WO2015030503A1 - Packet output controlling method and network device using same - Google Patents
Packet output controlling method and network device using same Download PDFInfo
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- WO2015030503A1 WO2015030503A1 PCT/KR2014/008030 KR2014008030W WO2015030503A1 WO 2015030503 A1 WO2015030503 A1 WO 2015030503A1 KR 2014008030 W KR2014008030 W KR 2014008030W WO 2015030503 A1 WO2015030503 A1 WO 2015030503A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0895—Configuration of virtualised networks or elements, e.g. virtualised network function or OpenFlow elements
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- the present invention relates to a Software Defined Networking (SDN) technology, and more particularly, to a pipeline processing technology of a flow table for processing packet forwarding in a network device. It relates to a method and a network device using the same.
- SDN Software Defined Networking
- SDN Software defined network refers to a user-oriented network in which a user has control authority regardless of basic network equipment such as a router or a switch, and a separate software controller controls traffic flow.
- OpenFlow is one of the standard standards for SDN technology. It defines the interface between hardware (switch) and controller (network OS) and controls the control of how data packets are delivered through the network. Protocol to separate data from physical network and interact with data plane.
- the flow table is composed of a plurality of tables, which are connected to each other by pipelines to provide flexible parallel processing, providing efficiency and flexibility to OpenFlow switches.
- each table When packets are processed through the pipeline, the action fields formed in each table are stored in an action list in the form of a list, consisting of an action set at the end of the pipeline. In this case, messages are delivered by providing metadata between each table.
- match fields and action sets are updated by flow-specific instructions.
- Actions for each flow can be executed immediately by directives or can be accumulated in a set of actions, which are last executed after passing through all flow tables.
- the output port command executed in the pipeline processing is an action of finally forwarding a packet. Once the output port command is executed, no other command can be executed for the flow. In other words, there is no way to connect to other actions by using output port information.
- the group table is used for multicasting a plurality of ports and the like, and is terminated by finally forwarding a packet through an output port command action. That is, there is no way to link to other actions by using the execution result of the group table.
- An object of the present invention for solving the above problems is to provide a flow processing method that can control the flow based on the output port.
- Another object of the present invention for solving the above problems is to provide a network apparatus for performing a flow processing method to control the flow based on the output port.
- the present invention provides a flow processing method in a plurality of flow tables (N; N is a natural number of two or more) connected by a pipeline, wherein packets flowed in the flow table are selected from among the plurality of tables. Passing through table N-1 to table N-1, and after the packet passes through the N-1 th table, an output-only N th table indicated by the N-1 th table for the packet. performing a processing of a table) and outputting the packet after processing of the N-th table.
- N is a natural number of two or more
- the flow processing method may be performed in a network device that supports software defined networking.
- an output port of a corresponding flow is indicated, and an operation to be processed in the N-th table may be determined by the indicated output port.
- the processing of the output-only N-th table may include attaching a virtual local area network (VLAN) tag to a packet of a flow to be output to the indicated output port.
- VLAN virtual local area network
- the processing of the output-only N-th table may include counting for the flow to be output to the indicated output port, and if the counting for the flow is equal to or exceeds a predetermined threshold, the change of the output port is Can be performed.
- the processing of the output-only N-th table compares the packet size of the flow to be output to the indicated output port with a predetermined threshold value, and if the packet size is equal to or exceeds the predetermined threshold value, It may be configured to perform fragmentation.
- a packet input unit for receiving a packet of flows from the outside, a flow table storage unit for storing a plurality of flow tables (N; N is a natural number of two or more), and input from the packet input unit.
- N is a natural number of two or more
- the output-only N-th table indicated by the N-th table after passing through the N-th table from the first table among the plurality of tables stored in the flow table storage unit ( Provided is a network device including a flow table processing unit for performing an operation of an egress table and a packet output unit for outputting packets of the flow to the outside after the processing of the output-only N-th table by the flow table processing unit.
- the network device may be a network device supporting software defined networking.
- an output port of the corresponding packet is indicated, and an operation to be processed in the N-th table may be determined by the indicated output port.
- the processing of the output-only N-th table may include attaching a Virtual Local Area Network (VLAN) tag to a packet to be output to the indicated output port.
- VLAN Virtual Local Area Network
- the processing of the output-only N-th table may include counting for the flow to be output to the indicated output port, and if the counting for the flow is equal to or exceeds a predetermined threshold, the change of the output port is Can be performed.
- the processing of the output-only N-th table compares the packet size of the flow to be output to the indicated output port with a predetermined threshold value, and if the packet size is equal to or exceeds the predetermined threshold value, It may be configured to perform fragmentation.
- an output port determined using an output table dedicated to output Can be performed in the processing of the pipeline using the flow table. Therefore, the final output can be flexibly controlled through various operations using the output port information.
- 1 and 2 are conceptual diagrams for explaining a processing method of a pipelined flow table.
- FIG. 3 is a conceptual diagram illustrating a flow processing method according to the present invention.
- FIG. 4 is a conceptual diagram illustrating an embodiment of tagging a VLAN ID using a flow processing method according to the present invention.
- FIG. 5 is another conceptual diagram for explaining an embodiment of tagging a VLAN ID using the flow processing method according to the present invention.
- FIG. 6 is a conceptual diagram illustrating an embodiment of an output port change through flow counting using the flow processing method according to the present invention.
- FIG. 7 is a conceptual diagram illustrating an embodiment of packet fragmentation using a flow processing method according to the present invention.
- FIG. 8 is a conceptual diagram illustrating a field configuration of an output table according to the present invention.
- FIG. 9 is a conceptual diagram illustrating a match field structure of an output table.
- FIG. 10 illustrates an example of using a match field using a wild card in an output table according to the present invention.
- FIG. 11 illustrates an example of using a match field for size comparison in an output table according to the present invention.
- FIG. 12 illustrates an example of using a match field for flow counting in an output table according to the present invention.
- FIG. 13 is a block diagram for explaining an embodiment of a network apparatus for performing a flow processing method according to the present invention.
- first, second, A, and B may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- the method of processing a flow table in a pipelined manner in a network device includes a method of immediately executing an operation by a flow-specific instruction of each table while passing through each table constituting the flow table, and using a flow-specific directive as an operation set. There is a way to accumulate and execute the accumulated action set after passing through all the flow tables.
- 1 and 2 are conceptual diagrams for explaining a processing method of a pipelined flow table.
- FIG. 1 illustrates an output action 102 for a specific flow in the last nth table 101-n of a flow table composed of n tables 101-1, ..., 101-n. The case where the group output action 103 is executed is illustrated.
- FIG. 2 illustrates instructions accumulated in the operation set 104 after passing through the last n th table 101-n of a flow table composed of n tables 101-1,..., 101-n. The case where the output operation 105 or the group output operation 106 is performed is illustrated. Even within an operation set, the output operation or group output operation is executed last in priority.
- an output port is specified by an output operation or a group output operation, the packet is forwarded to the designated output port.
- an output port is specified, no other commands can be executed for that flow. In other words, there is no way to connect to other actions by using output port information.
- the flow processing method in order to solve the above-mentioned problem, in the flow processing method in the flow table consisting of a plurality of tables (n; n is a natural number of two or more) connected by a pipeline, the last table An egress table is introduced as (nth table).
- FIG. 3 is a conceptual diagram illustrating a flow processing method according to the present invention.
- the switch according to the present invention includes n-1 flow tables 301-1, 301-2,... And an output table 302 all connected by pipelines.
- the packet flowing into the switch passes from the first table 301-1 to the (n-1) th table 301- (n-1), and then processes the accumulated operation set 302, and then operates.
- the group output 303 or output operation 304 is executed last, and then via an egress table 305 before the final output.
- the output table may be reached by immediately executing the output operation or the group output operation as described above with reference to FIG. 1 without going through the operation set.
- the packet is finally output.
- VLAN ID tagging embodiment is first described as the most representative embodiment using an output-only table.
- FIG. 4 is a conceptual diagram illustrating an embodiment of tagging a VLAN ID using a flow processing method according to the present invention, and is an example of a method of processing an output table after an output operation of a flow table.
- the packet entering the switch 400 passes through the first flow table 410 and the second flow table 420, and finds a corresponding flow in a match field of each table to perform a corresponding action. Done.
- the switch after performing an output port action in the second flow table 420, the switch does not exit and passes through the output table 430.
- a corresponding 'push VLAN' operation is additionally performed according to the output port indicated in the second flow table, and then the packet is output. That is, 'Push VLAN1' operation is performed in the output table for packets designated to output port1, and 'Push VLAN2' operation is performed in the output table for packets designated to output port2. do.
- FIG. 5 is another conceptual diagram illustrating an embodiment of tagging a VLAN ID using a flow processing method according to the present invention, and is an example of a method of processing an output table after a group output operation of a group table.
- the packet entering the switch 500 passes through the first flow table 510 and the second flow table 520, and finds a corresponding flow in a match field of each table to perform a corresponding action.
- the second flow table 520 After performing a plurality of output port operations (ie, multicasting) defined in the group table 530 by the group command, the second flow table 520 passes through the output table 540.
- the port is additionally executed by the Push VLAN command, after which the packet is output from the switch 500.
- FIG. 6 is a conceptual diagram illustrating an embodiment of an output port change through flow counting using the flow processing method according to the present invention.
- the output port 1 operation is executed as it is and is transmitted to the output queues 630 without changing the output port (S640). ). However, if the counting for the flow exceeds a predetermined threshold, the output port for the packet is changed to the output port 2 (Output port 2) and transferred to the output queue 630 (S650).
- FIG. 7 is a conceptual diagram illustrating an embodiment of packet fragmentation using a flow processing method according to the present invention.
- the operation of the output port 1 is performed as it is and transferred to the output queue 730 without changing the packet size (S740). However, if the packet is larger than the MTU size, the packet is delivered to the output queue 730 after packet fragmentation (S750).
- FIG. 8 is a conceptual diagram illustrating a field configuration of an output table according to the present invention
- FIG. 9 is a conceptual diagram illustrating a match field structure of an output table.
- the output table may include match fields, priorities, counters, instructions, timeouts, and cookies. .
- the match field of the output table is configured in a format of repeated type-length-value (TLV) format.
- the type field includes a class (oxm_class), a field (oxm_field), and masking. It consists of whether (oxm_hasmask), the Length field is composed of the length (oxm_length), the Value field is composed of the actual matching value of the match field.
- the class (oxm_class) of the Type field is distinguished from the general match field classification by a separate division value, and accordingly, the operator (oxm_operator) is used in addition to simple matching by assigning an operator division (oxm_operator) to the Value field.
- the size comparison is possible.
- the size comparison method using the operator may be used in the flow counting embodiment illustrated in FIG. 6 or the packet segmentation embodiment illustrated in FIG. 7.
- FIG. 10 illustrates an example of using a match field using a wild card in an output table according to the present invention.
- 11 is an example for explaining an example of using a match field for size comparison in an output table according to the present invention.
- a comparison operator 'greater than (>)' is used to compare '1400> MTU size' to compare the packet size with the MTU size of output port 1. This is an example of using an expression. Instead of using oxm_bitmask, set oxm_operator to '>' and set the comparison value to oxm_value.
- flow counting in an output table may be enabled by defining and managing a counter 1210 for an egress table and a counter 1220 for an egress flow entry.
- FIG. 13 is a block diagram for explaining an embodiment of a network apparatus for performing a flow processing method according to the present invention.
- a network apparatus for performing a flow processing method may include a packet input unit 1310, a flow table storage unit 1320, a flow table processing unit 1330, and a packet output unit 1340. It can be configured to include.
- the packet input unit 1310 is a component that receives a packet of a flow from the outside.
- the flow table storage unit 1320 is a component that stores a plurality of (N; N is two or more natural numbers) flow tables.
- the last flow table of the plurality of flow tables necessarily includes an egress table described so far.
- the flow table storage unit 1320 may be implemented using various nonvolatile memory devices.
- the flow table processing unit 1330 is a component that performs processing based on the flow table stored in the flow table storage unit 1320 with respect to the packet introduced through the packet input unit 1310. At this time, the flow table processing unit 1330 outputs the N-only table indicated by the N-th table after passing through the N-th table from the first table to the packet input from the packet input unit 1310. The operation of the egress table is performed.
- an operation to be processed in the N th output dedicated table may be determined by the indicated output port.
- the packet output unit 1340 is a component for outputting the packet output from the flow table processing unit 1330 to the outside of the switch 1300.
Abstract
Description
Claims (14)
- 파이프라인으로 연결된 복수 개(N개; N은 2이상의 자연수)의 플로우 테이블에서 플로우 처리 방법에 있어서,In the flow processing method in a plurality (N; N is a natural number of two or more) flow table connected by a pipeline,상기 플로우의 유입된 패킷이 상기 복수 개의 테이블 중, 제1 테이블부터 제N-1번 테이블을 경유하는 단계;Inflowing the packet of the flow via the first to first N-1 tables of the plurality of tables;상기 패킷이 상기 N-1번째 테이블을 경유한 이후에, 상기 패킷에 대해 상기 N-1번째 테이블에 의해 지시되는 출력 전용 N번째 테이블(egress table)의 처리를 수행하는 단계; 및After the packet passes through the N−1 th table, performing processing of an output only N th table indicated by the N−1 th table for the packet; And상기 N번째 테이블의 처리 이후에 상기 패킷을 출력하는 단계를 포함한, 플로우 처리 방법.Outputting the packet after processing the N-th table.
- 청구항 1에 있어서,The method according to claim 1,상기 플로우 처리 방법은 소프트웨어 정의 네트워킹(Software Defined Networking)을 지원하는 네트워크 장비에서 수행되는 것을 특징으로 하는, 플로우 처리 방법.The flow processing method is characterized in that performed in a network equipment that supports Software Defined Networking.
- 청구항 1에 있어서,The method according to claim 1,상기 N-1번째 테이블을 경유한 이후에, 해당 플로우의 출력 포트(output port)가 지시되며, 상기 지시된 출력 포트에 의해서 상기 N번째 테이블에서 처리될 동작이 결정되는 것을 특징으로 하는, 플로우 처리 방법.After passing through the N-th table, an output port of the corresponding flow is indicated, and the operation to be processed in the N-th table is determined by the indicated output port. Way.
- 청구항 3에 있어서,The method according to claim 3,상기 출력 전용 N번째 테이블의 처리는 지시된 출력 포트로 출력될 플로우의 패킷에 대한 가상 로컬 에어리어 네트워크(VLAN; Virtual LAN) 태그(tag)의 부착을 포함하는 것을 특징으로 하는, 플로우 처리 방법.Processing of the output-only N-th table includes attaching a virtual local area network (VLAN) tag to packets of the flow to be output to the indicated output port.
- 청구항 3에 있어서,The method according to claim 3,상기 출력 전용 N번째 테이블의 처리는 지시된 출력 포트로 출력될 플로우에 대한 카운팅을 포함하는 것을 특징으로 하는, 플로우 처리 방법.Processing of the output-only N-th table includes counting for flows to be output to the indicated output ports.
- 청구항 5에 있어서,The method according to claim 5,상기 플로우에 대한 카운팅이 소정의 임계값과 동일하거나 초과하는 경우, 출력 포트의 변경을 수행하는 것을 특징으로 하는, 플로우 처리 방법.If the counting for the flow is equal to or exceeds a predetermined threshold, changing the output port.
- 청구항 3에 있어서,The method according to claim 3,상기 출력 전용 N번째 테이블의 처리는 지시된 출력 포트로 출력될 플로우의 패킷 사이즈를 소정의 임계값과 비교하여, 상기 패킷 사이즈가 소정의 임계값과 동일하거나 초과하는 경우, 상기 패킷에 대한 분할(fragmentation)을 수행하는 것을 특징으로 하는, 플로우 처리 방법.The processing of the output-only N-th table compares the packet size of the flow to be output to the indicated output port with a predetermined threshold, and if the packet size is equal to or exceeds the predetermined threshold, fragmentation).
- 외부로부터 플로우의 패킷을 입력받는 패킷 입력부;A packet input unit for receiving a packet of a flow from the outside;복수 개(N개; N은 2이상의 자연수)의 플로우 테이블을 저장하는 플로우 테이블 저장부;A flow table storage unit for storing a plurality of (N; N is two or more natural numbers) flow tables;상기 패킷 입력부로부터 입력된 패킷에 대하여, 상기 플로우 테이블 저장부에 저장된 상기 복수 개의 테이블 중, 제1 테이블부터 제N-1번 테이블을 경유한 이후에, 상기 N-1번째 테이블에 의해 지시되는 출력 전용 N번째 테이블(egress table)의 동작을 수행하는 플로우 테이블 처리부; 및An output indicated by the N-th table after passing through the N-th table from the first table, among the plurality of tables stored in the flow table storage unit, with respect to the packet input from the packet input unit. A flow table processor configured to perform an operation of a dedicated Nth table; And상기 플로우 테이블 처리부에서 상기 출력 전용 N번째 테이블의 처리를 완료한 이후에 상기 플로우의 패킷을 외부로 출력하는 패킷 출력부를 포함한 네트워크 장치.And a packet output unit configured to output a packet of the flow to the outside after the flow table processing unit has completed processing of the output-only Nth table.
- 청구항 8에 있어서,The method according to claim 8,상기 네트워크 장치는 소프트웨어 정의 네트워킹(Software Defined Networking)을 지원하는 네트워크 장치인, 네트워크 장치.The network device is a network device that supports Software Defined Networking.
- 청구항 8에 있어서,The method according to claim 8,상기 N-1번째 테이블을 경유한 이후에, 해당 패킷의 출력 포트(output port)가 지시되며, 상기 지시된 출력 포트에 의해서 상기 N번째 테이블에서 처리될 동작이 결정되는, 네트워크 장치.After passing through the N-th table, an output port of the corresponding packet is indicated, and the operation to be processed in the N-th table is determined by the indicated output port.
- 청구항 10에 있어서,The method according to claim 10,상기 출력 전용 N번째 테이블의 처리는 지시된 출력 포트로 출력될 패킷에 대한 가상 로컬 에어리어 네트워크(VLAN; Virtual LAN) 태그(tag)의 부착을 포함하는, 네트워크 장치.Processing of the output-only N-th table includes attaching a Virtual Local Area Network (VLAN) tag to a packet to be output to the indicated output port.
- 청구항 10에 있어서,The method according to claim 10,상기 출력 전용 N번째 테이블의 처리는 지시된 출력 포트로 출력될 플로우에 대한 카운팅을 포함하는, 네트워크 장치.Processing of the output-only N-th table includes counting for flows to be output to the indicated output port.
- 청구항 12에 있어서,The method according to claim 12,상기 플로우에 대한 카운팅이 소정의 임계값과 동일하거나 초과하는 경우, 출력 포트의 변경을 수행하는 것을 특징으로 하는, 네트워크 장치.If the counting for the flow is equal to or exceeds a predetermined threshold, changing the output port.
- 청구항 10에 있어서,The method according to claim 10,상기 출력 전용 N번째 테이블의 처리는 지시된 출력 포트로 출력될 플로우의 패킷 사이즈를 소정의 임계값과 비교하여, 상기 패킷 사이즈가 소정의 임계값과 동일하거나 초과하는 경우, 상기 패킷에 대한 분할(fragmentation)을 수행하는 것을 특징으로 하는, 네트워크 장치.The processing of the output-only N-th table compares the packet size of the flow to be output to the indicated output port with a predetermined threshold, and if the packet size is equal to or exceeds the predetermined threshold, performing fragmentation).
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