CN116319536B - Data transmission method and device based on SDWAN active/standby links, electronic equipment and storage medium - Google Patents

Abstract

The embodiment of the present invention provides a data transmission method, device, electronic device and storage medium based on SDWAN primary and backup links, including obtaining a first metric value of the SDWAN primary link when the first OSPF and the first BGP perform bidirectional redistribution of routes; obtaining a second metric value of the SDWAN backup link when the second OSPF and the second BGP perform bidirectional redistribution of routes; comparing the first metric value and the second metric value, determining a target SDWAN link from the SDWAN primary link and the SDWAN backup link; and using the target SDWAN link for data transmission. The embodiment of the present invention supports the SDWAN client to publish OSPF routes to the cloud, and redistribute them into BGP routes, implements bidirectional redistribution operations, and implements the SDWAN primary and backup link functions; so that the SDWAN primary and backup links can be used for data transmission.

Description

Data transmission method, device, electronic device and storage medium based on SDWAN primary and backup links

Technical Field

The present invention relates to the field of network data processing technology, and in particular to a data transmission method based on SDWAN primary and backup links, a data transmission device based on SDWAN primary and backup links, an electronic device and a storage medium.

Background technique

Due to the increase in SDWAN (Software Defined Wide Area Network) customer demand, more SDWAN customers require the link to have the function of primary and backup link protection, thereby ensuring high-quality network services for customers. Due to the increase in customer services, more and more customers use OSPF (Open Shortest Path First) to publish routes, and some users also require LTE (Long Term Evolution) as a backup link in the event of a WAN (Wide Area Network) network failure. The traditional SDWAN dual-machine bypass solution is generally implemented using VRRP (Virtual Router Redundancy Protocol), or a separate OSPF or a separate BGP (Border Gateway Protocol) protocol to implement the link primary and backup solution. If the customer needs to publish OSPF routes and the POP (Post Office Protocol) side only supports the BGP routing protocol, the traditional primary and backup link solution cannot meet this demand.

Summary of the invention

In view of the above problems, embodiments of the present invention are proposed to provide a data transmission method based on SDWAN primary and backup links, a data transmission device based on SDWAN primary and backup links, an electronic device and a storage medium that overcome the above problems or at least partially solve the above problems.

In a first aspect of the present invention, an embodiment of the present invention discloses a data transmission method based on a SDWAN primary and backup link, wherein the SDWAN primary link includes a first open shortest path first protocol OSPF and a first border gateway protocol BGP, and the SDWAN backup link includes a second OSPF and a second BGP, and the method includes:

When the first OSPF and the first BGP perform bidirectional republishing of routes, obtaining a first metric value of the SDWAN primary link;

When the second OSPF and the second BGP perform bidirectional republishing of routes, obtaining a second metric value of the SDWAN backup link;

Comparing the first metric value with the second metric value, determining a target SDWAN link from the SDWAN primary link and the SDWAN backup link;

The target SDWAN link is used for data transmission.

Optionally, the SDWAN main link further includes a main link kernel, and the SDWAN backup link further includes a backup link kernel; the method further includes:

Mapping the first OSPF to the primary link kernel to establish a primary link OSPF neighbor;

The second OSPF is mapped to the backup link kernel to establish a backup link OSPF neighbor.

Optionally, the method further comprises:

Based on the first BGP, establish a primary link BGP neighbor;

Based on the second BGP, a backup link BGP neighbor is established.

Optionally, the method further comprises:

Control the main link BGP neighbor to publish routes to the main link OSPF neighbor, and control the main link OSPF neighbor to publish routes to the main link BGP neighbor, so that the first OSPF and the first BGP perform bidirectional re-publishing of routes;

The backup link BGP neighbor is controlled to publish routes to the backup link OSPF neighbor, and the backup link OSPF neighbor is controlled to publish routes to the backup link BGP neighbor, so that the second OSPF and the second BGP perform bidirectional republishing of routes.

Optionally, the method further comprises:

Receive updated routing information;

The primary link OSPF neighbor and the backup link OSPF neighbor are updated according to the updated routing information.

Optionally, the method further comprises:

In the target SDWAN link, a preset routing strategy is introduced when the routes are bidirectionally redistributed.

Optionally, the routing policy includes a boundary label value, and the step of introducing a preset routing policy when bidirectionally redistributing routing in the target SDWAN link includes:

In the target SDWAN link, a route identifier is introduced when the route is bidirectionally redistributed, and the route identifier carries a route label value;

The route corresponding to the routing identifier is introduced according to the routing label value and the boundary label value.

Optionally, the step of introducing the route corresponding to the routing identifier according to the routing label value and the boundary label value includes:

Determining whether the routing label value and the boundary label value are the same;

When the routing label value is the same as the boundary label value, refusing to import the route corresponding to the routing identifier;

When the routing label value and the boundary label value are different, the route corresponding to the routing identifier is introduced.

