WO2017219868A1

WO2017219868A1 - Arp entry processing method and apparatus

Info

Publication number: WO2017219868A1
Application number: PCT/CN2017/087584
Authority: WO
Inventors: 林宁
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-06-21
Filing date: 2017-06-08
Publication date: 2017-12-28
Also published as: CN107528929A; CN107528929B

Abstract

An ARP entry processing method comprises: detecting a service interruption signal corresponding to a MAC address; when the service interruption signal is detected, obtaining an ARP entry corresponding to the MAC address; and directing a next hop address of a host route corresponding to the ARP entry to a specified egress.

Description

ARP entry processing method and device

Technical field

Embodiments of the present invention relate to, but are not limited to, the field of communications, and in particular, to a method and an apparatus for processing an Address Resolution Protocol (ARP) entry.

Background technique

In general, the ARP entry is forwarded by using the host route in the device, and the ARP exit information is determined by the MAC (Media Access Control) address. In the process of MAC learning, it is possible. A MAC address aging condition occurs. At this time, the ARP entry needs to be re-triggered by the ARP request. After the ARP request is responded, the ARP entry will be updated according to the status of the ARP response packet, and the host route will be true. Updated, or was actually deleted.

However, due to the certain time difference between the MAC address aging of the device and the ARP update, the update of the ARP entry may be lagging. Even if the Layer 3 traffic continues to pass through, the worst case is that there is no data flow. The central processing unit (CPU) is sent to trigger the sending of the ARP request message, so the ARP entry exists, and the MAC address entry does not exist, and the Layer 3 traffic continues to the port pointed to by the original MAC address. The error condition of the forwarding, this condition will continue until the ARP entry ages before it can be terminated. In other words, this abnormal traffic will be determined by the aging time of the ARP entry.

The steps of ARP forwarding after the MAC address of a device is aging in the related art are as follows:

1. The MAC address is aging.

2. There is no change in the ARP entry. The host route still exists. The data forwarded through this host route is still running through. An ARP request packet is sent until the ARP timer keeps alive.

3. If the ARP request packet is responded, the new MAC address is learned, the ARP entry is updated, the device's new host routing entry is delivered, and the original host routing entry is modified to be the new MAC address exit.

4. If the ARP request packet is not responded, the ARP keepalive timer expires and is deleted. Except for ARP entries, host routes are deleted and abnormal forwarding traffic stops.

It can be seen that, in the related art, when the MAC address is aged, the ARP must wait until the keep-alive mechanism finds a new valid MAC entry, or it has to wait until the ARP entry is deleted by the aging time, and the abnormal traffic forwarded through the ARP entry will be Change or termination.

In order to prevent this problem from occurring on a general device, the method used is mostly to set the aging time of the ARP entry to be slightly larger than the aging time of the MAC address. This mechanism is used to minimize the transit time of abnormal traffic, but it cannot solve the abnormality fundamentally. Traffic problem.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the present invention provides a method and a device for processing an ARP entry, so as to solve at least the problem that the ARP must wait for the MAC address to be re-learned or ARP aging to process the traffic forwarding when the MAC address is aged.

According to an embodiment of the present invention, a method for processing an ARP entry is provided, including: detecting a service interruption signal corresponding to a MAC address; and acquiring an ARP entry corresponding to the MAC address when the service interruption signal is detected; Pointing the next hop address of the host route corresponding to the ARP entry to the designated exit.

In an exemplary embodiment, when the MAC address is a failed MAC address, the designated exit is a black hole exit, and the black hole exit is an exit that cannot forward traffic.

In an exemplary embodiment, after the next hop address of the host route corresponding to the ARP entry is directed to the designated exit, the method further includes: routing the message of the host corresponding to the ARP entry. And/or discarded by the last hop of the ARP entry.

In an exemplary embodiment, before the next hop address of the host route corresponding to the ARP entry is directed to the black hole exit, the method further includes: sending an ARP keep-alive message to the user side device; When receiving the response packet of the ARP keepalive packet, the next hop address of the host route corresponding to the ARP entry is directed to the black hole exit.

In an exemplary embodiment, when receiving the response message of the ARP keepalive message, The next hop address of the host route corresponding to the ARP entry is directed to the designated port, where the designated port is a port for implementing forwarding service traffic.

