WO2018033153A1

WO2018033153A1 - Method and device for processing ip address conflict in evpn

Info

Publication number: WO2018033153A1
Application number: PCT/CN2017/098165
Authority: WO
Inventors: 刘冬梅; 李卓; 盛威; 王琳
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-08-18
Filing date: 2017-08-18
Publication date: 2018-02-22
Also published as: CN107770294A; CN107770294B

Abstract

A method and device for processing an internet protocol (IP) address conflict in an enhanced virtual private network (EVPN). The method is applicable to a first PE, and comprises: receiving a routing message from a second PE and containing an IP address and a medium access control (MAC) address of a local virtual machine of the second PE; and detecting, according to the routing information, an IP address conflict of IP addresses in an IP address-MAC address correspondence table maintained by the first PE; wherein the correspondence table records all IP addresses and MAC addresses in a broadcast domain of an EVPN.

Description

Method and device for processing IP address conflict in EVPN

Technical field

The present disclosure relates to the field of communications, for example, to a method and apparatus for processing IP address conflicts in an EVPN.

Background technique

In the Virtual Extensible Local Area Network (VXLAN)/Virtual Private LAN Service (VPLS) architecture, Media/Medium Access Control (MAC) learning is performed on the forwarding plane, which depends on The broadcast mechanism of the forwarding plane. The Internet Engineering Task Force (IETF) and the Level 2 Virtual Private Network (L2 VPN) working group proposed a new business model, Enhanced Virtual Private Network (EVPN). The service is distributed by the Multi-Protocol-Border Gateway Protocol (MP-BGP) control plane for media access control/Internet Protocol (IP) routing, thereby canceling the broadcast for the forwarding plane. Dependence.

The detection of Internet Protocol (IP) conflicts depends on the Address Resolution Protocol (ARP) broadcast message or the free ARP packet. Therefore, the EVPN service can also detect the virtual message while eliminating the broadcast message. Virtual machine (VM) IP address conflicts.

Summary of the invention

The present disclosure provides a method and a device for processing an IP address conflict in an EVPN, which solves the problem that the IP address conflict of the virtual machine cannot be detected due to the elimination of broadcast messages in the EVPN scenario.

The disclosure provides a method for processing a network protocol IP address conflict in an enhanced virtual private network (EVPN), which is applied to the first network side edge device PE, and includes:

Receiving a routing message from the second PE, where the routing message carries an IP address of the second PE local virtual machine VM and a medium access control MAC address;

Performing a conflict detection process on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message, where the correspondence table records all PE local VMs in a broadcast domain of the EVPN. IP address and MAC address.

The step of performing conflict detection processing on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message includes:

If the IP address from the second PE local VM conflicts with the IP address of the first PE local VM obtained through local learning, it is determined that the IP address from the second PE local VM is obtained and the IP address of the first PE local VM is obtained. The correspondence table is updated in order, and according to the IP address obtained later.

If the IP address from the second PE local VM conflicts with the IP address from the third PE local VM recorded in the correspondence table, according to a preset rule, the IP address from the second PE local VM and from the first Among the IP addresses of the three PE local VMs, an IP address is selected, and the correspondence table is updated according to the selected IP address.

The rule is that an IP address of a local VM corresponding to a PE with a smaller IP of the PE device is selected among the IP addresses of the plurality of PE local VMs, or an IP address specified in advance is selected;

The step of selecting an IP address from the IP address from the second PE local VM and the IP address from the third PE local VM includes:

Comparing the IP address of the second PE device with the IP address of the third PE device, selecting a PE with a smaller IP of the PE device from the IP address from the second PE local VM and the IP address from the third PE local VM The IP address of the corresponding local VM; or

A pre-designated IP address is selected from an IP address from the second PE local VM and an IP address from the third PE local VM.

The rule is that an IP address corresponding to a static MAC is selected among IP addresses of multiple PE local VMs or an IP address corresponding to a pre-designated MAC segment is selected;

Selecting an IP address corresponding to the static MAC from an IP address from the second PE local VM and an IP address from the third PE local VM; or

An IP address corresponding to the pre-designated MAC segment is selected from the IP address from the second PE local VM and the IP address from the third PE local VM.

The rule is that an IP address corresponding to the network identifier VNI of the smaller virtual scalable local area network is selected among the IP addresses of the plurality of PE local VMs or an IP address corresponding to the pre-designated VNI is selected;

Selecting an IP address corresponding to the smaller VNI from the IP address from the second PE local VM and the IP address from the third PE local VM; or

From the IP address from the second PE local VM and the IP address from the third PE local VM, Select an IP address that corresponds to the pre-assigned VNI.

If the IP address from the second PE local VM conflicts with the IP address of the first PE local VM, or the IP address from the second PE local VM conflicts with the IP address from the third PE local VM recorded in the correspondence table, If the collision duration exceeds the preset time threshold, an alarm is issued for the conflict.

The present disclosure also provides a processing device for a network protocol IP address conflict in an enhanced virtual private network (EVPN), which is applied to the first network side edge device PE, and includes:

a receiving module, configured to receive a routing message from the second PE, where the routing message carries an IP address of the second PE local virtual machine VM and a medium access control MAC address;

The conflict processing module is configured to perform a conflict detection process on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message, where the correspondence table records an EVPN IP address and MAC address of all PE local VMs in the broadcast domain.

The conflict processing module includes:

The first update unit is configured to determine, if the IP address from the second PE local VM conflicts with the IP address of the first PE local VM obtained through local learning, to obtain the IP address from the second PE local VM and obtain the first The IP address of the PE local VM is sequentially updated, and the correspondence table is updated according to the IP address obtained later.

The conflict processing module includes:

a second update unit, configured to: if an IP address from the second PE local VM conflicts with an IP address from the third PE local VM recorded in the correspondence table, according to a preset rule, from the second PE local Select one of the VM's IP address and the IP address from the third PE's local VM. The IP address is updated according to the selected IP address.

The embodiment further provides a computer readable storage medium storing computer executable instructions for performing a method for processing an IP address conflict in the EVPN.

The embodiment also provides a communication device including one or more processors, a memory, and one or more programs, the one or more programs being stored in the memory when executed by one or more processors The method for processing the IP address conflict in the above EVPN is performed.

The embodiment further provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, when the program instructions are executed by a computer And causing the computer to perform a processing method of IP address conflict in any of the above EVPNs.

The method for processing the IP address conflict in the EVPN of the present disclosure can perform the IP address conflict detection processing on the IP address of the VM synchronized by the remote PE in the EVPN scenario by maintaining the mapping table of the IP address-MAC address locally. If the IP address conflicts in the same broadcast domain are found, the problem that the virtual machine IP address conflict cannot be detected due to the elimination of broadcast packets in the EVPN scenario is solved.

DRAWINGS

FIG. 1 is a flowchart of a method for processing an IP address conflict in an EVPN according to an embodiment;

2 is a schematic diagram of an application environment of an IP address conflict processing method in an EVPN according to an embodiment of the present invention;

3 is a schematic structural diagram of an apparatus for processing an IP address conflict in an EVPN according to an embodiment of the present invention;

4 is a schematic structural diagram of another processing apparatus for conflicting IP addresses in an EVPN according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another processing apparatus for conflicting IP addresses in an EVPN according to an embodiment;

FIG. 6 is a schematic structural diagram of hardware of a communication device according to an embodiment of the present disclosure.

detailed description

The technical solutions of the present disclosure will be described below with reference to the accompanying drawings and embodiments.

A brief description of the IP address stated in this embodiment is as follows.

The IP address includes the IP address of the Provider Edge (PE) and the IP address of the VM. The method and device for processing the IP address conflict in the EVPN in this embodiment are directed to the conflict processing of the IP address of the VM. In this document, the IP addresses that are not explicitly stated are the IP addresses of the VM.

As shown in FIG. 1, the method for processing an IP address conflict in an EVPN in this embodiment is applied to a first PE, and the processing method includes the following steps.

In step 101, a routing message is received from the second PE, where the routing message carries an IP address and a MAC address of the second PE local virtual machine VM.

After learning the IP address and MAC address of the local VM, the second PE routes the MAC/IP address to the remote PE (the first PE) through the MP-BGP protocol. The routing message of the second PE may be a MAC/IP route advertisement Advertisement Route message.

In step 102, a conflict detection process is performed on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message, where the correspondence table records a broadcast of the EVPN. IP address and MAC address of all PE local VMs in the domain.

All the PEs in the broadcast domain of the EVPN will synchronize the IP address and MAC address of the local VM to the remote PE. Therefore, the first PE can learn the IP addresses and MAC addresses of all PE local VMs in the broadcast domain and save them to the locally maintained IP address. Address-MAC address correspondence table. The correspondence table can perform IP address collision detection processing on the IP addresses of VMs routed by other PEs.

The PEs in the same broadcast domain have the same VXLAN Network Identifier (VNI) or are located in the same VPN.

The method for processing the IP address conflict in the EVPN in this embodiment is to maintain the IP address-MAC locally. In the EVPN scenario, the IP address conflict detection process is performed on the IP address of the VM that is synchronized by the remote PE in the EVPN scenario, and the IP address conflicts in the same broadcast domain are found in the EVPN scenario. The problem is that the virtual machine IP address conflict cannot be detected.

Optionally, the foregoing step 102 may further include the following steps.

If the IP address of the second PE local VM conflicts with the IP address of the first PE local VM, the IP address obtained afterwards and the corresponding MAC address are selected as effective addresses, so that the newly obtained IP address can be obtained during the virtual machine migration. Updates can prevent virtual machines from migrating to invalid IP addresses, ensuring efficient virtual machine migration.

Alternatively, one of the IP address of the second PE local VM and the IP address of the first PE local VM may be selected as the effective address by static configuration. For example, the IP address of the VM of the local PE (first PE) is selected as the effective address, or the IP address of the VM of the remote PE (second PE) is selected as the effective address.

Optionally, the foregoing step 102 may further include the following steps.

If the IP address of the second PE local VM conflicts with the IP address of the third PE local VM, the IP address corresponding to the priority and the corresponding MAC address are selected as effective addresses according to a preset rule. It can prevent attacks from other illegal addresses and improve network security and reliability.

The rules for the IP address of the local PE (the first PE) and the remote PE (the second PE and the third PE) should be the same. If the IP address of the second PE local VM conflicts with the IP address of the third PE local VM, the first PE selects the IP address of the second PE local VM as the effective address, and the second PE and the third PE should also select the first The IP address of the second PE local VM is a valid address.

Optionally, the rule is to select an IP address of a local VM corresponding to a PE with a smaller IP of the PE device among the IP addresses of the multiple PE local VMs, or select a pre-designated IP address.

The IP address of the VM corresponding to the PE with the smaller PE IP address is high. Therefore, you can select the IP address of the VM corresponding to the PE with the smaller PE IP address as the effective address. In addition, you can also specify the IP address that takes precedence based on historical experience.

Based on the above rules, in the foregoing step, selecting an IP address from the IP address from the second PE local VM and the IP address from the third PE local VM may include the following steps.

In this embodiment, by selecting the IP address of the VM corresponding to the PE with a small PE device IP address or selecting the IP address of the VM specified in advance, an IP address with high security can be obtained to prevent an attack.

The IP address of the local PE device and the IP address of the remote PE device can be obtained through the MP-BGP tunnel information.

Optionally, the rule is: selecting an IP address corresponding to the static MAC among the IP addresses of the multiple PE local VMs or selecting an IP address corresponding to the pre-designated MAC segment.

The IP address corresponding to the static MAC address is high. Therefore, you can select the IP address corresponding to the static MAC address as the effective address. In addition, the priority-effective MAC segment can be specified based on historical experience, and the corresponding IP address can be obtained.

In this embodiment, an IP address corresponding to a static MAC address or an IP address corresponding to a pre-designated MAC segment is selected to obtain a highly secure IP address to prevent an attack.

Optionally, the rule is to select an IP address corresponding to a smaller VNI among the IP addresses of the plurality of PE local VMs or select an IP address corresponding to the pre-designated VNI.

In the case where the VNI is small, the IP address corresponding to the smaller VNI is highly secure, so the IP address corresponding to the smaller VNI can be selected as the effective address. In addition, the priority effective VNI can be specified based on historical experience, and the corresponding IP address can be obtained.

The above rules based on the VNI are for PEs located in the same VPN.

Based on the above rules, in the above step, selecting an IP address from the IP address from the second PE local VM and the IP address from the third PE local VM includes the following steps.

An IP address corresponding to the pre-designated VNI is selected from the IP address from the second PE local VM and the IP address from the third PE local VM.

By selecting an IP address corresponding to a smaller VNI or selecting an IP address corresponding to a pre-designated VNI, a highly secure IP address can be obtained to prevent an attack.

Optionally, the step of step 102 above may further include the following steps.

When the same IP address exists in the same broadcast domain and the duration exceeds the preset time threshold, an alarm is generated for the IP address conflict to notify the other device of the IP address conflict.

A specific application case of the processing method of this embodiment is exemplified as follows.

As shown in Figure 2, it is assumed that PE A, PE B, and PE C are located in the same broadcast domain of the EVPN. PE B uses the MP-BGP protocol to spread the MAC address of the local VM and sends the information of the MAC B to PE A and PE C. PE C also uses the MP-BGP protocol to spread the MAC address of the local VM and sends the MAC C information to PE A and PE B. The IP addresses of PE B and PE C are the same.

PE B finds that it conflicts with the IP address of the VM of the PE C, selects the IP address obtained after it takes effect, and updates the local IP address-MAC address correspondence table.

Similarly, PE C finds that the IP address of the VM of PE B conflicts, selects the IP address obtained later, and updates the local IP address-MAC address correspondence table.

The PE A finds that the MAC addresses from different remote ends correspond to the IP addresses of the same VMs, that is, the IP addresses of the VMs from the PE B conflict with the IP addresses of the VMs from the PE C, and select the IP with higher priority according to the preset rules. The address takes effect and the local IP address-MAC address correspondence table is updated. If the collision duration exceeds the preset time threshold, an alarm is issued to the conflict situation to notify other devices PE B and The IP address conflict of the PE C VM.

The IP addresses that PE A, PE B, and PE C choose to take effect should be consistent.

The method for processing the IP address conflict in the EVPN in this embodiment can perform the IP address conflict detection process on the IP address of the VM synchronized by the remote PE in the EVPN scenario by maintaining the mapping table of the IP address-MAC address locally. The IP address conflicts in the same broadcast domain can be discovered in a timely manner. This solves the problem that the IP address conflict of the virtual machine cannot be detected due to the elimination of broadcast packets in the EVPN scenario.

As shown in FIG. 3, the embodiment further provides an apparatus for processing an IP address conflict in an EVPN, which is applied to a first PE, and the processing apparatus includes the following modules.

The receiving module 310 is configured to receive a routing message from the second PE, where the routing message carries an IP address and a MAC address of the second PE local virtual machine VM.

The conflict processing module 320 is configured to perform an IP address conflict detection process on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message, where the correspondence relationship table records The IP address and MAC address of all PE local VMs in a broadcast domain with EVPN.

The device for processing the IP address conflict in the EVPN in the embodiment can perform the IP address conflict detection process on the IP address of the VM synchronized by the remote PE in the EVPN scenario by maintaining the mapping table of the IP address-MAC address locally. The IP address conflicts in the same broadcast domain can be discovered in a timely manner. This solves the problem that the IP address conflict of the virtual machine cannot be detected due to the elimination of broadcast packets in the EVPN scenario.

Optionally, the conflict processing module 320 includes a first update unit 321, as shown in FIG.

The first update unit 321 is configured to determine, if the IP address from the second PE local VM conflicts with the IP address of the first PE local VM obtained through local learning, to obtain the IP address from the second PE local VM and obtain the first The order of the IP addresses of the PE local VMs is updated, and the correspondence table is updated according to the IP addresses obtained later.

Optionally, the conflict processing module 320 includes a second update unit 322, as shown in FIG.

The second update unit 322 is configured to: if the IP address from the second PE local VM conflicts with the IP address of the third PE local VM recorded in the correspondence table, according to a preset rule, from the second PE An IP address is selected from an IP address of the local VM and an IP address from the third PE local VM, and the correspondence table is updated according to the selected IP address.

The second update unit may include a first selection unit.

a first selecting unit, configured to compare an IP address of the second PE device with an IP address of the third PE device, and select a PE from an IP address from the second PE local VM and an IP address from the third PE local VM IP address of the local VM corresponding to the PE with the smaller IP address of the device. Alternatively, the second update unit may include a second selection unit.

The second selection unit is configured to select a pre-designated IP address from an IP address from the second PE local VM and an IP address from the third PE local VM.

The second update unit may include the following selection unit.

The third selection unit is configured to select an IP address corresponding to the static MAC from the IP address from the second PE local VM and the IP address from the third PE local VM. Or the second update unit may include a fourth selection unit.

And a fourth selecting unit, configured to select an IP address corresponding to the pre-designated MAC segment from the IP address from the second PE local VM and the IP address from the third PE local VM.

Optionally, the rule is to select, in the IP addresses of the multiple PE local VMs, to correspond to the smaller VNIs. The IP address or the IP address corresponding to the pre-designated VNI.

The second update unit may include the following selection unit.

The fifth selection unit is configured to select an IP address corresponding to the smaller VNI from the IP address from the second PE local VM and the IP address from the third PE local VM. Or the second update unit may include a sixth selection unit.

The sixth selection unit is configured to select an IP address corresponding to the pre-designated VNI from the IP address from the second PE local VM and the IP address from the third PE local VM.

Optionally, the conflict processing module further includes an alarm unit.

The alarm unit is configured to: if the IP address from the second PE local VM conflicts with the IP address of the first PE local VM, or the IP address from the second PE local VM and the third PE local VM recorded in the correspondence table If the IP address conflicts and the collision duration exceeds the preset time threshold, an alarm is generated for the conflict.

The processing device for the IP address conflict in the EVPN is a device corresponding to the processing method of the IP address conflict in the EVPN, wherein all the implementation manners in the foregoing method embodiments are applicable to the embodiment of the device, and the same technology can be achieved. effect.

The embodiment further provides a computer readable storage medium storing computer executable instructions for performing the above method.

FIG. 6 is a schematic diagram showing the hardware structure of a communication device according to the present embodiment. As shown in FIG. 6, the electronic device includes: one or more processors 410 and a memory 420. One processor 410 is shown in FIG. For example.

The communication device may also include an input device 430 and an output device 440.

The processor 410, the memory 420, the input device 430, and the output device 440 in the communication device may be connected by a bus or other means, and the bus connection is taken as an example in FIG.

The input device 430 can receive input numeric or character information, and the output device 440 can include a display device such as a display screen.

The memory 420 is a computer readable storage medium that can be used to store software programs, computer executable programs, and modules. The processor 410 executes various functional applications and data processing by executing software programs, instructions, and modules stored in the memory 420 to implement any of the above-described embodiments.

The memory 420 may include a storage program area and an storage data area, wherein the storage program area may store an operating system, an application required for at least one function; the storage data area may store data created according to usage of the electronic device, and the like. In addition, the memory may include volatile memory such as random access memory (RAM), and may also include non-volatile memory such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device.

Memory 420 can be a non-transitory computer storage medium or a transitory computer storage medium. The non-transitory computer storage medium, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 420 can optionally include memory remotely located relative to processor 410, which can be connected to the electronic device over a network. Examples of the above networks may include the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

Input device 430 can be used to receive input digital or character information and to generate key signal inputs related to user settings and function control of the electronic device. Output device 440 can include a display device such as a display screen.

The electronic device of the present embodiment may further include a communication device 450 that transmits and/or receives information over a communication network.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by executing related hardware by a computer program, and the program can be stored in a non-transitory computer readable storage medium. The program, when executed, may include the flow of an embodiment of the method as described above, wherein the non-transitory computer readable storage medium may be a magnetic disk, an optical disk, a read only memory (ROM), or a random access memory (RAM). Wait.

Industrial applicability

The method and device for processing an IP address conflict in the EVPN provided by the present disclosure can perform IP address conflict detection on the IP address of the VM synchronized by the remote PE in the EVPN scenario by locally maintaining the correspondence table of the IP address-MAC address. If the IP address conflicts in the same broadcast domain are found, the IP address conflict between the virtual machine and the virtual machine cannot be detected in the EVPN scenario.

Claims

A method for processing a network protocol IP address conflict in an enhanced virtual private network (EVPN) is applied to a first network side edge device PE, including:

Receiving a routing message from the second PE, where the routing message carries an IP address of the second PE local virtual machine VM and a medium access control MAC address;

Performing a conflict detection process on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message, where the correspondence table records all PE local VMs in a broadcast domain of the EVPN. IP address and MAC address.
The processing method according to claim 1, wherein the step of performing collision detection processing on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message includes:

If the IP address from the second PE local VM conflicts with the IP address of the first PE local VM obtained through local learning, it is determined that the IP address from the second PE local VM is obtained and the IP address of the first PE local VM is obtained. The correspondence table is updated in order, and according to the IP address obtained later.
The processing method according to claim 1, wherein the step of performing collision detection processing on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message includes:

If the IP address from the second PE local VM conflicts with the IP address from the third PE local VM recorded in the correspondence table, according to a preset rule, the IP address from the second PE local VM and from the first Among the IP addresses of the three PE local VMs, an IP address is selected, and the correspondence table is updated according to the selected IP address.
The processing method according to claim 3, wherein the rule is to select an IP address or a selection of a local VM corresponding to a PE with a smaller IP of the PE device among the IP addresses of the plurality of PE local VMs. a pre-designated IP address;

The step of selecting an IP address from the IP address from the second PE local VM and the IP address from the third PE local VM includes:

Comparing the IP address of the second PE device with the IP address of the third PE device, selecting a PE with a smaller IP of the PE device from the IP address from the second PE local VM and the IP address from the third PE local VM The IP address of the corresponding local VM; or

A pre-designated IP address is selected from an IP address from the second PE local VM and an IP address from the third PE local VM.
The processing method according to claim 3, wherein the rule is to select an IP address corresponding to a static MAC among IP addresses of a plurality of PE local VMs or select an IP address corresponding to a pre-designated MAC segment;

The step of selecting an IP address from the IP address from the second PE local VM and the IP address from the third PE includes:

Selecting an IP address corresponding to the static MAC from an IP address from the second PE local VM and an IP address from the third PE local VM; or

An IP address corresponding to the pre-designated MAC segment is selected from the IP address from the second PE local VM and the IP address from the third PE local VM.
The processing method according to claim 3, wherein the rule is to select an IP address corresponding to the network identifier VNI of the smaller virtual scalable local area network among the IP addresses of the plurality of PE local VMs or to select and correspond to the pre-designated VNI IP address;

The step of selecting an IP address from the IP address from the second PE local VM and the IP address from the third PE local VM includes:

From the IP address from the second PE local VM and the IP address from the third PE local VM, Select an IP address that corresponds to the smaller VNI; or

An IP address corresponding to the pre-designated VNI is selected from the IP address from the second PE local VM and the IP address from the third PE local VM.
The processing method according to any one of claims 1-6, wherein the conflict detection processing is performed on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message. The steps include:

If the IP address from the second PE local VM conflicts with the IP address of the first PE local VM, or the IP address from the second PE local VM conflicts with the IP address from the third PE local VM recorded in the correspondence table, If the collision duration exceeds the preset time threshold, an alarm is issued for the conflict.
A device for processing a network protocol IP address conflict in an enhanced virtual private network (EVPN) is applied to a first network side edge device PE, including:

a receiving module, configured to receive a routing message from the second PE, where the routing message carries an IP address of the second PE local virtual machine VM and a medium access control MAC address;

The conflict processing module is configured to perform a conflict detection process on the IP address in the correspondence table of the IP address-MAC address locally maintained by the first PE according to the routing message, where the correspondence table records an EVPN IP address and MAC address of all PE local VMs in the broadcast domain.
The processing device of claim 8, wherein the conflict handling module comprises:

The first update unit is configured to determine, if the IP address from the second PE local VM conflicts with the IP address of the first PE local VM obtained through local learning, to obtain the IP address from the second PE local VM and obtain the first The IP address of the PE local VM is sequentially updated, and the correspondence table is updated according to the IP address obtained later.
The processing device of claim 8, wherein the conflict handling module comprises:

a second update unit, configured to: if an IP address from the second PE local VM conflicts with an IP address from the third PE local VM recorded in the correspondence table, according to a preset rule, from the second PE local Among the IP address of the VM and the IP address from the third PE local VM, an IP address is selected, and the correspondence table is updated according to the selected IP address.
A computer readable storage medium storing computer executable instructions for performing the method of any of claims 1-7.