WO2014061587A1 - 制御装置、ノード、通信システム、通信方法及びプログラム - Google Patents
制御装置、ノード、通信システム、通信方法及びプログラム Download PDFInfo
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- WO2014061587A1 WO2014061587A1 PCT/JP2013/077763 JP2013077763W WO2014061587A1 WO 2014061587 A1 WO2014061587 A1 WO 2014061587A1 JP 2013077763 W JP2013077763 W JP 2013077763W WO 2014061587 A1 WO2014061587 A1 WO 2014061587A1
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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
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/02—Capturing of monitoring data
- H04L43/026—Capturing of monitoring data using flow identification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/38—Flow based routing
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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
- H04L47/11—Identifying congestion
Definitions
- the present invention is based on the priority claim of Japanese patent application: Japanese Patent Application No. 2012-227921 (filed on October 15, 2012), and the entire content of the application is incorporated herein by reference. Shall.
- the present invention relates to a control device, a node, a communication system, a communication method, and a program, and more particularly to a control device, a node, a communication system, a communication method, and a program that centrally control subordinate nodes.
- Non-Patent Documents 1 and 2 OpenFlow captures communication as an end-to-end flow and performs path control, failure recovery, load balancing, and optimization on a per-flow basis.
- the OpenFlow switch specified in Non-Patent Document 2 includes a secure channel for communication with the OpenFlow controller, and operates according to a flow table that is appropriately added or rewritten from the OpenFlow controller. In the flow table, for each flow, a set of match conditions (Match Fields) to be matched with the packet header, flow statistical information (Counters), and instructions (Instructions) that define the processing content is defined (non-patent) (Refer to section 4.1 “Flow Table” in Reference 2).
- the OpenFlow switch searches the flow table for an entry having a matching condition (see “4.3 Match Fields” in Non-Patent Document 2) that matches the header information of the received packet. If an entry that matches the received packet is found as a result of the search, the OpenFlow switch updates the flow statistical information (counter) and processes the processing (designated) in the instruction field of the entry for the received packet. Perform packet transmission, flooding, discard, etc. from the port. On the other hand, if no entry matching the received packet is found as a result of the search, the OpenFlow switch sends an entry setting request to the OpenFlow controller via the secure channel, that is, a control for processing the received packet. An information transmission request (Packet-In message) is transmitted. The OpenFlow switch receives a flow entry whose processing content is defined and updates the flow table. As described above, the OpenFlow switch performs packet transfer using the entry stored in the flow table as control information.
- a matching condition see “4.3 Match Fields” in Non-Patent Document 2
- the OpenFlow switch updates the flow statistical information
- a route control device (opened above) is set by changing a timer value (valid period) of a packet transfer rule (corresponding to the flow entry) set in each packet forwarding device (equivalent to the open flow switch).
- An invention is disclosed in which requests for packet transfer rules for a flow controller) are leveled to prevent an increase in load.
- FIG. 12 is a diagram showing a change in traffic volume and an open flow controller (OFC) load in a certain network.
- the traffic volume rapidly increases from the start time to a certain time, and thereafter changes within a certain range until the end time.
- the reason for the peak traffic volume occurring from the start time to a certain time is thought to be that employees and others start their own terminals and connect to specific servers and data centers all at once.
- the OpenFlow switch on the communication path receives a newly generated packet, it makes a flow entry setting request to the OFC. For this reason, as shown in FIG. 12, the load of the OFC changes along a curve similar to the traffic amount.
- the load peak of the OFC shown in FIG. 12 is merely an example, and a case where a load peak appears multiple times a day or a case where a load peak appears periodically due to the operation of a specific application is conceivable. In any case, if the number of connected terminals and the number of applications used increase, the load on the OFC increases.
- Patent Document 1 is effective against the loss of the flow entry due to timeout, but the load on the control device at the time of the first communication cannot be equalized.
- An object of the present invention is to provide a control device, a node, a communication system, a communication method, and a program for reducing a load peak of a control device of a centralized control type network represented by the above OpenFlow controller.
- a traffic information collection unit that collects traffic information for each flow from a control target node that performs packet processing in units of flows, and the traffic information is aggregated for each flow, so that an increase in traffic is expected.
- a traffic analysis unit that identifies a flow to be performed and a time zone, and control information for processing the identified flow to a node on a path of a flow that is expected to increase traffic in the identified time zone.
