CN103346900B - Method for configuring route after live migration of virtual machine and gateway in big double layer network - Google Patents

Abstract

The embodiment of the present invention provides a routing configuration method and a gateway after virtual machine hot migration in a large two-layer network. The method includes: the gateway obtains the address information of the VM moving into the first subnet and the address information of the CN communicating with the VM, wherein the VM is hot migrated from the second subnet to the first subnet; the gateway sends the CN address information to the CN according to the address information of the CN A channel establishment request message is sent, wherein the channel establishment request message is used to request to establish a channel between the gateway and the CN and to configure the channel on the route from the CN to the VM. In the embodiment of the present invention, the gateway obtains the address information of the VM that is hot migrated to the subnet where the gateway is located and the address information of the CN that communicates with the VM, and sends a channel establishment request message to the CN to establish a channel from the gateway to the CN and configure the channel The routing between CN and VM shortens the routing path between CN and VM, which can reduce the communication delay after VM live migration in a large layer 2 network to a certain extent.

Description

Routing configuration method and gateway after live migration of virtual machines in a large layer 2 network

technical field

Embodiments of the present invention relate to the field of computer networks, and more specifically, relate to a routing configuration method and a gateway after live migration of a virtual machine in a large two-layer network.

Background technique

Cloud computing and virtualization technology have made people put forward new requirements for the deployment and management of data centers, including multi-tenant (Multi-tenant) management, multiple virtual networks to achieve information isolation, and cross-data centers to realize virtual local area networks (Virtual LAN, VLAN) global deployment and so on.

Large Layer 2 network technology uses Internet Protocol (IP) tunneling technology to enable VLANs to communicate with each other, forming an overlay network (Overlay network) on top of an IP network.

However, after the virtual machine (Virtual Machine, VM) live migration (live migration), the peer node (Corresponding Node, CN) communicating with the VM does not know the migration action of the VM, and will still maintain the connection with the network before the VM migration , after the data sent from the peer node CN arrives at the source network, and then passes through the internal routing of the large layer 2 network, it arrives at the network after the migration of the VM, resulting in a large detour on the communication path, resulting in the communication between the VM and the CN The delay increases, and this phenomenon is called the traffic trombone phenomenon.

Contents of the invention

Embodiments of the present invention provide a routing configuration method and a gateway after virtual machine hot migration in a large layer 2 network, which can reduce communication delay after VM hot migration in a large layer 2 network to a certain extent.

In the first aspect, a routing configuration method after live migration of a virtual machine in a large layer 2 network is provided, the method includes: the gateway obtains the address information of the virtual machine VM moved into the first subnet and the peer end communicating with the VM Address information of the node CN, wherein the gateway is a gateway in the first subnet for exchanging data with an external network of the first subnet, and the VM is hot migrated from the second subnet to the first subnet; The gateway sends a channel establishment request message to the CN according to the address information of the CN, wherein the channel establishment request message is used to request the establishment of a channel between the gateway and the CN and configure the channel on the route from the CN to the VM , the channel is used to transmit data packets between the CN and the VM.

With reference to the first aspect, in a first possible implementation manner, the method further includes: the gateway receiving a channel establishment confirmation message sent by the CN according to the channel establishment request message; and the gateway configuring the channel in accordance with the channel establishment confirmation message The port of the gateway; the gateway configures the channel on the route from the VM to the CN.

In combination with the first aspect or the first possible implementation of the first aspect, in the second possible implementation, the gateway acquiring the address information of the virtual machine VM relocated to the first subnet includes specifically implementing: the gateway Obtain an address resolution protocol ARP request packet from the second subnet, broadcast and send the ARP request packet on the first subnet, the ARP request packet carries the IP address information of the VM; the gateway obtains the VM according to the ARP request The ARP response packet returned by the packet, the ARP response packet carries the MAC address information of the VM; the gateway obtains the address information of the VM according to the ARP request packet and the ARP response packet, and the address information of the VM includes the IP address of the VM and the MAC address of that VM.

In combination with the second possible implementation of the first aspect, in the third possible implementation, the gateway obtains the address information of the peer node CN communicating with the VM as follows: the gateway obtains the A data packet of the VM, the data packet carries the IP address information of the CN; the gateway obtains the address information of the CN according to the data packet, and the address information of the CN includes the IP address information of the CN.

Combining the first aspect or any possible implementation manner of the first possible implementation manner of the first aspect to the third possible implementation manner of the first aspect, in the fourth possible implementation manner, the specific implementation is as : The channel establishment request message carries the type of the channel, the IP address information and port information of the gateway.

In a second aspect, a gateway is provided, and the gateway includes: an acquisition unit, configured to acquire address information of a virtual machine VM migrated into the first subnet and address information of a peer node CN communicating with the VM, wherein the The gateway is a gateway in the first subnet for exchanging data with the external network of the first subnet, and the VM is hot migrated from the second subnet to the first subnet; the output unit is used to Information sends a channel establishment request message to the CN, wherein the channel establishment request message is used to request the establishment of a channel between the gateway and the CN and update the channel to the route from the CN to the VM, and the channel is used for transmission Packets between this CN and this VM.

With reference to the second aspect, in a first possible implementation manner, the gateway further includes: an input unit, configured to receive a channel establishment confirmation message sent by the CN according to the channel establishment request message; The confirmation message configures the channel on the port of the gateway; the configuration unit is also used to configure the channel on the route from the VM to the CN.

In combination with the second aspect or the first possible implementation of the second aspect, in the second possible implementation, when acquiring the address information of the virtual machine VM that migrated into the first subnet, the acquiring unit is specifically implemented as: Obtaining the address resolution protocol ARP request packet from the second subnet, and broadcasting the ARP request packet on the first subnet through the output unit, the ARP request packet carrying the IP address information of the VM; obtaining the VM according to the The ARP response packet returned by the ARP request packet, the ARP response packet carries the MAC address information of the VM; obtain the address information of the VM according to the ARP request packet and the ARP response packet, and the address information of the VM includes the IP address of the VM address and the MAC address of the VM; correspondingly, the output unit is also used to broadcast and send the ARP request packet on the first subnet.

In combination with the second possible implementation of the second aspect, in the third possible implementation, when obtaining the address information of the peer node CN communicating with the VM, the obtaining unit is specifically implemented as: obtaining The data packet of the VM, the data packet carries the IP address information of the CN; the address information of the CN is obtained according to the data packet, and the address information of the CN includes the IP address information of the CN.

Combining the second aspect or any possible implementation manner of the first possible implementation manner of the second aspect to the third possible implementation manner of the second aspect, in the fourth possible implementation manner, the specific implementation is as : The channel establishment request message carries the type of the channel, the IP address information and port information of the gateway.

Based on the above technical solutions, the routing configuration method and gateway after the live migration of virtual machines in a large layer 2 network obtain the address information of the VM that is live migrated to the subnet where the gateway is located and the address information of the CN that communicates with the VM, and send it to the CN The channel establishment request message is used to establish the channel from the gateway to the CN and configure the channel to the route between the CN and the VM, which shortens the routing path between the CN and the VM, and can reduce the communication after the live migration of the VM in the large layer 2 network to a certain extent Delay.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of an application scenario before virtual machine live migration according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an application scenario after virtual machine live migration according to an embodiment of the present invention.

FIG. 3 is a schematic flowchart of a routing configuration method after live migration of a virtual machine in a large Layer 2 network according to an embodiment of the present invention.

FIG. 4 is another schematic flowchart of a routing configuration method after live migration of a virtual machine in a large Layer 2 network according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of an application scenario in which a virtual machine in a large Layer 2 network requests channel establishment after hot migration according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of routing configuration effects after live migration of a virtual machine in a large Layer 2 network according to an embodiment of the present invention.

FIG. 7 is an interaction flowchart of a communication method after live migration of a virtual machine in a large Layer 2 network according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a gateway according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of another gateway according to an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In order to facilitate understanding of the embodiments of the present invention, several elements that will be introduced in the description of the embodiments of the present invention are firstly introduced here.

In order to facilitate the understanding of the embodiments of the present invention, here are several elements that will be introduced in the description of the embodiments of the present invention:

Virtual machine VM means that one or more virtual computers can be simulated on a physical computer through virtual machine software, and these virtual machines work like real computers, and operating systems and applications can be installed on virtual machines , the virtual machine can also access network resources. To the applications running in the virtual machine, the virtual machine looks like working on a real computer.

Large Layer 2 network technology refers to the technology that uses technologies such as tunnels to enable VLANs to cross the Internet Protocol (IP) network and realize Layer 2 network interconnection and intercommunication. In addition, the large layer-2 network technology mentioned in the present invention refers to the use of IP network interconnection technology to realize the layer-2 extended network technology across the layer-3 network, including but not limited to virtual extended local area network (Virtual eXtensibleLocal Area Network, VxLAN) technology, Generic Routing Encapsulation Network Virtualization (NetworkVirtualization using Generic Routing Encapsulation, NVGRE) technology, Overlay Transport Virtualization (Overlay Transport Virtualization, OTV), etc.

Live migration refers to the process of migrating a VM between different physical hosts. During the migration process, the VM is not powered off, and the Media Access Control (MAC) address and IP address of the VM remain unchanged after migration.

The traffic trombone phenomenon refers to the back and forth flow of information within the network. After VM hot migration in cloud computing environment, the CN that communicates with it will first send the data to the original VM network, and then route to the VM through the internal routing of the large layer 2 network, forming a large detour on the communication path, resulting in increased communication delays and other issues .

A gateway (Gateway, GW) is a "gateway" that connects one network to another network, also known as an Internet connector or a protocol converter. The gateway implements network interconnection on the transport layer and is the most complex network interconnection device, which is only used for the interconnection of two networks with different high-level protocols. Gateways can be used for both WAN interconnection and LAN interconnection. A gateway is a computer system or device that acts as a switch. A gateway is a translator between two systems that use different communication protocols, data formats or languages, or even completely different architectures. Unlike bridges, which simply convey information, gateways repackage received information to suit the needs of the destination system. At the same time, the gateway can also provide filtering and security functions.

FIG. 1 is a schematic diagram of an application scenario before virtual machine live migration according to an embodiment of the present invention. In FIG. 1 , a virtual machine (Virtual Machine, VM) 108 is in the second subnet, and communicates with a corresponding node (Corresponding Node, CN) 101 through a router 102 through a GW 103 . In FIG. 1 , router 102 is a general concept, referring to a router of a network. GW103 is a gateway in the second subnet for exchanging data with the external network of the second subnet. The external network of the second subnet may be the first subnet or the subnet where CN101 is located in FIG. 1 . VM 108 is ready to migrate from the second subnet to the first subnet. The second subnet here can be understood as a source subnet, and the first subnet can be understood as a target subnet.

FIG. 2 is a schematic diagram of an application scenario after virtual machine live migration according to an embodiment of the present invention. As shown in Figure 2, after VM108 is hot-migrated from the second subnet to the first subnet, the data packets sent by CN101 communicating with VM108 to the VM will still arrive at the second subnet first, and go through the internal ARP of the large layer-2 network. and the routing mechanism to reach the first subnet where the VM 108 is located. As shown in Figure 2, the data packet sent by CN101 can reach VM108 through router 102, GW103, second subnet VxLAN proxy node (VxLAN Tunnel EndPoint, VTEP) 104, router 105, VTEP106, and GW107. In FIG. 2 , router 102 and router 105 are a general concept, referring to routers on the network. GW103 is a gateway in the second subnet for exchanging data with the external network of the second subnet; GW107 is a gateway for exchanging data with the external network of the first subnet in the first subnet. The external network of the second subnet in FIG. 2 may be the first subnet or the subnet where CN101 is located. The external network of the first subnet in FIG. 2 may be the second subnet or the subnet where CN101 is located. After VM 108 migrates from the second subnet to the first subnet, the second subnet can establish a connection with VM 108 through the tunnel between VTEP 104 and VTEP 106 .

Of course, in the present invention, the scenarios shown in Fig. 1 and Fig. 2 are only schematic diagrams, which does not mean that the application scenarios of the embodiments of the present invention are limited to the network nodes shown in the figure, and the network nodes shown in the figure can also be used Nodes may be added, deleted or replaced, as long as the operation of the method in the embodiment of the present invention is not affected, the embodiment of the present invention is not limited here.

In addition, the second subnet mentioned anywhere in the present invention refers to the subnet where the VM resides before live migration; the first subnet mentioned anywhere in the present invention refers to the subnet where the VM resides after live migration.

In addition, in the present invention, the specific form of the CN communicating with the VM may be a PC, a virtual machine or other forms, which are not limited in this embodiment of the present invention.

FIG. 3 is a schematic flowchart of a routing configuration method after live migration of a virtual machine in a large Layer 2 network according to an embodiment of the present invention. The method in Fig. 3 is executed by the gateway.

301. The gateway obtains the address information of the VM migrating into the first subnet and the address information of the peer node CN communicating with the VM.

Wherein, the gateway is a gateway in the first subnet for exchanging data with an external network of the first subnet, and the VM is hot migrated from the second subnet to the first subnet. When the VM is hot-migrated to the first subnet, the IP address and MAC address remain unchanged.

Taking FIG. 2 as an example, the second subnet can establish a connection with the VM 108 through the tunnel between the VTEP 104 of the second subnet and the VTEP 106 of the first subnet. The GW107 of the first subnet can check the data packets carried by the tunnel between the VTEP104 and the VTEP106, discover the virtual machine VM108 migrated into the first subnet, and obtain the address information of the CN101 communicating with the VM108.

302. The gateway sends a channel establishment request message to the CN according to the address information of the CN.

Wherein, the channel establishment request message is used to request to establish a channel between the VM and the CN, and configure the channel on the route from the CN to the VM, and the channel is used to transmit data packets between the CN and the VM.

A scenario in which the gateway sends a channel establishment request message to the CN according to the address information of the CN may be shown in FIG. 5 . FIG. 5 is a schematic diagram of a scenario where a virtual machine requests channel establishment after live migration according to an embodiment of the present invention. In FIG. 5 , GW107 sends a tunnel establishment request to CN101 via router 105 to request to establish a tunnel between GW107 and CN101 and to configure the tunnel on the route between GW107 and CN101. In Fig. 5, although the tunnel between VTEP104 and VTEP106 also passes through router 105, it does not mean that the tunnel between VTEP104 and VTEP106 and the channel between GW107 and CN101 necessarily include the same router.

It can be seen that, in the embodiment of the present invention, the gateway obtains the address information of the VM that is live-migrated to the subnet where the gateway is located and the address information of the CN that communicates with the VM, and sends a channel establishment request message to the CN to establish a channel from the gateway to the CN and The channel is configured to route between CN and VM, which shortens the routing path between CN and VM, and can reduce the communication delay after VM live migration in a large Layer 2 network to a certain extent.

FIG. 4 is another schematic flowchart of a routing configuration method after live migration of a virtual machine in a large Layer 2 network according to an embodiment of the present invention.

Optionally, as shown in FIG. 4, after the gateway sends a channel establishment request message to the CN according to the address information of the CN, the method may further include:

303. The gateway receives a channel establishment confirmation message sent by the CN according to the channel establishment request message.

After the CN receives the channel establishment request message, if it agrees to establish the channel, it configures the port on the CN side of the channel, and sends a channel establishment confirmation message to the gateway, instructing the gateway to configure the port on the gateway side of the channel.

304. The gateway configures the channel on the port of the gateway according to the channel establishment confirmation message.

The gateway establishes a confirmation message according to the channel, and completes the configuration of the channel on the gateway side.

305. The gateway configures the channel on the route from the VM to the CN.

After the gateway establishes a channel, the channel can be configured on the route between the VM and the CN. At this time, the effect of the communication between the CN and the VM can be shown in FIG. 6 . FIG. 6 is a schematic diagram of routing configuration effects after live migration of a virtual machine in a large Layer 2 network according to an embodiment of the present invention. In Fig. 6, the data packet between CN101 and VM108 is transmitted through the channel between CN101 and GW107, and no longer passes through the second subnet.

It can be seen that in the embodiment of the present invention, the gateway configures the port of the channel on the gateway side according to the channel confirmation message, and configures the channel on the route from the VM to the CN, which shortens the routing path between the VM and the CN, and can to a certain extent To reduce the communication delay after VM live migration on a large Layer 2 network.

Optionally, in step 301, the gateway obtaining the address information of the VM relocated to the first subnet may include: the gateway obtaining an Address Resolution Protocol (Address Resolution Protocol, ARP) request packet from the second subnet and A subnet broadcasts the ARP request packet, the gateway obtains the ARP response packet returned by the VM according to the ARP request packet, and the gateway obtains the address information of the VM according to the ARP request packet and the ARP response packet. Wherein, the ARP request packet may carry the IP address information of the VM, the ARP response packet may carry the MAC address information of the VM, and the address information of the VM may include the IP address information of the VM and the MAC address information of the VM . After the gateway obtains the ARP response packet of the VM to the ARP request packet, it can confirm that the VM is a VM newly relocated to the first subnet, and obtain the address information (including IP address and MAC address) of the VM. At the same time, the second subnet can establish a communication route between the second subnet and the VM through the ARP process.

Further, the gateway acquiring the address information of the CN communicating with the VM may include: the gateway acquiring a data packet passing through the gateway and arriving at the VM, and the gateway acquiring the CN address information according to the data packet. Wherein, the data packet may carry the IP address information of the CN, and the address information of the CN may include the IP address information of the CN. Certainly, the data packet may also carry the IP address information of the VM and/or the MAC address information of the VM.

Optionally, the channel establishment request may carry the channel type, IP address information and port information of the gateway.

It can be seen that, in the embodiment of the present invention, the gateway establishes a channel with the CN by obtaining the address information of the VM that is live-migrated to the subnet where the gateway is located and the address information of the CN that communicates with the VM, and configures the channel between the VM and the CN. In terms of routing between VMs and CNs, the routing path between VMs and CNs is shortened, which can reduce the communication delay after VM hot migration in a large Layer 2 network to a certain extent.

The method in the embodiment of the present invention will be further described below in conjunction with specific embodiments.

FIG. 7 is a schematic flowchart of a communication method according to an embodiment of the present invention, which is applied to the application scenarios described in FIG. 1 , FIG. 2 , FIG. 5 or FIG. 6 . Wherein, the first subnet GW is a gateway in the first subnet for exchanging data with the external network of the first subnet, and the second subnet GW is a gateway for exchanging data with the external network of the second subnet in the second subnet. gateway.

701. The VM communicates with the CN on the second subnet.

702. The VM is hot-migrated from the second subnet to the first subnet.

Among them, the IP address and MAC address of the VM remain unchanged.

703. The second subnet GW sends an ARP request packet to the first subnet GW.

After the VM is hot-migrated from the second subnet to the first gateway, the second subnet can initiate an ARP process to the first subnet GW through the second subnet GW to obtain the next hop of the route from the second subnet GW to the VM address. Specifically, the second subnet GW may send an ARP request packet to the first subnet GW, and the ARP request packet carries the IP address information of the VM. Taking FIG. 2 as an example, GW103 can send an ARP request packet to GW107 through the tunnel between VTEP104 and VTEP106. At this time, the target IP address and target MAC address in the ARP request packet are the IP address of the VM and the MAC address of all 0s.

704. The first subnet GW broadcasts and sends the ARP request packet in the first subnet.

The first subnet GW may intercept the ARP request packet from the second subnet, and broadcast the ARP request packet in the first subnet.

705. The VM returns the ARP response packet of the ARP request packet to the first subnet GW.

After receiving the ARP request packet broadcast by the first subnet GW, the VM extracts the IP address of the target host carried in the ARP request packet. If the VM finds that the IP address is consistent with its own IP address, it is confirmed that the ARP request packet is sent to the VM. At this time, the VM may return the ARP response packet of the ARP request packet to the first subnetwork GW, and the ARP response packet carries the MAC address information of the VM.

At this time, the GW of the first subnet can determine the VM newly moved into the first subnet according to the ARP request packet and the ARP response packet of the ARP request packet, and obtain the IP address information and MAC address information of the VM.

Wherein, the method for the first subnetwork GW to obtain the IP address information and MAC address information of the VM according to the ARP request packet and the ARP response packet of the ARP request packet can be implemented with reference to the existing technology, and the embodiments of the present invention will not be repeated here.

706. The first subnet GW forwards the ARP response packet of the VM to the second subnet GW.

The first subnet GW forwards the ARP response packet of the VM to the second subnet GW, and the second subnet GW can establish a route from the second subnet to the VM according to the ARP response packet of the ARP request packet.

707. The second subnet GW establishes a route from the second subnet to the VM.

After receiving the ARP response packet sent by the VM, the GW of the second subnet may establish a route from the second subnet to the VM according to the ARP response packet.

708. The data packet sent by the CN to the VM is sent through the second subnetwork GW.

Wherein, the data packet may carry the IP address information of the CN. Of course, the target IP address pointed to by the data packet is the IP address of the VM, and the MAC address pointed to by the data packet is the MAC address of the VM. The first subnet GW can judge whether the data packet is Packets for the VM.

709. The data packet sent by the CN to the VM is sent through the first subnet GW.

710. The first subnet GW obtains the address information of the CN.

The first subnetwork GW can obtain the address information of the CN according to the data packet sent by the CN to the VM. The address information of the CN may include the IP address information of the CN.

The method for the first subnetwork GW to obtain the address information of the CN according to the data packet sent by the CN to the VM can be implemented with reference to the prior art, and the embodiments of the present invention will not be repeated here.

Certainly, the first subnetwork GW may forward the data packet to the VM, which will not be repeated in this embodiment of the present invention.

711. The first subnetwork GW sends a tunnel establishment request to the CN.

Taking Fig. 5 as an example, GW107 may initiate a channel establishment request to CN101 according to the extracted address information of CN101.

According to the IP address of the CN, the first subnet GW can send a channel establishment request to the CN. Wherein, the channel establishment request may carry the following information: the type of the channel, the IP address information and port information of the gateway.

Types of tunnels, including but not limited to IP tunnels, UDP tunnels, MAC tunnels, Application Layer Gateways (Application Layer Gateway, ALG), and Network Address Translation-Protocol (NAT-PT) with protocol translation.

Optionally, the channel establishment request may also carry the IP address information of the VM.

712. The CN configures the port of the channel on the CN according to the channel establishment request, and configures the channel to a route from the CN to the VM.

After the CN receives the channel establishment request, it can judge whether to agree to establish the channel according to the current state of the CN.

If the CN refuses to establish the channel, the communication route between the CN and the VM remains unchanged, and the embodiments of the present invention will not be repeated here.

If the CN agrees to establish the channel, establish the channel, configure the port of the channel on the CN, add the channel to the routing table entry of the CN, and configure the routing table item of the channel to the route from the CN to the VM.

713. The CN sends a tunnel establishment confirmation message to the first subnetwork GW.

After the CN completes the channel configuration on the CN side, it may send a channel establishment confirmation message to the first subnet GW requesting channel establishment, and the channel establishment confirmation message instructs the first subnet GW to complete the channel configuration on the first subnet GW side.

714. The first subnet GW configures the channel on the port of the first subnet GW, and configures the channel to the route from the VM to the CN.

The first subnet GW configures the port of the channel on the side of the first subnet GW according to the channel establishment confirmation message, and adds the channel to the routing table item of the first subnet GW, and configures the routing table item of the channel to the route from VM to CN middle.

715. The CN communicates with the VM through the channel.

Taking Fig. 6 as an example, the data packets between CN101 and VM108 are transmitted through the channel between CN101 and GW107, and no longer pass through the second subnet.

It can be seen that in the embodiment of the present invention, the first subnet GW shortens the route between the VM and the CN by establishing the channel between the first subnet GW and the CN and configuring the channel on the route between the VM and the CN. The path can reduce the communication delay after VM live migration in a large Layer 2 network to a certain extent.

FIG. 8 is a schematic structural diagram of a gateway 800 according to an embodiment of the present invention. The gateway 800 may include: an acquisition unit 801 and an output unit 802 .

The obtaining unit 801 is configured to obtain address information of a virtual machine VM migrated into the first subnet and address information of a peer node CN communicating with the VM. Wherein, the gateway 800 is a gateway in the first subnet for exchanging data with an external network of the first subnet, and the VM is hot migrated from the second subnet to the first subnet.

The output unit 802 is configured to send a channel establishment request message to the CN according to the address information of the CN. Wherein, the channel establishment request message may request to establish a channel between the gateway 800 and the CN, and update the channel to the route from the CN to the VM, and the channel is used to transmit data packets between the CN and the VM .

In the embodiment of the present invention, the gateway 800 obtains the address information of the VM that is live migrated to the subnet where the gateway 800 is located and the address information of the CN that communicates with the VM, and sends a channel establishment request message to the CN to establish a channel from the gateway 800 to the CN. And configure the channel to the route between CN and VM, which shortens the routing path between CN and VM, and reduces the communication delay after VM live migration in a large layer 2 network to a certain extent.

Optionally, the gateway 800 may further include an input unit 803 and a configuration unit 804 .

The input unit 803 is configured to receive a channel establishment confirmation message sent by the CN according to the channel establishment request message.

The configuration unit 804 is configured to configure the port of the channel on the gateway 800 according to the channel establishment confirmation message.

The configuration unit 804 is also configured to configure the channel on the route from the VM to the CN.

It can be seen that in the embodiment of the present invention, the gateway 800 configures the port of the channel on the gateway side according to the channel confirmation message, and configures the channel on the route from the VM to the CN, which shortens the routing path between the VM and the CN, and can ensure Minimize the communication delay after VM live migration in a large Layer 2 network.

Optionally, after obtaining the address information of the VM that migrated into the first subnet, the obtaining unit 801 is specifically configured to obtain the ARP request packet from the second subnet and broadcast the ARP request packet on the first subnet through the output unit 802 The request packet is used to obtain the ARP response packet returned by the VM according to the ARP request packet, and to obtain the address information of the VM according to the ARP request packet and the ARP response packet. Wherein, the ARP request packet may carry the IP address information of the VM, the ARP response packet may carry the MAC address information of the VM, and the address information of the VM may include the IP address information of the VM and the MAC address information of the VM ;

Correspondingly, the output unit 802 is further configured to broadcast and send the ARP request packet on the first subnet.

Optionally, when obtaining the address information of the CN communicating with the VM, the obtaining unit 801 is specifically configured to obtain a data packet arriving at the VM through the gateway 800, and obtain the address information of the CN according to the data packet. Wherein, the data packet may carry the IP address information of the CN, and the address information of the CN may include the IP address information of the CN.

Optionally, the channel establishment request message carries the channel type, IP address information and port information of the gateway 800 .

It can be seen that, in the embodiment of the present invention, the gateway 800 establishes a channel with the CN by obtaining the address information of the VM that is live-migrated to the subnet where the gateway 800 is located and the address information of the CN that communicates with the VM, and configures the channel between the VM and the CN. For routing between CNs, the routing path between VMs and CNs is shortened, which can reduce the communication delay after VM hot migration in a large Layer 2 network to a certain extent.

FIG. 9 is a schematic structural diagram of a gateway 900 according to an embodiment of the present invention. The gateway 900 may include an input device 901 , an output device 904 , a processor 902 and a memory 903 .

The memory 903 may include read-only memory and random-access memory, and provides instructions and data to the processor 902 . A portion of memory 903 may also include non-volatile random access memory (NVRAM).

The memory 903 stores the following elements, executable modules or data structures, or their subsets, or their extended sets:

Operation instructions: include various operation instructions for realizing various operations.

Operating system: includes various system programs for implementing various basic services and processing hardware-based tasks.

In the embodiment of the present invention, the processor 902 executes the following operations by calling the operation instruction stored in the memory 903 (the operation instruction can be stored in the operating system):

Obtain the address information of the virtual machine VM moving into the first subnet and the address information of the peer node CN communicating with the VM through the input device 901; send a channel establishment request message to the CN through the output device 904 according to the address information of the CN . Wherein, the gateway 900 is a gateway in the first subnet for exchanging data with the external network of the first subnet, the VM is hot migrated from the second subnet to the first subnet, and the channel establishment request message may request to establish The channel between the gateway 900 and the CN, and update the channel to the route from the CN to the VM, and the channel is used to transmit data packets between the CN and the VM.

It can be seen that, in the embodiment of the present invention, the gateway 900 obtains the address information of the VM that is live migrated to the subnet where the gateway 900 is located and the address information of the CN that communicates with the VM, and sends a channel establishment request message to the CN to establish a connection between the gateway 900 and the CN. Channel, and configure the channel as the route between CN and VM, shorten the routing path between CN and VM, and reduce the communication delay after VM hot migration in a large layer 2 network to a certain extent.

The processor 902 controls operations of the gateway 900, and the processor 902 may also be referred to as a CPU (Central Processing Unit, central processing unit). The memory 903 may include read-only memory and random-access memory, and provides instructions and data to the processor 902 . A portion of memory 903 may also include non-volatile random access memory (NVRAM). In a specific application, various components of the user equipment 900 are coupled together through a bus system 905, where the bus system 905 may include a power bus, a control bus, and a status signal bus in addition to a data bus. However, for clarity of illustration, the various buses are labeled as bus system 905 in the figure.

The methods disclosed in the foregoing embodiments of the present invention may be applied to the processor 902 or implemented by the processor 902 . The processor 902 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 902 or instructions in the form of software. The above-mentioned processor 902 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps and logic block diagrams disclosed in the embodiments of the present invention may be implemented or executed. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like. The steps of the methods disclosed in the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register. The storage medium is located in the memory 903, and the processor 902 reads the information in the memory 903, and completes the steps of the above method in combination with its hardware.

Optionally, the input device 901 can also receive the channel establishment confirmation message sent by the CN according to the channel establishment request message; the processor 902 can also configure the port of the channel on the gateway 900 according to the channel establishment confirmation message, and can make the channel Configure it on the route from the VM to the CN.

In the embodiment of the present invention, the gateway 900 configures the port of the channel on the gateway side according to the channel confirmation message, and configures the channel on the route from the VM to the CN, which shortens the routing path between the VM and the CN, and can to a certain extent Reduce the communication delay after VM live migration on a large Layer 2 network.

Optionally, after obtaining the address information of the VM migrating into the first subnet, the processor 902 may be specifically configured to obtain an ARP request packet from the second subnet, and broadcast the ARP request packet on the first subnet through the output device 904. For the ARP request packet, the ARP response packet returned by the VM according to the ARP request packet is obtained through the input device 901, and the address information of the VM is obtained according to the ARP request packet and the ARP response packet. Wherein, the ARP request packet may carry the IP address information of the VM, the ARP response packet may carry the MAC address information of the VM, and the address information of the VM may include the IP address information of the VM and the MAC address information of the VM .

Optionally, when obtaining the address information of the CN, the processor 902 may be specifically configured to obtain, through the input device 901, a data packet arriving at the VM via the gateway 900, and obtain the address information of the CN according to the data packet. Wherein, the data packet may carry the IP address information of the CN, and the address information of the CN may include the IP address information of the CN.

