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WO2011118575A1 - Système de communication, dispositif de contrôle et procédé de surveillance de trafic - Google Patents

Système de communication, dispositif de contrôle et procédé de surveillance de trafic Download PDF

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Publication number
WO2011118575A1
WO2011118575A1 PCT/JP2011/056822 JP2011056822W WO2011118575A1 WO 2011118575 A1 WO2011118575 A1 WO 2011118575A1 JP 2011056822 W JP2011056822 W JP 2011056822W WO 2011118575 A1 WO2011118575 A1 WO 2011118575A1
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WIPO (PCT)
Prior art keywords
packet
forwarding node
statistical information
control device
processing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/056822
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English (en)
Japanese (ja)
Inventor
栄一 溝口
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NEC Corp
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NEC Corp
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Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of WO2011118575A1 publication Critical patent/WO2011118575A1/fr
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Ceased legal-status Critical Current

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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
    • 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
    • H04L43/20—Arrangements for monitoring or testing data switching networks the monitoring system or the monitored elements being virtualised, abstracted or software-defined entities, e.g. SDN or NFV
    • 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
    • H04L45/02—Topology update or discovery

Definitions

  • the present invention is based on the priority claim of Japanese Patent Application: Japanese Patent Application No. 2010-068904 (filed on Mar. 24, 2010), the entire contents of which are incorporated herein by reference. Shall.
  • the present invention relates to a communication system, a control device, and a traffic monitoring method, and more particularly to a communication system, a control device, and a traffic monitoring method including a forwarding node that processes a received packet according to a processing rule that matches the received packet.
  • 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 that functions as a forwarding node includes a secure channel for communication with the OpenFlow controller positioned as a control device, and operates according to a flow table that is appropriately added or rewritten from the OpenFlow controller.
  • a flow table for each flow, a set of a matching rule (header field) for matching with a packet header, an action (Action) that defines the processing content, and flow statistical information (counter) is defined (see FIG. 8). ).
  • the OpenFlow switch when it receives a packet, it searches the flow table for an entry having a matching rule (see the header field in FIG. 8) that matches the header information of the received packet. When 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 executes the processing contents described in the action field of the entry on the received packet. To do. On the other hand, if no entry matching the received packet is found as a result of the search, the OpenFlow switch forwards the received packet to the OpenFlow controller via the secure channel, and the source / destination of the received packet. To request the determination of the route of the packet based on the above, receive the flow entry that realizes this, and update the flow table. As described above, the OpenFlow switch performs packet transfer using an entry stored in the flow table as a processing rule.
  • the OpenFlow controller has a function of collecting flow statistical information (counter) that is updated each time a packet is processed (visualization function).
  • Non-Patent Document 3 introduces a technique called “sFlow” for performing network traffic sampling.
  • Non-Patent Documents 1 to 3 are incorporated herein by reference. The following analysis was made by the present inventors.
  • the no. Of FIG. 1 to 3 are examples of flow entries (processing rules) set in the open flow switch (OFS2) in FIG. no. 1 flow entry has a source IP address of 10.10.10. An action for outputting a packet received from A from port number # 0 (GBE0 / 3) is defined.
  • the source IP address 10.10.10. B port # 8000
  • 10.10.10 An action for outputting a packet received from B (port # 8080) from port number # 0 (GBE0 / 3) is defined.
