WO2023273883A1 - SDN混合overlay网络中的路径诊断方法和系统 - Google Patents

SDN混合overlay网络中的路径诊断方法和系统 Download PDF

Info

Publication number
WO2023273883A1
WO2023273883A1 PCT/CN2022/098855 CN2022098855W WO2023273883A1 WO 2023273883 A1 WO2023273883 A1 WO 2023273883A1 CN 2022098855 W CN2022098855 W CN 2022098855W WO 2023273883 A1 WO2023273883 A1 WO 2023273883A1
Authority
WO
WIPO (PCT)
Prior art keywords
diagnostic
message
diagnosis
diagnostic message
overlay network
Prior art date
Application number
PCT/CN2022/098855
Other languages
English (en)
French (fr)
Inventor
许多
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2023273883A1 publication Critical patent/WO2023273883A1/zh

Links

Images

Classifications

    • 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
    • H04L41/0677—Localisation of faults
    • 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

Definitions

  • the present application relates to network communication technologies, for example, to a path diagnosis method and system in an SDN hybrid overlay network.
  • SDN Software Defined Networking
  • DC Data Center
  • WAN Wide Area Network
  • VXLAN Virtual Extensible Local Area Network
  • the basic principle of path diagnosis in SDN is: the controller triggers the service switch to send a diagnosis message, simulates the service flow, and encapsulates the Internet Protocol (IP) five elements similar to the normal service flow. Group information; the source switch forwards the diagnostic message according to the forwarding path of the service, and the switch that receives the diagnostic message in the path reports the received information to the controller, and the controller analyzes and calculates the received information after receiving the received information, combined with the physical link , showing the path diagnosis result; if the diagnosis message is not delivered to the expected end node, the controller will prompt the corresponding fault point.
  • IP Internet Protocol
  • the present application provides a path diagnosis method and system in an SDN hybrid overlay network, which can perform path diagnosis on various devices in the SDN hybrid overlay network using a unified diagnosis message, and realize fast path diagnosis in the SDN hybrid overlay network.
  • the embodiment of the present application provides a path diagnosis method in an SDN hybrid overlay network, which is applied to an SDN controller, including: sending a diagnostic message to multiple devices in the hybrid overlay network, the diagnostic message and the service message structure The same, and encapsulate the diagnostic flow characteristics, the diagnostic message is used to make the device that receives the diagnostic message forward the diagnostic message according to the diagnostic flow feature and send the diagnostic message to the SDN controller The message; determine the path diagnosis result of the hybrid overlay network according to the diagnosis message sent by the device that received the diagnosis message.
  • the embodiment of the present application provides a path diagnosis method in an SDN hybrid overlay network, which is applied to devices in the SDN hybrid overlay network, including: receiving a diagnostic message sent by an SDN controller, the diagnostic message and the service message structure The same, and encapsulate the diagnostic flow characteristics; forward the diagnostic message according to the diagnostic flow characteristics and send the diagnostic message to the SDN controller, so that the SDN controller receives the diagnostic message according to the The diagnosis message sent by the device determines the path diagnosis result of the hybrid overlay network.
  • An embodiment of the present application provides a path diagnosis device in an SDN hybrid overlay network, including: a sending module configured to send a diagnostic message to multiple devices in the hybrid overlay network, and the diagnostic message has the same structure as the service message , and encapsulate the diagnostic flow feature, the diagnostic message is used to make the device that receives the diagnostic message forward the diagnostic message according to the diagnostic flow feature and send the diagnostic message to the SDN controller; diagnosis A module configured to determine the path diagnosis result of the hybrid overlay network according to the diagnostic message sent by the device that received the diagnostic message.
  • An embodiment of the present application provides a path diagnosis device in an SDN hybrid overlay network, including: a receiving module configured to receive a diagnostic message sent by an SDN controller, the diagnostic message has the same structure as the service message, and encapsulates the diagnostic message Flow characteristics; a sending module, configured to forward the diagnostic message according to the diagnostic flow characteristics and send the diagnostic message to the SDN controller, so that the SDN controller receives the diagnostic message according to the The diagnosis message sent by the device determines the path diagnosis result of the hybrid overlay network.
  • An embodiment of the present application provides a path diagnosis system in an SDN hybrid overlay network, including: a controller diagnosis processing unit disposed in the SDN controller and a network device diagnosis processing unit disposed in multiple devices in the hybrid overlay network ;
  • the controller diagnostic processing unit is set to send a diagnostic message to the network device diagnostic processing unit in the multiple devices in the hybrid overlay network, the diagnostic message has the same structure as the service message, and encapsulates the characteristics of the diagnostic flow;
  • the network device The diagnostic processing unit is configured to forward the diagnostic message according to the diagnostic flow characteristics and send the diagnostic message to the controller diagnostic processing unit; the controller diagnostic processing unit is also configured to receive the diagnostic message
  • the diagnosis message sent by the network device diagnosis processing unit in the message device determines the path diagnosis result of the hybrid overlay network.
  • An embodiment of the present application provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to implement the path diagnosis method in the SDN hybrid overlay network in the foregoing embodiments.
  • FIG. 1 is a schematic structural diagram of an SDN hybrid overlay network in an embodiment of the present application
  • Fig. 2 is a flowchart of a method for path diagnosis in an SDN hybrid overlay network provided in an embodiment of the present application
  • FIG. 3 is a schematic diagram of a diagnostic message sending path of a path diagnostic method in an SDN hybrid overlay network provided by an embodiment of the present application;
  • FIG. 4 is a flow chart of another method for path diagnosis in an SDN hybrid overlay network provided in an embodiment of the present application.
  • FIG. 5 is a flow chart of another method for path diagnosis in an SDN hybrid overlay network provided in an embodiment of the present application.
  • FIG. 6 is a flow chart of another method for path diagnosis in an SDN hybrid overlay network provided in an embodiment of the present application.
  • FIG. 7 is a flow chart of another method for path diagnosis in an SDN hybrid overlay network provided in an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a path diagnosis system in an SDN hybrid overlay network provided by an embodiment of the present application.
  • words such as “optionally” or “exemplarily” are used as examples, illustrations or illustrations. Any embodiment or design solution described as “optional” or “exemplary” in the embodiments of the present application shall not be interpreted as being more preferred or more advantageous than other embodiments or design solutions. Rather, the use of words such as “optionally” or “exemplarily” is intended to present related concepts in a concrete manner.
  • FIG. 1 is a schematic structural diagram of an SDN hybrid overlay network in an embodiment of the present application.
  • the SDN hybrid overlay network includes OpenFlow (OpenFlow) domain devices (such as vSwitch switches), EVPN domain devices (such as hardware virtual extended LAN tunnel endpoints (VXLAN Tunnel EndPoint, VTEP) and gateways (GateWay, GW) devices), Underlay devices (such as traditional hardware onion routing (The Onion Route, TOR) and spine (Spine) switches), these devices can be managed by the SDN controller.
  • OpenFlow OpenFlow
  • EVPN domain devices such as hardware virtual extended LAN tunnel endpoints (VXLAN Tunnel EndPoint, VTEP) and gateways (GateWay, GW) devices
  • Underlay devices such as traditional hardware onion routing (The Onion Route, TOR) and spine (Spine) switches
  • the SDN controller establishes OpenFlow connection channels with these devices for the Packet-out delivery and Packet-in delivery of diagnostic messages; at the same time, the SDN controller establishes network configuration (Netconf) connections with EVPN domain devices and Underlay devices, using It is used for distributing configuration data and querying status.
  • the networking includes Layer 2 or Layer 3 networks, VXLAN overlay and underlay networks.
  • the SDN hybrid overlay network includes multiple types of devices, but since different types of devices such as OpenFlow domain devices and EVPN domain devices need to use different methods for path diagnosis, the SDN hybrid overlay network In the case of a fault, it is difficult to quickly locate the fault.
  • FIG. 2 is a flowchart of a path diagnosis method in an SDN hybrid overlay network provided by an embodiment of the present application. As shown in FIG. 2 , the path diagnosis method in the SDN hybrid overlay network provided by this embodiment includes the following steps.
  • Step S210 sending a diagnostic message to multiple devices in the hybrid overlay network, the diagnostic message has the same structure as the service message, and encapsulates the characteristics of the diagnostic flow, and the diagnostic message is used to make the device receiving the diagnostic message according to the characteristics of the diagnostic flow Forward the diagnostic message and send the diagnostic message to the SDN controller.
  • the path diagnosis method in the SDN hybrid overlay network is applied to the SDN controller in the SDN hybrid overlay network.
  • different types of devices have different path diagnosis methods.
  • the SDN controller needs to perform path diagnosis for each type of device. For example, for OpenFlow domain devices, it is necessary to send the packet output (Packet-out) and the packet entry (Packet-out) of the diagnostic message through the OpenFlow channel. in) upload.
  • the SDN controller needs to establish a Netconf connection to deliver configuration data and query status.
  • the SDN controller sends a path diagnosis message with a specific characteristic to multiple devices in the SDN hybrid overlay network , so that all devices that receive the path diagnosis message can capture and send the path diagnosis message, so as to realize efficient path diagnosis in the SDN hybrid overlay network.
  • the SDN controller When the SDN controller needs to perform path diagnosis on the SDN hybrid overlay network, it can send a diagnostic message to multiple devices in the hybrid overlay network.
  • the diagnostic message has the same structure as the service message and encapsulates the characteristics of the diagnostic flow.
  • the structure of the diagnostic message is the same as that of the service message, which means that the diagnostic message shows the same structural characteristics as the normal service message.
  • the diagnosis flow characteristic is also encapsulated in the diagnosis message.
  • the diagnostic flow feature is a specific feature, which is carried in a specific position of the diagnostic message.
  • the SDN controller and multiple devices can obtain the diagnostic flow feature in the diagnostic message from this specific position, so as to determine the received message It is a diagnostic packet, which requires path diagnosis.
  • path fault discovery and presentation in the network can be realized by simulating service traffic.
  • the structure of the diagnostic message is the same as that of the service message, including: the network protocol (Internet Protocol, IP) quintuple of the diagnostic message, the virtual local area network (Virtual Local Area Network, VLAN), the media access control (Media Access Control, MAC) and The service messages are the same. Then, the device that receives the diagnosis message can realize the same message forwarding as the normal service message according to the above-mentioned IP quintuple, VLAN, and MAC. At the same time, the diagnostic message sent by the SDN controller may also specify an incoming port of the diagnostic message.
  • IP Internet Protocol
  • VLAN Virtual Local Area Network
  • MAC Media Access Control
  • the multiple devices in the hybrid overlay network include at least one of an OpenFlow domain switch, an EVPN domain switch, and an underlay switch.
  • multiple devices in the SDN hybrid overlay network can obtain the characteristics of the diagnostic flow encapsulated in the diagnostic packet, and then multiple devices can know that the diagnostic packet is used for The path diagnosis packets are not normal service packets. Then multiple devices first need to forward the received diagnostic message according to the normal service message forwarding process, and at the same time, multiple devices also need to send the diagnostic message to the SDN controller. In this way, on the one hand, multiple devices in the network can forward packets according to the normal forwarding path of service packets, so that diagnostic packets can be forwarded according to the normal forwarding path of service packets, so that real packet forwarding paths can be verified. Diagnosis.
  • the SDN controller can use a unified diagnostic message for the hybrid overlay.
  • the network performs path diagnosis.
  • Multiple devices in the SDN hybrid overlay network can be configured to be capable of matching and identifying diagnostic packets with diagnostic flow characteristics, and forwarding and sending the diagnostic packets.
  • multiple devices in the SDN hybrid overlay network can also perform matching identification and forwarding of diagnostic messages according to the configuration information delivered by the SDN controller.
  • the device receiving the diagnosis message queries the local routing and forwarding table according to various parameters of the diagnosis message, and determines the forwarding port of the diagnosis message, thereby completing the forwarding of the diagnosis message.
  • the device that receives the diagnostic message determines that the message is a diagnostic message according to the characteristics of the diagnostic flow in the diagnostic message, and needs to send the received diagnostic message to the SDN controller, so the device also sends the diagnostic message to the SDN controller.
  • the diagnostic message received by the devices in the network may be directly sent by the SDN controller, or may be forwarded by other devices.
  • Step S220 determine the path diagnosis result of the hybrid overlay network according to the diagnostic message sent by the device that received the diagnostic message.
  • the devices in the network have all forwarded the diagnostic message after receiving the diagnostic message, if the network path between the devices is normal, multiple devices can receive the diagnostic message. If there is a fault, some devices will not be able to receive diagnostic messages forwarded by other devices.
  • the device that receives the diagnosis message will send the diagnosis message to the SDN controller, so the SDN controller can determine the network path diagnosis result according to the received diagnosis message. That is, if a diagnostic message sent by a device in the network is received, it means that the path from which the diagnostic message is sent to the device is normal.
  • the diagnostic packets sent by the devices can determine which devices have faults in the network paths and obtain the network path diagnosis results.
  • the SDN controller sends a diagnostic message to multiple devices in the hybrid overlay network, wherein the diagnostic message has the same structure as the service message and encapsulates the characteristics of the diagnostic flow, and receives
  • the device receiving the diagnosis message forwards the diagnosis message according to the characteristics of the diagnosis flow and sends the diagnosis message to the SDN controller.
  • the SDN controller determines the path diagnosis result of the hybrid overlay network according to the diagnosis message sent by the device that receives the diagnosis message. , it is possible to perform path diagnosis on a plurality of devices in the SDN hybrid overlay network using a unified diagnostic message, and realize fast path diagnosis in the SDN hybrid overlay network.
  • FIG. 3 is a schematic diagram of a diagnostic message sending path of a path diagnostic method in an SDN hybrid overlay network provided by an embodiment of the present application.
  • the SDN controller constructs a diagnostic message for the simulated service flow, and sends the diagnostic message through the Packet-out mode of the OpenFlow channel at the first node device where the service flow enters the network.
  • Various devices send diagnostic packets to the SDN controller through the Packet-in mode of the OpenFlow channel.
  • FIG. 4 is a flowchart of another path diagnosis method in an SDN hybrid overlay network provided by an embodiment of the present application. As shown in FIG. 4 , the path diagnosis method in the SDN hybrid overlay network provided by this embodiment includes the following steps.
  • Step S410 sending configuration information to multiple devices in the hybrid overlay network, the configuration information is used to instruct multiple devices to forward and send the received diagnostic message according to the diagnostic flow characteristics in the received diagnostic message.
  • the diagnostic message sent by the SDN controller has the same structure as the normal service message, so in order to avoid affecting the normal service message in the SDN hybrid overlay network, the SDN controller can perform network During path diagnosis, configuration information is sent to multiple devices in the SDN hybrid overlay network.
  • the configuration information is used to instruct multiple devices to forward and send received diagnostic messages according to the diagnostic flow characteristics in the received diagnostic messages .
  • the configuration information may include two kinds of information, namely, the characteristics of the diagnostic flow in the diagnostic message, and an action instruction for forwarding and uploading the received diagnostic message after receiving the diagnostic message.
  • the SDN controller may send configuration information to multiple devices in the hybrid overlay network, or may only send configuration information to overlay switches (including OpenFlow domain switches and/or EVPN domain switches). That is to say, the SDN controller may manage all the devices in the network, or may not manage the underlay switch, that is, the underlay switch may not support matching sending of diagnostic messages. Only managed overlay switches can realize network path diagnosis, so not having managed underlay switches does not affect the success or failure of the network path diagnosis result, but only affects the accuracy of the fault location in the diagnosis result.
  • the SDN controller can send the OpenFlow flow table including diagnostic flow characteristics to the device, and the device that receives the OpenFlow flow table forwards and sends the received diagnostic message, and the configuration information is the OpenFlow flow table. That is, for the switch in the OpenFlow domain, the OpenFlow flow table is issued to match the specified characteristic message, and the action is to forward a diagnostic message and send a diagnostic message to the SDN controller.
  • the SDN controller sends an Access Control List (ACL) rule including diagnostic flow characteristics to the device, and the device that receives the ACL rule forwards and sends the received diagnostic message , the configuration information is the ACL rule. That is, for EVPN domain switches or underlay switches, the ACL configuration is delivered through Netconf, and the ACL rules are packets matching specified characteristics. The action is to forward a diagnostic packet and send a diagnostic packet to the SDN controller.
  • ACL Access Control List
  • the diagnostic flow feature in the configuration information includes an IP Differentiated Services Code Point (Differentiated Services Code Point, DSCP) value or a packet payload byte code.
  • DSCP IP Differentiated Services Code Point
  • the SDN controller can issue a flow table matching the specified IP DSCP through the OpenFlow channel, as follows:
  • the SDN controller can deliver the ACL configuration matching the specified IP DSCP through Netconf, as follows:
  • the SDN controller can deliver the ACL configuration matching the specified packet payload bytecode through Netconf, as follows:
  • Step S420 sending a diagnostic message to multiple devices in the hybrid overlay network, the diagnostic message has the same structure as the service message, and encapsulates the characteristics of the diagnostic flow, and the diagnostic message is used to make the device receiving the diagnostic message according to the characteristics of the diagnostic flow Forward the diagnostic message and send the diagnostic message to the SDN controller.
  • Step S430 determine the path diagnosis result of the hybrid overlay network according to the diagnostic message sent by the device that received the diagnostic message.
  • step S440 the SDN controller sends configuration deletion information to multiple devices, and the configuration deletion information is used to stop the device receiving the configuration deletion information from forwarding and sending the received diagnostic message.
  • the SDN controller can also send configuration deletion information to multiple devices in the SDN hybrid overlay network, indicating that the configuration deletion information is received The device deletes the received configuration information.
  • the device that receives the configuration deletion information can delete the configuration information received from the SDN controller, then the device that receives the configuration deletion information can stop forwarding and sending the received diagnostic message, thus completing the path diagnosis process.
  • the diagnostic message sent by the SDN controller can also include the IP life cycle (Time To Live, TTL) value, and the device that receives the diagnostic message judges the IP TTL value in the diagnostic message. If the IP TTL value is greater than 1, it will After the IP TTL value is reduced by 1, the diagnostic message is forwarded according to the characteristics of the diagnostic flow and the diagnostic message is sent to the SDN controller; if the IP TTL value is less than or equal to 1, the diagnostic message is sent to the SDN controller.
  • the IP TTL value is a value determined by the SDN controller according to the path diagnosis requirements. It is used to control the maximum transmission path length of the diagnosis message, which can avoid the impact on the business system caused by the diagnosis message being sent to the destination host.
  • the device forwarding the diagnostic message will decrement the IP TTL value by 1.
  • the IP TTL value in the diagnostic message is less than or equal to 1, the device that receives the diagnostic message will stop forwarding the diagnostic message.
  • the IP TTL is also used to reflect the path information of the diagnostic message.
  • the SDN controller can determine the forwarding path of the diagnostic message in the hybrid overlay network according to the IP TTL value in the diagnostic message sent by the device that received the diagnostic message , according to the forwarding path and the topology map of the hybrid overlay network, determine the path diagnosis result of the hybrid overlay network.
  • the SDN controller judges whether there is a network path failure according to whether the tail node device has received and sent a diagnostic message.
  • the egress link of the switch node with the smallest IP TTL in the diagnostic message sent or the switch at the other end of the egress link is possible point of failure.
  • the expected forwarding path and the path obtained by the actual diagnosis can be drawn, and the two paths can be visualized and compared, so as to more accurately determine whether the forwarding path is wrong or the network node is faulty.
  • Devices in the hybrid overlay network can be divided into devices that are directly connected to the SDN controller and devices that are not directly connected to the SDN controller.
  • the devices that are directly connected to the SDN controller are called head node devices.
  • the first node device is connected to the SDN controller through a local direct connection port. Then, if the device receiving the diagnostic message determines that the forwarding port of the diagnostic message is a local directly connected port, the device forwards the diagnostic message according to the characteristics of the diagnostic flow and sends the diagnostic message to the SDN controller.
  • the device that receives the diagnostic message determines that the forwarding port of the diagnostic message is a VXLAN tunnel port, it encapsulates the diagnostic message in VXLAN, forwards the diagnostic message according to the characteristics of the diagnostic flow, and sends the diagnostic message to the SDN controller.
  • the SDN controller can uniformly use the OpenFlow packet-out method to deliver original diagnostic packets to the head node device.
  • the specified output port is pipeline OFPP_TABLE (0xfffffff9); for EVPN domain switches, the specified output port is OFPP_NORMAL (0xfffffffa).
  • the first node device is the first VTEP access switch where service traffic enters the SDN hybrid overlay network. It can be an OpenFlow domain switch or an EVPN domain switch.
  • the head node device receives the original diagnostic message sent by the SDN controller packet-out, and searches the MAC forwarding table and IP routing table according to the specified ingress port and the IP and MAC of the original diagnostic message.
  • the forwarding egress may be a local direct connection port, which may also be a VXLAN tunnel port. If the forwarding egress is a local directly connected port, the original diagnostic packet is directly sent to the egress; if the forwarding egress is a VXLAN tunnel port, the original diagnostic packet is VXLAN-encapsulated and sent to the physical egress corresponding to the tunnel port.
  • IP DSCP IP DSCP or packet payload bytecode
  • IP DSCP IP DSCP or packet payload bytecode
  • Non-head node devices OpenFlow switches, EVPN switches, underlay switches
  • in the network forward the query service forwarding table items of the diagnostic message, and at the same time forward and send a message to the SDN controller by matching the diagnostic flow characteristics on the egress port .
  • Lookup table forwarding query IP routing table, address resolution protocol/neighbor discovery (Address Resolution Protocol/Neighbor Discovery, ARP/ND) table, MAC forwarding table, get the outbound port; for non-head node devices, receive packets from the service network port After that, look up the table and forward it like normal business. Multiple devices process the IP TTL and IP DSCP values accordingly when forwarding diagnostic messages.
  • address resolution protocol/neighbor discovery Address Resolution Protocol/Neighbor Discovery, ARP/ND
  • ARP/ND Address Resolution Protocol/Neighbor Discovery
  • the OpenFlow domain switch matches the OpenFlow flow table, the action is to send the diagnostic message to the egress port and send the diagnostic message to the SDN controller, and the diagnostic message is sent to the SDN controller through OpenFlow
  • the processing of the IP TTL value refers to the inheritance during VXLAN encapsulation/decapsulation, and the decrement processing during IP routing and forwarding.
  • the VTEP point switch in the OpenFlow domain or EVPN domain when encapsulating the VXLAN tunnel, inherits the IP TTL value of the diagnostic message to the VXLAN outer IP header; when decapsulating VXLAN, it needs to inherit the IP TTL value of the VXLAN outer IP header To the IP header of the VXLAN inner-layer diagnostic message; when performing IP routing forwarding in the OpenFlow domain, EVPN domain, and underlay switch, first determine whether the TTL of the IP header is less than or equal to 1, and if the TTL of the IP header is less than or equal to 1, the device stops forwarding , otherwise subtract one from the IP TTL value and forward it.
  • the processing of the IP DSCP value refers to the inheritance during VXLAN encapsulation.
  • the VTEP point switch in the OpenFlow domain or EVPN domain when encapsulating the VXLAN tunnel, inherits the IP DSCP value of the diagnostic message to the VXLAN outer IP header, which is convenient for the diagnosis of the underlay switch. The characteristics of the packet match.
  • FIG. 5 is a flowchart of another path diagnosis method in an SDN hybrid overlay network provided by an embodiment of the present application. As shown in Figure 5, the path diagnosis method in the SDN hybrid overlay network provided by this embodiment includes:
  • Step S510 receiving the diagnosis message sent by the SDN controller, the diagnosis message has the same structure as the service message, and encapsulates the characteristics of the diagnosis flow.
  • Step S520 forwarding the diagnostic message according to the characteristics of the diagnostic flow and sending the diagnostic message to the SDN controller, so that the SDN controller determines the path diagnosis result of the hybrid overlay network according to the diagnostic message sent by the device receiving the diagnostic message.
  • the path diagnosis method in the SDN hybrid overlay network provided in this embodiment is applied to the devices in the SDN hybrid overlay network. Its implementation and technical effects have been described in the embodiments shown in FIG. 2 to FIG. 4 , and will not be repeated here repeat.
  • the diagnostic message sent by the SDN controller before receiving the diagnostic message sent by the SDN controller, it also includes: receiving configuration information sent by the SDN controller, the configuration information is used to instruct multiple devices according to the received diagnostic message
  • the diagnosis flow feature forwards and sends the received diagnosis packets.
  • the multiple devices in the hybrid overlay network include at least one of an OpenFlow domain switch, an EVPN domain switch, and an underlay switch.
  • receiving the configuration information sent by the SDN controller includes: when the device is an OpenFlow domain switch, receiving the OpenFlow flow table sent by the SDN controller including diagnostic flow characteristics, receiving the OpenFlow flow table The device forwards and sends the received diagnostic message, and the configuration information is the OpenFlow flow table; when the device is an EVPN domain switch or an underlay switch, it receives the ACL rule sent by the SDN controller including the characteristics of the diagnostic flow, and the device that receives the ACL rule Forward and send the received diagnostic packets, and the configuration information is ACL rules.
  • the diagnostic flow feature includes an IP DSCP value or a message payload bytecode.
  • the structure of the diagnostic message is the same as that of the service message, including: the IP quintuple, VLAN, and MAC of the diagnostic message are the same as those of the service message.
  • the diagnosis message is forwarded according to the characteristics of the diagnosis flow and sent to the SDN controller, including: if the device receiving the diagnosis message determines that the forwarding port of the diagnosis message is a local direct If the device that receives the diagnostic message determines that the outgoing port of the diagnostic message is a VXLAN tunnel port, it forwards the diagnostic message to the SDN controller. After VXLAN encapsulation, the diagnostic packet is forwarded according to the characteristics of the diagnostic flow and sent to the SDN controller.
  • the diagnostic message also includes an IP TTL value, and forwards the diagnostic message according to the characteristics of the diagnostic flow and sends the diagnostic message to the SDN controller, including: judging the IP TTL value in the diagnostic message , if the IP TTL value is greater than 1, the IP TTL value will be reduced by 1, and the diagnostic message will be forwarded according to the characteristics of the diagnostic flow and sent to the SDN controller; if the IP TTL value is less than or equal to 1, the diagnostic message will be sent to the SDN controller Send a diagnostic message.
  • FIG. 6 is a flowchart of another path diagnosis method in an SDN hybrid overlay network provided by an embodiment of the present application.
  • FIG. 6 is a flow chart of processing when a head node device in an overlay network receives a diagnosis message.
  • the path diagnosis method in an SDN hybrid overlay network provided in this embodiment includes the following steps.
  • Step S600 receiving a diagnosis message sent by the SDN controller.
  • Step S610 judging whether the current node is an OpenFlow switch, if the current node is an OpenFlow switch, execute step S620, otherwise execute step S660.
  • Step S620 execute Output to the OFPP_TABLE pipeline, check the flow table and forward normally.
  • Step S630 if the routing table is checked, the IP TTL is decremented by 1.
  • Step S640 the egress flow table matches the IP DSCP, copies the diagnostic message Packet-in and sends it to the SDN controller.
  • step S650 the egress performs VXLAN encapsulation on the diagnosis message, inheriting IP TTL and IP DSCP.
  • Step S660 judging according to the carried action (ACTION) that it is a diagnostic message, checking the software table and forwarding it.
  • Step S670 if the IP routing table is checked, the IP TTL is decremented by 1.
  • step S680 the egress ACL matches the IP DSCP or feature bytecode, and copies the diagnostic message Packet-in to the SDN controller.
  • step S690 the egress performs VXLAN encapsulation on the diagnosis message, inheriting IP TTL and IP DSCP.
  • FIG. 7 is a flow chart of another path diagnosis method in an SDN hybrid overlay network provided by an embodiment of the present application.
  • FIG. 7 is a flow chart of processing when a non-head node device in the overlay network receives a diagnosis message.
  • the path diagnosis method in the SDN hybrid overlay network provided by this embodiment includes the following steps.
  • step S700 the port receives a diagnosis message.
  • Step S710 judging whether the current node is a VTEP switch, if the current node is a VTEP switch, execute step S720, otherwise execute step S770.
  • Step S720 decapsulate the VXLAN, inherit the IP TTL to the inner layer, and look up the forwarding plane for forwarding.
  • Step S730 if the routing table is checked, the IP TTL is decremented by 1.
  • Step S740 check the ACL or flow table to match the IP DSCP or feature bytecode, copy the diagnostic message Packet-in and send it to the SDN controller.
  • Step S750 judging whether the IP TTL is less than or equal to 1, if the IP TTL is less than or equal to 1, stop forwarding the diagnosis message, otherwise execute step S760.
  • Step S760 sending a diagnostic message from the egress port, if the egress is a tunnel, VXLAN encapsulation is performed on the diagnostic message, and IP TTL and IP DSCP are inherited.
  • Step S770 look up the table and forward the VXLAN-encapsulated diagnosis message.
  • Step S780 if the IP routing table is checked, the IP TTL is decremented by 1.
  • step S790 the egress ACL matches the IP DSCP or the feature bytecode, and copies the diagnostic message Packet-in to the SDN controller.
  • the path diagnosis method in the SDN hybrid overlay network adopts the packet-out and packet-in of OpenFlow as the control channel, simulates the service flow for diagnosis and IP forwarding, and identifies the diagnosis message by feature codes such as IP DSCP, TTL is used to reflect the path information and fault points of forwarding path nodes of VXLAN overlay and underlay, which solves the fault diagnosis problem of service forwarding path in hybrid overlay SDN network.
  • OpenFlow devices, EVPN devices, and underlay devices can use a unified diagnosis method to simulate service traffic and realize end-to-end path fault discovery and presentation.
  • the technical solution and system can also be used for path diagnosis.
  • the usage scenarios of this application are not limited to hybrid overlay networks, and are also applicable to non-hybrid overlay networks, such as a single pure OpenFlow SDN, or pure EVPN SDN, or even non-overlay ordinary IP networks.
  • FIG. 8 is a schematic structural diagram of a path diagnosis system in an SDN hybrid overlay network provided by an embodiment of the present application.
  • the path diagnosis system in the SDN hybrid overlay network provided in this embodiment includes: a controller diagnosis processing unit 81 arranged in the SDN controller and a network device diagnosis processing unit 82 arranged in multiple devices in the hybrid overlay network.
  • the controller diagnostic processing unit 81 is configured to send a diagnostic message to the network device diagnostic processing unit 82 in multiple devices in the hybrid overlay network, the diagnostic message has the same structure as the service message, and encapsulates diagnostic flow characteristics; the network device diagnosis The processing unit 82 is set to forward the diagnostic message according to the characteristics of the diagnostic flow and send the diagnostic message to the controller diagnostic processing unit 81; the controller diagnostic processing unit 81 is also set to receive the diagnostic message according to the The diagnosis message sent by the diagnosis processing unit 82 determines the path diagnosis result of the hybrid overlay network.
  • the network device diagnosis processing unit 82 may include an OpenFlow diagnosis processing unit, an EVPN diagnosis processing unit, and an underlay diagnosis processing unit.
  • the network device diagnosis processing unit 82 arranged in the OpenFlo domain switch is an OpenFlow diagnosis processing unit
  • the network device diagnosis processing unit 82 arranged in the EVPN domain switch is an EVPN diagnosis processing unit
  • the network device diagnosis processing unit 82 arranged in the underlay switch A processing unit for underlay diagnostics.
  • the OpenFlow diagnostic processing unit is located inside the OpenFlow domain switch (generally a vSwitch), and is configured to receive the diagnostic feature matching flow table issued by the SDN controller, and generate a flow table pipeline; when the diagnosis starts, if the OpenFlow diagnostic processing unit as the first node receives The diagnosis message sent by the SDN controller is processed according to the flow table pipeline; when the OpenFlow diagnosis processing unit receives the message from the port of the forwarding plane as a non-first node, it also performs table lookup processing according to the flow table pipeline, including VXLAN Encapsulation and decapsulation, when the packet matches the diagnosis characteristic flow table, according to the action, the packet is forwarded and sent in packet-in. When VXLAN forwards the packet, it supports the inheritance processing of the IP TTL value.
  • the EVPN diagnostic processing unit is located inside the EVPN domain switch, and is configured to receive the diagnostic feature matching configuration delivered by the SDN controller, generate ACL mirroring rules, and deliver the forwarding plane.
  • the EVPN diagnostic processing unit as the head node receives the diagnostic message sent by the SDN controller, it will perform table lookup processing on the control plane; as the non-head node, the EVPN diagnostic processing unit will match the ACL of the forwarding plane to the diagnostic message
  • the mirror image sends the diagnostic message to the SDN control plane, and the diagnostic processing unit of the SDN control plane sends the diagnostic message to the SDN controller through the packet-in of OpenFlow; when VXLAN forwards the diagnostic message, it supports IP TTL value Inheritance processing.
  • the underlay diagnosis processing unit is located inside the underlay switch and is configured to receive the diagnosis feature matching configuration delivered by the SDN controller, generate ACL mirroring rules and deliver the forwarding plane.
  • the mirror sends the diagnostic packet to the SDN control plane
  • the diagnostic processing unit of the SDN control plane sends the diagnostic packet to the SDN controller through the OpenFlow packet-in.
  • the embodiment of the present application also provides a storage medium containing computer-executable instructions.
  • the computer-executable instructions When executed by a computer processor, the computer-executable instructions are used to execute a path diagnosis method in an SDN hybrid overlay network.
  • the method includes: Multiple devices in the network send diagnostic packets.
  • the diagnostic packets have the same structure as the service packets and encapsulate the characteristics of the diagnostic flow.
  • the diagnostic packets are used to enable the device that receives the diagnostic packets to forward the diagnostic packets according to the characteristics of the diagnostic flow and send the diagnostic packets to the
  • the SDN controller sends a diagnosis message; determines the path diagnosis result of the hybrid overlay network according to the diagnosis message sent by the device that receives the diagnosis message.
  • the embodiment of the present application also provides a storage medium containing computer-executable instructions.
  • the computer-executable instructions When executed by a computer processor, the computer-executable instructions are used to execute a path diagnosis method in an SDN hybrid overlay network.
  • the method includes: receiving an SDN control
  • the diagnostic message sent by the device, the diagnostic message has the same structure as the service message, and encapsulates the diagnostic flow characteristics; forwards the diagnostic message according to the diagnostic flow characteristics and sends the diagnostic message to the SDN controller, so that the SDN controller can receive the diagnostic message according to the received Diagnosis packets
  • the diagnostic packets sent by the device determine the path diagnosis results of the hybrid overlay network.
  • the various embodiments of the present application can be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software executed by a controller, microprocessor or other computing device, although the application is not limited thereto.
  • Computer program instructions may be assembly instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or written in any combination of one or more programming languages source or object code.
  • ISA Instruction Set Architecture
  • Any logic flow block diagrams in the drawings of the present application may represent program steps, or may represent interconnected logic circuits, modules and functions, or may represent a combination of program steps and logic circuits, modules and functions.
  • Computer programs can be stored on memory.
  • the memory may be of any type suitable for the local technical environment and may be implemented using any suitable data storage technology, such as but not limited to Read-Only Memory (ROM), Random Access Memory (RAM), Optical Memory devices and systems (Digital Video Disc (DVD) or Optical Disc (Compact Disc, CD)), etc.
  • Computer-readable media may include non-transitory storage media.
  • Data processors may be any suitable local technology
  • the type of environment such as but not limited to general purpose computer, special purpose computer, microprocessor, digital signal processor (Digital Signal Processing, DSP), application specific integrated circuit (Application Specific Integrated Circuit, SAIC), programmable logic device (Field-Programmable Gate Array, FPGA) and processors based on multi-core processor architecture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

本申请提出一种SDN混合overlay网络中的路径诊断方法和系统，一种SDN混合overlay网络中的路径诊断方法应用于SDN控制器，包括：向混合overlay网络中的多个设备发送诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征，所述诊断报文用于使接收到所述诊断报文的设备根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文；根据接收到所述诊断报文的设备上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。

Description

SDN混合overlay网络中的路径诊断方法和系统 技术领域
本申请涉及网络通信技术，例如涉及一种SDN混合overlay网络中的路径诊断方法和系统。
背景技术
软件定义网络(Software Defined Networking，SDN)是一种控制逻辑和数据转发分离的创新网络架构。数据中心(Data Center，DC)、广域网(Wide Area Network，WAN)等领域应用SDN技术时，基本都采用了虚拟扩展局域网(Virtual Extensible Local Area Network，VXLAN)隧道技术，提高二层网络(overlay网络)扩展性和部署的灵活性，同时也能简化overlay业务的网络层次结构。
当SDN出现故障时，需要进行路径诊断，SDN中路径诊断的基本原理是：控制器触发业务交换机发出诊断报文，模拟业务流，封装正常业务流相近的互联网协议(Internet Protocol，IP)五元组信息；源交换机将该诊断报文按照业务的转发路径进行转发，路径中接收到诊断报文的交换机将接收信息上报给控制器，控制器接收到接收信息后通过分析计算，结合物理链路，呈现出路径诊断结果；如果诊断报文未送达期望的尾节点，则控制器提示相应的故障点。
由于在混合overlay场景中，涉及OpenFlow域与以太网虚拟专用网络(Ethernet Virtual Private Network，EVPN)域、overlay与底层网络(underlay网络)这几种网络技术和封装类型，缺乏统一的故障诊断方法。Ping、Trace等诊断技术仅支持单一技术和场景，无法覆盖这几种网络节点和路径，业务流量异常时快速定位故障节点比较困难。
发明内容
本申请提供一种SDN混合overlay网络中的路径诊断方法和系统，能够对SDN混合overlay网络中的多种设备使用统一的诊断报文进行路径诊断，实现了SDN混合overlay网络中的快速路径诊断。
本申请实施例提供了一种SDN混合overlay网络中的路径诊断方法，应用于SDN控制器，包括：向混合overlay网络中的多个设备发送诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征，所述诊断报文用于使接收 到所述诊断报文的设备根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文；根据所述接收到所述诊断报文的设备上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。
本申请实施例提供了一种SDN混合overlay网络中的路径诊断方法，应用于SDN混合overlay网络中的设备，包括：接收SDN控制器发送的诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征；根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文，以使所述SDN控制器根据接收到所述诊断报文的设备上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。
本申请实施例提供了一种SDN混合overlay网络中的路径诊断装置，包括：发送模块，设置为向混合overlay网络中的多个设备发送诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征，所述诊断报文用于使接收到所述诊断报文的设备根据所述诊断流特征转发所述诊断报文并向SDN控制器上送所述诊断报文；诊断模块，设置为根据所述接收到所述诊断报文的设备上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。
本申请实施例提供了一种SDN混合overlay网络中的路径诊断装置，包括：接收模块，设置为接收SDN控制器发送的诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征；发送模块，设置为根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文，以使所述SDN控制器根据接收到所述诊断报文的设备上送的诊断报文确定所述混合overlay网络的路径诊断结果。
本申请实施例提供了一种SDN混合overlay网络中的路径诊断系统，包括：设置于SDN控制器中的控制器诊断处理单元和设置于混合overlay网络中的多个设备中的网络设备诊断处理单元；控制器诊断处理单元被设置为向混合overlay网络中的多个设备中的网络设备诊断处理单元发送诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征；网络设备诊断处理单元被设置为根据所述诊断流特征转发所述诊断报文并向所述控制器诊断处理单元上送所述诊断报文；控制器诊断处理单元还被设置为根据接收到所述诊断报文的设备中的网络设备诊断处理单元上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。
本申请实施例提供了一种计算机可读存储介质，存储有计算机可执行指令，计算机可执行指令用于实现上述实施例中的SDN混合overlay网络中的路径诊断方法。
附图说明
图1是本申请实施例中的SDN混合overlay网络的结构示意图；
图2为本申请实施例提供的一种SDN混合overlay网络中的路径诊断方法的流程图；
图3为本申请实施例提供的SDN混合overlay网络中的路径诊断方法的诊断报文发送路径示意图；
图4为本申请实施例提供的另一种SDN混合overlay网络中的路径诊断方法的流程图；
图5为本申请实施例提供的另一种SDN混合overlay网络中的路径诊断方法的流程图；
图6为本申请实施例提供的另一种SDN混合overlay网络中的路径诊断方法的流程图；
图7为本申请实施例提供的另一种SDN混合overlay网络中的路径诊断方法的流程图；
图8为本申请实施例提供的一种SDN混合overlay网络中的路径诊断系统的结构示意图。
具体实施方式
下文中将结合附图对本申请的实施例进行说明。可以理解的是，此处所描述的实施例仅仅用于解释本申请，而非对本申请的限定。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。另外还需要说明的是，为了便于描述，附图中仅示出了与本申请相关的部分结构。
在本申请实施例中，“可选地”或者“示例性地”等词用于表示作例子、例证或说明。本申请实施例中被描述为“可选地”或者“示例性地”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“可选地”或者“示例性地”等词旨在以具体方式呈现相关概念。
图1是本申请实施例中的SDN混合overlay网络的结构示意图。如图1所示，SDN混合overlay网络中包含开放流(OpenFlow)域设备(例如vSwitch交换机)、EVPN域设备(例如硬件虚拟扩展局域网隧道端点(VXLAN Tunnel EndPoint，VTEP)和网关(GateWay，GW)设备)、Underlay设备(例如传统硬件洋葱路由(The Onion Route，TOR)和脊(Spine)交换机)，这些设备可以由SDN控制器统一纳管。SDN控制器与这些设备建立OpenFlow连接通道， 用于诊断报文的Packet-out下发和Packet-in上送；同时，SDN控制器与EVPN域设备、Underlay设备建立网络配置(Netconf)连接，用于配置数据的下发和状态查询。组网包含二层或三层网络、VXLAN的overlay和underlay网络。
从图1中可以看出，SDN混合overlay网络中，包括多种类型的设备，但由于不同类型的设备例如OpenFlow域设备和EVPN域设备，需要通过不同方法进行路径诊断，因此在SDN混合overlay网络中，在发生故障后，难以进行快速的故障定位。
图2为本申请实施例提供的一种SDN混合overlay网络中的路径诊断方法的流程图。如图2所示，本实施例提供的SDN混合overlay网络中的路径诊断方法包括如下步骤。
步骤S210，向混合overlay网络中的多个设备发送诊断报文，诊断报文与业务报文结构相同，且封装诊断流特征，诊断报文用于使接收到诊断报文的设备根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文。
本实施例提供的SDN混合overlay网络中的路径诊断方法应用于SDN混合overlay网络中的SDN控制器，基于图1所示场景，在SDN混合overlay网络中，由于不同类型的设备具有不同的路径诊断流程，SDN控制器需要针对每种类型的设备分别进行路径诊断，例如对于OpenFlow域设备，就需要通过OpenFlow通道进行诊断报文的数据包输出(Packet-out)下发和数据包进入(Packet-in)上送。而对于EVPN域设备和underlay设备，SDN控制器需要建立Netconf连接，从而进行配置数据的下发和状态查询。为了解决SDN混合overlay网络中的路径诊断效率较低的问题，本申请提供的路径诊断方法中，SDN控制器通过向SDN混合overlay网络中的多个设备发送具有一种特定特征的路径诊断报文，使得接收到路径诊断报文的设备均可以捕获并上送该路径诊断报文，从而在SDN混合overlay网络中实现高效地路径诊断。
SDN控制器在需要对SDN混合overlay网络进行路径诊断时，可以向混合overlay网络中的多个设备发送诊断报文，该诊断报文与业务报文结构相同，且封装诊断流特征。诊断报文与业务报文结构相同，是指诊断报文体现出与正常的业务报文相同的结构特征，对于网络中接收到该诊断报文的设备，在接收到诊断报文后，相当于接收到正常的业务报文，将按与正常业务报文相同的处理方式对其进行处理。当然为了实现对网络的路径诊断，在诊断报文中还封装有诊断流特征。诊断流特征是一种特定的特征，携带在诊断报文的特定位置中，SDN控制器和多个设备均可以从该特定位置获取诊断报文中的诊断流特征，从而确定接收到的报文是诊断报文，需要进行路径诊断。这样对于SDN混合overlay网络中的多个设备，可以通过仿真业务流量的方式，实现网络中的路径故障发 现和呈现。
诊断报文与业务报文结构相同，包括：诊断报文的网络协议(Internet Protocol，IP)五元组、虚拟局域网(Virtual Local Area Network，VLAN)、介质访问控制(Media Access Control，MAC)与业务报文相同。那么接收到诊断报文的设备就可以根据上述IP五元组、VLAN、MAC，实现与正常的业务报文相同的报文转发。同时，SDN控制器发送的诊断报文还可以指定诊断报文的入端口。
在本实施例中，混合overlay网络中的多个设备包括OpenFlow域交换机、EVPN域交换机、underlay交换机中的至少一种。
SDN混合overlay网络中的多个设备在接收到SDN控制器发送的诊断报文后，可以获取到诊断报文中封装的诊断流特征，然后多个设备就能够获知该诊断报文是用于进行路径诊断的报文，并不是正常的业务报文。那么多个设备首先需要根据正常的业务报文转发流程转发接收到的诊断报文，同时多个设备还需要向SDN控制器上送诊断报文。这样一方面网络中的多个设备可以按照业务报文的正常转发路径转发报文，使得诊断报文能够按照业务报文的正常转发路径转发诊断报文，从而能够对真实的报文转发路径进行诊断，另一方面对于不同类型的设备，均可以通过识别诊断报文中的诊断流特征，获知需要进行诊断报文的转发和上送，使得SDN控制器可以通过统一的诊断报文对混合overlay网络进行路径诊断。SDN混合overlay网络中的多个设备可以被配置为能够匹配识别具有诊断流特征的诊断报文，并转发以及上送诊断报文的能力。或者SDN混合overlay网络中的多个设备也可以根据SDN控制器下发的配置信息，进行诊断报文的匹配识别和转发上送。
接收到诊断报文的设备根据诊断报文的多种参数，查询本地的路由转发表，确定该诊断报文的转发端口，从而完成诊断报文的转发。同时，接收到诊断报文的设备根据诊断报文中的诊断流特征确定该报文为诊断报文，需要向SDN控制器上送接收到的诊断报文，因此该设备还向SDN控制器上送接收到的诊断报文。网络中的设备接收到的诊断报文可以是SDN控制器直接发送的，也可以是其他设备转发的。
步骤S220，根据接收到诊断报文的设备上送的诊断报文确定混合overlay网络的路径诊断结果。
由于网络中的设备在接收到诊断报文后，均进行了诊断报文的转发，若设备间的网络路径正常，则多个设备均能接收到该诊断报文，若设备间的网络路径出现故障，则将会有设备无法接收到其他设备转发的诊断报文。而接收到诊断报文的设备会向SDN控制器上送该诊断报文，那么SDN控制器就能够根据 接收到的诊断报文，确定网络路径诊断结果。也就是若接收到网络中一设备上送的诊断报文，则意味着该诊断报文发送至该设备的路径是正常的，SDN控制器可以根据预先绘制的网络拓扑图，确定未接收到哪些设备上送的诊断报文，即可确定哪些设备之间的网络路径存在故障，得到网络路径诊断结果。
本实施例提供的SDN混合overlay网络中的路径诊断方法，由SDN控制器向混合overlay网络中的多个设备发送诊断报文，其中诊断报文与业务报文结构相同且封装诊断流特征，接收到诊断报文的设备根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文，SDN控制器根据接收到诊断报文的设备上送的诊断报文确定混合overlay网络的路径诊断结果，能够对SDN混合overlay网络中的多个种设备使用统一的诊断报文进行路径诊断，实现了SDN混合overlay网络中的快速路径诊断。
图3为本申请实施例提供的SDN混合overlay网络中的路径诊断方法的诊断报文发送路径示意图。如图3所示，SDN控制器构造仿真业务流的诊断报文，在业务流量进入网络的首节点设备通过OpenFlow通道的Packet-out方式指定发送诊断报文。多种设备通过OpenFlow通道的Packet-in方式向SDN控制器上送诊断报文。
图4为本申请实施例提供的另一种SDN混合overlay网络中的路径诊断方法的流程图。如图4所示，本实施例提供的SDN混合overlay网络中的路径诊断方法包括如下步骤。
步骤S410，向混合overlay网络中的多个设备发送配置信息，配置信息用于指示多个设备根据接收到的诊断报文中的诊断流特征转发并上送接收到的诊断报文。
由于图2所示实施例中，SDN控制器发送的诊断报文与正常业务报文结构相同，那么为了避免对SDN混合overlay网络中的正常业务报文产生影响，SDN控制器可以在需要进行网络路径诊断时，再向SDN混合overlay网络中的多个设备发送配置信息，该配置信息用于指示多个设备根据接收到的诊断报文中的诊断流特征转发并上送接收到的诊断报文。配置信息中可以包括两种信息，分别是诊断报文中的诊断流特征，以及接收到诊断报文后转发并上送接收到的诊断报文的动作指示。
SDN控制器可以向混合overlay网络中的多个设备均发送配置信息，也可以仅向overlay交换机(包括OpenFlow域交换机和/或EVPN域交换机)发送配置信息。也就是说，SDN控制器可以纳管网络中的所有设备，也可以不纳管underlay交换机，即underlay交换机可以不支持诊断报文的匹配的上送。仅纳管overlay交换机已经能够实现网络路径的诊断，因此不纳管underlay交换机不影响网络 路径诊断结果的成功与失败，只是影响诊断结果中故障位置的精确度。当设备为OpenFlow域交换机时，SDN控制器可以向设备发送包括诊断流特征的OpenFlow流表，接收到OpenFlow流表的设备转发并上送接收到的诊断报文，配置信息即OpenFlow流表。也就是对于OpenFlow域交换机是下发OpenFlow流表，匹配指定特征报文，动作是转发一份诊断报文并上送一份诊断报文到SDN控制器。
当设备为EVPN域交换机或underlay交换机时，SDN控制器向设备发送包括诊断流特征的访问控制列表(Access Control Lists，ACL)规则，接收到ACL规则的设备转发并上送接收到的诊断报文，配置信息即ACL规则。也就是对于EVPN域交换机或underlay交换机，是通过Netconf下发ACL配置，ACL规则是匹配指定特征的报文，动作是转发一份诊断报文并上送一份诊断报文到SDN控制器。
可选地，配置信息中的诊断流特征包括IP差分服务代码点(Differentiated Services Code Point，DSCP)值或报文净荷字节码。
例如，对于OpenFlow域交换机，SDN控制器可以通过OpenFlow通道下发匹配指定IP DSCP的流表，如下所示：
table:51  priority＝245,ip,metadata＝0x28ac/0xffffff,ip_dscp＝48cookie:0xffffffff0000164a
actions＝output:49156,CONTROLLER:65535
例如，对于EVPN域交换机或underlay交换机，SDN控制器可以通过Netconf下发匹配指定IP DSCP的ACL配置，如下所示：
Figure PCTCN2022098855-appb-000001
再例如，对于EVPN域交换机或underlay交换机，SDN控制器可以通过Netconf下发匹配指定报文净荷字节码的ACL配置，如下所示：
Figure PCTCN2022098855-appb-000002
步骤S420，向混合overlay网络中的多个设备发送诊断报文，诊断报文与业务报文结构相同，且封装诊断流特征，诊断报文用于使接收到诊断报文的设备根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文。
步骤S430，根据接收到诊断报文的设备上送的诊断报文确定混合overlay网络的路径诊断结果。
步骤S440，SDN控制器向多个设备发送配置删除信息，配置删除信息用于使接收到配置删除信息的设备停止转发和上送接收到的诊断报文。
可选地，在SDN控制器确定完成路径诊断后，为了避免对正常业务报文的影响，SDN控制器还可以向SDN混合overlay网络中的多个设备发送配置删除信息，指示接收到配置删除信息的设备删除接收到的配置信息。
接收到配置删除信息的设备，即可删除从SDN控制器接收到的配置信息，那么接收到配置删除信息的设备即可停止转发和上送接收到的诊断报文，从而完成路径诊断流程。
SDN控制器发送的诊断报文中还可以包括IP生命周期(Time To Live，TTL)值，接收到诊断报文的设备判断诊断报文中的IP TTL值，若IP TTL值大于1，则将IP TTL值减1后根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文；若IP TTL值小于或等于1，则向SDN控制器上送诊断报文。IP TTL值是SDN控制器根据路径诊断需求确定的值，用于控制诊断报文的最大发送路径长度，可以避免诊断报文发送到目的主机而对业务系统造成影响。每当诊断 报文经过一次转发，转发诊断报文的设备将IP TTL值减1，当诊断报文中的IP TTL值小于或等于1时，接收到诊断报文的设备将停止转发该诊断报文。这样可以针对不同规模的混合overlay网络进行针对性的路径诊断配置。另外，IP TTL也用于体现诊断报文的路径信息，SDN控制器可以根据接收到诊断报文的设备上送的诊断报文中的IP TTL值确定诊断报文在混合overlay网络中的转发路径，根据转发路径和混合overlay网络的拓扑图，确定混合overlay网络的路径诊断结果。
SDN控制器根据尾节点设备是否有收到并上送诊断报文来判断是否存在网络路径故障，上送诊断报文中IP TTL最小的交换机节点的出口链路或出口链路的另一端交换机为可能的故障点。同时，可以根据预先导入的交换机组网拓扑，绘制期望的转发路径与实际诊断得到的路径，将两种路径进行可视化的呈现和对比，以便更精准地判断是转发路径错误还是网络节点故障。
混合overlay网络中的设备可以分为与SDN控制器直接连接的设备和未与SDN控制器直接连接的设备，将与SDN控制器直接连接的设备称为首节点设备。首节点设备与SDN控制器通过本地直连端口连接。那么若接收到诊断报文的设备确定诊断报文的转发出端口为本地直连端口，则该设备根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文。而若接收到诊断报文的设备确定诊断报文的转发出端口为VXLAN隧道端口，则将诊断报文进行VXLAN封装后根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文。SDN控制器可以统一采用OpenFlow的packet-out方式下发原始诊断报文到首节点设备。对于OpenFlow域交换机，指定输出(output)的出端口为流水线OFPP_TABLE(0xfffffff9)；对于EVPN域交换机，指定出端口是OFPP_NORMAL(0xfffffffa)。首节点设备，是业务流量进入SDN混合overlay网络的第一个VTEP接入交换机，可以是OpenFlow域交换机，也可以是EVPN域交换机。
首节点设备接收到SDN控制器packet-out下发的原始诊断报文，根据指定的入端口和原始诊断报文的IP、MAC，查找MAC转发表和IP路由表，转发出口可能是本地直连端口，也可能是VXLAN隧道端口。如果转发出口是本地直连端口，则直接将原始诊断报文送出口；如果转发出口是VXLAN隧道端口，则将原始诊断报文进行VXLAN封装后送隧道端口对应的物理出口。在出端口，匹配诊断流特征(IP DSCP或报文净荷字节码)，转发并上送一份报文到SDN控制器，上送时携带报文入端口和出端口信息。网络中非首节点设备(OpenFlow交换机、EVPN交换机、underlay交换机)，对诊断报文的查询业务转发表项进行转发，同时在出端口匹配诊断流特征转发并上送一份报文到SDN控制器。查表转发，查询IP路由表、地址解析协议/邻居发现(Address Resolution Protocol/Neighbor Discovery，ARP/ND)表、MAC转发表，得到出端口；对于 非首节点设备，是从业务网口收包后，与正常业务一样查表转发。多个设备在转发诊断报文时对IP TTL和IP DSCP值进行相应的处理。转发并上送诊断报文，对OpenFlow域交换机是匹配OpenFlow流表，动作是发送诊断报文到出端口并上送诊断报文到SDN控制器，上送诊断报文到SDN控制器是通过OpenFlow通道的packet-in消息；对于EVPN域交换机和underlay交换机，转发面匹配ACL表项，动作是镜像上送诊断报文到SDN交换机控制面，在SDN交换机的控制面通过OpenFlow通道的packet-in消息上送诊断报文到SDN控制器。IP TTL值的处理，是指VXLAN封装/解封装时的继承、IP路由转发时的减一处理。OpenFlow域或EVPN域的VTEP点交换机，在封装VXLAN隧道时，将诊断报文的IP TTL值继承到VXLAN外层IP首部；在解封装VXLAN时，需将VXLAN外层IP首部的IP TTL值继承到VXLAN内层诊断报文的IP首部；在OpenFlow域、EVPN域和underlay交换机进行IP路由转发时，首先判断IP首部的TTL是否小于等于1，若IP首部的TTL小于等于1，则设备停止转发，否则对IP TTL值减一后转发。IP DSCP值的处理是指VXLAN封装时的继承，OpenFlow域或EVPN域的VTEP点交换机，在封装VXLAN隧道时，将诊断报文的IP DSCP值继承到VXLAN外层IP首部，便于underlay交换机进行诊断报文的特征匹配。
图5为本申请实施例提供的另一种SDN混合overlay网络中的路径诊断方法的流程图。如图5所示，本实施例提供的SDN混合overlay网络中的路径诊断方法包括：
步骤S510，接收SDN控制器发送的诊断报文，诊断报文与业务报文结构相同，且封装诊断流特征。
步骤S520，根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文，以使SDN控制器根据接收到诊断报文的设备上送的诊断报文确定混合overlay网络的路径诊断结果。
本实施例提供的SDN混合overlay网络中的路径诊断方法应用于SDN混合overlay网络中的设备，其实现方式和技术效果已经在图2至图4所示实施例中进行了说明，此处不再赘述。
图5所示实施例的基础上，接收SDN控制器发送的诊断报文之前，还包括：接收SDN控制器发送的配置信息，配置信息用于指示多个设备根据接收到的诊断报文中的诊断流特征转发并上送接收到的诊断报文。
图5所示实施例的基础上，混合overlay网络中的多个设备包括OpenFlow域交换机、EVPN域交换机、underlay交换机中的至少一种。
图5所示实施例的基础上，接收SDN控制器发送的配置信息，包括：当设 备为OpenFlow域交换机时，接收SDN控制器发送的包括诊断流特征的OpenFlow流表，接收到OpenFlow流表的设备转发并上送接收到的诊断报文，配置信息即OpenFlow流表；当设备为EVPN域交换机或underlay交换机时，接收SDN控制器发送的包括诊断流特征的ACL规则，接收到ACL规则的设备转发并上送接收到的诊断报文，配置信息即ACL规则。
图5所示实施例的基础上，接收SDN控制器发送的配置信息之后，还包括：接收SDN控制器发送的配置删除信息，配置删除信息用于使接收到配置删除信息的设备停止转发和上送接收到的诊断报文。
图5所示实施例的基础上，诊断流特征包括IP DSCP值或报文净荷字节码。
图5所示实施例的基础上，诊断报文与业务报文结构相同，包括：诊断报文的IP五元组、VLAN、MAC与业务报文相同。
图5所示实施例的基础上，根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文，包括：若接收到诊断报文的设备确定诊断报文的转发出端口为本地直连端口，则根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文；若接收到诊断报文的设备确定诊断报文的转发出端口为VXLAN隧道端口，则将诊断报文进行VXLAN封装后根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文。
图5所示实施例的基础上，诊断报文中还包括IP TTL值，根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文，包括：判断诊断报文中的IP TTL值，若IP TTL值大于1，则将IP TTL值减1后根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文；若IP TTL值小于或等于1，则向SDN控制器上送诊断报文。
图6为本申请实施例提供的另一种SDN混合overlay网络中的路径诊断方法的流程图。图6为overlay网络中的首节点设备接收到诊断报文的处理流程图，如图6所示，本实施例提供的SDN混合overlay网络中的路径诊断方法包括如下步骤。
步骤S600，接收到SDN控制器下发的诊断报文。
步骤S610，判断本节点是否为OpenFlow交换机，若本节点为OpenFlow交换机，则执行步骤S620，否则执行步骤S660。
步骤S620，执行Output到OFPP_TABLE流水线，查流表正常转发。
步骤S630，如果查路由表，则IP TTL减1。
步骤S640，出口流表匹配IP DSCP，复制诊断报文Packet-in上送SDN控 制器。
步骤S650，出口对诊断报文进行VXLAN封装，继承IP TTL和IP DSCP。
步骤S660，根据携带的动作(ACTION)判断是诊断报文，查软件表转发。
步骤S670，如果查IP路由表，则IP TTL减1。
步骤S680，出口ACL匹配IP DSCP或特征字节码，复制诊断报文Packet-in上送SDN控制器。
步骤S690，出口对诊断报文进行VXLAN封装，继承IP TTL和IP DSCP。
图7为本申请实施例提供的另一种SDN混合overlay网络中的路径诊断方法的流程图。图7为overlay网络中的非首节点设备接收到诊断报文的处理流程图，如图7所示，本实施例提供的SDN混合overlay网络中的路径诊断方法包括如下步骤。
步骤S700，端口接收到诊断报文。
步骤S710，判断本节点是否为VTEP交换机，若本节点为VTEP交换机，则执行步骤S720，否则执行步骤S770。
步骤S720，解封装VXLAN，IP TTL继承到内层，转发面查表转发。
步骤S730，如果查路由表，则IP TTL减1。
步骤S740，查ACL或流表匹配IP DSCP或特征字节码，复制诊断报文Packet-in上送SDN控制器。
步骤S750，判断IP TTL是否小于或等于1，若IP TTL小于或等于1，则停止转发诊断报文，否则执行步骤S760。
步骤S760，从出端口发送诊断报文，如果出口为隧道，对诊断报文进行VXLAN封装，继承IP TTL和IP DSCP。
步骤S770，对VXLAN封装的诊断报文转发面查表转发。
步骤S780，如果查IP路由表，则IP TTL减1。
步骤S790，出口ACL匹配IP DSCP或特征字节码，复制诊断报文Packet-in上送SDN控制器。
本申请实施例提供的SDN混合overlay网络中的路径诊断方法，采用OpenFlow的packet-out和packet-in作为控制通道，模拟业务流量进行诊断和IP转发，通过IP DSCP等特征码标识诊断报文，采用TTL反映VXLAN overlay和underlay的转发路径节点的路径信息及故障点，解决了混合overlay SDN网络中业务转发路径的故障诊断问题。在SDN控制器的管控下，使得OpenFlow设备、 EVPN设备和underlay设备能采用统一的诊断方法，仿真业务流量，实现端到端的路径故障发现和呈现。
需要说明的是，网络中存在不支持该诊断技术的第三方underlay设备时，也能使用本技术方案及系统进行路径诊断。本申请的使用场景不仅限于混合overlay网络，对于非混合overlay网络，例如单一的纯OpenFlow SDN，或者纯EVPN SDN，甚至是非overlay的普通IP网络，也同样适用。
图8为本申请实施例提供的一种SDN混合overlay网络中的路径诊断系统的结构示意图。本实施例提供的SDN混合overlay网络中的路径诊断系统包括：设置于SDN控制器中的控制器诊断处理单元81和设置于混合overlay网络中的多个设备中的网络设备诊断处理单元82。
控制器诊断处理单元81被设置为向混合overlay网络中的多个设备中的网络设备诊断处理单元82发送诊断报文，诊断报文与业务报文结构相同，且封装诊断流特征；网络设备诊断处理单元82被设置为根据诊断流特征转发诊断报文并向控制器诊断处理单元81上送诊断报文；控制器诊断处理单元81还被设置为根据接收到诊断报文的设备中的网络设备诊断处理单元82上送的诊断报文确定混合overlay网络的路径诊断结果。
网络设备诊断处理单元82可以包括OpenFlow诊断处理单元、EVPN诊断处理单元、underlay诊断处理单元。设置于OpenFlo域交换机中的网络设备诊断处理单元82为OpenFlow诊断处理单元、设置于EVPN域交换机中的网络设备诊断处理单元82为EVPN诊断处理单元、设置于underlay交换机中的网络设备诊断处理单元82为underlay诊断处理单元。
OpenFlow诊断处理单元位于OpenFlow域交换机(一般为vSwitch)内部，被配置为接收SDN控制器下发的诊断特征匹配流表，生成流表流水线；诊断开始时，如果OpenFlow诊断处理单元作为首节点接收到SDN控制器下发的诊断报文，则按照流表流水线执行查表处理；OpenFlow诊断处理单元作为非首节点接收到转发面端口的报文时，也按照流表流水线执行查表处理，包括VXLAN封装和解封装，当报文匹配到诊断特征流表时，根据action动作，转发并packet-in上送该报文。在VXLAN转发该报文时，支持IP TTL值的继承处理。
EVPN诊断处理单元位于EVPN域交换机内部，被配置为接收SDN控制器下发的诊断特征匹配配置，生成ACL镜像规则并下发转发面。诊断开始时，如果EVPN诊断处理单元作为首节点接收到SDN控制器下发的诊断报文，则在控制面执行查表处理；EVPN诊断处理单元作为非首节点，转发面ACL匹配到诊断报文时，镜像上送诊断报文到SDN控制面，由SDN控制面的诊断处理单元通过OpenFlow的packet-in上送诊断报文到SDN控制器；在VXLAN转发诊断 报文时，支持IP TTL值的继承处理。
underlay诊断处理单元位于underlay交换机内部，被配置为接收SDN控制器下发的诊断特征匹配配置，生成ACL镜像规则并下发转发面。当转发面ACL匹配到诊断报文时，镜像上送诊断报文到SDN控制面，由SDN控制面的诊断处理单元通过OpenFlow的packet-in上送诊断报文到SDN控制器。
本申请实施例还提供一种包含计算机可执行指令的存储介质，计算机可执行指令在由计算机处理器执行时用于执行一种SDN混合overlay网络中的路径诊断方法，该方法包括：向混合overlay网络中的多个设备发送诊断报文，诊断报文与业务报文结构相同，且封装诊断流特征，诊断报文用于使接收到诊断报文的设备根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文；根据接收到诊断报文的设备上送的诊断报文确定混合overlay网络的路径诊断结果。
本申请实施例还提供一种包含计算机可执行指令的存储介质，计算机可执行指令在由计算机处理器执行时用于执行一种SDN混合overlay网络中的路径诊断方法，该方法包括：接收SDN控制器发送的诊断报文，诊断报文与业务报文结构相同，且封装诊断流特征；根据诊断流特征转发诊断报文并向SDN控制器上送诊断报文，以使SDN控制器根据接收到诊断报文的设备上送的诊断报文确定混合overlay网络的路径诊断结果。
一般来说，本申请的多种实施例可以在硬件或专用电路、软件、逻辑或其任何组合中实现。例如，一些方面可以被实现在硬件中，而其它方面可以被实现在控制器、微处理器或其它计算装置执行的固件或软件中，尽管本申请不限于此。
本申请的实施例可以通过移动装置的数据处理器执行计算机程序指令来实现，例如在处理器实体中，或者通过硬件，或者通过软件和硬件的组合。计算机程序指令可以是汇编指令、指令集架构(Instruction Set Architecture，ISA)指令、机器指令、机器相关指令、微代码、固件指令、状态设置数据、或者以一种或多种编程语言的任意组合编写的源代码或目标代码。
本申请附图中的任何逻辑流程的框图可以表示程序步骤，或者可以表示相互连接的逻辑电路、模块和功能，或者可以表示程序步骤与逻辑电路、模块和功能的组合。计算机程序可以存储在存储器上。存储器可以具有任何适合于本地技术环境的类型并且可以使用任何适合的数据存储技术实现，例如但不限于只读存储器(Read-Only Memory，ROM)、随机访问存储器(Random Access Memory，RAM)、光存储器装置和系统(数码多功能光碟(Digital Video Disc，DVD)或光盘((Compact Disc，CD))等。计算机可读介质可以包括非瞬时性存储介质。数据处理器可以是任何适合于本地技术环境的类型，例如但不限 于通用计算机、专用计算机、微处理器、数字信号处理器(Digital Signal Processing，DSP)、专用集成电路(Application Specific Integrated Circuit，SAIC)、可编程逻辑器件(Field-Programmable Gate Array，FPGA)以及基于多核处理器架构的处理器。

Claims (22)

  1. 一种软件定义网络SDN混合二层overlay网络中的路径诊断方法，应用于SDN控制器，包括：
    向混合overlay网络中的多个设备发送诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征，所述诊断报文用于使接收到所述诊断报文的设备根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文；
    根据所述接收到所述诊断报文的设备上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。
  2. 根据权利要求1所述的方法，所述向混合overlay网络中的多个设备发送诊断报文之前，还包括：
    向所述混合overlay网络中的多个设备发送配置信息，所述配置信息用于指示所述多个设备根据接收到的所述诊断报文中的诊断流特征转发并上送所述接收到的所述诊断报文。
  3. 根据权利要求2所述的方法，其中，所述混合overlay网络中的多个设备包括OpenFlow域交换机、以太网虚拟专用网络EVPN域交换机、底层underlay交换机中的至少一种。
  4. 根据权利要求3所述的方法，其中，所述向所述混合overlay网络中的多个设备发送配置信息，包括：
    在所述多个设备为OpenFlow域交换机的情况下，向所述多个设备发送包括所述诊断流特征的OpenFlow流表，接收到所述OpenFlow流表的设备转发并上送所述接收到的诊断报文；
    在所述多个设备为EVPN域交换机或underlay交换机的情况下，向所述多个设备发送包括所述诊断流特征的访问控制列表ACL规则，接收到所述ACL规则的设备转发并上送所述接收到的诊断报文。
  5. 根据权利要求2～4任一项所述的方法，所述确定所述混合overlay网络的路径诊断结果之后，还包括：
    向所述多个设备发送配置删除信息，所述配置删除信息用于使接收到所述配置删除信息的设备停止转发和上送所述接收到的所述诊断报文。
  6. 根据权利要求1～4任一项所述的方法，其中，所述诊断流特征包括网络协议差分服务代码点IP DSCP值或报文净荷字节码。
  7. 根据权利要求1～4任一项所述的方法，其中，所述诊断报文与业务报文结构相同，包括：
    所述诊断报文的IP五元组、虚拟局域网VLAN、介质访问控制MAC与业务报文相同。
  8. 根据权利要求1～4任一项所述的方法，其中，所述诊断报文中还包括IP生命周期TTL值，所述IP TTL值用于使所述接收到所述诊断报文的设备判断所述诊断报文中的IP TTL值，在所述IP TTL值大于1的情况下，将所述IP TTL值减1后根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文；在所述IP TTL值小于或等于1的情况下，向所述SDN控制器上送所述诊断报文。
  9. 根据权利要求8所述的方法，其中，所述根据所述接收到所述诊断报文的设备上送的所述诊断报文确定所述混合overlay网络的路径诊断结果，包括：
    根据所述接收到所述诊断报文的设备上送的所述诊断报文中的IP TTL值确定所述诊断报文在所述混合overlay网络中的转发路径，根据所述转发路径和所述混合overlay网络的拓扑图，确定所述混合overlay网络的路径诊断结果。
  10. 一种软件定义网络SDN混合二层overlay网络中的路径诊断方法，应用于所述SDN混合overlay网络中的设备，包括：
    接收SDN控制器发送的诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征；
    根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文，以使所述SDN控制器根据接收到所述诊断报文的设备上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。
  11. 根据权利要求10所述的方法，所述接收SDN控制器发送的诊断报文之前，还包括：
    接收所述SDN控制器发送的配置信息，所述配置信息用于指示所述设备根据接收到的所述诊断报文中的诊断流特征转发并上送接收到的所述诊断报文。
  12. 根据权利要求11所述的方法，其中，所述混合overlay网络中的设备包括OpenFlow域交换机、以太网虚拟专用网络EVPN域交换机、底层underlay交换机中的至少一种。
  13. 根据权利要求12所述的方法，其中，所述接收所述SDN控制器发送的配置信息，包括：
    在所述设备为OpenFlow域交换机的情况下，接收所述SDN控制器发送的包括所述诊断流特征的OpenFlow流表，接收到所述OpenFlow流表的设备转发并上送所述接收到的诊断报文；
    在所述设备为EVPN域交换机或underlay交换机的情况下，接收所述SDN控制器发送的包括所述诊断流特征的访问控制列表ACL规则，接收到所述ACL规则的设备转发并上送所述接收到的诊断报文。
  14. 根据权利要求11～13任一项所述的方法，所述接收所述SDN控制器发送的配置信息之后，还包括：
    接收所述SDN控制器发送的配置删除信息，所述配置删除信息用于使接收到所述配置删除信息的设备停止转发和上送接收到的所述诊断报文。
  15. 根据权利要求10～13任一项所述的方法，其中，所述诊断流特征包括网络协议差分服务代码点IP DSCP值或报文净荷字节码。
  16. 根据权利要求10～13任一项所述的方法，其中，所述诊断报文与业务报文结构相同，包括：
    所述诊断报文的IP五元组、虚拟局域网VLAN、介质访问控制MAC与业务报文相同。
  17. 根据权利要求10～13任一项所述的方法，其中，所述根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文，包括：
    在接收到所述诊断报文的设备确定所述诊断报文的转发出端口为本地直连端口的情况下，根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文；
    在接收到所述诊断报文的设备确定所述诊断报文的转发出端口为虚拟扩展局域网VXLAN隧道端口的情况下，将所述诊断报文进行VXLAN封装后根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文。
  18. 根据权利要求10～13任一项所述的方法，其中，所述诊断报文中还包括IP生命周期TTL值，所述根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文，包括：判断所述诊断报文中的IP TTL值，在所述IP TTL值大于1的情况下，将所述IP TTL值减1后根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文；在所述IP TTL值小于或等于1的情况下，向所述SDN控制器上送所述诊断报文。
  19. 一种软件定义网络SDN混合二层overlay网络中的路径诊断装置，包括：
    发送模块，设置为向混合overlay网络中的多个设备发送诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征，所述诊断报文用于使接收到所述诊断报文的设备根据所述诊断流特征转发所述诊断报文并向所述SDN控制 器上送所述诊断报文；
    诊断模块，设置为根据接收到所述诊断报文的设备上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。
  20. 一种软件定义网络SDN混合二层overlay网络中的路径诊断装置，包括：
    接收模块，设置为接收SDN控制器发送的诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征；
    发送模块，设置为根据所述诊断流特征转发所述诊断报文并向所述SDN控制器上送所述诊断报文，以使所述SDN控制器根据接收到所述诊断报文的设备上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。
  21. 一种软件定义网络SDN混合二层overlay网络中的路径诊断系统，包括：设置于SDN控制器中的控制器诊断处理单元和设置于混合overlay网络中的多个设备的网络设备诊断处理单元；
    所述控制器诊断处理单元被设置为向所述混合overlay网络中的多个设备中的网络设备诊断处理单元发送诊断报文，所述诊断报文与业务报文结构相同，且封装诊断流特征；
    所述网络设备诊断处理单元被设置为根据所述诊断流特征转发所述诊断报文并向所述控制器诊断处理单元上送所述诊断报文；
    所述控制器诊断处理单元还被设置为根据接收到所述诊断报文的设备中的网络设备诊断处理单元上送的所述诊断报文确定所述混合overlay网络的路径诊断结果。
  22. 一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1～18任一项的SDN混合overlay网络中的路径诊断方法。
PCT/CN2022/098855 2021-06-30 2022-06-15 SDN混合overlay网络中的路径诊断方法和系统 WO2023273883A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110736339.8A CN115567377A (zh) 2021-06-30 2021-06-30 SDN混合overlay网络中的路径诊断方法和系统
CN202110736339.8 2021-06-30

Publications (1)

Publication Number Publication Date
WO2023273883A1 true WO2023273883A1 (zh) 2023-01-05

Family

ID=84692538

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/098855 WO2023273883A1 (zh) 2021-06-30 2022-06-15 SDN混合overlay网络中的路径诊断方法和系统

Country Status (2)

Country Link
CN (1) CN115567377A (zh)
WO (1) WO2023273883A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116112419A (zh) * 2023-04-17 2023-05-12 中国兵器科学研究院 一种网络节点、通信方法及系统

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160014007A1 (en) * 2013-02-21 2016-01-14 Nec Europe Ltd. Securing internet measurements using openflow
CN108075936A (zh) * 2016-11-16 2018-05-25 中国移动通信有限公司研究院 VxLAN探测方法及装置
CN108881064A (zh) * 2018-06-26 2018-11-23 新华三技术有限公司 报文信息获取方法和发送方法
CN109245957A (zh) * 2017-07-10 2019-01-18 中兴通讯股份有限公司 网络健康度的检测方法及装置
CN109379241A (zh) * 2018-12-27 2019-02-22 新华三技术有限公司 一种路径信息确定方法及装置
US20200036552A1 (en) * 2018-07-24 2020-01-30 Nicira, Inc. Multicast packet handling in software-defined networking (sdn) environments
CN112769632A (zh) * 2020-11-30 2021-05-07 锐捷网络股份有限公司 一种数据中心网络故障检测的方法和系统

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160014007A1 (en) * 2013-02-21 2016-01-14 Nec Europe Ltd. Securing internet measurements using openflow
CN108075936A (zh) * 2016-11-16 2018-05-25 中国移动通信有限公司研究院 VxLAN探测方法及装置
CN109245957A (zh) * 2017-07-10 2019-01-18 中兴通讯股份有限公司 网络健康度的检测方法及装置
CN108881064A (zh) * 2018-06-26 2018-11-23 新华三技术有限公司 报文信息获取方法和发送方法
US20200036552A1 (en) * 2018-07-24 2020-01-30 Nicira, Inc. Multicast packet handling in software-defined networking (sdn) environments
CN109379241A (zh) * 2018-12-27 2019-02-22 新华三技术有限公司 一种路径信息确定方法及装置
CN112769632A (zh) * 2020-11-30 2021-05-07 锐捷网络股份有限公司 一种数据中心网络故障检测的方法和系统

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116112419A (zh) * 2023-04-17 2023-05-12 中国兵器科学研究院 一种网络节点、通信方法及系统
CN116112419B (zh) * 2023-04-17 2023-09-05 中国兵器科学研究院 一种网络节点、通信方法及系统

Also Published As

Publication number Publication date
CN115567377A (zh) 2023-01-03

Similar Documents

Publication Publication Date Title
CN110971433B (zh) 获取SRv6隧道信息的方法、设备和系统
US11799773B2 (en) EVPN packet processing method, device, and system
CN111886833B (zh) 重定向控制信道消息的方法和用于实现该方法的设备
US11979322B2 (en) Method and apparatus for providing service for traffic flow
US9246799B2 (en) Data plane learning of bi-directional service chains
US20230344754A1 (en) Message indication method and apparatus, and device and storage medium
US11924099B2 (en) Method for forwarding packet in hybrid network, device, and system
US20230300070A1 (en) Packet Sending Method, Device, and System
US20230067091A1 (en) Method and device for segment routing service processing, routing equipment, and storage medium
US11522792B2 (en) Method for discovering forwarding path and related device thereof
CN111614505B (zh) 报文处理的方法和网关设备
US11956148B2 (en) Packet transmission method and device
US20220368638A1 (en) Systems and methods for scalable validation of multiple paths in a network using segment routing
US20240129223A1 (en) Systems and methods for data plane validation of multiple paths in a network
US20240048479A1 (en) Packet Forwarding Method and Apparatus, Network Device, and Storage Medium
WO2023273883A1 (zh) SDN混合overlay网络中的路径诊断方法和系统
CN108282404B (zh) 一种路由生成方法、装置及系统
US20240056389A1 (en) Information processing method, and device and storage medium
WO2022053007A1 (zh) 网络可达性验证方法及装置、计算机存储介质
US20240031266A1 (en) Remote reachability checks in a distributed tunnel fabric
CN113347101B (zh) 一种路由信息的发送控制方法、vtep及计算机可读存储介质
US20230336458A1 (en) Route Transmission Method and Apparatus
US20240187346A1 (en) Systems and methods for scalable validation of multiple paths in a network using segment routing
CN114598636A (zh) 流量调度方法、设备及系统
CN115665043A (zh) 数据报文转发方法、vtep、装置、介质及系统

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: 22831702

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE