CN110752989A - A kind of east-west traffic forwarding method and device - Google Patents

Abstract

The invention discloses a method and a device for forwarding east-west flow, comprising the following steps: acquiring an address resolution protocol table entry of the virtual machine, and storing the address resolution protocol table entry into a routing table recording network segment routing table entries to be used as a host route; generating a border gateway protocol table item and a border gateway protocol route for a host route in a routing table, and building an external border gateway protocol networking for transmitting the host route; transmitting host routing between the virtual machines through an external border gateway protocol networking by using a routing table longest matching rule to forward east-west traffic; the address resolution protocol entry is updated in response to an aging time to the address resolution protocol entry. The invention uses the traditional routing protocol to realize the flow forwarding in east and west directions, avoids developing a new routing protocol, and has simple networking mode and high stability.

Description

A kind of east-west traffic forwarding method and device

technical field

The present invention relates to the field of network communication, and more particularly, to a method and device for forwarding east-west traffic.

Background technique

Due to the rise of cloud computing and large-scale applications, the main traffic in the data center has changed from north-south traffic to east-west traffic. It is difficult to forward east-west traffic through traditional switching routes; for example, there are two IP addresses of A and B in the network that are on the same network segment (for example, both are on the 100.168.1.0/24 network segment). When publishing routes, the routers in the middle do not know how to forward them. , because both A and B are on the same network segment 100.168.1.0/24. At present, the methods for realizing remote communication between hosts on the same network segment in data centers include SDN Vxlan (Software Defined Network Virtual Scalable Local Area Network), EVPN (Ethernet Virtual Private Network) Vxlan, and NAT (Network Address Translation). Among them, the Vxlan (Virtual Extensible Local Area Network) protocol is complicated to implement and has high requirements for switches; NAT (Network Address Translation) technology is not suitable for large-scale data center networking. The prior art lacks a means of utilizing traditional routing protocols to realize efficient communication of east-west traffic between hosts in the same network segment of an IDC (Internet Data Center) data center.

Aiming at the problem in the prior art that the data center cannot use the traditional routing protocol to realize east-west traffic forwarding, there is currently no effective solution.

SUMMARY OF THE INVENTION

In view of this, the purpose of the embodiments of the present invention is to provide an east-west traffic forwarding method and device, which can realize east-west traffic forwarding using traditional routing protocols, avoid developing new routing protocols, and have a simple networking mode and high stability.

Based on the above purpose, a first aspect of the embodiments of the present invention provides a method for forwarding east-west traffic, including performing the following steps:

Obtain the address resolution protocol entry of the virtual machine, and store the address resolution protocol entry in the routing table recording the network segment routing entry as the host route;

Generate BGP entries and BGP routes for host routes in the routing table, and build an external BGP network for transmitting host routes;

Use the longest matching principle of the routing table to pass host routes between virtual machines through external border gateway protocol networking to forward east-west traffic;

The address resolution protocol entry is updated in response to reaching the aging time of the address resolution protocol entry.

In some embodiments, the address resolution protocol entry has a longer mask than the network segment routing entry; using the routing table longest match principle to pass the host route between the virtual machines through the external border gateway protocol networking includes: preferential forwarding Address resolution protocol entries with longer masks instead of network segment routing entries.

In some embodiments, updating an address resolution protocol entry includes the following steps:

Initiate an address resolution protocol request to the virtual machine;

In response to the virtual machine not responding to the address resolution protocol request, delete the host route related to the virtual machine and the border gateway protocol entry and border gateway protocol route corresponding to the host route;

Stop updating address resolution protocol entries.

In some embodiments, updating the address resolution protocol entry further includes the following steps:

In response to the virtual machine responding to the address resolution protocol request, determine whether the address resolution protocol entry has changed according to the response;

In response to the address resolution protocol entry not changing, the aging time of the address resolution protocol request is updated, and the host routing and border gateway protocol entries are not updated.

In some embodiments, updating the address resolution protocol entry further includes the following steps:

In response to a change in the address resolution protocol table entry, it is determined that the change is a medium access address change or an interface change;

Not updating host routing and border gateway protocol entries in response to a change to a medium access address change;

In response to the change being an interface change, the host route, and the BGP entry and BGP route corresponding to the host route are updated according to the change.

