WO2021135397A1

WO2021135397A1 - Message transfer method and related device

Info

Publication number: WO2021135397A1
Application number: PCT/CN2020/115726
Authority: WO
Inventors: 李久勇
Original assignee: 华为技术有限公司
Priority date: 2019-12-31
Filing date: 2020-09-17
Publication date: 2021-07-08
Also published as: CN113132202A; CN113132202B

Abstract

Disclosed in the embodiments of the present application are a message transfer method and a related device. A first device receives a first message from a second device, the first message comprising a message type indicator used for indicating that the first message is a unicast message or a BUM message; when the first device determines, according to the message type indicator, the first message is a unicast message, or when the first device determines, according to the message type indicator, the first message is a BUM message and the first device is a DF of a target device, the first device sends a second message to the target device; wherein the second message is a message obtained after the first device performs de-encapsulation on the first message, the target device, by multi-homing means, accesses multiple network devices, and the multiple network devices comprise the first device. The present method can achieve a target device being able to receive a message, and only receiving one message among messages with the same content.

Description

A message transmission method and related equipment

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China with the application number 201911415540.5 and the invention title of "a message transmission method and related equipment" on December 31, 2019, the entire content of which is incorporated by reference In this application.

Technical field

This application relates to the field of communication technology, and in particular to a message transmission method and related equipment.

Background technique

In the data center network, server virtualization is gradually being widely used, and with the development of enterprise business, the rapid growth of the number of virtual machines and virtual machine migration have become a normal business. On this basis, virtual extensible local area network (VXLAN) was born. VXLAN is one of the three-layer network virtualization (Network Virtualization over Layer 3, NVO3) standard technologies, and it is essentially a tunneling technology. When packets are forwarded in a VXLAN network, the VXLAN tunnel endpoint (VXLAN tunnel end point, VTEP) connected to the sender (virtual machine or physical machine) can add a VXLAN header to the original packet to obtain the VXLAN packet, and use the traditional Internet protocol The transmission mode of the (Internet Protocol, IP) network forwards the VXLAN message to the VTEP connected to the receiving end (virtual machine or physical machine); the VTEP connected to the receiving end can remove the outer encapsulation part of the VXLAN message and transfer the original The message is sent to the receiving end.

However, in actual applications, after virtual machines are migrated or added in a VXLAN network, it is easy to happen that the destination device migrates or the added virtual machine cannot receive packets or receives multiple identical packets at the same time.

Summary of the invention

In order to solve the above problems, the present application provides a message transmission method and related equipment, so that the receiving end can receive the message sent by the sending end, and only one copy of the same content message can be received.

In the first aspect, this application provides a message transmission method. The first device receives a first message from the second device, the first message includes a message type indication, and the message type indication is used to indicate that the first message is a unicast message or broadcast unknown unicast Multicast BUM message; when the first device determines that the first message is the unicast message according to the message type indication, or when the first device determines according to the message type indication When the first message is the BUM message, and the first device is the designated forwarder DF of the destination device, the first device sends a second message to the destination device; wherein, the second message The text is the message obtained after the first device decapsulates the first message, and the destination device multi-homed accesses multiple network devices, and the multiple network devices include the first device . In this embodiment, when the first device determines that the received message is a unicast message, it directly sends to the destination device, which enables the destination device to receive the message, and when it determines that the received message is a multicast message , Only when the first device is used as the DF of the destination device, can it send a message to the destination device, so that the destination device can receive only one message, which can realize that the destination device can receive the message sent by the sender, and the same Only one copy of the content message can be received.

Optionally, the message type indication is located in the target field in the first message, and/or the message type indication is the multicast carried by the first message after being encapsulated by the multicast tunnel address. In this embodiment, the first device may determine whether the first packet is a unicast packet or a multicast packet according to the value of the target field in the first packet, or it may be based on the IP in the first packet. The address determines whether the first message is a unicast message or a multicast message. When the IP address characterizes the IP address of a single device, it characterizes that the first message is a unicast message, and when the IP address is a multicast IP address, It can be characterized that the first message is a BUM message, so that the first device can determine the message type of the first message according to the IP address in the first message.

Optionally, the first message is a VXLAN message including a VXLAN header of a virtual extensible local area network, and the target field is specifically a reserved field in the VXLAN header. In this embodiment, the first message may be a VXLAN message including a VXLAN header, so that the value of a reserved field in the VXLAN header can be defined to indicate whether the first message is a unicast message or a BUM message. Types of. In this way, the first device can determine the type of the first packet according to the value of the specific reserved field in the VXLAN header of the first packet. For example, you can define the BUM flag bit in the VXLAN header, and when the value of the BUM flag bit is defined as 0, it indicates that the first packet is a unicast packet, and when the value of the BUM flag bit is defined as 1, it indicates the first packet. It is a BUM message.

Optionally, the method further includes: when the first device determines that the first packet is the BUM packet according to the packet type indication, and the first device is not the target device When the forwarder DF is designated, the first device does not send the second packet to the destination device. In this embodiment, when the first device determines that the first message is a BUM message, but it is not a DF message of the destination device, it means that the destination device can obtain the message from another device (the DF of the destination device), so that The first device does not send a message to the destination device, for example, the message may be discarded, so that the destination device does not repeatedly receive at least two messages with the same content.

In the second aspect, this application also provides a message transmission device, which includes a receiving module, a processing module, and a sending module:

The receiving module is configured to receive a first message from a second device, where the first message includes a message type indication, and the message type indication is used to indicate that the first message is a unicast message or broadcast Unknown unicast multicast BUM message;

The processing module is configured to: when it is determined that the first message is the unicast message according to the message type indication, or when it is determined that the first message is the BUM according to the message type indication When the first device is the designated forwarder DF of the destination device, a second packet is sent to the destination device through the sending module; wherein, the second packet is the response of the first device to the first packet In the message obtained after the message is decapsulated, the destination device is connected to multiple network devices, and the multiple network devices include the first device.

Optionally, the message type indication is located in the target field in the first message, and/or the message type indication is the multicast carried by the first message after being encapsulated by the multicast tunnel address.

Optionally, the first message is a VXLAN message including a VXLAN header of a virtual extensible local area network, and the target field is specifically a reserved field in the VXLAN header.

Optionally, the apparatus further includes: the processing module is further configured to: when the first device determines that the first packet is the BUM packet according to the packet type indication, and the first device is not When it is the DF of the destination device, it is determined not to send the second packet to the destination device.

The message transmission device described in the second aspect corresponds to the message transmission method described in the first aspect. Therefore, various possible implementations and beneficial effects of the second aspect can be referred to the corresponding implementations in the first aspect and The relevant description of the beneficial effects will not be repeated here.

In the third aspect, this application also provides a computer device. The device computer includes a processor and a memory, the memory is used to store a computer program or instruction, and the processor is used to execute the computer program or instruction, so that the computer device executes the first aspect or any one of the implementation manners in the first aspect. The message transmission method described.

In a fourth aspect, the present application provides a computer storage medium storing a program for implementing the message transmission method described in the first aspect or any one of the implementation manners in the first aspect. When the program runs in a device for message transmission, the device is caused to execute the message transmission method described in the first aspect or any one of the implementation manners in the first aspect.

In a fifth aspect, the present application provides a computer program product, the program product includes a program, and when the program is run, the message transmission method described in the first aspect or any one of the first aspects is carried out.

It can be seen from the above technical solutions that in this application, the first device receives the first message from the second device. The first message includes a message type indication, and the message type indication is used to indicate the first message. The message is a unicast message or a broadcast unknown unicast multicast BUM message; when the first device determines that the first message is the unicast message according to the message type indication, or when the When the first device determines that the first packet is the BUM packet according to the packet type indication, and the first device is the designated forwarder DF of the destination device, the first device sends the first device to the destination device. Two messages; wherein, the second message is a message obtained after the first device decapsulates the first message, and the destination device accesses multiple network devices in multiple ways, the The plurality of network devices includes the first device. It can be seen that when the first device determines that the received message is a unicast message, it directly sends it to the destination device, which enables the destination device to receive the message, and when it determines that the received message is a BUM message, only the first device The device only sends packets to the destination device when it is the DF of the destination device, so that the destination device can receive only one packet, which can realize that the destination device can receive the packets sent by the sender and the packets with the same content You can receive only one copy.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some of the implementations recorded in the present application. For example, for those of ordinary skill in the art, other drawings can be obtained based on these drawings.

FIG. 1 is a schematic diagram of an exemplary VXLAN network architecture in an embodiment of this application;

Figure 2 is a schematic diagram of signaling interaction of a message transmission method in an embodiment of the application;

Figure 3 is a schematic diagram of the VXLAN message format;

4 is a schematic diagram of the hardware structure of the main control board of the device in an embodiment of the application;

FIG. 5 is a schematic diagram of the hardware structure of the interface board of the device in an embodiment of the application;

FIG. 6 is a schematic diagram of the hardware structure of a device in an embodiment of the application;

Fig. 7 is a schematic structural diagram of a message transmission device in an embodiment of the application.

Detailed ways

This application provides a message transmission method to solve the scenario where a terminal device (such as a virtual machine, a server, a personal computer, a palmtop computer, etc.) is connected to multiple access devices in multiple ways. The terminal device receives multiple messages. The problem. In the following, with reference to the accompanying drawings, a VXLAN network is taken as an example to illustrate the message transmission method provided in this application.

As shown in FIG. 1, it is a schematic structural diagram of a VXLAN network provided by an embodiment of this application. The VXLAN network is superimposed on a leaf-spine structured data center network. The data center network includes a leaf layer and a backbone layer. The leaf layer includes multiple leaf devices, such as leaf1 to leaf4 in the figure. The backbone layer includes one or more spine devices (one is shown in the figure), and each leaf device Communicate with other leaf devices through the spine device. Each terminal device can access one leaf device (called single-homing) or simultaneously access multiple leaf devices (called multi-homing). This application focuses on the scenario where a terminal device is connected to multiple leaf devices. For example, if a virtual machine (VM) 1 is multi-homed to leaf1 and leaf2, and VM2 is multi-homed to leaf3 and leaf4, leaf1 and leaf2 belong to In the same multi-homing access group, leaf3 and leaf4 belong to the same multi-homing access group.

In the VXLAN network shown in Figure 1, corresponding VTEPs (VTEP1, VTEP2, VTEP3, and VTEP4) can be deployed on leaf1 to leaf4. Among them, different VTEPs have different IP addresses, and the packets during communication between VM1 and VM2 are transmitted through the VTEP on the leaf node.

Taking VM1 to VM2 as an example, VM1 can send the original message to VTEP1 on the leaf1 node (of course, it can also be sent to VTEP2 on the leaf2 node, here VTEP1 is used as an example), and VTEP1 can receive The received original message encapsulates the VXLAN header to obtain the VXLAN message. Then, by looking up the local MAC table, it can be determined that the VXLAN message is sent to VTEP3 (the message can be transmitted to VTEP3 via the spine in Figure 1, which is assumed to be sent here) VTEP3 can also be sent to VTEP4 in practical applications). VTEP3 decapsulates the received VXLAN message to obtain the original message, and can determine that the original message is sent to VM2 by looking up the corresponding entry in the local MAC table, so that the original message sent by VM1 can be Transfer to VM2.

Generally, if there are forwarding entries for VM2 in the local MAC tables of VTEP1 and VTEP3, the message can be successfully transmitted to VM2 based on the corresponding entries in the local MAC tables of VTEP1 and VTEP3. However, when there is no forwarding entry for VM2 in the local MAC table of VTEP1, VTEP1 usually searches the head-end copy list, and copies and VXLAN the packet according to the head-end copy list to generate the data sent to VTEP3 and VTEP4. Broadcast an unknown unicast multicast (broadcast, unknown-unicast, multicast, BUM) message, and send the BUM message to VTEP3 and VTEP4. In this way, both VTEP3 and VTEP4 can receive a BUM message, and if the local MAC entries of VTEP3 and VTEP4 both store forwarding entries for VM2, VTEP3 and VTEP4 can respectively forward the message to VM2. As a result, VM2 receives two duplicate packets, which causes a waste of network resources.

Or, when a forwarding entry for VM2 is stored in the local MAC table of VTEP1, VTEP1 can send unicast packets to VTEP3 or VTEP4. For example, it can be determined to send unicast packets to VTEP3 or VTEP4 through load sharing. Wait. At this time, if VTEP3 receives a message and there is no forwarding entry for VM2 in the VTEP3 local MAC table, VTEP3 usually triggers the designated forwarder (DF) function. When the VTEP3 is not the DF of VM2 VTEP3 will not send a message to VM2, and VTEP4, which is the DF of VM2, cannot send a message to VM2 because it has not received the unicast message sent by VTEP1, so that VM2 cannot receive the message sent by VM1. . Among them, the DF function refers to assigning a VTEP to each VM as a DF in a multi-homing access group, which is responsible for forwarding messages to the VM, and other non-DF VTEPs will not send messages to the connected VM.

In practical applications, when VM2 is a migrated VM or a newly-added VM, VTEP1 and VTEP3 may not learn the MAC address of the VM2, and it is easy to appear that there is no VM2 correspondence in the local MAC table of VTEP1 or the local MAC table of VTEP3 In the case of forwarding entries, VM2 may receive multiple duplicate packets or fail to receive packets. However, in the process of message forwarding, the situation of sending multiple messages or discarding messages needs to be avoided.

Based on this, the embodiment of the present application provides a message transmission method, so that VM2 can receive the message sent by VM1 and only receives one copy of the message. In specific implementation, after VM1 sends the original message to VTEP1, VTEP1 can encapsulate the VXLAN header of the received original message to obtain the VXLAN message, and set in the VXLAN message to indicate that the first message is a single The broadcast message is the message type indication of the BUM message. Then, VTEP1 can send the encapsulated VXLAN message to VTEP3. After VTEP3 receives the VXLAN message, it can obtain the message type indication from the VXLAN message.

In this way, when VTEP3 determines that the VXLAN message received by VTEP3 is a unicast message according to the message type indication, it indicates that VTEP1 has only sent a VXLAN message, and only VTEP3 has received the VXLAN message. At this time, VTEP3 can Decapsulate the VXLAN packet, and send the original packet directly to VM2 so that VM2 can obtain the original packet. Otherwise, VM2 cannot obtain the original packet from other VTEPs, so that the original packet can be avoided. The text is lost.

When VTEP3 determines that the VXLAN message is a BUM message according to the message type indication, it indicates that VTEP1 has sent multiple VXLAN messages, that is, in addition to VTEP3 receiving the message, there are other VTEPs that have also received the message. Therefore, if it is determined that VTEP3 is the DF of VM2, VTEP3 can send the original message obtained by decapsulating the VXLAN message to VM2, and if it is determined that VTEP3 is not the DF of VM2, then VTEP3 does not need to send the original message to VM2. Message. In this way, VM2 only receives the original message from the VTEP as the DF, and will not receive the original message from other VTEPs, so that it can avoid receiving multiple copies of the same message.

It is worth noting that the VXLAN network shown in Figure 1 is only used as an example and is not used for limitation. For example, in actual applications, the multi-homed access device in the VXLAN network to which the embodiment of this application applies can be a virtual machine VM, but also a device such as a physical machine; for another example, the VXLAN network to which the embodiment of this application applies It can also support single-homing, three-homing, and four-homing access of virtual or physical machines. For another example, the network to which the embodiment of the present application is applicable may also be a campus network or an enterprise network.

The following describes in detail various non-limiting specific implementation manners of a message transmission method in the embodiments of the present application with reference to the accompanying drawings. Referring to FIG. 2, FIG. 2 shows a schematic diagram of signaling interaction of a message transmission method in an embodiment of the present application. This method can be applied to the VXLAN network shown in FIG. 1, and may specifically include:

S201: The source device sends a second message to the second device.

In this embodiment, as shown in FIG. 2, when the source device needs to send a message to another device (destination device), the message may be transmitted to the destination device through the second device and the first device in turn. Exemplarily, when this embodiment is applied to the VXLAN network shown in FIG. 1, the source device may specifically be VM1 that needs to send a message to VM2 in FIG. 1, and the destination device may be VM2, and the first device may be VTEP3 in Figure 1 is either the leaf3 device that carries the VTEP3 (of course, it can also be VTEP4 or the leaf4 device that carries VTEP4), and the second device can be the VTEP1 in Figure 1 or the leaf1 device that carries the VTEP1 (of course, also It can be VTEP2 or a leaf2 device carrying VTEP2).

During the message transmission process, the source device can send the original message (hereinafter referred to as the second message) that needs to be transmitted to the destination device to the second device, so that the second device can process and process the second message accordingly. Forward.

S202: The second device encapsulates the second message to obtain the first message. The first message includes a message type indication, and the message type indication is used to indicate whether the first message is a unicast message or a BUM message. Text.

During specific implementation, the second device and the first device may perform packet transmission based on tunnel technology. As the tunnel endpoint, the second device can encapsulate the VXLAN header for the second packet, and set the corresponding packet in the VXLAN header according to whether the first packet to be sent is a unicast packet or a BUM packet during the encapsulation process The type indication, so that the encapsulated first message includes the type indication of the first message.

In an exemplary implementation, the message type indication may specifically be a reserved field in the VXLAN header. As shown in Figure 3, when the second device encapsulates the second message, it can add a VXLAN header, a User Datagram Protocol (UDP) header, an outer IP header, and an outer layer to the original data frame in sequence. Ethernet frame header, where the VXLAN header can include a 24-bit VXLAN network identifier (VXLAN network identifier, VNI) field and an 8-bit VXLAN flag bit field. The remaining fields are reserved fields. You can use one of the reserved fields. One or more fields are used to indicate whether the first message is a unicast message or a BUM message. For example, you can define any one or more bits in the 8-bit reserved field after the VXLAN flag bit field as the BUM flag bit, and define that the value of the BUM flag bit is 0 to indicate that the first packet is a unicast packet. When the value of the reserved field is 1 or other non-zero values, it indicates that the first packet is a BUM packet. Correspondingly, when the second device encapsulates the VXLAN header for the first message, it can set the corresponding value (0 or non-zero value) in the reserved field according to whether the message to be sent is a unicast message or a BUM message. , So that the first message includes a message type indication.

In the foregoing embodiment, the value of the field is defined to indicate the type of the first packet. In other possible implementation manners, it may also be based on the outer destination IP address of the first packet to indicate the received Whether the message is a unicast message or a BUM message. As shown in FIG. 3, the outer IP header of the first message encapsulated by the second device may include the IP address of the destination VTEP (of course, it may also include the IP address of the source VTEP, etc.). If the second device wants to send a unicast packet, the IP address of the destination VTEP in the outer IP header of the first packet can be a single IP address, so that the second device can only send a unicast packet to one device; If the second device wants to send a BUM packet, the IP address of the destination VTEP in the IP header of the first packet is the range of IP addresses, that is, the IP address of the destination VTEP is specifically included in the range of IP addresses. The IP address of a VTEP, so that the second device can send a BUM message to the multiple VTEPs.

Whether the second device sends a unicast message or a BUM message can be specifically determined by the second device according to the query result of the local MAC table, that is, if the second device can find the corresponding destination MAC address from the local MAC table If the second device fails to find the entry corresponding to the destination MAC address, the second device can send a BUM packet.

In specific implementation, after receiving the second packet sent by the source device, the second device can obtain the destination MAC address of the second packet. For example, the destination MAC address can be parsed from the second packet. And inquire whether the entry corresponding to the destination MAC address is recorded in the locally stored MAC table, where the entry corresponding to the destination MAC address may include, for example, the IP address of the destination VTEP; when the second device looks up from the MAC table When the entry corresponding to the target address is reached, the second device may determine to send a unicast packet to the outbound device corresponding to the searched entry. Accordingly, the packet type indication included in the first packet may specifically be Indicate that the first message is a unicast message; and when the second device cannot find the entry corresponding to the destination MAC address from the MAC table, the second device may determine to send the BUM message.

Take VM1 as shown in Figure 1 sending a message to VM2 as an example. After VM1 sends the original message (that is, the above-mentioned second message) to VTEP1 (that is, the above-mentioned second device), VTEP1 can query the local MAC table, since the entry corresponding to the destination MAC address (that is, the MAC address of VM2) is queried (its outgoing port points to the IP address of VTEP3, that is, the outgoing port is the tunnel entrance), VTEP1 can determine to send unicast packets to VTEP3, The message obtained by encapsulating the original message (that is, the above-mentioned first message) includes a message type indication for indicating that the message is a unicast message.

Table 1

MAC表项MAC table entry	出端口Out port
VM2的MAC地址MAC address of VM2	VTEP3的IP地址IP address of VTEP3

Of course, if there is no entry corresponding to the MAC address of VM2 recorded in the local MAC table of VTEP, VTEP1 can determine to send a BUM message, and generate BUM messages sent to VTEP3 and VTEP4 respectively (that is, the first Message), the generated BUM message may include a message type indication for indicating that the message is a BUM message.

In practical applications, when the message type indication is in the VXLAN header, if the second device finds the entry corresponding to the destination MAC address from the MAC table, it can set the corresponding reserved field in the VXLAN header to indicate The message type indication of the unicast message. If the table entry corresponding to the destination MAC address is not found, the message type indication used to indicate the BUM message can be set in the corresponding reserved field in the VXLAN header.

When the message type indicates the outer destination IP address of the first message, if the second device finds the entry corresponding to the destination MAC address from the MAC table, it can use the IP address corresponding to the found entry as The outer destination IP address, and the packet encapsulation is completed, so that the single destination IP address can be used to indicate that the first packet is a unicast packet. If the table entry corresponding to the destination MAC address is not found, the multicast IP address can be The address is used as the outer destination IP address, so that the multicast IP address can be used to indicate that the first message is a BUM message.

It should be noted that in actual applications, the second device may also determine whether to send a unicast message or a BUM message in other ways. For example, when the second device is configured for intra-domain multicast, it can directly generate a BUM message, instead of determining the type of the sent message by looking up the MAC table entry.

Correspondingly, before sending the first message, the second device may also predetermine which device to send the message to. As an example, when the second device finds a single entry corresponding to the destination MAC address from the MAC table, the outbound device indicated by the entry is the first device. In actual applications, there may be multiple table entries corresponding to the destination MAC address that the second device finds from the MAC table, corresponding to multiple outgoing port devices. For example, in the VXLAN network shown in Figure 1, VTEP1 can find from the local MAC table that the entries corresponding to the MAC address of VM2 are the IP address of VTEP3 and the IP address of VTEP4. At this time, multiple egress port devices can be loaded. Specifically, the device that receives the first packet is determined from the multiple egress devices based on the HASH (hash) algorithm, and the determined device is the above-mentioned first packet. One device. When the second device cannot find the entry corresponding to the destination MAC address from the MAC table, the second device may use the layer 2 network device communicating with the second device as the first device. The second-layer network device refers to a network device that can communicate with a second device through MAC addressing.

S203: The second device sends the first message to the first device.

In this embodiment, after encapsulating the first packet, the second device may send the first packet to the first device based on the traditional IP protocol.

S204: The first device decapsulates the received first message, obtains the second message, and determines whether the first message is a unicast message or a BUM message according to the message type indication included in the first message .

Since the first message is obtained after encapsulating the second message, after receiving the first message, the first device can perform corresponding decapsulation processing on the first message to obtain the second message .

In addition, if the pre-defined or negotiated message type indication is located in the target field of the first message, such as a reserved field in the VXLAN header of the first message, the message type indication can be obtained from the target field of the first message , And determine whether the first message is a unicast message or a BUM message according to the message type indication. For example, one or more reserved fields in the VXLAN header can be defined as the BUM flag bit in advance. When the value of the BUM flag bit is 1, it can be determined that the first packet is a BUM packet, and when the BUM flag bit is When the value of is 0, it can be determined that the first message is a unicast message.

If the pre-defined or negotiated message type indication is specifically the destination IP address in the first message, it can be parsed from the first message whether the destination IP address represents a single IP address or a multicast IP address (that is, it represents Range of multiple IP addresses). When the destination IP address is a single IP address, the first device can determine that the first packet is a unicast packet, and when the destination address is a multicast IP address, the first device can determine that the first packet is a BUM packet .

S205: When the first device determines that the first message is a unicast message, or the first device determines that the first message is a BUM message and the first device is the DF of the destination device, the first device sends the message to the destination device Send the second message.

In this embodiment, when the first device determines that the first packet is a unicast packet, it indicates that the second device only sent the first packet to the first device. Therefore, in order to improve the destination device's ability to obtain the first packet sent by the source device Second, the success rate of the message, the first device may directly send the second message obtained by decapsulating the first message to the destination device. Specifically, after the first device finds the entry corresponding to the destination MAC address from the local MAC table, it can send the second message to the destination device according to the entry, and when the first device cannot find the entry corresponding to the destination MAC address, After the entry corresponding to the MAC address, the second message can be sent to all connected devices. Since the network device multi-homed to the destination device includes the first device, the destination device can usually download from the first device. The second message is received.

In this way, no matter whether the local MAC table of the first device includes the entry corresponding to the destination MAC address, the destination device can receive the second packet, which can avoid when the local MAC table does not record the entry of the destination MAC address. At this time, because the first device is not the DF of the destination device, the first device does not send the second packet to the destination device, thereby avoiding packet loss (that is, the destination device cannot receive the packet).

When the first device determines that the first message is a BUM message, it indicates that the second device has sent BUM messages to multiple devices at the same time. ), the destination device can receive packets from multiple network devices. Based on this, in order to prevent the destination device from receiving multiple second packets from multiple network devices, the DF election function can be triggered, that is, a network device is designated for the destination device to forward packets (the designated network device is DF), and The rest of the network devices that are multi-homed to the destination device cannot send packets to the destination device. Based on this, when the first device determines that the first packet is a BUM packet, it can also determine whether the first device is the DF corresponding to the destination device represented by the destination MAC address. If so, the first device can send the second packet The message is sent to the destination device, and if it is not, the first device may not send the second message to the destination device, for example, the second message may be discarded. In this way, although the destination device is multihomed to multiple network devices, it usually only receives the second message from the DF corresponding to the destination device, which can avoid the situation of multiple packets (that is, the destination device receives multiple duplicate copies). Message).

It is understandable that when the first device determines that the first message received is a unicast message, it can send the second message to the destination regardless of whether there is an entry corresponding to the destination MAC address in the local MAC table. Device, and when the first device determines that the first message received is a BUM message, it sends the second message to the destination device only when the first device is the DF of the destination device. Whether there is an entry corresponding to the destination MAC address recorded in the local MAC table on the second device, the destination device can receive the second message, and only one copy of the second message will be received, which can avoid packet loss or excessive The case of the package.

For the scenario of whether there is an entry corresponding to the destination MAC address recorded in the MAC tables on the first device and the second device, the first device and the second device may have multiple combinations of message sending behaviors, as shown in Table 2:

Table 2

Among them, the "first MAC table record" and "first MAC table not recorded" in the above table respectively represent the entry corresponding to the destination MAC address recorded in the MAC table on the first device and the entry corresponding to the destination MAC address not recorded The entry, "second MAC table record" and "second MAC table not recorded" respectively represent the entry corresponding to the destination MAC address recorded in the MAC table on the second device and the entry corresponding to the destination MAC address not recorded, respectively, The "unicast message" in the forwarding behavior of the second device indicates that the second device sends a unicast message to the first device, and the "BUM message" indicates that the second device sends a BUM message to the first device, and the forwarding behavior of the first device The "unicast message" in this indicates that the first device sends a message to the destination device according to the corresponding entry in the first MAC table, and the "DF sending" indicates that the first device is the DF corresponding to the destination device before sending the message to the destination device. , "Skip DF check and send" means that the first device sends a message to the destination device regardless of whether it is the DF corresponding to the destination device.

It is worth noting that, in one embodiment, the first device and/or the second device in the above method embodiment may include a main control board and an interface board, wherein the main control board and the processor in the interface board can cooperate Cooperate, perform the above actions performed by the first device or the second device, and control the packet forwarding behavior of the Ethernet switch (LAN switch, LSW) in the interface board. Specifically, referring to FIGS. 4 and 5, FIG. 4 shows a schematic diagram of the hardware structure of the main control board, and FIG. 5 shows a schematic diagram of the hardware structure of the interface board.

As shown in Figure 4, the main control board may include a processor 1, an Ethernet interface (used to manage the network port), a physical layer Ethernet interface 1, an Ethernet interface connected to the processor of the interface board, and a volatile memory 1 ( Such as random access memory (RAM, etc.) and non-volatile memory 1 (such as flash memory, etc.). Among them, the processor 1 is respectively connected to the volatile memory 1, the non-volatile memory 1, the Ethernet interface (used for the management network port) and the Ethernet interface connected to the processor 1 of the interface board, and the Ethernet interface (used for The management network port) is connected to the physical layer Ethernet interface 1, and the Ethernet interface connected to the interface board processor 2 is connected to the physical layer Ethernet interface 2.

As shown in FIG. 5, the interface board may include a processor 2, an Ethernet interface connected to the main control board processor 1, an LSW, a physical layer Ethernet interface 3, a volatile memory 2 and a non-volatile memory 2. Among them, the processor 2 is connected to the volatile memory 2, the non-volatile memory 2, the LSW, and the Ethernet interface connected to the main control board processor 1, respectively, and the volatile memory 3 is connected to the LSW.

The processor 1 and the processor 2 can be the control units of the main control board and the interface board, respectively. The running programs and static configuration parameters can be stored in the corresponding non-volatile memory, and the codes executed when the programs are running and related The data can be placed in the corresponding volatile memory. The processor 1 and the processor 2 can cooperate to complete the related operations of the first device or the second device in the above method embodiment, and effectively control the forwarding behavior of the LSW. At the same time, they can also control the initialization of the LSW and the issuance of service entries. , Protocol message sending and receiving, various interrupts (including port online and offline status processing), etc. In addition, the LSW can optionally have an external volatile memory 3, which can be used to store the messages that the first device or the second device needs to send. In some application scenarios, the volatile memory 3 can also alleviate the problem of insufficient internal cache of the LSW chip. The physical layer Ethernet interface 3 connected to the LSW can complete the optical or electrical Ethernet interface docking with the physical layer Ethernet interface 2 on the main control board.

In addition, the embodiment of the present application also provides a schematic diagram of another hardware structure of the above-mentioned first device and/or second device. Refer to FIG. 6, which shows a schematic diagram of the hardware structure of another device in an embodiment of the present application.

The device may be the first device in the foregoing method embodiment, and the device may include at least one processor 601 and at least one memory 602. The processor 601 may be connected to the memory 602, for example, may be connected through a bus 603 as shown in FIG. 6. Of course, in actual applications, the connection between the processor 601 and the memory 602 may include various interfaces, transmission lines, or buses, which are not limited in this embodiment.

The memory 602 may be used to store computer programs or instructions;

The processor 601 may be used to execute the computer program or instruction, and execute the following steps according to the computer program or instruction:

Receive a first message from a second device, where the first message includes a message type indication, and the message type indication is used to indicate that the first message is a unicast message or a broadcast unknown unicast multicast BUM Message

When the first message is determined to be the unicast message according to the message type indication, or when the first message is determined to be the BUM message according to the message type indication, and the When the first device is the designated forwarder DF of the destination device, sending the second message to the destination device;

Wherein, the second message is a message obtained after the first device decapsulates the first message, and the destination device is multi-homed to multiple network devices, and the multiple network devices The first device is included in.

In some possible implementation manners, the message type indication is located in the target field of the first message, and/or the message type indication is that the first message is encapsulated by the multicast tunnel. The multicast address carried.

In some possible implementation manners, the first message is a VXLAN message including a VXLAN header of a virtual extensible local area network, and the target field is specifically a reserved field in the VXLAN header.

In some possible implementation manners, the processor 601 may also execute the following steps according to the computer program or instruction:

When it is determined according to the message type indication that the first message is the BUM message, and the first device is not the DF of the target device, the second message is not sent to the target device.

It should be noted that the processor in this application may include, but is not limited to, at least one of the following: central processing unit (CPU), microprocessor, digital signal processing (DSP), micro-controller Various computing devices that run software such as microcontroller units (MCUs) or artificial intelligence processors. Each computing device may include one or more cores for executing software instructions for calculations or processing. The processor can be a single semiconductor chip, or it can be integrated with other circuits to form a semiconductor chip. For example, it can be combined with other circuits (such as codec circuits, hardware acceleration circuits, or various bus and interface circuits) to form a system-on-chip ( system-on-a-chip), or as an application-specific integrated circuit (application-specific integrated circuit, ASIC) built-in processor integrated in the ASIC, the ASIC integrated with the processor can be packaged separately or can be Packaged with other circuits. In addition to the core used to execute software instructions for calculation or processing, the processor may further include necessary hardware accelerators, such as field programmable gate array (FPGA) and programmable logic device (programmable logic device). device, PLD), or a logic circuit that implements dedicated logic operations.

The memory in the embodiments of the present application may include at least one of the following types: read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory , RAM) or other types of dynamic storage devices that can store information and instructions, and may also be electrically erasable programmable-only memory (EEPROM). In some scenarios, the memory can also be a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage media, magnetic disk storage media, or other magnetic storage devices, or can be used to carry or store Any other medium that has desired program codes in the form of instructions or data structures and can be accessed by a computer, but is not limited to this.

The memory can exist independently and connected to the processor. Wherein, the memory can store program codes for executing the technical solutions of the embodiments of the present application, and the processor controls the execution, and various types of computer program codes that are executed can also be regarded as driver programs of the processor. For example, the processor is used to execute the computer program code stored in the memory, so as to implement the technical solutions in the embodiments of the present application.

In addition, an embodiment of the present application also provides a message transmission device. The device 700 can be applied to the first device in the foregoing method embodiment. The device 700 can specifically include a receiving module 701, a processing module 702, and a sending module 703:

The receiving module 701 is configured to receive a first message from a second device, where the first message includes a message type indication, and the message type indication is used to indicate that the first message is a unicast message or a broadcast message. Unknown unicast multicast BUM message;

The processing module 702 is configured to: when it is determined that the first packet is the unicast packet according to the packet type indication, or when it is determined that the first packet is the BUM according to the packet type indication When the first device is the designated forwarder DF of the destination device, the second packet is sent to the destination device through the sending module 703;

In some possible implementation manners, the processing module 702 is further configured to: when the first device determines that the first packet is the BUM packet according to the packet type indication, and the first device is not When the DF of the destination device is described, it is determined not to send the second message to the destination device.

It should be noted that the information interaction and execution process between the modules of the above-mentioned device are based on the same concept as the method embodiment in the embodiment of this application, and the technical effect brought by it is the same as that of the method embodiment in the embodiment of this application. For specific content, refer to the description in the foregoing method embodiment shown in the embodiment of the present application, which is not repeated here.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working processes of the above described devices, modules and units can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In this application, "of", corresponding "(English: corresponding, relevant)" and "corresponding (English: corresponding)" can sometimes be used together. It should be pointed out that when the difference is not emphasized, what it wants The meaning of the expression is consistent.

It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used as examples, illustrations, or illustrations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as "exemplary" or "for example" are used to present related concepts in a specific manner.

In this application, "at least one" refers to one or more. "Multiple" means two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple . In addition, in order to facilitate a clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with substantially the same function and effect. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and order of execution, and words such as "first" and "second" do not limit the difference.

The system architecture and business scenarios described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. Those of ordinary skill in the art will know that with the network With the evolution of architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.

In the several embodiments provided in this application, it should be understood that the disclosed devices, equipment, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the embodiments are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

A message transmission method, characterized in that the method includes:

The first device receives a first message from the second device, the first message includes a message type indication, and the message type indication is used to indicate that the first message is a unicast message or broadcast unknown unicast Multicast BUM messages;

When the first device determines that the first message is the unicast message according to the message type indication, or when the first device determines the first message according to the message type indication When it is the BUM message and the first device is the designated forwarder DF of the destination device, the first device sends a second message to the destination device;

Wherein, the second message is a message obtained after the first device decapsulates the first message, and the destination device is multi-homed to multiple network devices, and the multiple network devices The first device is included in.
The method according to claim 1, wherein the message type indicates a target field in the first message, and/or the message type indicates that the first message passes through a group The multicast address carried after the tunnel is encapsulated.
The method according to claim 2, wherein the first message is a VXLAN message including a VXLAN header of a virtual extensible local area network, and the target field is specifically a reserved field in the VXLAN header.
The method according to any one of claims 1 to 3, wherein the method further comprises:

When the first device determines that the first packet is the BUM packet according to the packet type indication, and the first device is not the DF of the destination device, the first device does not send The destination device sends a second message.
A message transmission device, characterized in that the device is applied to a first device, and the device includes a receiving module, a processing module, and a sending module:

The receiving module is configured to receive a first message from a second device, where the first message includes a message type indication, and the message type indication is used to indicate that the first message is a unicast message or Broadcast unknown unicast multicast BUM messages;

The processing module is configured to: when it is determined that the first message is the unicast message according to the message type indication, or when it is determined that the first message is the unicast message according to the message type indication BUM message, and when the first device is the designated forwarder DF of the destination device, send the second message to the destination device through the sending module;

Wherein, the second message is a message obtained after the first device decapsulates the first message, and the destination device is multi-homed to multiple network devices, and the multiple network devices The first device is included in.
The apparatus according to claim 5, wherein the message type indication is a target field in the first message, and/or the message type indication is that the first message passes through a group The multicast address carried after the tunnel is encapsulated.
The apparatus according to claim 6, wherein the first message is a VXLAN message including a VXLAN header of a virtual extensible local area network, and the target field is specifically a reserved field in the VXLAN header.
The device according to any one of claims 5 to 7, wherein the device further comprises:

The processing module is further configured to: when it is determined that the first message is the BUM message according to the message type indication, and the first device is not the DF of the destination device, determine not to send The destination device sends the second message.
A computer device characterized by comprising a processor and a memory;

The memory is used to store computer programs or instructions;

The processor is configured to execute the computer program or instruction, so that the computer device executes the message transmission method according to any one of claims 1 to 4.
A storage medium comprising instructions, which when run on a computer, cause the computer to execute the message transmission method according to any one of claims 1 to 4.