CN107786461B - Method and controller for realizing flow table switching - Google Patents
Method and controller for realizing flow table switching Download PDFInfo
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- CN107786461B CN107786461B CN201610725991.9A CN201610725991A CN107786461B CN 107786461 B CN107786461 B CN 107786461B CN 201610725991 A CN201610725991 A CN 201610725991A CN 107786461 B CN107786461 B CN 107786461B
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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
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
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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
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
- H04L47/2458—Modification of priorities while in transit
Abstract
The invention discloses a method and a controller for realizing flow table switching, and relates to the field of software defined networks. The method comprises the following steps: the controller issues a plurality of sets of flow tables aiming at the same service flow to the forwarding equipment, wherein each set of flow table in the plurality of sets of flow tables has different priorities; the controller responds to a preset switching triggering condition, deletes the flow table with the highest priority in the multiple sets of flow tables, so that the forwarding device switches the service flow from a first transmission path indicated by the flow table with the highest priority in the multiple sets of flow tables to a second transmission path indicated by the flow table with the highest priority in the rest of flow tables. Thereby realizing fast switching of the flow table.
Description
Technical Field
The present invention relates to the field of software defined networks, and in particular, to a method and a controller for implementing flow table switching.
Background
Software defined networking technology separates the control plane from the forwarding plane of traditional IP networks. As shown in fig. 1, the forwarding plane may be abstracted as a general controlled software-defined network device, and the control plane may issue a flow table through a standardized protocol such as OpenFlow to control the forwarding device, thereby implementing flexible control of network traffic. By deploying the software-defined network technology, an operator can realize flexible scheduling of key service flows by using the programmable characteristic of the software-defined network equipment, so that a fast, stable and high-quality network is constructed, and user experience is improved.
In a software defined network, there are two main methods for implementing service flow scheduling through a flow table in a current main flow: one is to realize the scheduling of the specified service flow by modifying the flow table, but the method needs to query the flow table library, find out and modify the corresponding flow table entry, and the time delay is large; the other method is that a flow table entry corresponding to a specified service flow is deleted, and then a new flow table guiding the flow direction of the service flow is re-issued, which can meet the scheduling requirement of part of service flows, but when a large number of service flows need to be scheduled, the time delay of batch issuing of flow tables by a control plane is very large, usually in the order of seconds, and real-time scheduling of the service flows cannot be completed.
Disclosure of Invention
The invention aims to solve the technical problems that: how to implement fast switching of flow tables.
According to an aspect of the embodiments of the present invention, there is provided a method for implementing flow table switching, including: the controller issues a plurality of sets of flow tables aiming at the same service flow to the forwarding equipment, wherein each set of flow table in the plurality of sets of flow tables has different priorities; the controller responds to a preset switching triggering condition, deletes the flow table with the highest priority in the multiple sets of flow tables, so that the forwarding device switches the service flow from a first transmission path indicated by the flow table with the highest priority in the multiple sets of flow tables to a second transmission path indicated by the flow table with the highest priority in the rest of flow tables.
In some embodiments, the method comprises: the controller issues a high-priority flow table and a low-priority flow table to the forwarding equipment aiming at the same service flow; the controller deletes the high-priority flow table in response to a preset switching trigger condition so that the forwarding device switches the traffic flow from a first transmission path indicated by the high-priority flow table to a second transmission path indicated by the low-priority flow table.
In some embodiments, the controller forms multiple sets of flow tables according to network planning information, where the network planning information includes traffic flow information, a preferred first transmission path, an alternative second transmission path, and a handover trigger condition for triggering a path handover.
In some embodiments, the method further comprises: the controller increases the priority of the flow table with the highest priority in the remaining flow tables, and issues a new flow table aiming at the service flow, wherein the priority of the new flow table is lower than the increased priority.
In some embodiments, the handover trigger condition comprises: the first transmission path is congested.
In some embodiments, the controller performs switching control by using a flow table switching method for a plurality of traffic flows.
According to another aspect of the embodiments of the present invention, there is provided a controller for implementing flow table switching, including: the flow table issuing module is used for issuing a plurality of groups of flow tables aiming at the same service flow direction forwarding equipment, and each group of flow tables in the plurality of groups of flow tables has different priorities; and the flow table deleting module is used for deleting the flow table with the highest priority in the multiple groups of flow tables in response to a preset switching triggering condition so that the forwarding equipment can switch the service flow from the first transmission path indicated by the flow table with the highest priority in the multiple groups of flow tables to the second transmission path indicated by the flow table with the highest priority in the rest of flow tables.
In some embodiments, the flow table issuing module is configured to issue a high-priority flow table and a low-priority flow table to the forwarding device for the same service flow; the flow table deleting module is used for deleting the high-priority flow table in response to a preset switching triggering condition so that the forwarding device can switch the service flow from a first transmission path indicated by the high-priority flow table to a second transmission path indicated by the low-priority flow table.
In some embodiments, the controller further comprises: and the flow table forming module is used for forming a plurality of groups of flow tables according to the network planning information, wherein the network planning information comprises service flow information, a preferred first transmission path, an alternative second transmission path and a switching triggering condition for triggering path switching.
In some embodiments, the controller further comprises: the priority adjusting module is used for increasing the priority of the flow table with the highest priority in the rest flow tables; the flow table issuing module is also used for issuing a new flow table aiming at the service flow, and the priority of the new flow table is lower than the increased priority.
In some embodiments, the handover trigger condition comprises: the first transmission path is congested.
In some embodiments, the controller is configured to perform switching control by using a flow table switching method for a plurality of traffic flows.
The invention issues a plurality of sets of flow tables with different priorities aiming at the same service flow to the forwarding equipment through the controller, and deletes the flow table with the highest priority in the plurality of sets of flow tables when the preset switching triggering condition is met, so that the forwarding equipment can switch the service flow to the transmission path indicated by the rest flow tables without waiting for issuing a new flow table, thereby realizing the quick switching of the flow tables.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic diagram of a flow table switching method in the related art.
Fig. 2 is a flow chart of an embodiment of the method for switching the flow table according to the present invention.
Fig. 3 shows that the controller issues two sets of flow tables for each five-tuple with the same traffic flow matching.
Fig. 4 is a flowchart illustrating another embodiment of a method for switching a flow table according to the present invention.
Fig. 5 shows the controller deleting the high priority flow table for the same traffic flow.
Fig. 6 is a flow chart illustrating an embodiment of a controller for implementing flow table switching according to the present invention.
Fig. 7 is a flow chart of another embodiment of the controller for implementing flow table switching according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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 invention.
A method for implementing flow table switching according to an embodiment of the present invention is described below with reference to fig. 2.
Fig. 2 is a flow chart of an embodiment of the method for switching the flow table according to the present invention. As shown in fig. 2, the method for implementing flow table switching in this embodiment includes the following steps:
step S202, the controller forms a plurality of sets of flow tables according to the network planning information. The network planning information may include service flow information, a preferred first transmission path, an alternative second transmission path, and a handover triggering condition for triggering a path handover.
For example, the controller may obtain network planning information from a network planning system. The handover trigger condition may comprise the occurrence of a congestion situation for the preferred first transmission path.
Step S204, the controller issues a plurality of sets of flow tables aiming at the same service flow direction forwarding device, wherein each set of flow table in the plurality of sets of flow tables has different priorities.
Optionally, in step S204, the controller issues a high-priority flow table and a low-priority flow table to the forwarding device for the same service flow. As shown in fig. 3, the controller issues two sets of flow tables to each matching five-tuple for the same service flow. Wherein the high priority flow table indicates forwarding the traffic flow from the a port, and the low priority flow table indicates forwarding the traffic flow from the b port.
In step S206, the controller deletes the flow table with the highest priority in the multiple sets of flow tables in response to a preset switching trigger condition, so that the forwarding device switches the service flow from the first transmission path indicated by the flow table with the highest priority in the multiple sets of flow tables to the second transmission path indicated by the flow table with the highest priority in the remaining flow tables.
Optionally, in step S206, the controller deletes the high-priority flow table in response to a preset switching trigger condition, so that the forwarding device switches the traffic flow from the first transmission path indicated by the high-priority flow table to the second transmission path indicated by the low-priority flow table. Still taking fig. 3 as an example, the controller deletes the high priority flow table, so that the forwarding device forwards the traffic flow according to the indication of the low priority flow table.
Through the embodiment, the controller issues multiple groups of flow tables with different priorities for the same service flow to the forwarding device, and when the preset switching triggering condition is met, the flow table with the highest priority in the multiple groups of flow tables is deleted, so that the forwarding device can switch the service flow to the transmission path indicated by the rest flow tables without waiting for issuing a new flow table, and the quick switching of the flow tables is realized.
A method for implementing flow table switching according to another embodiment of the present invention is described below with reference to fig. 4.
Fig. 4 is a flowchart illustrating another embodiment of a method for switching a flow table according to the present invention. As shown in fig. 4, based on the embodiment shown in fig. 2, the method for implementing flow table switching in this embodiment further includes:
step S408, the controller increases the priority of the flow table with the highest priority in the remaining flow tables, and issues a new flow table aiming at the service flow, wherein the priority of the new flow table is lower than the increased priority.
Taking fig. 5 as an example, the controller issues a high priority flow table and a low priority flow table to the forwarding device for the same service flow. When the preset switching triggering condition is met, the controller deletes the flow table with the highest priority, and at the moment, the forwarding device switches the service flow from the first transmission path indicated by the flow table with the high priority to the second transmission path indicated by the flow table with the low priority. Then, the controller may modify the priority of the current flow table from low priority to high priority, and issue a new flow table with low priority again for the same traffic flow to instruct the forwarding device to forward the same traffic flow along other paths from port b.
In the above embodiment, the controller increases the priority of the flow table with the highest priority in the remaining flow tables, and issues a new flow table for the service flow, where the priority of the new flow table is lower than the increased priority, and the flow table may be complementarily issued after the flow table is deleted, so as to further implement fast switching of the flow table in the following.
Optionally, in each of the above embodiments, the controller may perform switching control on a plurality of service flows by using a flow table switching method, so that the forwarding device forwards the service flows according to an indication of the switched flow table.
A controller implementing flow table switching according to an embodiment of the present invention is described below with reference to fig. 6.
Fig. 6 is a flow chart illustrating an embodiment of a controller for implementing flow table switching according to the present invention. As shown in fig. 6, the controller 60 that realizes the flow table switching in this embodiment includes:
a flow table forming module 602, configured to form multiple sets of flow tables according to network planning information, where the network planning information includes service flow information, a preferred first transmission path, an alternative second transmission path, and a handover triggering condition for triggering path handover
The flow table issuing module 604 is configured to issue multiple sets of flow tables to the forwarding device for the same service flow, where each set of flow table in the multiple sets of flow tables has a different priority.
Optionally, the flow table issuing module 604 is configured to issue a high-priority flow table and a low-priority flow table to the forwarding device for the same service flow.
The flow table deleting module 606 is configured to delete the flow table with the highest priority in the multiple sets of flow tables in response to a preset switching trigger condition, so that the forwarding device switches the service flow from the first transmission path indicated by the flow table with the highest priority in the multiple sets of flow tables to the second transmission path indicated by the flow table with the highest priority in the remaining flow tables.
Optionally, the flow table deleting module 606 is configured to delete the high-priority flow table in response to a preset switching trigger condition, so that the forwarding device switches the service flow from the first transmission path indicated by the high-priority flow table to the second transmission path indicated by the low-priority flow table.
Through the embodiment, the controller issues multiple groups of flow tables with different priorities for the same service flow to the forwarding device, and when the preset switching triggering condition is met, the flow table with the highest priority in the multiple groups of flow tables is deleted, so that the forwarding device can switch the service flow to the transmission path indicated by the rest flow tables without waiting for issuing a new flow table, and the quick switching of the flow tables is realized.
Optionally, the handover triggering condition includes: the first transmission path is congested.
Optionally, the controller is configured to perform switching control by using a flow table switching method for multiple service flows.
A controller implementing flow table switching according to another embodiment of the present invention is described below with reference to fig. 7.
Fig. 7 is a flow chart of another embodiment of the controller for implementing flow table switching according to the present invention. As shown in fig. 7, the controller 70 that realizes the flow table switching in this embodiment includes:
a priority adjustment module 708, configured to adjust the priority of the flow table with the highest priority among the remaining flow tables higher.
The flow table issuing module 604 is further configured to issue a new flow table for the service flow, where the priority of the new flow table is lower than the increased priority.
The controller of the invention issues a plurality of sets of flow tables aiming at the same service flow direction forwarding equipment, wherein each set of flow table in the plurality of sets of flow tables has different priorities; the controller responds to a preset switching triggering condition, deletes the flow table with the highest priority in the multiple groups of flow tables, so that the forwarding device switches the service flow from a first transmission path indicated by the flow table with the highest priority in the multiple groups of flow tables to a second transmission path indicated by the flow table with the highest priority in the rest of flow tables, and the quick switching of the flow tables is realized.
In the above embodiment, the controller increases the priority of the flow table with the highest priority in the remaining flow tables, and issues a new flow table for the service flow, where the priority of the new flow table is lower than the increased priority, and the flow table may be complementarily issued after the flow table is deleted, so as to further implement fast switching of the flow table in the following.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method of implementing flow table switching, comprising:
the controller issues a plurality of sets of flow tables aiming at the same service flow to the forwarding equipment, wherein each set of flow table in the plurality of sets of flow tables has different priorities;
the controller responds to a preset switching triggering condition, deletes the flow table with the highest priority in the multiple groups of flow tables, so that the forwarding device can switch the service flow from a first transmission path indicated by the flow table with the highest priority in the multiple groups of flow tables to a second transmission path indicated by the flow table with the highest priority in the remaining flow tables;
the controller increases the priority of the flow table with the highest priority in the remaining flow tables, and issues a new flow table aiming at the service flow, wherein the priority of the new flow table is lower than the increased priority.
2. The method of claim 1, wherein:
the controller issues multiple sets of flow tables for the same service flow to the forwarding device, including:
the controller issues a high-priority flow table and a low-priority flow table to the forwarding equipment aiming at the same service flow;
the controller responds to a preset switching trigger condition, and deleting the flow table with the highest priority in the plurality of groups of flow tables comprises the following steps:
the controller responds to a preset switching triggering condition, deletes the high-priority flow table, so that the forwarding device switches the service flow from a first transmission path indicated by the high-priority flow table to a second transmission path indicated by the low-priority flow table.
3. The method of claim 1, wherein the controller forms the plurality of sets of flow tables according to network planning information, the network planning information including traffic flow information, a preferred first transmission path, an alternative second transmission path, a handover trigger condition for triggering a path handover.
4. The method of claim 1, wherein the handover trigger condition comprises: the first transmission path is congested.
5. A controller to implement flow table switching, comprising:
the flow table issuing module is used for issuing a plurality of groups of flow tables aiming at the same service flow direction forwarding equipment, and each group of flow tables in the plurality of groups of flow tables has different priorities; the system is also used for issuing a new flow table aiming at the service flow, and the priority of the new flow table is lower than the priority of the new flow table which is adjusted by the priority adjusting module;
a flow table deleting module, configured to delete a flow table with a highest priority in the multiple sets of flow tables in response to a preset switching trigger condition, so that the forwarding device switches the service flow from a first transmission path indicated by the flow table with the highest priority in the multiple sets of flow tables to a second transmission path indicated by the flow table with the highest priority in the remaining flow tables;
and the priority adjusting module is used for increasing the priority of the flow table with the highest priority in the rest flow tables.
6. The controller of claim 5,
the flow table issuing module is used for issuing a high-priority flow table and a low-priority flow table to the forwarding equipment aiming at the same service flow;
the flow table deleting module is configured to delete the high-priority flow table in response to a preset switching trigger condition, so that the forwarding device switches the service flow from a first transmission path indicated by the high-priority flow table to a second transmission path indicated by the low-priority flow table.
7. The controller of claim 5, wherein the controller further comprises:
and the flow table forming module is used for forming the multiple groups of flow tables according to network planning information, wherein the network planning information comprises service flow information, a preferred first transmission path, an alternative second transmission path and a switching triggering condition for triggering path switching.
8. The controller of claim 5, wherein the handover trigger condition comprises: the first transmission path is congested.
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Application publication date: 20180309 Assignee: China Telecom Intelligent Network Technology Co.,Ltd. Assignor: CHINA TELECOM Corp.,Ltd. Contract record no.: X2023110000025 Denomination of invention: Method and controller for realizing flow table switching Granted publication date: 20210629 License type: Exclusive License Record date: 20230220 |