WO2022121466A1

WO2022121466A1 - Data processing method and device for ethernet virtual private network, and storage medium

Info

Publication number: WO2022121466A1
Application number: PCT/CN2021/121710
Authority: WO
Inventors: 易放军
Original assignee: 中兴通讯股份有限公司
Priority date: 2020-12-07
Filing date: 2021-09-29
Publication date: 2022-06-16
Also published as: CN114666267A

Abstract

A data processing method and device for an Ethernet virtual private network, and a storage medium. The data processing method comprises: receiving a routing advertisement sent by a first node, and obtaining routing information according to the routing advertisement (S100); merging the routing information on the basis of the same ESI, so as to obtain a forwarding table, wherein each forwarding entry in the forwarding table is composed of a network port identifier, ESI, and identifier value of the first node (S200); when a BUM packet is forwarded to the first node, searching in the forwarding table for a first identifier value (S300); encapsulating the first identifier value in the BUM packet according to an encapsulation structure of the BUM packet (S400); and forwarding the BUM packet to the first node, such that the first node decapsulates the BUM packet and filters local forwarding ports according to the first identifier value obtained by means of decapsulation (S500).

Description

Data processing method, device and storage medium of Ethernet virtual private network

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with the application number of 202011417069.6 and the filing date of December 07, 2020, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is incorporated herein by reference.

technical field

The present application relates to the field of communication technologies, and in particular, to a data processing method, device and storage medium for an Ethernet virtual private network.

Background technique

In the Ethernet Virtual Private Network (EVPN), when a client edge CE (Custom Edge) device is connected to multiple operator edge PE (Provider Edge) devices, multiple Ethernet segments ES (Ethernet Segments) are to be divided. ) and set the corresponding Ethernet segment label ESI (Ethernet Segment Identifier) for each ES to realize the orderly forwarding of packets between devices.

To forward broadcast, unknown unicast, and multicast BUM (Broadcast, Unkown-unicast, and Multicast) packets in the EVPN, the loopback problem needs to be solved. In the current data processing method, the receiving end device of the BUM packet forms a forwarding table according to the route, so as to prevent the receiving end device from forwarding the BUM packet to other devices under the same ES. However, when the number of PE devices and ESs increases, the forwarding table The more label resources are consumed, and the forwarding tables need to be formed for different EVPN services, so a lot of forwarding table resources are occupied, which is not conducive to the effective use of forwarding table resources.

SUMMARY OF THE INVENTION

The following is an overview of the topics detailed in this article. This summary is not intended to limit the scope of protection of the claims.

The embodiments of the present application provide a data processing method, device and storage medium for an Ethernet virtual private network, which combine multiple routes originating from the same PE in the same ES to form a forwarding table, thereby reducing the occupation of forwarding table resources.

In a first aspect, an embodiment of the present application provides a data processing method for an Ethernet virtual private network, where the Ethernet virtual private network includes a first node and a second node that are adjacent nodes to each other, and the data processing method is applied to all The second node, including:

Receive a routing advertisement sent by the first node and obtain routing information according to the routing advertisement, where the routing information includes an Ethernet segment identifier ESI and a label value corresponding to the ESI;

Combining the routing information based on the same ESI to obtain a forwarding table, each forwarding table entry of the forwarding table is composed of the network port identifier of the first node, the ESI and the label value;

When forwarding a broadcast, unknown unicast, and multicast BUM message to the first node, the forwarding table is searched with the network port identifier of the first node and the first ESI corresponding to the source port of the BUM message, determine the first tag value;

Encapsulating the first label value in the BUM packet according to the encapsulation structure of the BUM packet to obtain a BUM encapsulation packet; and

The BUM-encapsulated message is forwarded to the first node, so that the first node decapsulates the BUM-encapsulated message and filters a local forwarding port according to the decapsulated first label value.