Optionally, the first metric value includes a first uplink metric value and a first downlink metric value, and the second metric value includes a second uplink metric value and a second downlink metric value; and the step of comparing the first metric value and the second metric value to determine the target SDWAN link from the SDWAN main link and the SDWAN backup link includes:

Comparing the first uplink metric value with the second uplink metric value to determine a target uplink metric value;

Comparing the first downlink metric value with the second downlink metric value to determine a target downlink metric value;

Determine that the SDWAN uplink corresponding to the target uplink metric value is the uplink of the target SDWAN link; wherein the SDWAN uplink corresponding to the target uplink metric value is the uplink of the SDWAN primary link or the uplink of the SDWAN backup link;

Determine that the SDWAN downlink corresponding to the target downlink metric value is the downlink of the target SDWAN link; wherein, the SDWAN downlink corresponding to the target downlink metric value is the downlink of the SDWAN main link or the downlink of the SDWAN backup link.

Optionally, the step of comparing the first uplink metric value with the second uplink metric value to determine a target uplink metric value includes:

Determine a magnitude relationship between the first uplink metric value and the second uplink metric value;

When the first uplink metric value is less than the second uplink metric value, determining the first uplink metric value to be the target uplink metric value;

When the second uplink metric value is less than the first uplink metric value, the second metric value is determined to be the target uplink metric value.

Optionally, the step of comparing the first downlink metric value with the second downlink metric value to determine a target downlink metric value includes:

Determine a magnitude relationship between the first downlink metric value and the second downlink metric value;

When the first downlink metric value is less than the second downlink metric value, determining the first downlink metric value to be the target downlink metric value;

When the second downlink metric value is less than the first downlink metric value, the second metric value is determined to be the target downlink metric value.

Optionally, the step of using the target SDWAN link to transmit data includes:

Using the downlink of the target SDWAN link to perform data transmission with a preset user-side device;

The uplink of the target SDWAN link is used to transmit data with the preset cloud-side device.

In a second aspect of the present invention, an embodiment of the present invention discloses a data transmission device based on a SDWAN primary and backup link, wherein the SDWAN primary link includes a first open shortest path first protocol OSPF and a first border gateway protocol BGP, and the SDWAN backup link includes a second OSPF and a second BGP, and the device includes:

A first acquisition module, used for acquiring a first metric value of the SDWAN primary link when the first OSPF and the first BGP perform bidirectional republishing of routes;

A second acquisition module is used to obtain a second metric value of the SDWAN backup link when the second OSPF and the second BGP perform bidirectional re-publishing of routes;

A comparison module, configured to compare the first metric value and the second metric value, and determine a target SDWAN link from the SDWAN primary link and the SDWAN backup link;

A transmission module is used to use the target SDWAN link to transmit data.

In the third aspect of the present invention, an embodiment of the present invention discloses an electronic device, including a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the steps of the data transmission method based on the SDWAN primary and backup links as described above.

In a fourth aspect of the present invention, an embodiment of the present invention discloses a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the data transmission method based on the SDWAN primary and backup links as described above are implemented.

The embodiments of the present invention include the following advantages:

The embodiment of the present invention obtains the first metric value of the SDWAN primary link when the first OSPF and the first BGP perform bidirectional republishing of routes; obtains the second metric value of the SDWAN backup link when the second OSPF and the second BGP perform bidirectional republishing of routes; compares the first metric value with the second metric value, determines the target SDWAN link from the SDWAN primary link and the SDWAN backup link; and uses the target SDWAN link for data transmission. Data transmission is performed through OSPF and BGP, supporting the SDWAN client to publish OSPF routes to the cloud, and republish them into BGP routes, realizing bidirectional republishing operations, and realizing the SDWAN primary and backup link functions; so that the SDWAN primary and backup links can be used for data transmission.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flowchart of an embodiment of a data transmission method based on SDWAN primary and standby links of the present invention;

FIG2 is a flowchart of another embodiment of a data transmission method based on SDWAN primary and standby links of the present invention;

FIG3 is a schematic diagram of a software architecture based on SDWAN active/standby links of the present invention;

FIG4 is a schematic diagram of a routing connection based on SDWAN primary and backup links of the present invention;

FIG5 is a schematic diagram of a hardware connection based on SDWAN primary and backup links of the present invention;

FIG6 is a schematic diagram of a routing strategy based on SDWAN primary and backup links of the present invention;

FIG7 is a schematic diagram of data forwarding according to the present invention;

FIG8 is a schematic diagram of a LAN side link failure based on the SDWAN primary and backup links of the present invention;

FIG9 is a structural block diagram of an embodiment of a data transmission device based on SDWAN primary and backup links of the present invention.

Detailed ways

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

1 , a flow chart of the steps of an embodiment of a data transmission method based on a SDWAN primary and backup link of the present invention is shown, wherein the SDWAN primary link includes a first open shortest path first protocol OSPF and a first border gateway protocol BGP, and the SDWAN backup link includes a second OSPF and a second BGP.

In an embodiment of the present invention, the SDWAN primary and backup links include two types: an SDWAN primary link and an SDWAN backup link; wherein, when there is one SDWAN primary link, there is at least one SDWAN backup link, and when there are two or more SDWAN backup links, there is no limitation on the backup priority of the SDWAN backup link.

The SDWAN main link includes the first OSPF and the first BGP, and the SDWAN backup link includes the second OSPF and the second BGP. The first OSPF and the second OSPF are the same OSPF protocol, and the first OSPF is the OSPF protocol deployed on the SDWAN main link, and the second OSPF is the OSPF protocol deployed on the SDWAN backup link. Correspondingly, the first BGP and the second BGP are also the same BGP protocol, and the first BGP is the BGP protocol deployed on the SDWAN main link, and the second BGP is the OSPF protocol deployed on the SDWAN backup link.

