WO2014132967A1 - 通信システム、スイッチ、制御装置、制御用チャネルの構築方法及びプログラム - Google Patents
通信システム、スイッチ、制御装置、制御用チャネルの構築方法及びプログラム Download PDFInfo
- Publication number
- WO2014132967A1 WO2014132967A1 PCT/JP2014/054568 JP2014054568W WO2014132967A1 WO 2014132967 A1 WO2014132967 A1 WO 2014132967A1 JP 2014054568 W JP2014054568 W JP 2014054568W WO 2014132967 A1 WO2014132967 A1 WO 2014132967A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- switch
- control
- packet
- control device
- layer
- Prior art date
Links
Images
Classifications
-
- 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
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
- H04L12/462—LAN interconnection over a bridge based backbone
- H04L12/4625—Single bridge functionality, e.g. connection of two networks over a single bridge
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/64—Hybrid switching systems
- H04L12/6418—Hybrid transport
-
- 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
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
-
- 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
- H04L41/40—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks using virtualisation of network functions or resources, e.g. SDN or NFV entities
-
- 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
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
-
- 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
- H04L45/38—Flow based routing
-
- 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
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
Definitions
- the present invention is based on the priority claim of Japanese Patent Application No. 2013-036091 (filed on Feb. 26, 2013), the entire contents of which are incorporated herein by reference. Shall.
- the present invention relates to a communication system, a switch, a control device, and a control channel construction method and program, and more particularly, to a centralized control communication system, switch, control device, control channel construction method and program having a control device.
- a network in which a packet transfer function of a network device and a control function such as route control are separated has attracted attention.
- the network device is responsible for the packet transfer function, and the controller separated outside the network device is responsible for the control function. In this way, it becomes possible to construct a network that is easy to control and rich in flexibility.
- Non-Patent Documents 1 and 2 propose a technique called OpenFlow that realizes the centralized control network.
- 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. For each flow, a set of match conditions (Match Fields), flow statistical information (Counters), and instructions (Instructions) that define processing contents are defined for each flow (non-patented). (Refer to “5.2 Flow Table” in Document 2).
- the OpenFlow switch searches the flow table for an entry having a matching condition (see “5.3 Matching” 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 “5.3 Matching” in Non-Patent Document 2
- the OpenFlow switch updates the flow statistical information (counter
- Non-Patent Document 3 a control channel is accommodated in a data network between switches without providing a control network (hereinafter referred to as “In-band control method”.
- In-band control method For example, Non-Patent Document 3 Reference.
- Non-Patent Documents 1 and 2 high reliability is required for a control channel between a control device and a switch.
- the switch that has been controlled via the control channel is removed from the control target of the control device and becomes uncontrollable.
- a communication failure is caused even in a state where it is connected to the data channel link.
- LAG Link Aggregation
- Non-Patent Document 3 it is necessary to add a function that causes each switch to interpret a special frame. Further, Non-Patent Document 3 only states that the fault tolerance can be improved by periodically repeating the topology search.
- the present invention provides a communication system, a switch, a control device, a control channel construction method, and a program that provide automatic recovery means when disconnecting the control channel of the centralized control network and can contribute to improvement of fault tolerance.
- the purpose is to provide.
- a control device that controls the switch by setting control information in the switch via a control channel, and a packet that processes a received packet based on the control information set from the control device
- a control unit learns a control packet input port between the control device and another switch, and based on the learning result, detects a disconnection of the control channel and a layer 2 transfer unit that transfers the control packet
- a packet requesting resolution of the layer 2 address of the control device is transmitted to the adjacent switch, the layer 2 address is acquired from the control device via the adjacent switch, and the acquired layer 2 address is acquired.
- an alternative control channel configuration unit that configures a second control channel with the control device using a switch. Communication system is provided.
- a packet processing unit that processes a received packet based on control information set from a control device that controls the switch by setting control information in the switch via a control channel; Learning the input port of the control packet between the control device and the other switch, based on the learning result, adjacent to the layer 2 forwarding unit that forwards the control packet and detecting the disconnection of the control channel A packet requesting resolution of the layer 2 address of the control device is transmitted to the switch, a layer 2 address is acquired from the control device via the adjacent switch, and the control is performed using the acquired layer 2 address.
- a switch comprising an alternative control channel configuration unit that configures a second control channel with the device.
- a control device that configures the second control channel in response to a request from the switch that detects the disconnection of the control channel.
- a packet processing unit that processes a received packet based on control information set from a control device that controls the switch by setting control information in the switch via a control channel;
- a switch that learns an input port of a control packet between the control device and another switch, and that has a layer 2 forwarding unit that forwards the control packet based on the learning result, detects the disconnection of the control channel
- a step of transmitting a packet requesting resolution of a layer 2 address of the control device to an adjacent switch, a step of acquiring a layer 2 address from the control device via the adjacent switch, and the acquired Configuring a second control channel with the control device using a layer 2 address, for control How to build a Yaneru is provided.
- the method is associated with a specific machine, a switch that processes received packets based on control information set via a control channel.