  • the flow entries 1 to 3 can be combined into a single flow entry as shown in FIG. 9B, thereby efficiently using the storage area and processing capacity of the flow entry in the open flow switch (OFS2). It is possible to do.
  • OFS2 open flow switch
  • the statistical information (“counter” in FIGS. 8 and 10) for each flow entry that can be acquired by the open flow switch (OFS2) is also combined into one.
  • OFS2 open flow switch
  • Non-Patent Document 3 it is conceivable to implement sFlow, “NetFlow”, port mirroring, etc. of Non-Patent Document 3 in individual OpenFlow switches.
  • the constant use of these technologies causes a heavy CPU load on the OpenFlow switch, There is a problem that the throughput of the entire network is lowered.
  • the present invention has been made in view of the above circumstances, and the object of the present invention is to request that the number of processing rules (flow entries) held by each forwarding node be as small as possible, It is an object of the present invention to provide a communication system, a control device, and a traffic monitoring method that can satisfy both requests for grasping flowing traffic.
  • a plurality of forwarding nodes including a packet processing unit that performs processing of a received packet using a processing rule that matches the received packet and that collects statistics of the packet to which the processing rule is applied; Based on the statistical information of the packets collected from each forwarding node, the specific forwarding node starts analyzing the packet that is the target of the statistical information, and receives the analysis result from the specific forwarding node. And a control device that outputs the data.
  • a plurality of forwarding nodes including a packet processing unit that performs processing of a received packet using a processing rule that matches the received packet and that takes statistics of the packet to which the processing rule is applied; Based on the statistical information of the packets that are connected and collected from each forwarding node, the specific forwarding node starts analyzing the packet that is the target of the statistical information, and the analysis result is sent from the specific forwarding node.
  • a control device for receiving and outputting is provided.
  • a plurality of forwarding nodes including a packet processing unit that performs processing of a received packet using a processing rule that matches the received packet and that takes statistics of the packet to which the processing rule is applied;
  • a program that is executed by a computer that configures a connected control device and that collects packet statistical information from each forwarding node and a specific forwarding based on the packet statistical information collected from each forwarding node
  • This program can be recorded on a computer-readable storage medium. That is, the present invention can be embodied as a computer program product.
  • a plurality of forwarding nodes including a packet processing unit that performs processing of a received packet using a processing rule that matches the received packet and that takes statistics of the packet to which the processing rule is applied;
  • the connected control device collects the statistical information of the packet from each of the forwarding nodes, and based on the statistical information of the packet collected from each of the forwarding nodes, becomes a target of the statistical information to a specific forwarding node.
  • a traffic monitoring method including a step of starting an analysis of a received packet and a step of receiving and outputting the analysis result from the specific forwarding node. The method is tied to a specific machine, a control device that controls the forwarding node.
  • the present invention it is possible to satisfy both a request for reducing the number of processing rules (flow entries) held by each forwarding node as much as possible and a request for grasping traffic flowing in the network. . This is because a forwarding node that performs detailed traffic monitoring is specified based on the statistical information of the processing rules, and a stepwise configuration is adopted in which traffic analysis is performed.
  • FIG. 6 It is a block diagram for demonstrating the structure of the 1st Embodiment of this invention. It is a sequence diagram for demonstrating the operation
  • the communication system performs processing of received packets using processing rules that match the received packets, and includes a plurality of packet processing units that take statistics of packets to which the processing rules are applied.
  • Transfer nodes OFS; OpenFlow switch
  • OFC OpenFlow controller
  • the control device 20 causes the specific forwarding node to start analyzing the passing packet based on the packet statistical information collected from each forwarding node 10A to 10C, and receives the analysis result of the passing packet from the specific forwarding node. And output. For example, when there is an abnormality in the statistical information of the packet collected from the forwarding node 10A, the control device 20 causes the forwarding node 10A to start detailed analysis of the packet that is the target of the statistical information and receive the result ⁇ Output.
  • the detailed analysis result of the packet can be used to identify the cause of abnormal traffic and to implement countermeasures (packet discard, route change) in the upstream forwarding nodes 10A to 10C causing the abnormal traffic.
  • FIG. 1 is a block diagram for explaining the configuration of the first embodiment of the present invention.
  • a terminal 30 three forwarding nodes 10A to 10C (OFS1 to OFS3), a control device (OFC) 20, a server 40A, and a server 40B are shown.
  • the control device (OFC) 20 is connected to the transfer nodes 10A to 10C (OFS1 to OFS3) via a dedicated secure channel, and sets a flow entry as a processing rule in the transfer nodes 10A to 10C (OFS1 to OFS3). It has a function.
  • the OpenFlow controller and OpenFlow switch of Non-Patent Documents 1 and 2 the setting of the flow entry and the collection of statistical information to be described later are performed using the OpenFlow protocol.
  • the forwarding node 10A searches for a processing rule storage unit 11 that stores a flow entry as a processing rule, and a processing rule that matches the received packet from the processing rule storage unit 11, and determines the processing content defined in the processing rule.
  • the packet processing unit 12 to be executed and the packet sampling processing unit that starts sampling of the passing packet based on an instruction from the sampling data analysis unit 23 of the control device (OFC) 20 and transmits the result to the control device (OFC) 20 13. Further, the packet processing unit 12 has a function of requesting the control device (OFC) 20 to set a processing rule when there is no processing rule that matches the received packet in the processing rule storage unit 11.
  • the forwarding node 10B (OFS2) and the forwarding node 10C (OFS3) are also assumed to have the same configuration as the forwarding node 10A (OFS1).
  • Such a forwarding node can be realized by mounting the sFlow agent of Non-Patent Document 3 on the OpenFlow switch of Non-Patent Documents 1 and 2.
  • the control device (OFC) 20 creates a processing rule in response to a processing rule setting request from the packet processing unit of the forwarding nodes 10A to 10C (OFS1 to OFS3), and each of the forwarding nodes 10A to 10C (OFS1 to OFS3).
  • a statistical information collection unit 22 that requests statistical information of packets to which the processing rules are applied, from the packet processing units of the forwarding nodes 10A to 10C (OFS1 to OFS3), Based on the information, the sampling data analysis unit 23 that instructs the packet sampling processing unit of the specific forwarding nodes 10A to 10C (OFS1 to OFS3) to start the packet sampling (sFlow setting) and receives the result.
  • Such a control device can be realized by mounting the sFlow diagram analysis function (sFlow collector) of Non-Patent Document 3 on the OpenFlow controllers of Non-Patent Documents 1 and 2.
  • the control device (OFC) 20 holds network topology information, transfer node configuration information, and set flow information (flow entry information).
  • a processing rule is created by referring to it. For example, by referring to the network topology information, using the Dijkstra method, etc., create a route with the minimum hop, and set processing rules for realizing the route to each forwarding node on the route, so that each flow Route control can be performed.
  • Each unit (processing means) of the control device (OFC) 20 shown in FIG. 1 is executed by a computer program that causes a computer constituting the control device (OFC) 20 to execute the above-described processes using the hardware. Can be realized.
  • FIG. 2 is a sequence diagram for explaining the operation of the first exemplary embodiment of the present invention.
  • the control device (OFC) 20 assigns each processing rule to the packet processing units of the forwarding nodes 10A to 10C (OFS1 to OFS3) at a predetermined timing such as a fixed time interval and a predetermined time. Request the statistical information of the applied packets and collect the responses (see Step S001; page 9 “Read-State” of Non-Patent Document 2).