The data transmission method based on the SDWAN primary and backup links may specifically include the following steps:

Step 101, when the first OSPF and the first BGP perform bidirectional route redistribution, obtain a first metric value of the SDWAN primary link;

When the first OSPF and the first BGP of the SDWAN main link are performing bidirectional route redistribution, that is, the first OSPF sends routing information to the first BGP, and the first BGP also sends routing information to the first OSPF, the routing information between the SDWAN main links carries the first metric value of the SDWAN main link, and the first metric value represents the usage priority of the SDWAN main link.

Step 102: when the second OSPF and the second BGP perform bidirectional redistribution of routes, obtain a second metric value of the SDWAN backup link;

When the second OSPF and the second BGP of the SDWAN backup link are performing bidirectional route redistribution, that is, the second OSPF sends routing information to the second BGP, and the second BGP also sends routing information to the second OSPF, the routing information between the SDWAN backup links carries the second metric value of the SDWAN backup link, and the second metric value represents the usage priority of the SDWAN backup link.

Step 103, comparing the first metric value and the second metric value, and determining a target SDWAN link from the SDWAN primary link and the SDWAN backup link;

The first metric value and the second metric value are compared to determine the size relationship between the first metric value and the second metric value, so as to screen the data transmission links in the SDWAN main link and the SDWAN backup link to determine the target SDWAN link.

Step 104: Use the target SDWAN link to transmit data.

After determining the target SDWAN link, the target SDWAN link can be used to perform data transmission operations such as sending messages.

The embodiment of the present invention obtains the first metric value of the SDWAN primary link when the first OSPF and the first BGP perform bidirectional republishing of routes; obtains the second metric value of the SDWAN backup link when the second OSPF and the second BGP perform bidirectional republishing of routes; compares the first metric value with the second metric value, determines the target SDWAN link from the SDWAN primary link and the SDWAN backup link; and uses the target SDWAN link for data transmission. Data transmission is performed through OSPF and BGP, supporting the SDWAN client to publish OSPF routes to the cloud, and republish them into BGP routes, realizing bidirectional republishing operations, and realizing the SDWAN primary and backup link functions; so that the SDWAN primary and backup links can be used for data transmission.

Referring to Figure 2, a flow chart of the steps of another embodiment of a data transmission method based on the SDWAN main and standby links of the present invention is shown. The SDWAN main link includes a main link kernel, a first open shortest path first protocol OSPF and a first border gateway protocol BGP, and the SDWAN standby link includes a standby link kernel, a second OSPF and a second BGP. Among them, the first OSPF and the second OSPF are the same OSPF protocol; the first BGP and the second BGP are the same BGP protocol; the main link kernel and the standby link kernel are also the same; that is, the SDWAN main link and the SDWAN standby link are two SDWAN links with the same architecture. Specifically, referring to Figure 3, the SDWAN main link and the SDWAN standby link have the same software architecture, including: kernel, VPP (data layer), OSPF, BGP and ZEBRA (access layer middleware). An LTE data forwarding interface PPP (Point to Point Protocol) 0 is created in the kernel, and the kernel default routing exit is PPP0, and the VPP side implements data forwarding between VPP and the kernel through the tap (interface) 0 port.

OSPF, add OSPF service to the LOOP0 port in VPP, and map OSPF to the kernel. At this time, FRR (FastReroute) establishes OSPF neighbors with the client side through the mapping interface, and can also introduce routing policies and metric values to the BGP protocol. The primary link is configured with a smaller metric value, and the backup link is configured with a larger metric value.

ZEBRA can synchronize the learned routes to the kernel, which then notifies VPP of the addition and deletion of routing information through netlink (network) messages.

BGP establishes an IBGP neighbor relationship with the POP, and then publishes it to OSPF by default. It also introduces routing policies and metrics and publishes them to the OSPF protocol.

The data transmission method based on the SDWAN primary and backup links may specifically include the following steps:

Step 201, mapping the first OSPF to the primary link kernel, and establishing a primary link OSPF neighbor;

In actual applications, the first OSPF in the SDWAN main link can be mapped to the main link kernel to generate an OSPF mapping interface, so that the SDWAN device of the SDWAN main link is connected to the client-side device through the OSPF mapping interface to establish a main link OSPF neighbor.

Step 202, mapping the second OSPF to the backup link kernel, and establishing a backup link OSPF neighbor;

The second OSPF in the SDWAN backup link can be mapped to the backup link kernel to generate an OSPF mapping interface, so that the SDWAN device of the SDWAN backup link is connected to the client-side device through the OSPF mapping interface to establish a backup link OSPF neighbor.

Among them, the client-side device for establishing the main link OSPF neighbor and the client-side device for establishing the backup link OSPF neighbor are the same device, so that the SDWAN main link and the SDWAN backup link can achieve dual-path bypass.

Step 203: Establishing a primary link BGP neighbor based on the first BGP;

In actual applications, the first BGP in the SDWAN main link can establish a main link BGP neighbor with the POP side device to achieve the connection of the uplink of the SDWAN main link.

Step 204: Establish a backup link BGP neighbor based on the second BGP;

The second BGP in the SDWAN backup link can establish a backup link BGP neighbor with the POP side device to achieve the connection of the uplink of the SDWAN backup link.

The POP-side device for establishing the primary link BGP neighbor and the backup link BGP neighbor is the same device.

