CN112737944B - Bfd-based peer-link state detection method, device and medium - Google Patents
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Abstract
The embodiment of the application provides a peer-link state detection method, a peer-link state detection device and a peer-link state detection medium based on bfd, which are used for solving the technical problem that when an existing mlag system fails at a three-layer vlan interface, data forwarding errors or system packet loss are easily caused. The method comprises the following steps: constructing an mlag system based on the first network equipment and the second network equipment; carrying out peer-link port configuration on a first network device so as to form bfd detection links between the first network device and a second network device; based on bfd detecting the link, it is determined that the vlan if port of the first network device failed. The bfd detection link is added between the first network device and the second network device based on the bdf network protocol, so that the forwarding error of data or the system packet loss is greatly avoided.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a peer-link state detection method, apparatus, and medium based on bfd.
Background
mlag is a mechanism for implementing cross-device link aggregation, and performs cross-device link aggregation on interfaces on two aggregation switches, thereby improving the link reliability from a single board level to a device level. And the two aggregation switches are connected through a peer-link between the two aggregation switches. In order to ensure reliability, the peer-link generally adopts a two-layer aggregation port, the aggregation port comprises more than 2 physical port links for redundancy (if one physical port link fails, the other link can take over the work), and three layers of ip are configured through a vlan interface for intercommunication.
However, under the traditional mlag networking, the peer-link port can only complete convergence based on the link state of the two-layer aggregation port or the physical port. Therefore, when a failure occurs in the three-layer vlan interface, the mlag system cannot immediately perform subsequent operations for the failure, thereby causing a data forwarding error or a system packet loss.
Disclosure of Invention
The embodiment of the application provides a peer-link state detection method, a peer-link state detection device and a peer-link state detection medium based on bfd, which are used for solving the technical problem that when a three-layer vlan interface of an existing mlag system fails and a two-layer aggregation interface or a physical interface link state is still normal, data forwarding errors or system packet loss are easily caused.
In a first aspect, an embodiment of the present application provides a peer-link state detection method based on bfd, including: constructing an mlag system based on the first network equipment and the second network equipment; performing peer-link port configuration on a first network device to form bfd a detection link between the first network device and the second network device; based on bfd detecting the link, it is determined that the vlan if port of the first network device failed.
According to the peer-link state detection method based on bfd, the peer-link ports of the first network device and the second network device are configured, so that a bfd detection link is formed between the first network device and the second network device, and therefore when the vlan interface of the first network device or the vlan interface of the second network device fails, the failed vlan interface can be quickly detected through the bfd detection link, subsequent processing operation is performed in time, and the problem of data forwarding errors or system packet loss is further avoided.
In one implementation manner of the present application, after determining that the vlan if port of the first network device fails, the method further includes: determining that a link state corresponding to a peer-link port of first network equipment is a fault state; and modifying the link states corresponding to the rest physical ports of the first network equipment into fault states.
In one implementation manner of the present application, after determining that the vlan if port of the first network device fails, the method further includes: and deleting the routing information related to the first network equipment in the routing table corresponding to the second network equipment.
In one implementation of the present application, the method further comprises: determining that a link state corresponding to a vlan if port of a first network device is a normal state; and modifying the link states corresponding to the other physical ports of the first network equipment into normal states.
In an implementation manner of the present application, performing peer-link port configuration on a first network device specifically includes: and based on bfd network protocol, encoding the peer-link port of the first network equipment.
In an implementation manner of the present application, determining that a vlan if port of a first network device fails based on bfd detection link specifically includes: performing bidirectional messaging between the first network device and the second network device based on bfd detecting the link; when the second network equipment cannot receive the keepalive keep-alive message from the first network equipment, determining that the first network equipment fails.
In a second aspect, an embodiment of the present application further provides a peer-link state detection apparatus based on bfd, including: the constructing module is used for constructing an mlag system based on the first network equipment and the second network equipment; the configuration module is used for carrying out peer-link port configuration on the first network equipment so as to form bfd detection links between the first network equipment and the second network equipment; a determining module, configured to determine that a vlan if port of the first network device fails based on bfd detecting the link.
In an implementation manner of the present application, the configuration module is further configured to perform encoding processing on a peer-link port of the first network device based on the bfd network protocol.
In one implementation manner of the present application, the determining module is further configured to perform bidirectional message transmission between the first network device and the second network device based on bfd detection link; and determining that the first network device fails when the second network device cannot receive the keepalive keep-alive message from the first network device.
In a third aspect, an embodiment of the present application further provides a non-volatile computer storage medium for peer-link state detection based on bfd, where the non-volatile computer storage medium stores computer-executable instructions configured to: constructing an mlag system based on the first network equipment and the second network equipment; performing peer-link port configuration on the first network device to form bfd a detection link between the first network device and the second network device; based on bfd detecting the link, it is determined that the vlan if port of the first network device failed.
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The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of a peer-link state detection method based on bfd according to an embodiment of the present application;
fig. 2 is a structural diagram of an mlag system according to an embodiment of the present application;
fig. 3 is a schematic diagram of an internal structure of a peer-link state detection apparatus based on bfd according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a peer-link state detection method, a peer-link state detection device and a peer-link state detection medium based on bfd, which are used for solving the technical problem that when an existing mlag system fails at a three-layer vlan interface, data forwarding errors or system packet loss are easily caused.
The technical solutions proposed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a peer-link state detection method based on bfd according to an embodiment of the present application. As shown in fig. 1, the method for detecting the state of the peer-link in the embodiment of the present application includes the following steps:
In an embodiment of the present application, after the first network device and the second network device are configured, the first network device and the second network device perform pairing operation.
Specifically, a first network device and a second network device send Hello messages to each other on a Peer-link, and the Hello messages sent by the first network device and the second network device each carry information such as DFS Group ID, protocol version number, system MAC and the like of the first network device and the second network device; after the first network device and the second network device receive the Hello message of the opposite end, whether the DFS Group ID sent by the opposite end is the same as the DFS Group ID stored in the first network device and the second network device respectively is judged, and if the DFS Group ID is the same, the pairing is successful.
Further, after the pairing is successful, the first network device and the second network device may send a synchronization packet to perform information synchronization, where the information to be synchronized includes a device name, a system MAC, a software version, an M-LAG state, STP BPDU information, an MAC, an ARP, and an IGMP entry.
And after the information synchronization between the first network equipment and the second network equipment is completed, the establishing of the mlag system is completed.
In an embodiment of the present application, after the mlag system is constructed, the peer-link port of the first network device is encoded based on the bfd network protocol. Configured through the port to form bfd a detection link between the first network device and the second network device when the encoding is performed. It can be understood that after the mlag system is constructed, bfd detection links are established, which may also be implemented by encoding a peer-link port of the second network device, and the embodiment of the present application is not limited herein.
It should be noted that bfd is a network protocol for detecting a failure between two network devices, and the detection mechanism is bidirectional transmission of messages between the network devices.
In an embodiment of the present application, based on bfd detecting a link, the first network device and the second network device may periodically send bfd detection packets to the peer, and if bfd detection packets of the peer are not received within the detection time, it is considered that a vlan if port fails.
Taking the vlan if port of the first network device fails, when bfd detection packets are periodically sent to the peer end between the first network device and the second network device, and the vlan if port of the first network device fails under the condition that the second network device does not receive keepalive keep-alive packets from the first network device within a preset time.
Further, after determining that the vlan-link port of the first network device fails, determining that a link state corresponding to the peer-link port of the first network device is a normal state, and moving the first network device out of the mlag system, so that the first network device and the second network device become two independent network devices. It should be noted that, when a vlan if port fails, the first network device and the second network device may not be able to forward traffic or data at the same time, and if the first network device and the second network device forward traffic or data at the same time, a broadcast storm may be caused. Therefore, the link states corresponding to the rest physical ports in the first network device are modified into a failure state, that is, only the peer-link port of the service port of the first network device maintains the normal data transmission function.
Further, after detecting a link based on bfd, determining that a vlan if port of the first network device fails and modifying link states corresponding to the remaining physical ports except the peer-link port in the first network device into a failure state, immediately deleting routing information related to the first network device in a routing table corresponding to the second network device.
In the mlag system shown in fig. 2, when the Device1 performs information interaction with the Device2, the information interaction path may be Device1-SW1-Device2, Device1-SW1-SW2-Device2, Device1-SW2-Device 2; if the vlan 1 port fails and keeps the communication status of the other physical ports except the peer-link port in SW1 in a failure state, the Device1 and the Device2 perform information interaction, which may cause data forwarding error or system packet loss due to the interaction path selected by the Device1 and the Device2, which is the Device1-SW1-Device2 or the Device1-SW1-SW2-Device2, the two pieces of routing information related to the first network Device need to be deleted in the routing table corresponding to the second network Device. Wherein Device1 in FIG. 2 represents a first computer Device and Device2 represents a second computer Device; SW1 represents a first network device and SW2 represents a second network device.
It should be noted that, in the existing mlag system, when it is determined that a vlan-if three-layer port of the first network device SW1 fails and a link state corresponding to the peer-link port is a normal state (a state of establishing a two-layer aggregation port of the peer-link or a state of establishing a physical port is still a normal up state), the mlag system cannot sense the failure of the peer-link port, and cannot perform a convergence action, so that a system packet loss or a packet forwarding error is easily caused. In the embodiment of the present application, based on the bdf network protocol, a bfd detection link added between the first network device SW1 and the second network device SW2 may perform the following convergence action immediately (within one second) after detecting that the vlan if port of the first network device SW1 fails: the first network Device SW1 is moved out of the mlag system, so that the first network Device SW1 and the second network Device SW2 become two independent devices, and after the mlag system is split, only one link Device1-SW2-Device2 of the first computer Device1 and the second computer Device SW2 is active because the aggregation configuration of the first network Device SW1 and the second network Device SW2 is still in and different systemID is used for aggregation, thereby avoiding a loop and greatly avoiding a data forwarding error or a system packet loss.
In an embodiment of the present application, after it is determined that a vlan if port of a first network device is recovered, that is, after a link state corresponding to the vlan if port of the first network device is a normal state, link states corresponding to the remaining physical ports of the first network device are modified to be a normal state, so that a link connected to the first network device recovers normal communication, and after the link connected to the first network device recovers normal communication, two pieces of routing information related to the first network device are re-added to a second network device, and a routing information table is re-established in the first network device.
Based on the same inventive concept, the embodiment of the present application further provides a peer-link state detection apparatus based on bfd, and the internal structure of the apparatus is shown in fig. 3.
Fig. 3 is a schematic diagram of an internal structure of a peer-link state detection apparatus based on bfd according to an embodiment of the present application. As shown in fig. 3, a peer-link state detection apparatus 300 based on bfd according to an embodiment of the present application includes: a building module 301, a configuration module 302, a determination module 303.
Those skilled in the art will appreciate that the internal structure of the bfd-based peer-link state detection apparatus shown in fig. 3 does not constitute a limitation of the bfd-based peer-link state detection apparatus, and in fact, the bfd-based peer-link state detection apparatus may include more or fewer components than those shown in fig. 3, or some components in combination, or an arrangement of different components.
In an embodiment of the present application, the constructing module 301 is configured to construct an mlag system based on a first network device and a second network device; a configuration module 302, configured to perform peer-link port configuration on a first network device to form bfd a detection link between the first network device and a second network device; a determining module 303, configured to determine that the vlan if port of the first network device fails based on bfd detecting the link.
In an embodiment of the present application, the configuration module 302 is further configured to perform encoding processing on a peer-link port of the first network device based on the bfd network protocol; or encoding a peer-link port of the second network device based on bfd network protocol to construct bfd detection link between the first network device and the second network device.
In an embodiment of the present application, the determining module 303 is further configured to perform bidirectional message transmission between the first network device and the second network device based on the link detected by bfd; and determining that the first network device fails when the second network device cannot receive the keepalive keep-alive message from the first network device; or when the first network device cannot receive the keepalive keep-alive message from the second network device, determining that the second network device fails.
One embodiment of the present application provides a non-transitory computer storage medium corresponding to bfd-based peer-link status detection of fig. 1, storing computer-executable instructions configured to:
constructing an mlag system based on the first network equipment and the second network equipment;
performing peer-link port configuration on the first network device to form bfd a detection link between the first network device and the second network device;
based on bfd detecting the link, it is determined that the vlan if port of the first network device failed.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the device and media embodiments, the description is relatively simple as it is substantially similar to the method embodiments, and reference may be made to some descriptions of the method embodiments for relevant points.
The device, the apparatus, and the medium provided in the embodiment of the present application correspond to the method one to one, and therefore, the device, the apparatus, and the medium also have beneficial technical effects similar to those of the corresponding method.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may 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, and so forth) having computer-usable program code embodied therein.
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 application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both permanent and non-permanent, removable and non-removable media, may implement the information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. An bfd-based peer-link state detection method, characterized in that the method comprises:
constructing an mlag system based on the first network equipment and the second network equipment;
performing peer-link port configuration on the first network device to form bfd a detection link between the first network device and the second network device;
determining that a vlan if port of the first network device fails based on the bfd detected link;
after determining that the vlan if port of the first network device fails, the method further comprises:
determining that the link state corresponding to the peer-link port of the first network device is a normal state, and modifying the link states corresponding to the other physical ports of the first network device into a fault state;
determining that a link state corresponding to a vlan if port of the first network device is a normal state;
and modifying the link states corresponding to the other physical ports of the first network equipment into normal states.
2. The bfd-based peer-link state detection method according to claim 1, wherein after determining that a vlan if port of the first network device has failed, the method further comprises:
and deleting the routing information related to the first network equipment in the routing table corresponding to the second network equipment.
3. The method for detecting the peer-link state based on bfd of claim 1, wherein the configuring the peer-link port of the first network device specifically includes:
and based on bfd network protocol, encoding the peer-link port of the first network equipment.
4. The bfd-based peer-link state detection method according to claim 1, wherein the determining that a vlan interface of the first network device has a failure based on the bfd detection link specifically includes:
performing bidirectional messaging between the first network device and the second network device based on the bfd detection link;
and when the second network equipment cannot receive the keepalive keep-alive message from the first network equipment, determining that the first network equipment fails.
5. An bfd-based peer-link state detection device, the device comprising:
the constructing module is used for constructing an mlag system based on the first network equipment and the second network equipment;
a configuration module, configured to perform peer-link port configuration on the first network device, so as to form bfd a detection link between the first network device and the second network device;
a determining module, configured to determine that a vlan if port of the first network device fails based on the bfd detected link;
after determining that the vlan if port of the first network device fails, the apparatus is further configured to:
determining that the link state corresponding to the peer-link port of the first network device is a normal state, and modifying the link states corresponding to the other physical ports of the first network device into a fault state;
determining that a link state corresponding to a vlan if port of the first network device is a normal state;
and modifying the link states corresponding to the other physical ports of the first network equipment into normal states.
6. The bfd-based peer-link state detection device as claimed in claim 5,
the configuration module is configured to perform encoding processing on a peer-link port of the first network device based on bfd network protocols.
7. The bfd-based peer-link state detection device as claimed in claim 5,
the determining module is configured to perform bidirectional packet transmission between the first network device and the second network device based on the bfd detection link;
and the second network device is used for determining that the first network device fails when the second network device cannot receive the keepalive keep-alive message from the first network device.
8. A non-transitory computer storage medium having stored thereon instructions that, when executed, implement an bfd-based peer-link state detection method according to any one of claims 1-4.
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| CN113949623B (en) * | 2021-10-18 | 2024-04-26 | 迈普通信技术股份有限公司 | MLAG double-master exception repairing method and device, electronic equipment and storage medium |
| CN115208854B (en) * | 2022-02-22 | 2023-10-27 | 浪潮思科网络科技有限公司 | MLAG dynamic double-master detection method, device, equipment and medium based on DHCP |
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