A second aspect of the embodiments of the present invention provides an east-west traffic forwarding device, including:

processor; and

A memory that stores program code executable by the processor, the program code performing the following steps when executed:

Obtain the address resolution protocol entry of the virtual machine, and store the address resolution protocol entry in the routing table recording the network segment routing entry as the host route;

Generate BGP entries and BGP routes for host routes in the routing table, and build an external BGP network for transmitting host routes;

Use the longest matching principle of the routing table to pass host routes between virtual machines through external border gateway protocol networking to forward east-west traffic;

The address resolution protocol entry is updated in response to reaching the aging time of the address resolution protocol entry.

In some embodiments, the address resolution protocol entry has a longer mask than the network segment routing entry; using the routing table longest match principle to pass the host route between the virtual machines through the external border gateway protocol networking includes: preferential forwarding Address resolution protocol entries with longer masks instead of network segment routing entries.

In some embodiments, updating an address resolution protocol entry includes the following steps:

Initiate an address resolution protocol request to the virtual machine;

In response to the virtual machine not responding to the address resolution protocol request, delete the host route related to the virtual machine and the border gateway protocol entry and border gateway protocol route corresponding to the host route;

Stop updating address resolution protocol entries.

In some embodiments, updating the address resolution protocol entry further includes the following steps:

In response to the virtual machine responding to the address resolution protocol request, determine whether the address resolution protocol entry has changed according to the response;

In response to the address resolution protocol entry not changing, the aging time of the address resolution protocol request is updated, and the host routing and border gateway protocol entries are not updated.

In some embodiments, updating the address resolution protocol entry further includes the following steps:

In response to a change in the address resolution protocol table entry, it is determined that the change is a medium access address change or an interface change;

Not updating host routing and border gateway protocol entries in response to a change to a medium access address change;

In response to the change being an interface change, the host route, and the BGP entry and BGP route corresponding to the host route are updated according to the change.

The present invention has the following beneficial technical effects: the method and device for forwarding east-west traffic provided by the embodiments of the present invention obtain the address resolution protocol table entry of the virtual machine, and store the address resolution protocol table entry in the route that records the network segment routing table entry. The table is used as the host route; the border gateway protocol entry and the border gateway protocol route are generated for the host route in the routing table, and the external border gateway protocol network for transmitting the host route is built; the longest matching principle of the routing table is used to pass the external border The gateway protocol networking transfers host routes between virtual machines to forward east-west traffic; the technical solution of updating the address resolution protocol entry in response to the aging time of the arrival address resolution protocol entry can use traditional routing protocols to realize east-west traffic Forwarding, avoiding the development of new routing protocols, simple networking mode and high stability.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces 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 These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic flowchart of a method for forwarding east-west traffic provided by the present invention;

2 is a detailed flowchart of a method for updating an address resolution protocol table entry of the east-west traffic forwarding method provided by the present invention;

FIG. 3 is a global connection relationship diagram of the east-west traffic forwarding apparatus provided by the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities with the same name but not the same or non-identical parameters. It can be seen that "first" and "second" It is only for the convenience of expression and should not be construed as a limitation to the embodiments of the present invention, and subsequent embodiments will not describe them one by one.

Based on the above objective, the first aspect of the embodiments of the present invention provides an embodiment of a method for implementing east-west traffic forwarding by using a traditional routing protocol. FIG. 1 shows a schematic flowchart of the east-west traffic forwarding method provided by the present invention.

The east-west traffic forwarding method, as shown in Figure 1, includes the following steps:

Step S101: Acquire an address resolution protocol entry of the virtual machine, and store the address resolution protocol entry in a routing table recording the network segment routing entry as a host route;

Step S103: generating a border gateway protocol entry and a border gateway protocol route for the host route in the routing table, and building an external border gateway protocol network for transferring the host route;

Step S105: use the longest matching principle of the routing table to transfer the host route between the virtual machines through the external border gateway protocol networking, so as to forward the east-west traffic;

Step S107: Update the address resolution protocol entry in response to reaching the aging time of the address resolution protocol entry.

The implementation of the traditional Vxlan (Virtual Extensible Local Area Network) protocol is very complicated; a Vxlan tunnel needs to be established. When transmitting, the data packet is encapsulated with the ip (Internet Protocol address) address of the Vxlan (Virtual Extensible Local Area Network) tunnel for transmission; yes A large Layer 2 transmission network that completes the forwarding of east-west traffic. Arp (Address Resolution Protocol) to host routing communication, the implementation is simple; no need to build a tunnel; when used, the learned Arp (Address Resolution Protocol) entry is converted into a 32-bit host route, which is passed to the BGP (Border Gateway Protocol). The remote router uses the maximum matching principle (that is, the more accurate routing entries are preferentially matched) when using the route query; it realizes east-west traffic forwarding. The Vxlan (Virtual Extensible Local Area Network) of the present invention is to build a virtual two-layer network in a three-layer network. When using Vxlan (Virtual Extensible Local Area Network), a Vxlan (Virtual Extensible Local Area Network) tunnel is generally established, and a MAC in UDP (User Data Protocol) encapsulation method is used. Vxlan (Virtual Extensible Local Area Network) encapsulates the data packets sent by the virtual machine in UDP (User Datagram Protocol), and uses the IP (Internet Protocol address) and MAC (Ethernet address) addresses of the physical network as the outer header. Encapsulation, which is only represented as an encapsulated parameter to the network. When the data reaches the peer end of the tunnel, it decapsulates and forwards it at Layer 2.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. , may include the flow of the above-mentioned method embodiments. The storage medium may be a magnetic disk, an optical disk, a read only memory (ROM), or a random access memory (RAM), or the like. The embodiments of the computer program can achieve the same or similar effects as any of the foregoing method embodiments corresponding thereto.

In some embodiments, the address resolution protocol entry has a longer mask than the network segment routing entry; using the routing table longest match principle to pass the host route between the virtual machines through the external border gateway protocol networking includes: preferential forwarding Address resolution protocol entries with longer masks instead of network segment routing entries.

In some embodiments, updating an address resolution protocol entry includes the following steps:

Initiate an address resolution protocol request to the virtual machine;

In response to the virtual machine not responding to the address resolution protocol request, delete the host route related to the virtual machine and the border gateway protocol entry and border gateway protocol route corresponding to the host route;

Stop updating address resolution protocol entries.

In some embodiments, updating the address resolution protocol entry further includes the following steps:

In response to the virtual machine responding to the address resolution protocol request, determine whether the address resolution protocol entry has changed according to the response;

In response to the address resolution protocol entry not changing, the aging time of the address resolution protocol request is updated, and the host routing and border gateway protocol entries are not updated.

In some embodiments, updating the address resolution protocol entry further includes the following steps:

In response to a change in the address resolution protocol table entry, it is determined that the change is a medium access address change or an interface change;

Not updating host routing and border gateway protocol entries in response to a change to a medium access address change;

In response to the change being an interface change, the host route, and the BGP entry and BGP route corresponding to the host route are updated according to the change.

The methods disclosed according to the embodiments of the present invention may also be implemented as a computer program executed by the CPU, and the computer program may be stored in a computer-readable storage medium. When the computer program is executed by the CPU, the above-mentioned functions defined in the methods disclosed in the embodiments of the present invention are executed. The above-mentioned method steps and system units can also be implemented by a controller and a computer-readable storage medium for storing a computer program that enables the controller to implement the functions of the above-mentioned steps or units.

As shown in Figure 3, traffic forwarding needs to be implemented between VM1 (VM, virtual machine) and VM3 (VM, virtual machine), because they are the same network segment and are separated by many other subnets. Ordinary Layer 3 forwarding cannot be implemented. Currently, data center traffic is forwarded from east to west, usually using Vxlan (Virtual Extensible Local Area Network) technology. The VSW (Virtual Switch) on the server is used as the VxlanVTEP (Vxlan Tunnel Endpoint) node, and the Vxlan (Virtual Scalable Local Area Network) technology is used on the switch to realize data communication between nodes between two identical subnets. The implementation of the Vxlan (Virtual Extensible Local Area Network) protocol is complex, and the R&D and testing resources are huge. If the switch TOR (top-of-the-cabinet device) can convert Arp (Address Resolution Protocol) into host routing, because VM (virtual machine) is isolated by different VLANs (Virtual Local Area Network), VSW (Virtual Switch) Layer 2 forwarding, by TOR (cabinet) The top device) acts as the GW (gateway) of the host. In this way, we can use the traditional BGP (Border Gateway Protocol) protocol to advertise the BGP (Border Gateway Protocol) route to the remote TOR (top-of-the-cabinet device) device, so as to realize the connection between two same network segment VM (VM, virtual machine). East-West traffic forwarding.

First, the switch learns the Arp (Address Resolution Protocol) entries of the host VM (VM, virtual machine), and converts the Arp (Address Resolution Protocol) entries into host routes; then, BGP (Border Gateway Protocol) routing is enabled on the switch device protocol, which introduces host routes into BGP (Border Gateway Protocol) routing protocol; for data center networking, EBGP (External Border Gateway Protocol) neighbor relationship is used to complete the transfer of host routing information through BGP (Border Gateway Protocol) routing protocol; As a result, between two VM (VM, virtual machine) nodes in the same subnet, the east-west traffic can be forwarded by using the longest matching principle of the routing table.

The aging update mode of the present invention is further described below according to the specific embodiment of FIG. 2 .

When the Arp (Address Resolution Protocol) entry of the switch ages out, a new Arp (Address Resolution Protocol) request process will be triggered. The switch will actively initiate an Arp (Address Resolution Protocol) request to the host.

If the host does not respond and the Arp (Address Resolution Protocol) is not re-learned, the switch deletes the host route corresponding to the Arp (Address Resolution Protocol) entry. After the host route is deleted, the BGP (Border Gateway Protocol) will send a BGPupdate (Border Gateway Protocol) update message to delete the BGP (Border Gateway Protocol) routing table entry corresponding to the host route. After receiving the BGP update (Border Gateway Protocol) update message, delete the corresponding BGP (Border Gateway Protocol) routing table entry, and complete the update of the BGP (Border Gateway Protocol) routing table entry.

If the host replies with an Arp reply (Address Resolution Protocol response) and the Arp (Address Resolution Protocol) entry has not changed at this time, only the Arp (Address Resolution Protocol) aging time will be updated, and the host routing table entry will not be updated. BGP (Border Gateway Protocol) ) entry is not updated.

If the Arp (Address Resolution Protocol) entry changes at this time, it is necessary to determine whether the MAC address changes or the interface changes. If the MAC (Ethernet address) address corresponding to the host ip (Internet Protocol address) address changes, the host routing table entry does not change. Update, the BGP (Border Gateway Protocol) entry is not updated; if the interface of the Arp (Address Resolution Protocol) entry changes, the host route is updated, and the BGP (Border Gateway Protocol) sends a BGP update (Border Gateway Protocol) update message, other switches After receiving the BGP update (Border Gateway Protocol) update message, the BGP (Border Gateway Protocol) routing information update is completed.

It can be seen from the above embodiments that the east-west traffic forwarding method provided by the embodiments of the present invention obtains the address resolution protocol entry of the virtual machine, and stores the address resolution protocol entry in the routing table that records the network segment routing entry As a host route; generate BGP entries and BGP routes for the host routes in the routing table, and build an external BGP network for transmitting host routes; use the longest matching principle in the routing table to pass the external BGP The networking transfers host routes between virtual machines to forward east-west traffic; the technical solution of updating the address resolution protocol entry in response to the aging time of the arrival address resolution protocol entry can use traditional routing protocols to realize east-west traffic forwarding, Avoid developing new routing protocols, and the networking mode is simple and stable.

It should be particularly pointed out that the steps in each embodiment of the above-mentioned east-west traffic forwarding method can be intersected, replaced, added, and deleted. Therefore, these reasonable permutations and combinations should also belong to the east-west traffic forwarding method. The protection scope of the present invention should not be limited to the embodiments described above.

Based on the above objective, a second aspect of the embodiments of the present invention provides an embodiment of an apparatus capable of implementing east-west traffic forwarding by using a traditional routing protocol. East-west traffic forwarding devices include:

processor; and

A memory that stores program code executable by the processor that, when executed, performs the following steps in response to successively writing data to the flash memory:

Obtain the address resolution protocol entry of the virtual machine, and store the address resolution protocol entry in the routing table recording the network segment routing entry as the host route;

Generate BGP entries and BGP routes for host routes in the routing table, and build an external BGP network for transmitting host routes;

Use the longest matching principle of the routing table to pass host routes between virtual machines through external border gateway protocol networking to forward east-west traffic;

The address resolution protocol entry is updated in response to reaching the aging time of the address resolution protocol entry.

In some embodiments, the address resolution protocol entry has a longer mask than the network segment routing entry; using the routing table longest match principle to pass the host route between the virtual machines through the external border gateway protocol networking includes: preferential forwarding Address resolution protocol entries with longer masks instead of network segment routing entries.

In some embodiments, updating an address resolution protocol entry includes the following steps:

Initiate an address resolution protocol request to the virtual machine;

In response to the virtual machine not responding to the address resolution protocol request, delete the host route related to the virtual machine and the border gateway protocol entry and border gateway protocol route corresponding to the host route;

Stop updating address resolution protocol entries.

In some embodiments, updating the address resolution protocol entry further includes the following steps:

In response to the virtual machine responding to the address resolution protocol request, determine whether the address resolution protocol entry has changed according to the response;

In response to the address resolution protocol entry not changing, the aging time of the address resolution protocol request is updated, and the host routing and border gateway protocol entries are not updated.

In some embodiments, updating the address resolution protocol entry further includes the following steps:

In response to a change in the address resolution protocol table entry, it is determined that the change is a medium access address change or an interface change;

Not updating host routing and border gateway protocol entries in response to a change to a medium access address change;

In response to the change being an interface change, the host route, and the BGP entry and BGP route corresponding to the host route are updated according to the change.

As shown in Figure 3, the switch converts the learned Arp (Address Resolution Protocol) entry into a host route. And import the learned host route into the BGP (Border Gateway Protocol) routing protocol. Because the EBGP (External Border Gateway Protocol) neighbor relationship is usually used between the TOR (top of the cabinet) and the leaf (leaf) device in the data center, BGP (Border Gateway Protocol) route transfer is realized. In this way, if it is mounted under different TOR (top-of-the-cabinet equipment) devices, data forwarding can be realized between hosts on the same network segment. The design is not only simple and practical, but also requires only switches to implement Arp (Address Resolution Protocol)-to-host routing, and the existing BGP (Border Gateway Protocol) protocol can be used to realize data center east-west traffic without investing a lot of R&D resources. forwarding between.

It can be seen from the above embodiments that the east-west traffic forwarding device provided by the embodiments of the present invention obtains the address resolution protocol entry of the virtual machine, and stores the address resolution protocol entry in the routing table that records the network segment routing entry As a host route; generate BGP entries and BGP routes for the host routes in the routing table, and build an external BGP network for transmitting host routes; use the longest matching principle in the routing table to pass the external BGP The networking transfers host routes between virtual machines to forward east-west traffic; the technical solution of updating the address resolution protocol entry in response to the aging time of the arrival address resolution protocol entry can use traditional routing protocols to realize east-west traffic forwarding, Avoid developing new routing protocols, and the networking mode is simple and stable.

It should be particularly pointed out that the above-mentioned embodiments of the east-west traffic forwarding apparatus use the embodiments of the east-west traffic forwarding method to specifically describe the working process of each module. Those skilled in the art can easily imagine that these modules are applied to In other embodiments of the east-west traffic forwarding method. Of course, since each step in the embodiment of the east-west traffic forwarding method can be crossed, replaced, added, and deleted, these reasonable permutations and combinations should also belong to the present invention for the east-west traffic forwarding device The scope of protection of the present invention should not be limited to the described embodiments.

The above are exemplary embodiments of the present disclosure, but it should be noted that various changes and modifications may be made without departing from the scope of the disclosure of the embodiments of the present invention as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements disclosed in the embodiments of the present invention may be described or claimed in the singular, unless explicitly limited to the singular, the plural may also be construed.

It should be understood that, as used herein, the singular form "a" is intended to include the plural form as well, unless the context clearly supports an exception. It will also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items. The above-mentioned embodiments of the present invention disclose the serial numbers of the embodiments only for description, and do not represent the advantages and disadvantages of the embodiments.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above embodiments can be completed by hardware, or can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, etc.

Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope (including the claims) disclosed by the embodiments of the present invention is limited to these examples; under the idea of the embodiments of the present invention , the technical features of the above embodiments or different embodiments can also be combined, and there are many other variations of the different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention should be included within the protection scope of the embodiments of the present invention.

Claims (10)

1. a kind of east-west traffic forwarding method, is characterized in that, comprises the following steps: Obtaining an address resolution protocol entry of the virtual machine, and storing the address resolution protocol entry in the routing table recording the network segment routing entry as a host route; generating a border gateway protocol entry and a border gateway protocol route for the host route in the routing table, and building an external border gateway protocol network for transmitting the host route; Passing the host route between virtual machines through the external border gateway protocol networking using the longest matching principle of the routing table to forward east-west traffic; The address resolution protocol entry is updated in response to reaching the aging time of the address resolution protocol entry. 2. The method according to claim 1, wherein the address resolution protocol entry has a longer mask than the network segment routing entry; Passing the host route between the virtual machines through the external border gateway protocol networking using the longest matching principle of the routing table includes: preferentially forwarding the ARP entry with the longer mask instead of the network segment routing table entry. 3. The method according to claim 1, wherein updating the ARP table entry comprises the following steps: Initiating an address resolution protocol request to the virtual machine; In response to the virtual machine not responding to the address resolution protocol request, delete the host route related to the virtual machine and the border gateway protocol entry and the border gateway protocol route corresponding to the host route ; Stop updating the address resolution protocol entry. 4. The method according to claim 3, wherein updating the ARP table entry further comprises the following steps: In response to the virtual machine responding to the address resolution protocol request, determining whether the address resolution protocol entry has changed according to the response; In response to the address resolution protocol entry not changing, the aging time of the address resolution protocol request is updated, and the host route and the border gateway protocol entry are not updated. 5. The method according to claim 4, wherein updating the address resolution protocol entry further comprises the following steps: In response to a change in the address resolution protocol entry, judging that the change is a medium access address change or an interface change; not updating the host route and the border gateway protocol entry in response to the change being a medium access address change; In response to the change being an interface change, the host route, the BGP entry corresponding to the host route, and the BGP route are updated according to the change. 6. An east-west traffic forwarding device, comprising: processor; and A memory storing program code executable by the processor, the program code performing the following steps when executed: Obtaining the address resolution protocol entry of the virtual machine, and storing the address resolution protocol entry in the routing table recording the network segment routing entry as the host route; generating a border gateway protocol entry and a border gateway protocol route for the host route in the routing table, and building an external border gateway protocol network for transmitting the host route; Passing the host route between virtual machines through the external border gateway protocol networking using the longest matching principle of the routing table to forward east-west traffic; The address resolution protocol entry is updated in response to reaching the aging time of the address resolution protocol entry. 7. The apparatus according to claim 6, wherein the address resolution protocol entry has a longer mask than the network segment routing entry; Passing the host route between the virtual machines through the external border gateway protocol networking using the longest matching principle of the routing table includes: preferentially forwarding the ARP entry with the longer mask instead of the network segment routing table entry. 8. The apparatus according to claim 6, wherein updating the ARP table entry comprises the following steps: Initiating an address resolution protocol request to the virtual machine; In response to the virtual machine not responding to the address resolution protocol request, delete the host route related to the virtual machine and the border gateway protocol entry and the border gateway protocol route corresponding to the host route ; Stop updating the address resolution protocol entry. 9. The apparatus according to claim 8, wherein updating the address resolution protocol entry further comprises the following steps: In response to the virtual machine responding to the address resolution protocol request, determining whether the address resolution protocol entry has changed according to the response; In response to the address resolution protocol entry not changing, the aging time of the address resolution protocol request is updated, and the host route and the border gateway protocol entry are not updated. 10. The device according to claim 9, wherein updating the address resolution protocol entry further comprises the following steps: In response to a change in the address resolution protocol entry, judging that the change is a medium access address change or an interface change; not updating the host route and the border gateway protocol entry in response to the change being a medium access address change; In response to the change being an interface change, the host route, the BGP entry corresponding to the host route, and the BGP route are updated according to the change.

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