WO2015100637A1

WO2015100637A1 - Method and switching device for link alternation

Info

Publication number: WO2015100637A1
Application number: PCT/CN2013/091166
Authority: WO
Inventors: 卢胜文
Original assignee: 华为技术有限公司
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2015-07-09
Also published as: CN103891204B; CN103891204A

Abstract

Provided in embodiments of the present invention are a method and switching device for link alternation, for solving the problem in the prior art of data loss due to downlink port failure. The method and switching device for link alternation of the embodiments of the present invention, by generating a second packet having a reverse address, where the source address of the second packet is the destination address of the first packet, and the destination address of the second packet is the source address of the first packet, and by transmitting the reverse address packet to a backup switching device that serves with the switching device as mutual backups, where the second packet is transmitted from a first interface of the backup switching device, allow a device transmitting the first packet to acquire in a timely manner an address of the backup switching device and to transmit data from the backup switching device, thus preventing the device transmitting the first packet from being unable to learn in a timely manner the problem of data loss as a result of a fault in a second interface of the switching device.

Description

TECHNICAL FIELD The present invention relates to the field of information technologies, and in particular, to a link switching method and a switching device. BACKGROUND In network communication, in order to ensure normal communication, two links are usually used to back up each other, and when one link is interrupted, it switches to another link. For example, the server is connected to the switch. Usually, the server is connected to the switch through a dual-interface NIC. If a link connected to the switch is disconnected, the server can detect the link interruption, and subsequent packets sent to the interrupted link are redirected to the normal chain. Road, this can achieve uninterrupted network links.

The above simple dual link method does not completely solve the network reliability problem. The upstream device can only know the fault of the direct link, and it does not know that the port is not directly connected. For example, if the uplink port of the switch is faulty, the server does not know, and the packet is sent to the switch, causing the packet to be discarded on the switch. .

Moni tor l ink is a commonly used technology for implementing switching. It does not need to exchange any protocol with the connected network device, and does not need to cooperate with the peer device. It can easily realize fault switching and realize simple cost. The ideal data flow fault switching technology.

In Moni tor l ink, the network device is connected to the upper-level network device through the uplink port and connected through the downlink port server. When the uplink link is faulty, the moni tor l ink detects that the uplink port is interrupted, and then all the corresponding downlink ports are down, so that the device connected to the downlink port (for example, the server) can detect that the link of the corresponding connection is down. Therefore, the packet is not sent to the link to send data, but only the packet is sent to the normal link, so that the packet is sent to the failed switch and the packet is lost. However, the prior art cannot solve the scenario in which the downlink port is faulty. The text will continue to come in from the uplink port, but it cannot be sent out from the downlink port. As a result, a large number of packets are lost. Only after the server actively initiates the packet, the device that initiates the data learns the new MAC (Medical ia Acces s Cont ro l , media access control) address, will send data from the normal switching device. If the server does not send data to the outside, the data sent from the failed switching device will be discarded, resulting in data loss.

Summary of the invention

The embodiment of the present invention provides a link switching method and a switching device to solve the problem of data data loss caused by a downlink port failure in the prior art. The embodiment of the present invention provides a switching device, where the switching device includes: a packet receiving module, a port monitoring module, a fault packet processing module, and an intermediate port packet forwarding module; and the packet receiving module is configured to receive a first packet sent by the first port of the switching device to the switching device; the port detecting module, configured to detect a second port state of the switching device, where the second port of the switching device is detected The fault message processing module is configured to notify the fault packet processing module, and the fault packet processing module is configured to generate a second packet with a reverse address according to the notification of the port detecting module, and report the reverse address The message is sent to the intermediate port packet forwarding module; the source address of the second packet is the destination address of the first packet, and the destination address of the second packet is the source address of the first packet; The intermediate port packet forwarding module is configured to send the second packet sent by the fault packet processing module to a backup switching device that is backed up with the switching device, so that The second interface sends the first packet switching device from the backup.

Optionally, the fault packet processing module generates the second packet with the reverse address, where the fault packet processing module changes the source media access control MAC address of the first packet. For the destination MAC address, change the destination MAC address of the first packet to the source MAC address to generate a second packet.

Optionally, the fault packet processing module generates the second packet with the reverse address, where the fault packet processing module generates the second packet according to the Internet Protocol IP address of the first packet, where The source MAC address of the second packet is the destination MAC address of the first packet, and the destination MAC address of the second packet is the source MAC address of the first packet.

Optionally, the generating, by the faulty packet processing module, the second packet that has the reverse address, the faulty packet processing module generates the second packet according to the preset fixed IP address, where the second packet is generated. The source MAC address of the text is the destination MAC address of the first packet, and the destination MAC address of the second packet is the source MAC address of the first packet. Optionally, the second packet has an identifier that is different from the first packet, so that the backup switching device can identify that the second packet is to be sent through the first port according to the identifier.

Optionally, the switching device is a switching device that supports the moni tor ink technology, where the first port of the switching device is an uplink port of the switching device and other network devices, and the second port of the switching device It is the downlink port to which the switching device is connected to the server. Optionally, the switching device further includes a forwarding module, where the forwarding module is configured to send the first packet to the intermediate port packet forwarding module; correspondingly, the intermediate port packet forwarding module is further used. Receiving the first packet sent by the forwarding module, and sending the first packet to the backup switching device, so that the first packet is sent from a second port of the backup switching device. . The embodiment of the present invention further provides a method for link switching, where the method includes: receiving a first packet sent to the switching device by using a first port of the switching device; and detecting a second port state of the switching device Generating a second packet with a reverse address when the second port of the switching device is detected to be faulty, where the source address of the second packet is the The destination address of the first packet, the destination address of the second packet is the source address of the first packet, and the second packet is sent to the backup switching device that is backed up with the switching device. The second packet is sent from the first interface of the backup switching device.

Optionally, the generating the second packet with the reverse address includes: changing the source media access control MAC address of the first packet to the destination MAC address, and changing the destination MAC address of the first packet to Source MAC address to generate a second packet.

Optionally, the generating the second packet with the reverse address includes:

And generating a second packet according to the Internet Protocol IP address of the first packet, where a source MAC address of the second packet is a destination MAC address of the first packet, and a destination MAC address of the second packet It is the source MAC address of the first packet.

Optionally, the generating the second packet with the reverse address includes: generating a second packet according to the preset fixed IP address, where the source MAC address of the second packet is the purpose of the first text The MAC address, the destination MAC address of the second message is the source MAC address of the first source. Optionally, the second packet has an identifier that is different from the first packet, so that the backup switching device can identify that the second packet is to be sent through the first port according to the identifier.

Optionally, the switching device is a switching device that supports the moni tor ink technology, where the first port of the switching device is an uplink port of the switching device and other network devices, and the second port of the switching device It is the downlink port to which the switching device is connected to the server. Optionally, the method further includes: sending the first packet to the backup switching device, so that the first packet is sent from a second port of the backup switching device.

The method for the link switching and the switching device provided by the embodiment of the present invention, by generating a second packet with a reverse address, where the source address of the second packet is the destination address of the first packet, The destination address of the second packet is the source address of the first packet, and the reverse address packet is sent to the backup switching device that is backed up with the switching device, and the second packet is The first interface of the backup switching device sends, so that the device that sends the first packet obtains the address of the backup switching device in time, and sends data from the backup switching device, thereby avoiding the downlink port failure of the second port of the switching device. The device that sends the first packet cannot know the data loss caused in time. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and other drawings may be obtained from those skilled in the art without departing from the drawings.

1 is a schematic diagram of a basic structure of a moni tor 1 ink group in the prior art; FIG. 2 is a schematic structural diagram of a switching device 200 according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another implementation manner of a switching device 200 according to an embodiment of the present invention; FIG. 4 is a schematic flowchart of a method for link switching according to an embodiment of the present invention. The drawings illustrate the technical solutions in the embodiments of the present invention clearly and completely, and it is obvious that the described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1, FIG. 1 is a schematic diagram of a basic structure of a moni tor 1 ink group implemented in the prior art. The server 100 is connected to the switching device A and the switching device B respectively, the network device 101 is connected to the switching device A, and the communication with the server 100 is realized by the switching device A; the switching device B is used as the switching device on the alternate path of the network device 101, and is exchanged. When the device A fails to transmit data, the network device 101 can implement communication with the server 100 through the switching device B. The function of the moni tor l ink is configured on the switching device A and the switching device B. The uplink port A and the downlink port A belong to a moni tor l ink group, and the uplink port B and the downlink port B belong to a moni tor l ink. group. The interface between the network device 101 and the switching device A is the uplink port A, and the data sent by the network device 101 to the server 100 is sent to the switching device A through the uplink port A, and the switching device A transmits the data to the server 100 through the downlink port A of the server 100. . If the downlink port A is faulty, the server can detect the port fault and will not send packets from the downlink port A. However, the network device 101 connected to the uplink port A does not know that the downlink port A has failed, and continues to send data or packets from the uplink port A to the switching device. As the downlink port A is faulty, the packet cannot be sent from the downlink port A. Therefore, only data or packets can be discarded, resulting in a large loss of data or packets. Only the server actively sends data or packets to the network device 101 through the switching device B. The network device 101 sends the data to the uplink port of the switching device B according to the MAC address of the forwarding data or the packet (that is, the MAC address of the switching device B). Send data or messages. If the server 100 does not send data or messages to the network device 101, the data or messages sent by the network device to the server 100 will always be discarded. To solve the problem of data loss from the uplink port caused by the downlink port failure in the prior art, the embodiment of the present invention provides a switching device 200. Referring to FIG. 2, FIG. 2 is a schematic structural diagram of a switching device 200 according to an embodiment of the present invention. The switching device 200 includes: a packet receiving module 201, a port monitoring module 202, a fault packet processing module 203, and an intermediate port packet forwarding module. The packet receiving module 201 is configured to receive a first packet that is sent to the switching device 200 by using the first port of the switching device 200. The port detecting module 202 is configured to detect the switching device. 200 second port status, When the second port of the switching device 200 is detected to be faulty, the faulty packet processing module 203 is notified; the first port of the switching device 200 is a port of the switching device 200 connected to other network devices, for example It can be an uplink port connected to other network devices in the moni tor ink technology. The second port of the switching device 200 is a port that the switching device 200 is connected to the server, and may be, for example, a downlink port connected to the server in the moni tor ink technology. The port detection module 202 detects the state of the first port by checking the status word of the link periodically, and confirms whether the first port is faulty or the like according to the status word of the link. The embodiment of the present invention does not limit the manner of port state detection.

Optionally, when detecting that the second port of the switching device 200 is faulty, the port detecting module 202 turns off the second port of the switching device 200, and the data received by the switching device 200 from the first port or The message is no longer forwarded through the second port.

The fault packet processing module 203 is configured to generate a second packet with a reverse address according to the notification of the port detection module 202, and send the reverse address packet to the intermediate port packet forwarding module 204. The source address of the second packet is the destination address of the first packet, and the destination address of the second packet is the source address of the first packet;

The intermediate port packet forwarding module 204 is configured to send the second packet sent by the fault packet processing module 203 to a backup switching device that is backed up with the switching device 200, so that the The second packet is sent from the first interface of the backup switching device. The intermediate port packet forwarding module 204 sends the second packet to the network device that sends the first packet by using the first interface of the backup switching device, so that the network that sends the first packet is sent. The device can obtain the address of the new switching device, that is, the address of the backup switching device, and then send the subsequently sent packet to the backup switching device to implement instant link switching and ensure data security.

The switching device 200 generates a second packet with a reverse address by using the fault packet processing module 203, where the source address of the second packet is the destination address of the first packet, and the second packet The destination address of the text is the source address of the first packet, and the reverse address packet is sent to the backup switching device that is backed up with the switching device 200 by using the intermediate port packet forwarding module. The second packet is sent from the first interface of the backup switching device, so that the device that sends the first packet acquires the address of the backup switching device in time, and sends data from the backup switching device, thereby avoiding the second port of the switching device. The device that sends the first packet when the downlink port is faulty cannot know the data loss problem in time. The backup switching device that is backed up with the switching device 200 is a switching device that is connected to the same server in common with the switching device 200, and the link between the switching device 200 and the server. The link between the backup switching device and the server is a backup relationship; the switching device that supports the mutual backup of the Moni tor ink technology, for example, the switching device A and the switching device B in FIG. 1 are mutually backup and exchanged. Device B is the backup switching device of switching device A. When the link between the switching device 200 and the server fails, a link between the backup switching device and the server can be used to replace the link between the switching device 200 and the server. . As an optional implementation manner, the switching device 200 further includes a forwarding module 205. Referring to FIG. 3, FIG. 3 is a schematic structural diagram of another implementation manner of a switching device 200 according to an embodiment of the present invention. The forwarding module 205 is configured to send the first packet to the intermediate port packet forwarding module 204. Correspondingly, the intermediate port packet forwarding module 204 is further configured to receive the forwarding module 205. Transmitting the first packet, and sending the first packet to the backup switching device, so that the first packet is sent from a second port of the backup switching device.

The first packet is sent to the packet forwarding module 204 by the forwarding module 205, and the packet forwarding module 204 sends the first packet to the backup switching device, so that the first packet is sent from the backup. The second port of the switching device can further improve the security of the data, so that the first packet is prevented from being lost due to the failure of the second port of the switching device 200 to be sent out. The first port of the backup switching device is a port of the backup switching device connected to other network devices, and may be, for example, an uplink port connected to other network devices in the moni tor 1 ink technology. The second port of the backup switching device is a port that is connected to the server by the switching device 200, and may be, for example, a downlink port connected to the server in the mon i tor 1 i nk technology as an optional implementation manner, where the fault occurs. The message processing module 203 generates the second message having the reverse address, which may include: changing the source MAC address of the first text to the destination MAC address, and changing the destination MAC address of the first text to the source MAC address, to Generate the second ^艮 text. As an optional implementation manner, the generating, by the faulty packet processing module 203, the second packet having the reverse address may further include: generating, by using an IP (Internet Protocol) address of the first packet The second packet, for example, the second packet may be an ARP (Addres Resin Protocol) packet, and the source MAC address of the ARP packet is the destination MAC address of the first packet, and the ARP The destination MAC address of the packet is the source MAC address of the first packet. As an optional implementation manner, the generating, by the faulty packet processing module 203, the second packet having the reverse address may further include: generating a second packet according to the preset fixed IP address, where the second packet is sent The ARP packet may be an ARP packet, where the source MAC address of the ARP packet is the destination MAC address of the first packet, and the destination MAC address of the ARP packet is the source MAC address of the first packet. As an optional implementation, the fault packet processing module 203 generates a second packet having a reverse address, and has an identifier different from the first packet, so that the backup switching device is configured according to the identifier. The second message can be identified to be sent through the first port.

The implementation of the switching device 200 can avoid the problem of data loss from the uplink port caused by the downlink port failure in the scenario of implementing the Moni tor ink switching technology, and can be initiated before the network device such as the server initiates data transmission. In time, the data sent from the uplink port is switched to the alternate switching device transmission, which avoids data loss and improves data security.

Referring to FIG. 4, FIG. 4 is a schematic flowchart of a method for link switching according to an embodiment of the present invention. Figure, including:

Step 400: Receive a first packet sent to the switching device by using a first port of the switching device.

Step 402: Detect a second port status of the switching device, and when detecting that the second port of the switching device is faulty, generate a second packet with a reverse address, where the source address of the second packet is a destination address of the first packet, where the destination address of the second packet is a source address of the first packet; Step 404: Send the second packet to a backup device with the switching device Backing up the switching device, so that the second packet is sent from the first interface of the backup switching device. The second packet is sent to the network device that sends the first packet by using the first interface of the backup switching device, so that the network device that sends the first packet can obtain the address of the new switching device. That is, the address of the switching device is backed up, so that the subsequently sent packet is sent to the backup switching device to implement instant link switching and ensure data security. The method of the second packet generates a second packet, the source address of the second packet is the destination address of the first packet, and the destination address of the second packet is the first packet. The source address is sent to the backup switching device that is backed up with the switching device, and the second packet is sent from the first interface of the backup switching device, so that the sending The device of the first packet obtains the address of the backup switching device in time, and sends data from the backup switching device, so as to avoid the data loss caused by the device that sends the first packet due to the failure of the second port of the switching device.

The method for generating the second packet with the reverse address may include: changing the source media access control MAC address of the first packet to the destination MAC address, and changing the destination MAC address of the first packet. The source MAC address is used to generate a second packet.

As an optional implementation, generating the second packet with the reverse address may also pass The following ways are implemented:

Optionally, generating the second packet with the reverse address may also be implemented by: generating a second packet according to the preset fixed IP address, where the source MAC address of the second packet is the The destination MAC address of the text, and the destination MAC address of the second message is the source MAC address of the first source. The second packet has an identifier that is different from the first packet, so that the backup switching device can identify that the second packet is to be sent through the first port according to the identifier. The switching device in the link switching method of the embodiment of the present invention may be a switching device supporting the moni tor ink technology, where the first port of the switching device is an uplink port of the connection between the switching device and other network devices, The second port of the switching device is a downlink port to which the switching device is connected to the server. The method may further include: sending the first packet to the backup switching device, so that the first packet is sent from a second port of the backup switching device. The implementation manner of the foregoing method embodiments may be implemented by referring to the implementation manner of the embodiment of FIG. 2 or FIG. 3. The above method can be implemented in the above-mentioned switching device 200 in FIG. 2 or FIG. 3, and details are not described herein again. Sending the first packet to the backup switching device, so that the first packet is sent from the second port of the backup switching device, so that data security can be further improved, so that the first packet is avoided. The loss of the first packet caused by the failure of the second port of the switching device to be sent out.

One of ordinary skill in the art will recognize that the embodiments described herein are described in connection with the embodiments disclosed herein. The example units and algorithm steps can be implemented in electronic hardware, computer software, or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the examples have been generally described in terms of function in the above description. Composition and steps. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection. The components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on this understanding, The technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions. To enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a USB flash drive, a mobile hard disk, and a read only memory.

(ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention. Modifications or substitutions are intended to be included within the scope of the invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A switching device, the switching device includes: a message receiving module, a port monitoring module, a fault packet processing module, and an intermediate port packet forwarding module;

The packet receiving module is configured to receive a first packet sent by the first port of the switching device to the switching device;

The port detecting module is configured to detect a second port state of the switching device, and notify the fault packet processing module when detecting that the second port of the switching device is faulty;

The fault packet processing module is configured to generate a second packet with a reverse address according to the notification of the port detection module, and send the reverse address packet to the intermediate port packet forwarding module. The source address of the second packet is the destination address of the first packet, the destination address of the second packet is the source address of the first packet, and the intermediate port packet forwarding module is configured to The second packet sent by the faulty packet processing module is sent to the backup switching device that is backed up with the switching device, so that the second packet is sent from the first interface of the backup switching device.

The switching device according to claim 1, wherein the generating, by the faulty packet processing module, the second packet having the reverse address comprises:

The fault packet processing module changes the source media access control MAC address of the first packet to a destination MAC address, and changes the destination MAC address of the first packet to a source MAC address to generate a second packet.

The switching device according to claim 1, wherein the generating, by the faulty packet processing module, the second packet having the reverse address comprises: The fault packet processing module generates a second packet according to the Internet Protocol IP address of the first packet, where the source MAC address of the second packet is the destination MAC address of the first packet, The destination MAC address of the second packet is the source MAC address of the first packet.

The fault packet processing module generates a second packet according to a preset fixed IP address, where a source MAC address of the second packet is a destination MAC address of the first packet, and the second The destination MAC address of the text is the source MAC address of the first packet.

The switching device according to any one of claims 1 to 4, wherein the second packet has an identifier different from the first packet, so that the backup switching device can identify according to the identifier. The second message is sent through the first port.

The switching device according to any one of claims 1-4, wherein the switching device is a switching device supporting a moni tor ink technology, and the first port of the switching device is the switching device and other A connected uplink port of the network device, where the second port of the switching device is a downlink port to which the switching device is connected to the server.

The switching device according to any one of claims 1 to 4, wherein the switching device further includes a forwarding module, and the forwarding module is configured to send the first packet to the intermediate port packet. Correspondingly, the intermediate port packet forwarding module is further configured to receive the first packet sent by the forwarding module, and send the first packet to the backup switching device, so that the The first packet is sent from the second port of the backup switching device.

A method for link switching, the method comprising: receiving a first packet sent to the switching device by using a first port of a switching device; and detecting a second port state of the switching device, When the second port of the switching device is faulty, the second packet with the reverse address is generated, the source address of the second packet is the destination address of the first packet, and the second packet is The destination address of the text is the source address of the first packet, and the second packet is sent to the backup switching device that is backed up with the switching device, so that the second packet is sent from the backup switching device. The first interface is sent.

The switching device according to claim 8, wherein the generating the second packet with the reverse address comprises: changing the source media access control MAC address of the first packet to the destination MAC address The destination MAC address of the first packet is changed to the source MAC address to generate a second packet.

The method according to claim 8, wherein the generating the second message with the reverse address comprises:

The method according to claim 8, wherein the generating the second packet with the reverse address comprises: generating a second packet according to the preset fixed IP address, where the second packet is Source MAC address The destination MAC address of the first text, and the destination MAC address of the second text is a source MAC address of the first source.

The method according to any one of claims 8 to 11, wherein the second packet has an identifier different from the first packet, so that the backup switching device can identify the identifier according to the identifier. The second packet is to be sent through the first port.

The method according to any one of claims 8 to 11, wherein the switching device is a switching device supporting a moni tor ink technology, and the first port of the switching device is the switching device and other networks. A connected uplink port of the device, where the second port of the switching device is a downlink port to which the switching device is connected to the server.

The method according to any one of claims 8-11, wherein the method further comprises:

Sending the first packet to the backup switching device, so that the first packet is sent from a second port of the backup switching device.