WO2017143969A1

WO2017143969A1 - Method, router, and network processor for controlling port status

Info

Publication number: WO2017143969A1
Application number: PCT/CN2017/074281
Authority: WO
Inventors: 张夏; 陈慧斌
Original assignee: 华为技术有限公司
Priority date: 2016-02-26
Filing date: 2017-02-21
Publication date: 2017-08-31
Also published as: CN105610740A; CN105610740B

Abstract

The present application relates to the technical field of wireless communication, and more specifically relates to a method and a router for controlling a status of a port. The invention addresses an issue of complexity for removing a closed status of a detached device. The application provides a method for controlling a status of a port. The method comprises: a first port under a closed status of a first device receiving an instruction packet sent by a second port of a second device, the first port sending the instruction packet to a network processor (NP) of the first device; the NP determining whether the instruction packet is a packet instructing a removal of a closed status of a port; if so, then sending the instruction packet to a CPU of the first device; and the CPU receiving the instruction packet sent from the NP and then instructing a removal of the closed status of the first port. The method controls a status of a port by sending an instruction packet, and can remotely perform an operation to remove a closed status of a device port without requiring an operator to access a machine room housing the device to perform the operation, simplifying the operation and saving labor and time.

Description

Method for controlling port state, routing device and network processor

This application claims the priority of the Chinese Patent Application filed on February 26, 2016, the Chinese Patent Office, the application number is 201610109801.0, and the invention is entitled "A method for controlling the state of the port, routing device and network processor". This is incorporated herein by reference.

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a method for controlling a port state, a routing device, and a network processor. The present application relates to the field of communications, and in particular, to a packet transmission method and apparatus.

Background technique

In the scenario of massive delivery of the Internet Protocol Radio Bearer Network (IPRAN), a large number of devices in the network need to be commissioned. For a chained network that uses an inband network management system, if the shutdown operation is performed on the ports of some devices during the commissioning process, the devices may lose connectivity with the network management device and cause disconnection.

As shown in FIG. 1 , in the IPRAN, a radio base station to a radio network controller (RNC) passes through a multi-layer link, and includes a link (Last Mile) and a slave link from the radio base station to the box router. A box router connected to a wireless base station arrives at a link of a frame router, aggregates a large number of frame routers to a link of a small number of frame routers, and connects a small number of frame routers to a link of the RNC (Core) . Among them, the frame router itself has many interconnected links. Even if the port shutdown occurs, it will not cause disconnection, and the box routers near the user side have fewer interconnect links. If the port is shut down, It is easy to cause the pipe to go off. For example, in Figure 1, if port 1 on the A device is shut down, the A device can still connect to the network management device through other ports, so it will not cause disconnection. However, if port 2 on the B device is shut down, the connection between the B device and the network management device will be lost, resulting in disconnection. After the disconnection occurs, you can only enter the equipment room where the B device is located. Connect the B device through the serial cable to perform the undo shutdown operation.

It can be seen that after the device in the IPRAN is out of the pipe, the device can only enter the machine room where the device is located to perform the undo shutdown operation. The operation is complicated and it takes a lot of manpower and time.

Summary of the invention

The embodiment of the present invention provides a method and a device for controlling the state of a port, which are used to solve the problem that the device in the IPRAN is disconnected from the device in the equipment room where the device is located, and the operation is complicated. It will cost a lot of manpower and time.

An embodiment of the present application provides a method for controlling a state of a port, including:

The first port in the closed state of the first device receives the indication packet sent by the second port of the second device, where the first port in the closed state can only receive the packet, and cannot send the packet to the second device.

The first port sends the indication message to the network processor NP in the first device; the NP judgment in the first device Whether the indication message is a message indicating that the port is closed, and if yes, transmitting the indication message to the central processing unit CPU in the first device;

After receiving the indication message of the NP transmission, the CPU in the first device instructs the first port to release the shutdown state.