On the SDWAN main link, establish the main link OSPF neighbor and the main link BGP neighbor; on the SDWAN backup link, establish the backup link OSPF neighbor and the backup link BGP neighbor. The connection diagram can be seen in Figure 4. The SDWAN client (i.e. uCPE1, uCPE2) publishes the routing information inside the headquarters through OSPF in the headquarters network. The routing information is published to the domain cloud through the BGP protocol of the SDWAN device, and can also be interconnected with the SDWAN devices in other branches.

Step 205, controlling the main link BGP neighbor to publish routes to the main link OSPF neighbor, and controlling the main link OSPF neighbor to publish routes to the main link BGP neighbor, so that the first OSPF and the first BGP perform bidirectional republishing of routes;

After the SDWAN main link completes the establishment of network neighbors, that is, in the SDWAN main link, the BGP-based uplink and OSPF-based downlink connections are completed. At this time, the main link BGP neighbor can be controlled to publish routes to the main link OSPF neighbor, that is, to send routes from the cloud to the user end through the first BGP; and the main link OSPF neighbor can be controlled to publish routes to the main link BGP neighbor, that is, to send routes from the user end to the cloud through the first OSPF. At this time, both the first OSPF and the first BGP send routes to the other end, that is, the first OSPF and the first BGP perform bidirectional re-publishing of routes.

Step 206, controlling the backup link BGP neighbor to publish routes to the backup link OSPF neighbor, and controlling the backup link OSPF neighbor to publish routes to the backup link BGP neighbor, so that the second OSPF and the second BGP perform bidirectional republishing of routes;

After the SDWAN backup link completes the establishment of network neighbors, that is, in the SDWAN backup link, the BGP-based uplink and OSPF-based downlink connections are completed. At this time, the backup link BGP neighbor can be controlled to publish routes to the backup link OSPF neighbor, that is, to send routes from the cloud to the user end through the second BGP; and the backup link OSPF neighbor can be controlled to publish routes to the backup link BGP neighbor, that is, to send routes from the user end to the cloud through the second OSPF. At this time, both the second OSPF and the second BGP send routes to the other end, that is, the second OSPF and the second BGP perform bidirectional re-publishing of routes.

Step 207: When the first OSPF and the first BGP perform bidirectional redistribution of routes, obtain a first metric value of the SDWAN primary link;

Since the metric value is introduced in the SDWAN main link, the metric value is the first metric value, which is generated when sending routes between the first OSPF and the first BGP. That is, the first metric value of the SDWAN main link can be obtained when the first OSPF and the first BGP perform bidirectional redistribution of routes.

Step 208: When the second OSPF and the second BGP perform bidirectional republishing of routes, obtain a second metric value of the SDWAN backup link;

A metric value is also introduced in the SDWAN backup link. The metric value is the second metric value, which is generated when sending routes between the second OSPF and the second BGP. That is, the second metric value of the SDWAN backup link can be obtained when the second OSPF and the second BGP perform bidirectional redistribution of routes.

Step 209, comparing the first metric value and the second metric value, and determining a target SDWAN link from the SDWAN primary link and the SDWAN backup link;

The first metric value and the second metric value are compared to determine that the link for data transmission in the uplink and downlink of the SDWAN main link and the uplink and downlink of the SDWAN backup link is the target SDWAN link.

Specifically, the first metric value includes a first uplink metric value and a first downlink metric value, and the second metric value includes a second uplink metric value and a second downlink metric value; and the step of comparing the first metric value and the second metric value to determine the target SDWAN link from the SDWAN primary link and the SDWAN backup link includes:

Sub-step S2091, comparing the first uplink metric value and the second uplink metric value to determine a target uplink metric value;

In an embodiment of the present invention, the first metric value includes a first uplink metric value and a first downlink metric value. The first uplink metric value is the metric value of the SDWAN uplink main link, and the first downlink metric value is the metric value of the SDWAN downlink main link. The second metric value includes a second uplink metric value and a second downlink metric value. The second uplink metric value is the metric value of the SDWAN uplink backup link, and the second downlink metric value is the metric value of the SDWAN downlink backup link.

The first uplink metric value and the second uplink metric value can be compared to screen the SDWAN uplink main link and the SDWAN uplink backup link to determine the target uplink metric value.

Furthermore, the step of comparing the first uplink metric value and the second uplink metric value to determine a target uplink metric value includes: judging the size relationship between the first uplink metric value and the second uplink metric value; when the first uplink metric value is smaller than the second uplink metric value, determining the first uplink metric value to be the target uplink metric value; when the second uplink metric value is smaller than the first uplink metric value, determining the second metric value to be the target uplink metric value.

In practical applications, the magnitude relationship between the first uplink metric value and the second uplink metric value can be determined; wherein, the magnitude comparison method can be a difference method, a comparison method, a number axis method, etc.; the embodiment of the present invention is not limited. When the first uplink metric value is less than the second uplink metric value, the first uplink metric value is determined to be the target uplink metric value; when the second uplink metric value is less than the first uplink metric value, the second metric value is determined to be the target uplink metric value. That is, the smaller of the first uplink metric value and the second uplink metric value is determined as the target uplink metric value.

Sub-step S2092, comparing the first downlink metric value and the second downlink metric value to determine a target downlink metric value;

The first downlink metric value is compared with the second downlink metric value, the SDWAN downlink main link and the SDWAN downlink backup link are screened, and the target downlink metric value is determined.