  • control device (OFC) 20 determines whether an abnormality has occurred based on the collected statistical information. In this determination, either the number of received bytes or the number of packets included in the statistical information received from each of the forwarding nodes 10A to 10C (OFS1 to OFS3), or an index calculated using both of them is determined. This can be done depending on whether or not the threshold is exceeded.
  • the control device (OFC) 20 uses the forwarding node 10B (OFS2). ) Is set for a processing rule exceeding a predetermined threshold value, and packet sampling and counting are instructed (step S003).
  • traffic sampled by sFlow information on the header field of the processing rule in which an abnormality has been observed is used, and the port (output port: GBE0 / 1) and the destination IP address (10.10.10.X)
  • the sampling conditions can be specified and the traffic to be sampled can be minimized.
  • the forwarding node 10B Upon receipt of the instruction, the forwarding node 10B (OFS2) transmits a packet sampling result (analysis result) to the control device (OFC) 20 under the designated condition (step S004).
  • the result of sampling the packet (analysis result) is transmitted, for example, in the form of an sFlow datagram.
  • the sFlow datagram with a large amount of communication is analyzed to identify the one with the largest amount of communication. Can do. Furthermore, since upper protocol information equivalent to tcpdump is obtained from the sFlow datagram, it is possible to identify an abnormal application from the analysis result.
  • the control device (OFC) 20 uses the transfer node (ingless OFS; transfer node 10A (OFS1) in FIG. 5) located at the start point of the abnormal flow or the flow used by the abnormal application.
  • a processing rule (flow entry) for executing packet discard for the corresponding flow is set (step S005).
  • OFS2 forwarding node 10B
  • the processing rule (flow entry) for executing packet discarding has been described. However, any processing that suppresses the transfer of packets belonging to an abnormal flow may be used. A method of setting a processing rule (flow entry) that defines an action to be changed or an action to change a transfer route, or a method of sending a packet for ending communication can also be adopted.
  • the processing rule (flow entry) is set for the forwarding node (ingress OFS; forwarding node 10A (OFS1) of FIG. 5) located at the start point of the flow.
  • Set processing rules (flow entry) that cause other forwarding nodes on the upstream side of the path where the packet is generated to suppress packet forwarding such as packet discard or forwarding priority change, or send packets that terminate communication It is also possible to deal with.
  • the present embodiment it is possible to obtain an analysis result of abnormal traffic and take measures without impairing the performance of the entire network.
  • the reason for this is that a low-load traffic monitor that uses statistical information in the processing rules (flow entry) is regularly performed, and when an abnormality occurs, a detailed traffic analysis is performed locally to perform step-by-step monitoring. It is in having adopted.
  • FIG. 6 is a block diagram for explaining the configuration of the second embodiment of the present invention.
  • the difference from FIG. 1 showing the configuration of the first embodiment is that the forwarding nodes 10A to 10c (OFS1 to OFS3) of the forwarding nodes 10A to 10C (OFS1 to OFS3) are omitted, and the sampling data analysis unit 23.
  • the control device (OFC) 20a in which is omitted is used.
  • the sampling data analysis unit 23 of the control device (OFC) 20 selects specific forwarding nodes 10A to 10C (OFS1 to OFS1 to OFS1) based on statistical information received from the forwarding nodes 10A to 10C (OFS1 to OFS3).
  • the packet sampling processing unit of OFS3) is instructed to start packet sampling (sFlow setting) and receives the result.
  • the processing rule creation unit 21a as shown in FIG.
  • Statistical information (xxx-1, xxx-2, xxx-3 in FIG. 7) is collected by setting a plurality of subdivided processing rules (flow entries) for detailed analysis of packets.
  • a plurality of subdivided processing rules (flow entries) can be created from history information when a plurality of processing rules (flow entries) are aggregated on the control device (OFC) 20 side. it can. Moreover, it is good also as what is subdivided using the network topology information which the control apparatus (OFC) 20 hold

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

La présente invention se rapporte à un système de communication qui est apte à répondre à la fois à une exigence de minimiser le nombre de règles de traitement (entrées de flux) entretenues par des nœuds de transfert individuels, et à une exigence d'obtenir une image précise du trafic qui circule au sein d'un réseau. Le système de communication selon l'invention comprend une pluralité de nœuds de transfert, qui traitent des paquets entrants au moyen de règles de traitement adaptées aux paquets entrants, et qui comprennent un module de traitement de paquets qui collecte des statistiques relatives aux paquets sur lesquels les règles de traitement ont été appliquées. Le système de communication comprend également un dispositif de contrôle qui, pour un nœud de transfert spécifique, initie une analyse détaillée des paquets qui sont la cible des informations statistiques, sur la base des informations statistiques relatives aux paquets collectés à partir de chaque nœud de transfert ; et qui reçoit et délivre en sortie les résultats de l'analyse du nœud de transfert spécifique (Fig. 1).
PCT/JP2011/056822 2010-03-24 2011-03-22 Système de communication, dispositif de contrôle et procédé de surveillance de trafic Ceased WO2011118575A1 (fr)

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Cited By (14)

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JP2013225856A (ja) * 2012-04-23 2013-10-31 Huawei Technologies Co Ltd フロー統計に用いる方法、装置及びシステム
WO2014141004A1 (fr) * 2013-03-15 2014-09-18 International Business Machines Corporation Équilibrage de charge pour réseaux physiques et virtuels
JP2014171088A (ja) * 2013-03-04 2014-09-18 Ntt Comware Corp ネットワーク監視装置、サービス提供システム、ネットワーク監視方法、及びネットワーク監視プログラム
WO2015029420A1 (fr) * 2013-08-26 2015-03-05 日本電気株式会社 Appareil de communication, procédé de communication, appareil de commande et appareil de gestion dans un système de communication
WO2015029419A1 (fr) * 2013-08-26 2015-03-05 日本電気株式会社 Appareil et procédé de gestion dans un système de communication
US9104643B2 (en) 2013-03-15 2015-08-11 International Business Machines Corporation OpenFlow controller master-slave initialization protocol
US9118984B2 (en) 2013-03-15 2015-08-25 International Business Machines Corporation Control plane for integrated switch wavelength division multiplexing
US9444748B2 (en) 2013-03-15 2016-09-13 International Business Machines Corporation Scalable flow and congestion control with OpenFlow
US9590923B2 (en) 2013-03-15 2017-03-07 International Business Machines Corporation Reliable link layer for control links between network controllers and switches
US9609086B2 (en) 2013-03-15 2017-03-28 International Business Machines Corporation Virtual machine mobility using OpenFlow
JP2017152852A (ja) * 2016-02-23 2017-08-31 株式会社日立製作所 通信システム、通信装置、および通信システムの通信制御方法
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CN112438037A (zh) * 2018-08-03 2021-03-02 日本电信电话株式会社 控制系统以及控制方法

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013225856A (ja) * 2012-04-23 2013-10-31 Huawei Technologies Co Ltd フロー統計に用いる方法、装置及びシステム
US9491068B2 (en) 2012-04-23 2016-11-08 Huawei Technologies Co., Ltd. Method, apparatus, and system for flow measurement
JP2014171088A (ja) * 2013-03-04 2014-09-18 Ntt Comware Corp ネットワーク監視装置、サービス提供システム、ネットワーク監視方法、及びネットワーク監視プログラム
US9104643B2 (en) 2013-03-15 2015-08-11 International Business Machines Corporation OpenFlow controller master-slave initialization protocol
US9609086B2 (en) 2013-03-15 2017-03-28 International Business Machines Corporation Virtual machine mobility using OpenFlow
US9769074B2 (en) 2013-03-15 2017-09-19 International Business Machines Corporation Network per-flow rate limiting
US9110866B2 (en) 2013-03-15 2015-08-18 International Business Machines Corporation OpenFlow controller master-slave initialization protocol
US9118984B2 (en) 2013-03-15 2015-08-25 International Business Machines Corporation Control plane for integrated switch wavelength division multiplexing
US9407560B2 (en) 2013-03-15 2016-08-02 International Business Machines Corporation Software defined network-based load balancing for physical and virtual networks
US9444748B2 (en) 2013-03-15 2016-09-13 International Business Machines Corporation Scalable flow and congestion control with OpenFlow
WO2014141004A1 (fr) * 2013-03-15 2014-09-18 International Business Machines Corporation Équilibrage de charge pour réseaux physiques et virtuels
US9503382B2 (en) 2013-03-15 2016-11-22 International Business Machines Corporation Scalable flow and cogestion control with openflow
US9614930B2 (en) 2013-03-15 2017-04-04 International Business Machines Corporation Virtual machine mobility using OpenFlow
US9596192B2 (en) 2013-03-15 2017-03-14 International Business Machines Corporation Reliable link layer for control links between network controllers and switches
US9590923B2 (en) 2013-03-15 2017-03-07 International Business Machines Corporation Reliable link layer for control links between network controllers and switches
JPWO2015029420A1 (ja) * 2013-08-26 2017-03-02 日本電気株式会社 通信システムにおける通信装置、通信方法、制御装置および管理装置
WO2015029419A1 (fr) * 2013-08-26 2015-03-05 日本電気株式会社 Appareil et procédé de gestion dans un système de communication
JPWO2015029419A1 (ja) * 2013-08-26 2017-03-02 日本電気株式会社 通信システムにおける管理装置および方法
WO2015029420A1 (fr) * 2013-08-26 2015-03-05 日本電気株式会社 Appareil de communication, procédé de communication, appareil de commande et appareil de gestion dans un système de communication
US9819578B2 (en) 2013-08-26 2017-11-14 Nec Corporation Communication device and method in a communication system, and device and method for communication path control
JP2017152852A (ja) * 2016-02-23 2017-08-31 株式会社日立製作所 通信システム、通信装置、および通信システムの通信制御方法
CN112438037A (zh) * 2018-08-03 2021-03-02 日本电信电话株式会社 控制系统以及控制方法

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