The foregoing method implements port state control by sending an indication message, and can remotely release the shutdown state of the device port without requiring the worker to enter the equipment room where the device is located, thereby simplifying the operation and saving manpower and time. The method is applied in the IPRAN commissioning phase, which can improve the fault tolerance of the IPRAN commissioning phase and shorten the delivery cycle in the mass delivery scenario.

In the above method, the NP in the first device determines whether the indication packet is a packet indicating that the port is disabled, and if the indication packet is not a packet indicating that the port is disabled, the device may discard the packet. Indicate the message.

In the foregoing method, the specific process that the first port sends the indication packet to the NP in the first device may be:

The first port transmits the indication message to the child card in the first device; the child card in the first device transmits the indication message to the NP.

In the above method, after receiving the indication message through the first port, the first device does not block the indication message at the sub-card level, but continues to transmit it to the NP, and the NP performs the indication message. Parsing, judging whether it is a message indicating that the port is closed, if not, blocking it and not transmitting it to the CPU, thus reducing the processing load of the CPU, which is equivalent to realizing the shutdown of the first port. . If the NP determines that the indication message is a message indicating that the port is disabled, and then submits the message to the CPU for processing, that is, the CPU instructs the first port to be in the off state. In this way, the port status can be remotely controlled to facilitate IPRAN commissioning.

Another embodiment of the present application provides a method for controlling a state of a port, including:

After receiving the instruction to release the closed state of the first port of the first device, the central processing unit CPU in the second device transmits the generated indication message to the second port; wherein the first port is in the closed state A packet can be received only, and the packet cannot be sent to the second device. The indication packet is a packet indicating that the port is disabled.

The second port of the second device sends an indication message to the first port of the first device.

In the above method, the second device controls the port state of the first device by sending the indication message, and the worker does not need to enter the equipment room where the first device is located to perform the port shutdown state release operation, thereby simplifying the operation and saving manpower and time.

In the above method, the CPU in the second device transmits the generated indication message to the second port. Specifically, the CPU may receive the shutdown status of the first port of the first device that is sent by the network management device. After the instruction, the generated indication message is transmitted to the second port.

The embodiment of the present application provides a routing device, including:

a first port, configured to receive the indication message sent by the second port of the second device in the off state, and send the indication message to the network processor NP; wherein the first port is in a closed state and cannot be sent to another port Sending a packet; the first port in the closed state can only receive a packet, and cannot send a packet to the second device;

The NP is configured to determine whether the indication message is a message indicating that the port is disabled, and if yes, transmitting the indication message to the central processing unit CPU;

The CPU is configured to: after receiving the indication message of the NP transmission, instructing the first port to be in an off state.

The routing device can implement the port state control by receiving the indication packet, and does not require the staff to enter the equipment room where the device is located, thereby simplifying the operation and saving manpower and time. The application in the IPRAN commissioning phase can improve the fault tolerance of the IPRAN commissioning phase and shorten the delivery cycle in the mass delivery scenario.

The routing device determines whether the indication packet is a packet indicating that the port is disabled. If the indication packet is not a packet indicating that the port is disabled, the indication packet is discarded.

The routing device may further include a sub-card, and the first port sends the indication message to the NP by using the sub-card. Specifically, the first port transmits the indication message to the sub-card, and the sub-card receives the indication report transmitted by the first port. And transmitting the indication message to the NP.

In the routing device, after receiving the indication packet, the routing device does not block the indication packet at the sub-card level, but continues to transmit the indication packet to the NP, and the NP reports the indication. The text is parsed to determine whether it is a message indicating that the port is closed. If not, it is blocked and not transmitted to the CPU. Thus, the processing load of the CPU is reduced, which is equivalent to realizing the first port. Close up. If the NP determines that the indication message is a message indicating that the port is disabled, and then submits the message to the CPU for processing, that is, the CPU instructs the first port to be in the off state. With this design, the port status can be remotely controlled for IPRAN commissioning.

The embodiment of the present application provides a routing device, including:

The central processing unit CPU is configured to: after receiving the instruction to release the closed state of the first port of the first device, transmit the generated indication message to the second port; wherein the first port in the closed state can only Receiving the packet, the packet cannot be sent to the second device; the indication packet is a packet indicating that the port is disabled.

And a second port, configured to send the indication message to the first port of the first device.

The routing device can control the port state of the first device by sending the indication packet, and the worker does not need to enter the equipment room where the first device is located to perform the port shutdown state release operation, thereby simplifying the operation and saving manpower and time.

In the above routing device, the instruction of the CPU to release the shutdown state of the first port of the first device may be delivered by the network management device, that is, the CPU releases the first device after receiving the network management device. After the instruction of the first port is closed, the generated indication message is transmitted to the second port.

The embodiment of the present application further provides a network processor NP, including:

a receiving module, configured to receive an indication message transmitted by the first port of the routing device;

a processing module, configured to determine whether the indication message is a message indicating that the port is disabled, and if yes, transmitting the indication message to a central processing unit CPU in the routing device, where the CPU indicates The first port is released from the closed state, otherwise, the indication message is discarded.

The above NP adds a function of analyzing and determining the received message. After receiving the indication packet on the first port in the closed state, the routing device does not block the packet at the sub-card level, but continues to transmit it to the NP. The NP analyzes the indication packet and determines Whether it is a message indicating that the port is closed, if not, it is blocked and is not transmitted to the CPU. Thus, the processing load of the CPU is reduced, which is equivalent to the closing of the first port. If the NP determines that the indication message is a message indicating that the port is disabled, and then submits the message to the CPU for processing, that is, the CPU instructs the first port to be in the off state. In this way, Remote control of the port status facilitates IPRAN commissioning.

DRAWINGS

1 is a schematic structural diagram of an IPRAN network;

2 is a schematic diagram of a port state remote control system 20 according to an embodiment of the present application;

FIG. 3 is a flowchart of a method for controlling a state of a port according to an embodiment of the present disclosure;

4 is a schematic diagram of sending a message from Port A of R1 to Port B of R2;

FIG. 5 is a schematic diagram of sending and processing a message according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a routing device 50 according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a routing device 60 according to another embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of an NP 70 according to an embodiment of the present application.

detailed description

As shown in FIG. 2, it is a schematic diagram of a port state remote control system 20 according to an embodiment of the present application. The first device 21 includes components such as a first port 210, a daughter card 211, an NP 212, and a CPU 213, and the second device 22 includes components such as a second port 220, a daughter card 221, an NP 222, and a CPU 223. After receiving the instruction to release the closed state of the first port 210 of the first device 21, the CPU 223 in the second device 22 transmits the generated indication message to the second port 220; the second port 220 transmits the indication message. The first port 210 is sent to the first port 210 of the first device 21; the first port 210 receives the indication message sent by the second port 220, and sends the indication message to the NP 212; the NP 212 determines whether the indication message is to indicate that the port is disabled. The message, if yes, transmits the indication message to the CPU 213, and the CPU 213 instructs the first port to be in the off state. If not, the instruction message can be discarded.

The embodiment of the present application implements control of the port state by sending a packet indicating that the port is closed in the closed state. In this mode, the device port in the closed state cannot send packets but can receive packets. After receiving the packet, the device port does not block the received packet at the sub-card layer, but transmits the packet to the network processor (NP). The NP resolves whether the packet is legal. After determining that the received packet is valid (that is, the agreed message indicating that the port is closed), the NP transmits the packet to the CPU for subsequent processing (that is, the first port is released from the port shutdown state). If the NP determines that the received packet is invalid, the packet can be directly discarded and not transmitted to the CPU. In this way, when the device port is in the closed state, it can still receive and respond to the message indicating that the port is disabled. For other packets, the packet can be blocked at the NP level.

The embodiments of the present application are further described in detail below with reference to the accompanying drawings.

As shown in FIG. 3, a flowchart of a method for controlling a port state according to an embodiment of the present application includes the following steps:

S301: The central processing unit (CPU) in the second device transmits the generated indication message to the second port after receiving the instruction to release the closed state of the first port of the first device; The first port in the closed state can only receive packets and cannot send packets to the second device. The indication packet is a packet indicating that the port is disabled.

In a specific implementation, the user may directly send a command to cancel the closed state of the first port of the first device in the second device, for example, executing a command in the second port view of the second device, to the first device Under the port Issue a command to release the shutdown state. Alternatively, the second device may receive a command sent by the network management device to release the closed state of the first port of the first device. Then, the CPU responds to the command directly sent by the user or the command sent by the network management device, and removes the packet format of the port off state based on the predefined indication, generates the indication message, and transmits the indication message to the second. port.

Here, the packet format indicating that the port is closed can be set by the device manufacturer, or can be uniformly set by the network administrator and sent to each device in the network through the network management device.

S302: The second port of the second device sends the generated indication message to the first port of the first device.

As shown in FIG. 4, the port A of the device R1 and the port B of the device R2 are directly connected through the physical link, and the port B of the R2 is shut down. The shutdown here is a software-implemented shutdown. At this time, Port B turns off the illumination, and the packet can not be sent again, but the packet can still be received, and the received packet is not directly blocked at the sub-card level, but is further transmitted to the NP. For details, see S303, R1. Port A is illuminated. In this application, Port A sends a message to Port B indicating that the port is disabled. Here, R1 may be a core aggregation layer device in the IPRAN. As shown in the Aggregation layer of FIG. 1, the core aggregation layer device itself has many interconnection links, and even if the port is closed, it generally does not cause disconnection. R2 can be a box device close to the user side, such as the device in the Access layer in Figure 1, which has fewer interconnect links, and if the port is closed, it tends to cause disconnection. R1 and R2 may also be box devices close to the user side, such as device B and device C in FIG. 1, respectively. If the device B is not disconnected, the device B can send the indication packet to the device C directly. If the device B is also out of the device, the device A can send the indication packet to the device B through the device A in the Aggregation layer to release the device B. After the port is closed, device B sends an indication packet to device C to release the port shutdown status of device C.

S303: The first port in the closed state of the first device receives the indication packet sent by the second port of the second device, and sends the indication message to the NP in the first device.

In a specific implementation, after receiving the indication message, the first port transmits the indication message to the sub-card, that is, a Peripheral Interface Controller (PIC). The present invention does not directly block the received indication message at the sub-card layer, but sets the forwarding engine on the NP. The forwarding engine determines the validity of the packet and blocks the invalid packet. In the embodiment of the present application, the legal packet is a packet indicating that the port is disabled, and the other packet is regarded as an invalid packet.

In the specific implementation, in order to reduce security risks and prevent malicious packets from being attacked, the user may choose to perform the above-mentioned non-sub-card layer blocking of packets only during the network commissioning phase (such as the IPRAN commissioning phase). The process of transmitting the packet to the NP for parsing does not perform the above steps when the commissioning ends and enters the stable operation phase. If the device port is in the closed state, the received packet is directly blocked at the sub-card layer.

S304: The NP in the first device determines whether the indication message is a message indicating that the port is disabled. If yes, the process proceeds to S305. Otherwise, the process proceeds to S306.

S305: The NP transmits the indication message to the CPU in the first device, and proceeds to S307.

S306: The NP discards the packet.

In a specific implementation, after determining that the indication message is valid (that is, the received message is a message indicating that the port is disabled), the NP sends the packet to the software layer for processing (that is, it is processed by the CPU). If the NP in the first device determines that the received indication packet is not a packet indicating that the port is disabled, the packet may be directly discarded.

In the embodiment of the present application, the NP can strictly control the packets sent to the CPU to prevent the CPU from being over-utilized due to malicious attacks and affect other processes.

S307: After receiving the indication message of the NP transmission, the CPU in the first device instructs the first port to release the port shutdown state.

Here, the CPU sends an instruction to the first port at the software layer, instructing the first port to perform an operation of releasing the undo shutdown state.

As shown in Figure 5, Port B of R2 is shut down, the CPU of R1 receives the command to release the closed state of Port B, and the CPU of R1 transmits the message indicating that the port is closed to Port A, which is sent by Port A of R1. Give Port B to R2. After receiving the packet, Port B transmits it to the NP of R2 through the PIC of R2. The NP of R2 determines whether the packet is a preset message indicating that the port is disabled. If yes, it transmits it to R2. The CPU parses the packet, and after confirming that the packet is a preset message indicating that the port is disabled, the port B sends an instruction to release the port closed state, and the port B releases the port closed state.

In the network scenario where the IPRAN is in the network of the network and the in-band network management is used, the port in the device can be used when the port is disabled due to human error and cannot be connected to the network management device through other ports. Applying the method of sending a packet in the embodiment to restore the device port to the enabled state. Specifically, after receiving the indication message through the first port, the first device does not block the indication message at the sub-card level, but continues to transmit it to the NP, and the NP analyzes the indication message to determine Whether it is a message indicating that the port is closed, if not, it is blocked and is not transmitted to the CPU. Thus, the processing load of the CPU is reduced, and the first port is closed. If the NP determines that the indication message is a message indicating that the port is disabled, and then submits the message to the CPU for processing, that is, the CPU instructs the first port to be in the off state. With the embodiment of the present application, the shutdown state of the device port can be remotely removed without the need for the worker to enter the equipment room where the device is located, which simplifies the operation, saves manpower and time, improves the fault tolerance of the IPRAN commissioning phase, and shortens the mass delivery scenario. The delivery cycle.

Based on the same inventive concept, the embodiment of the present application further provides a routing device and a network processor NP corresponding to the foregoing method for controlling a port state. The routing device and the principle of the NP solution and the state of the foregoing control port are provided by the embodiment of the present application. The method is similar, so the implementation of the routing device and the NP can be referred to the implementation of the method, and the details are not repeated here.

FIG. 6 is a schematic structural diagram of a routing device 60 according to an embodiment of the present disclosure, including:

The first port 61 is configured to receive the indication message sent by the second port of the second device in the off state, and send the indication message to the network processor NP; wherein the first port is in a closed state and cannot be sent to the other port The port sends a packet, where the first port in the closed state can only receive the packet, and cannot send the packet to the second device.

The NP 62 is configured to receive the indication message that is transmitted by the first port, and determine whether the indication message is a message indicating that the port is disabled, and if yes, transmitting the indication message to the central processing unit CPU;

The CPU 63 is configured to instruct the first port to release the port closed state after receiving the indication message of the NP transmission.

Optionally, the NP 62 is further used to:

If it is determined that the indication message is not a message indicating that the port is disabled, the indication message is discarded.

Optionally, the first port 61 is specifically configured to:

Transmitting the indication message to the subcard, to transmit the indication message to the NP 62 by using the subcard;

The device further includes:

The subcard 64 is configured to receive the indication message transmitted by the first port, and transmit the indication message to the NP 62.

FIG. 7 is a schematic structural diagram of a routing device 70 according to another embodiment of the present disclosure, including:

The central processing unit CPU 71 is configured to: after receiving the instruction to release the closed state of the first port of the first device, transmit the generated indication message to the second port 72; wherein the first port is in the closed state The packet can only be received, and the packet cannot be sent to the second device; the indication packet is a packet indicating that the port is disabled.

The second port 72 is configured to send the indication message to the first port of the first device.

Optionally, the CPU 71 is specifically configured to:

After receiving the instruction of the network management device to release the closed state of the first port of the first device, the generated indication message is transmitted to the second port 72.

FIG. 8 is a schematic structural diagram of a network processor NP 80 in a routing device (corresponding to the first device) according to an embodiment of the present disclosure, including:

The receiving module 81 is configured to receive an indication message that is transmitted by the first port of the routing device.

The processing module 82 is configured to determine whether the indication message is a message indicating that the port is disabled, and if yes, transmitting the indication message to a central processing unit CPU in the routing device, where indicated by the CPU The first port is released from the closed state, otherwise, the indication message is discarded.

The above NP adds a function of analyzing and determining the received message. After receiving the indication packet on the first port in the closed state, the routing device does not block the packet at the sub-card level, but continues to transmit it to the NP. The NP analyzes the indication packet and determines Whether it is a message indicating that the port is closed, if not, it is blocked and is not transmitted to the CPU. Thus, the processing load of the CPU is reduced, which is equivalent to the closing of the first port. If the NP determines that the indication message is a message indicating that the port is disabled, and then submits the message to the CPU for processing, that is, the CPU instructs the first port to be in the off state. In this way, the port status can be remotely controlled to facilitate IPRAN commissioning.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program Order product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the present application has been described, it will be apparent that those skilled in the art can make further changes and modifications to the embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

A method for controlling a state of a port, the method comprising:

The first port in the closed state of the first device receives the indication packet sent by the second port of the second device, where the first port in the closed state can only receive the packet, and cannot send the packet to the second port. The device sends a message;

The first port sends the indication message to the network processor NP in the first device, and the NP in the first device determines whether the indication message is a message indicating that the port is disabled. If yes, transmitting the indication message to a central processing unit CPU in the first device;

After receiving the indication message of the NP transmission, the CPU in the first device instructs the first port to release the shutdown state.
The method of claim 1 wherein the method further comprises:

If the NP in the first device determines that the indication message is not a message indicating that the port is disabled, the instruction packet is discarded.
The method according to claim 1 or 2, wherein the sending, by the first port, the indication message to the NP in the first device comprises:

Transmitting, by the first port, the indication message to a child card in the first device;

The daughter card in the first device transmits the indication message to the NP.
A method for controlling a state of a port, the method comprising:

After receiving the instruction to release the closed state of the first port of the first device, the central processing unit CPU in the second device transmits the generated indication message to the second port; wherein the first port is in the closed state The packet can only be received, and the packet cannot be sent to the second device; the indication packet is a packet indicating that the port is disabled.

The second port of the second device sends the indication message to the first port of the first device.
The method of claim 4, wherein the CPU in the second device transmits the generated indication message to the second port, including:

After receiving the instruction of the network management device to release the closed state of the first port of the first device, the CPU transmits the generated indication message to the second port.
A routing device, the device comprising:

a first port, configured to receive the indication message sent by the second port of the second device in the off state, and send the indication message to the network processor NP; wherein the first port is in a closed state and cannot be sent to another port Sending a packet; the first port in the closed state can only receive a packet, and cannot send a packet to the second device;

The NP is configured to receive the indication packet that is sent by the first port, determine whether the indication packet is a packet indicating that the port is disabled, and if yes, transmit the indication packet to a central processing unit CPU ;

The CPU is configured to: after receiving the indication message of the NP transmission, instructing the first port to be in an off state.
The device of claim 6 wherein said NP is further for:

If it is determined that the indication message is not a message indicating that the port is disabled, the indication message is discarded.
The device according to claim 6, wherein the first port is specifically configured to:

Transmitting the indication message to the child card;

The device further includes:

And the sub-card is configured to receive the indication message transmitted by the first port, and transmit the indication message to the NP.
A routing device, the device comprising:

The central processing unit CPU is configured to: after receiving the instruction to release the closed state of the first port of the first device, transmit the generated indication message to the second port; wherein the first port in the closed state can only Receiving the packet, the packet cannot be sent to the second device; the indication packet is a packet indicating that the port is disabled.

And a second port, configured to send the indication message to the first port of the first device.
The device according to claim 9, wherein the CPU is specifically configured to:

After receiving the instruction sent by the network management device to release the closed state of the first port of the first device, the generated indication message is transmitted to the second port.
A network processor NP, characterized in that the NP comprises:

a receiving module, configured to receive an indication message transmitted by the first port of the routing device;

a processing module, configured to determine whether the indication message is a message indicating that the port is disabled, and if yes, transmitting the indication message to a central processing unit CPU in the routing device, where the CPU indicates The first port is released from the closed state, otherwise, the indication message is discarded.