CN113497753A - Cross-device link aggregation method and system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/24—Multipath
- H04L45/245—Link aggregation, e.g. trunking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/82—Miscellaneous aspects
- H04L47/827—Aggregation of resource allocation or reservation requests
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Abstract
The invention discloses a cross-device link aggregation method and a system, which relate to the field of reliability of digital communication devices. And if the current flow exceeds the range of the preset threshold value, adding or removing the port of the remote member of the link aggregation group into or out of the MC-LAG link aggregation group. The invention provides a cross-device link aggregation method and a cross-device link aggregation system, wherein link aggregation becomes flexible and variable, the advantage of the forwarding capability of cross-device link aggregation can be played, and the influence of link aggregation on the bandwidth of an interconnection link can be reduced.
Description
Technical Field
The invention relates to the field of data communication equipment reliability, in particular to a cross-equipment link aggregation method and a cross-equipment link aggregation system.
Background
Both traditional enterprise networks, or today's data centers, have a common need: high availability. But there is also a common problem: potential network single point failures. And single-point-to-single-point network transmission is adopted, and once a port fails, the whole network is paralyzed. By adopting a connection mode of a plurality of ports to a plurality of ports under one device, once the device fails, the whole network is broken down.
Therefore, the existing data connection often adopts a link mode, and a plurality of devices are connected with each other. By adopting the link aggregation technology, the purpose of increasing the link bandwidth can be achieved by binding a plurality of physical interfaces into one logical interface without hardware upgrading. When the purpose of increasing the bandwidth is realized, the link aggregation adopts a mechanism of a backup link, so that the reliability of the link between the devices can be effectively improved. The link aggregation technique has the following three advantages:
1. increasing bandwidth
The maximum bandwidth of the link aggregation interface can reach the sum of the bandwidths of the member interfaces.
2. Improved reliability
When a certain active link fails, the flow can be switched to other available member links, so that the reliability of the link aggregation interface is improved.
3. Load sharing
Thus, within a link aggregation group, load sharing on each member's active link can be achieved.
The cross device link aggregation technology is an upgraded version of the link aggregation technology, which configures physical ethernet ports on different member switches as one aggregation port. Therefore, even if a certain member switch fails or one link of the aggregation links fails, the aggregation link cannot be completely failed, so that reliable transmission of data flow is ensured, and the advantages of bandwidth increase, reliability improvement, load sharing and the like are improved from a port level to a device level.
However, there are two main ways of cross-device link aggregation technology at present, one is MC-LAG multi-chassis link aggregation technology, and the other is stacked system cross-device link aggregation.
The MC-LAG has the technical advantages that the configuration is relatively independent, only the aggregation configuration is shared among member devices, and other protocol configurations are not shared; the disadvantage is that the application scenario is limited, the aggregation port of the MC-LAG is enabled, the traffic is only forwarded locally, and when the super bandwidth condition occurs, the traffic of the local aggregation port is discarded even if the far-end aggregation port is completely idle.
The cross-device link aggregation based on the stack system has the technical advantages that member devices share all configurations, an aggregation port member comprises a local interface and a remote interface, and traffic can be subjected to load sharing on the aggregation port; the method has the disadvantages that under the condition that the local bandwidth is sufficient, the flow can also be sent to a remote aggregation member port through the stacked interconnection link to be forwarded, the bandwidth of the stacked interconnection link is wasted, and under the condition that a plurality of cross-device link aggregation groups exist at the same time, the interconnection link can finally become a bandwidth bottleneck.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cross-device link aggregation method and a cross-device link aggregation system, wherein link aggregation becomes flexible and variable, the forwarding capability advantage of cross-device link aggregation can be exerted, and the influence of link aggregation on the bandwidth of an interconnection link can be reduced.
To achieve the above object, in a first aspect, an embodiment of the present invention provides a cross-device link aggregation method, which includes:
periodically measuring the current flow of a local port of an MC-LAG link aggregation group;
and if the current flow exceeds the range of the preset threshold value, adding or removing the port of the remote member of the link aggregation group into or out of the MC-LAG link aggregation group.
As a preferred embodiment, if the current traffic is higher than the preset threshold range, adding the port of the remote member of the link aggregation group into the MC-LAG link aggregation group.
As a preferred embodiment, if the current traffic is lower than the preset threshold range, the port of the remote member of the link aggregation group is moved out of the MC-LAG link aggregation group.
As a preferred embodiment, if the current traffic is within the preset threshold range, the current link aggregation group is kept unchanged.
As a preferred embodiment, the preferential forwarding of traffic at the local port of the link aggregation group is realized by controlling the port of the member of the link aggregation group to be issued to hardware through a software module.
As a preferred embodiment, the flow rate of the local port of the aggregation link group is monitored in real time by the FPGA, and once the flow rate exceeds the preset threshold range, the software module sends a notification to the software module, and the software module adds or removes the remote member of the link aggregation group according to the passing.
As a preferred embodiment, the software module determines a preset threshold range, and issues the threshold range to the FPGA together with the local port of the link aggregation group, and after the software module completes issuing, waits for notification of the FPGA.
In a second aspect, an embodiment of the present invention further provides a cross-device link aggregation system, which includes:
the detection module is used for periodically measuring the current flow of the local port of the MC-LAG link aggregation group;
and the comparison module is used for adding or removing the port of the remote member of the link aggregation group into or out of the MC-LAG link aggregation group if the current flow exceeds the range of the preset threshold value.
As a preferred embodiment, the comparing module includes an adding submodule, and the adding submodule is configured to add the port of the remote member of the link aggregation group to the MC-LAG link aggregation group if the current traffic is higher than the preset threshold range.
As a preferred embodiment, the comparing module includes a removing submodule, and the removing submodule is configured to move the port of the remote member of the link aggregation group out of the MC-LAG link aggregation group if the current traffic is lower than the preset threshold range.
Compared with the prior art, the invention has the advantages that:
the method and the system for cross-device link aggregation keep that one access device can be simultaneously accessed to two upstream physical devices through link binding through an MC-LAG link aggregation group. However, in the case that the MC-LAG link aggregation group exceeds the bandwidth, part of the local aggregation port traffic is discarded. Therefore, the invention further adds a mode of stacking system-based cross-device link aggregation on the MC-LAG link aggregation group, namely, adding a far-end device aggregation member port in the case of traffic exceeding the bandwidth. The safety, stability and high efficiency of cross-device link aggregation are ensured.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings corresponding to the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart illustrating steps of a cross-device link aggregation method according to an embodiment of the present invention;
fig. 2 is a flowchart of a hardware method under a remote port of a software-controlled link aggregation group according to an embodiment of a cross-device link aggregation method of the present invention;
fig. 3 is a flow chart of an FPGA traffic notification according to an embodiment of a cross-device link aggregation method of the present invention;
fig. 4 is a schematic structural diagram of an embodiment of a cross-device link aggregation system according to the present invention.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the invention provides a cross-device link aggregation method and a cross-device link aggregation system, which enable cross-device link aggregation to be flexible and variable by selectively combining part of technologies in MC-LAG multi-framework link aggregation and part of technologies in stacking system cross-device link aggregation, can exert the forwarding capability advantage of cross-device link aggregation to the maximum extent, and can reduce the influence on the bandwidth of interconnected links.
In order to achieve the technical effects, the general idea of the application is as follows: periodically measuring the current flow of a local port of an MC-LAG link aggregation group;
and if the current flow exceeds the range of the preset threshold value, adding or removing the port of the remote member of the link aggregation group into or out of the MC-LAG link aggregation group.
In summary, it is checked whether the total traffic of the MC-LAG link aggregation group exceeds the allowable traffic range through real-time detection, and when the MC-LAG link aggregation group exceeds the allowable traffic range, the ports of the remote members of the link aggregation group are added or removed, so that the bandwidth is further increased, and the requirements of traffic variation and cost control are further met.
In order to better understand the technical solution, the following detailed description is made with reference to specific embodiments.
Referring to fig. 1, an embodiment of the present invention provides a cross-device link aggregation method, which includes:
s1: and periodically measuring the current traffic of the local port of the MC-LAG link aggregation group.
And the current flow is measured in real time, so that the flow among the link aggregation groups can be managed in a targeted manner. The configuration of the devices in the MC-LAG link is relatively independent, only the aggregation configuration is shared among the member devices, and other protocol configurations are not shared, so that the MC-LAG device is convenient to manage, but the application scenarios are limited, the traffic of the aggregation port of the MC-LAG is only forwarded locally, and when the super bandwidth condition occurs, the traffic of the local aggregation port is discarded even if the aggregation port of the remote device is completely idle. To ameliorate this disadvantage requires monitoring of the flow.
S2: and if the current flow exceeds the range of the preset threshold value, adding or removing the port of the remote member of the link aggregation group into or out of the MC-LAG link aggregation group.
The method comprises the steps of setting a preset threshold range, selectively adding or removing a remote member of a link aggregation group according to the current flow and the range of the preset threshold, effectively reducing the forwarding load of the link in time, improving the reliability of the system and improving the efficiency of link forwarding.
Preferably, if the current traffic is higher than the preset threshold range, adding the port of the remote member of the link aggregation group into the MC-LAG link aggregation group.
When the flow is higher than the preset threshold range, the MC-LAG has the possibility of screening and discarding the flow, but the invention directly adds the port of the remote member of the link aggregation group into the MC-LAG link aggregation group, thereby providing higher bandwidth and preventing the MC-LAG from shaping and discarding the flow.
Further, if the current traffic is lower than the preset threshold range, moving the port of the remote member of the link aggregation group out of the MC-LAG link aggregation group.
When the traffic is too low, the MC-LAG link aggregation group always uses the ports of the remote members of the link aggregation group, which causes waste of interconnect bandwidth and reduction of forwarding efficiency. Therefore, it is preferable to move the port of the remote member of the link aggregation group out of the MC-LAG link aggregation group.
Further, if the current flow is within the preset threshold range, the current link aggregation group is kept unchanged.
If the ports of the remote devices of the link aggregation group are frequently added and removed, the stability of the system is affected, and therefore, it is preferable to keep the current link aggregation group unchanged when the traffic is within the preset threshold range.
As another preferred embodiment, the priority forwarding of traffic at the local port of the link aggregation group is implemented by controlling the member port of the link aggregation group to be issued to hardware through a software module.
The MC-LAG, as a protocol for device aggregation, may be implemented by performing integrated management through a software module. Therefore, the preferential forwarding of the traffic at the local port of the link aggregation group can be realized in a mode that the software module controls the port of the member of the link aggregation group to be issued to the hardware.
Further, after the MC-LAG link is realized by the software module, the flow of the local port of the aggregation link group is monitored in real time through the FPGA, once the flow exceeds a preset threshold range, the FPGA sends a notice to the software module, and the software module adds or removes the remote member of the link aggregation group according to the passing.
For example, as shown in fig. 2, after the software module creates the cross-device link aggregation group, the local member port of the aggregation group is issued to the hardware, so as to implement local forwarding of the aggregation group. And then, issuing the preset upper flow threshold, the preset lower flow threshold and the aggregation group local port to the FPGA, and enabling the FPGA to obtain a flow statistic object and a monitoring basis.
After that, the software starts a process, waits for the FPGA to send a message, and processes according to the FPGA message. There are two types of messages in common: the flow is above the upper threshold and the flow is below the lower threshold. If the message that the flow is higher than the upper limit threshold value is received, the software issues the far-end member port of the aggregation group to the hardware, so that the far-end member port of the aggregation group participates in the flow forwarding of the aggregation group, and the flow of the aggregation group is prevented from exceeding the bandwidth. If a message is received that the traffic is below the lower threshold, indicating that the traffic is below the local bandwidth of the aggregation group, the software removes the remote member port of the aggregation group from the hardware, and allows the traffic to be forwarded only locally. In summary, the software dynamically controls the addition and deletion of the remote member port of the aggregation group in the hardware, so that the local priority forwarding of the traffic is realized.
As shown in fig. 3, for the FPGA, the flow information notification process is as follows:
step 101: the method comprises the steps of firstly obtaining a preset upper flow threshold value, a preset lower flow threshold value and a local port of a cross-device link aggregation group from software, and setting a flow record as a lower limit.
Step 102: and periodically acquiring the traffic data of the local port of the aggregation group.
Step 103: judging whether the flow is greater than a preset upper limit threshold value, checking whether the flow record is over-limit, and if so, turning to step 104; otherwise, go to step 105;
step 104: sending a message to software that the flow is above an upper threshold
Step 105: judging whether the flow is smaller than a preset lower limit threshold value, and judging whether the flow record is over-limit, if so, turning to step 106; otherwise go to step 107
Step 106: and sending an announcement message to the software, wherein the flow rate of the announcement message is lower than the lower limit threshold value.
Step 107: no processing is performed to wait for the timeout period and step 102 is repeated.
The upper limit threshold and the lower limit threshold of the flow are respectively set, so that frequent sending of notification messages caused by flow oscillation is avoided, and the risk of switching back and forth between local forwarding of the port of the aggregation group member and full forwarding of the port of the aggregation group member is avoided.
As shown in fig. 4, the present invention also provides a cross-device link aggregation system, which includes:
the detection module is used for periodically measuring the current flow of the local port of the MC-LAG link aggregation group;
and the comparison module is used for adding or removing the port of the remote member of the link aggregation group into or out of the MC-LAG link aggregation group if the current flow exceeds the range of the preset threshold value.
Preferably, the comparing module includes an adding submodule, and the adding submodule is configured to add the port of the remote member of the link aggregation group to the MC-LAG link aggregation group if the current traffic is higher than the preset threshold range.
Further, the comparing module includes a removing sub-module, and the removing sub-module is configured to remove the port of the remote member of the link aggregation group from the MC-LAG link aggregation group if the current traffic is lower than the preset threshold range.
Various modifications and specific examples in the foregoing method embodiments are also applicable to the system of the present embodiment, and the detailed description of the method is clear to those skilled in the art, so that the detailed description is omitted here for the sake of brevity.
In summary, the method and system for cross-device link aggregation provided in the embodiments of the present invention combine the technical advantages of MC-LAG and stacking system to form a backup link aggregation network that can exert the forwarding capability advantage of cross-device link aggregation to the greatest extent and reduce the influence on the bandwidth of the interconnected links.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of cross device link aggregation, comprising:
periodically measuring the current flow of a local port of an MC-LAG link aggregation group;
and if the current flow exceeds the range of the preset threshold value, adding or removing the port of the remote member of the link aggregation group into or out of the MC-LAG link aggregation group.
2. The method of claim 1, wherein:
and if the current flow is higher than the preset threshold range, adding the port of the remote member of the link aggregation group into the MC-LAG link aggregation group.
3. The method of claim 1, wherein:
and if the current flow is lower than the preset threshold range, moving the port of the remote member of the link aggregation group out of the MC-LAG link aggregation group.
4. The method of claim 1, wherein:
and if the current flow is within the preset threshold range, keeping the current link aggregation group unchanged.
5. The method of claim 1, wherein:
the priority forwarding of the flow at the local port of the link aggregation group is realized by controlling the port of the member of the link aggregation group to be issued to the hardware through the software module.
6. The method of claim 5, wherein:
monitoring the flow of a local port of the aggregation link group in real time through an FPGA, and once the flow exceeds a preset threshold range, sending a notice to a software module, and adding or removing the remote member of the link aggregation group by the software module according to the passing.
7. The method of claim 6, wherein:
and the software module confirms the preset threshold range, issues the preset threshold range and the link aggregation group local port to the FPGA, and waits for the notification of the FPGA after the software module finishes issuing.
8. A cross device link aggregation system, comprising:
the detection module is used for periodically measuring the current flow of the local port of the MC-LAG link aggregation group;
and the comparison module is used for adding or removing the port of the remote member of the link aggregation group into or out of the MC-LAG link aggregation group if the current flow exceeds the range of the preset threshold value.
9. The system of claim 8, wherein:
the comparison module comprises an adding submodule, and the adding submodule is used for adding the port of the remote member of the link aggregation group into the MC-LAG link aggregation group if the current flow is higher than the preset threshold range.
10. The system of claim 8, wherein:
the comparison module comprises a removal submodule, and the removal submodule is used for removing the port of the remote member of the link aggregation group out of the MC-LAG link aggregation group if the current flow is lower than a preset threshold range.
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