller In a Packet _ In message mode;
S22, judging whether a target IP of the ARP request data message is a host of the SDN network by the SDN controller, if so, selecting a path from the edge switch to the host j, and then issuing a bidirectional flow table item to the edge switch along the selected path by the SDN controller so as to establish a data path from the edge switch to the host j;
S23, encapsulating the ARP reply data Packet by the SDN controller, sending the ARP reply data Packet to an edge switch in a Packet _ Out message form, forwarding the Packet _ Out message to the edge router by the edge switch, and transmitting the Packet _ Out message to a host k by the edge router;
s24, after receiving the ARP reply data packet, the host k starts to send data to the host j;
2) Host j of SDN network sends data to host k of IP network
s25, a host j of the SDN network sends an ARP request data message, the target IP is a host k, the ARP request data message is transmitted to an edge switch, and the edge switch forwards the ARP request data message to the SDN controller In a Packet _ In message mode;
S26, judging whether a source IP of the ARP request data message is a host of the SDN network by the SDN controller, if so, selecting a path from the edge switch to the edge router, and issuing a bidirectional flow table item to the edge switch along the selected path by the SDN controller so as to establish a data path from the edge switch to the edge router;
s27, encapsulating the ARP reply data Packet by the SDN controller, issuing the ARP reply data Packet to an edge switch in a Packet _ Out message form, and forwarding the Packet _ Out message to a host j by the edge switch;
And S28, after the host j receives the ARP reply data packet, starting to send data to the host k.
2. the data interaction method between the SDN network and the IP network according to claim 1, wherein: the SDN controller sends state request information to an edge switch in the SDN network at regular time, then real-time flow data of each port of the edge switch is calculated according to the reply of the edge switch, and a basis is provided for path selection according to the calculated data.
3. the data interaction method between the SDN network and the IP network according to claim 1, wherein: when the path is selected in the steps (1) and (2), the shortest path between the two devices is selected.
4. The data interaction method between the SDN network and the IP network according to claim 1, wherein: after the data paths are established in the steps (1) and (2), the SDN regularly sends port state request messages to an edge switch in the SDN, and senses the link flow condition according to the reply of the edge switch, and then reestablishes the optimized paths.
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| CN108259349B (en) * | 2017-08-31 | 2020-11-27 | 新华三技术有限公司 | Message forwarding method and device |
| CN109257372B (en) * | 2018-10-29 | 2021-07-06 | 深信服科技股份有限公司 | Message forwarding method, device, storage medium and apparatus based on network convergence |
| 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 |
| CN110365553B (en) * | 2019-07-24 | 2022-11-22 | 湘潭大学 | IPv6 network flow monitoring method and system based on SDN |
| CN112491724B (en) * | 2020-12-09 | 2022-12-09 | 福建农林大学 | IPv4 and IPv6 management system and method based on SDN |
| CN114422373A (en) * | 2022-02-16 | 2022-04-29 | 浪潮通信信息系统有限公司 | Multi-domain controller topology structure creation and path calculation method and device |
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| CN105007224A (en) * | 2015-07-28 | 2015-10-28 | 清华大学 | System and method for intercommunication between SDN (Software Defined Networking) network and IP (Internet Protocol) network |
| CN105553849A (en) * | 2015-11-26 | 2016-05-04 | 北京邮电大学 | Conventional IP network and SPTN network intercommunication method and system |
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