- a packet processing unit that processes a received packet based on control information set from a control device that controls the switch by setting control information in the switch via a control channel;
- the control channel is connected to a computer mounted on a switch comprising a layer 2 forwarding unit that learns an input port of a control packet between the control device and another switch and forwards the control packet based on the learning result.
- processing for transmitting a packet requesting resolution of the layer 2 address of the control device to an adjacent switch and processing for acquiring a layer 2 address from the control device via the adjacent switch And a process of configuring a second control channel with the control device using the acquired layer 2 address;
- Program to be executed is provided.
- This program 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 switches 10A and 10B are set. It can be realized by a communication system including a control device 20A for controlling the control.
- the switch 10A (10B) includes a packet processing unit 12 that processes a received packet based on control information set by the control device 20A, and an input of a control packet between the control device and another switch.
- a layer 2 transfer unit 13 that learns a port and transfers the control packet based on the learning result, and an alternative control channel configuration unit 14 are provided.
- the alternative control channel configuration unit 14 transmits a packet requesting resolution of the layer 2 address of the control device to an adjacent switch (see FIG. 2).
- the alternative control channel configuration unit 14 uses the acquired layer 2 address to communicate with the control device.
- a second control channel is formed between them (see FIG. 5). Note that the control packet between the switch that has detected the disconnection of the control channel and the control device 20A is relayed by the layer 2 transfer unit 13 of the switch on the second control channel.
- FIG. 6 is a diagram illustrating a configuration of the communication system according to the first embodiment.
- a plurality of switches 10-1 to 10-4 and a control device 20 that controls these switches 10-1 to 10-4 are shown.
- the switches 10-1 to 10-4 are connected by a link indicated by a solid line in FIG.
- the switches 10-1 to 10-4 and the control device 20 are connected by a control channel indicated by a broken line in FIG.
- the reference numeral # 1-1 in FIG. 6 represents the port numbers of the switches 10-1 to 10-4.
- FIG. 7 is a diagram showing a configuration of the switch according to the first embodiment (hereinafter referred to as “switch 10” when the switches 10-1 to 10-4 are not particularly distinguished).
- switch 10 a configuration including a control information storage unit 11, a packet processing unit 12, a layer 2 transfer unit 13, an alternative control channel configuration unit 14, and a protocol processing unit 15 is shown.
- 7 is a port number corresponding to FIG. 6,
- LOCAL is a local port inside the switch connected to the alternative control channel configuration unit 14, and NORMAL is a layer 2 transfer unit 13 The normal port inside the switch connected to is shown.
- the control information storage unit 11 stores control information (flow entry) transmitted from the control device 20.
- FIG. 8 is an example of a table that stores control information (flow entry).
- the control information (flow entry) is a process that is applied to a matching condition that is matched with the header of the received packet, and a packet that matches the matching condition.
- the instruction that defines the contents and the priority indicating the priority order of each control information are associated with each other.
- the packet processing unit 12 searches the control information storage unit 11 for control information (flow entry) having a matching condition that matches the received packet, and the processing contents (designation specified in the instruction field) (Transfer from port, rewrite header, discard, etc.)
- control information flow entry
- the source MAC address SMAC
- DMAC destination MAC address
- control information (flow entry) having matching conditions that match the received packet does not exist in the control information storage unit 11
- the packet processing unit 12 sends the received packet to the control device 20 via the protocol processing unit 15. Is transmitted to request generation / transmission of control information (flow entry) (corresponding to the Packet-In message of Non-Patent Document 2). Note that the operation for requesting transmission of control information (flow entry) is also executed when it is set as an instruction of control information (flow entry).
- the layer 2 transfer unit 13 holds the MAC address table and performs the following operations. First, when receiving a packet, the layer 2 forwarding unit 13 refers to the source MAC address of the ether frame header of the packet, and if there is no corresponding entry in the MAC address table, it corresponds to the MAC address and the receiving port. And register it in the MAC address table. When there is an entry corresponding to the MAC address table, the layer 2 transfer unit 13 outputs a received packet from the port associated with the MAC address. If there is no corresponding entry in the MAC address table, the layer 2 forwarding unit 13 outputs the packet from all ports except the input port (flooding).
- the alternative control channel configuration unit 14 performs control from all ports connected to other switches.
- An ARP (Address Resolution Protocol) packet for requesting resolution of the MAC address of the device 20 is output. This packet is transferred to the control device 20 by the operation in the adjacent switch, for example, when there is no control information (flow entry) having matching conditions matching the received packet described above in the control information storage unit 11.
- the alternative control channel configuration unit 14 transmits a control packet to the control device 20 with the MAC address as a destination.
- the control packet is delivered to the control device 20 via the layer 2 transfer unit 13 of the adjacent switch 10.
- an alternative control channel is established.
- the protocol processing unit 15 communicates with the control device 20 according to a predetermined protocol such as the open flow protocol of Non-Patent Document 2 and stores control information (flow entry) received from the control device 20 in the control information storage unit 11 In addition, an operation for deleting the control information (flow entry) instructed from the control device 20 from the control information storage unit 11 is executed.