In an exemplary embodiment, when the MAC address is a MAC address learned by a designated port, the designated egress is a designated port, where the designated port is a port for implementing forwarding service traffic.

In an exemplary embodiment, after the next hop address of the host route corresponding to the ARP entry is directed to the designated exit, the method further includes: routing the message of the host corresponding to the ARP entry. And/or the message forwarded by the last hop of the ARP entry is forwarded by the designated port.

According to another embodiment of the present invention, an apparatus for processing an ARP entry is provided, including: a detecting module, configured to: detect a service interruption signal corresponding to a MAC address; and an acquiring module configured to: detect the service interruption signal Obtaining an ARP entry corresponding to the MAC address; the first pointing module is configured to: point a next hop address of the host route corresponding to the ARP entry to the designated exit.

In an exemplary embodiment, the apparatus further includes: a discarding module, configured to: forward the message of the host corresponding to the ARP entry and/or forward the message by the last hop of the ARP entry The message is discarded.

In an exemplary embodiment, the apparatus further includes: a sending module, configured to: send an ARP keep-alive message to the user side device; and the second pointing module is configured to: not receive the ARP keep-alive message The next hop address of the host route corresponding to the ARP entry points to the black hole exit.

In an exemplary embodiment, the apparatus further includes: a third pointing module, configured to: when receiving the response message of the ARP keep-alive message, routing the host corresponding to the ARP entry The one-hop address is directed to the designated port, where the designated port is a port for implementing forwarding traffic.

In an exemplary embodiment, when the MAC address is a MAC learned by a designated port In the case of an address, the designated egress is a designated port, where the designated port is a port for implementing forwarding service traffic.

In an exemplary embodiment, the apparatus further includes: a forwarding module, configured to: after the first pointing module points the next hop address of the host route corresponding to the ARP entry to the designated exit, The packet of the host route corresponding to the ARP entry and/or the packet forwarded by the last hop of the ARP entry is forwarded by the designated port.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is arranged to store program code for performing the following steps:

S11. Detect a service interruption signal corresponding to the MAC address.

S12. Acquire an ARP entry corresponding to the MAC address when the service interruption signal is detected.

S13. Point the next hop address of the host route corresponding to the ARP entry to the designated exit.

In an exemplary embodiment, the storage medium is further configured to store program code for performing the following steps:

S21. Discard the packet of the host route corresponding to the ARP entry and/or the packet forwarded by the previous hop of the ARP entry.

S31. The packet of the host route corresponding to the ARP entry and/or the packet forwarded by the last hop of the ARP entry are forwarded by the designated port.

The embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, the method for processing the ARP entry being implemented when the computer executable instructions are executed.

In the embodiment of the present invention, the ARP entry is obtained by the MAC address of the interrupt signal, and the next hop address of the host route corresponding to the entry is directed to the designated egress. Learning or ARP entry aging can deal with traffic forwarding, thus achieving the effect of timely processing traffic forwarding when the MAC address changes.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a block diagram showing the hardware structure of a computer terminal for processing an ARP entry according to an embodiment of the present invention;

2 is a flowchart of a method for processing an ARP entry according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an application scenario 1 of a method for processing an ARP entry according to an embodiment of the present invention; FIG.

4 is a schematic diagram of an application scenario 2 of a method for processing an ARP entry according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an application scenario 3 of a method for processing an ARP entry according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of an application scenario 4 of a method for processing an ARP entry according to an embodiment of the present invention; FIG.

FIG. 7 is a structural diagram of an apparatus for processing an ARP entry according to an embodiment of the present invention; FIG.

FIG. 8 is a structural diagram of another apparatus for processing an ARP entry according to an embodiment of the present invention; FIG.

9 is a structural diagram of still another apparatus for processing an ARP entry according to an embodiment of the present invention;

FIG. 10 is a structural diagram of still another apparatus for processing an ARP entry according to an embodiment of the present invention; FIG.

FIG. 11 is a structural diagram of a processing apparatus for an ARP entry according to an embodiment of the present invention.

Preferred embodiment of the invention

Embodiments of the present invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the various manners in the embodiments may be combined with each other without conflict.

It should be noted that the terms "first", "second" and the like are used herein to distinguish similar objects, and are not necessarily used to describe a particular order or order.

If the MAC address aging is triggered, the ARP entry will be added or deleted frequently. If the MAC address is turbulent, the ARP entry will be added and deleted frequently. The invalidation of the ARP entry will cause more serious route invalidation. The agreement expires, so it will intensify the network The route is turbulent. Therefore, in the related art, when the MAC address is aged, the ARP must wait until the MAC address is re-learned or the ARP entry is aged to process the traffic forwarding. There is no better solution.

Example 1

The method embodiment provided in Embodiment 1 of the present application can be executed in a mobile terminal, a computer terminal or the like. Taking a computer terminal as an example, FIG. 1 is a block diagram showing the hardware structure of a computer terminal for processing an ARP entry according to an embodiment of the present invention. As shown in FIG. 1, computer terminal 10 may include one or more (only one shown) processor 102 (processor 102 may include, but is not limited to, a Micro Controller Unit (MCU) or A processing device such as a programmable logic device FPGA (Field Programmable Gate Array), a memory 104 for storing data, and a transmission device 106 for communication functions. It will be understood by those skilled in the art that the structure shown in FIG. 1 is merely illustrative and does not limit the structure of the above electronic device. For example, computer terminal 10 may also include more or fewer components than those shown in FIG. 1, or have a different configuration than that shown in FIG.

The memory 104 can be used to store software programs and modules of the application software, such as program instructions/modules corresponding to the processing method of the ARP entry in the embodiment of the present invention, and the processor 102 executes by executing the software program and the module stored in the memory 104. Various functional applications and data processing, that is, the above methods are implemented. Memory 104 may include high speed random access memory, and may also include non-volatile memory such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, memory 104 may also include memory remotely located relative to processor 102, which may be coupled to computer terminal 10 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Transmission device 106 can be used to receive or transmit data via a network. The network specific examples described above may include a wireless network provided by a communication provider of the computer terminal 10. In one example, the transmission device 106 includes a Network Interface Controller (NIC) that can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device 106 can be a Radio Frequency (RF) module for communicating with the Internet wirelessly.

In this embodiment, a method for processing an ARP entry running on a computer terminal is provided. 2 is a flowchart of a method for processing an ARP entry according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:

Step S202, detecting a service interruption signal corresponding to the MAC address;

Optionally, the foregoing service interruption signal is reported by the hardware device. That is to say, when the MAC address aging or the MAC address is learned in the hardware device, service interruption information is generated.

Step S204: Acquire an ARP entry corresponding to the MAC address when the service interruption signal is detected;

Optionally, when the ARP entry corresponding to the MAC address is obtained, the software table of the ARP is queried according to the obtained MAC address, and the ARP entry related to the obtained MAC address is determined during the searching process of the software table. The software table includes one or more ARP entries.

Step S206, pointing the next hop address of the host route corresponding to the ARP entry to the designated exit.

Optionally, if the obtained MAC address is a MAC address that is deleted due to aging, the designated egress may be a black hole egress, where the black hole egress is an egress that cannot forward traffic.

Optionally, the packet of the host route corresponding to the ARP entry and/or the packet forwarded by the previous hop of the ARP entry are discarded at the black hole exit.

Optionally, since the failure of some MAC addresses is not caused by the deletion of the MTC address represented by the aging of the MAC address, but the temporary failure caused by changing the port used for forwarding the traffic, if the host route is directed directly If the black hole is exported, you need to transfer the host route blackhole exit to the designated port after changing the port. This process is very redundant, and delays traffic forwarding, causing a bad experience for the user. Therefore, before the next hop address of the host route corresponding to the ARP entry (that is, the egress of the host route) is directed to the designated egress, the ARP keep-alive packet is sent to the user-side device, if the user-side device sends the packet. If the ARP keepalive message responds, it means that the MAC address failure is not due to the MAC address deletion caused by the MAC address aging, but the temporary failure caused by changing the port used to forward traffic. Then the host route will be invalid. According to the packet, determine the port pointed to by the next hop address of the host route and continue to enter The traffic is forwarded, and if no response is received, the host route is directed to the blackhole exit according to the original method to implement traffic forwarding.

Optionally, if the obtained MAC address is a MAC address learned by the designated port, the designated egress may be a designated port, where the designated port is a port for implementing forwarding service traffic.

Optionally, after the next hop address of the host route corresponding to the ARP entry is directed to the designated exit, the message of the host route corresponding to the ARP entry and/or the previous one of the ARP entry is The packet forwarded by the hop is forwarded by the designated port.

It should be noted that the packet forwarded by the last hop of the ARP entry may be a packet sent by the sub-route connected to the host route to the host route.

In the meantime, the following scenarios are also provided in this embodiment, so as to understand the technical solution in this embodiment:

It should be noted that the route 10.10.10.0 255.255.255.0 points to the ARP entry 10.10.10.1, its associated MAC address is 00:11:22:33:44:55, and the exit is port 1.

scene 1

MAC address 00:11:22:33:44:55 aging. FIG. 3 is a schematic diagram of an application scenario 1 of a method for processing an ARP entry according to an embodiment of the present invention. As shown in Figure 3, the following steps are included:

The S1 and ARP entry processing devices receive an interrupt signal that the MAC address of the 00:11:22:33:44:55 reported by the hardware device is deleted.

The S2, ARP entry processing device receives the message that the MAC address of 00:11:22:33:44:55 is deleted, and queries its own software table to find that the ARP entry 10.10.10.1 is related to the MAC address.

S3. The ARP entry processing device sets the exit of the host route corresponding to the ARP entry 10.10.0.1 to port 0xFFFFFFFF (the black hole exit that does not exist).

S4. Packets of the host route with the traffic destined for 10.10.10.1 are discarded. Packets forwarded by the route 10.10.10.0 are modified to black hole exits because the next hop of the host route 10.10.10.1 is changed to 10.10. The forwarding traffic of the 10.0 route is also discarded.

At this point, the action of suppressing the forwarding of the abnormal host route with the MAC address failure is completed. Therefore, all the routes of the host are hit, or the next hop is the network segment forwarding traffic of the host route. They are all discarded immediately.

Scene 2

FIG. 4 is a schematic diagram of an application scenario 2 of a method for processing an ARP entry according to an embodiment of the present invention. As shown in Figure 4, the following steps are included:

S1, the MAC address after the failure is 00:11:22:33:44:55 and is learned again on port 1.

The S2 and the ARP entry processing device receive the interrupt signal learned by the MAC address of the 00:11:22:33:44:55 reported by the hardware device on the port 1.

The S3, ARP entry processing device receives the message that the MAC address of 00:11:22:33:44:55 is learned on port 1, and queries its own software table to find that the ARP entry 10.10.10.1 is related to the MAC address.

S4. The ARP entry processing device sets the ARP entry 10.10.0.1 corresponding to the host route to point to port 1

S5. The host route that forwards the traffic hits 10.10.10.1 and the packet forwarded by the route 10.10.10.0. Because the egress of the next hop host route 10.10.10.1 is changed to port 1, the traffic is immediately restored to port 1. Forward.

At this point, the behavior of the MAC address being learned again and the forwarding is resumed.

Scene 3

FIG. 5 is a schematic diagram of an application scenario 3 of a method for processing an ARP entry according to an embodiment of the present invention. As shown in Figure 5, the following steps are included:

S1, the MAC address after invalidation 00:11:22:33:44:55 drifted to port 2 and was learned.

The S2, the ARP entry processing device receives the interrupt signal learned by the MAC address of the 00:11:22:33:44:55 reported by the hardware device on the port 2.

The S3, ARP entry processing device receives the message that the MAC address of 00:11:22:33:44:55 is learned on port 2, and queries its own software table to find that 10.10.10.1 is related to the MAC address.

S4. The ARP entry processing device sets the exit of the host route corresponding to the ARP entry 10.10.0.1 to point to port 2.

S5. The host route that forwards the traffic hits 10.10.10.1 and the packet forwarded by the route 10.10.10.0. Because the egress of the next hop host route 10.10.10.1 is changed to port 2, the traffic is immediately restored to port 2. Forward.

At this point, the MAC address is drifted and the traffic is completely forwarded to the new port.

Scene 4

Immediately trigger the invalid MAC address 00:11:22:33:44:55 related ARP entry 10.10.10.1 keepalive mechanism. FIG. 6 is a schematic diagram of an application scenario 4 of a method for processing an ARP entry according to an embodiment of the present invention. As shown in Figure 6, the following steps are included:

The S2 and ARP entry processing devices attempt to send ARP keep-alive messages before setting the egress of the host route corresponding to the ARP entry 10.10.10.1 to the blackhole exit.

S3. If the response packet of the ARP keepalive packet is received, modify the ARP entry exit according to the content of the response packet, and update the host routing table.

S4. If the response packet of the ARP keep-alive packet is not received, the ARP entry exit is first directed to the blackhole exit, and then the ARP timer keep-alive mechanism is awaiting further processing.

At this point, when the completion of the MAC address failure occurs, the ARP immediately triggers the ARP to perform the keep-alive action. This action can make a confirmation before the traffic is cut off to ensure that the link is as normal as possible.

After the MAC address is aged out, the ARP must wait until the MAC address is re-learned or ARP aging to process the traffic forwarding. This can achieve the effect of timely processing the traffic forwarding when the MAC address changes. .

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A preferred embodiment. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium (such as ROM/RAM, disk). , CD), including a number of instructions to make a terminal device (can It is a mobile phone, a computer, a server, or a network device, etc.) to perform the method described in the embodiments of the present invention.

Example 2

In the embodiment, a processing device for the ARP entry is provided, and the device is configured to implement the foregoing embodiment and the optional implementation manner, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 7 is a structural diagram of a processing apparatus for an ARP entry according to an embodiment of the present invention. As shown in FIG. 7, the apparatus includes:

The detecting module 72 is configured to: detect a service interruption signal corresponding to the MAC address;

The obtaining module 74 is configured to: when detecting the service interruption signal, acquire an ARP entry corresponding to the MAC address;

The first pointing module 76 is configured to point the next hop address of the host route corresponding to the ARP entry to the designated exit.

Optionally, when the MAC address is a failed MAC address, the designated egress is a black hole egress, and the black hole egress is an egress that cannot forward service traffic.

FIG. 8 is a structural diagram of another apparatus for processing an ARP entry according to an embodiment of the present invention. As shown in FIG. 8, the apparatus includes, in addition to all the modules shown in FIG. 7, when the designated exit is a black hole exit. :

The discarding module 82 is configured to discard the packet routed by the host corresponding to the ARP entry and/or the packet forwarded by the previous hop of the ARP entry.

The failure of some MAC addresses is not caused by the deletion of the MTC address represented by the aging of the MAC address, but the temporary failure caused by changing the port used to forward traffic. Therefore, if the host route is directly directed to the black hole exit, Then you need to transfer the host route blackhole exit to the designated port after changing the port. This process is very redundant, and delays traffic forwarding, causing a bad experience for the user. FIG. 9 is a structural diagram of another apparatus for processing an ARP entry according to an embodiment of the present invention. As shown in FIG. 9, in addition to all the modules shown in FIG. 8, the method further includes:

The sending module 92 is configured to: send an ARP keep-alive message to the user side device;

The second directional module 94 is configured to: when the response packet of the ARP keep-alive packet is not received, point the next hop address of the host route corresponding to the ARP entry to the black hole exit.

FIG. 10 is a structural diagram of still another apparatus for processing an ARP entry according to an embodiment of the present invention. As shown in FIG. 10, in addition to the modules other than the second pointing module 94, all of the modules shown in FIG. 9 are included. :

The third directional module 1002 is configured to: when receiving the response message of the ARP keepalive message, point the next hop address of the host route corresponding to the ARP entry to the designated port, where the designated port is The port used to implement forwarding traffic.

Optionally, when the MAC address is a MAC address learned by the designated port, the designated egress is a designated port, where the designated port is a port used to implement forwarding service traffic.

Optionally, the second pointing module 94 is further included.

11 is a structural diagram of a processing apparatus for an ARP entry according to an embodiment of the present invention. As shown in FIG. 11, when the designated egress is a designated port for learning a MAC address, all but the one shown in FIG. Also included outside the module are:

The forwarding module 1102 is configured to: after the first directional module 76 points the next hop address of the host route corresponding to the ARP entry to the designated egress, the packet routed by the host corresponding to the ARP entry And/or the message forwarded by the last hop of the ARP entry is forwarded by the designated port.

It should be noted that the above modules can be implemented by software or hardware, and for the latter, This is achieved by, but not limited to, the above modules are all located in the same processor; or the above modules are respectively located in different processors in any combination.

The processing device of the ARP entry may be a device corresponding to the processing method of the foregoing ARP entry, and all the implementation manners in the foregoing method embodiments may be applied to the embodiment of the device, and the same technical effect can be achieved.

Example 3

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S11. Detect a service interruption signal corresponding to the MAC address.

Optionally, the storage medium is further arranged to store program code for performing the following steps:

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

Example 4

Obviously, those skilled in the art can understand the above-mentioned modules or steps of the embodiments of the present invention. It can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed over a network of multiple computing devices. Alternatively, they can be implemented by program code executable by the computing device, such that They may be stored in a storage device by a computing device, and in some cases, the steps shown or described may be performed in an order different than that herein, or they may be separately fabricated into different integrated circuit modules. Or by making multiple modules or steps among them into a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, processor, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.

The devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

A person skilled in the art can understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application. The scope of protection of this application is defined by the scope defined by the claims.

Industrial applicability

In the embodiment of the present invention, the ARP entry is obtained by the MAC address of the interrupt signal, and the next hop of the host route corresponding to the entry is directed to the designated egress. Therefore, when the MAC address is aged, the ARP must wait until the MAC address is re-established. After learning or ARP aging, the problem of traffic forwarding can be handled, so that the traffic forwarding can be processed in time when the MAC address changes.

Claims

A method for processing an address resolution protocol ARP entry includes:

Detecting a service interruption signal corresponding to the media access control MAC address;

Obtaining an ARP entry corresponding to the MAC address when the service interruption signal is detected;

Pointing the next hop address of the host route corresponding to the ARP entry to the designated exit.
The method of claim 1, wherein when the MAC address is a failed MAC address, the designated exit is a black hole exit, and wherein the black hole exit is an exit that cannot forward traffic.
The method of claim 2, after the next hop address of the host route corresponding to the ARP entry is directed to the designated exit, the method further includes:

The packet of the host route corresponding to the ARP entry and/or the packet forwarded by the previous hop of the ARP entry are discarded.
The method of claim 2, before the next hop address of the host route corresponding to the ARP entry is directed to the black hole exit, the method further includes:

Send an ARP keep-alive message to the user-side device.

When the response packet of the ARP keepalive packet is not received, the next hop address of the host route corresponding to the ARP entry is directed to the black hole exit.
The method of claim 4, further comprising:

When the response packet of the ARP keepalive packet is received, the next hop address of the host route corresponding to the ARP entry is directed to the designated port, where the designated port is a port for implementing forwarding service traffic.
The method of claim 1, wherein the designated outlet is a designated port when the MAC address is a MAC address learned by the designated port, wherein the designated port is a port for implementing forwarding service traffic.
The method of claim 6, after the next hop address of the host route corresponding to the ARP entry is directed to the designated exit, the method further includes:

The packet routed by the host corresponding to the ARP entry and/or the message forwarded by the last hop of the ARP entry is forwarded by the designated port.
An apparatus for processing an address resolution protocol ARP entry includes:

The detecting module is configured to: detect a service interruption signal corresponding to the media access control MAC address;

An acquiring module, configured to: when detecting the service interruption signal, acquire an ARP entry corresponding to the MAC address;

The first pointing module is configured to: point the next hop address of the host route corresponding to the ARP entry to the designated exit.
The apparatus according to claim 8, wherein when the MAC address is a failed MAC address, the designated exit is a black hole exit, and wherein the black hole exit is an exit that cannot forward traffic.
The apparatus of claim 8 further comprising:

The discarding module is configured to: discard the packet routed by the host corresponding to the ARP entry and/or the packet forwarded by the last hop of the ARP entry.
The apparatus of claim 9 further comprising:

The sending module is configured to: send an ARP keep-alive message to the user side device;

The second directional module is configured to: when the response packet of the ARP keep-alive packet is not received, point the next hop address of the host route corresponding to the ARP entry to the black hole exit.
The apparatus of claim 9 further comprising:

The third directional module is configured to: when receiving the response message of the ARP keepalive message, point the next hop address of the host route corresponding to the ARP entry to the designated port, where the designated port is used The port that implements forwarding traffic.
The device according to claim 8, wherein the designated outlet is a designated port when the MAC address is a MAC address learned by the designated port, wherein the designated port is a port for implementing forwarding service traffic.
The apparatus of claim 13 further comprising:

a forwarding module, configured to: after the first directional module directs the next hop address of the host route corresponding to the ARP entry to the designated egress, the packet routed by the host corresponding to the ARP entry Or the message forwarded by the last hop of the ARP entry is forwarded by the designated port.