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WO2011118586A1 - Système de communication, dispositif de commande, nœud de réacheminement, procédé pour la mise en œuvre de règles de mise à jour, et programme - Google Patents

Système de communication, dispositif de commande, nœud de réacheminement, procédé pour la mise en œuvre de règles de mise à jour, et programme Download PDF

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Publication number
WO2011118586A1
WO2011118586A1 PCT/JP2011/056843 JP2011056843W WO2011118586A1 WO 2011118586 A1 WO2011118586 A1 WO 2011118586A1 JP 2011056843 W JP2011056843 W JP 2011056843W WO 2011118586 A1 WO2011118586 A1 WO 2011118586A1
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WIPO (PCT)
Prior art keywords
processing rule
forwarding
forwarding node
processing
packet
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Ceased
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PCT/JP2011/056843
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English (en)
Japanese (ja)
Inventor
真司 星野
公士 田淵
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NEC Corp
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NEC Corp
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Publication of WO2011118586A1 publication Critical patent/WO2011118586A1/fr
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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
    • 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
    • H04L45/42—Centralised routing
    • 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
    • H04L41/12—Discovery or management of network topologies

Definitions

  • the present invention relates to a communication system, a control device, a transfer node, a processing rule update method, and a program, and more particularly, a communication system, a control device, a transfer node, and a communication system that realizes communication by transferring a packet by a transfer node arranged in a network.
  • the present invention relates to a processing rule update method and program.
  • control plane implemented in network devices such as switches and routers is separated, and the concept of a programmable flow switch that allows the control server to perform integrated control of the network, computer, and storage including the flow control function is drawing attention. I'm bathing.
  • 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, and operates according to a flow table that is appropriately added or rewritten from the OpenFlow controller.
  • FlowKey a set of a rule (FlowKey; matching key) that matches the packet header, an action (Actions) that defines the processing content, and flow statistical information (Stats) is defined (FIG. 14). reference).
  • FIG. 15 illustrates action names and action contents defined in Non-Patent Document 2.
  • OUTPUT is an action for outputting a packet to a designated port (interface).
  • SET_VLAN_VID to SET_TP_DST are actions for modifying the field of the packet header.
  • the OpenFlow switch when it receives the first packet (first packet), it searches the flow table for an entry having a rule (FlowKey) 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 performs the processing content described in the action field of the entry on the received packet. 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. The packet transfer path is requested based on the above, a flow entry for realizing this is received, and the flow table is updated.
  • FlowKey a rule
  • FIG. 16 is an example of a network constructed with the OpenFlow switches of Non-Patent Documents 1 and 2 above.
  • a route is set for transferring packets belonging to flow # 1, flow # 2, and flow # 10000 in the order of forwarding node # 1, forwarding node # 2, and forwarding node # 4.
  • packets belonging to the flow # 1, flow # 2, and flow # 10000 are output from the port 1 to which the forwarding node # 2 (10b in FIG. 16) is connected.
  • a processing rule (flow entry) is set.
  • the transfer path is switched from the port 1 to the transfer node # 3 (shown in FIG. 16) from the packet output destination specified as the action in the processing rule (flow entry) set in the transfer node # 1 (10a in FIG. 16). 16 of 10c) is realized by rewriting to connected port 2.
  • each processing rule (flow entry) set in forwarding node # 1 (10a in FIG. 16) is changed to a flow entry rewrite message (FlowMod). ) Has the problem that it must be rewritten.
  • the present invention has been made in view of the above circumstances, and the object of the present invention is to process rules (flow entry) set in the forwarding node when the forwarding route needs to be changed. It is to provide a communication system, a control device, a transfer node, a processing rule update method, and a program capable of rewriting data at high speed.
  • a packet processing unit that processes a received packet by using a processing rule that matches the received packet, and a specified processing rule among the processing rules is collectively included in a specified content.
  • a transfer node comprising a processing rule replacement unit that replaces the transfer packet, and generates a transfer path for the received packet and a subsequent packet belonging to the same flow in response to a request from the transfer node, and the transfer node on the transfer path And when the transfer route is changed, the transfer node in which the process rule that needs to be rewritten to change the transfer route is specified, and the specified transfer node And a control device that instructs the processing rule replacement unit to replace the content of the processing rule that needs to be rewritten.
  • a packet processing unit that processes a received packet using a processing rule that matches the received packet, and a specified processing rule among the processing rules is collectively included in a specified content.
  • a processing rule replacement unit that replaces the received packet and creates a transfer path for the received packet and a subsequent packet belonging to the same flow in response to a request from the transfer node.
  • the processing rule to be set in the forwarding node is set, and when changing the forwarding route, the forwarding node in which the processing rule that needs to be rewritten to change the forwarding route is specified, and the specified
  • a control device is provided that instructs the processing rule replacement unit of the forwarding node to replace the content of the processing rule that needs to be rewritten.
  • a packet processing unit that processes a received packet using a processing rule that matches the received packet, and a process specified by a replacement instruction in a predetermined format among the processing rules.
  • a forwarding node is provided that includes a processing rule replacement unit that collectively replaces rules with specified contents.
  • a control device connected to a forwarding node including a packet processing unit that processes a received packet using a processing rule that matches the received packet responds to a request from the forwarding node.
  • Creating a transfer route for the received packet and a subsequent packet belonging to the same flow setting a processing rule to be set in a transfer node on the transfer route, and changing the transfer route, Identifying a forwarding node in which a processing rule that needs to be rewritten due to a change is set, and instructing the identified forwarding node to replace the content of the processing rule that needs to be rewritten; and
  • the received forwarding node replaces the specified processing rule among the processing rules with the specified content in a batch based on an instruction from the control device.
  • a program that is executed by a computer that constitutes the above-described control device or transfer 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.
  • the processing rule (flow entry) set in the forwarding node can be rewritten at high speed.
  • the reason is that it is equipped with a processing rule replacement unit that batch replaces the processing rules specified in the forwarding node with the specified contents, and the processing rules are replaced with the specified contents collectively according to instructions from the control device. It is configured so that it can be done.
  • FIG. 7 is a continuation diagram of FIG. 6.
  • FIG. 8 is a continuation diagram of FIG. 7.
  • FIG. 9 is a continuation diagram of FIG. 8.
  • FIG. 11 is a continuation diagram of FIG. 10.
  • FIG. 10 is a continuation diagram of FIG. 9. It is a block diagram showing the structure of the forwarding node of the 2nd Embodiment of this invention. It is a figure showing the structure of the entry set to the flow table of the open flow switch of a nonpatent literature 1,2. It is a figure which shows the action name described in the nonpatent literature 2, and the content of action. It is a figure for demonstrating the rewriting operation
  • the present invention relates to a packet processing unit (13 in FIG. 1) for processing a received packet using a processing rule (see an entry in the processing rule storage unit 12 in FIG. 1) suitable for the received packet,
  • a packet processing unit 13 in FIG. 1 for processing a received packet using a processing rule (see an entry in the processing rule storage unit 12 in FIG. 1) suitable for the received packet
  • This can be realized by a communication system including a forwarding node (10a to 10c in FIG. 1) including a processing rule replacement unit (11 in FIG. 1) that collectively replaces a specified processing rule with a specified content.
  • the processing rule creates a forwarding path for a received packet and a subsequent packet belonging to the same flow according to a predetermined policy, and forwards the forwarding path. It is set by a control device (20 in FIG. 1) that performs a packet transfer operation according to the transfer path by setting a processing rule in the node. Further, when changing the transfer path, the control device (20 in FIG. 1) identifies a transfer node (for example, 10a in FIG. 1) that needs to rewrite a processing rule for the change of the transfer path, and the influence Instructs the replacement of the contents of the processing rule covered by.
  • a transfer node for example, 10a in FIG. 1
  • the control device (20 in FIG. 1) stores the processing rule of the forwarding node (for example, 10a in FIG. 1) for the forwarding node (for example, 10a in FIG. 1) that requires rewriting of the processing rule.
  • the processing rules held in the section (12 in FIG. 1) a processing rule that needs to be rewritten and a replacement instruction including replacement contents are issued, and the processing of the forwarding node (for example, 10a in FIG. 1)
  • the rule replacement unit (11 in FIG. 1) performs a process of collectively replacing the processing rule specified by the replacement instruction with the specified content.
  • a processing rule to be replaced is designated from among processing rules held in a processing rule storage unit (12 in FIG. 1) of a forwarding node (for example, 10a in FIG. 1), and a port
  • a processing rule storage unit (12 in FIG. 1) of a forwarding node for example, 10a in FIG. 1
  • a port By rewriting from 1 to port 2, for example, it becomes possible to quickly switch the transfer path even in the situation where a failure occurs as shown in FIG.
  • the transfer path change can be determined based on a network maintenance schedule, a failure occurrence report from the transfer node (10a to 10c in FIG. 1), a load occurrence state, and the like.
  • the control device (20 in FIG. 1) transmits an inquiry message (Features Request) to the forwarding node specified in Non-Patent Document 2, and a response is sent from the forwarding node (10a to 10c in FIG. 1).
  • Features Reply By receiving the message (Features Reply), it is possible to grasp the failure occurrence status in the forwarding nodes (10a to 10c in FIG. 1) (“5.3 Controller-to-Switch Messages” in Non-Patent Document 2). See below.)
  • FIG. 2 is a diagram illustrating the overall configuration of the communication system according to the first embodiment of this invention.
  • an OpenFlow network configured by a plurality of transfer nodes 10a to 10d and a control device (OpenFlow controller) that transmits flow entries and packets to these transfer nodes 10a to 10d via dedicated channels. 20 are shown.
  • OpenFlow controller OpenFlow controller
  • FIG. 3 is a block diagram showing the configuration of the forwarding nodes 10a to 10d.
  • the processing rule replacement unit 11, the processing rule storage unit 12 corresponding to the flow table of Non-Patent Documents 1 and 2, and the processing rule storage unit 12 are received via the user interface unit 14.
  • a forwarding node 10 including a packet processing unit 13 that processes a packet and an OpenFlow protocol processing unit 16 that communicates with a control device 20 via an OpenFlow interface unit 15 is illustrated.
  • the forwarding node 10 searches the processing rule storage unit 12 for a processing rule that matches the received packet, and implements the processing content described in the action field of the processing rule (see Actions in FIG. 14). On the other hand, if the processing rule matching the received packet is not found as a result of the search, the OpenFlow protocol processing unit 16 of the forwarding node 10 forwards the received packet to the control device (OpenFlow controller) 20 (Packet- In), a function for requesting determination of a transfer path of a flow to which the packet belongs based on the transmission source / destination of the received packet, receiving a processing rule for realizing this, and registering / updating in the processing rule storage unit 12 is provided. ing.
  • OpenFlow controller 20 Packet- In
  • FIG. 4 is a diagram for explaining a detailed configuration of the processing rule replacement unit 11 of the forwarding node 10.
  • the processing rule replacement unit 11 is based on a matching key (see FlowKey in FIG. 14) for specifying a processing rule to be rewritten similar to the processing rule held in the processing rule storage unit 12. Then, the processing rule storage unit 12 is searched, and processing for rewriting the output port of the action field of the processing rule that matches the matching key with the designated replacement content is performed.
  • the forwarding node 10 as described above can also be realized by a configuration in which the processing rule replacement unit 11 is added to the OpenFlow switch of Non-Patent Documents 1 and 2.
  • processing rule replacement unit 11 of the forwarding node 10 shown in FIG. 3 is realized by a computer program that causes the computer constituting the forwarding node 10 to execute the processing rule replacement processing described above using its hardware. You can also.
  • FIG. 5 is a block diagram showing a detailed configuration of the control device (OpenFlow controller) 20. Referring to FIG. 5, a configuration including an information collection unit 21, a flow entry creation unit 22, a route calculation unit 23, a topology management unit 24, a control message generation unit 25, and an OpenFlow interface unit 26 is shown. Has been.
  • the information collection unit 21 collects and manages the identification information and physical port information of the forwarding node 10 using the inquiry message (Features Request) described above, and provides the flow entry creation unit 22 with the collected information.
  • the flow entry creating unit 22 refers to the information of the forwarding node 10 provided from the information collecting unit 21 and creates a processing rule that realizes the forwarding route calculated by the route computing unit 23.
  • the route calculation unit 23 refers to the network topology information of the topology management unit 24 and calculates a packet transfer route.
  • the route calculation method an algorithm such as a Dijkstra method for creating a route connecting the shortest hops can be used.
  • the topology management unit 24 manages network topology information representing the connection relationship between the forwarding nodes 10.
  • each unit (processing means) of the control device (OpenFlow controller) 20 illustrated in FIG. 5 executes the above-described processes using the hardware of the computer that configures the control device (OpenFlow controller) 20. It can also be realized by a computer program.
  • the control device (OpenFlow controller) 20 that has received failure information indicating that a failure has occurred in the link with the forwarding node 10d from the forwarding node 10b as shown in FIG.
  • the update node 10a, the transfer node 10c, and the transfer node 10d (node # 1, node # 3, node # 4) are replaced with the previous transfer path based on the information and the transfer node status information. ) In order of transfer.
  • the control device (OpenFlow controller) 20 that created the transfer path transmits a replacement instruction necessary for switching to the created transfer path to the transfer node 10a that is the transfer path switching point.
  • This replacement instruction includes a matching key for identifying the processing rules of the flow # 1, flow # 2, and flow # 10000 that need to be rewritten among the processing rules set in the forwarding node 10a, and the replacement contents. New output port information is included.
  • the processing rule replacement unit 11 of the forwarding node 10a searches the processing rule storage unit 12 for a processing rule that matches the matching key (see FlowKey in FIG. 14) (see FIG. 11), and its action. A process of rewriting the output port of the field with the designated replacement content is performed (see FIG. 12). As a result of the above, as shown in FIGS. 11 and 12, the output port information in the action field of the processing rule of flow # 1, flow # 2, and flow # 10000 is rewritten from port 1 to port 2 at once.
  • a transfer node that is a change point of the transfer path is specified, and a number of processing rules held in the transfer node are determined. It becomes possible to rewrite promptly.
  • the communication volume and communication time associated with the rule update are also reduced.
  • FIG. 13 is a block diagram showing the configuration of the forwarding node 10A according to the second exemplary embodiment of the present invention.
  • the difference from the forwarding node 10 of the first embodiment of the present invention is that a failure processing unit 17 that outputs a replacement instruction to the processing rule replacement unit 11 is added, and the control device (open) described in the first embodiment is opened. This is the point that the route can be changed even if there is no replacement instruction from the flow controller 20.
  • description will be added focusing on differences from the first embodiment.
  • the failure processing unit 17 in the present embodiment has a function of outputting a replacement instruction associated with the content of the failure based on the failure information acquired by itself or through the packet processing unit. For example, when a failure is detected in the port 1 of the forwarding node 10A, the failure processing unit 17 outputs a processing rule output destination that matches a predetermined matching key among the processing rules held in the processing rule storage unit 12. A replacement instruction for switching the port from port 1 to port 2 is output. Similarly, for example, when a failure is detected in the port 2 of the forwarding node 10A, the failure processing unit 17 selects a processing rule that matches a predetermined matching key from among the processing rules held in the processing rule storage unit 12. A replacement instruction for switching the output destination port from port 2 to port 1 is output.
  • the correspondence relationship between the content of the failure held in the failure processing unit 17 and the replacement instruction may be appropriately rewritten from the input device or the control device (open flow controller) 20 omitted in the drawing.
  • the control device includes an extraction condition for extracting a processing rule to be replaced among processing rules held by the forwarding node, and a packet output destination after replacement.
  • a replacement instruction is transmitted to the identified forwarding node, and the processing rule replacement unit of the forwarding node extracts the processing rule to be replaced using the extraction condition, and collectively outputs the packet output destination of the extracted processing rule Replacement communication system.
  • the control device sets processing rules that need to be rewritten to change the forwarding path, based on a network topology that represents a connection relationship between the forwarding nodes.
  • a communication system that identifies a forwarding node.
  • the forwarding node further outputs a replacement instruction associated with the content of the failure based on the failure information obtained by itself or through the packet processing unit.
  • the processing rule replacement unit replaces the processing rule with the designated content collectively based on a replacement instruction from the failure processing unit.
  • a replacement instruction including an extraction condition for extracting a processing rule to be replaced among processing rules held by the forwarding node, and a packet output destination after replacement
  • a control device that transmits to a specified forwarding node causes the forwarding node to extract a processing rule to be replaced using the extraction condition, and collectively replaces packet output destinations of the extracted processing rule.
  • a forwarding node in which a processing rule that needs to be rewritten for changing the forwarding path is set based on a network topology that represents a connection relationship between the forwarding nodes.
  • the control unit to identify.
  • the processing rule replacement unit extracts a processing rule to be replaced using an extraction condition included in the replacement instruction, and replaces packet output destinations included in the replacement instruction collectively. Forwarding node.

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

La présente invention concerne une configuration pouvant rapidement effectuer la réécriture de règles de traitement (entrée de flux) qui sont établies dans un noeud de réacheminement lors de la modification de chemin de réacheminement de paquets. Le système de communication selon l'invention contient un noeud de réacheminement équipé: d'une unité de traitement de paquets qui traite des paquets reçus au moyen de règles de traitement appliquées aux paquets reçus ; et d'une unité de remplacement de règles de traitement qui remplace lesdites règles de traitement avec un contenu désigné en bloc. Le système de communication comporte également un dispositif de commande qui, en réponse à une demande provenant dudit noeud de réacheminement, crée un chemin de réacheminement pour lesdits paquets reçus et les paquets ultérieurs appartenant au même flux ; établit des règles de traitement à être établies dans le noeud de réacheminement sur ledit chemin de réacheminement ; et lors de la modification dudit chemin de réacheminement, identifie un noeud de réacheminement dont les règles de traitement sont établies qui nécessitent d'être réécrites pour la modification dudit chemin de réacheminement, et commande à l'unité de remplacement de règles de traitement dudit noeud de réacheminement identifié de remplacer le contenu desdites règles de traitement qui nécessitent une réécriture.
PCT/JP2011/056843 2010-03-24 2011-03-22 Système de communication, dispositif de commande, nœud de réacheminement, procédé pour la mise en œuvre de règles de mise à jour, et programme Ceased WO2011118586A1 (fr)

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WO2013114489A1 (fr) * 2012-01-30 2013-08-08 Nec Corporation Procédé de contrôle, appareil de contrôle, système de communication et programme associé
WO2013128332A1 (fr) * 2012-02-28 2013-09-06 International Business Machines Corporation Chemins multiples disjoints pour un réseau de centre de données
WO2013180207A1 (fr) * 2012-05-31 2013-12-05 日本電気株式会社 Dispositif de commande, système de communication, procédé de commande de commutateur et programme
WO2014032624A1 (fr) * 2012-08-31 2014-03-06 Hangzhou H3C Technologies Co., Ltd. Retransmission de paquet
WO2014061587A1 (fr) * 2012-10-15 2014-04-24 日本電気株式会社 Dispositif de commande, nœud, système de communication, procédé de communication, et programme
JP2014535197A (ja) * 2011-10-14 2014-12-25 グリマーグラス・ネットワークス・インコーポレーテッド 光配信ネットワーク管理方法及びシステム

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Cited By (15)

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JP2014535197A (ja) * 2011-10-14 2014-12-25 グリマーグラス・ネットワークス・インコーポレーテッド 光配信ネットワーク管理方法及びシステム
WO2013114489A1 (fr) * 2012-01-30 2013-08-08 Nec Corporation Procédé de contrôle, appareil de contrôle, système de communication et programme associé
JP2015508950A (ja) * 2012-01-30 2015-03-23 日本電気株式会社 コントロール方法、コントロール装置、通信システムおよびプログラム
US9178943B2 (en) 2012-02-28 2015-11-03 International Business Machines Corporation Disjoint multi-pathing for a data center network
WO2013128332A1 (fr) * 2012-02-28 2013-09-06 International Business Machines Corporation Chemins multiples disjoints pour un réseau de centre de données
US9455899B2 (en) 2012-02-28 2016-09-27 International Business Machines Corporation Disjoint multi-pathing for a data center network
US9185166B2 (en) 2012-02-28 2015-11-10 International Business Machines Corporation Disjoint multi-pathing for a data center network
JPWO2013180207A1 (ja) * 2012-05-31 2016-01-21 日本電気株式会社 制御装置、通信システム、スイッチ制御方法及びプログラム
WO2013180207A1 (fr) * 2012-05-31 2013-12-05 日本電気株式会社 Dispositif de commande, système de communication, procédé de commande de commutateur et programme
US9967177B2 (en) 2012-05-31 2018-05-08 Nec Corporation Control apparatus, communication system, switch control method and program
WO2014032624A1 (fr) * 2012-08-31 2014-03-06 Hangzhou H3C Technologies Co., Ltd. Retransmission de paquet
US9397942B2 (en) 2012-08-31 2016-07-19 Hangzhou H3C Technologies Co., Ltd. Packet forwarding
US9397943B2 (en) 2012-08-31 2016-07-19 Hangzhou H3C Technologies Co., Ltd. Configuring virtual media access control addresses for virtual machines
US9667541B2 (en) 2012-08-31 2017-05-30 Hewlett Packard Enterprise Development Lp Virtual MAC address, mask-based, packet forwarding
WO2014061587A1 (fr) * 2012-10-15 2014-04-24 日本電気株式会社 Dispositif de commande, nœud, système de communication, procédé de communication, et programme

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