- the switch 10 including the layer 2 transfer unit 13 as described above may be configured by adding an alternative control channel configuration unit 14 to the switch specified as “Hybrid Switch” in Non-Patent Document 2. Yes (see “5.1 Pipeline Processing” in Non-Patent Document 2).
- FIG. 9 is a diagram illustrating a configuration of the control device 20 according to the first embodiment. Referring to FIG. 9, a configuration including an alternative control channel management unit 21, a switch management unit 22, a packet packing / distribution unit 23, and a packet transmission / reception unit 24 is shown.
- the alternative control channel management unit 21 is a module that manages information on a switch (relay switch) serving as an alternative route when the control channel is disconnected.
- the alternative control channel management unit 21 includes a relay switch selection unit 211 and a relay switch management unit 212.
- the relay switch selection unit 211 receives the ARP request packet from the switch 10 that has detected the disconnection of the control channel, the relay switch selection unit 211 refers to the relay switch management unit 212 and the ARP request packet has already established an alternative control channel (other switches First, the ARP request packet is received first, and the ARP response has been transmitted), and then the ARP response packet is transmitted.
- FIG. 10 is an example of relay switch information held by the relay switch management unit 212.
- the IP address of the switch that detected the disconnection of the control channel is stored in the control channel connection destination switch field, and the switch and its port information on the alternate control channel of the switch are stored in the relay switch field. ing.
- the relay switch selection unit 211 When receiving the ARP request packet, the relay switch selection unit 211 checks whether an entry corresponding to the transmission source switch already exists. As a result of the confirmation, if there is no entry corresponding to the transmission source switch, the relay switch selection unit 211 relays the ARP request packet transmission source switch information and the ARP to the relay switch management unit 212. The switch information is stored, and a response to the transmission source of the ARP request packet is transmitted. On the other hand, as a result of the confirmation, if an entry corresponding to the transmission source switch already exists, information necessary for constructing the alternative control channel (the MAC address of the control device 20) has already reached the transmission source switch 10. The relay switch selection unit 211 discards the ARP request packet.
- the switch management unit 22 is a module that manages a switch connected to the control device 20. For example, in response to a control information (flow entry) transmission request (Packet-In message) from each switch 10, an operation of generating and transmitting control information (flow entry) is performed.
- the switch management unit 22 holds a network topology constituted by the switch 10 and port information held by each switch in order to generate the control information (flow entry).
- the packet packing / distributing unit 23 performs an operation of encapsulating a packet to be transmitted to the switch 10 or assembling a packet received from the switch 10 and distributing the packet to the alternative control channel management unit 21 or the switch management unit 22. Specifically, the packet packing / sorting unit 23 transfers the ARP request packet transferred from the switch 10 to the alternative control channel management unit 21, and receives the ARP response packet output from the alternative control channel management unit 21 as a packet. The operation to output to the transmission module is performed.
- the packet transmission / reception unit 24 is a module that transmits and receives packets to and from the switch 10 via the control channel or the alternative control channel.
- the control device 20 as described above can be configured by adding an alternative control channel management unit 21 and a packet distribution function to the alternative control channel management unit 21 based on the OpenFlow controller of Non-Patent Document 2. it can.
- the units (processing means) of the switch 10 and the control device 20 shown in FIG. 1 are realized by a computer program that causes a computer constituting these devices to execute the above-described processes using the hardware. You can also.
- FIG. 11 is a diagram illustrating an initial setting operation performed by the control device 20 according to the present embodiment.
- the control device 20 sets control information (flow entry) that causes each switch 10 to execute the following processes (1) to (3) as an initial setting.
- (1) The packet addressed to the control device 20 is transferred by the layer 2 transfer unit 13.
- the second control information (flow entry) from the bottom in FIG. 8 is set in each switch.
- DMAC destination MAC address of the control device from the normal port (layer 2 reserved port)
- the normal port (layer 2 reserved port) is equivalent to the “Normal” port defined as a reserved port of “Hybrid Switch” having a layer 2 transfer function in Non-Patent Document 2.
- the packet from the control device 20 is transferred by the layer 2 transfer unit 13.
- the first control information (flow entry) from the bottom in FIG. 8 is set in each switch.
- SMAC source MAC address of the control device from the normal port (layer 2 reserved port)
- a packet that is a packet from the control device 20 and whose destination MAC address is the MAC address assigned to the port of the own device is determined to be a control packet addressed to the own device, and the alternative control channel configuration unit 14
- the first and second control information (flow entry) from the top in FIG. 8 is set in each switch.
- an instruction for outputting the packet from the local port is defined.
- the local port is a port connected to the alternative control channel configuration unit 14 inside the switch, and is equivalent to a “Local” port defined as a reserved port in Non-Patent Document 2.
- control information (flow entry) shown in FIG. 8 As described above, by setting the control information (flow entry) shown in FIG. 8 in each switch, the initial setting is completed, and an alternative control channel can be configured. Note that part of the matching conditions of the control information (flow entry) that realizes the above processing is matched. For this reason, in the example of FIG. 8, a high priority is given so that control information (flow entry) in which a finer match condition is set is preferentially applied.
