WO2016138747A1

WO2016138747A1 - Information synchronization method and apparatus

Info

Publication number: WO2016138747A1
Application number: PCT/CN2015/087952
Authority: WO
Inventors: 路凤敏; 马飞
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-03-04
Filing date: 2015-08-24
Publication date: 2016-09-09
Also published as: CN105991392A

Abstract

The present invention provides an information synchronization method and apparatus, the information synchronization method is used for a main bridge device and includes: resolving an address resolution protocol (ARP) message and generating first ARP resolution information; according to the first ARP resolution information, constructing a notification message corresponding to the first ARP resolution information; transmitting the notification message to a standby bridge device to enable the standby bridge device to resolve the received notification message and generate second ARP resolution information synchronously, and the second ARP resolution information is the same as the first ARP resolution information. By the present invention, the ARP resolution information generated on the main bridge device can be synchronized to the standby bridge device real-timely, and the function of double machine hot standby can be realized.

Description

Method and device for synchronizing information

Technical field

The present invention relates to the field of communications, and in particular, to a method and apparatus for synchronizing information in a bridge environment.

Background technique

At present, there are two types of virtual private network VPN services based on multi-protocol label switching MPLS technology, namely, a Layer 2 virtual private network L2VPN service and a Layer 3 virtual private network L3VPN service.

For the packet transport network PTN, in order to implement the L3VPN service, it is not required to support from the access aggregation layer. Only the L2VPN service can be supported at the access aggregation layer, and the L3VPN service can be supported at the core network layer. During the specific communication process, the core node needs to terminate the L2VPN service internally, and then bridges the L3VPN service to implement forwarding between the L2VPN service and the L3VPN service.

In a traditional bridging network, the main bridging device and the standby bridging device are generally included. When the main bridging device fails, the pseudowire fast rerouting PW FRR in the bridging environment and the virtual private network fast rerouting VPN FRR are switched, and the corresponding bridging is performed. The function is transferred to the standby bridge device. The ARP device needs to drive a large amount of traffic to obtain and parse ARP packets.

When the number of accessing base stations is large (and may reach thousands), the acquisition and resolution of a large number of ARP packets will increase the traffic overhead, and the traffic is limited. The time that caused some service interruptions reached more than 10s, causing some base stations to drop stations and affect the service.

Summary of the invention

It is an object of the present invention to provide a method and apparatus for synchronizing information, by synchronizing ARP parsing information generated on the main bridging device to the standby bridging device, so as to avoid completion of the bridging device when the main bridging device fails. The bridging function requires a large number of ARP packets to be processed.

In order to achieve the above object of the present invention, the present invention provides a method for information synchronization, which is used for a primary bridging device, including: parsing an address resolution protocol ARP packet to generate first ARP parsing information; The information is configured to construct a notification message corresponding to the first ARP parsing information, and send the notification message to the backup bridging device, so that the backup bridging device parses the received notification message, and generates a second synchronization The ARP parsing information is the same as the first ARP parsing information.

In the embodiment of the present invention, the notification message is a gratuitous ARP packet, and the configuration is related to the first ARP. The notification message corresponding to the parsing information includes: constructing a gratuitous ARP packet corresponding to the first ARP parsing information.

In the embodiment of the present invention, the sending the notification message to the backup bridging device includes: sending the notification message to the backup bridging device by using a channel pseudowire PW between the active and standby bridging devices.

In the embodiment of the present invention, the ARP packet includes an ARP packet whose destination physical MAC address is all Fs and an ARP packet whose destination MAC address is the gateway MAC address.

The present invention further provides an apparatus for synchronizing information, which is located in a primary bridging device, and includes: a first parsing module configured to parse an address resolution protocol ARP packet to generate first ARP parsing information; and a constructing module configured to The first ARP parsing information is configured to construct a notification message corresponding to the first ARP parsing information, and the sending module is configured to send the notification message to the backup bridging device, so that the backup bridging device receives the notification The packet is parsed, and the second ARP parsing information is generated synchronously, and the second ARP parsing information is the same as the first ARP parsing information.

In the embodiment of the present invention, the notification message is a gratuitous ARP packet, and the constructing module is configured to construct a gratuitous ARP packet corresponding to the first ARP parsing information.

In the embodiment of the present invention, the sending module is configured to send the notification message to the backup bridge device through the channel pseudowire PW between the primary and secondary bridge devices.