Further, the step of comparing the first downlink metric value and the second downlink metric value to determine the target downlink metric value includes: judging the size relationship between the first downlink metric value and the second downlink metric value; when the first downlink metric value is smaller than the second downlink metric value, determining the first downlink metric value as the target downlink metric value; when the second downlink metric value is smaller than the first downlink metric value, determining the second metric value as the target downlink metric value.

The magnitude relationship between the first downlink metric value and the second downlink metric value can be determined; wherein, the magnitude comparison method can be a difference method, a comparison method, a number axis method, etc.; and can be the same as the comparison method of the first uplink metric value and the second uplink metric value, or can be different; the embodiment of the present invention is not limited. When the first downlink metric value is less than the second downlink metric value, the first downlink metric value is determined to be the target downlink metric value; when the second downlink metric value is less than the first downlink metric value, the second metric value is determined to be the target downlink metric value. That is, the smaller of the first downlink metric value and the second downlink metric value is determined as the target downlink metric value.

Sub-step S2093, determining that the SDWAN uplink corresponding to the target uplink metric value is the uplink of the target SDWAN link; wherein the SDWAN uplink corresponding to the target uplink metric value is the uplink of the SDWAN primary link or the uplink of the SDWAN backup link;

After determining the target uplink metric value, the SDWAN uplink corresponding to the target uplink metric value can be determined as the uplink of the target SDWAN link. That is, when the target uplink metric value is the first uplink metric value, the SDWAN uplink corresponding to the target uplink metric value is the uplink of the SDWAN main link. When the target uplink metric value is the second uplink metric value, the SDWAN uplink corresponding to the target uplink metric value is the uplink of the SDWAN backup link.

Sub-step S2094, determining that the SDWAN downlink corresponding to the target downlink metric value is the downlink of the target SDWAN link; wherein, the SDWAN downlink corresponding to the target downlink metric value is the downlink of the SDWAN main link or the downlink of the SDWAN backup link.

After determining the target downlink metric value, the SDWAN downlink corresponding to the target downlink metric value can be determined as the downlink of the target SDWAN link. That is, when the target downlink metric value is the first downlink metric value, the SDWAN downlink corresponding to the target downlink metric value is the downlink of the SDWAN main link. When the target downlink metric value is the second downlink metric value, the SDWAN downlink corresponding to the target downlink metric value is the downlink of the SDWAN backup link.

Step 210, using the target SDWAN link for data transmission;

Determine the target SDWAN link and use it for data transmission; implement route publishing in SEWAN and reduce the probability of failure through primary and backup links.

Specifically, the step of using the target SDWAN link for data transmission includes: using the downlink of the target SDWAN link to transmit data with a preset user-side device; using the uplink of the target SDWAN link to transmit data with a preset cloud-side device.

After determining the uplink of the target SDWAN link and the downlink of the target SDWAN link, the downlink of the target SDWAN link can be used to transmit data with the preset user-side device; data interaction can be performed with the preset user-side device through the downlink of the target SDWAN link. The downlink of the target SDWAN link can be used to transmit data with the preset cloud-side device; data interaction can be performed with the preset cloud-side device through the uplink of the target SDWAN link.

Referring to Figure 5, the uplinks in the SDWAN main link and the SDWAN backup link are connected to the cloud, and the downlinks in the SDWAN main link and the SDWAN backup link are connected to the user end. The uplink of the target SDWAN link is determined from the two uplinks, and data is interacted with the cloud; the downlink of the target SDWAN link is determined from the two downlinks, and data is interacted with the user end.

Step 211, in the target SDWAN link, a preset routing policy is introduced when routing is bidirectionally redistributed;

In actual applications, bidirectional re-publishing may cause some device route learning errors because the SDWAN main link will learn the routes published to the backup device in the cloud. At this time, you can obtain the routing policy to prevent the formation of routing loops and avoid routing errors. When the route is bidirectionally re-published in the target SDWAN link, introduce the routing policy to ensure that the target SDWAN link will not form a routing loop.

In an optional embodiment of the present invention, the routing policy includes a boundary label value, and the step of introducing a preset routing policy when bidirectionally redistributing routing in the target SDWAN link includes:

Sub-step S2121, in the target SDWAN link, a route identifier is introduced when the route is bidirectionally redistributed, and the route identifier carries a route label value;

In actual applications, the routes learned from the cloud will be marked with a tag. When they are published into BGP again, learning and publishing routes with this tag value is prohibited. Therefore, the routing policy can include a boundary label value (tag value).

In the target SDWAN link, the route identifier sent by each part of the target SDWAN link is introduced when the route is bidirectionally republished, wherein the route identifier also carries the route label value, and the route label value is expressed in the same way as the tag value.

Sub-step S2122: importing the route corresponding to the routing identifier according to the routing label value and the boundary label value.

Whether to import the route corresponding to the route identifier is determined based on the relationship between the route label value and the boundary label value.

Specifically, the step of introducing the route corresponding to the routing identifier based on the routing label value and the boundary label value includes: determining whether the routing label value and the boundary label value are the same; when the routing label value and the boundary label value are the same, refusing to introduce the route corresponding to the routing identifier; when the routing label value and the boundary label value are different, introducing the route corresponding to the routing identifier.