- FIG. 12 is a diagram illustrating an operation when the control channel disconnection is detected in the switch 10-1 of the present embodiment. As shown in FIG. 12, when the switch 10-1 detects disconnection of the control channel, the switch 10-1 transmits the ARP request packet of the control device from the ports connected to the other switches 10-2 and 10-3.
- Transfer of the ARP request packet to the control device 20 in FIG. 13 can also be realized by setting control information (flow entry) for transferring the ARP request packet to the control device 20 in each switch at the time of initial setting.
- the control device 20 that has received the ARP request packet selects one of the switches 10-2 and 10-3 as a relay switch, specifies a connection port with the switch 10-1, and instructs the output of the ARP response packet. .
- the control device 20 since the ARP request packet from the switch 10-2 has arrived at the control device 20 first, the control device 20 selects the switch 10-2 as a relay switch, and from its port # 2-1 An instruction to transmit an ARP response packet is given.
- the output of the ARP response packet is instructed using the Packet-Out message of Non-Patent Document 2.
- the switch with the earlier arrival of the ARP request packet (that is, the shorter channel length) is selected as the relay switch.
- the control device 20 performs the performance and position of each switch (actual Or the like on the shortest route).
- the switch 10-2 Upon receiving the Packet-Out message instructing the output of the ARP response packet, the switch 10-2 outputs the ARP response packet from the port designated by the Packet-Out message, as shown in FIG. As a result, the ARP response packet from the control device 20 reaches the switch 10-1.
- the alternative control channel configuration unit 14 that has received the ARP response packet transmits a session connection request packet to the control device 20 from the port that has received the ARP response packet.
- the switch 10-2 receives the session connection request packet, the switch 10-2 passes through the layer 2 transfer unit 13 according to control information (flow entry) that is set in the initial setting and transfers the packet addressed to the control device in layer 2.
- control information flow entry
- the control device 20 may suppress flooding by transmitting a packet that causes the layer 2 transfer unit 13 of the switch 10-2 to learn its own MAC address.
- the control device 20 that has received the session connection request packet transmits a session connection response packet to the switch 10-1 via the switch 10-2.
- the switch 10-2 receives the session connection response packet, the switch 10-2 follows the control information (flow entry) that is set in the initial setting and transfers the packet originating from the control device 20 in layer 2, and the layer 2 transfer unit 13 to the switch 10-1.
- the layer 2 transfer unit 13 of the switch 10-2 learns the MAC address of the switch 10-1 and its port when transferring the session connection request packet, no flooding is performed.
- an alternative control channel is established as shown in FIG. Thereafter, the control device 20 resumes the control of the switch 10-1. If this alternative control channel is also disconnected, the above-mentioned [ARP request transfer after disconnecting control channel] process is executed again, so that the alternative control with the switch 10-3 as a relay switch is performed.
- a channel can be built.
- control channel it is possible to realize redundancy of the control channel without adding a physical link between the control device 20 and the switch 10.
- the reason is that an alternative control channel can be configured as long as there is a physical path that can reach the control device 20 via another switch.
- the present invention can also be applied to a network in which layer 2 switches that are not controlled by the control device 20 are mixed (second embodiment).
- a layer 2 switch (hereinafter referred to as “L2 switch”) 30-1 is disposed between the control device 20 and the switches 10-1 to 10-4. Even in this case, when the link connecting the switch 10 and the L2 switch is disconnected, transmission of the ARP request packet is started as in the first embodiment, and an alternative control channel can be established by the same procedure. .
- the L2 switch 30- is sent at the timing when the session connection request packet is transmitted from the control channel disconnection detection switch (for example, the switch 10-1). 1 will learn the MAC table.
- the control device 20 may suppress flooding by transmitting a packet that causes the L2 switch 30-1 to learn its own MAC address.
- the L2 switch 30-2 is also arranged between the switch 10-2 and the switch 10-3. Even in this case, the ARP request packet and the ARP response packet can be transferred without any problem. For example, if the control channel of the switch 10-2 in FIG. 17 is disconnected, the switch 10-2 also transmits an ARP request packet to the L2 switch 30-2. At this stage, the L2 switch 30-2 learns the MAC address of the switch 10-2. Then, the L2 switch 30-2 floods the ARP request packet, so that the ARP request packet reaches the switch 10-4. After that, as in the first embodiment, the switch 10-4 requests the control device 20 to generate and transmit control information (flow entry), so that the ARP request packet is transmitted to the control device 20. To reach.
- the control device 20 selects the switch 10-4 as a relay switch, the control device 20 instructs the switch 10-4 to output an ARP response packet toward the L2 switch 30-2.
- the L2 switch 30-2 since the L2 switch 30-2 has learned the MAC address of the switch 10-2, the ARP response packet reaches the switch 10-2. Further, the L2 switch 30-2 learns the MAC address of the control device 20 when receiving the ARP response packet. Therefore, the session connection request packet received from the switch 10-2 is also transferred to the control device 20 via the switch 10-4. Is done.
- the present invention can also be applied to the In-band control method described in Non-Patent Document 3.
- control information storage unit 10A, 10B, 10-1 to 10-4 switch 11 control information storage unit 12 packet processing unit 13 Layer 2 Transfer Unit 14 Alternative Control Channel Configuration Unit 15 Protocol Processing Unit 20, 20A Control Device 21 Alternative Control Channel Management Unit 22 Switch Management Unit 23 Packet Packing / Distribution Unit 24 Packet Transmission / Reception Units 30-1, 30-2 Layer 2 Switch (L2 switch) 211 Relay switch selection unit 212 Relay switch management unit # 1-1, # 1-2, # 1-3, # 2-1 port
Abstract
Description
本発明は、日本国特許出願:特願2013-036091号(2013年2月26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、通信システム、スイッチ、制御装置、制御用チャネルの構築方法及びプログラムに関し、特に、制御装置を有する集中制御型の通信システム、スイッチ、制御装置、制御用チャネルの構築方法及びプログラムに関する。
続いて、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6は、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6を参照すると、複数のスイッチ10-1~10-4と、これらスイッチ10-1~10-4を制御する制御装置20とが、示されている。スイッチ10-1~10-4は、図6の実線で示されたリンクによって接続されている。また、スイッチ10-1~10-4と制御装置20は、図6の破線で示された制御用チャネルで接続されている。なお、図6の#1-1といった符号は、スイッチ10-1~10-4のポート番号を表している。
図11は、本実施形態の制御装置20による初期設定の動作を表した図である。制御装置20は、スイッチ10と制御チャネルが確立されると、初期設定として、各スイッチ10に、以下の処理(1)~(3)を実行させる制御情報(フローエントリ)を設定する。(1)制御装置20宛てのパケットは、レイヤ2転送部13で転送する。例えば、図8の下から2番目の制御情報(フローエントリ)が各スイッチに設定される。なお、図8の例では、マッチ条件がDMAC(宛先MACアドレス)=制御装置のMACアドレスであるパケットをノーマルポート(レイヤ2予約ポート)から出力するインストラクションが定められている。これにより、該当するパケットを受信すると、ノーマルポート経由でレイヤ2転送部13による転送が行われる。ここで、ノーマルポート(レイヤ2予約ポート)とは、非特許文献2において、レイヤ2転送機能を備えた「Hybrid Switch」の予約ポートとして規定されている「Normal」ポートと同等のものである。
(2)制御装置20からのパケットは、レイヤ2転送部13により転送する。例えば、図8の下から1番目の制御情報(フローエントリ)が各スイッチに設定される。なお、図8の例では、マッチ条件がSMAC(送信元MACアドレス)=制御装置のMACアドレスであるパケットをノーマルポート(レイヤ2予約ポート)から出力するインストラクションが定められている。これにより、先の(1)の制御情報(フローエントリ)と同様に、該当するパケットを受信すると、レイヤ2転送部13による転送が行われる。
(3)制御装置20からのパケットであり、かつ、宛先MACアドレスが自装置のポートに付与されたMACアドレスであるパケットは、自装置宛ての制御パケットであると判断し、代替制御チャネル構成部14に送る。例えば、図8の上から1、2番目の制御情報(フローエントリ)が各スイッチに設定される。なお、図8の例では、該当パケットをローカルポートから出力するインストラクションが定められている。ここで、ローカルポートとは、スイッチ内部の代替制御チャネル構成部14に接続されているポートであり、非特許文献2において予約ポートとして規定されている「Local」ポートと同等のものである。
図12は、本実施形態のスイッチ10-1において制御チャネル切断を検出した場合の動作を表した図である。図12に示したとおり、スイッチ10-1は、制御チャネル切断を検出すると、他のスイッチ10-2、10-3と接続されているポートから、制御装置のARP要求パケットを送信する。
前記ARP要求パケットを受信した制御装置20は、スイッチ10-2、10-3のいずれかを中継スイッチとして選択し、スイッチ10-1との接続ポートを指定してARP応答パケットの出力を指示する。図14の例では、スイッチ10-2からのARP要求パケットの方が先に制御装置20に到達したため、制御装置20は、中継スイッチとしてスイッチ10-2を選択し、そのポート#2-1からARP応答パケットを送信するよう指示している。なお、本実施形態では、非特許文献2のPacket-Outメッセージを用いてARP応答パケットの出力を指示している。また、本実施形態では、ARP要求パケットの到達が早かった(つまりチャネル長が短い)方のスイッチを中継スイッチとして選択しているが、例えば、制御装置20が、各スイッチの性能や位置(実際に最短経路上にあるかどうか)等を考慮するものとしてもよい。
前記ARP応答パケットを受信したスイッチ10-1は、スイッチ10-2からARP応答パケットを受信したので、図8の上から1番目の制御情報(フローエントリ)に従い、内部のローカルポートを介して、代替制御チャネル構成部14にARP応答パケットを転送する。
[第1の形態]
(上記第1の視点による通信システム参照)
[第2の形態]
第1の形態の通信システムにおいて、
前記スイッチは、前記制御チャネルの切断を検出した場合、隣接するすべてのスイッチに対し、前記制御装置のレイヤ2アドレスの解決を要求するパケットを送信し、
前記制御装置は、前記制御装置のレイヤ2アドレスの解決を要求するパケットのいずれか一つに対して応答する代替制御チャネル管理部を備える通信システム。