The invention further provides a method for synchronizing information, which is used for preparing a bridge device, comprising: receiving a notification message sent by a primary bridge device, wherein the notification message is obtained by the primary bridge device according to the ARP packet parsed by the host bridge device The first ARP parsing information is obtained, and the received ARP parsing information is parsed, and the second ARP parsing information is the same as the first ARP parsing information.

In the embodiment of the present invention, the notification message is a gratuitous ARP packet, and the notification message sent by the receiving host bridge device includes: receiving the gratuitous ARP packet sent by the primary bridging device.

In the embodiment of the present invention, the receiving the notification message sent by the primary bridging device includes: receiving, by the channel pseudowire PW between the primary and secondary bridge devices, the notification packet sent by the primary bridging device.

The present invention further provides an apparatus for synchronizing information, which is located in a backup bridging device, and includes: a receiving module, configured to receive a notification message sent by the main bridging device, wherein the notification message is that the main bridging device parses the ARP according to the The first ARP parsing information obtained by the message is constructed; the second parsing module is set to receive the received The notification message is parsed, and the second ARP parsing information is generated synchronously, and the second ARP parsing information is the same as the first ARP parsing information.

In the embodiment of the present invention, the notification packet is a gratuitous ARP packet, and the receiving module is configured to receive the gratuitous ARP packet sent by the primary bridging device.

In the embodiment of the present invention, the receiving module is configured to receive a notification message sent by the primary bridging device by using a channel pseudowire PW between the active and standby bridging devices.

With the above technical solution of the present invention, the present invention has the beneficial effects that the information synchronization method and apparatus of the present invention can be used in real time through the channel PW established between the primary and backup bridge devices. The ARP resolution information generated on the primary bridge device is synchronized to the backup bridge device to implement the dual-system hot backup function. When the primary bridge device fails, the backup bridge device needs to process a large number of ARP packets to complete the bridge function. The situation reduces the impact on the overall business and improves the protection switching performance.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a flow chart showing a method of information synchronization in an embodiment of the present invention.

FIG. 2 is a flowchart of processing the ARP packet with the destination MAC address being all Fs according to the present invention.

FIG. 3 is a flowchart of processing an ARP packet whose destination MAC address is a gateway MAC address according to the present invention.

FIG. 4 is a block diagram showing the structure of an apparatus for synchronizing information according to an embodiment of the present invention.

FIG. 5 is a flow chart showing a method of information synchronization according to another embodiment of the present invention.

FIG. 6 is a block diagram showing the structure of an apparatus for synchronizing information according to another embodiment of the present invention.

detailed description

The specific embodiments are described in detail below with reference to the accompanying drawings.

The embodiment of the invention provides a method for information synchronization, which can be applied to a primary bridge device. See Figure 1, A flowchart of a method for information synchronization according to an embodiment of the present invention includes the following steps:

Step S101: Parsing an address resolution protocol ARP packet to generate first ARP parsing information; the first ARP parsing information exists in the form of an ARP entry in the primary bridging device;

Step S102: Construct a notification message corresponding to the first ARP parsing information according to the first ARP parsing information;

Step S103: Send the notification message to the backup bridge device, and enable the backup bridge device to parse the received notification message, and generate second ARP parsing information, the second ARP parsing information and the first The ARP resolution information is the same; the second ARP resolution information exists in the form of an ARP entry in the backup bridge device.

In the embodiment of the present invention, the ARP resolution information generated on the primary bridging device is synchronized to the backup bridging device to implement the hot standby function, so as to prevent the bridging device from completing the bridging when the primary bridging device fails. The function requires a large number of ARP packet processing to reduce the impact on the overall service and improve protection switching performance.

In the embodiment of the present invention, in the embodiment of the present invention, the notification message is a gratuitous ARP packet, and the notification message corresponding to the first ARP parsing information is:

Constructing a gratuitous ARP packet corresponding to the first ARP parsing information.

In addition, the method for synchronizing information in the embodiment of the present invention can synchronize the ARP parsing information by establishing a channel pseudowire PW between the primary and secondary bridge devices. Specifically, the sending the notification message to the backup bridge device includes:

The notification message is sent to the backup bridge device through the channel pseudowire PW between the active and standby bridge devices.

It should be noted that, in the embodiment of the present invention, the channel PW is different from the service PW in the bridge network, the channel PW is established between the primary and backup bridge devices, and the service PW is generally bridged. Established between the device and the base station. Moreover, during the communication process, it is necessary to ensure that the channel PW is in an active state at all times.