Compare the route label value and the boundary label value to determine whether they have the same value. If the route label value and the boundary label value are the same, accessing the route will form a loop, and the route corresponding to the route identifier is rejected; if the route label value and the boundary label value are different, accessing the route will not form a loop, and the route corresponding to the route identifier can be introduced.

Specifically, please refer to Figure 6. The main SDWAN device corresponding to the SDWAN main link can learn the routing information from the BGP dotted line part, and can also learn the routing in the cloud from the solid line process. At this time, the routing policy is introduced: the routes learned from BGP are marked with tags, and the routes with this tag value are prohibited from being republished into the BGP protocol.

In an optional embodiment of the present invention, the method further includes:

Step S1, receiving updated routing information;

When user-side devices connected to the SDWAN primary link and SDWAN backup link are added or deleted, updated routing information will be generated, and the updated routing information can be received at this time.

Step S2: updating the primary link OSPF neighbor and the backup link OSPF neighbor according to the updated routing information.

The first OSPF in the SDWAN main link and the second OSPF in the SDWAN backup link can add or delete user-side devices that establish connections based on the content in the updated routing information to update the main link OSPF neighbors and the backup link OSPF neighbors.

In addition, the uplink can forward data based on LTE. For example, refer to Figure 7. The LAN (Local Area Network) port in the VPP of the above software architecture receives data packets; the message is sent to the LOOP0 port of the gateway bvi in the message. The message at the entrance of the LOOP0 port searches for a route and points the destination IP to the opposite subnet at the ipsec port; after ipsec encapsulation, a new IP header is added and the route search continues; the route is searched and the default route is taken through LOOP0 to tap0; after receiving the packet, the kernel tap0 searches for a route and takes the default route to ppp0. Finally, it is sent out from LTE. The kernel needs to turn off the return route check to ensure that the return data can be sent to the VPP normally through the kernel.

In order to make the process of switching the SDWAN primary and backup links clear, an example is given to illustrate:

For normal link conditions, please refer to Figure 5.

Uplink: The client side will learn the routes in the cloud or the Internet box from the primary and backup SDWAN devices (SDWAN primary link). Since the primary metric value is smaller, the client side will give priority to the primary SDWAN device.

Downlink: The POP side will also select the primary SDWAN device based on the metric value published by BGP.

(2) When the LAN link of the primary device fails, as shown in Figure 8,

Uplink: If the LAN link status is down, the client will immediately sense the LAN side disconnection. If the network is unavailable, the client will sense the LAN side service disconnection when the OSPF dead time times out. At this time, the backup SDWAN device (SDWAN backup link) will be preferred.

Downlink: The active SDWAN device will also immediately sense when the LAN link status is down. If the network is unavailable, it will sense that the LAN service is disconnected when the OSPF dead time times out, and then synchronize the routing information to BGP and publish it to the POP. After the POP senses it, it will also switch to the standby SDWAN device.

When the LTE link of the active device fails:

Uplink: The primary SDWAN device will sense the LTE link failure within the BGP timeout period and publish it to the client side through OSPF. After sensing, the client selects the backup SDWAN box.

Downlink: POP will sense LTE link failure within the BGP timeout period, and then POP will select a backup SDWAN box.

When the service is running on the backup link, when the primary link is fully restored, the data service will be switched back to the primary link.

Compared with the traditional VRRP to realize the master-slave and the separate OSPF routing protocol or BGP routing protocol to realize the master-slave link, the embodiment of the present invention uses the BGP protocol to ensure that the traditional access POP mode remains unchanged, and can support the release of OSPF routes on the LAN side. The bidirectional route redistribution solution is highly compatible by introducing routing policies and is compatible with devices with other FRR software architectures.

It should be noted that, for the sake of simplicity, the method embodiments are described as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present invention are not limited by the described action sequence, because according to the embodiments of the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

9, a structural block diagram of an embodiment of a data transmission device based on the SDWAN primary and backup links of the present invention is shown, wherein the SDWAN primary link includes a first open shortest path first protocol OSPF and a first border gateway protocol BGP, and the SDWAN backup link includes a second OSPF and a second BGP. The data transmission device based on the SDWAN primary and backup links may specifically include the following modules:

The first acquisition module 901 is used to obtain the first metric value of the SDWAN primary link when the first OSPF and the first BGP perform bidirectional route redistribution;

The second acquisition module 902 is used to obtain the second metric value of the SDWAN backup link when the second OSPF and the second BGP perform bidirectional re-publishing of routes;

A comparison module 903 is used to compare the first metric value and the second metric value, and determine a target SDWAN link from the SDWAN primary link and the SDWAN backup link;

The transmission module 904 is used to use the target SDWAN link to transmit data.

In an optional embodiment of the present invention, the SDWAN main link further includes a main link kernel, and the SDWAN backup link further includes a backup link kernel; the device further includes:

A first establishing module, used for mapping the first OSPF to the primary link kernel to establish a primary link OSPF neighbor;

The second establishing module is used to map the second OSPF to the backup link kernel and establish a backup link OSPF neighbor.

In an optional embodiment of the present invention, the device further comprises:

A third establishing module, used to establish a primary link BGP neighbor based on the first BGP;

The fourth establishing module is used to establish a backup link BGP neighbor based on the second BGP.

In an optional embodiment of the present invention, the device further comprises:

A first control module, used for controlling the main link BGP neighbor to publish routes to the main link OSPF neighbor, and controlling the main link OSPF neighbor to publish routes to the main link BGP neighbor, so that the first OSPF and the first BGP perform bidirectional re-publishing of routes;

The second control module is used to control the backup link BGP neighbor to publish routes to the backup link OSPF neighbor, and control the backup link OSPF neighbor to publish routes to the backup link BGP neighbor, so that the second OSPF and the second BGP perform bidirectional re-publishing of routes.

In an optional embodiment of the present invention, the device further comprises:

A receiving module, used for receiving updated routing information;

An updating module is used to update the primary link OSPF neighbor and the backup link OSPF neighbor according to the updated routing information.

In an optional embodiment of the present invention, the device further comprises:

The third acquisition module is used to acquire the routing strategy;

An execution module is used to execute the routing policy in the target SDWAN link.

In an optional embodiment of the present invention, the routing strategy includes a boundary label value, and the execution module includes:

A reading submodule, configured to read a routing identifier in the target SDWAN link, wherein the routing identifier carries a routing label value;

The access submodule is used to introduce the route corresponding to the routing identifier according to the routing label value and the boundary label value.

In an optional embodiment of the present invention, the access submodule includes:

A first judging unit, configured to judge whether the routing label value and the boundary label value are the same;

a rejecting unit, configured to reject the route corresponding to the routing identifier when the routing label value is the same as the boundary label value;

The access unit is used to introduce the route corresponding to the routing identifier when the routing label value and the boundary label value are different.

In an optional embodiment of the present invention, the first metric value includes a first uplink metric value and a first downlink metric value, and the second metric value includes a second uplink metric value and a second downlink metric value; and the comparison module 903 includes:

A first comparison submodule, configured to compare the first uplink metric value with the second uplink metric value to determine a target uplink metric value;

A second comparison submodule, configured to compare the first downlink metric value with the second downlink metric value to determine a target downlink metric value;

An uplink determination submodule, used to determine that the SDWAN uplink corresponding to the target uplink metric value is the uplink of the target SDWAN link; wherein the SDWAN uplink corresponding to the target uplink metric value is the uplink of the SDWAN primary link or the uplink of the SDWAN backup link;

The downlink determination submodule is used to determine that the SDWAN downlink corresponding to the target downlink metric value is the downlink of the target SDWAN link; wherein, the SDWAN downlink corresponding to the target downlink metric value is the downlink of the SDWAN main link or the downlink of the SDWAN backup link.

In an optional embodiment of the present invention, the first comparison submodule includes:

A second judging unit, configured to judge a magnitude relationship between the first uplink metric value and the second uplink metric value;

A first uplink metric value determining unit, configured to determine that the first uplink metric value is the target uplink metric value when the first uplink metric value is less than the second uplink metric value;

A second uplink metric value determining unit is configured to determine the second uplink metric value as the target uplink metric value when the second uplink metric value is smaller than the first uplink metric value.

In an optional embodiment of the present invention, the second comparison submodule includes:

A third judgment unit, used to judge the magnitude relationship between the first downlink metric value and the second downlink metric value;

A first downlink metric value determining unit, configured to determine that the first downlink metric value is the target downlink metric value when the first downlink metric value is less than the second downlink metric value;

The second downlink metric value determining unit is configured to determine the second downlink metric value as the target downlink metric value when the second downlink metric value is smaller than the first downlink metric value.

In an optional embodiment of the present invention, the transmission module 904 includes:

An uplink transmission submodule, used to use the downlink of the target SDWAN link to transmit data with a preset user-side device;

The downlink transmission submodule is used to use the uplink of the target SDWAN link to transmit data with the preset cloud-side device.

As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

An embodiment of the present invention further provides an electronic device, including:

A processor and a storage medium, wherein the storage medium stores a computer program executable by the processor, and when the electronic device is running, the processor executes the computer program to perform the method as described in any one of the embodiments of the present invention. The specific implementation method and technical effect are similar to those of the method embodiment, and will not be repeated here.

The storage medium may include a random access memory (RAM) or a non-volatile memory, such as at least one disk storage. Optionally, the storage medium may also be at least one storage device located away from the aforementioned processor.

The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to execute the method as described in any one of the embodiments of the present invention. The specific implementation method and technical effect are similar to those of the method embodiment, and will not be repeated here.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Those skilled in the art will appreciate that the embodiments of the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

The embodiments of the present invention are described with reference to the flowcharts and/or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and/or box in the flowchart and/or block diagram, as well as the combination of the processes and/or boxes in the flowchart and/or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate a device for implementing the functions specified in one process or multiple processes in the flowchart and/or one box or multiple boxes in the block diagram.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce computer-implemented processing, so that the instructions executed on the computer or other programmable terminal device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

The above is a detailed introduction to a data transmission method, device, electronic device and storage medium based on the SDWAN primary and backup links provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims (15)

1. A data transmission method based on SDWAN primary and backup links, characterized in that the SDWAN primary link includes a first open shortest path first protocol OSPF and a first border gateway protocol BGP, and the SDWAN backup link includes a second OSPF and a second BGP, and the method includes: When the first OSPF and the first BGP perform bidirectional republishing of routes, obtaining a first metric value of the SDWAN primary link; When the second OSPF and the second BGP perform bidirectional republishing of routes, obtaining a second metric value of the SDWAN backup link; Comparing the first metric value with the second metric value, determining a target SDWAN link from the SDWAN primary link and the SDWAN backup link; The target SDWAN link is used for data transmission. 2. The method according to claim 1, characterized in that the SDWAN main link further includes a main link kernel, and the SDWAN backup link further includes a backup link kernel; the method further includes: Mapping the first OSPF to the primary link kernel to establish a primary link OSPF neighbor; The second OSPF is mapped to the backup link kernel to establish a backup link OSPF neighbor. 3. The method according to claim 2, characterized in that the method further comprises: Based on the first BGP, establish a primary link BGP neighbor; Based on the second BGP, a backup link BGP neighbor is established. 4. The method according to claim 3, characterized in that the method further comprises: Control the main link BGP neighbor to publish routes to the main link OSPF neighbor, and control the main link OSPF neighbor to publish routes to the main link BGP neighbor, so that the first OSPF and the first BGP perform bidirectional re-publishing of routes; The backup link BGP neighbor is controlled to publish routes to the backup link OSPF neighbor, and the backup link OSPF neighbor is controlled to publish routes to the backup link BGP neighbor, so that the second OSPF and the second BGP perform bidirectional republishing of routes. 5. The method according to claim 2, characterized in that the method further comprises: Receive updated routing information; The primary link OSPF neighbor and the backup link OSPF neighbor are updated according to the updated routing information. 6. The method according to claim 1, characterized in that the method further comprises: In the target SDWAN link, a preset routing strategy is introduced when the routes are bidirectionally redistributed. 7. The method according to claim 6, characterized in that the routing policy includes a boundary label value, and the step of introducing a preset routing policy when bidirectionally redistributing the routing in the target SDWAN link comprises: In the target SDWAN link, a route identifier is introduced when the route is bidirectionally redistributed, and the route identifier carries a route label value; The route corresponding to the routing identifier is introduced according to the routing label value and the boundary label value. 8. The method according to claim 7, wherein the step of introducing the route corresponding to the routing identifier according to the routing label value and the boundary label value comprises: Determining whether the routing label value and the boundary label value are the same; When the routing label value is the same as the boundary label value, refusing to import the route corresponding to the routing identifier; When the routing label value and the boundary label value are different, the route corresponding to the routing identifier is introduced. 9. The method according to claim 1, characterized in that the first metric value includes a first uplink metric value and a first downlink metric value, and the second metric value includes a second uplink metric value and a second downlink metric value; the step of comparing the first metric value and the second metric value and determining the target SDWAN link from the SDWAN primary link and the SDWAN backup link comprises: Comparing the first uplink metric value with the second uplink metric value to determine a target uplink metric value; Comparing the first downlink metric value with the second downlink metric value to determine a target downlink metric value; Determine that the SDWAN uplink corresponding to the target uplink metric value is the uplink of the target SDWAN link; wherein the SDWAN uplink corresponding to the target uplink metric value is the uplink of the SDWAN primary link or the uplink of the SDWAN backup link; Determine that the SDWAN downlink corresponding to the target downlink metric value is the downlink of the target SDWAN link; wherein, the SDWAN downlink corresponding to the target downlink metric value is the downlink of the SDWAN main link or the downlink of the SDWAN backup link. 10. The method according to claim 9, wherein the step of comparing the first uplink metric value with the second uplink metric value to determine a target uplink metric value comprises: Determine a magnitude relationship between the first uplink metric value and the second uplink metric value; When the first uplink metric value is less than the second uplink metric value, determining the first uplink metric value to be the target uplink metric value; When the second uplink metric value is less than the first uplink metric value, the second metric value is determined to be the target uplink metric value. 11. The method according to claim 9, wherein the step of comparing the first downlink metric value with the second downlink metric value to determine a target downlink metric value comprises: Determine a magnitude relationship between the first downlink metric value and the second downlink metric value; When the first downlink metric value is less than the second downlink metric value, determining the first downlink metric value to be the target downlink metric value; When the second downlink metric value is less than the first downlink metric value, the second metric value is determined to be the target downlink metric value. 12. The method according to claim 9, wherein the step of using the target SDWAN link for data transmission comprises: Using the downlink of the target SDWAN link to perform data transmission with a preset user-side device; The uplink of the target SDWAN link is used to transmit data with the preset cloud-side device. 13. A data transmission device based on SDWAN primary and backup links, characterized in that the SDWAN primary link includes a first open shortest path first protocol OSPF and a first border gateway protocol BGP, and the SDWAN backup link includes a second OSPF and a second BGP, and the device includes: A first acquisition module, used for acquiring a first metric value of the SDWAN primary link when the first OSPF and the first BGP perform bidirectional republishing of routes; A second acquisition module is used to obtain a second metric value of the SDWAN backup link when the second OSPF and the second BGP perform bidirectional republishing of routes; A comparison module, configured to compare the first metric value and the second metric value, and determine a target SDWAN link from the SDWAN primary link and the SDWAN backup link; A transmission module is used to use the target SDWAN link to transmit data. 14. An electronic device, characterized in that it comprises a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein when the computer program is executed by the processor, the steps of the data transmission method based on the SDWAN primary and backup links are implemented as described in any one of claims 1 to 12. 15. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the data transmission method based on the SDWAN primary and backup links as described in any one of claims 1 to 12 are implemented.