[第3の形態]
第2の形態の通信システムにおいて、
前記代替制御チャネル管理部は、最初に到達した制御装置のレイヤ2アドレスの解決を要求するパケットに応答する通信システム。
[第4の形態]
第1から第3いずれか一の形態の通信システムにおいて、
前記制御装置は、前記制御装置と他のスイッチ間の制御用パケットを前記レイヤ2転送部で転送するよう指示する制御情報を、予め各スイッチに設定しておく通信システム。
[第5の形態]
第1から第4いずれか一の形態の通信システムにおいて、
前記制御装置と前記スイッチとの間、又は、前記スイッチ間に、レイヤ2スイッチが配置されている通信システム。
[第6の形態]
(上記第2の視点によるスイッチ参照)
[第7の形態]
第6の形態のスイッチにおいて、
前記制御チャネルの切断を検出した場合、隣接するすべてのスイッチに対し、前記制御装置のレイヤ2アドレスの解決を要求するパケットを送信するスイッチ。
[第8の形態]
第6又は第7の形態のスイッチにおいて、
前記制御装置から設定された制御情報に基づいて、前記制御装置と他のスイッチ間の制御用パケットを前記レイヤ2転送部で転送するスイッチ。
[第9の形態]
(上記第3の視点による制御装置参照)
[第10の形態]
(上記第4の視点による制御用チャネルの構築方法参照)
[第11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10、第11の形態は、第1の形態と同様に、第2~第5の形態に展開することが可能である。
11 制御情報記憶部
12 パケット処理部
13 レイヤ2転送部
14 代替制御チャネル構成部
15 プロトコル処理部
20、20A 制御装置
21 代替制御チャネル管理部
22 スイッチ管理部
23 パケット梱包・振り分け部
24 パケット送受信部
30-1、30-2 レイヤ2スイッチ(L2スイッチ)
211 中継スイッチ選択部
212 中継スイッチ管理部
#1-1、#1-2、#1-3、#2-1 ポート
Claims (10)
- 制御用チャネルを介してスイッチに制御情報を設定することにより前記スイッチを制御する制御装置と、
前記制御装置から設定された制御情報に基づいて受信パケットを処理するパケット処理部と、前記制御装置と他のスイッチ間の制御用パケットの入力ポートを学習し、前記学習結果に基づいて、前記制御用パケットを転送するレイヤ2転送部と、前記制御チャネルの切断を検出した場合、隣接するスイッチに対し、前記制御装置のレイヤ2アドレスの解決を要求するパケットを送信し、前記隣接するスイッチを介して前記制御装置からレイヤ2アドレスを取得し、前記取得したレイヤ2アドレスを用いて前記制御装置に制御用パケットを送信することで、前記制御装置との間に第2の制御チャネルを構成する代替制御チャネル構成部と、を備えるスイッチと、
を含む通信システム。 - 前記スイッチは、前記制御チャネルの切断を検出した場合、隣接するすべてのスイッチに対し、前記制御装置のレイヤ2アドレスの解決を要求するパケットを送信し、
前記制御装置は、前記制御装置のレイヤ2アドレスの解決を要求するパケットのいずれか一つに対して応答する代替制御チャネル管理部を備える請求項1の通信システム。 - 前記代替制御チャネル管理部は、最初に到達した制御装置のレイヤ2アドレスの解決を要求するパケットに応答する請求項2の通信システム。
- 前記制御装置は、前記制御装置と他のスイッチ間の制御用パケットを前記レイヤ2転送部で転送するよう指示する制御情報を、予め各スイッチに設定しておく請求項1から3いずれか一の通信システム。
- 前記制御装置と前記スイッチとの間、又は、前記スイッチ間に、レイヤ2スイッチが配置されている請求項1から4いずれか一の通信システム。
- 制御用チャネルを介してスイッチに制御情報を設定することにより前記スイッチを制御する制御装置から設定された制御情報に基づいて受信パケットを処理するパケット処理部と、
前記制御装置と他のスイッチ間の制御用パケットの入力ポートを学習し、前記学習結果に基づいて、前記制御用パケットを転送するレイヤ2転送部と、
前記制御チャネルの切断を検出した場合、隣接するスイッチに対し、前記制御装置のレイヤ2アドレスの解決を要求するパケットを送信し、前記隣接するスイッチを介して前記制御装置からレイヤ2アドレスを取得し、前記取得したレイヤ2アドレスを用いて前記制御装置に制御用パケットを送信することで、前記制御装置との間に第2の制御チャネルを構成する代替制御チャネル構成部と、
を備えるスイッチ。 - 前記制御チャネルの切断を検出した場合、隣接するすべてのスイッチに対し、前記制御装置のレイヤ2アドレスの解決を要求するパケットを送信する請求項6のスイッチ。
- 前記制御装置から設定された制御情報に基づいて、前記制御装置と他のスイッチ間の制御用パケットを前記レイヤ2転送部で転送する請求項6又は7のスイッチ。
- 制御用チャネルを介してスイッチに制御情報を設定することにより前記スイッチを制御する制御装置であって、
前記制御装置のレイヤ2アドレスの解決を要求するパケットを複数のスイッチから受信した場合、前記パケットのいずれか一つに対して応答する代替制御チャネル管理部を備える制御装置。 - 制御用チャネルを介してスイッチに制御情報を設定することにより前記スイッチを制御する制御装置から設定された制御情報に基づいて受信パケットを処理するパケット処理部と、前記制御装置と他のスイッチ間の制御用パケットの入力ポートを学習し、前記学習結果に基づいて、前記制御用パケットを転送するレイヤ2転送部とを備えるスイッチが、
前記制御チャネルの切断を検出した場合、隣接するスイッチに対し、前記制御装置のレイヤ2アドレスの解決を要求するパケットを送信するステップと、
前記隣接するスイッチを介して前記制御装置からレイヤ2アドレスを取得するステップと、
前記取得したレイヤ2アドレスを用いて前記制御装置に制御用パケットを送信することで、前記制御装置との間に第2の制御チャネルを構成するステップと、
を含む制御用チャネルの構築方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015502936A JP5987971B2 (ja) | 2013-02-26 | 2014-02-25 | 通信システム、スイッチ、制御装置、制御用チャネルの構築方法及びプログラム |
US14/766,008 US9628376B2 (en) | 2013-02-26 | 2014-02-25 | Communication system, switch, controller, method for constructing a control channel and program |