In a second aspect, an embodiment of the present application further provides a data processing method for an Ethernet virtual private network, where the Ethernet virtual private network includes a first node and a second node that are adjacent nodes to each other, and the data processing method is applied to The first node includes:

Obtain the ESI corresponding to the local port and assign a label value to the ESI, and construct a local lookup table whose entry is the ESI and the label value;

When receiving the BUM-encapsulated message forwarded by the second node, decapsulate the BUM-encapsulated message and determine the first label value in the BUM-encapsulated message;

Look up the local lookup table according to the first tag value to determine the first ESI; and

The local forwarding port is filtered according to the first ESI.

In a third aspect, an embodiment of the present application further provides a device, comprising at least one processor and a memory for being communicatively connected to the at least one processor; the memory stores a memory that can be executed by the at least one processor Instructions, which are executed by the at least one processor, so that the at least one processor can execute the data processing method of the Ethernet virtual private network of the first aspect or the second aspect.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, where the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause a computer to execute the foregoing first aspect or the second A data processing method for an Ethernet virtual private network in the aspect.

The data processing method for an Ethernet virtual private network provided by the embodiment of the present application has at least the following beneficial effects: when the local device dual-homes to the first node and the second node that are mutually adjacent nodes, and the local device sends a BUM report to the second node message, after the second node receives the BUM message, in order to avoid the formation of a message loop when forwarding the BUM message to the first node, according to the ESI corresponding to the first node and the label corresponding to the ESI stored in the second node value, encapsulate the label value in the BUM packet and forward it to the first node. After receiving the encapsulated BUM packet, the first node decapsulates the packet, locates the field where the label value is located, and filters the local forwarding port according to the corresponding relationship between the ESI and the label value stored in the first node to prevent the packet from forming a loop. The embodiment of the present application does not need to distinguish the EVPN service instance of the BUM packet when forwarding the BUM packet, thereby reducing the size of the forwarding table and reducing the occupation of forwarding table resources.

Other features and advantages of the present application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the description, claims and drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification. They are used to explain the technical solutions of the present application together with the examples of the present application, and do not constitute a limitation on the technical solutions of the present application.

1 is a flowchart of a data processing method for a second node provided by an embodiment of the present application;

FIG. 2 is a flowchart of establishing a forwarding table by a second node provided by an embodiment of the present application;

3 is a flowchart of a data processing method of a first node provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of information exchange under the multi-homed network structure provided by the example of this application; and

FIG. 5 is a schematic diagram of an apparatus structure of a device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

The embodiments of the present application provide a data processing method, device, and storage medium for an Ethernet virtual private network. A forwarding table is constructed based on the correspondence between ESI and label value. When a BUM message needs to be forwarded, a search is performed based on the ESI corresponding to the BUM message. The label value in the forwarding table, and the obtained label value is encapsulated in the BUM packet, so that when the device with the same ESI receives the BUM packet, the local forwarding port is filtered according to the label value in the BUM packet. The construction of the above-mentioned forwarding table can reduce the occupation of forwarding table resources because there is no need to distinguish the EVPN service instances of the BUM packets.

The embodiments of the present application will be further described below with reference to the accompanying drawings.

1 , an embodiment of the present application provides a data processing method for an Ethernet virtual private network. The Ethernet virtual private network includes a first node and a second node that are adjacent nodes to each other. The data processing method is applied to the second node, including But it is not limited to the following steps S100, S200, S300, S400 and S500.

Step S100, receiving a routing advertisement sent by the first node and obtaining routing information according to the routing advertisement, where the routing information includes an Ethernet segment identifier ESI and a label value corresponding to the ESI;

In the existing EVPN, if a CE device is connected to multiple PE devices, the CE device belongs to multiple PE devices. In this case, when the CE device reports BUM The PE device that receives the BUM packet will forward the BUM packet to other PE devices, and other PE devices will forward the BUM packet to the CE device after receiving the BUM packet, resulting in loopback of the BUM packet. . In order to overcome the above problems, RFC (Request For Comments) 7432 proposes to use the ES filter table to solve the problem of packet loopback, and allocate MPLS (Multi-Protocol Label Switching, multi-protocol label switching, multi-protocol labels) based on each platform to PE devices in multi-homing scenarios. After the BUM packet is reported to the current PE device from the ES port, if the current PE device forwards the BUM packet to the neighboring PE device, the BUM packet carries the corresponding ESI label value. , after receiving the BUM packet with the label value, the neighboring PE device recognizes and obtains the ESI corresponding to the label value, so that it no longer forwards to the local port with the same ESI.

However, under the specification of RFC7432, the PE device that receives the BUM message forms a forwarding table according to the routing information corresponding to each advertised route of the adjacent PE device. The resulting forwarding table is huge and consumes a lot of tag resources.

Based on this, in order to simplify the forwarding table, the embodiment of the present application uniformly manages the label values of BUM packets in the EVPN multi-homing scenario, and combines redundant routing information according to route advertisements to form a system that is suitable for multiple service scenarios at the same time. Forwarding tables, such as:

Step S200, combining routing information based on the same ESI to obtain a forwarding table, each forwarding table entry in the forwarding table is composed of the network port identifier, ESI and label value of the first node.

In this embodiment of the present application, the first node and the second node represent two adjacent PE devices. Through step S100, the first node sends a routing advertisement to the second node, and the routing information of the routing advertisement includes the corresponding local port of the first node. The ESI and the label value assigned by the first node corresponding to different ESIs. After the second node obtains the route advertisement through the port between the first node and the first node, it forms a forwarding table in the second node according to the routing information. The content of the forwarding table It includes at least the above-mentioned ESI, the label value corresponding to the ESI, and the network port identifier of the first node.

It can be understood that the route advertisement should also include the service information corresponding to the local port of the first node. For example, taking the first node in FIG. 1 as an example, there are three AC (Attachment Circuits) connected to the first node. ), each AC corresponds to a port, and the service instances of the port include MPLS and SRv6. In this embodiment, EVPN1, EVPN2 and EVPN3 are respectively used to represent its EVPN instance information. In this way, each route sent by the first node to the second node The advertisements all contain ESI-label value-EVPN instance information. According to the specification of RFC7432, the second node preliminarily forms a preliminary filtering table of the network port identifier-ESI-label value-EVPN instance information of the first node. It is divided by specific service types under EVPN, so the preliminary filter table formed under the three AC lines will occupy a lot of resources, and this is the filter table formed according to the RFC7432 specification; the embodiment of the present application attributes the first node in the preliminary filter table to the first node. The routing information of the same ESI is merged, and the EVPN instance information is removed to simplify the preliminary filtering table and reduce the occupation of label resources. Since the EVPN identifier is removed, the second node does not need to consider the EVPN service instance when encapsulating and forwarding BUM packets, which improves the speed of table lookup and encapsulation.

The forwarding table obtained by simplifying the above step S200, its entry is composed of the network port identifier of the first node-ESI-label value, different service instances under the same ESI share a label value, and is applicable to services such as MPLS and SRv6 at the same time. The traditional forwarding table can only be applied to the problem of MPLS EVPN. It should be understood that in the traditional forwarding table established for MPLS EVPN services, the first node needs to allocate a label value for each ES in the MPLS label space, so that the ESI and the label value form a corresponding relationship. MPLS labels are added, and when there are only SRv6 EVPN services in the Ethernet segment, the label value of the MPLS label space is also occupied, which is not conducive to EVPN label allocation. Since there is no need to distinguish service instances in this embodiment of the present application, the label value can be set according to needs when assigning it. The ESI assigns the label value, and the specific value range of the label value can also be defined as needed, as long as the label value and the ESI can form a one-to-one correspondence, which solves the problem of MPLS label occupation.

Step S300, when forwarding the broadcast, unknown unicast, and multicast BUM messages to the first node, look up the forwarding table with the network port identifier of the first node and the first ESI corresponding to the source port of the BUM message, and determine the first label value .

After receiving the BUM message, the second node determines the broadcast members of the BUM message, determines that the first node is an adjacent node, and forwards the BUM message to the first node; assuming that the first node and the second node are in the same ES, then the first node and the second node have the same ESI, the BUM message needs to be specially processed, so that the first node can break the loop after receiving the BUM message; if the first node and the second node If they are not in the same ES, when the second node queries the forwarding table according to the first ESI corresponding to the BUM packet, the corresponding forwarding table entry cannot be found, so the second node does not need to encapsulate the BUM packet when forwarding the BUM packet to the first node. Label value.

When the first node and the second node are in the same ES, and the first node and the second node have the same ESI, the forwarding table is searched based on the network port identifier of the first node and the first ESI corresponding to the source port of the BUM packet. , you can find the forwarding table entry of the network port identifier of the first node-first ESI-first label value, so as to obtain the first label value, and then encapsulate the obtained first label value in a BUM message, A BUM encapsulated packet is formed and sent to the first node.

Step S400: Encapsulate the first label value in the BUM packet according to the encapsulation structure of the BUM packet to obtain a BUM encapsulated packet.

It can be understood that, since the forwarding table of this embodiment of the present application does not distinguish EVPN service instances, the service instance of the BUM packet needs to be judged before encapsulation. The encapsulation locations of the label values are different, which will be described in detail later for the encapsulation methods of BUM packets of different encapsulation formats.

Step S500: Forward the BUM-encapsulated message to the first node, so that the first node decapsulates the BUM-encapsulated message and filters the local forwarding port according to the decapsulated first label value.

The encapsulated BUM packet carries the first label value. When the first node receives the BUM encapsulated packet, it can locate the location of the first label value through decapsulation. According to the difference between the first label value and the first ESI Corresponding relationship, the first node can filter the local forwarding port, that is, as long as the port in the same ES will not forward the BUM packet, thereby avoiding the formation of packet loopback.

The embodiment of the present application reduces the occupation of label resources by simplifying the forwarding table, and does not occupy MPLS label resources in the label space. On this basis, the BUM packet loopback problem of different service instances is solved; the solution of the embodiment of the present application is easy to The implementation has high practical value.

According to the above step S100, the routing information obtained by the second node after receiving the route advertisement includes, in addition to the ESI and the label value, the network port identifier of the first node and the EVPN instance information published by the first node based on the Ethernet virtual private network EVPN instance. The network port identifier can be represented by an IP address, which is used to indicate the destination IP of sending, or can be set based on the MAC address, and can also be used to determine the next hop of the route. On the other hand, the route advertisement carries EVPN service instance information corresponding to the service type used by the local port in the first node, which is used to indicate the service type used by the local port. It can be seen from this that in the process of forming the forwarding table of the embodiment of the present application, the second node needs to organize and simplify the above-mentioned original data to obtain the final forwarding table. Therefore, referring to FIG. 2 , in step S100, the routing information is merged to create a forwarding table. The forwarding table includes but is not limited to the following steps S110 and S120.

Step S110, forming a preliminary filtering table according to the routing information, and each filtering table entry of the preliminary filtering table is composed of the network port identifier of the first node, the EVPN instance information, the ESI and the label value. ;

Step S120, combining the filtering entries with the same ESI to remove the EVPN instance information to obtain a forwarding table.

The preliminary filtering table directly formed by the routing information, the filtering table entry contains the network port identifier of the first node-ESI-label value-EVPN instance information, based on the simplification method of the embodiment of the present application, the same network port The information of different EVPN instances under one ESI is merged to form an entry of network port identifier-ESI, which is distinguished by label value, thereby finally forming a forwarding table whose forwarding table entry is network port identifier-ESI-label value. After receiving the BUM packet, the second node determines to which network port identifier to forward the BUM packet, and determines the first ESI corresponding to the source port of the BUM packet. The text is packaged.

It can be understood that there are multiple ESIs and multiple tag values in the forwarding table, so the above-mentioned first ESI and the first tag value are respectively used to represent one of the ESIs and one of the many tag values in the multiple forwarding tables, and There is no specific numerical limitation on the first ESI and the first tag value.

BUM packets are encapsulated in different encapsulation locations according to different service types. First, after the second node receives the BUM packet, it needs to determine whether the service type of the BUM packet is suitable for the service type applicable to the current label value encapsulation method. When the service type of the BUM packet conforms to the preset service type, according to The packet encapsulation structure corresponding to the preset service type determines the encapsulation position of the label value. When the service type of the BUM packet does not conform to the preset service type, the BUM packet should be encapsulated and sent in other ways.

The above-mentioned preset service types can be set as required, and are not limited here. The embodiments of the present application illustrate the encapsulation position of the label value in the BUM packet under two different service types by way of example.

The first case:

When the service type of the BUM packet is multi-protocol label switching MPLS EVPN, according to the packet encapsulation structure corresponding to MPLS EVPN, the first label value is placed in the field after VPN Label in the encapsulation structure.

The packet structure of the MPLS EVPN service has a label stack, including a top label (or outer label) and a bottom label (or inner label, stack bottom label). It is transmitted to the adjacent PE device, and the bottom label is used to instruct the CE device to which the PE device sends the packet data. Therefore, in order to filter the local forwarding port in the first node, the first label value should be added in the bottom label. Specifically, the first label value can be placed in the field behind the VPN Label. When the first node receives the BUM-encapsulated packet, it decapsulates the BUM-encapsulated packet and matches it to the VPN Label. If the VPN Label is not at the bottom of the stack, then the following field is the value of the first label, which is used to find the ESI to achieve The message is broken.

Second case:

When the BUM packet is an IPv6 segment routing SRv6 EVPN service packet, according to the encapsulation structure of the SRv6 EVPN service packet, the first label value is filled in the Argument field of the SRv6 SID in the encapsulation structure.

The packet structure of the SRv6 EVPN service is represented by Segment id (SID for short) to represent the IPv6 address format. The SID is divided into two fields, Locator and Function. Locator is used for label routing, and Function is used to define the received device. Action after this tag. Therefore, in order to filter the local forwarding port in the first node, the first label value should be added in the Function field. Specifically, the label can be placed in the Argument field in the Function field. When the first node receives the BUM-encapsulated packet, it decapsulates the BUM-encapsulated packet and matches the Function field, and obtains the first label value by taking the part of the Argument field, which is used to find the ESI to break the packet.

Referring to 4, an embodiment of the present application also provides a data processing method for an Ethernet virtual private network, where the Ethernet virtual private network includes a first node and a second node that are mutually adjacent nodes, and the data processing method is applied to the first node, Including but not limited to the following steps S600, S700, S800 and S900.

Step S600, obtaining the ESI corresponding to the local port and assigning a label value to the ESI, and constructing a local lookup table whose entry is the ESI and the label value;

Step S700, when receiving the BUM encapsulated message forwarded by the second node, decapsulate the BUM encapsulated message and determine a first label value in the BUM encapsulated message;

Step S800, look up the local lookup table according to the first tag value, and determine the first ESI;

Step S900, filtering the local forwarding port according to the first ESI.

Corresponding to the above-mentioned embodiment applied to the second node, the embodiment of the present application is applied to the first node, and the work to be performed by the first node includes decapsulating the BUM encapsulation message sent by the second node, and locating the BUM encapsulation packet. The position of the label value in the packet is searched according to the first label value to obtain the ESI, so as to filter the local forwarding port, that is, when the ES corresponding to the ESI and the ES where the local forwarding port is located are the same, the local forwarding port will not be forwarded. BUM message.

It can be understood that the first node should also obtain the ES where the local forwarding port is located, and assign a label value to the ESI corresponding to the ES. In the routing advertisement sent by the first node to the second node, send the ESI and ESI to the second node. The label value corresponding to the ESI, so that the second node establishes the forwarding table required by the embodiment of the present application.

Since the label value allocated for the ESI in the first node is not allocated in the traditional label space (such as MPLS label space), it is not defined according to the range of the traditional label value, because the label value in this embodiment of the present application needs to be located after the service label Therefore, it is a context label for assigning ES entities. The context label needs to rely on each platform label to determine its behavior. This feature corresponds to the behavior of locating the first label value in the BUM encapsulation message.

In the above step S700, for BUM-encapsulated packets of different service types, the first node needs to determine the corresponding service type after decapsulating the BUM-encapsulated packets, in order to locate the label value in it, which can be implemented in the following ways:

Determine the EVPN service type of BUM-encapsulated packets;

When the service type of the BUM-encapsulated packet is multi-protocol label switching MPLS EVPN, it matches the VPN Label in the BUM-encapsulated packet, confirms that the VPN Label field is not the bottom of the label stack, and determines that the label at the bottom of the stack is the first label value;

When the service type of the BUM encapsulated packet is an IPv6 segment routing SRv6 EVPN service packet, locate the Function field of the SRv6 SID, and determine that the Argument field in the Function field is the first label value.

The above judgment process corresponds to the process of encapsulating the BUM packet by the second node. In the decapsulation process, when the service type is MPLS EVPN, the VPN Label is matched, and it is judged whether the VPN Label is a stack bottom label, and if not, then The field after VPN Label is the first label value. When the service type is SRv6 EVPN, locate the Function field of the SRv6 SID, and find the Argument field from the Function field, thereby determining the first tag value.

The embodiment of the present application is applied to an EVPN multi-homing scenario. The first node and the second node are connected to the same CE device as two adjacent PE devices. The network port identifier of the node constructs the forwarding table, which does not distinguish EVPN service instances, thereby reducing the occupation of label resources in the forwarding table. When the CE device sends a BUM packet to the second node, according to the corresponding relationship between the first ESI and the first label value, the found first label value is encapsulated in an appropriate position in the BUM packet, and then sent to the first node. Then, the first node can filter the local forwarding port according to the first label value after decapsulation, so as to realize the packet loop breaking.

The embodiments of the present application will be described below with an actual example:

Referring to Figure 4, this example is provided with three PE devices, which are represented by A device, B device, and C device respectively. The three PE devices are adjacent to each other, where A device and B device belong to the same ES, and C device and B device. They do not belong to the same ES. There are three ACs under device A and device B. For convenience, the ACs under the same ES have the same names, namely AC1 (the service type is MPLS-EVPN1) and AC2 (the service type is MPLS) -EVPN2) and AC3 (service type is SRv6-EVPN3).

Since device A and device B belong to the same ES, device A assigns a tag value of 1 to ES1 in an independent space (for the sake of illustration, the networking in the example only divides one ES, which is represented by ES1. If there are multiple ESs, then It can be represented by ES2, ES3, ..., ESn in turn), since each ES has a unique ESI, the corresponding relationship between ESI1 and label value 1 is formed in the A device (ES2, ES3, ..., ESn respectively correspond to the unique identifier ESI2 , ESI3, …, ESIn).

Device A sends a route advertisement to device B, and device B learns the IP port of device A (represented by IP-a), ESI1, label value 1, and the EVPN instance information corresponding to the three ACs. Device B obtains the information by sorting out the above information. The preliminary filter table has a total of three entries, see Figure 4, which are:

IP-a+ESI1+EVPN1: label value 1

IP-a+ESI1+EVPN2: label value 1

IP-a+ESI1+EVPN3: label value 1

According to the method of this example, the above preliminary filter table is simplified, and the EVPN service type information is removed after merging, and the entries that constitute the forwarding table are obtained:

IP-a+ESI1: tag value 1

When device B receives a BUM packet sent by one of the ACs (the source port belongs to ES1 and has the value of ESI1), and determines that the BUM packet needs to be forwarded to device A and device C, the data packets forwarded to device A need to be labeled An encapsulation of value 1. Using the entry search in the forwarding table above, we can see that the BUM packet corresponding to ESI1 sent to IP-a can be determined to be the label value 1, so that the label value 1 is encapsulated in the BUM packet; when the service type of the BUM packet is MPLS For EVPN, the label value 1 is pushed to the bottom of the label stack. When the service type of the BUM packet is SRv6 EVPN, the label value 1 is filled in the Argument field of the SID, and the BUM encapsulated packet is finally obtained and sent to device A. However, since device C and device B do not belong to the same ES, they send packets to device C according to the conventional BUM packet forwarding method without carrying the label value.

After receiving the BUM-encapsulated packet, device A decapsulates the packet to determine the label value. For the BUM-encapsulated packet of MPLS EVPN type, if the VPN Label is not the bottom of the stack, the label at the bottom of the stack is the label value of 1. For the BUM of SRv6 EVPN type After encapsulating the packet, after determining the service through the Function field, take the Argument field to obtain the label value 1; device A filters out the three AC lines belonging to ES1 according to the corresponding relationship between the label value 1 obtained through decapsulation and ESI1.

An embodiment of the present application further provides a device, comprising at least one processor and a memory for communicating with the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor , so that at least one processor can execute the aforementioned data processing method of the Ethernet virtual private network.

Referring to FIG. 5 , it is taken as an example that the control processor 1001 and the memory 1002 in the device 1000 may be connected through a bus. As a non-transitory computer-readable storage medium, the memory 1002 can be used to store non-transitory software programs and non-transitory computer-executable programs. Additionally, memory 1002 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk memory, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 1002 may optionally include memory located remotely from control processor 1001, which may be connected to device 1000 via a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

Those skilled in the art can understand that the device structure shown in FIG. 5 does not constitute a limitation on the device 1000, and may include more or less components than the one shown, or combine some components, or arrange different components.

Embodiments of the present application further provide a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and the computer-executable instructions are executed by one or more control processors, for example, as shown in FIG. 5 . The execution of one control processor 1001 of the above-mentioned one or more control processors can cause the above-mentioned one or more control processors to execute the data processing method of the Ethernet virtual private network in the above-mentioned method embodiments, for example, to perform the above-described method steps S100 to S500 in FIG. 1 . , the method steps S110 to S120 in FIG. 2 and the method steps S600 to S900 in FIG. 3 .

The data processing method for an Ethernet virtual private network provided by the embodiment of the present application has at least the following beneficial effects: when the local device is dual-homed to the first node and the second node that are mutually adjacent nodes, and the local device sends a BUM message to the second node message, after the second node receives the BUM message, in order to avoid the formation of a message loop when forwarding the BUM message to the first node, according to the ESI corresponding to the first node and the label corresponding to the ESI stored in the second node value, encapsulate the label value in the BUM packet and forward it to the first node. After receiving the encapsulated BUM packet, the first node decapsulates the packet, locates the field where the label value is located, and filters the local forwarding port according to the corresponding relationship between the ESI and the label value stored in the first node to prevent the packet from forming a loop. The embodiment of the present application does not need to distinguish the EVPN service instance of the BUM packet when forwarding the BUM packet, thereby reducing the size of the forwarding table and reducing the occupation of forwarding table resources.

The apparatus embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

Those of ordinary skill in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile implemented in any method or technology for storage of information, such as computer readable instructions, data structures, program modules or other data flexible, removable and non-removable media. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, magnetic disk storage or other magnetic storage devices, or may Any other medium used to store desired information and which can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and can include any information delivery media, as is well known to those of ordinary skill in the art .

The above is a specific description of the preferred implementation of the application, but the application is not limited to the above-mentioned embodiments. Those skilled in the art can also make various equivalent deformations or replacements on the premise of not violating the spirit of the application. These Equivalent modifications or substitutions are included within the scope defined by the claims of the present application.

Claims

A data processing method for an Ethernet virtual private network, wherein the Ethernet virtual private network includes a first node and a second node that are adjacent nodes to each other, and the data processing method is applied to the second node, comprising:

Receive a routing advertisement sent by the first node and obtain routing information according to the routing advertisement, where the routing information includes an Ethernet segment identifier ESI and a label value corresponding to the ESI;

Combining the routing information based on the same ESI to obtain a forwarding table, each forwarding table entry of the forwarding table is composed of the network port identifier of the first node, the ESI and the label value;

When forwarding a broadcast, unknown unicast, and multicast BUM message to the first node, the forwarding table is searched with the network port identifier of the first node and the first ESI corresponding to the source port of the BUM message, determine the first tag value;

Encapsulating the first label value in the BUM packet according to the encapsulation structure of the BUM packet to obtain a BUM encapsulation packet; and

The BUM-encapsulated message is forwarded to the first node, so that the first node decapsulates the BUM-encapsulated message and filters a local forwarding port according to the decapsulated first label value.
The data processing method for an Ethernet virtual private network according to claim 1, wherein the routing information further comprises a network port identifier of the first node and an EVPN instance published by the first node based on the Ethernet virtual private network EVPN instance information.
The data processing method for an Ethernet virtual private network according to claim 2, wherein the routing information is combined based on the same ESI to obtain a forwarding table, comprising:

A preliminary filtering table is formed according to the routing information, and each filtering table entry of the preliminary filtering table is composed of the network port identifier of the first node, the EVPN instance information, the ESI and the label value; and

The filtering table entries with the same ESI are combined to remove the EVPN instance information to obtain a forwarding table.
The data processing method for an Ethernet virtual private network according to claim 2 or 3, wherein the network port identifier is an IP address.
The data processing method for an Ethernet virtual private network according to claim 1, wherein the encapsulating the first label value in the BUM packet according to the encapsulation structure of the BUM packet, comprising:

When the service type of the BUM packet conforms to the preset service type, the encapsulation position of the first label value is determined according to the packet encapsulation structure corresponding to the preset service type.
The data processing method for an Ethernet virtual private network according to claim 5, wherein the determining the encapsulation position of the first label value according to the packet encapsulation structure corresponding to the preset service type comprises:

When the service type of the BUM message is multi-protocol label switching MPLS EVPN, according to the message encapsulation structure corresponding to MPLS EVPN, the first label value is placed in the field behind the VPN Label in the encapsulation structure; and

When the BUM message is an IPv6 segment routing SRv6 EVPN service message, according to the encapsulation structure of the SRv6 EVPN service message, the first label value is filled in the Argument field of the SRv6 SID in the encapsulation structure.
A data processing method for an Ethernet virtual private network, the Ethernet virtual private network includes a first node and a second node that are adjacent nodes to each other, the data processing method is applied to the first node, and the data processing Methods include:

Obtain the ESI corresponding to the local port and assign a label value to the ESI, and construct a local lookup table whose entry is the ESI and the label value;

When receiving the BUM-encapsulated message forwarded by the second node, decapsulate the BUM-encapsulated message and determine the first label value in the BUM-encapsulated message;

Look up the local lookup table according to the first tag value to determine the first ESI; and

The local forwarding port is filtered according to the first ESI.
The data processing method for an Ethernet virtual private network according to claim 7, wherein the decapsulating the BUM encapsulation packet and determining the first label value in the BUM encapsulation packet comprises:

Determine the EVPN service type of the BUM encapsulated message;

When the service type of the BUM encapsulated message is multi-protocol label switching MPLS EVPN, it is matched to the VPN Label in the BUM encapsulated message, it is determined that the VPN Label field is not the bottom of the label stack, and it is determined that the label at the bottom of the stack is the first a tag value; and

When the service type of the BUM encapsulation message is an IPv6 segment routing SRv6 EVPN service message, locate the Function field of the SRv6 SID, and determine that the Argument field in the Function field is the first label value.
An apparatus comprising at least one processor and a memory for communicative connection with the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor One processor executes, so that the at least one processor can execute the data processing method of the Ethernet virtual private network as claimed in any one of claims 1 to 6 or execute the Ethernet virtual private network as claimed in claim 7 or 8. data processing method.
A computer-readable storage medium storing computer-executable instructions for causing a computer to execute the Ethernet virtual private network according to any one of claims 1 to 6 The data processing method or the data processing method of the Ethernet virtual private network according to claim 7 or 8 is implemented.