- a control device including a presetting unit configured to set in advance.
- a traffic information providing unit that transmits traffic information for each flow, a control information storage unit that holds control information received from the control device, and the control An entry selection / deletion unit that selects and deletes control information according to a predetermined rule when a predetermined number of pieces of preset control information generated based on traffic information transmitted to the control device is included in the information; are provided.
- a communication system including the control device described above and a node that transmits the traffic information to the control device and operates according to the control information received from the control device.
- a control device that controls a node that performs packet processing in units of flows collects traffic information for each flow from the nodes, and aggregates the traffic information for each flow, A step of specifying a flow and a time zone in which the increase is expected, and control information for processing the specified flow in a node on a path of a flow in which traffic increase is expected in the specified time zone Pre-setting the communication method.
- This method is associated with a specific machine called a control device that controls a node on the network.
- a computer that constitutes a control device that controls a node that performs packet processing in units of flows, a process of collecting traffic information for each flow from the nodes, The traffic information is aggregated for each flow, a process for specifying a flow and a time zone in which traffic increase is expected, and a node on the path of the flow in which traffic increase is expected in the specified time zone
- a program for executing a process for setting control information for processing the identified flow in advance can be recorded on a computer-readable (non-transient) storage medium. That is, the present invention can be embodied as a computer program product.
- the present invention can be realized by a configuration including a node 10A arranged on a network and a control device 20A that controls the node 10A.
- the node 10A in response to a request from the control device 20A, a traffic information providing unit 101 that transmits traffic information for each flow, a control information storage unit 103 that holds control information received from the control device 20A, and a control information storage A packet processing unit 102 that processes the received packet with reference to the control information held in the unit 103.
- a communication device having a function of recording the traffic amount for each flow and transmitting it to the OpenFlow controller, such as the open flow switch of Non-Patent Documents 1 and 2, can be used.
- the OpenFlow controller such as the open flow switch of Non-Patent Documents 1 and 2
- other devices may be used as long as they have equivalent functions.
- the control device 20A includes a traffic information collection unit 201 that collects traffic information for each flow from the node 10A to be controlled, and aggregates the traffic information for each flow to obtain a flow and a time zone in which traffic increase is expected.
- Such a control device 20A can be realized by adding a traffic analysis unit 202 and a pre-setting unit 203 to the open flow controller of Non-Patent Documents 1 and 2.
- FIG. 2 is a diagram illustrating the operation of the control device 20A.
- the control device 20A of the present embodiment Based on the traffic information collected by the traffic information collection unit 201, the control device 20A of the present embodiment identifies a flow and a time zone in which traffic increase is expected (peak discovery). Then, the pre-setting unit 203 sets in advance control information for processing the specified traffic to the node 10A on the flow path (control information pre-distribution). Thereafter, even when the user's communication start time reaches its peak, generation of a control information generation request for processing a received packet from the node 10A to the control device 20 is suppressed. This is because a node for which control information has been set in advance can process a received packet using the control information that has been set in advance, and therefore does not make a control information generation request.
- FIG. 3 is a diagram illustrating the configuration of the communication system according to the first embodiment of this invention. Referring to FIG. 3, similarly to FIG. 1, a configuration including a node 10 arranged on a network and a control device 20 that controls the node 10 is shown.
- the control device 20 includes a traffic information collection unit 201, a traffic analysis unit 202, a pre-setting unit 203, and an on-demand setting unit 204.
- the traffic information collection unit 201 inquires the value of the flow statistics information (Counters) field of each entry held in the control information storage unit 103 to the traffic information providing unit 101 of the node 10 at a predetermined time interval. Collect traffic information. For collecting such traffic information, the Read State message of Non-Patent Document 2 that inquires the contents of the flow table to the switch can be used (see “A.3.6 Read State Message” of Non-Patent Document 2).
- the Read State message of Non-Patent Document 2 that inquires the contents of the flow table to the switch can be used (see “A.3.6 Read State Message” of Non-Patent Document 2).
- the traffic analysis unit 202 aggregates the traffic information collected from each terminal, aggregates the traffic amount per flow per hour, and sets a plurality of flows that increase the traffic amount in the peak time period as the flow to be preset in the control information. select.
- a node having a high peak value of traffic in a peak time zone may be selected in order from the top, or traffic in a peak time zone may be selected. You may select a thing with a large total amount in order from a high-order.
- other methods such as a method of calculating the sum of traffic on the route of each flow and selecting in order from the top (the more the number of hops, the easier it is to select) reduce the load on the control device. It is also possible to adopt a method for selecting a flow having a high effect.
- the pre-setting unit 203 sets in advance control information (flow entry) for processing the specified traffic to a node on a flow path in which the traffic volume increases in a certain time zone.
- control information flow entry
- the node to which the control information (flow entry) is set may be specified using the node information obtained at the time of traffic information collection, or may be determined from the network topology as shown in FIG. . At this time, when several flows having common destinations can be aggregated, the flows can be aggregated.
- the pre-setting unit 203 performs an operation of setting the pre-set type control information (flow entry) until the control information storage unit 103 of the node 10 runs out of storage space in the control information. And By doing so, hitting pre-set type control information (flow entry) at the time of traffic peak increases, so the load reduction effect is increased.
- the presetting unit 203 sets the preset type control information (flow entry) so that the node 10 does not delete it due to timeout. By doing so, the preset control information (flow entry) is not inadvertently deleted due to a time-out at the time of a traffic peak, thereby increasing the load reduction effect.
- the on-demand setting unit 204 creates control information (flow entry) and transmits it to the node 10 in response to a transmission request for control information (flow entry) from the node.
- the node 10 includes a traffic information providing unit 101, a control information storage unit 103, a packet processing unit 102, and an entry selection / deletion unit 104.
- a traffic information providing unit 101 a control information storage unit 103
- a packet processing unit 102 a packet processing unit 102
- an entry selection / deletion unit 104 an entry selection / deletion unit 104.
- the control information storage unit 103 is configured by a table or the like that holds control information (flow entry) transmitted from the control device 20.
- control information (flow entry) set in advance by the pre-setting unit 203 and the on-demand type set by the transmission request for control information (flow entry) from the node 10 to the control device 20 are used.
- the control information (flow entry) is not particularly distinguished, but a flag or the like may be provided and managed separately. In this way, for example, for on-demand type control information (flow entry), aging processing (deletion due to timeout) is performed for a certain period of time, etc., and for preset type control information (flow entry), It is possible to manage such that it is not subject to aging processing (deletion due to timeout).
- the packet processing unit 102 When the packet processing unit 102 receives a packet from another node or terminal, the packet processing unit 102 searches the control information storage unit 103 for an entry having a matching condition that matches the received packet. As a result of the search, when an entry having a matching condition that matches the received packet is found, the packet processing unit 102 executes the processing content stored in the instruction field of the entry. At this time, the packet processing unit 102 updates the value of the flow statistical information (Counters) field of the corresponding entry.
- Counters flow statistical information
- the packet processing unit 102 sends the received packet or information extracted from the received packet to the on-demand setting unit 204 of the control device 20. To request transmission of a flow entry for processing the received packet.
- the traffic information providing unit 101 reads the value of the flow statistics information (Counters) field from the entry of the control information storage unit 103 in response to a request from the control device 20, and transmits the value to the control device 20.
- Counters flow statistics information
- the entry selection / deletion unit 104 is to be deleted from the preset type control information (flow entry) held in the control information storage unit 103 when the control information storage unit 103 has no storage area for control information.
- the control information (flow entry) is selected and deleted.
- the pre-setting unit 203 of the control device 20 sets the pre-set type control information (flow entry) until the control information storage unit 103 of the node 10 runs out of storage space in the control information.
- the entry selection / deletion unit 104 performs a control information (flow entry) replacement operation.
- an LRU Least Recently Used
- LFU Least Frequently Used
- the control information storage unit 103 is provided with a field for recording an elapsed time since the last use (hit).
- the idle timeout value held by the flow entry of Non-Patent Document 2 can also be used. In this case, as shown in FIG. 9, the entry having the longest elapsed time since the last use (hit) is selected.
- the initial value of the elapsed time since the last use may be changed based on the flow statistical information. For example, if there is control information (flow entry) A used 10 times the previous day and control information (flow entry) B used 100 times the previous day, the initial value of the control information (flow entry) A is 100 seconds, Different values can be set such that the initial value of the control information (flow entry) B is 10 seconds. Thus, by shortening the initial value of a frequently used entry, it is possible to make it difficult for a frequently used entry to be evicted in the initial state.
- the initial value of the number of times of use may be determined based on the flow statistical information. For example, if there is control information (flow entry) A used 10 times on the previous day and control information (flow entry) B used 100 times on the previous day, the initial value of the usage count is set to 10 times and 100 times, respectively. In this way, it is possible to prevent a frequently used entry from being evicted in the initial state.
- a timeout value longer than the timeout value set in on-demand control information (flow entry) is set and replaced by aging.
- the example may be simply replaced by FIFO (First In First ⁇ ⁇ ⁇ ⁇ Out).
- control device and each unit (processing means) of the node shown in FIG. 3 can also be realized by a computer program that causes the computers constituting these devices to execute the above-described processes using the hardware thereof. .
- FIG. 4 is a diagram showing the operation of the communication system according to the first exemplary embodiment of the present invention.
- the control device 20 collects traffic information from the node 10 as shown in FIG. 5 (steps S001 and S101).
- control device 20 analyzes the collected traffic information (step S002) and determines whether it is necessary to preset control information (flow entry) (step S003). As a result, when it is determined that the control information needs to be preset, the control device 20 generates control information (flow entry) for presetting and sets it in a node on the route (step S004).
- FIG. 6 is a diagram illustrating a state in which flows A, B, and C are specified as the preset target flows in which traffic rapidly increases in a certain time zone.
- FIG. 7 is a diagram showing a state in which control information (flow entry) for processing the flow A, flow B, and flow C is set.
- the node 10 that has received the request for setting the control information checks whether or not there is a free area in the control information storage unit 103 (step S102), and if there is a free area, the control information storage unit 103 The control information (flow entry) that has received the setting request is stored (step S103).
- the node 10 selects the replacement target control information (flow entry) by the entry selection / deletion unit 104 and performs the replacement (step S104).
- FIG. 8 is a diagram illustrating an operation example of the control device 20 after the flow to be preset is specified as described above.
- the control information (flow entry) pre-setting operation is started from the time before the start time when the traffic volume reaches its peak. For this reason, the load in the time before the start work time has increased compared with the time of prior distribution non-execution. Instead, it has succeeded in reducing the load at the peak of traffic after the opening hours.
- control information (flow entry) is set from the control device 20 in response to the occurrence of a new flow. Since there is no free area in the unit 103, control information (flow entry) replacement control is performed using a predetermined rule such as LRU or LFU.
- the control device 20 similarly performs the replacement operation after the preset operation of the control information (flow entry) from the time before the start time, and the load reduction control of the control device 20 is continued.
- the flow of the preset target on the first day and the second day may be different.
- the replacement operation is performed after the preset operation of the control information (flow entry).
- the control device 20 may issue an instruction to delete preset control information (flow entry). By doing so, it is possible to reduce control information (flow entry) held in the node 10 at times other than the peak time of traffic.
- control information (flow entry) is set until there is no free space in the control information storage unit 103.
- the above-described setting of the on-demand type control information (flow entry) is performed. If necessary, a certain area may be allocated for on-demand control information.
- control information (flow entry) is pre-set based on the change in traffic volume in a day.
- the pre-set type can be set in a longer span such as a week or a month.
- the necessity of setting control information (flow entry) may be determined and set. In this way, it is possible to reduce the load due to traffic peaks during a long period such as a specific day of the week, the beginning of the month, or the end of the month. For example, when communication with a specific server is concentrated on a specific day of the month, control information (flow entry) for processing communication with the server is set in advance, so that the load on the control device 20 is increased. Can be reduced.
- control information (flow entry) may be determined and set in a shorter span such as one to several hours. In this way, it is possible to reduce the load due to periodic traffic peaks such as every few minutes or every few tens of minutes. For example, when communication with a specific server is concentrated every 10 minutes, control information (flow entry) for processing communication with this server is set in advance to reduce the load on the control device 20. can do.
- the entry selection / deletion unit 104 is provided on the node 10 side.
- the entry selection / deletion unit 104 may be deleted from the node 10.
- the control device 20 may execute replacement processing of preset control information (flow entry).
- the control device 20 may set a timeout value to some preset control information (flow entry) selected from preset control information (flow entry), and automatically delete it on the node 10 side. Implementation is possible.
- the traffic information collection unit 201 and the traffic analysis unit 202 are described as being installed in the control device 20, but functions corresponding to the traffic information collection unit 201 and the traffic analysis unit 202 are provided. It is also possible to prepare another device and to configure the control device 20 with a plurality of devices. In this case, the control device 20 receives the traffic analysis result from the other device and presets the control information (flow entry).
- the traffic analysis unit specifies a plurality of flows that are expected to increase in traffic for each time period
- the said presetting part is a control apparatus which sets the some control information for processing the said some specified traffic to the said node.
- the traffic analysis unit is a control device that selects a plurality of flows having a high maximum traffic volume from a higher level in a specific time zone in one or a plurality of nodes.
- the traffic analysis unit is a control device that selects a plurality of flows having a large total amount of traffic in a specific time zone from a higher level in one or a plurality of nodes.
- the said presetting part is a control apparatus which replaces the control information selected using the predetermined rule, and the said new control information, when setting new control information.
- Traffic information providing unit 102 Packet processing unit 103
- Control information storage unit 104 Entry selection / deletion unit 201
- Traffic analysis unit 203 Pre-setting unit 204
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Abstract
Description
本発明は、日本国特許出願:特願2012-227921号(2012年10月15日出願)の優先権主張に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
本発明は、制御装置、ノード、通信システム、通信方法及びプログラムに関し、特に、配下のノードを集中制御する制御装置、ノード、通信システム、通信方法及びプログラムに関する。
前記トラヒック情報をフロー毎に集計して、トラヒックの増大が予想されるフローと時間帯とを特定する処理と、前記特定した時間帯に、トラヒックの増大が予想されるフローの経路上にあるノードに、前記特定したフローを処理するための制御情報を事前に設定する処理と、を実行させるプログラムが提供される。なお、このプログラムは、コンピュータが読み取り可能な(非トランジエントな)記憶媒体に記録することができる。即ち、本発明は、コンピュータプログラム製品として具現することも可能である。
続いて、本発明の第1の実施形態について図面を参照して詳細に説明する。図3は、本発明の第1の実施形態の通信システムの構成を示す図である。図3を参照すると、図1と同様に、ネットワーク上に配置されたノード10と、ノード10を制御する制御装置20と、を含む構成が示されている。
[第1の形態]
(上記第1の視点による制御装置参照)
[第2の形態]
前記トラヒック解析部は、時間帯毎に、トラヒックの増大が予想されるフローを複数特定し、
前記事前設定部は、前記ノードに、前記特定した複数のトラヒックを処理するための複数の制御情報を設定する制御装置。
[第3の形態]
前記トラヒック解析部は、1又は複数のノードにおいて、特定の時間帯に、トラヒック量の最大値が高いフローを上位から複数選択する制御装置。
[第4の形態]
前記トラヒック解析部は、1又は複数のノードにおいて、特定の時間帯におけるトラヒック量の総量が大きいフローを上位から複数選択する制御装置。
[第5の形態]
前記ノードにおいてタイムアウトによる削除が行われないように前記制御情報を設定する制御装置。
[第6の形態]
前記事前設定部は、新しい制御情報を設定する際に、所定のルールを用いて選択した制御情報と前記新しい制御情報とを入れ替える制御装置。
[第7の形態]
(上記第2の視点によるノード参照)
[第8の形態]
(上記第3の視点による通信システム参照)
[第9の形態]
(上記第4の視点による通信方法参照)
[第10の形態]
(上記第5の視点によるプログラム参照)
なお、上記第7~第10の形態は、第1の形態と同様に、第2~第6の形態に展開することが可能である。
20、20A 制御装置
101 トラヒック情報提供部
102 パケット処理部
103 制御情報記憶部
104 エントリ選択削除部
201 トラヒック情報収集部
202 トラヒック解析部
203 事前設定部
204 オンデマンド設定部
Claims (18)
- フロー単位でパケット処理を行う制御対象のノードからフロー毎のトラヒック情報を収集するトラヒック情報収集部と、
前記トラヒック情報をフロー毎に集計して、トラヒックの増大が予想されるフローと時間帯とを特定するトラヒック解析部と、
前記特定した時間帯に、トラヒックの増大が予想されるフローの経路上にあるノードに、前記特定したフローを処理するための制御情報を事前に設定する事前設定部と、
を備える、制御装置。 - 前記トラヒック解析部は、時間帯毎に、トラヒックの増大が予想されるフローを複数特定し、
前記事前設定部は、前記ノードに、前記特定した複数のフローを処理するための複数の制御情報を設定する、請求項1に記載の制御装置。 - 前記トラヒック解析部は、1又は複数のノードにおいて、特定の時間帯に、トラヒック量の最大値が高いフローを上位から複数選択する、請求項2に記載の制御装置。
- 前記トラヒック解析部は、1又は複数のノードにおいて、特定の時間帯におけるトラヒック量の総量が大きいフローを上位から複数選択する、請求項2に記載の制御装置。
- 前記事前設定部は、前記ノードにおいてタイムアウトによる削除が行われないように前記制御情報を設定する、請求項1ないし4のいずれか1項に記載の制御装置。
- 前記事前設定部は、新しい制御情報を設定する際に、所定のルールを用いて選択した制御情報と前記新しい制御情報とを入れ替える、請求項1ないし5のいずれか1項に記載の制御装置。
- 制御装置からの要求に応じて、フロー毎のトラヒック情報を送信するトラヒック情報提供部と、
前記制御装置から受信した制御情報を保持する制御情報記憶部と、
前記制御情報のうち、前記制御装置に送信したトラヒック情報に基づいて生成された事前設定型の制御情報が所定の数になった場合、前記事前設定型の制御情報の中から所定のルールにより制御情報を選択して削除するエントリ選択削除部と、
を備える、ノード。 - 請求項1ないし6のいずれか1項に記載の制御装置に対して前記トラヒック情報を送信するトラヒック情報提供部と、
前記制御装置から受信した制御情報に従ってパケットを処理するパケット処理部と、を備える、ノード。 - 前記制御装置から受信した制御情報を保持する制御情報記憶部と、
前記制御情報のうち、前記制御装置に送信したトラヒック情報に基づいて生成された事前設定型の制御情報が所定の数になった場合、前記事前設定型の制御情報の中から所定のルールにより制御情報を選択して削除するエントリ選択削除部と、
を備える、請求項8に記載のノード。 - 前記エントリ選択削除部は、前記事前設定型の制御情報の中から、制御情報の使用状況に応じて制御情報を選択して削除する、請求項7または9に記載のノード。
- 請求項1ないし6のいずれか1項に記載の制御装置と、
前記制御装置に対して前記トラヒック情報を送信するとともに、前記制御装置から受信した制御情報に従って動作するノードと、を備える、通信システム。 - フロー単位でパケット処理を行うノードを制御する制御装置が、
前記ノードからフロー毎のトラヒック情報を収集する収集ステップと、
前記トラヒック情報をフロー毎に集計して、トラヒックの増大が予想されるフローと時間帯とを特定する特定ステップと、
前記特定した時間帯に、トラヒックの増大が予想されるフローの経路上にあるノードに、前記特定したフローを処理するための制御情報を事前に設定する設定ステップと、
を含む、通信方法。 - 前記特定ステップにおいて、時間帯毎に、トラヒックの増大が予想されるフローを複数特定し、
前記設定ステップにおいて、前記ノードに、前記特定した複数のフローを処理するための複数の制御情報を設定する、請求項12に記載の通信方法。 - 前記特定ステップにおいて、1又は複数のノードにおいて、特定の時間帯に、トラヒック量の最大値が高いフローを上位から複数選択する、請求項13に記載の通信方法。
- 前記特定ステップにおいて、1又は複数のノードにおいて、特定の時間帯におけるトラヒック量の総量が大きいフローを上位から複数選択する、請求項13に記載の通信方法。
- 前記設定ステップにおいて、前記ノードにおいてタイムアウトによる削除が行われないように前記制御情報を設定する、請求項13ないし15のいずれか1項に記載の通信方法。
- 前記設定ステップにおいて、新しい制御情報を設定する際に、所定のルールを用いて選択した制御情報と前記新しい制御情報とを入れ替える、請求項12ないし16のいずれか1項に記載の通信方法。
- フロー単位でパケット処理を行うノードを制御する制御装置を構成するコンピュータに、
前記ノードからフロー毎のトラヒック情報を収集する処理と、
前記トラヒック情報をフロー毎に集計して、トラヒックの増大が予想されるフローと時間帯とを特定する処理と、
前記特定した時間帯に、トラヒックの増大が予想されるフローの経路上にあるノードに、前記特定したフローを処理するための制御情報を事前に設定する処理と、
を実行させる、プログラム。
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