In a practical application, the bridging device that implements the bridging function usually performs the conversion and forwarding of the L2VPN packet and the L3VPN packet by setting the bridging logical interface. The corresponding interfaces can be respectively called the Layer 2 logical interface and the Layer 3 logical interface. . The channel PW is bound to a three-layer logical interface corresponding to the active and standby bridge devices, and one channel PW can be shared between different three-layer logical interfaces. However, in the process of information synchronization, there is a traversal search process for the channel PW and the binding of the three-layer logical interface. Therefore, one channel PW cannot be bound to too many three-layer logical interfaces.

In addition, when there are many three-layer logical interfaces corresponding to the active and standby bridge devices, multiple channel PWs can be configured between the active and standby bridge devices to quickly synchronize ARP resolution information. However, in order to ensure the accuracy of the synchronization information, when multiple channel PWs are configured between the primary and secondary bridge devices, the multiple channels PW are isolated from each other to avoid A broadcast situation has occurred.

In a bridged environment, there are two types of ARP packets that need to be resolved for the primary or secondary bridge device (the primary and secondary bridge devices are opposite): ARP packets with the destination physical MAC address being all Fs. The text and destination MAC address are ARP packets of the gateway MAC address.

The following describes the processing of these two types of messages in detail.

As shown in Figure 2, the process of processing ARP packets with the destination MAC address being all Fs is as follows:

Step 201: The bridge device receives an ARP packet whose destination MAC address is all Fs.

Step 202: The bridge device CPU determines whether the destination IP address of the ARP packet is its own IP address.

Step 203: If yes, the bridge device is a primary bridge device, and the master bridge device parses the ARP packet to generate the first ARP parsing information.

Step 204: The master bridge device constructs a gratuitous ARP packet corresponding to the first ARP parsing information according to the first ARP parsing information.

Step 205: The primary bridging device sends the gratuitous ARP packet to the backup bridging device through the channel pseudowire PW between the active and standby bridging devices, so that the backup bridging device parses the received gratuitous ARP packet. And generating, by the second ARP parsing information, the second ARP parsing information is the same as the first ARP parsing information;

Step 206: If it is not its own IP address, the bridge device CPU continues to determine whether the destination IP address and its own IP address are in the same network segment;

Step 207: If the network segment is not in the same network segment, discard the ARP packet; if yes, determine whether the ARP packet is sent through the channel PW.

Step 208: If yes, the bridging device is a backup bridging device, and the standby bridging device parses the received ARP packet, and generates ARP parsing information synchronously; otherwise, discards the ARP packet.

Referring to FIG. 3, in the process of processing an ARP packet whose destination MAC address is a gateway MAC address, the ARP packet is that the primary bridge device sends an ARP request packet to the base station, so that the destination MAC address received is the gateway. The ARP reply packet of the MAC address, so the specific processing is as follows:

Step 301: The primary bridging device receives the ARP packet whose destination MAC address is the gateway MAC address.

Step 302: The primary bridge device CPU determines whether the destination IP address of the ARP packet is its own IP address.

Step 303: If yes, the primary bridging device parses the ARP packet to generate the first ARP parsing information; otherwise, discards the ARP packet;

Step 304: The master bridge device constructs a gratuitous ARP packet corresponding to the first ARP parsing information according to the first ARP parsing information.

Step 305: The primary bridging device sends the gratuitous ARP packet to the backup bridging device through the channel pseudowire PW between the active and standby bridging devices, so that the backup bridging device parses the received gratuitous ARP packet. The second ARP parsing information is generated synchronously, and the second ARP parsing information is the same as the first ARP parsing information, and the process of synchronizing the ARP parsing information of the active and standby bridging devices is completed.

Corresponding to the method for synchronizing information shown in FIG. 1 , an embodiment of the present invention further provides an apparatus for synchronizing information, which is located in a main bridging device, and is configured to perform the method for synchronizing the information. Referring to FIG. 4, the device for synchronizing information includes:

The first parsing module 41 is configured to parse the address resolution protocol ARP packet to generate first ARP parsing information;

The constructing module 42 is configured to construct a notification message corresponding to the first ARP parsing information according to the first ARP parsing information;

The sending module 43 is configured to send the notification message to the backup bridge device, so that the backup bridge device parses the received notification message, and generates second ARP parsing information, the second ARP parsing information. Same as the first ARP parsing information.

In the process of synchronizing information by using the information synchronization device shown in FIG. 2, by synchronizing the ARP resolution information generated on the primary bridge device to the backup bridge device, the effect of hot standby is achieved, and the overall The impact of the business.

In the embodiment of the present invention, in the embodiment of the present invention, the notification message is a gratuitous ARP packet, and the constructing module is configured to construct a gratuitous ARP packet corresponding to the first ARP parsing information.

The information synchronization device of the embodiment of the present invention can synchronize the ARP resolution information by establishing a channel pseudowire PW between the primary and secondary bridge devices. Specifically, the sending module is configured to send the notification message to the backup bridge device by using a channel pseudowire PW between the primary and secondary bridge devices.

In a practical application, the channel PW is bound to a three-layer logical interface corresponding to the primary and secondary bridge devices, and a channel PW can be shared between different three-layer logical interfaces. However, in the process of information synchronization, there is a traversal search process for the channel PW and the binding of the three-layer logical interface. Therefore, one channel PW cannot be bound to too many three-layer logical interfaces.

In addition, when there are many three-layer logical interfaces corresponding to the active and standby bridge devices, multiple channel PWs can be configured between the active and standby bridge devices to quickly synchronize ARP resolution information. However, in order to ensure the accuracy of the synchronization information, when multiple channel PWs are configured between the primary and secondary bridge devices, the multiple channels PW are isolated from each other.

Similarly, in a bridged environment, there are two types of ARP packets that need to be resolved for the primary or secondary bridge device. The ARP packets with the destination physical MAC address being all Fs and the destination MAC address are ARP packet of the gateway MAC address.

The invention also provides a method for information synchronization, which can be applied to a backup bridge device. Referring to FIG. 5, a flowchart of a method for synchronizing information according to another embodiment of the present invention includes the following steps:

Step 501: Receive a notification packet sent by the primary bridging device, where the notification packet is constructed by the primary bridge device according to the first ARP parsing information obtained by the primary bridging device.

Step 502: Parse the received notification message, and generate second ARP parsing information synchronously, where the second ARP parsing information is the same as the first ARP parsing information.

In the information synchronization method shown in FIG. 5, by synchronizing the ARP resolution information generated on the primary bridge device to the backup bridge device, the effect of hot standby is achieved, and when the primary bridge device fails, the backup bridge device is When the bridging function is completed, a large number of ARP packets are processed, which reduces the impact on the overall service and improves the protection switching performance.

In the embodiment of the present invention, in the embodiment of the present invention, the notification message is a gratuitous ARP packet, and the notification message is a gratuitous ARP packet, and the notification message sent by the receiving host bridge device includes:

Receives gratuitous ARP packets sent by the master bridge device.

In addition, the method for synchronizing information in the embodiment of the present invention can synchronize the ARP parsing information by establishing a channel pseudowire PW between the primary and secondary bridge devices. Specifically, the receiving the notification message sent by the primary bridging device includes:

The notification message sent by the primary bridge device is received by the channel pseudowire PW between the active and standby bridge devices.

In the bridge environment, there are two types of ARP packets that need to be resolved for the primary or secondary bridge device (the primary and secondary bridge devices are opposite): ARP with the destination physical MAC address being all F The packet and destination MAC address are ARP packets of the gateway MAC address.

Corresponding to the method for synchronizing the information shown in FIG. 5, the embodiment of the present invention further provides an apparatus for synchronizing information, which is located in a backup bridging device, and is used for performing the method for synchronizing information shown in FIG. 5. Referring to FIG. 6, the device for synchronizing information includes:

The receiving module 61 is configured to receive the notification message sent by the primary bridging device, where the notification packet is configured by the primary bridging device according to the first ARP parsing information obtained by the primary bridging device.

The second parsing module 62 is configured to parse the received notification packet, and generate second ARP parsing information synchronously, where the second ARP parsing information is the same as the first ARP parsing information.

The information synchronization device of the embodiment of the present invention can synchronize the ARP resolution information by establishing a channel pseudowire PW between the primary and secondary bridge devices. Specifically, the receiving module is configured to receive, by using a channel pseudowire PW between the primary and secondary bridge devices, a notification message sent by the primary bridging device.

In the process of synchronizing information using the information synchronization device shown in FIG. 6, there are two types of address resolution protocol ARP packets to be parsed: ARP packets with a destination physical MAC address of all Fs and a destination MAC address. ARP packet whose MAC address is the gateway.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Industrial applicability

Based on the foregoing technical solution provided by the embodiment of the present invention, the channel PW established between the primary and secondary bridge devices can synchronize the ARP resolution information generated on the primary bridge device to the backup bridge device in real time to implement dual hotspots. The backup function prevents the backup bridge device from performing a large number of ARP packet processing when the bridge function is completed. This reduces the impact on the overall service and improves the protection switching performance.

Claims

A method of information synchronization for a host bridge device, including:

Parsing the ARP packet of the address resolution protocol to generate the first ARP parsing information;

Constructing, according to the first ARP parsing information, a notification message corresponding to the first ARP parsing information;

Sending the notification message to the backup bridge device, causing the backup bridge device to parse the received notification message, and synchronously generate second ARP parsing information, the second ARP parsing information and the first ARP parsing information. the same.
The method for synchronizing information according to claim 1, wherein the notification message is a gratuitous ARP packet, and the notification message corresponding to the first ARP parsing information is:

Constructing a gratuitous ARP packet corresponding to the first ARP parsing information.
The method of information synchronization according to claim 1, wherein the sending the notification message to the backup bridge device comprises:

The notification message is sent to the backup bridge device through the channel pseudowire PW between the active and standby bridge devices.
The method for synchronizing information according to claim 1, wherein the ARP packet includes an ARP packet whose destination physical MAC address is all Fs and an ARP packet whose destination MAC address is a gateway MAC address.
A device for synchronizing information, located in a host bridge device, comprising:

The first parsing module is configured to parse the address resolution protocol ARP packet to generate the first ARP parsing information;

The constructing module is configured to construct a notification message corresponding to the first ARP parsing information according to the first ARP parsing information;

The sending module is configured to send the notification message to the backup bridging device, so that the backup bridging device parses the received notification packet, and synchronously generates second ARP parsing information, where the second ARP parsing information is The first ARP parsing information is the same.
The device for synchronizing information according to claim 5, wherein the notification message is a gratuitous ARP packet, and the constructing module is configured to construct a gratuitous ARP packet corresponding to the first ARP parsing information.
The device for information synchronization according to claim 5, wherein the sending module is configured to send the notification message to the backup bridge device through a channel pseudowire PW between the primary and secondary bridge devices.
The apparatus for information synchronization according to claim 5, wherein the ARP packet includes a destination physical MAC The ARP packet whose address is all Fs and the ARP packet whose destination MAC address is the gateway MAC address.
A method for synchronizing information for preparing a bridge device, including:

Receiving, by the primary bridging device, the notification packet sent by the primary bridging device, where the notification packet is configured by the primary bridging device according to the first ARP parsing information obtained by the primary bridging device;

The received ARP parsing information is parsed, and the second ARP parsing information is generated in synchronization with the first ARP parsing information.
The method of information synchronization according to claim 9, wherein the notification message is a gratuitous ARP message, and the notification message sent by the receiving host bridge device comprises:

Receives gratuitous ARP packets sent by the master bridge device.
The method of information synchronization according to claim 9, wherein the receiving the notification message sent by the primary bridge device comprises:

The notification message sent by the primary bridge device is received by the channel pseudowire PW between the active and standby bridge devices.
The method of information synchronization according to claim 9, wherein the ARP packet includes an ARP packet whose destination physical MAC address is all Fs and an ARP packet whose destination MAC address is a gateway MAC address.
A device for synchronizing information, located in a backup bridge device, comprising:

The receiving module is configured to receive the notification message sent by the primary bridging device, where the notification packet is configured by the primary bridging device according to the first ARP parsing information obtained by the primary bridging device.

The second parsing module is configured to parse the received notification packet, and generate second ARP parsing information synchronously, where the second ARP parsing information is the same as the first ARP parsing information.
The device for synchronizing information according to claim 13, wherein the notification message is a gratuitous ARP message, and the receiving module is configured to receive a gratuitous ARP message sent by the main bridge device.
The device for information synchronization according to claim 13, wherein the receiving module is configured to receive a notification message sent by the primary bridge device through a channel pseudowire PW between the primary and secondary bridge devices.
The device for synchronizing information according to claim 13, wherein the ARP packet includes an ARP packet whose destination physical MAC address is all Fs and an ARP packet whose destination MAC address is a gateway MAC address.