EP14756566.7A EP2963869A4 (en) | 2013-02-26 | 2014-02-25 | COMMUNICATION SYSTEM, SWITCH, CONTROL APPARATUS, CONTROL CHANNEL CONFIGURATION METHOD AND PROGRAM |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013036091 | 2013-02-26 | ||
JP2013-036091 | 2013-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014132967A1 true WO2014132967A1 (ja) | 2014-09-04 |
Family
ID=51428231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/054568 WO2014132967A1 (ja) | 2013-02-26 | 2014-02-25 | 通信システム、スイッチ、制御装置、制御用チャネルの構築方法及びプログラム |
Country Status (4)
Country | Link |
---|---|
US (1) | US9628376B2 (ja) |
EP (1) | EP2963869A4 (ja) |
JP (1) | JP5987971B2 (ja) |
WO (1) | WO2014132967A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015204533A (ja) * | 2014-04-14 | 2015-11-16 | 富士通株式会社 | オープンフロースイッチおよびオープンフローネットワークの障害復旧方法 |
WO2016133043A1 (ja) * | 2015-02-16 | 2016-08-25 | 日本電気株式会社 | 制御装置、通信システム、仮想ネットワークの管理方法及びプログラム |
WO2016133033A1 (ja) * | 2015-02-16 | 2016-08-25 | 日本電気株式会社 | 制御装置、通信システム、仮想ネットワークの管理方法及びプログラム |
JP2019041368A (ja) * | 2017-08-25 | 2019-03-14 | 日本電信電話株式会社 | 転送装置、転送システム、転送方法、およびプログラム |
JP2020049769A (ja) * | 2018-09-26 | 2020-04-02 | 住友重機械工業株式会社 | 射出成形システム、射出成形機 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104426789B (zh) * | 2013-08-23 | 2017-08-11 | 新华三技术有限公司 | 软件定义网络中的转发设备控制方法及设备 |
EP2919423B1 (en) * | 2014-03-12 | 2018-11-14 | Xieon Networks S.à.r.l. | A network element of a software-defined network |
US11709681B2 (en) * | 2017-12-11 | 2023-07-25 | Advanced Micro Devices, Inc. | Differential pipeline delays in a coprocessor |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011083846A1 (ja) * | 2010-01-08 | 2011-07-14 | 日本電気株式会社 | 通信システム、転送ノード、経路管理サーバおよび通信方法 |
WO2011083785A1 (ja) * | 2010-01-05 | 2011-07-14 | 日本電気株式会社 | ネットワークシステム、及びネットワーク冗長化方法 |
WO2012165446A1 (ja) * | 2011-05-30 | 2012-12-06 | 日本電気株式会社 | 通信経路制御システム、及び通信経路制御方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7742457B2 (en) * | 2006-06-29 | 2010-06-22 | Scientific-Atlanta, Llc | Systems and methods of configuring a layer-2 switch for multicast filtering |
HUP1000010A2 (en) | 2010-01-08 | 2011-11-28 | Sanofi Sa | Process for producing dronedarone |
-
2014
- 2014-02-25 JP JP2015502936A patent/JP5987971B2/ja not_active Expired - Fee Related
- 2014-02-25 US US14/766,008 patent/US9628376B2/en not_active Expired - Fee Related
- 2014-02-25 WO PCT/JP2014/054568 patent/WO2014132967A1/ja active Application Filing
- 2014-02-25 EP EP14756566.7A patent/EP2963869A4/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011083785A1 (ja) * | 2010-01-05 | 2011-07-14 | 日本電気株式会社 | ネットワークシステム、及びネットワーク冗長化方法 |
WO2011083846A1 (ja) * | 2010-01-08 | 2011-07-14 | 日本電気株式会社 | 通信システム、転送ノード、経路管理サーバおよび通信方法 |
WO2012165446A1 (ja) * | 2011-05-30 | 2012-12-06 | 日本電気株式会社 | 通信経路制御システム、及び通信経路制御方法 |
Non-Patent Citations (4)
Title |
---|
NICK MCKEOWN, OPENFLOW: ENABLING INNOVATION IN CAMPUS NETWORKS, 9 January 2013 (2013-01-09), Retrieved from the Internet <URL:http://www.openflow.org/documents/openflow-wp-latest.pdf> |
OPENFLOW SWITCH SPECIFICATION, 9 January 2013 (2013-01-09), Retrieved from the Internet <URL:https://www.opennetworking.org/images/stories/downloads/speci fi cat ion/open flow-spec-vl.3. l .pdf> |
See also references of EP2963869A4 |
TOSHIO KOIDE; HIDEYUKI SHIMONISHI; SHINGAKU-GIHOU: "A study on the automatic construction mechanism of control network in OpenFlow-based network", SOCIETY OF ELECTRONIC INFORMATION COMMUNICATION, A BODY CORPORATE, vol. 109, no. 448, March 2010 (2010-03-01), pages 19 - 24, XP008174257 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015204533A (ja) * | 2014-04-14 | 2015-11-16 | 富士通株式会社 | オープンフロースイッチおよびオープンフローネットワークの障害復旧方法 |
WO2016133043A1 (ja) * | 2015-02-16 | 2016-08-25 | 日本電気株式会社 | 制御装置、通信システム、仮想ネットワークの管理方法及びプログラム |
WO2016133033A1 (ja) * | 2015-02-16 | 2016-08-25 | 日本電気株式会社 | 制御装置、通信システム、仮想ネットワークの管理方法及びプログラム |
JP2019041368A (ja) * | 2017-08-25 | 2019-03-14 | 日本電信電話株式会社 | 転送装置、転送システム、転送方法、およびプログラム |
JP2020049769A (ja) * | 2018-09-26 | 2020-04-02 | 住友重機械工業株式会社 | 射出成形システム、射出成形機 |
JP7186565B2 (ja) | 2018-09-26 | 2022-12-09 | 住友重機械工業株式会社 | 射出成形システム、射出成形機 |
Also Published As
Publication number | Publication date |
---|---|
JP5987971B2 (ja) | 2016-09-07 |
US20150381476A1 (en) | 2015-12-31 |
US9628376B2 (en) | 2017-04-18 |
JPWO2014132967A1 (ja) | 2017-02-02 |
EP2963869A4 (en) | 2016-09-28 |
EP2963869A1 (en) | 2016-01-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5987971B2 (ja) | 通信システム、スイッチ、制御装置、制御用チャネルの構築方法及びプログラム | |
JP5590263B2 (ja) | 情報システム、制御装置、仮想ネットワークの提供方法およびプログラム | |
JP5939353B2 (ja) | 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 | |
CN103763207A (zh) | 软件定义网络中的带内控制连接建立方法及设备 | |
WO2012050071A1 (ja) | 通信システム、制御装置、処理規則の設定方法およびプログラム | |
JP5818268B2 (ja) | 通信システム、制御装置、経路制御方法およびプログラム | |
JP6064989B2 (ja) | 制御装置、通信システム、ノード制御方法及びプログラム | |
WO2014129624A1 (ja) | 制御装置、通信システム、経路切替方法及びプログラム | |
WO2013176262A1 (ja) | パケット転送システム、制御装置、パケット転送方法及びプログラム | |
US20150256455A1 (en) | Communication system, path information exchange apparatus, communication node, forwarding method for path information and program | |
WO2015151442A1 (ja) | 通信システム、通信方法および制御装置 | |
CN104221337B (zh) | 通信系统、控制装置、通信装置、信息中继方法 | |
JP6544242B2 (ja) | パケット転送システム、制御装置、中継装置の制御方法及びプログラム | |
JP6127569B2 (ja) | スイッチ、制御装置、通信システム、制御チャネルの管理方法及びプログラム | |
JP6206493B2 (ja) | 制御装置、通信システム、中継装置の制御方法及びプログラム | |
JP6024761B2 (ja) | 制御装置、通信システム、通信方法及びプログラム | |
CN104067564A (zh) | 用于光纤通道的域间链接 | |
JP5776978B2 (ja) | ネットワーク中継システム及びネットワーク中継システムの自動設定方法 | |
WO2014087993A1 (ja) | 制御装置、通信システム、通信方法及びプログラム | |
JP2018113564A (ja) | 通信システム、スイッチ、制御装置、通信方法、および、プログラム |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14756566 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14766008 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2014756566 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2015502936 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |