WO2016037443A1 - 一种临时通道的建立方法、设备、系统和计算机存储介质 - Google Patents

一种临时通道的建立方法、设备、系统和计算机存储介质 Download PDF

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Publication number
WO2016037443A1
WO2016037443A1 PCT/CN2014/094643 CN2014094643W WO2016037443A1 WO 2016037443 A1 WO2016037443 A1 WO 2016037443A1 CN 2014094643 W CN2014094643 W CN 2014094643W WO 2016037443 A1 WO2016037443 A1 WO 2016037443A1
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Prior art keywords
switch
controller
channel
temporary
temporary channel
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PCT/CN2014/094643
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English (en)
French (fr)
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肖敏
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中兴通讯股份有限公司
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Publication of WO2016037443A1 publication Critical patent/WO2016037443A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/34—Signalling channels for network management communication
    • H04L41/342—Signalling channels for network management communication between virtual entities, e.g. orchestrators, SDN or NFV entities
    • 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
    • H04L41/34—Signalling channels for network management communication
    • H04L41/344—Out-of-band transfers

Definitions

  • the present invention relates to a Software Defined Network (SDN) technology, and in particular, to a method, a device, a system, and a computer storage medium for establishing a temporary channel.
  • SDN Software Defined Network
  • An OpenFlow network uses an architecture in which the control plane is separated from the forwarding plane.
  • the control plane of the OpenFlow network is implemented by the OpenFlow controller.
  • the forwarding plane of the OpenFlow network is implemented by the OpenFlow switch.
  • the OpenFlow controller sends a flow table to the OpenFlow switch through the control channel to control data forwarding and implement data forwarding. Separation of routing control.
  • the OpenFlow controller can establish an out-of-band connection with an OpenFlow switch through an Out-of-Band OpenFlow channel, or an in-band connection to an OpenFlow switch through an In-Band OpenFlow channel.
  • the out-of-band OpenFlow channel refers to the OpenFlow controller and the OpenFlow switch connected through a direct physical link or a traditional routing/switching network independent of the OpenFlow data plane as a dedicated control channel;
  • the in-band OpenFlow channel refers to an OpenFlow controller.
  • OpenFlow controller To improve the reliability of the control channel, the current industry generally protects the OpenFlow channel based on the idea of OpenFlow controller redundancy.
  • two OpenFlow controllers are deployed simultaneously in one OpenFlow network, one is an out-of-band OpenFlow controller, and the other is an out-of-band OpenFlow controller.
  • One is an in-band OpenFlow controller, and the out-of-band OpenFlow controller establishes an out-of-band OpenFlow channel with an OpenFlow switch through an out-of-band connection, and configures an in-band connection between the OpenFlow switch and the in-band OpenFlow controller and establishes an in-band OpenFlow channel.
  • embodiments of the present invention are expected to provide a temporary channel establishment method, device, system, and computer storage medium, which reduce the cost of network deployment.
  • an embodiment of the present invention provides a method for establishing a temporary channel, where the method includes:
  • the controller After the controller determines that the first switch has the capability of establishing the temporary channel, the controller selects the second switch according to the preset temporary channel establishment policy when the controller detects that the first control channel is faulty, where The first control channel is a control channel between the controller and the first switch, and the second switch is adjacent to the first switch;
  • the controller forwards a temporary channel establishment request message to the first switch by using the second switch, where the temporary channel establishment request message is used to request the first switch to establish the controller and the first a temporary channel between the switches, wherein the temporary channel is a channel between the controller and the first switch and the second switch is a transit node;
  • the controller After receiving the temporary channel setup response message forwarded by the second switch, the controller performs communication interaction with the first switch by using the temporary channel, where the temporary channel setup response message is sent by the first The switch sends to the second switch.
  • the controller determines, by querying the message, that the first switch has the capability of establishing a temporary channel, including:
  • the controller sends a query message to the first switch by using the first control channel,
  • the query message is used to query whether the first switch has the capability of establishing a temporary channel;
  • the controller receives the query response message returned by the first switch by using the first control channel, where the query response message is used to indicate whether the first switch has the capability of establishing a temporary channel;
  • the controller determines that the first switch has the capability of establishing a temporary channel.
  • the controller selects the second switch according to the preset temporary channel establishment policy, including:
  • the controller is configured according to a network topology of each switch connected to the switch, a link bandwidth and occupancy between the switches, a link performance between the switches, and a control channel between the switches and the controller.
  • the bandwidth and occupancy and the performance of the control channel between each switch and the controller are selected from the switches adjacent to the first switch according to a preset selection rule.
  • the controller forwards the temporary channel establishment request message to the first switch by using the second switch, including:
  • the controller sends a first Packet_out message to the second switch by using a second control channel, where the second control channel is a control channel between the controller and the second switch, where the first The Packet_out message encapsulates the temporary channel setup request message, and the first Packet_out message is used to instruct the second switch to forward the temporary channel setup request message to the first switch.
  • the controller receives the temporary channel setup response message forwarded by the second switch, including:
  • the controller receives a first Packet_in message sent by the second switch by using a second control channel, where the second control channel is a control channel between the controller and the second switch;
  • the temporary packet setup response message received by the second switch from the first switch is encapsulated in a first Packet_in message;
  • the controller decapsulates the first Packet_in message to obtain the temporary channel setup response message.
  • the temporary channel includes: a second control channel and a data forwarding link between the second switch and the first switch.
  • the method further includes:
  • the controller During the communication interaction between the controller and the first switch through the temporary channel, when the controller detects that the first control channel returns to normal, the controller sets itself and the first The temporary channel in which a switch performs communication interaction switches to the first control channel.
  • an embodiment of the present invention provides a method for establishing a temporary channel, where the method includes:
  • the first switch After receiving the query message sent by the controller through the first control channel, the first switch determines whether it has the capability of establishing a temporary channel; wherein the first control channel is the controller and the first switch Control channel between
  • the first switch sends an inquiry response message to the controller, where the query response message is used to indicate whether the first switch has the capability of establishing a temporary channel;
  • the first switch When the first switch has the capability of establishing a temporary channel, and the first switch detects that the first control channel is faulty, the first switch receives a temporary channel establishment request that is forwarded by the controller through the second switch. a message, wherein the second switch is selected by the controller according to a preset temporary channel establishment policy, where the temporary channel establishment request message is used to request the first switch to establish the controller and the first a temporary channel between the switches, wherein the temporary channel is a channel between the controller and the first switch and the second switch is a transit node;
  • the first switch forwards a temporary channel setup response message to the controller through the second switch, and performs communication interaction with the controller through the temporary channel.
  • the first switch determines whether it has the capability of establishing a temporary channel, include:
  • the first switch When the first switch has a LOCAL port defined by an OpenFlow switch specification, and the first switch has configured a flow table that outputs an OpenFlow protocol message sent by the controller from the LOCAL port, and the first switch The first switch determines that it has the ability to establish a temporary channel when it has the ability to transmit the OpenFlow protocol message output by the LOCAL port to the local OpenFlow protocol stack for processing.
  • the first switch receives a temporary channel establishment request message that is forwarded by the controller by using the second switch, and includes:
  • the first switch receives the temporary channel setup request message sent by the second switch according to the port indicated by the first Packet_out message; wherein the first Packet_out message encapsulates the temporary channel setup request message;
  • the temporary channel establishment request message is obtained by decapsulating the first Packet_out message by the second switch after receiving the first Packet_out message from the controller by using the second control channel;
  • the second control channel is a control channel between the controller and the second switch.
  • the temporary channel includes: the second control channel and a data forwarding link between the second switch and the first switch.
  • an embodiment of the present invention provides a controller, where the controller includes: a determining unit, a detecting unit, a selecting unit, a sending unit, a receiving unit, and an interaction unit, where
  • the determining unit is configured to determine, by querying the message, that the first switch has the capability of establishing a temporary channel
  • the detecting unit is configured to detect that the first control channel is faulty, and when detecting that the first control channel is faulty, triggering the selecting unit; wherein the first control channel is the controller and the a control channel between the first switches;
  • the selecting unit is configured to: when the detecting unit detects that the first control channel is faulty, select a second switch according to a preset temporary channel establishment policy, where the second switch and the first switch Adjacent connection
  • the sending unit is configured to forward a temporary channel setup request message to the first switch by using the second switch, where the temporary channel setup request message is used to request the first switch to establish the controller and the a temporary channel between the first switch, the temporary channel is a channel between the controller and the first switch, and the second switch is a transit node;
  • the receiving unit is configured to receive a temporary channel setup response message forwarded by the second switch, where the temporary channel setup response message is sent by the first switch to the second switch;
  • the interaction unit is configured to perform communication interaction with the first switch through the temporary channel after the receiving unit receives the temporary channel setup response message.
  • the determining unit is configured to:
  • the controller determines that the first switch has the capability of establishing a temporary channel.
  • the selecting unit is configured according to a network topology of each switch connected to the controller, a link bandwidth and occupancy between the switches, a link performance between the switches, and each switch.
  • the bandwidth and occupancy of the control channel with the controller and the performance of the control channel between each switch and the controller are selected from the switches adjacent to the first switch according to a preset selection rule. switch.
  • the sending unit is configured to send a first Packet_out message to the second switch by using a second control channel, where the second control channel is between the controller and the second switch.
  • Control channel the first Packet_out message encapsulates the Pro
  • the time channel setup request message is used, and the first Packet_out message is used to instruct the second switch to forward the temporary channel setup request message to the first switch.
  • the receiving unit is configured to receive, by using the second control channel, a first Packet_in message sent by the second switch, where the second control channel is the controller and the second switch Inter-control channel; the first Packet_in message encapsulates the temporary channel setup response message received by the second switch from the first switch;
  • the temporary channel includes: the second control channel and a data forwarding link between the second switch and the first switch.
  • the detecting unit is further configured to: during the communication interaction between the interaction unit and the first switch by using the temporary channel, detecting the first control channel;
  • the controller further includes a switching unit configured to switch the temporary channel in which the interaction unit communicates with the first switch to the temporary channel when the detecting unit detects that the first control channel returns to normal The first control channel is described.
  • an embodiment of the present invention provides a first switch, where the first switch includes a receiving unit, a determining unit, a sending unit, a detecting unit, and an interaction unit, where
  • the receiving unit is configured to receive a query message sent by the controller through the first control channel, where the first control channel is a control channel between the controller and the first switch;
  • the determining unit is configured to determine, after the receiving unit receives the query message sent by the controller through the first control channel, whether the first switch itself has the capability of establishing a temporary channel;
  • the sending unit is configured to send a query response message to the controller, where the query response message is used to indicate whether the first switch has the capability of establishing a temporary channel;
  • the detecting unit is configured to detect whether the first control channel is faulty, and when detecting that the first control channel is faulty, triggering the receiving unit;
  • the receiving unit is further configured to: when the detecting unit detects that the first control channel is faulty, receive a temporary channel establishment request message that is forwarded by the controller by using the second switch; wherein, the second switch is configured by The controller selects a policy according to a preset temporary channel establishment request, and the temporary channel establishment request message is used to request the first switch to establish a temporary channel between the controller and the first switch, where the temporary a channel is a channel between the controller and the first switch and the second switch is a transit node;
  • the sending unit is further configured to forward a temporary channel setup response message to the controller by using the second switch;
  • the interaction unit is configured to perform communication interaction with the controller through the temporary channel.
  • the determining unit is configured to: when the first switch has a LOCAL port defined by an OpenFlow switch specification, and the first switch has configured an OpenFlow protocol message sent by the controller from the LOCAL port. And determining, by the first switch, the capability of establishing the temporary channel when the first switch is configured to transmit the OpenFlow protocol message output by the LOCAL port to the local OpenFlow protocol stack for processing.
  • the receiving unit is configured to receive the temporary channel setup request message sent by the second switch according to the port indicated by the first Packet_out message; wherein the first Packet_out message encapsulates the temporary channel Establishing a request message; the temporary channel establishment request message is obtained by decapsulating the first Packet_out message by the second switch after receiving the first Packet_out message from the controller by using the second control channel;
  • the second control channel is a control channel between the controller and the second switch.
  • the temporary channel includes: the second control channel and a data forwarding link between the second switch and the first switch.
  • an embodiment of the present invention provides a system for establishing a temporary channel, where the system The method includes: a controller, a first switch, and a second switch, wherein
  • the controller is configured to:
  • the controller After determining, by the query message, that the first switch has the capability of establishing the temporary channel, when the controller detects that the first control channel is faulty, the controller selects the second switch according to the preset temporary channel establishment policy, where the The first control channel is a control channel between the controller and the first switch, and the second switch is adjacent to the first switch;
  • the first switch is configured to:
  • the embodiment of the present invention further provides a computer storage medium, where the storage medium includes a set of computer executable instructions, and the instructions are used to execute a method for establishing a temporary channel on a controller side according to an embodiment of the present invention. .
  • the embodiment of the present invention further provides a computer storage medium, where the storage medium includes a set of computer executable instructions, and the instructions are used to perform establishment of a temporary channel on a first switch side according to an embodiment of the present invention. method.
  • Embodiments of the present invention provide a temporary channel establishment method, device, system, and computer storage medium.
  • the controller establishes a temporary channel between the controller and the channel failure switch by selecting an optimal switch adjacent to the channel failure switch, thereby There is no need to set up a redundant controller for each switch as a backup, thus reducing the cost of network deployment.
  • FIG. 1 is a schematic structural diagram of an OpenFlow network component according to an embodiment of the present disclosure
  • FIG. 2 is a schematic flowchart of a method for establishing a temporary channel according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of determining, by a query message, that a first switch has the capability of establishing a temporary channel by using a query message according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart of another method for establishing a temporary channel according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a method for establishing a detailed temporary channel according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a controller according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of another controller according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a first switch according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a system for establishing a temporary channel according to an embodiment of the present invention.
  • FIG. 1 shows an OpenFlow network component architecture provided by an embodiment of the present invention, which may be used by those skilled in the art. It can be understood that the technical solution of the present invention can be applied to other similar scenarios without creative labor, and will not be described later.
  • the OpenFlow controller controls OpenFlow switch 1, OpenFlow switch 2, OpenFlow switch 3, and OpenFlow switch 4.
  • each control channel can be The out-of-band OpenFlow channel can also be an in-band OpenFlow channel; and OpenFlow switch 1, OpenFlow switch 2, OpenFlow switch 3, and OpenFlow switch 4 have data forwarding links between them, as indicated by the thin arrows in the figure.
  • OpenFlow switch 3 is used as the first switch as an example.
  • FIG. 2 a flow of a method for establishing a temporary channel according to an embodiment of the present invention is shown.
  • the method may be applied to a controller, and the method may include:
  • the first control channel is a control channel between the controller and the first switch, and may be an in-band OpenFlow channel or an out-of-band OpenFlow channel; the second switch and the first switch Adjacent connection
  • the controller determines, by querying the message, that the first switch has the capability of establishing a temporary channel, and may include S301 to S303:
  • S301 The controller sends a query message to the first switch by using a first control channel.
  • the query message is used to query whether the first switch has the capability of establishing a temporary channel. It should be noted that, because the query message is a start event of the controller to know whether each switch has the capability of establishing a temporary channel, the controller may In the network architecture, when the control channel between the controller and the switch is successfully established, an inquiry message is sent to the switch to query whether the switch supports establishing a temporary channel.
  • S302 The controller receives a query response message that is returned by the first switch by using the first control channel.
  • the query response message is used to indicate whether the first switch has the capability of establishing a temporary channel
  • the OpenFlow controller sends an inquiry message to the OpenFlow switch 3 through the first control channel, and receives the query response message returned by the OpenFlow switch 3 through the first control channel, and determines that the OpenFlow switch 3 is configured according to the query response message.
  • Established temporary access capabilities for example, in this embodiment, the OpenFlow controller sends an inquiry message to the OpenFlow switch 3 through the first control channel, and receives the query response message returned by the OpenFlow switch 3 through the first control channel, and determines that the OpenFlow switch 3 is configured according to the query response message.
  • Established temporary access capabilities are examples of the OpenFlow switch 3 through the first control channel.
  • the controller selects the second switch according to the preset temporary channel establishment policy, and may include:
  • the controller is configured according to a network topology of each switch connected to the switch, a link bandwidth and occupancy between the switches, a link performance between the switches, and a control channel between the switches and the controller. Bandwidth and occupancy, and performance of the control channel between each switch and the controller, selecting a second switch from a switch adjacent to the first switch according to a preset selection rule;
  • the OpenFlow controller may be configured according to the network topology of each switch in the current network environment, the link bandwidth and occupancy between the switches, the link performance between the switches, and the switches.
  • the bandwidth and occupancy of the control channel between the OpenFlow controllers and the performance of the control channel between the switches and the OpenFlow controller are optimized from the OpenFlow switch 1, the OpenFlow switch 2, and the OpenFlow switch 4 connected to the OpenFlow switch 3. Select to select OpenFlow Switch 2 as the second switch.
  • S202 The controller forwards the temporary channel establishment request message to the first switch by using the second switch.
  • the temporary channel establishment request message is used to request the first switch to establish a temporary channel between the controller and the first switch, where the temporary channel is the control a channel between the controller and the first switch and the second switch as a transit node;
  • the controller forwards the temporary channel establishment request message to the first switch by using the second switch, including:
  • the controller sends a first Packet_out (referred to as P_o) message to the second switch by using a second control channel, where the second control channel is a control channel between the controller and the second switch,
  • the first Packet_out message encapsulates the temporary channel setup request message, and the first Packet_out message is used to instruct the second switch to forward the temporary channel setup request message to the first switch;
  • the channel may include: the second control channel and a data forwarding link between the second switch and the first switch;
  • the OpenFlow controller sends a first Packet_out message encapsulating the temporary channel setup request message to the OpenFlow switch 2 through a control channel between the OpenFlow switch 2, and the first Packet_out message is used to indicate OpenFlow.
  • the switch 2 forwards the temporary channel setup request message to the OpenFlow switch 3 through the data forwarding link between the OpenFlow switch 2 and the OpenFlow switch 3; the temporary channel setup request message is used to request the OpenFlow switch 3 to establish an OpenFlow controller and A temporary channel between OpenFlow switches 3.
  • the temporary channel between the OpenFlow controller and the OpenFlow switch 3 may include: a control channel between the OpenFlow controller and the OpenFlow switch 2, and a data forwarding link between the OpenFlow switch 2 and the OpenFlow switch 3, thereby It is known that the temporary channel between the OpenFlow controller and the OpenFlow switch 3 is an in-band OpenFlow channel between an OpenFlow controller and an OpenFlow switch 3.
  • the controller receives the temporary channel setup response message forwarded by the second switch, including:
  • the controller decapsulates the first Packet_in message to obtain the temporary channel setup response message.
  • the second control channel is a control channel between the controller and the second switch; the first Packet_in message encapsulates the temporary received by the second switch from the first switch Channel setup response message.
  • the temporary channel setup response message is sent by the first switch to the second switch.
  • the temporary channel setup response message is that the OpenFlow switch 3 passes the OpenFlow switch 2 and the OpenFlow switch 3.
  • the data forwarding link is sent to the OpenFlow switch 2; after receiving the temporary channel setup response message, the OpenFlow switch 2 encapsulates the temporary channel setup response message in the first Packet_in message, and the first Packet_in message is received. Transfer to the controller via the second control channel.
  • the method may further include:
  • the controller During the communication interaction between the controller and the first switch through the temporary channel, when the controller detects that the first control channel returns to normal, the controller sets itself and the first The temporary channel in which a switch performs communication interaction switches to the first control channel.
  • the embodiment of the invention provides a method for establishing a temporary channel.
  • the controller establishes a temporary channel between the controller and the channel fault switch by selecting an optimal switch adjacent to the channel fault switch, so that it is not necessary to set one for each switch. Redundant controllers are used as backups, thus reducing the cost of network deployment.
  • FIG. 4 shows another method for establishing a temporary channel according to an embodiment of the present invention.
  • the method may be applied to a first switch, and the method may include :
  • the first switch After receiving the query message sent by the controller through the first control channel, the first switch determines whether it has the capability of establishing a temporary channel.
  • the first control channel is a control channel between the controller and the first switch
  • the query message is the start event of the controller to know whether each switch has the ability to establish a temporary channel
  • the switch will receive the switch immediately.
  • the query message sent by the controller is used to query whether the switch supports establishing a temporary channel.
  • the first switch determines whether it has the capability of establishing a temporary channel, including:
  • the first switch When the first switch has a LOCAL port defined by an OpenFlow switch specification, and the first switch has configured a flow table that outputs an OpenFlow protocol message sent by the controller from the LOCAL port, and the first switch The first switch determines that it has the ability to establish a temporary channel when it has the ability to transmit the OpenFlow protocol message output by the LOCAL port to the local OpenFlow protocol stack for processing.
  • S402 The first switch sends a query response message to the controller.
  • the query response message is used to indicate whether the first switch has the capability of establishing a temporary channel
  • the second switch is selected by the controller according to a preset temporary channel establishment request, where the temporary channel establishment request message is used to request the first switch to establish the controller and the first a temporary channel between the switches, wherein the temporary channel is a channel between the controller and the first switch and the second switch is a transit node;
  • the first switch receives a temporary channel setup request message that is forwarded by the controller by using the second switch, and includes:
  • the temporary channel includes: the second control channel and a data forwarding link between the second switch and the first switch.
  • S404 The first switch forwards the temporary channel setup response message to the controller by using the second switch, and performs communication interaction with the controller through the temporary channel.
  • the embodiment of the invention provides a method for establishing a temporary channel.
  • the controller establishes a temporary channel between the controller and the channel fault switch by selecting an optimal switch adjacent to the channel fault switch, so that it is not necessary to set one for each switch. Redundant controllers are used as backups, thus reducing the cost of network deployment.
  • FIG. 5 is a flowchart showing a method for establishing a detailed temporary channel according to an embodiment of the present invention.
  • the OpenFlow switch 3 is used as the first switch as an example. It can be understood that the present embodiment can be applied to the OpenFlow switch 1, the OpenFlow switch 2, and the OpenFlow switch 4. No restrictions are imposed.
  • the method can include:
  • the OpenFlow controller sends a query message to the OpenFlow switch 3 by using a first control channel between the OpenFlow controller and the OpenFlow switch 3;
  • the first control channel between the OpenFlow controller and the OpenFlow switch 3 may be an in-band OpenFlow channel or an out-of-band OpenFlow channel, which is not specifically limited in this embodiment.
  • the query message is used to query whether the OpenFlow switch 3 has the capability of establishing a temporary channel; it should be noted that since the query message is an OpenFlow controller, each OpenFlow is known. Whether the switch has the initial event of establishing the temporary channel capability. Therefore, the OpenFlow controller can send a query message to the OpenFlow switch 3 immediately after the control channel between the OpenFlow controller and the OpenFlow switch 3 is successfully established in the network architecture. To query whether OpenFlow switch 3 supports the establishment of a temporary channel. It can be understood that the OpenFlow controller can also send query messages to the OpenFlow switch 1, the OpenFlow switch 2, and the OpenFlow switch 4 through their respective control channels, so that the OpenFlow controller can know whether each OpenFlow switch has the capability of establishing a temporary channel.
  • the OpenFlow switch 3 After receiving the query message sent by the OpenFlow controller through the first control channel, the OpenFlow switch 3 determines whether it has the capability of establishing a temporary channel.
  • the OpenFlow switch 3 determines whether it has the capability of establishing a temporary channel, including:
  • the OpenFlow switch 3 When the OpenFlow switch 3 has the LOCAL port defined by the OpenFlow switch specification, and the OpenFlow switch 3 has configured a flow table for outputting the OpenFlow protocol message sent by the OpenFlow controller from the LOCAL port, and the OpenFlow switch 3 is configured to output the LOCAL port.
  • the OpenFlow protocol message When the OpenFlow protocol message is transmitted to the local OpenFlow protocol stack for processing, the OpenFlow switch 3 determines that it has the ability to establish a temporary channel; otherwise, the OpenFlow switch 3 determines that it does not have the ability to establish a temporary channel.
  • the OpenFlow switch 1, the OpenFlow switch 2, and the OpenFlow switch 4 can also determine whether they have the ability to establish a temporary channel according to the above manner.
  • S503 The OpenFlow switch 3 sends an inquiry response message to the OpenFlow controller by using the first control channel.
  • the query response message is used to indicate whether the OpenFlow switch 3 has the capability of establishing a temporary channel
  • the OpenFlow controller can only take control channels between the OpenFlow switch and the OpenFlow controller.
  • a temporary channel is established between the OpenFlow switch and the OpenFlow switch. If the OpenFlow switch does not have the ability to establish a temporary channel, the OpenFlow controller does not establish a connection with the OpenFlow switch when the control channel between the OpenFlow switch and the OpenFlow controller fails. Temporary access.
  • the OpenFlow switch 3 is configured to have the capability of establishing a temporary channel. Therefore, the embodiment further includes the following steps:
  • an OpenFlow control channel can be monitored between the OpenFlow controller and the OpenFlow switch by periodically sending Echo messages.
  • the OpenFlow controller selects the second switch according to the preset temporary channel establishment policy, and may include: the OpenFlow controller according to the network topology of each OpenFlow switch connected to itself, and the link bandwidth between the OpenFlow switches. And the occupancy, the link performance between the OpenFlow switches, the bandwidth and occupancy of the control channel between each OpenFlow switch and the OpenFlow controller, and the performance of the control channel between each OpenFlow switch and the OpenFlow controller according to preset selection rules. For example, the rule that the maximum link bandwidth is the largest, the link occupancy is the smallest, the link performance is optimal, and the control channel performance is optimal, and the second switch is selected from the OpenFlow switch connected to the OpenFlow switch 3; in this embodiment, the second The switch can be OpenFlow Switch 2.
  • the OpenFlow controller sends the first Packet_out message encapsulating the temporary channel setup request message to the OpenFlow switch 2 through the second control channel;
  • the Packet_out message is an OpenFlow protocol message sent by the OpenFlow controller to the OpenFlow switch; the OpenFlow controller request is encapsulated in the Packet_out message.
  • the packet processed by the OpenFlow switch specifies how the OpenFlow switch processes the encapsulated packets.
  • the first Packet_out message may instruct the OpenFlow switch 2 to output the temporary channel setup request message encapsulated in the first Packet_out message from the port connected to the OpenFlow switch 3, so that the OpenFlow switch 2 forwards the encapsulated temporary The channel setup request message is sent to the OpenFlow switch 3.
  • the second control channel may be an in-band OpenFlow channel or an out-of-band OpenFlow channel, which is not specifically limited in this embodiment.
  • the OpenFlow switch 2 since the OpenFlow switch 2 and the OpenFlow switch 3 are previously connected through a data forwarding link, the OpenFlow switch 2 will pass the first Packet_out message through the data forwarding link according to the indication of the first Packet_out message received from the OpenFlow controller.
  • the temporary channel establishment request message is sent to the OpenFlow switch 3.
  • the OpenFlow switch 3 can also detect the first control channel. When it is detected that the first control channel fails, the OpenFlow switch 3 will wait for the temporary channel setup request message sent by the OpenFlow controller; therefore, After receiving the temporary channel establishment request message from the OpenFlow switch 2, the OpenFlow switch 3 generates a temporary channel setup response message and transmits a temporary channel setup response message to the OpenFlow switch 2.
  • the OpenFlow controller since the OpenFlow switch 3 receives the temporary channel setup request message from the OpenFlow switch 2, the OpenFlow controller has selected the OpenFlow switch 2 as the transit node of the temporary channel.
  • the flow table instruction executed in this embodiment is “execution action ⁇ output from LOCAL port ⁇ ”, that is, matching
  • the successful temporary channel setup request message of the flow table is output from the LOCAL port to the local network protocol stack of OpenFlow switch 3.
  • the temporary channel establishment request message is a TCP connection establishment request message
  • the local network protocol stack of the OpenFlow switch 3 having the capability of establishing a temporary channel certainly supports the TCP protocol, and thus receives the OpenFlow from the LOCAL port.
  • the OpenFlow switch 2 replies to the temporary channel establishment response message with the OpenFlow controller IP address as the destination IP address, that is, the TCP connection establishment response message.
  • the OpenFlow switch 2 encapsulates the temporary channel setup response message in the first Packet_in message, and sends the first Packet_in message to the OpenFlow controller through the second control channel.
  • the Packet_in message is an OpenFlow protocol message sent by the OpenFlow switch to the OpenFlow controller.
  • the Packet_in message encapsulates the packet that the OpenFlow switch wants to process by the OpenFlow controller.
  • the packet received by the OpenFlow switch cannot match the flow table by default.
  • the encapsulation is sent to the OpenFlow controller for processing in the Packet_in message.
  • the OpenFlow switch 2 receives the temporary channel setup response message sent from the OpenFlow switch 3
  • the OpenFlow switch 2 will temporarily disable the temporary channel setup response message because the configured flow table on the OpenFlow switch 2 cannot be successfully matched.
  • the channel setup response message is encapsulated into the first Packet_in message and sent to the OpenFlow controller.
  • the OpenFlow controller decapsulates the first Packet_in message to obtain a temporary channel setup response message originating from the OpenFlow switch 3.
  • the OpenFlow controller and the OpenFlow switch 3 establish a temporary channel with the OpenFlow switch 2 as the transit node, thereby achieving the purpose of restoring the first control channel that fails between the OpenFlow controller and the OpenFlow switch 3.
  • the OpenFlow controller and the OpenFlow switch 3 can exchange OpenFlow protocol messages through the temporary channel.
  • the temporary channel can be composed of the second control channel and the data forwarding link between the OpenFlow switch 2 and the OpenFlow switch 3.
  • the temporary channel is based on the existing control channel, the temporary channel inevitably has the drawback of large overhead and delay, so that the controller passes the During the communication between the temporary channel and the first switch, when the OpenFlow controller detects that the first control channel returns to normal, the OpenFlow controller switches the temporary channel that communicates with the OpenFlow switch 3 to the first channel. A control channel is closed and the temporary channel is closed.
  • the embodiment of the invention provides a method for establishing a temporary channel.
  • the controller establishes a temporary channel between the controller and the channel fault switch by selecting an optimal switch adjacent to the channel fault switch, so that it is not necessary to set one for each switch. Redundant controllers are used as backups, thus reducing the cost of network deployment.
  • the controller 60 may include: a determining unit 601, a detecting unit 602, a selecting unit 603, and a sending. Unit 604, receiving unit 605 and interaction unit 606, wherein
  • the determining unit 601 is configured to determine, by querying the message, that the first switch has the capability of establishing a temporary channel
  • the detecting unit 602 is configured to detect that the first control channel is faulty, and when detecting that the first control channel is faulty, triggering the selecting unit 603; wherein the first control channel is the controller 60 and a control channel between the first switches;
  • the selecting unit 603 is configured to: when the detecting unit 602 detects that the first control channel is faulty, select a second switch according to a preset temporary channel establishing policy, where the second switch and the first a switch is adjacently connected;
  • the sending unit 604 is configured to forward, by using the second switch, a temporary channel setup request message to the first switch, where the temporary channel setup request message is used to request the first switch to establish the controller a temporary channel between the 60 and the first switch, the temporary channel being a channel between the controller 60 and the first switch and the second switch being a transit node;
  • the receiving unit 605 is configured to receive a temporary channel setup response message forwarded by the second switch, where the temporary channel setup response message is sent by the first switch to the second switch;
  • the interaction unit 606 is configured to perform communication interaction with the first switch by using the temporary channel after the receiving unit 605 receives the temporary channel setup response message.
  • the determining unit 601 is configured to:
  • the selecting unit 603 is configured to: according to the network topology of each switch connected to the controller 60, the link bandwidth and occupancy between the switches, and each intersection Link performance between switches, bandwidth and occupancy of control channels between switches and controller 60, and control channel performance between switches and controller 60, according to preset selection rules
  • the second switch is selected from the switches connected to the first switch.
  • the sending unit 604 is configured to: send, by using a second control channel, a first Packet_out message to the second switch, where the second control channel is the controller 60 and the second switch
  • the first packet_out message encapsulates the temporary channel setup request message, and the first Packet_out message is used to instruct the second switch to forward the temporary channel setup request message to the first switch.
  • the temporary channel includes: the second control channel and a data forwarding link between the second switch and the first switch.
  • the receiving unit 605 is configured to: receive, by the second control channel, a first Packet_in message sent by the second switch, where the second control channel is the controller 60 and the second a control channel between the switches; the first Packet_in message encapsulates the temporary channel setup response message received by the second switch from the first switch;
  • the detecting unit 602 is further configured to: when the interaction unit 606 performs communication interaction with the first switch by using the temporary channel, detecting the first control channel;
  • the controller 60 further includes a switching unit 607 configured to communicate the interaction unit with the first switch when the detecting unit 602 detects that the first control channel returns to normal. The temporary channel of interaction is switched to the first control channel.
  • the embodiment of the present invention provides a controller 60.
  • the controller 60 establishes a temporary channel between the controller 60 and the channel failure switch by selecting an optimal switch adjacent to the channel failure switch, so that it is not necessary to set one for each switch. Redundant controllers are used as backups, so they can be reduced The cost of less network deployment.
  • a first switch 80 may include: a receiving unit 801, a determining unit 802, a sending unit 803, a detecting unit 804, and an interaction unit 805, where
  • the receiving unit 801 is configured to receive a query message sent by the controller through the first control channel, where the first control channel is a control channel between the controller and the first switch 80;
  • the determining unit 802 is configured to determine, after the receiving unit 801 receives the query message sent by the controller through the first control channel, whether the first switch 80 itself has the capability of establishing a temporary channel;
  • the sending unit 803 is configured to send a query response message to the controller, where the query response message is used to indicate whether the first switch 80 has the capability of establishing a temporary channel;
  • the detecting unit 804 is configured to detect whether the first control channel is faulty, and when detecting that the first control channel is faulty, triggering the receiving unit 801;
  • the receiving unit 801 is further configured to: when the detecting unit 804 detects that the first control channel is faulty, receive a temporary channel establishment request message that is forwarded by the controller by using the second switch; wherein, the second The switch is selected by the controller according to a preset temporary channel establishment request, and the temporary channel establishment request message is used to request the first switch 80 to establish a temporary channel between the controller and the first switch 80.
  • the temporary channel is a channel between the controller and the first switch 80 and the second switch is a transit node;
  • the sending unit 803 is further configured to forward, by using the second switch, a temporary channel setup response message to the controller;
  • the interaction unit 805 is configured to perform communication interaction with the controller through the temporary channel.
  • the determining unit 802 is configured to: when the first switch 80 is provided with a LOCAL port defined by an OpenFlow switch specification, and the first switch 80 is configured a flow table outputting the OpenFlow protocol message sent by the controller from the LOCAL port, and the first switch 80 is configured to transmit the OpenFlow protocol message output by the LOCAL port to a local OpenFlow protocol stack for processing It is determined that the first switch 80 has the capability of establishing a temporary channel.
  • the receiving unit 801 is configured to: receive the temporary channel setup request message sent by the second switch according to the port indicated by the first Packet_out message; wherein the first Packet_out message encapsulates the temporary a channel establishment request message; the temporary channel establishment request message is obtained by decapsulating the first Packet_out message by the second switch after receiving the first Packet_out message from the controller by using the second control channel;
  • the second control channel is a control channel between the controller and the second switch.
  • the temporary channel includes: the second control channel and a data forwarding link between the second switch and the first switch 80.
  • the embodiment of the present invention provides a first switch 80.
  • the controller establishes a temporary channel between the controller and the first switch 80 by selecting an optimal switch adjacent to the first switch 80, so that it is not required to be set for each switch.
  • a redundant controller acts as a backup, thus reducing the cost of network deployment.
  • the system 90 may include: a controller 60, a first switch 80, and a second switch 100, where
  • the controller 60 is configured to:
  • the controller 60 After determining that the first switch 80 has the capability of establishing the temporary channel, the controller 60 selects the second switch 100 according to the preset temporary channel establishment policy, when the controller 60 detects that the first control channel is faulty.
  • the first control channel is a control channel between the controller 60 and the first switch 80, and the second switch 100 is adjacent to the first switch 80.
  • the temporary channel establishment request message is used to request the first switch 80 to establish a temporary channel between the controller 60 and the first switch 80, where the temporary channel is the control
  • the channel between the device 60 and the first switch 80 and the second switch 100 is a transit node;
  • the first switch 80 is configured to:
  • the first switch 80 when the first switch 80 has the capability of establishing a temporary channel, and the first switch 80 detects that the control channel between itself and the controller 60 is faulty, receiving the controller 60 to pass the a temporary channel establishment request message forwarded by the switch 100;
  • the temporary path establishment response message is forwarded to the controller 60 by the second switch 100, and communicates with the controller 60 through the temporary channel.
  • the embodiment of the present invention provides a temporary channel establishing system 90.
  • the controller 60 establishes a temporary channel between the controller 60 and the first switch 80 by selecting an optimal second switch 100 adjacent to the first switch 80. There is no need to set up a redundant controller for each switch as a backup, thus reducing the cost of network deployment.
  • the embodiment of the present invention further provides a computer storage medium, the storage medium comprising a set of computer executable instructions for performing a method for establishing a temporary channel on a controller side according to an embodiment of the present invention.
  • the embodiment of the present invention further provides a computer storage medium, the storage medium comprising a set of computer executable instructions, the instructions are used to execute the first switch side of the embodiment of the present invention.
  • the method of establishing a temporary channel is a computer storage medium, the storage medium comprising a set of computer executable instructions, the instructions are used to execute the first switch side of the embodiment of the present invention.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明实施例公开了一种临时通道的建立方法、设备、系统和计算机存储介质，该方法可以包括：控制器通过查询消息确定第一交换机具备建立临时通道能力之后，当所述控制器检测到第一控制通道发生故障时，所述控制器根据预设的临时通道建立策略选取第二交换机；所述控制器通过所述第二交换机转发临时通道建立请求消息至所述第一交换机；所述控制器接收到由所述第二交换机转发的临时通道建立响应消息后，通过所述临时通道与所述第一交换机进行通信交互。

Description

一种临时通道的建立方法、设备、系统和计算机存储介质 技术领域
本发明涉及软件定义网络(SDN，Software Defined Network)技术，尤其涉及一种临时通道的建立方法、设备、系统和计算机存储介质。
背景技术
开放流(OpenFlow)网络采用控制平面与转发平面相分离的架构。OpenFlow网络的控制平面由OpenFlow控制器来实现，OpenFlow网络的转发平面由OpenFlow交换机来实现；OpenFlow控制器通过控制通道向OpenFlow交换机下发流表，从而达到控制数据转发的目的，实现了数据转发和路由控制的分离。
目前，OpenFlow控制器既可以通过带外(Out-of-Band)OpenFlow通道与OpenFlow交换机建立带外连接；也可以通过带内(In-Band)OpenFlow通道与OpenFlow交换机建立带内连接。其中，带外OpenFlow通道指的是OpenFlow控制器与OpenFlow交换机通过独立于OpenFlow数据平面的直连物理链路或传统路由/交换网络相连，作为专属控制通道；带内OpenFlow通道指的是OpenFlow控制器与OpenFlow交换机通过OpenFlow数据平面中OpenFlow交换机组成的数据转发网络相连。
为了提高控制通道的可靠性，目前业界通常基于OpenFlow控制器冗余的思想对OpenFlow通道进行保护，比如，在一个OpenFlow网络中同时部署两台OpenFlow控制器，一台是带外OpenFlow控制器，另一台是带内OpenFlow控制器，带外OpenFlow控制器通过带外连接与OpenFlow交换机建立带外OpenFlow通道后，配置OpenFlow交换机与带内OpenFlow控制器之间的带内连接并建立带内OpenFlow通道，带外OpenFlow控制器与 带内OpenFlow控制器之间以及带外OpenFlow通道与带内OpenFlow通道之间互为备份。
但是，基于冗余思想的OpenFlow通道保护方案，需要为每个OpenFlow交换机部署冗余的OpenFlow控制器，因此会造成网络部署的成本较高。
发明内容
为解决上述技术问题，本发明实施例期望提供一种临时通道的建立方法、设备、系统和计算机存储介质，减少网络部署的成本。
本发明实施例的技术方案是这样实现的：
第一方面，本发明实施例提供了一种临时通道的建立方法，所述方法包括：
控制器通过查询消息确定第一交换机具备建立临时通道能力之后，当所述控制器检测到第一控制通道发生故障时，所述控制器根据预设的临时通道建立策略选取第二交换机，其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道，所述第二交换机与所述第一交换机相邻连接；
所述控制器通过所述第二交换机转发临时通道建立请求消息至所述第一交换机；其中，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
所述控制器接收到由所述第二交换机转发的临时通道建立响应消息后，通过所述临时通道与所述第一交换机进行通信交互，其中，所述临时通道建立响应消息由所述第一交换机发送给所述第二交换机。
上述方案中，所述控制器通过查询消息确定第一交换机具备建立临时通道能力，包括：
所述控制器通过所述第一控制通道向所述第一交换机发送查询消息， 其中，所述查询消息用于查询所述第一交换机是否具备建立临时通道能力；
所述控制器接收所述第一交换机通过所述第一控制通道返回的查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
当所述查询响应消息指示所述第一交换机具备建立临时通道能力时，所述控制器确定所述第一交换机具备建立临时通道能力。
上述方案中，所述控制器根据预设的临时通道建立策略选取第二交换机，包括：
所述控制器根据与自身相连的各交换机的网络拓扑结构、所述各交换机之间的链路带宽和占用情况、各交换机之间链路性能、各交换机与所述控制器之间控制通道的带宽和占用情况以及各交换机与所述控制器之间控制通道的性能按照预设的选取规则从与所述第一交换机相邻连接的交换机中选取第二交换机。
上述方案中，所述控制器通过所述第二交换机转发临时通道建立请求消息至所述第一交换机，包括：
所述控制器通过第二控制通道向所述第二交换机发送第一Packet_out消息，其中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道，所述第一Packet_out消息封装了所述临时通道建立请求消息，且所述第一Packet_out消息用于指示所述第二交换机将所述临时通道建立请求消息转发至所述第一交换机。
上述方案中，所述控制器接收到由所述第二交换机转发的临时通道建立响应消息，包括：
所述控制器通过第二控制通道接收由所述第二交换机发送的第一Packet_in消息，其中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道；所述第一Packet_in消息中封装了所述第二交换机从所述第一交换机接收的所述临时通道建立响应消息；
所述控制器将所述第一Packet_in消息进行解封装，获取得到所述临时通道建立响应消息。
上述方案中，所述临时通道包括：第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
上述方案中，所述方法还包括：
在所述控制器通过所述临时通道与所述第一交换机进行通信交互的过程中，当所述控制器检测到所述第一控制通道恢复正常时，所述控制器将自身与所述第一交换机进行通信交互的所述临时通道切换至所述第一控制通道。
第二方面，本发明实施例提供了一种临时通道的建立方法，所述方法包括：
第一交换机在接收到由控制器通过第一控制通道发送的查询消息之后，判断自身是否具备建立临时通道的能力；其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道；
所述第一交换机向所述控制器发送查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
当所述第一交换机具备建立临时通道能力，且所述第一交换机检测到所述第一控制通道发生故障时，所述第一交换机接收所述控制器通过第二交换机转发的临时通道建立请求消息；其中，所述第二交换机由所述控制器根据预设的临时通道建立策略选取，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
所述第一交换机通过所述第二交换机转发临时通道建立响应消息至所述控制器，并通过所述临时通道与所述控制器进行通信交互。
上述方案中，所述第一交换机判断自身是否具备建立临时通道的能力， 包括：
当所述第一交换机具备OpenFlow交换机规范定义的LOCAL端口，且所述第一交换机已配置了将所述控制器发送的OpenFlow协议消息从所述LOCAL端口输出的流表，且所述第一交换机具备将所述LOCAL端口输出的所述OpenFlow协议消息传输至本地OpenFlow协议栈进行处理的能力时，所述第一交换机确定自身具备建立临时通道的能力。
上述方案中，所述第一交换机接收所述控制器通过所述第二交换机转发的临时通道建立请求消息，包括：
所述第一交换机接收由所述第二交换机根据第一Packet_out消息指示的端口发送的所述临时通道建立请求消息；其中，所述第一Packet_out消息封装了所述临时通道建立请求消息；所述临时通道建立请求消息由所述第二交换机通过第二控制通道从所述控制器接收所述第一Packet_out消息之后，对所述第一Packet_out消息进行解封装获取得到；所述第二控制通道为所述控制器与所述第二交换机之间的控制通道。
上述方案中，所述临时通道包括：所述第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
第三方面，本发明实施例提供了一种控制器，所述控制器包括：确定单元、检测单元、选取单元、发送单元、接收单元和交互单元，其中，
所述确定单元，配置为通过查询消息确定第一交换机具备建立临时通道能力；
所述检测单元，配置为检测第一控制通道发生故障，且当检测到所述第一控制通道发生故障时，触发所述选取单元；其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道；
所述选取单元，配置为当所述检测单元检测到所述第一控制通道发生故障时，根据预设的临时通道建立策略选取第二交换机，其中，所述第二交换机与所述第一交换机相邻连接；
所述发送单元，配置为通过所述第二交换机转发临时通道建立请求消息至所述第一交换机；其中，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
所述接收单元，配置为接收由所述第二交换机转发的临时通道建立响应消息，其中，所述临时通道建立响应消息由所述第一交换机发送给所述第二交换机；
所述交互单元，配置为当所述接收单元接收到所述临时通道建立响应消息之后，通过所述临时通道与所述第一交换机进行通信交互。
上述方案中，所述确定单元配置为：
通过所述第一控制通道向所述第一交换机发送查询消息，其中，所述查询消息用于查询所述第一交换机是否具备建立临时通道能力；以及，
接收所述第一交换机通过所述第一控制通道返回的查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；以及，
当所述查询响应消息指示所述第一交换机具备建立临时通道能力时，所述控制器确定所述第一交换机具备建立临时通道能力。
上述方案中，所述选取单元，配置为根据与所述控制器相连的各交换机的网络拓扑结构、所述各交换机之间的链路带宽和占用情况、各交换机之间链路性能、各交换机与所述控制器之间控制通道的带宽和占用情况以及各交换机与所述控制器之间控制通道的性能按照预设的选取规则从与所述第一交换机相邻连接的交换机中选取第二交换机。
上述方案中，所述发送单元，配置为通过第二控制通道向所述第二交换机发送第一Packet_out消息，其中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道，所述第一Packet_out消息封装了所述临 时通道建立请求消息，且所述第一Packet_out消息用于指示所述第二交换机将所述临时通道建立请求消息转发至所述第一交换机。
上述方案中，所述接收单元，配置为通过第二控制通道接收由所述第二交换机发送的第一Packet_in消息，其中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道；所述第一Packet_in消息中封装了所述第二交换机从所述第一交换机接收的所述临时通道建立响应消息；以及，
将所述第一Packet_in消息进行解封装，获取得到所述临时通道建立响应消息。
上述方案中，所述临时通道包括：所述第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
上述方案中，所述检测单元还配置为：在所述交互单元通过所述临时通道与所述第一交换机进行通信交互的过程中，对所述第一控制通道进行检测；
所述控制器还包括切换单元，配置为当所述检测单元检测到所述第一控制通道恢复正常时，将所述交互单元与所述第一交换机进行通信交互的所述临时通道切换至所述第一控制通道。
第四方面，本发明实施例提供了一种第一交换机，所述第一交换机包括接收单元、判断单元、发送单元、检测单元和交互单元，其中，
所述接收单元，配置为接收由控制器通过第一控制通道发送的查询消息，其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道；
所述判断单元，配置为在所述接收单元接收到由控制器通过第一控制通道发送的查询消息之后，判断所述第一交换机自身是否具备建立临时通道的能力；
所述发送单元，配置为向所述控制器发送查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
所述检测单元，配置为检测所述第一控制通道是否发生故障，当检测到所述第一控制通道发生故障时，触发所述接收单元；
所述接收单元，还配置为当所述检测单元检测到所述第一控制通道发生故障时，接收所述控制器通过第二交换机转发的临时通道建立请求消息；其中，所述第二交换机由所述控制器根据预设的临时通道建立策略选取，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
所述发送单元，还配置为通过所述第二交换机转发临时通道建立响应消息至所述控制器；
所述交互单元，配置为通过所述临时通道与所述控制器进行通信交互。
上述方案中，所述判断单元，配置为当所述第一交换机具备OpenFlow交换机规范定义的LOCAL端口，且所述第一交换机已配置了将所述控制器发送的OpenFlow协议消息从所述LOCAL端口输出的流表，且所述第一交换机具备将所述LOCAL端口输出的所述OpenFlow协议消息传输至本地OpenFlow协议栈进行处理的能力时，确定所述第一交换机具备建立临时通道的能力。
上述方案中，所述接收单元，配置为接收由所述第二交换机根据第一Packet_out消息指示的端口发送的所述临时通道建立请求消息；其中，所述第一Packet_out消息封装了所述临时通道建立请求消息；所述临时通道建立请求消息由所述第二交换机通过第二控制通道从所述控制器接收所述第一Packet_out消息之后，对所述第一Packet_out消息进行解封装获取得到；所述第二控制通道为所述控制器与所述第二交换机之间的控制通道。
上述方案中，所述临时通道包括：所述第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
第五方面，本发明实施例提供了一种临时通道的建立系统，所述系统 包括：控制器、第一交换机和第二交换机，其中，
所述控制器，配置为：
通过查询消息确定第一交换机具备建立临时通道能力之后，当所述控制器检测到第一控制通道发生故障时，所述控制器根据预设的临时通道建立策略选取第二交换机，其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道，所述第二交换机与所述第一交换机相邻连接；
以及，通过所述第二交换机转发临时通道建立请求消息至所述第一交换机；其中，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
以及，接收到由所述第二交换机转发的临时通道建立响应消息后，通过所述临时通道与所述第一交换机进行通信交互，其中，所述临时通道建立响应消息由所述第一交换机发送给所述第二交换机；
所述第一交换机，配置为：
在接收到由所述控制器通过所述第一控制通道发送的查询消息之后，判断自身是否具备建立临时通道的能力；
以及，向所述控制器发送所述查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
以及，当所述第一交换机具备建立临时通道能力，且所述第一交换机检测到自身与所述控制器之间的控制通道发生故障时，接收所述控制器通过所述第二交换机转发的临时通道建立请求消息；
以及，通过所述第二交换机转发临时通道建立响应消息至所述控制器，并通过所述临时通道与所述控制器进行通信交互。
第六方面，本发明实施例还提供了一种计算机存储介质，所述存储介质包括一组计算机可执行指令，所述指令用于执行本发明实施例所述控制器侧的临时通道的建立方法。
第七方面，本发明实施例还提供了一种计算机存储介质，所述存储介质包括一组计算机可执行指令，所述指令用于执行本发明实施例所述第一交换机侧的临时通道的建立方法。
本发明实施例提供了一种临时通道的建立方法、设备、系统和计算机存储介质，控制器通过选取通道故障交换机相邻的最优交换机，建立控制器与通道故障交换机之间的临时通道，从而无需为每个交换机都设置一个冗余的控制器作为备份，因此，可以减少网络部署的成本。
附图说明
图1为本发明实施例提供的一种OpenFlow网络组件架构示意图；
图2为本发明实施例提供的一种临时通道的建立方法流程示意图；
图3为本发明实施例提供的控制器通过查询消息确定第一交换机具备建立临时通道能力的流程示意图；
图4为本发明实施例提供的另一种临时通道的建立方法流程示意图；
图5为本发明实施例提供的一种详细的临时通道的建立方法流程示意图；
图6为本发明实施例提供的一种控制器的结构示意图；
图7为本发明实施例提供的另一种控制器的结构示意图；
图8为本发明实施例提供的一种第一交换机的结构示意图；
图9为本发明实施里提供的一种临时通道的建立系统的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。
为了能够清楚地对本发明实施例的技术方案进行描述，参见图1，其示出了本发明实施例提供的一种OpenFlow网络组件架构，本领域技术人员可 以理解的，本发明技术方案可以无需创造性劳动地应用在其他类似的场景中，后续不再赘述。在如图1所示的场景中，OpenFlow控制器对OpenFlow交换机1、OpenFlow交换机2、OpenFlow交换机3和OpenFlow交换机4进行控制，各自的控制通道由空心粗箭头所示，而各控制通道既可以是带外OpenFlow通道，也可以是带内OpenFlow通道；而OpenFlow交换机1、OpenFlow交换机2、OpenFlow交换机3和OpenFlow交换机4两两之间分别有数据转发链路，由图中细实箭头所示。在本发明实施例中，仅以OpenFlow交换机3作为第一交换机为例进行说明。
参见图2，其示出了本发明实施例提供的一种临时通道的建立方法流程，该方法可以应用于控制器中，该方法可以包括：
S201：控制器通过查询消息确定第一交换机具备建立临时通道能力之后，当控制器检测到第一控制通道发生故障时，控制器根据预设的临时通道建立策略选取第二交换机；
示例性地，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道，可以是带内OpenFlow通道或者带外OpenFlow通道；所述第二交换机与所述第一交换机相邻连接；
示例性地，参见图3，控制器通过查询消息确定第一交换机具备建立临时通道能力，可以包括S301至S303：
S301：控制器通过第一控制通道向所述第一交换机发送查询消息；
所述查询消息用于查询所述第一交换机是否具备建立临时通道能力；需要说明的是，由于查询消息是控制器了解各交换机是否具备建立临时通道能力的起始事件，因此，控制器可以在网络架构时，当控制器与交换机之间的控制通道建立成功之后，立即向交换机发送查询消息，用来查询交换机是否支持建立临时通道。
S302：控制器接收所述第一交换机通过所述第一控制通道返回的查询响应消息；
所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
S303：当所述查询响应消息指示所述第一交换机具备建立临时通道能力时，所述控制器确定所述第一交换机具备建立临时通道能力。
例如，在本实施例中，OpenFlow控制器通过第一控制通道向OpenFlow交换机3发送查询消息，并通过第一控制通道接收OpenFlow交换机3返回的查询响应消息，以及根据查询响应消息确定OpenFlow交换机3具备建立了临时通道能力。
示例性地，控制器根据预设的临时通道建立策略选取第二交换机，可以包括：
所述控制器根据与自身相连的各交换机的网络拓扑结构、所述各交换机之间的链路带宽和占用情况、各交换机之间链路性能、各交换机与所述控制器之间控制通道的带宽和占用情况以及各交换机与所述控制器之间控制通道的性能，按照预设的选取规则从与所述第一交换机相邻连接的交换机中选取第二交换机；
例如，在本实施例中，OpenFlow控制器可以根据当前网络环境下的各交换机的网络拓扑结构、所述各交换机之间的链路带宽和占用情况、各交换机之间链路性能、各交换机与OpenFlow控制器之间控制通道的带宽和占用情况以及各交换机与OpenFlow控制器之间控制通道的性能，从与OpenFlow交换机3相邻连接的OpenFlow交换机1、OpenFlow交换机2、OpenFlow交换机4中进行最优选择，从而选取OpenFlow交换机2作为第二交换机。
S202：控制器通过所述第二交换机转发临时通道建立请求消息至所述第一交换机；
示例性地，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控 制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
控制器通过所述第二交换机转发临时通道建立请求消息至所述第一交换机，包括：
所述控制器通过第二控制通道向所述第二交换机发送第一Packet_out(简称P_o)消息，其中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道，所述第一Packet_out消息封装了所述临时通道建立请求消息，且所述第一Packet_out消息用于指示所述第二交换机将所述临时通道建立请求消息转发至所述第一交换机；所述临时通道可以包括：所述第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路；
在本实施例中，OpenFlow控制器通过与OpenFlow交换机2之间的控制通道向OpenFlow交换机2发送封装了所述临时通道建立请求消息的第一Packet_out消息，且所述第一Packet_out消息用于指示OpenFlow交换机2将所述临时通道建立请求消息通过OpenFlow交换机2与OpenFlow交换机3之间的数据转发链路转发至OpenFlow交换机3；所述临时通道建立请求消息用于向OpenFlow交换机3请求建立OpenFlow控制器与OpenFlow交换机3之间的临时通道。由此可以看出，OpenFlow控制器与OpenFlow交换机3之间临时通道可以包括：OpenFlow控制器与OpenFlow交换机2之间控制通道以及OpenFlow交换机2与OpenFlow交换机3之间的数据转发链路，由此可以得知，OpenFlow控制器与OpenFlow交换机3之间临时通道也就是一条OpenFlow控制器与OpenFlow交换机3之间的带内OpenFlow通道。
S203：控制器接收到由所述第二交换机转发的临时通道建立响应消息后，通过所述临时通道与所述第一交换机进行通信交互；
示例性地，所述控制器接收到由所述第二交换机转发的临时通道建立响应消息，包括：
所述控制器通过第二控制通道接收由所述第二交换机发送的第一 Packet_in(简称P_i)消息；以及，
所述控制器将所述第一Packet_in消息进行解封装，获取得到所述临时通道建立响应消息。
其中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道；所述第一Packet_in消息中封装了所述第二交换机从所述第一交换机接收的所述临时通道建立响应消息。
示例性地，所述临时通道建立响应消息由所述第一交换机发送给所述第二交换机，在本实施例中，所述临时通道建立响应消息就是OpenFlow交换机3通过OpenFlow交换机2与OpenFlow交换机3之间的数据转发链路发送至OpenFlow交换机2；OpenFlow交换机2在接收到所述临时通道建立响应消息之后，将所述临时通道建立响应消息封装于第一Packet_in消息中，并将第一Packet_in消息通过第二控制通道传输至控制器。
示例性地，除了上述S201至S203以外，该方法还可以包括：
在所述控制器通过所述临时通道与所述第一交换机进行通信交互的过程中，当所述控制器检测到所述第一控制通道恢复正常时，所述控制器将自身与所述第一交换机进行通信交互的所述临时通道切换至所述第一控制通道。
本发明实施例提供了一种临时通道的建立方法，控制器通过选取通道故障交换机相邻的最优交换机，建立控制器与通道故障交换机之间的临时通道，从而无需为每个交换机都设置一个冗余的控制器作为备份，因此，可以减少网络部署的成本。
基于图2所示实施例相同的技术构思，参见图4，其示出了本发明实施例提供的另一种临时通道的建立方法流程，该方法可以应用于第一交换机中，该方法可以包括：
S401：第一交换机在接收到由控制器通过第一控制通道发送的查询消息之后，判断自身是否具备建立临时通道的能力；
示例性地，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道；
需要说明的是，由于查询消息是控制器了解各交换机是否具备建立临时通道能力的起始事件，因此，在网络架构时，当控制器与交换机之间的控制通道建立成功之后，交换机会马上接收到控制器发送的查询消息，用来查询交换机是否支持建立临时通道。
示例性地，所述第一交换机判断自身是否具备建立临时通道的能力，包括：
当所述第一交换机具备OpenFlow交换机规范定义的LOCAL端口，且所述第一交换机已配置了将所述控制器发送的OpenFlow协议消息从所述LOCAL端口输出的流表，且所述第一交换机具备将所述LOCAL端口输出的所述OpenFlow协议消息传输至本地OpenFlow协议栈进行处理的能力时，所述第一交换机确定自身具备建立临时通道的能力。
S402：第一交换机向控制器发送查询响应消息；
示例性地，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
S403：当第一交换机具备建立临时通道能力，且第一交换机检测到第一控制通道发生故障时，第一交换机接收控制器通过第二交换机转发的临时通道建立请求消息；
示例性地，所述第二交换机由所述控制器根据预设的临时通道建立策略选取，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
示例性地，所述第一交换机接收所述控制器通过所述第二交换机转发的临时通道建立请求消息，包括：
所述第一交换机接收由所述第二交换机根据第一Packet_out消息指示 的端口发送的所述临时通道建立请求消息；其中，所述第一Packet_out消息封装了所述临时通道建立请求消息；所述临时通道建立请求消息由所述第二交换机通过第二控制通道从所述控制器接收所述第一Packet_out消息之后，对所述第一Packet_out消息进行解封装获取得到；所述第二控制通道为所述控制器与所述第二交换机之间的控制通道。所述临时通道包括：所述第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
S404：第一交换机通过第二交换机转发临时通道建立响应消息至控制器，并通过所述临时通道与控制器进行通信交互。
本发明实施例提供了一种临时通道的建立方法，控制器通过选取通道故障交换机相邻的最优交换机，建立控制器与通道故障交换机之间的临时通道，从而无需为每个交换机都设置一个冗余的控制器作为备份，因此，可以减少网络部署的成本。
在图2至图4所述的技术方案的基础上，结合图1所示的应用场景，参见图5，其示出了本发明实施例提供的一种详细的临时通道的建立方法流程；在本实施例中，特别以OpenFlow交换机3为第一交换机为例进行说明，可以理解的，也可以将本实施例应用于OpenFlow交换机1、OpenFlow交换机2和OpenFlow交换机4上，本发明实施例对此不作任何限定。该方法可以包括：
S501：OpenFlow控制器通过自身与OpenFlow交换机3之间的第一控制通道向OpenFlow交换机3发送查询消息；
需要说明的是，OpenFlow控制器与OpenFlow交换机3之间的第一控制通道可以是带内OpenFlow通道也可以是带外OpenFlow通道，本实施例对此不作具体限定。
示例性地，查询消息用于查询OpenFlow交换机3是否具备建立临时通道能力；需要说明的是，由于查询消息是OpenFlow控制器了解各OpenFlow 交换机是否具备建立临时通道能力的起始事件，因此，OpenFlow控制器可以在网络架构时，当OpenFlow控制器与OpenFlow交换机3之间的控制通道建立成功之后，立即向OpenFlow交换机3发送查询消息，用来查询OpenFlow交换机3是否支持建立临时通道。可以理解的，OpenFlow控制器也可以向OpenFlow交换机1、OpenFlow交换机2和OpenFlow交换机4通过各自的控制通道发送查询消息，以使得OpenFlow控制器了解各OpenFlow交换机是否具备建立临时通道能力。
S502：OpenFlow交换机3在接收到由OpenFlow控制器通过第一控制通道发送的查询消息之后，判断自身是否具备建立临时通道的能力；
示例性地，在本实施例中，OpenFlow交换机3判断自身是否具备建立临时通道的能力，包括：
当OpenFlow交换机3具备OpenFlow交换机规范定义的LOCAL端口，且OpenFlow交换机3已配置了将OpenFlow控制器发送的OpenFlow协议消息从所述LOCAL端口输出的流表，且OpenFlow交换机3具备将所述LOCAL端口输出的所述OpenFlow协议消息传输至本地OpenFlow协议栈进行处理的能力时，OpenFlow交换机3确定自身具备建立临时通道的能力；否则，OpenFlow交换机3确定自身不具备建立临时通道的能力。
与OpenFlow交换机3相类似的，OpenFlow交换机1、OpenFlow交换机2和OpenFlow交换机4也可以根据上述方式确定自身是否具备建立临时通道的能力。
S503：OpenFlow交换机3通过第一控制通道向OpenFlow控制器发送查询响应消息；
示例性地，所述查询响应消息用于指示OpenFlow交换机3是否具备建立临时通道能力；
可以理解的，只有OpenFlow交换机具备建立临时通道能力，OpenFlow控制器才可以在OpenFlow交换机与OpenFlow控制器之间的控制通道发生 故障时，与OpenFlow交换机之间建立临时通道；而OpenFlow交换机不具备建立临时通道能力的话，当OpenFlow交换机与OpenFlow控制器之间的控制通道发生故障时，OpenFlow控制器不会与OpenFlow交换机之间建立临时通道。
在本实施例中，设定OpenFlow交换机3具备建立临时通道能力，因此，本实施例还继续包括以下步骤：
S504：OpenFlow控制器通过查询消息确定OpenFlow交换机3具备建立临时通道能力之后，当OpenFlow控制器检测到与OpenFlow交换机3之间的控制通道发生故障时，OpenFlow控制器根据预设的临时通道建立策略选取第二交换机；
需要说明的是，根据OpenFlow协议规定：OpenFlow控制器与OpenFlow交换机之间可以通过周期性互发Echo消息的方式来对OpenFlow控制通道进行监测。
示例性地，OpenFlow控制器根据预设的临时通道建立策略选取第二交换机，可以包括：OpenFlow控制器根据与自身相连的各OpenFlow交换机的网络拓扑结构、所述各OpenFlow交换机之间的链路带宽和占用情况、各OpenFlow交换机之间链路性能、各OpenFlow交换机与OpenFlow控制器之间控制通道的带宽和占用情况以及各OpenFlow交换机与OpenFlow控制器之间控制通道的性能按照预设的选取规则，比如剩余链路带宽最大、链路占用最小、链路性能最优、控制通道性能最优等规则，从与OpenFlow交换机3相邻连接的OpenFlow交换机中选取第二交换机；在本实施例中，第二交换机可以为OpenFlow交换机2。
S505：OpenFlow控制器将封装了临时通道建立请求消息的第一Packet_out消息通过第二控制通道发送至OpenFlow交换机2；
Packet_out消息是一种OpenFlow协议消息，由OpenFlow控制器向OpenFlow交换机发送；在Packet_out消息中封装了OpenFlow控制器要求 OpenFlow交换机处理的报文并指定了OpenFlow交换机对所封装报文的处理方式。在本实施例中，第一Packet_out消息中可以指示OpenFlow交换机2把第一Packet_out消息中封装的临时通道建立请求消息从与OpenFlow交换机3相连的端口输出，以使得OpenFlow交换机2转发其中所封装的临时通道建立请求消息至OpenFlow交换机3。
在本实施例中，第二控制通道既可以是带内OpenFlow通道，也可以是带外OpenFlow通道，本实施例对此不作具体限定。
S506：OpenFlow交换机2将临时通道建立请求消息发送至OpenFlow交换机3；
示例性地，由于OpenFlow交换机2与OpenFlow交换机3之前通过数据转发链路连接，因此，OpenFlow交换机2会根据从OpenFlow控制器接收的第一Packet_out消息的指示通过数据转发链路将第一Packet_out消息中的临时通道建立请求消息发送至OpenFlow交换机3。
S507：OpenFlow交换机3将临时通道建立响应消息发送至OpenFlow交换机2；
示例性地，OpenFlow交换机3也能够对第一控制通道进行检测，当检测到第一控制通道出现故障的时候，OpenFlow交换机3将会等待由OpenFlow控制器发送过来的临时通道建立请求消息；因此，OpenFlow交换机3在从OpenFlow交换机2接收到临时通道建立请求消息之后，生成临时通道建立响应消息，并将临时通道建立响应消息发送至OpenFlow交换机2。
示例性地，由于OpenFlow交换机3从OpenFlow交换机2接收到临时通道建立请求消息，说明OpenFlow控制器已经将OpenFlow交换机2选定为临时通道的中转节点。
在本实施例中，OpenFlow交换机3中预先保存了匹配字段为“源IP地址＝控制器IP”的流表，因此，当OpenFlow交换机3接收到源IP地址为 OpenFlow控制器IP地址的临时通道建立请求消息之后，会匹配该流表成功并执行相应的流表指令，本实施例中执行的流表指令为“执行动作{从LOCAL端口输出}”，即匹配流表成功的临时通道建立请求消息会被从LOCAL端口输出到OpenFlow交换机3的本地网络协议栈进行处理。由于OpenFlow协议是基于TCP连接运行的，所以临时通道建立请求消息就是TCP连接建立请求消息，而具备建立临时通道能力的OpenFlow交换机3的本地网络协议栈肯定支持TCP协议，于是从LOCAL端口接收到OpenFlow交换机2转发的临时通道建立请求消息后，向OpenFlow交换机2回复以OpenFlow控制器IP地址为目的IP地址的临时通道建立响应消息，也就是TCP连接建立响应消息。
S508：OpenFlow交换机2将临时通道建立响应消息封装在第一Packet_in消息中，并通过第二控制通道将第一Packet_in消息发送至OpenFlow控制器；
Packet_in消息是一种OpenFlow协议消息，由OpenFlow交换机向OpenFlow控制器发送；Packet_in消息中封装了OpenFlow交换机希望OpenFlow控制器处理的报文，OpenFlow交换机接收到的报文无法成功匹配流表时缺省应封装在Packet_in消息中发往OpenFlow控制器进行处理。示例性地，OpenFlow交换机2接收到从OpenFlow交换机3发送过来的临时通道建立响应消息后，由于OpenFlow交换机2上已配置的流表无法对临时通道建立响应消息匹配成功，所以OpenFlow交换机2会把临时通道建立响应消息封装到第一Packet_in消息中发往OpenFlow控制器，从而，OpenFlow控制器把第一Packet_in消息解封装后即得到了始发自OpenFlow交换机3的临时通道建立响应消息。
经过上述过程，OpenFlow控制器与OpenFlow交换机3就建立起了以OpenFlow交换机2为中转节点的临时通道，从而达到恢复OpenFlow控制器与OpenFlow交换机3之间发生故障的第一控制通道的目的。
在临时通道建立后，OpenFlow控制器与OpenFlow交换机3之间就可以通过这个临时通道进行OpenFlow协议消息的交互。可以理解的，临时通道可以由第二控制通道以及OpenFlow交换机2与OpenFlow交换机3之间的数据转发链路组成。
还需要说明的是，由于临时通道是建立在已有的控制通道的基础之上的，因此，临时通道不可避免的会具有开销和延迟较大的缺陷，所以，在所述控制器通过所述临时通道与所述第一交换机进行通信交互的过程中，当OpenFlow控制器检测到第一控制通道恢复正常时，OpenFlow控制器会将自身与OpenFlow交换机3进行通信交互的临时通道切换至所述第一控制通道，并且关闭该临时通道。
从上述OpenFlow控制器与OpenFlow交换机3之间建立临时通道的流程可以看出，这种临时通道的建立无需像现有技术一样预先建立备用OpenFlow通道，而是由OpenFlow控制器通过预先查询获知网络中哪些OpenFlow交换机支持建立临时通道，然后在OpenFlow控制器检测到其与支持建立临时通道的交换机之间的控制通道发生故障后，根据其掌握的实时网络状况从多条可用的最短路径中选择一条最优路径来建立临时通道，具有简单易部署且灵活性很高的优点。
本发明实施例提供了一种临时通道的建立方法，控制器通过选取通道故障交换机相邻的最优交换机，建立控制器与通道故障交换机之间的临时通道，从而无需为每个交换机都设置一个冗余的控制器作为备份，因此，可以减少网络部署的成本。
基于与上述实施例相同的技术构思，参见图6，其示出了本发明实施例提供的一种控制器60，该控制器60可以包括：确定单元601、检测单元602、选取单元603、发送单元604、接收单元605和交互单元606，其中，
所述确定单元601，配置为通过查询消息确定第一交换机具备建立临时通道能力；
所述检测单元602，配置为检测第一控制通道发生故障，且当检测到所述第一控制通道发生故障时，触发选取单元603；其中，所述第一控制通道为所述控制器60与所述第一交换机之间的控制通道；
所述选取单元603，配置为当所述检测单元602检测到所述第一控制通道发生故障时，根据预设的临时通道建立策略选取第二交换机，其中，所述第二交换机与所述第一交换机相邻连接；
所述发送单元604，配置为通过所述第二交换机转发临时通道建立请求消息至所述第一交换机；其中，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器60与所述第一交换机之间的临时通道，所述临时通道为所述控制器60与所述第一交换机之间且以所述第二交换机为中转节点的通道；
所述接收单元605，配置为接收由所述第二交换机转发的临时通道建立响应消息，其中，所述临时通道建立响应消息由所述第一交换机发送给所述第二交换机；
所述交互单元606，配置为在所述接收单元605接收到所述临时通道建立响应消息之后，通过所述临时通道与所述第一交换机进行通信交互。
示例性地，所述确定单元601配置为：
通过所述第一控制通道向所述第一交换机发送查询消息，其中，所述查询消息用于查询所述第一交换机是否具备建立临时通道能力；以及，
接收所述第一交换机通过所述第一控制通道返回的查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；以及，
当所述查询响应消息指示所述第一交换机具备建立临时通道能力时，确定所述第一交换机具备建立临时通道能力。
示例性地，所述选取单元603配置为：根据与所述控制器60相连的各交换机的网络拓扑结构、所述各交换机之间的链路带宽和占用情况、各交 换机之间链路性能、各交换机与所述控制器60之间控制通道的带宽和占用情况以及各交换机与所述控制器60之间控制通道的性能，按照预设的选取规则从与所述第一交换机相邻连接的交换机中选取第二交换机。
示例性地，所述发送单元604配置为：通过第二控制通道向所述第二交换机发送第一Packet_out消息，其中，所述第二控制通道为所述控制器60与所述第二交换机之间的控制通道，所述第一Packet_out消息封装了所述临时通道建立请求消息，且所述第一Packet_out消息用于指示所述第二交换机将所述临时通道建立请求消息转发至所述第一交换机。所述临时通道包括：所述第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
示例性地，所述接收单元605配置为：通过第二控制通道接收由所述第二交换机发送的第一Packet_in消息，其中，所述第二控制通道为所述控制器60与所述第二交换机之间的控制通道；所述第一Packet_in消息中封装了所述第二交换机从所述第一交换机接收的所述临时通道建立响应消息；以及，
将所述第一Packet_in消息进行解封装，获取得到所述临时通道建立响应消息。
示例性地，所述检测单元602还配置为：在所述交互单元606通过所述临时通道与所述第一交换机进行通信交互的过程中，对所述第一控制通道进行检测；
另外，参见图7，所述控制器60还包括切换单元607，配置为当所述检测单元602检测到所述第一控制通道恢复正常时，将所述交互单元与所述第一交换机进行通信交互的所述临时通道切换至所述第一控制通道。
本发明实施例提供了一种控制器60，控制器60通过选取通道故障交换机相邻的最优交换机，建立控制器60与通道故障交换机之间的临时通道，从而无需为每个交换机都设置一个冗余的控制器作为备份，因此，可以减 少网络部署的成本。
参见图8，其示出了本发明实施例提供的一种第一交换机80，可以包括：接收单元801、判断单元802、发送单元803、检测单元804和交互单元805，其中，
所述接收单元801，配置为接收由控制器通过第一控制通道发送的查询消息，其中，所述第一控制通道为所述控制器与所述第一交换机80之间的控制通道；
所述判断单元802，配置为在所述接收单元801接收到由控制器通过第一控制通道发送的查询消息之后，判断所述第一交换机80自身是否具备建立临时通道的能力；
所述发送单元803，配置为向所述控制器发送查询响应消息，所述查询响应消息用于指示所述第一交换机80是否具备建立临时通道能力；
所述检测单元804，配置为检测所述第一控制通道是否发生故障，当检测到所述第一控制通道发生故障时，触发所述接收单元801；
所述接收单元801，还配置为当所述检测单元804检测到所述第一控制通道发生故障时，接收所述控制器通过第二交换机转发的临时通道建立请求消息；其中，所述第二交换机由所述控制器根据预设的临时通道建立策略选取，所述临时通道建立请求消息用于向所述第一交换机80请求建立所述控制器与所述第一交换机80之间的临时通道，所述临时通道为所述控制器与所述第一交换机80之间且以所述第二交换机为中转节点的通道；
所述发送单元803，还配置为通过所述第二交换机转发临时通道建立响应消息至所述控制器；
所述交互单元805，配置为通过所述临时通道与所述控制器进行通信交互。
示例性地，所述判断单元802配置为：当所述第一交换机80具备OpenFlow交换机规范定义的LOCAL端口，且所述第一交换机80已配置了 将所述控制器发送的OpenFlow协议消息从所述LOCAL端口输出的流表，且所述第一交换机80具备将所述LOCAL端口输出的所述OpenFlow协议消息传输至本地OpenFlow协议栈进行处理的能力时，确定所述第一交换机80具备建立临时通道的能力。
示例性地，所述接收单元801配置为：接收由所述第二交换机根据第一Packet_out消息指示的端口发送的所述临时通道建立请求消息；其中，所述第一Packet_out消息封装了所述临时通道建立请求消息；所述临时通道建立请求消息由所述第二交换机通过第二控制通道从所述控制器接收所述第一Packet_out消息之后，对所述第一Packet_out消息进行解封装获取得到；所述第二控制通道为所述控制器与所述第二交换机之间的控制通道。所述临时通道包括：所述第二控制通道以及所述第二交换机与所述第一交换机80之间的数据转发链路。
本发明实施例提供了一种第一交换机80，控制器通过选取第一交换机80相邻的最优交换机，建立控制器与第一交换机80之间的临时通道，从而无需为每个交换机都设置一个冗余的控制器作为备份，因此，可以减少网络部署的成本。
参见图9，其示出了本发明实施里提供的一种临时通道的建立系统90，所述系统90可以包括：控制器60、第一交换机80和第二交换机100，其中，
所述控制器60，配置为：
通过查询消息确定第一交换机80具备建立临时通道能力之后，当所述控制器60检测到第一控制通道发生故障时，所述控制器60根据预设的临时通道建立策略选取第二交换机100，其中，所述第一控制通道为所述控制器60与所述第一交换机80之间的控制通道，所述第二交换机100与所述第一交换机80相邻连接；
以及，通过所述第二交换机100转发临时通道建立请求消息至第一交 换机80；其中，所述临时通道建立请求消息用于向所述第一交换机80请求建立所述控制器60与所述第一交换机80之间的临时通道，所述临时通道为所述控制器60与所述第一交换机80之间且以所述第二交换机100为中转节点的通道；
以及，接收到由所述第二交换机100转发的临时通道建立响应消息后，通过所述临时通道与所述第一交换机80进行通信交互，其中，所述临时通道建立响应消息由所述第一交换机80发送给所述第二交换机100；
所述第一交换机80，配置为：
在接收到由所述控制器60通过所述第一控制通道发送的查询消息之后，判断自身是否具备建立临时通道的能力；
以及，向所述控制器60发送所述查询响应消息，所述查询响应消息用于指示所述第一交换机80是否具备建立临时通道能力；
以及，当所述第一交换机80具备建立临时通道能力，且所述第一交换机80检测到自身与所述控制器60之间的控制通道发生故障时，接收所述控制器60通过所述第二交换机100转发的临时通道建立请求消息；
以及，通过所述第二交换机100转发临时通道建立响应消息至所述控制器60，并通过所述临时通道与所述控制器60进行通信交互。
本发明实施例提供了一种临时通道的建立系统90，控制器60通过选取第一交换机80相邻的最优第二交换机100，建立控制器60与第一交换机80之间的临时通道，从而无需为每个交换机都设置一个冗余的控制器作为备份，因此，可以减少网络部署的成本。
本发明实施例还提供了一种计算机存储介质，所述存储介质包括一组计算机可执行指令，所述指令用于执行本发明实施例所述控制器侧的临时通道的建立方法。
本发明实施例还提供了一种计算机存储介质，所述存储介质包括一组计算机可执行指令，所述指令用于执行本发明实施例所述第一交换机侧的 临时通道的建立方法。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。

Claims (25)

  1. 一种临时通道的建立方法，所述方法包括：
    控制器通过查询消息确定第一交换机具备建立临时通道能力之后，当所述控制器检测到第一控制通道发生故障时，所述控制器根据预设的临时通道建立策略选取第二交换机，其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道，所述第二交换机与所述第一交换机相邻连接；
    所述控制器通过所述第二交换机转发临时通道建立请求消息至所述第一交换机；其中，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
    所述控制器接收到由所述第二交换机转发的临时通道建立响应消息后，通过所述临时通道与所述第一交换机进行通信交互，其中，所述临时通道建立响应消息由所述第一交换机发送给所述第二交换机。
  2. 根据权利要求1所述的方法，其中，所述控制器通过查询消息确定第一交换机具备建立临时通道能力，包括：
    所述控制器通过所述第一控制通道向所述第一交换机发送查询消息，其中，所述查询消息用于查询所述第一交换机是否具备建立临时通道能力；
    所述控制器接收所述第一交换机通过所述第一控制通道返回的查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
    当所述查询响应消息指示所述第一交换机具备建立临时通道能力时，所述控制器确定所述第一交换机具备建立临时通道能力。
  3. 根据权利要求1所述的方法，其中，所述控制器根据预设的临时通道建立策略选取第二交换机，包括：
    所述控制器根据与自身相连的各交换机的网络拓扑结构、所述各交换机之间的链路带宽和占用情况、各交换机之间链路性能、各交换机与所述控制器之间控制通道的带宽和占用情况以及各交换机与所述控制器之间控制通道的性能，按照预设的选取规则从与所述第一交换机相邻连接的交换机中选取第二交换机。
  4. 根据权利要求1所述的方法，其中，所述控制器通过所述第二交换机转发临时通道建立请求消息至所述第一交换机，包括：
    所述控制器通过第二控制通道向所述第二交换机发送第一Packet_out消息，其中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道，所述第一Packet_out消息封装了所述临时通道建立请求消息，且所述第一Packet_out消息用于指示所述第二交换机将所述临时通道建立请求消息转发至所述第一交换机。
  5. 根据权利要求1所述的方法，其中，所述控制器接收到由所述第二交换机转发的临时通道建立响应消息，包括：
    所述控制器通过第二控制通道接收由所述第二交换机发送的第一Packet_in消息，其中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道；所述第一Packet_in消息中封装了所述第二交换机从所述第一交换机接收的所述临时通道建立响应消息；
    所述控制器将所述第一Packet_in消息进行解封装，获取得到所述临时通道建立响应消息。
  6. 根据权利要求4或5所述的方法，其中，所述临时通道包括：第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
  7. 根据权利要求1所述的方法，其中，所述方法还包括：
    在所述控制器通过所述临时通道与所述第一交换机进行通信交互的 过程中，当所述控制器检测到所述第一控制通道恢复正常时，所述控制器将自身与所述第一交换机进行通信交互的所述临时通道切换至所述第一控制通道。
  8. 一种临时通道的建立方法，所述方法包括：
    第一交换机在接收到由控制器通过第一控制通道发送的查询消息之后，判断自身是否具备建立临时通道的能力；其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道；
    所述第一交换机向所述控制器发送查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
    当所述第一交换机具备建立临时通道能力，且所述第一交换机检测到所述第一控制通道发生故障时，所述第一交换机接收所述控制器通过第二交换机转发的临时通道建立请求消息；其中，所述第二交换机由所述控制器根据预设的临时通道建立策略选取，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
    所述第一交换机通过所述第二交换机转发临时通道建立响应消息至所述控制器，并通过所述临时通道与所述控制器进行通信交互。
  9. 根据权利要求8所述的方法，其中，所述第一交换机判断自身是否具备建立临时通道的能力，包括：
    当所述第一交换机具备OpenFlow交换机规范定义的LOCAL端口，且所述第一交换机已配置了将所述控制器发送的OpenFlow协议消息从所述LOCAL端口输出的流表，且所述第一交换机具备将所述LOCAL端口输出的所述OpenFlow协议消息传输至本地OpenFlow协议栈进行处理的能力时，所述第一交换机确定自身具备建立临时通道的能力。
  10. 根据权利要求8所述的方法，其中，所述第一交换机接收所述 控制器通过所述第二交换机转发的临时通道建立请求消息，包括：
    所述第一交换机接收由所述第二交换机根据第一Packet_out消息指示的端口发送的所述临时通道建立请求消息；其中，所述第一Packet_out消息封装了所述临时通道建立请求消息；所述临时通道建立请求消息由所述第二交换机通过第二控制通道从所述控制器接收所述第一Packet_out消息之后，对所述第一Packet_out消息进行解封装获取得到；所述第二控制通道为所述控制器与所述第二交换机之间的控制通道。
  11. 根据权利要求10所述的方法，其中，所述临时通道包括：所述第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
  12. 一种控制器，所述控制器包括：确定单元、检测单元、选取单元、发送单元、接收单元和交互单元，其中，
    所述确定单元，配置为通过查询消息确定第一交换机具备建立临时通道能力；
    所述检测单元，配置为检测第一控制通道发生故障，且当检测到所述第一控制通道发生故障时，触发所述选取单元；其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道；
    所述选取单元，配置为当所述检测单元检测到所述第一控制通道发生故障时，根据预设的临时通道建立策略选取第二交换机，其中，所述第二交换机与所述第一交换机相邻连接；
    所述发送单元，配置为通过所述第二交换机转发临时通道建立请求消息至所述第一交换机；其中，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
    所述接收单元，配置为接收由所述第二交换机转发的临时通道建立 响应消息，其中，所述临时通道建立响应消息由所述第一交换机发送给所述第二交换机；
    所述交互单元，配置为当所述接收单元接收到所述临时通道建立响应消息之后，通过所述临时通道与所述第一交换机进行通信交互。
  13. 根据权利要求12所述的控制器，其中，所述确定单元配置为：
    通过所述第一控制通道向所述第一交换机发送查询消息，其中，所述查询消息用于查询所述第一交换机是否具备建立临时通道能力；以及，
    接收所述第一交换机通过所述第一控制通道返回的查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；以及，
    当所述查询响应消息指示所述第一交换机具备建立临时通道能力时，所述控制器确定所述第一交换机具备建立临时通道能力。
  14. 根据权利要求12所述的控制器，其中，所述选取单元，配置为根据与所述控制器相连的各交换机的网络拓扑结构、所述各交换机之间的链路带宽和占用情况、各交换机之间链路性能、各交换机与所述控制器之间控制通道的带宽和占用情况以及各交换机与所述控制器之间控制通道的性能，按照预设的选取规则从与所述第一交换机相邻连接的交换机中选取第二交换机。
  15. 根据权利要求12所述的控制器，其中，所述发送单元，配置为通过第二控制通道向所述第二交换机发送第一Packet_out消息，其中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道，所述第一Packet_out消息封装了所述临时通道建立请求消息，且所述第一Packet_out消息用于指示所述第二交换机将所述临时通道建立请求消息转发至所述第一交换机。
  16. 根据权利要求12所述的控制器，其中，所述接收单元，配置为通过第二控制通道接收由所述第二交换机发送的第一Packet_in消息，其 中，所述第二控制通道为所述控制器与所述第二交换机之间的控制通道；所述第一Packet_in消息中封装了所述第二交换机从所述第一交换机接收的所述临时通道建立响应消息；以及，
    将所述第一Packet_in消息进行解封装，获取得到所述临时通道建立响应消息。
  17. 根据权利要求15或16所述的控制器，其中，所述临时通道包括：所述第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
  18. 根据权利要求12所述的控制器，其中，
    所述检测单元还配置为：在所述交互单元通过所述临时通道与所述第一交换机进行通信交互的过程中，对所述第一控制通道进行检测；
    所述控制器还包括切换单元，配置为当所述检测单元检测到所述第一控制通道恢复正常时，将所述交互单元与所述第一交换机进行通信交互的所述临时通道切换至所述第一控制通道。
  19. 一种第一交换机，所述第一交换机包括接收单元、判断单元、发送单元、检测单元和交互单元，其中，
    所述接收单元，配置为接收由控制器通过第一控制通道发送的查询消息，其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道；
    所述判断单元，配置为在所述接收单元接收到由控制器通过第一控制通道发送的查询消息之后，判断所述第一交换机自身是否具备建立临时通道的能力；
    所述发送单元，配置为向所述控制器发送查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
    所述检测单元，配置为检测所述第一控制通道是否发生故障，当检测到所述第一控制通道发生故障时，触发所述接收单元；
    所述接收单元，还配置为当所述检测单元检测到所述第一控制通道发生故障时，接收所述控制器通过第二交换机转发的临时通道建立请求消息；其中，所述第二交换机由所述控制器根据预设的临时通道建立策略选取，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
    所述发送单元，还配置为通过所述第二交换机转发临时通道建立响应消息至所述控制器；
    所述交互单元，配置为通过所述临时通道与所述控制器进行通信交互。
  20. 根据权利要求19所述的第一交换机，其中，所述判断单元配置为：当所述第一交换机具备OpenFlow交换机规范定义的LOCAL端口，且所述第一交换机已配置了将所述控制器发送的OpenFlow协议消息从所述LOCAL端口输出的流表，且所述第一交换机具备将所述LOCAL端口输出的所述OpenFlow协议消息传输至本地OpenFlow协议栈进行处理的能力时，确定所述第一交换机具备建立临时通道的能力。
  21. 根据权利要求19所述的第一交换机，其中，所述接收单元，配置为：接收由所述第二交换机根据第一Packet_out消息指示的端口发送的所述临时通道建立请求消息；其中，所述第一Packet_out消息封装了所述临时通道建立请求消息；所述临时通道建立请求消息由所述第二交换机通过第二控制通道从所述控制器接收所述第一Packet_out消息之后，对所述第一Packet_out消息进行解封装获取得到；所述第二控制通道为所述控制器与所述第二交换机之间的控制通道。
  22. 根据权利要求21所述的第一交换机，其中，所述临时通道包括：所述第二控制通道以及所述第二交换机与所述第一交换机之间的数据转发链路。
  23. 一种临时通道的建立系统，所述系统包括：控制器、第一交换机和第二交换机，其中，
    所述控制器，配置为：
    通过查询消息确定第一交换机具备建立临时通道能力之后，当所述控制器检测到第一控制通道发生故障时，所述控制器根据预设的临时通道建立策略选取第二交换机，其中，所述第一控制通道为所述控制器与所述第一交换机之间的控制通道，所述第二交换机与所述第一交换机相邻连接；
    以及，通过所述第二交换机转发临时通道建立请求消息至所述第一交换机；其中，所述临时通道建立请求消息用于向所述第一交换机请求建立所述控制器与所述第一交换机之间的临时通道，所述临时通道为所述控制器与所述第一交换机之间且以所述第二交换机为中转节点的通道；
    以及，接收到由所述第二交换机转发的临时通道建立响应消息后，通过所述临时通道与所述第一交换机进行通信交互，其中，所述临时通道建立响应消息由所述第一交换机发送给所述第二交换机；
    所述第一交换机，配置为：
    在接收到由所述控制器通过所述第一控制通道发送的查询消息之后，判断自身是否具备建立临时通道的能力；
    以及，向所述控制器发送所述查询响应消息，所述查询响应消息用于指示所述第一交换机是否具备建立临时通道能力；
    以及，当所述第一交换机具备建立临时通道能力，且所述第一交换机检测到自身与所述控制器之间的控制通道发生故障时，接收所述控制器通过所述第二交换机转发的临时通道建立请求消息；
    以及，通过所述第二交换机转发临时通道建立响应消息至所述控制器，并通过所述临时通道与所述控制器进行通信交互。
  24. 一种计算机存储介质，所述存储介质包括一组计算机可执行指 令，所述指令用于执行权利要求1-7任一项所述的临时通道的建立方法。
  25. 一种计算机存储介质，所述存储介质包括一组计算机可执行指令，所述指令用于执行权利要求8-11任一项所述的临时通道的建立方法。
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