CN111770035A - MAC address table updating method and device, message sending method and electronic equipment - Google Patents

MAC address table updating method and device, message sending method and electronic equipment Download PDF

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Publication number
CN111770035A
CN111770035A CN202010614395.XA CN202010614395A CN111770035A CN 111770035 A CN111770035 A CN 111770035A CN 202010614395 A CN202010614395 A CN 202010614395A CN 111770035 A CN111770035 A CN 111770035A
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mac address
vtep
switch
arp request
gratuitous arp
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CN111770035B (en
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张余
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/25—Routing or path finding in a switch fabric
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing
    • H04L45/745—Address table lookup; Address filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5053—Lease time; Renewal aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/618—Details of network addresses
    • H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

The invention provides a method for updating an MAC address table of a switch, which is applied to a first VTEP and comprises the following steps: receiving a migration message sent by a second VTEP, wherein the migration message comprises an MAC address of a first VM, and the first VM is a VM migrated from the first VTEP to the second VTEP; determining an entry corresponding to the MAC address of the first VM in a MAC address table of the first VTEP according to the MAC address of the first VM; and sending a gratuitous ARP request to the switch through the entrance, wherein the source MAC address in the gratuitous ARP request is the MAC address of the first VM. Correspondingly, an MAC address table updating device of the switch, a message sending method and electronic equipment are also provided. The method can solve the problems of message forwarding error and service flow interruption caused by the fact that the switch cannot sense the migration of the virtual machine.

Description

MAC address table updating method and device, message sending method and electronic equipment
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for updating an MAC address table of a switch, a method for sending a packet, and an electronic device.
Background
Virtual Machine migration is a commonly used technique in EVPN (Ethernet Virtual Private Network), and refers to migrating a VM (Virtual Machine) from a VXLAN Tunnel Endpoint (VTEP) or a switching device to which the VM accesses, to another VTEP or a switching device in a data center Network, thereby improving the reliability of the Virtual Machine.
If VM1 is connected to VTEP1 through a switch, when VM1 migrates from VTEP1 to VTEP2, after VM1 migrates, the forwarding table on VTEP1 may be updated according to the received migration packet from VTEP2, that is, the egress Port in the forwarding table on VTEP1 for performing communication interaction with VM1 is updated to Tunnel by Port. However, the switch connected before VM1 migrates cannot sense that VM1 has migrated, and the egress port in the forwarding table of the switch for communication interaction with VM1 is still the original port. Therefore, when the traffic forwarded to the VM1 by the VM2 under the switch passes through the switch, the traffic is still forwarded through the original port, which causes a message forwarding error and service traffic interruption.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and an apparatus for updating an MAC address table of a switch, a method for sending a packet, and an electronic device, so as to solve the problems of packet forwarding error and service traffic interruption caused by the switch being unable to sense the migration of a virtual machine.
In a first aspect, an embodiment of the present invention provides a method for updating a MAC address table of a switch, which is applied to a first VTEP, and includes: receiving a migration message sent by a second VTEP, wherein the migration message comprises an MAC address of a first VM, and the first VM is a VM migrated from the first VTEP to the second VTEP; determining an entry corresponding to the MAC address of the first VM in a MAC address table of the first VTEP according to the MAC address of the first VM; and sending a gratuitous ARP request to the switch through the inlet so that the switch updates an output port corresponding to the MAC address of the first VM in the MAC address table of the switch to an interface for receiving the gratuitous ARP request, wherein a source MAC address in the gratuitous ARP request is the MAC address of the first VM, and a target MAC address in the gratuitous ARP request is a broadcast address.
Preferably, after sending the gratuitous ARP request to the switch through the ingress, the method further comprises: and updating the next hop corresponding to the MAC address of the first VM in the MAC address table of the first VTEP into a second VTEP.
In a second aspect, an embodiment of the present invention provides a method for updating a MAC address table of a switch, where the method is applied to the switch and includes: receiving a gratuitous ARP request sent by a first VTEP, wherein a source MAC address in the gratuitous ARP request is an MAC address of a first VM, a target MAC address is a broadcast address, and the first VM is a VM migrated from the first VTEP to a second VTEP; and updating an output port corresponding to the MAC address of the first VM in the MAC address table of the switch into an interface receiving the gratuitous ARP request according to the source MAC address in the gratuitous ARP request.
In a third aspect, an embodiment of the present invention provides a packet sending method, applied to an exchange, including: executing the MAC address table updating method of the switch described in the second aspect; receiving a data packet sent by a second VM of a lower link to a first VM; and sending the data packet to the first VTEP through the updated exit port corresponding to the MAC address of the first VM in the MAC address table of the switch.
In a fourth aspect, an embodiment of the present invention provides an apparatus for updating a MAC address table of a switch, which is applied to a first VTEP, and includes: the first receiving module is used for receiving a migration message sent by a second VTEP, wherein the migration message comprises an MAC address of a first VM, and the first VM is a VM migrated from the first VTEP to the second VTEP; the first sending module is connected with the first receiving module and used for determining an entry corresponding to the MAC address of the first VM in the MAC address table of the first VTEP according to the MAC address of the first VM; and sending a gratuitous ARP request to the switch through the entrance so as to enable the switch to update an exit port corresponding to the MAC address of the first VM in the MAC address table of the switch to be an interface for receiving the gratuitous ARP request, wherein a source MAC address in the gratuitous ARP request is the MAC address of the first VM, and a target MAC address in the gratuitous ARP request is a broadcast address.
Preferably, the apparatus further includes a first updating module, connected to the first receiving module, for updating a next hop corresponding to the MAC address of the first VM in the MAC address table of the first VTEP to be the second VTEP.
In a fifth aspect, an embodiment of the present invention provides an apparatus for updating a MAC address table of a switch, where the apparatus is applied to the switch, and includes: the second receiving module is used for receiving a gratuitous ARP request sent by the first VTEP, wherein a source MAC address in the gratuitous ARP request is a MAC address of the first VM, a destination MAC address is a broadcast address, and the first VM is a VM migrated from the first VTEP to the second VTEP; and the second updating module is connected with the second receiving module and used for updating the output port corresponding to the MAC address of the first VM in the MAC address table of the switch into an interface for receiving the gratuitous ARP request according to the source MAC address in the gratuitous ARP request.
In a sixth aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, where the memory stores a computer program, and the processor is configured to execute the computer program to implement the MAC address table updating method for the switch in the first aspect.
According to the method, the device, the message sending method and the electronic equipment for updating the MAC address table of the switch, the first VTEP sends the gratuitous ARP request to the inlet corresponding to the MAC address of the migrated first VM, the source MAC address of the gratuitous ARP request is the MAC address of the first VM, so that the switch at the inlet can update the outlet port corresponding to the MAC address of the first VM in the MAC address table of the switch as the interface for receiving the gratuitous ARP request according to the received gratuitous ARP request, and therefore the flow which is subsequently forwarded to the first VM is forwarded through the updated outlet port when passing through the switch, and the problems of message forwarding error and service flow interruption caused by the fact that the switch cannot sense the migration of the virtual machine are solved.
Drawings
FIG. 1: the invention is a flow chart of the method for updating the MAC address table of the switch;
FIG. 2: the invention is a flow chart of a MAC address table updating method of another exchanger of the embodiment;
FIG. 3: the structure diagram of the MAC address table updating device of the switch is provided in the embodiment of the invention;
FIG. 4: the structure diagram of the MAC address table updating device of another exchanger of the embodiment of the invention;
FIG. 5: which is a structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes in detail a MAC address table updating method, apparatus, message sending method and electronic device of the switch according to the present invention with reference to the accompanying drawings and embodiments.
Example 1:
and the first VM is uploaded to the first VTEP through the switch before migration, and the first VM is uploaded to the second VTEP after migration. After the first VM is migrated to the second VTEP, the embodiment provides a method for updating a MAC address table of a switch, which is applied to the first VTEP, and as shown in fig. 1, the method includes:
step 101, receiving a migration message sent by a second VTEP, where the migration message includes an MAC address of a first VM, and the first VM is a VM migrated from the first VTEP to the second VTEP.
In this embodiment, after the first VM migrates to the second VTEP, the second VTEP sends migration packets to all the VTEPs at the remote end, where the migration packets include the MAC address of the first VM.
And step 102, determining an entry corresponding to the MAC address of the first VM in the MAC address table of the first VTEP according to the MAC address of the first VM.
In this embodiment, after receiving a migration packet sent by a second VTEP, a first VTEP matches a MAC address of a first VM in the migration packet with all MAC addresses in a MAC address table stored by the first VTEP, and if the same MAC address is matched and an entry corresponding to the MAC address is a local port, the first VTEP determines that the first VM has been migrated to the second VTEP. Wherein, the MAC address table stored by the first VTEP comprises the corresponding relation between the MAC address and the entry. The first VTEP determines an entry corresponding to the MAC address of the first VM.
Step 103, sending a gratuitous ARP request to the switch through the determined entry, so that the switch updates an egress port corresponding to the MAC address of the first VM in the MAC address table of the switch to an interface for receiving the gratuitous ARP request, wherein a source MAC address in the gratuitous ARP request is the MAC address of the first VM, and a destination MAC address in the gratuitous ARP request is a broadcast address.
In this embodiment, the first VTEP sends a free APR request to the entry determined in step 102, where the free APR request includes a source MAC address and a destination MAC address, where the source MAC address is set as a MAC address of the first VM, and the destination address is a broadcast address, so that an exchange of the entry updates an egress port corresponding to the MAC address of the first VM in a MAC address table stored in the exchange to an interface that receives the free APR request according to the source MAC address in the free ARP request. The MAC address table stored by the switch comprises the corresponding relation between the MAC address and the output port. In the embodiment, only the source address of the free ARP request is modified, so that the cost is low and the implementation is easy.
Optionally, after sending the gratuitous ARP request to the switch through the ingress, the method further comprises: and updating the next hop corresponding to the MAC address of the first VM in the MAC address table of the first VTEP into a second VTEP.
In this embodiment, the MAC address table stored in the first VTEP includes a MAC address, an entry, a next hop, and a correspondence relationship between the MAC address, the entry, the next hop, and the three, and since the first VM is linked to the first VTEP before the migration, the entry and the next hop corresponding to the MAC address of the first VM in the MAC address table of the first VTEP are the same. The purpose of the first VTEP updating the next hop corresponding to the MAC address of the first VM in the MAC address table stored in the first VTEP to the second VTEP is to select the next hop to be the second VTEP for packet transmission when processing a packet transmitted to the first VM.
In the method for updating the MAC address table of the switch provided in this embodiment, the first VTEP connected in the upper part before the first VM migrates sends a free APR request to an entry corresponding to the MAC address of the first VM in the MAC address table stored in the first VTEP, and a source address of the free APR request is set as the MAC address of the first VM, so that the switch receiving the free APR request can update an egress port corresponding to the MAC address of the first VM in the MAC address table stored in the switch to an interface receiving the free APR request according to the MAC address of the first VM, so that when processing a packet sent to the first VM, the switch can send the packet to the first VTEP through the updated egress port, and then send the packet to the second VTEP by the first VTEP, and the second VTEP sends the packet to the first VM connected in the lower part. Therefore, message forwarding errors and service flow interruption caused by the fact that the switch cannot sense the migration of the virtual machine are avoided. And only the source address of the free ARP request is transformed into the MAC address of the first VM without transforming the switch, so that the cost is low and the implementation is easy.
Example 2:
and the first VM is uploaded to the first VTEP through the switch before migration, and the first VM is uploaded to the second VTEP after migration. As shown in fig. 2, this embodiment provides a method for updating a MAC address table of a switch, which is applied to the switch, and the method includes:
step 201, receiving a gratuitous ARP request sent by a first VTEP, where a source MAC address in the gratuitous ARP request is a MAC address of a first VM, a destination MAC address is a broadcast address, and the first VM is a VM migrated from the first VTEP to a second VTEP.
Step 202, according to the source MAC address in the gratuitous ARP request, updating the egress port corresponding to the MAC address of the first VM in the MAC address table of the switch as the interface that receives the gratuitous ARP request.
In this embodiment, the switch receives a free APR request sent by the first VTEP, and updates an egress port corresponding to the MAC address of the first VM in a MAC address table of the switch as an interface that receives the free APR request according to a source MAC address (i.e., the MAC address of the first VM) in the free APR request. When the switch processes the data packet sent to the first VM in future, the switch forwards the data packet through the updated egress port, that is, the switch forwards the data packet sent to the first VM to the first VTEP through the updated egress port, and then the first VTEP sends the data packet to the second VTEP, and the second VTEP sends the data packet to the first VM connected downstream. Thereby avoiding message forwarding error and service flow interruption.
Example 3:
and the first VM and the second VM are connected to the first VTEP through the switch before the first VM is migrated, and connected to the second VTEP after the first VM is migrated. The embodiment provides a message sending method, which is applied to a switch, and the method comprises the following steps:
executing the MAC address table updating method of the switch in embodiment 2;
receiving a data packet sent by a second VM of a lower link to a first VM;
and sending the data packet to the first VTEP through the updated exit port corresponding to the MAC address of the first VM in the MAC address table of the switch.
Example 4:
the embodiment provides a MAC address table updating apparatus of a switch, which is applied to a first VTEP, and as shown in fig. 3, the apparatus includes:
the first receiving module 41 is configured to receive a migration packet sent by the second VTEP, where the migration packet includes a MAC address of a first VM, and the first VM is a VM migrated from the first VTEP to the second VTEP.
A first sending module 42, connected to the first receiving module 41, configured to determine, according to the MAC address of the first VM, an entry in the MAC address table of the first VTEP, which corresponds to the MAC address of the first VM; and sending a gratuitous ARP request to the switch through the entrance, wherein a source MAC address in the gratuitous ARP request is the MAC address of the first VM, and a target MAC address is a broadcast address. So that the switch updates the output port corresponding to the MAC address of the first VM in the MAC address table stored by the switch as the interface for receiving the gratuitous ARP request.
Optionally, the apparatus further comprises a first update module.
The first updating module is connected to the first receiving module 41 and the first sending module 42, and configured to update a next hop corresponding to the MAC address of the first VM in the MAC address table of the first VTEP to the second VTEP after the first sending module 42 sends the free APR request.
Example 5:
this embodiment provides an apparatus for updating MAC address table of a switch, which is applied to the switch, and as shown in fig. 4, the apparatus includes:
the second receiving module 51 is configured to receive a gratuitous ARP request sent by a first VTEP, where a source MAC address in the gratuitous ARP request is a MAC address of a first VM, a destination MAC address is a broadcast address, and the first VM is a VM migrated from the first VTEP to a second VTEP.
And a second updating module 52, connected to the second receiving module 51, for updating an egress port corresponding to the MAC address of the first VM in the MAC address table of the switch to an interface that receives the gratuitous ARP request according to the source MAC address in the gratuitous ARP request.
Example 6:
as shown in fig. 5, the present embodiment provides an electronic device, which includes a memory 61 and a processor 62, where the memory 61 stores therein a computer program, and the processor 62 is configured to execute the computer program to implement the MAC address table updating method applied to the switch of the first VTEP described in embodiment 1.
The memory 61 is connected to the processor 62, the memory 61 may be a flash memory, a read-only memory or other memories, and the processor 62 may be a central processing unit or a single chip microcomputer.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (8)

1. A MAC address table updating method of a switch is applied to a first VTEP and is characterized by comprising the following steps:
receiving a migration message sent by a second VTEP, wherein the migration message comprises an MAC address of a first VM, and the first VM is a VM migrated from the first VTEP to the second VTEP;
determining an entry corresponding to the MAC address of the first VM in a MAC address table of the first VTEP according to the MAC address of the first VM;
and sending a gratuitous ARP request to the switch through the inlet so that the switch updates an output port corresponding to the MAC address of the first VM in the MAC address table of the switch to an interface for receiving the gratuitous ARP request, wherein a source MAC address in the gratuitous ARP request is the MAC address of the first VM, and a target MAC address in the gratuitous ARP request is a broadcast address.
2. The MAC address table updating method of a switch according to claim 1, wherein after sending the gratuitous ARP request to the switch through the ingress, the method further comprises:
and updating the next hop corresponding to the MAC address of the first VM in the MAC address table of the first VTEP into a second VTEP.
3. A method for updating MAC address table of switch is applied to switch, and is characterized by comprising:
receiving a gratuitous ARP request sent by a first VTEP, wherein a source MAC address in the gratuitous ARP request is an MAC address of a first VM, a target MAC address is a broadcast address, and the first VM is a VM migrated from the first VTEP to a second VTEP;
and updating an output port corresponding to the MAC address of the first VM in the MAC address table of the switch into an interface receiving the gratuitous ARP request according to the source MAC address in the gratuitous ARP request.
4. A message sending method is applied to a switch and is characterized by comprising the following steps:
performing the MAC address table updating method of the switch of claim 3;
receiving a data packet sent by a second VM of a lower link to a first VM;
and sending the data packet to the first VTEP through the updated exit port corresponding to the MAC address of the first VM in the MAC address table of the switch.
5. An apparatus for updating a MAC address table of a switch, applied to a first VTEP, comprising:
the first receiving module is used for receiving a migration message sent by a second VTEP, wherein the migration message comprises an MAC address of a first VM, and the first VM is a VM migrated from the first VTEP to the second VTEP;
the first sending module is connected with the first receiving module and used for determining an entry corresponding to the MAC address of the first VM in the MAC address table of the first VTEP according to the MAC address of the first VM; and sending a gratuitous ARP request to the switch through the entrance so as to enable the switch to update an exit port corresponding to the MAC address of the first VM in the MAC address table of the switch to be an interface for receiving the gratuitous ARP request, wherein a source MAC address in the gratuitous ARP request is the MAC address of the first VM, and a target MAC address in the gratuitous ARP request is a broadcast address.
6. The MAC address table updating apparatus of a switch according to claim 5, further comprising a first updating module,
and the first updating module is connected with the first receiving module and used for updating the next hop corresponding to the MAC address of the first VM in the MAC address table of the first VTEP into the second VTEP.
7. An apparatus for updating a MAC address table of a switch, applied to the switch, comprising:
the second receiving module is used for receiving a gratuitous ARP request sent by the first VTEP, wherein a source MAC address in the gratuitous ARP request is a MAC address of the first VM, a destination MAC address is a broadcast address, and the first VM is a VM migrated from the first VTEP to the second VTEP;
and the second updating module is connected with the second receiving module and used for updating the output port corresponding to the MAC address of the first VM in the MAC address table of the switch into an interface for receiving the gratuitous ARP request according to the source MAC address in the gratuitous ARP request.
8. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to implement the method according to any of claims 1-2.
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CN113037883A (en) * 2021-02-23 2021-06-25 中国联合网络通信集团有限公司 Method and device for updating MAC address table entries
CN113590268A (en) * 2021-08-06 2021-11-02 中国联合网络通信集团有限公司 Virtual machine migration method, ARP proxy gateway and VTEP
CN113612782A (en) * 2021-08-06 2021-11-05 中国联合网络通信集团有限公司 Virtual machine migration verification method and device
CN113703921A (en) * 2021-08-30 2021-11-26 中国联合网络通信集团有限公司 Virtual machine migration method and device and switch

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Publication number Priority date Publication date Assignee Title
CN113037883A (en) * 2021-02-23 2021-06-25 中国联合网络通信集团有限公司 Method and device for updating MAC address table entries
CN113590268A (en) * 2021-08-06 2021-11-02 中国联合网络通信集团有限公司 Virtual machine migration method, ARP proxy gateway and VTEP
CN113612782A (en) * 2021-08-06 2021-11-05 中国联合网络通信集团有限公司 Virtual machine migration verification method and device
CN113612782B (en) * 2021-08-06 2023-02-17 中国联合网络通信集团有限公司 Virtual machine migration verification method and device
CN113590268B (en) * 2021-08-06 2023-11-24 中国联合网络通信集团有限公司 Virtual machine migration method, ARP proxy gateway and VTEP
CN113703921A (en) * 2021-08-30 2021-11-26 中国联合网络通信集团有限公司 Virtual machine migration method and device and switch

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