Optionally, the channel establishment request message carries the channel type, IP address information and port information of the gateway 900 .

In the embodiment of the present invention, the gateway 900 establishes a channel with the CN by acquiring the address information of the VM that is live-migrated to the subnet where the gateway 900 is located and the address information of the CN that communicates with the VM, and configures the channel between the VM and the CN. In terms of routing between VMs and CNs, the routing path between VMs and CNs is shortened, which can reduce the communication delay after VM hot migration in a large Layer 2 network to a certain extent.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, 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 only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units 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 may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, and other media that can store program codes. .

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. a routing configuration method after virtual machine hot migration in a large two-layer network, characterized in that, comprising: The gateway obtains the address information of the virtual machine VM migrated into the first subnet and the address information of the peer node CN communicating with the VM, wherein the gateway is used in the first subnet to communicate with the first a gateway for exchanging data with an external network of the subnet, and the VM is hot migrated from the second subnet to the first subnet; The gateway sends a channel establishment request message to the CN according to the address information of the CN, wherein the channel establishment request message is used to request establishment of a channel between the gateway and the CN and configure the channel to On the route from the CN to the VM, the channel is used to transmit data packets between the CN and the VM. 2. The method of claim 1, further comprising: The gateway receives the channel establishment confirmation message sent by the CN according to the channel establishment request message; The gateway configures the channel at a port of the gateway according to the channel establishment confirmation message; The gateway configures the channel on the route from the VM to the CN. 3. The method according to claim 1 or 2, wherein the gateway obtaining the address information of the virtual machine VM migrating into the first subnet comprises: The gateway acquires an Address Resolution Protocol ARP request packet from the second subnet, broadcasts and sends the ARP request packet on the first subnet, and the ARP request packet carries the Internet Protocol IP address information of the VM ; The gateway acquires the ARP response packet returned by the VM according to the ARP request packet, where the ARP response packet carries media access control MAC address information of the VM; The gateway obtains the address information of the VM according to the ARP request packet and the ARP response packet, and the address information of the VM includes the IP address of the VM and the MAC address of the VM. 4. The method according to claim 3, wherein said gateway obtaining address information of a peer node CN communicating with said VM comprises: The gateway acquires a data packet arriving at the VM through the gateway, the data packet carrying the IP address information of the CN; The gateway obtains the address information of the CN according to the data packet, and the address information of the CN includes the IP address information of the CN. 5. The method according to claim 1 or 2, wherein the channel establishment request message carries the channel type, IP address information and port information of the gateway. 6. A gateway, characterized in that, comprising: An obtaining unit, configured to obtain address information of a virtual machine VM migrated into the first subnet and address information of a peer node CN communicating with the VM, wherein the gateway is used in the first subnet to communicate with the a gateway for exchanging data with an external network of the first subnet, and the VM is hot migrated from the second subnet to the first subnet; an output unit, configured to send a channel establishment request message to the CN according to the address information of the CN, wherein the channel establishment request message is used to request establishment of a channel between the gateway and the CN and transfer the channel It is updated on the route from the CN to the VM, and the channel is used to transmit data packets between the CN and the VM. 7. The gateway according to claim 6, further comprising: an input unit, configured to receive a channel establishment confirmation message sent by the CN according to the channel establishment request message; a configuration unit, configured to configure a port of the channel on the gateway according to the channel establishment confirmation message; The configuring unit is further configured to configure the channel on the route from the VM to the CN. 8. The gateway according to claim 6 or 7, wherein when acquiring the address information of the virtual machine VM migrated into the first subnet, the acquiring unit is specifically configured to: acquire the address information from the second subnet Address Resolution Protocol ARP request packet, and broadcast the ARP request packet on the first subnet through the output unit, the ARP request packet carries the Internet protocol IP address information of the VM; obtain the VM according to An ARP response packet returned by the ARP request packet, the ARP response packet carrying media access control MAC address information of the VM; and obtaining the VM's address according to the ARP request packet and the ARP response packet address information, the address information of the VM includes the IP address of the VM and the MAC address of the VM; Correspondingly, the output unit is further configured to broadcast and send the ARP request packet on the first subnet. 9. The gateway according to claim 8, when acquiring the address information of the peer node CN communicating with the VM, the acquiring unit is specifically configured to: acquire data packets arriving at the VM through the gateway, the The data packet carries the IP address information of the CN; the address information of the CN is obtained according to the data packet, and the address information of the CN includes the IP address information of the CN. 10. The gateway according to claim 6 or 7, wherein the channel establishment request message carries the channel type, IP address information and port information of the gateway.