CN110784410A - Route establishing method and related equipment - Google Patents
Route establishing method and related equipment Download PDFInfo
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- CN110784410A CN110784410A CN201810855368.4A CN201810855368A CN110784410A CN 110784410 A CN110784410 A CN 110784410A CN 201810855368 A CN201810855368 A CN 201810855368A CN 110784410 A CN110784410 A CN 110784410A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/54—Organization of routing tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/10—Routing in connection-oriented networks, e.g. X.25 or ATM
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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Abstract
The embodiment of the application discloses a route establishing method and related equipment, which comprises the following steps: when detecting that the neighbor relation with the second equipment needs to be reestablished, the first equipment acquires the maintenance time carried in the Hello message; in the maintenance time, keeping the first routing table information generated in advance, and generating second routing table information according to the routing information reissued by the second equipment; when the maintenance time is over, when the first routing table information is determined to be the same as the second routing table information, the routing connection between the first device and the second device is maintained.
Description
Technical Field
The present application relates to the field of network technologies, and in particular, to a method for establishing a route and a related device.
Background
The Border Gateway Protocol (BGP) implements route diffusion by establishing a neighbor relationship and synchronizing route information between two devices having the neighbor relationship, each device generates corresponding route table information, and after receiving a data packet, each device forwards the data packet according to the route table information. If the routing neighbor changes, the routing is recalculated after the routing published by the neighbor is cancelled.
However, for two devices that have established BGP neighbors, if the neighbor protocol parameters, such as the timing time (Hello Timer), timeout times (timeout), etc., need to be adjusted, the established neighbor relationship is interrupted, and then the neighbor relationship is re-established, which may cause the route of each device to recover after a single oscillation, resulting in route interruption and affecting the normal forwarding of service data.
Disclosure of Invention
The embodiment of the application provides a route establishing method and related equipment, which can reduce route interruption time and ensure normal forwarding of service data when modifying protocol parameters to reestablish neighbors.
In a first aspect, an embodiment of the present application provides a method for establishing a route, including: the method comprises the steps that first equipment obtains the maintaining time carried in a Hello message when detecting that the neighbor relation needs to be reestablished with second equipment; then, in the maintenance time, keeping the pre-generated first routing table information and generating second routing table information according to the routing information reissued by the second equipment; and finally, when the waiting maintenance time is over, when the first routing table information is determined to be the same as the second routing table information, the routing connection between the first equipment and the second equipment is kept, so that when the protocol parameters are modified to reestablish the neighbor, the routing interruption time can be reduced, and the normal forwarding of service data is ensured.
In one possible design, the holding time is greater than the sum of the time required for the first device to modify the protocol parameter and the time required for the second device to modify the protocol parameter, so that the first device and the second device can both reestablish the complete neighbor relation within the holding time.
In another possible design, the Hello packet includes a timing time; when detecting that a neighbor relation needs to be reestablished with a second device, the first device obtains a waiting time for receiving a Hello message sent by the second device before obtaining a maintaining time carried by the Hello message; and when the waiting time length exceeds the timing time, determining to reestablish the neighbor relation with the second equipment.
In another possible design, the Hello packet further includes a timeout number; and when the number of times of not receiving the Hello message sent by the second equipment exceeds the overtime number, the first equipment determines to reestablish the neighbor relation with the second equipment.
In another possible design, the first device modifies the protocol parameters to re-establish the neighbor relation with the second device during the maintenance time.
In another possible design, the first device and the second device have re-established the neighbor relation and the routing information synchronization is completed when the waiting maintenance time is over.
In another possible design, when the waiting maintenance time is over, when it is determined that the first routing table information is different from the second routing table information, it indicates that the routing information is changed, the second routing table information is used to replace the first routing table information, the changed routing information is updated, the routing connection between the first device and the second device is reestablished, and only the changed part of routing convergence is affected.
In another possible design, before the first device and the second device reestablish the neighbor relationship, the first device and the second device may generate a Hello packet mutually, where the Hello packet carries the holding time, and after the first device receives the Hello packet sent by the second device, the holding time carried in the received Hello packet is compared with the locally configured holding time, and the holding time with a smaller value is selected as the holding time for which the negotiation between the first device and the second device is successful.
In a second aspect, an embodiment of the present application provides a route establishment apparatus, where the route establishment apparatus is configured to implement the method and the function performed by the first device in the first aspect, and the route establishment apparatus is implemented by hardware/software, where the hardware/software includes modules corresponding to the functions.
In a third aspect, an embodiment of the present application provides a routing device, including: the routing establishment method comprises a processor, a memory and a communication bus, wherein the communication bus is used for realizing connection communication between the processor and the memory, and the processor executes a program stored in the memory for realizing the steps in the routing establishment method provided by the first aspect.
In one possible design, the routing device provided by the embodiment of the present application may include a module for performing the corresponding actions of the electromagnetic radiation control apparatus in the above method design. The modules may be software and/or hardware.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium having stored therein instructions, which, when executed on a computer, cause the computer to perform the methods of the above-mentioned aspects.
In a fifth aspect, embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the above aspects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
Fig. 1 is a schematic structural diagram of a routing system according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a method for establishing a route according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a route establishment apparatus according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a routing device according to an embodiment of the present application.
Detailed Description
The embodiments of the present application will be described below with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a routing system provided in an embodiment of the present application, where the routing system includes a first device and a second device, where the first device and the second device may be routing devices, such as Open Shortest Path First (OSPF) routers, devices that provide voice and/or data connections to users, devices that are connected to a computing device, such as a laptop computer or a desktop computer, or devices that are independent devices, such as a Personal Digital Assistant (PDA). A user equipment may also be called a system, subscriber unit, subscriber station, mobile, remote station, access point, remote terminal, access terminal, user agent, or user device. A base station may be an access point, a node B, an evolved node B (eNB), or a 5G base station (gNB), which refers to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The base station may act as a router between the wireless terminal and the rest of the access network by converting received air-interface frames to IP packets.
Based on the above system, the process of establishing the neighbor relation between the first device and the second device includes: when first equipment receives a Hello message sent by second equipment on an OSPF interface, recording the second equipment and setting the state of the second equipment to be an initial state, then sending the Hello message carrying an equipment identifier of the second equipment to the second equipment, after the second equipment receives the Hello message, determining that the Hello message comprises the equipment identifier of the second equipment, establishing a neighbor relation with the first equipment, and setting the neighbor state of the first equipment to be two-way. In addition, the second device may also continue to send a Hello packet to the first device, where the Hello packet carries the device identifier of the first device, and after receiving the Hello packet, the first device determines that the Hello packet includes the device identifier of the first device, sets the neighbor state of the second device to be two-way, and finally establishes the neighbor relationship.
When the first device and the second device establish the neighbor relationship, protocol parameters such as a Hello Timer are carried in a Hello message, after the first device or the second device receives the Hello message sent by an opposite terminal device (the second device or the first device), the received Hello Timer is compared with a locally configured Hello Timer, the first device or the second device takes the minimum Hello Timer as the reference, and after the negotiation of other protocol parameters is completed, the establishment of the neighbor relationship is completed. However, after the first device or the second device modifies the configured Hello Timer, the modified Hello Timer is sent to the peer device through a Hello message, and after the peer device receives the Hello message, the peer device determines that the Hello Timer changes, first disconnects the neighbor relation between the first device and the second device, cancels the route issued by the neighbor, and then restarts the negotiation. When the neighbor is disconnected and the route is withdrawn, the route of the device will oscillate once, resulting in forwarding failure or path switching packet loss. In order to solve the above problem, the embodiments of the present application propose the following solutions.
Referring to fig. 2, fig. 2 is a schematic flow chart of a route establishing method according to an embodiment of the present application, where the method includes, but is not limited to, the following steps:
s201, when detecting that the neighbor relation with the second device needs to be reestablished, the first device acquires the holding time carried in the Hello message.
In a specific implementation, when detecting that a protocol parameter in a local Hello message changes or a protocol parameter in a Hello message received from a second device changes, a first device determines that a neighbor relation needs to be reestablished with the second device, and at this time, obtains a holding time carried in the Hello message. In the embodiment of the present application, a TLV field is added to the Hello packet, T represents a Hold-time (Hold-timer), L represents a length of the field, and V represents a value of the Hold-time. And the maintaining time is longer than the sum of the time required by the first equipment for modifying the protocol parameter and the time required by the second equipment for modifying the protocol parameter, so that the first equipment and the second equipment can reestablish and complete the neighbor relation within the maintaining time.
In addition, before the first device and the second device reestablish the neighbor relationship, the first device and the second device may generate a Hello message, where the Hello message carries the holding time, and after the first device receives the Hello message sent by the second device, the holding time carried in the Hello message is compared with the locally configured holding time, and the holding time with a smaller value is selected as the holding time negotiated between the first device and the second device.
It should be noted that, when detecting that a protocol parameter in a local or received Hello message changes, or that routing information issued by the second device changes, or that routing interruption occurs, the neighbor relationship needs to be reestablished with the second device. However, when the protocol parameter in the local or received Hello message changes, the route does not need to be interrupted, and otherwise, not only the neighbor relation needs to be disconnected, but also the route is interrupted. The embodiment of the application solves the problem of reducing the route interruption when the protocol parameter in the Hello message changes.
Optionally, the Hello packet includes a timing time; when the first device detects that a neighbor relation needs to be reestablished with a second device, before obtaining the holding time carried by a Hello message, the first device obtains the waiting time for receiving the Hello message sent by the second device; and when the waiting time length exceeds the timing time, determining to reestablish the neighbor relation with the second equipment.
Further optionally, the Hello packet further includes a timeout number; and when the number of times of not receiving the Hello message sent by the second equipment exceeds the overtime number, the first equipment determines to reestablish the neighbor relation with the second equipment.
S202, the first device maintains the pre-generated first routing table information in the maintenance time, and generates second routing table information according to the routing information reissued by the second device.
In a specific implementation, because the holding time is configured in the Hello packet, when it is detected that the neighbor relationship with the second device needs to be reestablished, after the neighbor relationship between the first device and the second device is disconnected, the pre-generated first routing table information is not immediately updated, but the pre-generated first routing table information is kept unchanged in the holding time, and the second routing table information is generated according to the routing information reissued by the second device, so that the routing connection is not interrupted in the holding time under the condition of modifying the protocol parameters. In addition, during the maintenance time, the first device may modify the protocol parameters to reestablish the neighbor relation with the second device. And when the waiting maintenance time is over, the first device and the second device already reestablish the neighbor relation, and the routing information synchronization is completed.
S203, when the first device waits for the end of the maintaining time, and when the first routing table information is determined to be the same as the second routing table information, the first device maintains the routing connection between the first device and the second device.
In a specific implementation, when it is determined that the first routing table information is the same as the second routing table information, it is determined that a neighbor relation is disconnected due to a change in protocol parameters in a local or received Hello message, and the routing information is not changed, so that when the maintenance time is waited for to end, the routing connection between the first device and the second device is still maintained, thereby reducing the routing interruption time when modifying the protocol parameters to reestablish the neighbor, and ensuring normal service forwarding.
In addition, when the maintenance time is waited for to end, when the first routing table information is determined to be different from the second routing table information, the routing information is changed, the second routing table information is used for replacing the first routing table information, the changed routing information is updated, the routing connection between the first device and the second device is reestablished, and only the changed routing convergence is influenced.
In the embodiment of the application, when detecting that the neighbor relation with the second device needs to be reestablished, the first device obtains the holding time carried in the Hello message; in the maintenance time, keeping the first routing table information generated in advance, and generating second routing table information according to the routing information reissued by the second equipment; when the maintenance time is over, when the first routing table information is determined to be the same as the second routing table information, the routing connection between the first device and the second device is maintained, so that when the protocol parameters are modified to reestablish the neighbor, the routing interruption time can be reduced, and the normal forwarding of service data is guaranteed.
The method of the embodiments of the present application is set forth above in detail and the apparatus of the embodiments of the present application is provided below.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a route establishing apparatus according to an embodiment of the present application, where the route establishing apparatus may include an obtaining module 301 and an obtaining module 302, where details of each module are described below.
An obtaining module 301, configured to obtain the holding time carried in the Hello message when it is detected that the neighbor relation needs to be reestablished with the second device;
a processing module 302, configured to keep the pre-generated first routing table information and generate second routing table information according to the routing information reissued by the second device during the maintenance time;
the processing module 302 is further configured to, when it is determined that the first routing table information is the same as the second routing table information, maintain the routing connection between the first device and the second device while waiting for the maintenance time to end.
Optionally, the processing module 302 is further configured to modify the protocol parameter and reestablish the neighbor relation with the second device within the maintenance time.
Wherein the maintaining time is longer than the sum of the time length required by the first equipment to modify the protocol parameter and the time length required by the second equipment to modify the protocol parameter.
Wherein the Hello packet includes a timing time;
optionally, the obtaining module 301 is further configured to obtain a waiting duration for receiving the Hello packet sent by the second device; the processing module 302 is further configured to determine to reestablish the neighbor relation with the second device when the waiting duration exceeds the timing time.
Wherein, the Hello message also comprises overtime times;
optionally, the processing module 302 is further configured to determine to reestablish the neighbor relationship with the second device when the number of times that the Hello packet sent by the second device is not received exceeds the timeout number.
Optionally, the processing module 302 is further configured to, when it is determined that the first routing table information is different from the second routing table information after the maintenance time is ended, replace the first routing table information with the second routing table information, and reestablish the routing connection between the first device and the second device.
It should be noted that the implementation of each module may also correspond to the corresponding description of the method embodiment shown in fig. 2, and perform the method and the function performed by the first device in the foregoing embodiment.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a routing device according to the present application. As shown in fig. 4, the routing device may include: at least one processor 401, at least one communication interface 402, at least one memory 403 and at least one communication bus 404.
The processor 401 may be, for example, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a digital signal processor and a microprocessor, or the like. The communication bus 404 may be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 4, but this does not indicate only one bus or one type of bus. A communication bus 404 is used to enable connective communication between these components. The communication interface 402 of the device in the embodiment of the present application is used for performing signaling or data communication with other node devices. The Memory 403 may include a volatile Memory, such as a Nonvolatile dynamic Random Access Memory (NVRAM), a phase change Random Access Memory (PRAM), a Magnetoresistive Random Access Memory (MRAM), and the like, and may further include a Nonvolatile Memory, such as at least one magnetic Disk Memory device, an electrically erasable Programmable Read-Only Memory (EEPROM), a flash Memory device, such as a nor flash Memory (NORflash Memory) or a nor flash Memory (NAND flash Memory), a semiconductor device, such as a Solid State Disk (SSD), and the like. The memory 403 may optionally be at least one storage device located remotely from the processor 401. A set of program codes may also optionally be stored in memory 403 and the processor 401 may also optionally execute the programs executed in memory 403.
When detecting that the neighbor relation with the second device needs to be reestablished, obtaining the maintaining time carried in the Hello message;
in the maintenance time, keeping the first routing table information generated in advance, and generating second routing table information according to the routing information reissued by the second equipment;
when the first routing table information and the second routing table information are determined to be the same when waiting for the maintenance time to end, maintaining the routing connection between the first device and the second device.
Optionally, the processor 401 is further configured to perform the following operations:
and modifying the protocol parameters and the second equipment to reestablish the neighbor relation within the maintaining time.
Wherein the maintaining time is longer than the sum of the time length required by the first equipment to modify the protocol parameter and the time length required by the second equipment to modify the protocol parameter.
Optionally, the processor 401 is further configured to perform the following operations:
acquiring the waiting time for receiving the Hello message sent by the second device;
and when the waiting time length exceeds the timing time, determining to reestablish the neighbor relation with the second equipment.
Optionally, the processor 401 is further configured to perform the following operations:
and when the number of times that the Hello message sent by the second equipment is not received exceeds the overtime number, determining to reestablish the neighbor relation with the second equipment.
Optionally, the processor 401 is further configured to perform the following operations:
and when the first routing table information is determined to be different from the second routing table information after the maintenance time is over, replacing the first routing table information with the second routing table information, and reestablishing the routing connection between the first equipment and the second equipment.
Further, the processor may cooperate with the memory and the communication interface to perform the operations of the route establishment apparatus in the embodiments of the above application.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present application in detail. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (14)
1. A method for route establishment, the method comprising:
when detecting that the neighbor relation with the second equipment needs to be reestablished, the first equipment acquires the maintenance time carried in the Hello message;
the first equipment keeps the pre-generated first routing table information in the maintaining time and generates second routing table information according to the routing information reissued by the second equipment;
when the first device waits for the maintenance time to end, when the first routing table information is determined to be the same as the second routing table information, maintaining the routing connection between the first device and the second device.
2. The method of claim 1, wherein after the obtaining the holding time carried by the Hello packet, further comprising:
and the first equipment modifies the protocol parameters and reestablishes the neighbor relation with the second equipment within the maintaining time.
3. The method of claim 2, wherein the hold time is greater than a sum of a length of time required for the first device to modify the protocol parameter and for the second device to modify the protocol parameter.
4. The method of any of claims 1-3, wherein the Hello message includes a timing time;
when the first device detects that a neighbor relation needs to be reestablished with the second device, before obtaining the holding time carried by the Hello packet, the method further includes:
the first device obtains the waiting time for receiving the Hello message sent by the second device;
and when the waiting time length exceeds the timing time, the first equipment determines to reestablish the neighbor relation with the second equipment.
5. The method of claim 4, wherein the Hello message further includes a timeout number;
when the first device detects that a neighbor relation needs to be reestablished with the second device, before obtaining the holding time carried by the Hello packet, the method further includes:
and when the number of times of not receiving the Hello message sent by the second equipment exceeds the overtime number, the first equipment determines to reestablish the neighbor relation with the second equipment.
6. The method of any one of claims 1-5, further comprising:
and when the first equipment waits for the end of the maintaining time and determines that the first routing table information is different from the second routing table information, the first equipment uses the second routing table information to replace the first routing table information, and reestablishes the routing connection between the first equipment and the second equipment.
7. A route establishment apparatus, characterized in that the apparatus comprises:
the acquisition module is used for acquiring the maintenance time carried in the Hello message when the neighbor relation with the second equipment is detected to be reestablished;
the processing module is used for keeping the pre-generated first routing table information and generating second routing table information according to the routing information reissued by the second equipment in the maintaining time;
the processing module is further configured to, when it is determined that the first routing table information is the same as the second routing table information, maintain the routing connection between the first device and the second device while waiting for the maintenance time to end.
8. The apparatus of claim 7,
the processing module is further configured to modify the protocol parameter and reestablish the neighbor relation with the second device within the maintenance time.
9. The apparatus of claim 8, wherein the hold time is greater than a sum of a length of time required for the first device to modify the protocol parameter and for the second device to modify the protocol parameter.
10. The apparatus of any of claims 7-9, wherein the Hello message includes a timing time;
the obtaining module is further configured to obtain a waiting duration for receiving the Hello packet sent by the second device;
the processing module is further configured to determine to reestablish the neighbor relation with the second device when the waiting duration exceeds the timing time.
11. The apparatus of claim 10, wherein the Hello message further comprises a timeout number;
the processing module is further configured to determine to reestablish the neighbor relation with the second device when the number of times that the Hello packet sent by the second device is not received exceeds the timeout number.
12. The apparatus of any one of claims 7-11,
the processing module is further configured to, when it is determined that the first routing table information is different from the second routing table information after the maintenance time is ended, replace the first routing table information with the second routing table information, and reestablish the routing connection between the first device and the second device.
13. A routing device, comprising: a memory for storing program code, a communication bus, and a processor for invoking the program code to perform the method of any one of claims 1-6.
14. A computer-readable storage medium having stored therein instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810855368.4A CN110784410A (en) | 2018-07-30 | 2018-07-30 | Route establishing method and related equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810855368.4A CN110784410A (en) | 2018-07-30 | 2018-07-30 | Route establishing method and related equipment |
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| CN110784410A true CN110784410A (en) | 2020-02-11 |
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| CN201810855368.4A Withdrawn CN110784410A (en) | 2018-07-30 | 2018-07-30 | Route establishing method and related equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114553559A (en) * | 2022-02-25 | 2022-05-27 | 北京华云安信息技术有限公司 | Method and device for modifying protocol data in router and readable storage medium |
-
2018
- 2018-07-30 CN CN201810855368.4A patent/CN110784410A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114553559A (en) * | 2022-02-25 | 2022-05-27 | 北京华云安信息技术有限公司 | Method and device for modifying protocol data in router and readable storage medium |
| CN114553559B (en) * | 2022-02-25 | 2023-05-23 | 北京华云安信息技术有限公司 | Method and device for modifying protocol data in router and readable storage medium |
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