WO2022257854A1 - 一种报文发布方法、转发路径处理方法及装置 - Google Patents

一种报文发布方法、转发路径处理方法及装置 Download PDF

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Publication number
WO2022257854A1
WO2022257854A1 PCT/CN2022/096873 CN2022096873W WO2022257854A1 WO 2022257854 A1 WO2022257854 A1 WO 2022257854A1 CN 2022096873 W CN2022096873 W CN 2022096873W WO 2022257854 A1 WO2022257854 A1 WO 2022257854A1
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Prior art keywords
network
slice
identifier
message
network interface
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PCT/CN2022/096873
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English (en)
French (fr)
Inventor
徐国其
胡志波
刘国权
郑娟
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华为技术有限公司
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Publication of WO2022257854A1 publication Critical patent/WO2022257854A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery

Definitions

  • the present application relates to the communication field, and in particular to a method for publishing a message, a method and a device for processing a forwarding path.
  • Network slicing is essentially to divide the operator's physical network into multiple virtual networks, and each virtual network is divided according to different service requirements, such as delay, bandwidth, security and reliability, etc. To deal with different network application scenarios.
  • the forwarding path of the virtual network is generated according to the network slice, and the forwarding path is used to forward the message, so as to meet the service requirements of the business on the network slice.
  • a network device periodically sends information about the network slice configured by its network interface to other devices, so that other devices know the information and perform corresponding processing.
  • this method consumes a lot of network resources and has low efficiency.
  • the embodiment of the present application provides a method for publishing a message, a method and a device for processing a forwarding path, which are used to save network resources and improve processing efficiency.
  • a method for publishing a message which is applied to a first network device, and the method includes the following steps: the first network device acquires status information of a network interface, such as whether the network interface is configured with a corresponding network slice, network Whether the interface is faulty, etc. In response to a change in the state information of the network interface, the first network device generates a first message, where the first message carries the identifier of the network interface, changed state information, and the information of the first network slice. Slice ID. Wherein, the changed state information indicates the changed state of the network interface belonging to the first network slice. The first network device publishes the first packet.
  • this embodiment of the present application only publishes the changed status information of the network interface carrying the network interface when the status information of the network interface of the first network device changes.
  • State information, the identifier of the network interface, and the first message corresponding to the slice identifier of the first network slice reduce the number of message releases, and do not need to wait until the end of the cycle timing to release, which saves the release time and improves the reception of the message.
  • the state information of the network interface may be changed in the following four possible implementation manners, and the step of generating the first packet by the first network device will be introduced below in combination with these four possible implementation manners.
  • Implementation manner 1 in response to newly configuring the first network slice on the network interface, the first network device generates a first packet.
  • Implementation manner 2 In response to the network interface deleting configuration of the first network slice, the first network device generates a first packet.
  • Implementation Mode 3 In response to the network interface changing from a normal state to a fault state, the first network device obtains a slice identifier of the first network slice, and generates a first report according to the slice identifier of the first network slice. arts.
  • Implementation Mode 4 In response to the network interface recovering from the fault state to the normal state, the first network device obtains the slice identifier of the first network slice, and generates a first report according to the slice identifier of the first network slice. arts.
  • the first message is an intermediate system to intermediate system (Intermediate System to Intermediate System, ISIS) message, an open shortest path first (Open Shortest Path First, OSPF) message or a border gateway protocol (Border Gateway Protocol, BGP) message.
  • ISIS Intermediate System to Intermediate System
  • OSPF Open Shortest Path First
  • BGP Border Gateway Protocol
  • the changed state information and the slice identifier of the first network slice are carried in the Layer 2 Bundle Member Attributes (L2 Bundle Member Attributes) type of the ISIS message or the OSPF message In the length value (type length value, TLV) field.
  • L2 Bundle Member Attributes L2 Bundle Member Attributes
  • TLV length value
  • the L2 Bundle Member Attributes TLV field of the ISIS message includes a layer 2 bundle attribute description (L2 Bundle Attribute Descriptors) field, the changed state information and the slice identifier of the first network slice Carried in the L2 Bundle Attribute Descriptors field.
  • L2 Bundle Attribute Descriptors layer 2 bundle attribute description
  • the L2 Bundle Member Attributes TLV field of the OSPF message includes a member link attribute (Member Link attribute) subtype length value (sub-TLV) field, the changed state information and the The slice identifier of the first network slice is carried in the Member Link attribute sub-TLV field.
  • Member Link attribute Member Link attribute
  • sub-TLV subtype length value
  • the changed state information and the slice identifier of the first network slice are carried in the link state (Link-State) network layer reachability information (Network Layer Reachability Information) of the BGP message. , NLRI) field.
  • Link state Link State
  • Network Layer Reachability Information Network Layer Reachability Information
  • the Link-State NLRI field includes a link descriptor (Link Descriptors) field, and the changed state information and the slice identifier of the first network slice are carried in the Link Descriptors field .
  • Link Descriptors link descriptors
  • the first message is used to process the forwarding path according to the changed state information of the network interface, so as to realize the purpose of transmitting the message according to the correct forwarding path.
  • the forwarding path is a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice.
  • the first network device publishing the first message includes: the first network device publishing the first message to a control device or a second network device, so that the control device or has The second network device with path calculation capability processes the forwarding path according to the first packet.
  • the second network device may also be a network device without path calculation capability, so as to realize the purpose of flooding the first packet in the network topology.
  • a forwarding path processing method is provided, which is applied to a target device, and the target device may be a control device or a second network device.
  • the method includes the following steps: the target device receives a first message from the first network device, the first message carries the identifier of the network interface, the changed status information of the network interface, and the first network A slice identifier of a slice, and the changed state information indicates a changed state of the network interface belonging to the first network slice.
  • the target device processes the forwarding path according to the changed state information, where the forwarding path is a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice.
  • the first message is sent when the state information of the network interface changes, compared with the traditional technology, it not only reduces the amount of message sending, but also does not need to wait until the end of the period to send the message, which improves the processing of the target device on the forwarding path. efficiency.
  • the target device can process the forwarding path in a timely manner according to the changed state information, reducing the possibility of transmitting packets according to the wrong forwarding path and ensuring the reliability of the network.
  • the target device processes the forwarding path according to the changed state information, and the processing methods are different according to different state information:
  • instructing the network interface to delete and configure the first network slice in response to the changed state information or instructing the network interface to change from the normal state to the normal state in response to the changed state information
  • the target device searches for path information of a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice.
  • the target device deletes the path information of the forwarding path or invalidates the path information of the forwarding path, so as to avoid continuing to use a wrong forwarding path.
  • the target device recalculates the forwarding path corresponding to the slice identifier of the first network slice according to network interfaces other than the network interface belonging to the first network slice, so as to ensure that the correct forwarding path is used for message transmission.
  • the target device in response to the changed state information instructing the network interface to newly configure the first network slice, the target device generates an identifier of the network interface and the first network slice.
  • the slice identifier of the network slice corresponds to a forwarding path, so as to transmit the packet corresponding to the first network slice through the forwarding path.
  • the target device stores the correspondence between the identifier of the network interface, the slice identifier of the first network slice, and the path information of the forwarding path, so that the subsequent target device can perform corresponding processing according to the corresponding relationship, for example, sending a report to the first network slice.
  • a network device issues the corresponding relationship, so that the first network device generates a routing table and a forwarding table for forwarding packets according to the path information of the forwarding path.
  • the target device deletes the forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice when the network interface is in a fault state, then in response to the change The subsequent state information indicates that the network interface recovers from the fault state to the normal state, and the target device generates a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice, or, the target device Setting as valid the forwarding information of the forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice, so as to transmit the packet corresponding to the first network slice through the forwarding path.
  • the target device stores the correspondence between the identifier of the network interface, the slice identifier of the first network slice, and the path information of the forwarding path.
  • the changed status information and the position carried in the first packet of the slice identifier of the first network slice please refer to the above, and details will not be repeated here.
  • a device for publishing a message which is applied to a first network device, and the device includes: a processing unit, configured to acquire status information of a network interface; and the processing unit, configured to respond to the network interface
  • the state information of the interface changes, and a first message is generated, the first message carries the identifier of the network interface, the changed state information, and the slice identifier of the first network slice, and the changed state information indicates A changed state of the network interface belonging to the first network slice;
  • a sending unit configured to publish the first message.
  • the processing unit in response to a change in the state information of the network interface, the processing unit generates a first message, including: in response to the network interface deleting and configuring the first network slice, the processing unit Generating a first packet; or, in response to newly configuring the first network slice on the network interface, the processing unit generates the first packet.
  • the processing unit in response to the state information of the network interface changing, the processing unit generates the first message, including: in response to the network interface changing from a normal state to a fault state, the processing unit obtains A slice identifier of the first network slice, and generating a first message according to the slice identifier of the first network slice.
  • the processing unit in response to changes in the state information of the network interface, the processing unit generates the first message, including: in response to the network interface recovering from a fault state to a normal state, the processing unit obtains A slice identifier of the first network slice, and generating a first message according to the slice identifier of the first network slice.
  • the first message is used to process the forwarding path according to the changed state information of the network interface, and the forwarding path is the identifier of the network interface and the first network The slice ID of the slice corresponds to the forwarding path.
  • the sending unit is configured to publish the first message to a control device or a second network device.
  • a forwarding path processing device which is applied to a target device, and the device includes: a receiving unit, configured to receive a first message from a first network device, and the first message carries the An identifier of a network interface, changed state information of the network interface, and a slice identifier of a first network slice, where the changed state information indicates a changed state of the network interface belonging to the first network slice; A processing unit, configured to process a forwarding path according to the changed state information, where the forwarding path is a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice.
  • the processing unit is configured to, in response to the changed state information, instruct the network interface to delete and configure the first network slice, or, in response to the changed state information, instruct the
  • the network interface changes from a normal state to a fault state, and search for path information of a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice; the processing unit is further configured to delete the forwarding path or invalidate the path information of the forwarding path; or, recalculate the slice identifier corresponding to the first network slice according to other network interfaces belonging to the first network slice except the network interface forwarding path.
  • the processing unit is configured to, in response to the changed state information instructing the network interface to newly configure the first network slice, generate an identifier of the network interface and the first network slice.
  • a forwarding path corresponding to a slice identifier of a network slice is stored, and a corresponding relationship between the identifier of the network interface, the slice identifier of the first network slice, and the path information of the forwarding path is stored.
  • the processing unit is configured to, in response to the changed state information indicating that the network interface recovers from a fault state to a normal state, generate an identifier of the network interface and the first network interface
  • the forwarding path corresponding to the slice identifier of the slice and storing the corresponding relationship between the identifier of the network interface, the slice identifier of the first network slice, and the path information of the forwarding path;
  • the forwarding information identifying the forwarding path corresponding to the slice identifier of the first network slice is made valid.
  • the target device is a control device or a second network device.
  • a network device in a fifth aspect, includes a processor chip and a memory, the memory is used to store instructions or program codes, and the processor chip is used to call and run the instructions or program codes from the memory, to Execute the message publishing method described in the first aspect.
  • a device in a sixth aspect, includes a processor chip and a memory, the memory is used to store instructions or program codes, and the processor chip is used to call and run the instructions or program codes from the memory to perform the following steps: The forwarding path processing method described in the second aspect.
  • a computer-readable storage medium including instructions, programs or codes, which, when executed on a computer, cause the computer to execute the method for publishing a message as described in the first aspect or the method as described in the second aspect The forwarding path processing method.
  • FIG. 1 is a schematic structural diagram of a network system provided by an embodiment of the present application.
  • FIG. 2 is a flow chart of a forwarding path processing method provided in an embodiment of the present application
  • FIG. 3 is a schematic diagram of the format of the TLV field or sub-TLV field provided by the embodiment of the present application;
  • Fig. 4 is the schematic diagram of the format of the L2 Bundle Attribute Descriptors field of the ISIS message that the embodiment of the present application provides;
  • Fig. 6 is the schematic diagram of the format of the Link-State NLRI field of the BGP message that the embodiment of the present application provides;
  • FIG. 8 is a schematic structural diagram of a forwarding path processing device 800 provided in an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a device 900 provided in an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a device 1000 provided in an embodiment of the present application.
  • the network device periodically sends the network slice information of the network interface configuration of the network device to other devices. Specifically, the network device periodically sends a message to other devices, and the message carries the identifier of each network interface of one or more network interfaces of the network device, and the identifier of the network slice configured for the network interface . If a network interface of the network device is not configured with a network slice, the packet does not include the identifier of the network slice corresponding to the network interface. If a network interface fails, the packet does not include the identifier of the network interface and the identifier of the corresponding network slice.
  • network device A includes network interface 1, network interface 2, and network interface 3, wherein network interface 1 is configured with network slice 1, network interface 2 is configured with network slice 2, and network interface 3 is not configured with network slice. Then, in the message sent by network device A to other devices, the identifier of network interface 1, the identifier of network slice 1, the identifier of network interface 2, the identifier of network slice 2, and the identifier of network interface 3 are included. If network interface 1 fails, network device A includes the identifier of network interface 2, the identifier of network slice 2, and the identifier of network interface 3 in the message sent to other devices.
  • the method of periodic reporting will cause a waste of transmission resources on the one hand, and on the other hand, it will also cause other devices to process the message. cause waste of processing resources.
  • the state of the network interface changes within a reporting period, the message also needs to be reported at the end of the period, which affects the efficiency of other devices in obtaining and processing the information in the message.
  • embodiments of the present application provide a forwarding path processing method and device, which are used to save network resources and improve processing efficiency.
  • the forwarding path processing method provided in the embodiment of the present application may be applied to the network system shown in FIG. 1 , for example.
  • the network system includes a network device 101 , a network device 102 , a network device 103 , a network device 104 and a control device 201 .
  • the network device 101 is connected with the network device 102 and the network device 103 respectively
  • the network device 102 and the network device 103 are connected with the network device 104
  • the control device 201 is respectively connected with the network device 101, the network device 102, the network device 103 and the network device 104 connect.
  • the network device 101, the network device 102, the network device 103, and the network device 104 may be, for example, physical devices supporting routing functions such as routers and switches, or servers deploying virtual routers or virtual switches.
  • a neighbor relationship may be established among the network device 101, the network device 102, the network device 103, and the network device 104 based on an Interior Gateway Protocol (Interior Gateway Protocol, IGP).
  • IGP Interior Gateway Protocol
  • the control device 201 may be, for example, a network control unit (Net Control Element, NCE) or the like.
  • NCE Network Control Element
  • the control device 201, the network device 101, and the network device 104 may establish a neighbor relationship through a border gateway protocol (Border Gateway Protocol, BGP).
  • BGP Border Gateway Protocol
  • FIG. 2 the figure is a flow chart of a forwarding path processing method provided by an embodiment of the present application.
  • the forwarding path processing method includes the following steps:
  • the first network device acquires state information of a network interface.
  • the first network device may be, for example, network device 101, network device 102, network device 103, or network device 104 in FIG. 1 .
  • the first network device may have one or more network interfaces, and the network interfaces may be physical interfaces or virtual interfaces (or sub-interfaces).
  • the first network device acquires status information of the network interface, where the status information indicates the status of the network interface. For example, whether the network interface is configured with a corresponding network slice, whether the network interface fails, and so on. Among them, one network interface can be configured with one or more network slices. Failure of a network interface can be a failure at the physical level or a failure at the protocol level. No matter which layer fails, the network interface cannot receive or send packets.
  • the first network device when the first network device confirms that the status information of the network interface has changed, the first network device may generate the first report according to the identifier of the network interface, the changed status information, and the slice identifier of the first network slice. , wherein the changed state information indicates a changed state of the network interface belonging to the first network slice.
  • the state information of the network interface may change in the following scenarios, and the information carried in the first packet will be introduced below in combination with these scenarios.
  • Scenario 1 The first network slice is configured on a new network interface.
  • the status information of the network interface obtained by the first network device is that the network interface is not configured with the first network slice (see the following for the process of checking out the unconfigured network slice, here No longer). Then, adding an action of configuring the first network slice on the network interface may trigger generation of the first packet.
  • the first message carries the identifier of the network interface, the slice identifier of the first network slice, and the changed state information of the network interface, where the changed state information indicates that the first network slice is newly added for the network interface Configured network slices.
  • the first packet may only carry the identifier of the first network slice instead of the identifiers of other network slices, so as to save network resources.
  • Scenario 2 Delete the network interface and configure the first network slice.
  • the state information of the network interface acquired by the first network device configures the first network slice for the network interface.
  • the action of the network device to delete the configuration of the first network slice may trigger the generation of the first packet.
  • the first message carries the identifier of the network interface, the slice identifier of the first network slice, and the changed status information of the network interface, where the changed status information instructs the network interface to delete and configure the first network slice .
  • Scenario 3 The network interface changes from a normal state to a faulty state.
  • the state information of the network interface obtained by the first network device is that the network interface is in a normal state, that is, it can receive packets or send packets.
  • the first network device acquires the slice identifier of the first network slice configured for the network interface, and triggers generation of the first packet.
  • the first packet carries the identifier of the network interface, the slice identifier of the first network slice, and changed state information of the network interface, where the changed state information indicates that the network interface fails.
  • the first packet can also carry the identifiers of other network slices to inform the device receiving the first packet that the network interface fails, so Packets corresponding to these network slices cannot be transmitted.
  • Scenario 4 The network interface recovers from a faulty state to a normal state.
  • the state information of the network interface obtained by the first network device indicates that the network interface is in a fault state.
  • the first network device obtains the slice identifier of the first network slice previously configured for the network interface, and triggers the generation of the first packet.
  • the first packet carries the identifier of the network interface, the slice identifier of the first network slice, and changed state information of the network interface, wherein the changed state information indicates that the network interface returns to a normal state.
  • the first message can also carry the identifiers of other network slices to inform the device receiving the first message that the network interface has returned to a normal state , so packets corresponding to these network slices can be transmitted.
  • the first packet may carry the interface identifier of each network interface among the multiple network interfaces, and the interface identifier corresponding to the interface identifier.
  • the changed state information and the slice identifier of the first network slice corresponding to the interface identifier may carry the interface identifier of each network interface among the multiple network interfaces, and the interface identifier corresponding to the interface identifier.
  • S203 The first network device publishes the first packet.
  • the changed state information of the network interface of the first network device and the slice identifier of the first network slice may be in the form of a type length value (TLV) field or a sub-TLV (sub-TLV) Carried in the first packet. These two pieces of information may be carried in the same TLV field or the same sub-TLV field, or may be carried in different TLV fields or different sub-TLV fields.
  • TLV type length value
  • sub-TLV sub-TLV
  • the TLV field or sub-TLV field includes: Type field, Length field, state (state) field, Reserved field and virtual transport network identifier (virtual transport network identifier, vtn-id) field.
  • Type field is used to indicate that the TLV field or the sub-TLV field is a field used to carry state information after the network interface changes and a slice identifier of the first network slice.
  • Length field is the length of the TLV field or sub-TLV field.
  • the state field is used to carry the state information after the network interface changes.
  • the vtn-id field is used to carry the slice identifier of the first network slice, and can occupy 4 octets.
  • the Reserved field is used to carry other information.
  • the identifier of the network interface of the first network device may be carried in the same TLV field or the same sub-TLV field as the changed state information and the slice identifier of the first network slice, or may be carried in other field, this application does not specifically limit it.
  • the first network device may issue the first message to the second network device based on the IGP, and the first message may be, for example, an intermediate system to intermediate system (Intermediate System to Intermediate System, ISIS) report Message or Open Shortest Path First (OSPF) message.
  • ISIS Intermediate System to Intermediate System
  • OSPF Open Shortest Path First
  • the target device is the control device
  • the first network device may issue a first packet to the control device based on BGP, and the first packet may be, for example, a BGP packet.
  • the changed status information of the network interface and the slice identifier of the first network slice are carried in the layer 2 (layer 2) of the ISIS packet or the OSPF packet Lay 2, L2) bundle member attributes (Bundle Member Attributes) type length value (type length value, TLV) field.
  • the L2 Bundle Member Attributes TLV field of the ISIS message includes a layer 2 bundle attribute descriptor (L2 Bundle Attribute Descriptors) field, and the changed state information and the slice identifier of the first network slice can be carried in In the L2 Bundle Attribute Descriptors field.
  • L2 Bundle Attribute Descriptors layer 2 bundle attribute descriptor
  • the L2 Bundle Attribute Descriptors field includes: length (len) field, descriptor (Desc) field, link local identifier bundle member (Link local Identifier Bundle Member) #1 field and Link local Identifier Bundle Member #2 field.
  • the value of the len field is 25, the value of the Desc field is 2
  • the value of the Link local Identifier Bundle Member#1 field is 0x11111111
  • the value of the Link local Identifier Bundle Member#2 field is 0x11112222.
  • the L2 Bundle Attribute Descriptors field may also include the sub-TLV field shown in Figure 3 to carry the status information of the network interface after the change and the slice identifier of the first network slice.
  • the L2 Bundle Member Attributes TLV field of the ISIS packet can also carry the identifier of the network interface.
  • the identifier of the network interface may be embodied as an Internet Protocol (Internet Protocol, IP) address or index of the network interface.
  • the L2 Bundle Member Attributes TLV field includes the Internet Protocol version 4 (Internet Protocol version 4, IPv4) interface address (interface address) sub-TLV field or the Internet Protocol version 6 (Internet Protocol version 6, IPv6) interface address sub-TLV field -TLV field, the IPv4interface address sub-TLV field is used to carry the IPv4 address of the network interface, and the IPv6interface address sub-TLV field is used to carry the IPv6 address of the network interface.
  • IPv4interface address sub-TLV field is used to carry the IPv4 address of the network interface
  • IPv6interface address sub-TLV field is used to carry the IPv6 address of the network interface.
  • the L2 Bundle Member Attributes TLV field may also include a link local identifier (Link local Identifier) field of the network interface, which is used to carry the index of the network interface.
  • Link local Identifier a link local identifier
  • the network device 101 includes two network interfaces whose indexes are 01 and 02 respectively.
  • the L2 Bundle Member Attributes TLV field includes: Type field, Length field, L2 Bundle Member Descriptor field, and member link attribute (Member Link attribute) subtype length value (sub-TLV) field.
  • member link attribute Member Link attribute subtype length value
  • the changed state information and the slice identifier of the first network slice may be a sub-TLV in the Member Link attribute sub-TLV field in the sub-TLV format shown in FIG. 3 .
  • the Member Link attribute sub-TLV field can also carry the identifier of the network interface.
  • the Member Link attribute sub-TLV field includes a local interface identifier (local interface ID) sub-TLV field, which is used to carry the index of the network interface.
  • the Member Link attribute sub-TLV field can also carry the local interface IPv6 address field, which is used to carry the IPv6 address of the network interface.
  • the changed state information and the slice identifier of the first network slice are carried in the link state (Link-State) network layer reachability information (Network Layer) of the BGP message.
  • Reachability Information, NLRI Reachability Information
  • Figure 6 is a schematic diagram of the format of the Link-State NLRI field.
  • the Link-State NLRI field includes the Protocol-ID field, the Identifier field (64bits), the Local Node Descriptors field, the Remote Node Descriptors field, and the Remote Node Descriptors field. ) field and link descriptor (Link Descriptors) field.
  • Local Node Descriptors field, Remote Node Descriptors field and Link Descriptors field are optional (variable).
  • the Link Descriptors field includes the Link Local Identifier field, which is used to carry the identifier of the network interface.
  • the Link Descriptors field may further include the sub-TLV field shown in FIG. 3 , which is used to carry the changed state information of the network interface and the slice identifier of the first network slice.
  • S204 The target device receives the first packet from the first network device.
  • S205 The target device processes the forwarding path according to the changed state information of the network interface.
  • the target device when the target device has the ability to process the forwarding path, for example, the target device is a control device or an edge network device capable of calculating paths, then the target device can The changed state information processes the forwarding path, where the forwarding path is a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice.
  • the content indicated by the changed state information is different, and the manner in which the target device processes the forwarding path is also different.
  • the target device may Finding pre-stored path information of a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice, and deleting the path information of the forwarding path or invalidating the path information of the forwarding path . Moreover, after deleting the path information of the forwarding path or invalidating the path information of the forwarding path, the target device also needs to notify other network devices other than the first network device that the forwarding path passes through, so as to avoid passing through the forwarding path. The path forwards packets, resulting in packet loss.
  • the target device After the target device finds the path information of the forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice, the target device divides the network Other network interfaces other than the interface recalculate the forwarding path corresponding to the slice identifier of the first network slice.
  • the target device may send the forwarding information of the recalculated forwarding path to the network device on the forwarding path, so as to achieve the purpose of forwarding the packet of the first network slice by transmitting a normal forwarding path.
  • the target device When the changed state information indicates that the network interface newly configures the first network slice, the target device generates a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice, And store the correspondence between the identifier of the network interface, the slice identifier of the first network slice, and the path information of the forwarding path.
  • the target device may also issue forwarding information of the forwarding path to network devices on the forwarding path, so as to forward the packets of the first network slice through the forwarding path.
  • the target device may regenerate the forwarding path, and store the correspondence between the identifier of the network interface, the slice identifier of the first network slice, and the path information of the forwarding path.
  • the target device invalidates the path information of the forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice, then when the changed state information indicates that the network
  • the target device may set the path information of the forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice as valid. After regenerating the forwarding path or validating the path information, the target device may notify network devices on the forwarding path so that the forwarding path can forward the packets of the first network slice.
  • the first network device and the target device are not directly connected, that is, there are other network devices connected between the two, then these network devices can forward the first message so that the target device can receive the first packet. message, and perform subsequent steps.
  • the embodiment of the present application only releases the information carrying the network interface to the target device when the status information of the network interface of the first network device changes.
  • the changed state information, the identifier of the network interface, and the first message corresponding to the slice identifier of the first network slice reduce the number of message releases, and do not need to wait until the end of the cycle timing to release, saving release time and improving The processing efficiency of the target device is improved.
  • FIG. 1 uses FIG. 1 as an example to introduce how to check out the unconfigured network slice corresponding to the network interface, and how to generate the forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice.
  • the control device 201 may issue corresponding slice instance information to the network device 101, the network device 102, the network device 103, and the network device 104 communicating with it, and the slice instance information includes a flexible algorithm (flexible algorithm, The corresponding relationship between the FA identification (identification, ID) of the FA) and the slice identification of the network slice.
  • the FA ID is used to identify the algorithm constraints of the flexible algorithm.
  • the slice instance information may also include an algorithm constraint corresponding to the FA ID, so that the above-mentioned network device communicating with the control device 201 obtains and stores the above-mentioned information.
  • the algorithm constraints can also be directly configured in the above-mentioned network device, that is, the control device 201 only issues the correspondence between the FA ID and the slice identifier, but does not issue the algorithm constraints corresponding to the FA ID.
  • the algorithm constraints of the flexible algorithm include, for example, a metric type, a calculation type, and a link attribute.
  • Link attributes are represented by colors, and different link attributes correspond to different colors.
  • Network devices with the same link attributes form a network topology, and a corresponding forwarding path is calculated based on the network topology.
  • Constraints can also include:
  • Exclude Admin Group (Exclude Admin Group): The specified link management group cannot contain any referenced affinity attribute name, and links that do not meet the requirements will be excluded and cannot participate in path calculation.
  • Include-All Admin Group Specifies that the link management group should include all referenced affinity attribute names, and the unsatisfactory links will be excluded and cannot participate in path calculation.
  • control device 201 sends to the network device 101, the network device 102, the network device 103, and the network device 104 respectively the correspondence between the FA ID 128 and the slice identification of the network slice 1, and the correspondence between the FA ID 129 and the slice identification of the network slice 2 relation.
  • Network slice 2 is used to transmit packets of low-latency services, and the corresponding algorithm constraints are:
  • the network device can select an algorithm constraint corresponding to the slice ID according to the priority of the algorithm constraints.
  • the control device 201 also issues the corresponding relationship between the corresponding interface set and the slice identifier of the network slice to the network device 104 communicating with it.
  • control device 201 sends to the network device 101 the correspondence between interface set A and the slice identifier of network slice 1, and the correspondence between interface set B and the slice identifier of network slice 2, where interface set A and interface set B respectively include network One or more network interfaces of device 101.
  • the network device determines the set of interfaces satisfying the algorithm constraints according to the algorithm constraints corresponding to the network slice.
  • the network device 101 determines, according to the algorithm constraint condition corresponding to the network slice 1, that the interface set satisfying the algorithm constraint condition is the interface set A'.
  • the network device 101 determines, according to the algorithm constraints corresponding to the network slice 2, that the interface set satisfying the algorithm constraints is the interface set B'.
  • the network device compares the interface set corresponding to the network slice issued by the control device 201 with the interface set determined according to the algorithm constraints of the network slice, and if one or more interfaces in the interface set determined according to the algorithm constraints are not delivered In the interface set of , it means that one or more interfaces are not configured with network slicing.
  • interface set A' corresponding to network slice 1 determined by network device 101 includes sub-interface a of interface 1 and sub-interface b of interface 2
  • the interface set A' corresponding to network slice 1 issued by control device 201 includes interface Sub-interface a of interface 1 and sub-interface b of interface 2
  • interface set A' is all included in interface set A, indicating that sub-interface a of interface 1 and sub-interface b of interface 2 are configured with network slice 1.
  • the interface set B' corresponding to the network slice 2 determined by the network device 101 includes the sub-interface c of the interface 1 and the sub-interface d of the interface 2
  • the interface set B corresponding to the network slice 2 issued by the control device 201 includes the interface
  • the first packet can be published.
  • the first message can be issued, and the first message can carry the interface
  • the identifier of the sub-interface d of 2 the slice identifier of the network slice 2
  • the changed status information is used to indicate that the sub-interface d deletes and configures the network slice 2.
  • control device 201 After the control device 201 knows which corresponding network slices are configured on the network interfaces of each network device, it can calculate the forwarding path configured with the same network slice, and store the path information of the forwarding path, the identifier of the network interface, and the ID of the network slice. Correspondence between identities. In addition, the control device 201 may deliver the path information to a corresponding network device, so as to achieve the purpose of forwarding the packets belonging to the network slice through the forwarding path.
  • control device 201 may issue a segment routing (Segment Routing) policy (policy) or an IPv6 segment routing (Segment Routing IPv6, SRv6) policy, which carries path information, and the path information may be embodied as a segment identifier (Segment Identifier, SID) list (list).
  • segment Routing Segment Routing
  • IPv6 IPv6, SRv6
  • the forwarding path corresponding to network slice 1 calculated by the control device 201 is network device 101-network device 102-network device 104, then the control device 201 can store the SID list of the forwarding path, the sub-interface a of the network device 101, and The corresponding relationship of the network slice 1, and send the SID list to the network device 101, so that the network device 101 generates a corresponding forwarding table according to the SID list, and the outgoing interface of the forwarding table is the sub-interface a. Based on the forwarding table, network device 101 may forward the packet to network device 102 through sub-interface a.
  • the embodiment of the present application also provides a message publishing apparatus 700 , which can realize the function of the first network device in the embodiment shown in FIG. 2 .
  • the message publishing apparatus 700 includes a processing unit 701 and a sending unit 702 .
  • the processing unit 701 is configured to implement S201 and S202 in the embodiment shown in FIG. 2 ;
  • the sending unit 702 is configured to implement S203 in the embodiment shown in FIG. 2 .
  • the processing unit 701 is configured to acquire the state information of the network interface, and generate a first message in response to a change in the state information of the network interface, and the first message carries the identifier and change of the network interface
  • the changed state information and the slice identifier of the first network slice, the changed state information indicates the changed state of the network interface belonging to the first network slice.
  • the embodiment of the present application further provides a forwarding path processing apparatus 800 , and the forwarding path processing apparatus 800 can realize the function of the target device in the embodiment shown in FIG. 2 .
  • the forwarding path processing apparatus 800 includes a receiving unit 801 and a processing unit 802 .
  • the receiving unit 801 is configured to implement S204 in the embodiment shown in FIG. 2 ;
  • the processing unit 802 is configured to implement S205 in the embodiment shown in FIG. 2 .
  • the receiving unit 801 is configured to receive a first packet from the first network device, the first packet carrying the identifier of the network interface, the changed state information of the network interface, and the first network A slice identifier of a slice, and the changed state information indicates a changed state of the network interface belonging to the first network slice.
  • the processing unit 802 is configured to process a forwarding path according to the changed state information, where the forwarding path is a forwarding path corresponding to the identifier of the network interface and the slice identifier of the first network slice.
  • each functional unit in the embodiment of the present application may be integrated into one processing unit, or each unit may physically exist separately, or two or more units may be integrated into one unit.
  • the acquisition unit and the processing unit may be the same unit or different units.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • FIG. 9 is a schematic structural diagram of a device 900 provided by an embodiment of the present application.
  • the device 700 for publishing the message or the device 800 for processing the forwarding path mentioned above can be implemented by the device shown in FIG. 9 .
  • the device 900 includes at least one processor 901 , a communication bus 902 and at least one network interface 904 , and optionally, the device 900 may further include a memory 903 .
  • the processor 901 may be a central processing unit (central processing unit, CPU), a network processor (network processor, NP) or a combination of CPU and NP. In an implementation manner, the processor 901 may also be a traffic management (traffic management, TM) chip or hardware integrated with NP and TM chips, and the TM chip or hardware integrated with NP and TM chips may control the TM chip
  • the queue executes the queue scheduling method provided by the embodiment of this application.
  • the processor 1010 may further include a hardware chip.
  • the aforementioned hardware chip may be an application-specific integrated circuit (application-specific integrated circuit, ASIC), a programmable logic device (programmable logic device, PLD) or a combination thereof.
  • the aforementioned PLD may be a complex programmable logic device (complex programmable logic device, CPLD), a field-programmable gate array (field-programmable gate array, FPGA), a general array logic (generic array logic, GAL) or any combination thereof.
  • the processor can be used to update or verify the data message, so as to implement the message transmission method provided in the embodiment of the present application.
  • the processor may be configured to: obtain status information of the network interface, and generate a second network interface in response to a change in the status information of the network interface. A message, publishing the first message.
  • the processor may be configured to: receive the first message from the first network device, and process the forwarding path according to the changed state information .
  • Communication bus 902 is used to transfer information between processor 901 , network interface 904 and memory 903 .
  • the bus system 902 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus or the like.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus system 902 can be divided into address bus, data bus, control bus, etc., which are represented by only one thick line in FIG. 9 , but it does not mean that there is only one bus or one type of bus.
  • the memory 903 can be a read-only memory (read-only memory, ROM) or other types of static storage devices that can store static information and instructions, and the memory 903 can also be a random access memory (random access memory, RAM) or can store information and other types of dynamic storage devices for instructions, and can also be compact disc read-only Memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, Blu-ray optical discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.
  • the memory 903 may exist independently, and is connected to the processor 901 through the communication bus 902 .
  • the memory 903 can also be integrated with the processor 901.
  • the memory 903 is used to store program codes or instructions for implementing the solutions of the present application, and the execution is controlled by the processor 901 .
  • the processor 901 is used to execute program codes or instructions stored in the memory 903 .
  • One or more software modules may be included in the program code.
  • the processor 901 may also store program codes or instructions for executing the solutions of the present application. In this case, the processor 901 does not need to read the program codes or instructions from the memory 903 .
  • the network interface 904 can be a device such as a transceiver for communicating with other devices or a communication network, and the communication network can be Ethernet, radio access network (RAN) or wireless local area networks (wireless local area networks, WLAN).
  • the network interface 904 may be used to receive messages sent by other nodes in the segment routing network, and may also send messages to other nodes in the segment routing network.
  • the network interface 904 may be an Ethernet interface (ethernet) interface, a fast ethernet (fast ethernet, FE) interface or a gigabit ethernet (gigabit ethernet, GE) interface, etc.
  • the device 900 may include multiple processors, for example, the processor 901 and the processor 905 shown in FIG. 9 .
  • Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor.
  • a processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (eg, computer program instructions).
  • FIG. 10 is a schematic structural diagram of a device 1000 provided in an embodiment of the present application. Any one or more of the first network device and the target device in FIG. 2 may be implemented by the device shown in FIG. 10 .
  • the device 1000 includes a main control board and one or more interface boards.
  • the main control board is communicatively connected with the interface board.
  • the main control board is also called a main processing unit (main processing unit, MPU) or a route processing card (route processor card).
  • the main control board includes a CPU and a memory. Route calculation, device management and maintenance functions.
  • the interface board is also called a line processing unit (line processing unit, LPU) or a line card (line card), and is used to receive and send packets.
  • the communication between the main control board and the interface board or between the interface board and the interface board is through a bus.
  • the interface boards communicate through the SFU.
  • the device 1000 also includes the SFU.
  • the SFU communicates with the main control board and the interface board.
  • the SFU is used to forward the interface board.
  • the data between them, the SFU can also be called a switch fabric unit (SFU).
  • the interface board includes a CPU, a memory, a forwarding engine, and an interface card (interface card, IC), where the interface card may include one or more network interfaces.
  • the network interface may be an Ethernet interface, an FE interface, or a GE interface.
  • the CPU communicates with the memory, the forwarding engine and the interface card respectively.
  • the memory is used to store the forwarding table.
  • the forwarding engine is used to forward the received message based on the forwarding table stored in the memory.
  • the message is sent to the CPU of the main control board or the interface board for further processing. Processing; if the destination address of the received message is not the IP address of the device 1000, the forwarding table is checked according to the destination, if the next hop and the outgoing interface corresponding to the destination address are found from the forwarding table, the message is Forward to the outbound interface corresponding to the destination address.
  • the forwarding engine may be a network processor (network processor, NP).
  • the interface card is also called a daughter card, which can be installed on the interface board. It is responsible for converting the photoelectric signal into a data frame, and checking the validity of the data frame before forwarding it to the forwarding engine for processing or the CPU of the interface board.
  • the CPU can also perform the function of the forwarding engine, such as implementing soft forwarding based on a general-purpose CPU, so that no forwarding engine is needed in the interface board.
  • the forwarding engine may be implemented by an ASIC or a field programmable gate array (field programmable gate array, FPGA).
  • the memory storing the forwarding table can also be integrated into the forwarding engine as a part of the forwarding engine.
  • the embodiment of the present application also provides a chip system, including: a processor, the processor is coupled with a memory, and the memory is used to store programs or instructions, and when the programs or instructions are executed by the processor, the The chip system implements the packet transmission method provided in the embodiment shown in FIG. 2 above.
  • processors in the chip system there may be one or more processors in the chip system.
  • the processor can be realized by hardware or by software.
  • the processor may be a logic circuit, an integrated circuit, or the like.
  • the processor may be a general-purpose processor implemented by reading software codes stored in a memory.
  • the memory can be integrated with the processor, or can be set separately from the processor, which is not limited in this application.
  • the memory can be a non-transitory processor, such as a read-only memory ROM, which can be integrated with the processor on the same chip, or can be respectively arranged on different chips.
  • the setting method of the processor is not specifically limited.
  • the system-on-a-chip can be an FPGA, an ASIC, a system on chip (SoC), a CPU, an NP, or a digital signal processing circuit (digital signal processor, DSP), can also be a microcontroller (micro controller unit, MCU), can also be a programmable controller (programmable logic device, PLD) or other integrated chips.
  • SoC system on chip
  • DSP digital signal processing circuit
  • MCU microcontroller
  • PLD programmable controller
  • each step in the foregoing method embodiments may be implemented by an integrated logic circuit of hardware in a processor or instructions in the form of software.
  • the method steps disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.
  • the embodiment of the present application also provides a computer-readable storage medium, including instructions, which, when run on a computer, cause the computer to execute the method for issuing a message provided by the first network device provided in the above method embodiment, or by The forwarding path processing method performed by the target device.
  • the embodiment of the present application also provides a computer program product containing instructions. When it is run on a computer, it causes the computer to execute the message distribution method provided by the above method embodiment and executed by the first network device, or the target device The forwarding path processing method to execute.
  • the disclosed system, device and method can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical module division.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be obtained according to actual needs to achieve the purpose of the solution of this embodiment.
  • each module unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software module units.
  • the integrated unit is implemented in the form of a software module unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .
  • the functions described in the present invention may be implemented by hardware, software, firmware or any combination thereof.
  • the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

本申请公开了一种报文发布方法、转发路径处理方法及装置，用于节约网络资源，以及提高处理效率。其中，报文发布方法包括：第一网络设备获取网络接口的状态信息；响应于所述网络接口的状态信息发生变化，所述第一网络设备生成第一报文，所述第一报文中携带所述网络接口的标识、变化后的状态信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态；所述第一网络设备发布所述第一报文。

Description

一种报文发布方法、转发路径处理方法及装置
本申请要求于2021年6月11日提交的申请号为202110656186.6、申请名称为“一种报文发布方法、转发路径处理方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种报文发布方法、转发路径处理方法及装置。
背景技术
网络切片(network slicing)，本质上就是将运营商的物理网络划分为多个虚拟网络，每一个虚拟网络根据不同的服务需求，比如时延、带宽、安全性和可靠性等来划分，以灵活的应对不同的网络应用场景。通过为网络拓扑中网络设备的网络接口配置对应的网络切片，根据该网络切片生成虚拟网络的转发路径，利用该转发路径转发报文，从而满足业务对该网络切片的服务需求。
在传统技术中，网络设备周期性的向其他设备发送其网络接口配置的网络切片的信息，以使其他设备知晓该信息，从而进行相应处理。但是这种方式对网络资源消耗较大，且效率较低。
发明内容
本申请实施例提供了一种报文发布方法、转发路径处理方法及装置，用于节约网络资源，以及提高处理效率。
第一方面，提供了一种报文发布方法，应用于第一网络设备，所述方法包括如下步骤：第一网络设备获取网络接口的状态信息，例如网络接口是否配置有对应的网络切片、网络接口是否发生故障等。响应于所述网络接口的状态信息发生变化，所述第一网络设备生成第一报文，所述第一报文中携带所述网络接口的标识、变化后的状态信息以及第一网络切片的切片标识。其中，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态。所述第一网络设备发布所述第一报文。相对于传统技术周期性的发布网络接口及配置的网络切片的信息的方案，本申请实施例只在第一网络设备的网络接口的状态信息发生变化时，才发布携带该网络接口的变化后的状态信息、该网络接口的标识以及对应的第一网络切片的切片标识的第一报文，减少报文发布的数量，且不需要等到周期计时结束时发布，节约了发布时间，提高了接收该第一报文的设备对该第一报文的处理效率。
网络接口的状态信息发生变化可以有如下四种可能的实现方式，下面结合这四种可能的实现方式对所述第一网络设备生成第一报文的步骤进行介绍。
实现方式一：响应于所述网络接口新增配置所述第一网络切片，所述第一网络设备生成第一报文。
实现方式二：响应于所述网络接口删除配置所述第一网络切片，所述第一网络设备生成第一报文。
实现方式三：响应于所述网络接口从正常状态变化为故障状态，所述第一网络设备获取所述第一网络切片的切片标识，并根据所述第一网络切片的切片标识生成第一报文。
实现方式四：响应于所述网络接口从故障状态恢复为正常状态，所述第一网络设备获 取所述第一网络切片的切片标识，并根据所述第一网络切片的切片标识生成第一报文。
上述四种可能的实现方式并不构成对本申请技术方案的限定，本领域技术人员可以根据具体情况自行设计。
作为一种可能的设计，所述第一报文为中间系统到中间系统(Intermediate System to Intermediate System，ISIS)报文、开放式最短路径优先(Open Shortest Path First，OSPF)报文或边界网关协议(Border Gateway Protocol，BGP)报文。
作为一种可能的设计，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述ISIS报文或所述OSPF报文的二层捆绑成员属性(L2 Bundle Member Attributes)类型长度值(type length value,TLV)字段中。
作为一种可能的设计，所述ISIS报文的L2 Bundle Member Attributes TLV字段包括二层捆绑属性描述(L2 Bundle Attribute Descriptors)字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述L2 Bundle Attribute Descriptors字段中。
作为一种可能的设计，所述OSPF报文的L2 Bundle Member Attributes TLV字段包括成员链路属性(Member Link attribute)子类型长度值(sub-TLV)字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Member Link attribute sub-TLV字段中。
作为一种可能的设计，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述BGP报文的链路状态(Link-State)网络层可达信息(Network Layer Reachability Information，NLRI)字段中。
作为一种可能的设计，所述Link-State NLRI字段包括链路描述符(Link Descriptors)字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Link Descriptors字段中。
作为一种可能的设计，所述第一报文用于根据所述网络接口的变化后的状态信息对转发路径进行处理，以实现根据正确的转发路径传输报文的目的。其中，所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。
作为一种可能的设计，所述第一网络设备发布所述第一报文，包括：所述第一网络设备向控制设备或第二网络设备发布所述第一报文，以便控制设备或具有算路能力的第二网络设备根据第一报文对转发路径进行处理。当然，第二网络设备还可以是没有算路能力的网络设备，实现在网络拓扑中泛洪第一报文的目的。
第二方面，提供了一种转发路径处理方法，应用于目标设备，该目标设备可以是控制设备，也可以是第二网络设备。所述方法包括如下步骤：目标设备接收来自第一网络设备的第一报文，所述第一报文中携带所述网络接口的标识、所述网络接口的变化后的状态信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态。所述目标设备根据所述变化后的状态信息对转发路径进行处理，其中所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。由于第一报文是在网络接口的状态信息出现变化时发送的，相对于传统技术不仅减少报文发送量，而且不需要如传统技术那样等到周期结束时发送，提高目标设备对转发路径的处理效率。目标设备能够及时的通过根据变化后的状态信息对转发路径进行处理， 减少根据错误的转发路径传输报文的可能性，保证网络的可靠性。
所述目标设备根据所述变化后的状态信息对转发路径进行处理，根据状态信息的不同处理方式也不同：
作为一种可能的实现方式，响应于所述变化后的状态信息指示所述网络接口删除配置所述第一网络切片，或，响应于所述变化后的状态信息指示所述网络接口从正常状态变化为故障状态，所述目标设备查找与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径的路径信息。并且，所述目标设备删除所述转发路径的路径信息或将所述转发路径的路径信息置为无效，避免继续使用错误的转发路径。或者，所述目标设备根据属于所述第一网络切片的除所述网络接口以外的其他网络接口重新计算与所述第一网络切片的切片标识对应的转发路径，以保证采用正确的转发路径进行报文传输。
作为另一种可能的实现方式，响应于所述变化后的状态信息指示所述网络接口新增配置所述第一网络切片，所述目标设备生成与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，以通过该转发路径传输第一网络切片对应的报文。并且，目标设备存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系，以便后续目标设备根据该对应关系进行相应处理，例如向第一网络设备下发该对应关系，以使第一网络设备根据转发路径的路径信息生成用于转发报文的路由表和转发表。
作为再一种可能的实现方式，若在网络接口处于故障状态时，目标设备删除了与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，那么响应于所述变化后的状态信息指示所述网络接口从故障状态恢复为正常状态，所述目标设备生成与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，或，所述目标设备将与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径的转发信息置为有效，以通过该转发路径传输第一网络切片对应的报文。并且，目标设备存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系。
关于第一报文的类型以及变化后的状态信息和第一网络切片的切片标识在第一报文中携带的位置，请参见上文，此处不再赘述。
第三方面，提供了一种报文发布装置，应用于第一网络设备，所述装置包括：处理单元，用于获取网络接口的状态信息；所述处理单元，还用于响应于所述网络接口的状态信息发生变化，生成第一报文，所述第一报文中携带所述网络接口的标识、变化后的状态信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态；发送单元，用于发布所述第一报文。
作为一种可能的设计，响应于所述网络接口的状态信息发生变化，所述处理单元生成第一报文，包括：响应于所述网络接口删除配置所述第一网络切片，所述处理单元生成第一报文；或，响应于所述网络接口新增配置所述第一网络切片，所述处理单元生成第一报文。
作为一种可能的设计，响应于所述网络接口的状态信息发生变化，所述处理单元生成第一报文，包括：响应于所述网络接口从正常状态变化为故障状态，所述处理单元获取所 述第一网络切片的切片标识，并根据所述第一网络切片的切片标识生成第一报文。
作为一种可能的设计，响应于所述网络接口的状态信息发生变化，所述处理单元生成第一报文，包括：响应于所述网络接口从故障状态恢复为正常状态，所述处理单元获取所述第一网络切片的切片标识，并根据所述第一网络切片的切片标识生成第一报文。
作为一种可能的设计，所述第一报文用于根据所述网络接口的变化后的状态信息对转发路径进行处理，所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。
作为一种可能的设计，所述发送单元，用于向控制设备或第二网络设备发布所述第一报文。
第四方面，提供了一种转发路径处理装置，应用于目标设备，所述装置包括：接收单元，用于接收来自第一网络设备的第一报文，所述第一报文中携带所述网络接口的标识、所述网络接口的变化后的状态信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态；处理单元，用于根据所述变化后的状态信息对转发路径进行处理，所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。
作为一种可能的设计，所述处理单元，用于响应于所述变化后的状态信息指示所述网络接口删除配置所述第一网络切片，或，响应于所述变化后的状态信息指示所述网络接口从正常状态变化为故障状态，查找与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径的路径信息；所述处理单元，还用于删除所述转发路径的路径信息或将所述转发路径的路径信息置为无效；或，根据属于所述第一网络切片的除所述网络接口以外的其他网络接口重新计算与所述第一网络切片的切片标识对应的转发路径。
作为一种可能的设计，所述处理单元，用于响应于所述变化后的状态信息指示所述网络接口新增配置所述第一网络切片，生成与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，并存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系。
作为一种可能的设计，所述处理单元，用于响应于所述变化后的状态信息指示所述网络接口从故障状态恢复为正常状态，生成与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，并存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系；或，将与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径的转发信息置为有效。
作为一种可能的设计，所述目标设备为控制设备或第二网络设备。
第五方面，提供了一种网络设备，所述网络设备包括处理器芯片和存储器，存储器用于存储指令或程序代码，处理器芯片用于从存储器中调用并运行所述指令或程序代码，以执行如第一方面所述的报文发布方法。
第六方面，提供了一种设备，所述设备包括处理器芯片和存储器，存储器用于存储指令或程序代码，处理器芯片用于从存储器中调用并运行所述指令或程序代码，以执行如第二方面所述的转发路径处理方法。
第七方面，提供了一种计算机可读存储介质，包括指令、程序或代码，当其在计算机上执行时，使得所述计算机执行如第一方面所述的报文发布方法或如第二方面所述的转发路径处理方法。
附图说明
图1为本申请实施例提供的网络系统的结构示意图；
图2为本申请实施例提供的一种转发路径处理方法的流程图；
图3为本申请实施例提供的TLV字段或sub-TLV字段的格式示意图；
图4为本申请实施例提供的ISIS报文的L2 Bundle Attribute Descriptors字段的格式示意图；
图5为本申请实施例提供的OSPF报文的L2 Bundle Member Attributes TLV字段的格式示意图；
图6为本申请实施例提供的BGP报文的Link-State NLRI字段的格式示意图；
图7为本申请实施例提供的报文发布装置700的结构示意图；
图8为本申请实施例提供的转发路径处理装置800的结构示意图；
图9为本申请实施例提供的设备900的结构示意图；
图10为本申请实施例提供的设备1000的结构示意图。
具体实施方式
传统技术中，网络设备周期性的向其他设备发送该网络设备的网络接口配置的网络切片的信息。具体的，网络设备向其他设备周期性的发送报文，该报文中携带该网络设备的一个或多个网络接口中每个网络接口的标识，以及为所述网络接口配置的网络切片的标识。倘若该网络设备的某个网络接口没有被配置网络切片，那么报文中不包括与该网络接口对应的网络切片的标识。倘若某个网络接口出现故障，那么报文中不包括该网络接口的标识以及对应的网络切片的标识。
例如，网络设备A包括网络接口1、网络接口2和网络接口3，其中，网络接口1配置有网络切片1，网络接口2配置有网络切片2，网络接口3没有配置网络切片。那么网络设备A在向其他设备发送的报文中，包括网络接口1的标识、网络切片1的标识、网络接口2的标识、网络切片2的标识以及网络接口3的标识。若网络接口1发生故障，那么网络设备A在向其他设备发送的报文中包括网络接口2的标识、网络切片2的标识以及网络接口3的标识。
当网络设备在一段时间内网络接口和对应的网络切片的信息不发生变化，那么周期性上报这种方式一方面会造成传输资源的浪费，另外一方面也会使得其他设备因为处理该报文而造成处理资源的浪费。而且，当网络接口的状态在一个上报周期内发生变化，报文也需要在该周期计时结束时上报，影响其他设备获取并处理该报文中信息的效率。
为了克服上述技术问题，本申请实施例提供了一种转发路径处理方法及设备，用于节约网络资源，提高处理效率。
本申请实施例提供的转发路径处理方法可以例如应用于图1所示的网络系统。在该图中，网络系统包括网络设备101、网络设备102、网络设备103、网络设备104以及控制设 备201。其中，网络设备101分别与网络设备102和网络设备103连接，网络设备102和网络设备103均与网络设备104连接，控制设备201分别与网络设备101、网络设备102、网络设备103和网络设备104连接。
网络设备101、网络设备102、网络设备103和网络设备104例如可以是路由器(router)、交换机(switch)等支持路由功能的实体设备，也可以是部署虚拟路由器或虚拟交换机的服务器。网络设备101、网络设备102、网络设备103和网络设备104之间可以基于内部网关协议(Interior Gateway Protocol，IGP)建立邻居关系。
控制设备201例如可以是网络控制单元(Net Control Element，NCE)等。控制设备201和网络设备101以及网络设备104之间可以通过边界网关协议(Border Gateway Protocol，BGP)建立邻居关系。
参见图2，该图为本申请实施例提供的一种转发路径处理方法的流程图。
该转发路径处理方法包括如下步骤：
S201：第一网络设备获取网络接口的状态信息。
在本申请实施例中，第一网络设备可以例如为图1中的网络设备101、网络设备102、网络设备103或网络设备104。
在本申请实施例中，第一网络设备可以具有一个或多个网络接口，该网络接口可以为物理接口，也可以是虚拟接口(也可以成为子接口)。
第一网络设备获取网络接口的状态信息，所述状态信息指示网络接口的状态。例如，网络接口是否配置有对应的网络切片、网络接口是否发生故障等。其中，一个网络接口可以配置有一个或多个网络切片。网络接口发生故障可以是在物理层面发生故障，也可以是在协议层面发生故障。不管是哪个层面发生故障，都导致网络接口无法接收或发送报文。
S202：响应于所述网络接口的状态信息发生变化，所述第一网络设备生成第一报文。
在本申请实施例中，当第一网络设备确认网络接口的状态信息发生变化，第一网络设备可以根据该网络接口的标识、变化后的状态信息以及第一网络切片的切片标识生成第一报文，其中，变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态。
其中，网络接口的状态信息发生变化可以有如下几种场景，下面结合这几种不同的场景对第一报文携带的信息进行介绍。
场景一：网络接口新增配置第一网络切片。
在网络接口新增配置第一网络切片前，第一网络设备获取到的网络接口的状态信息为该网络接口未配置第一网络切片(检查出未配置网络切片的过程请参见后文，此处不再赘述)。那么该网络接口新增配置第一网络切片的动作可以触发第一报文的生成。第一报文中携带该网络接口的标识、该第一网络切片的切片标识以及网络接口变化后的状态信息，其中，该变化后的状态信息指示所述第一网络切片为该网络接口新增配置的网络切片。
若该网络接口在新增配置第一网络切片前已经配置有其他网络切片，第一报文中可以只携带第一网络切片的标识，而不需要携带其他网络切片的标识，以节约网络资源。
场景二：网络接口删除配置第一网络切片。
在网络接口删除配置第一网络切片前，第一网络设备获取到的网络接口的状态信息为该网络接口配置第一网络切片。那么该网络设备删除配置第一网络切片的动作可以触发第一报文的生成。第一报文中携带该网络接口的标识、该第一网络切片的切片标识以及网络接口变化后的状态信息，其中，该变化后的状态信息指示所述该网络接口删除配置该第一网络切片。
场景三：网络接口从正常状态变化为故障状态。
在网络接口出现故障之前，第一网络设备获取到的网络接口的状态信息为该网络接口为正常状态，即能够接收报文或发送报文。当该网络接口发生故障时，第一网络设备获取为该网络接口配置的第一网络切片的切片标识，并触发生成第一报文。第一报文中携带该网络接口的标识、该第一网络切片的切片标识以及网络接口变化后的状态信息，其中，该变化后的状态信息指示所述该网络接口发生故障。
若网络接口除了配置有第一网络切片以外，还配置有其他网络切片，那么第一报文中还可以携带其他网络切片的标识，以告知接收第一报文的设备由于网络接口出现故障，所以无法传输与这些网络切片对应的报文。
场景四：所述网络接口从故障状态恢复为正常状态。
在网络接口恢复正常状态之前，第一网络设备获取到的网络接口的状态信息为该网络接口为故障状态。当该网络接口恢复正常状态时，第一网络设备获取之前为该网络接口配置的第一网络切片的切片标识，并触发生成第一报文。第一报文中携带该网络接口的标识、该第一网络切片的切片标识以及网络接口变化后的状态信息，其中，该变化后的状态信息指示所述该网络接口恢复为正常状态。
若网络接口除了配置有第一网络切片以外，还配置有其他网络切片，那么第一报文中还可以携带其他网络切片的标识，以告知接收第一报文的设备由于网络接口恢复为正常状态，所以能够传输与这些网络切片对应的报文。
上述四种场景并不构成对本申请技术方案的限定，本领域技术人员可以根据实际情况自行设计。
需要说明的是，当第一网络设备的多个网络接口的状态信息均发生变化，那么第一报文中可以携带多个网络接口中每个网络接口的接口标识，以及与该接口标识对应的变化后状态信息和与该接口标识对应的第一网络切片的切片标识。
S203：所述第一网络设备发布所述第一报文。
在本申请实施例中，第一网络设备可以向目标设备发布第一报文。其中，目标设备可以是第二网络设备，也可以是控制设备。例如，当第一网络设备为网络设备102时，目标设备可以是网络设备101或网络设备104。当第一网络设备为网络设备101时，目标设备可以是控制设备201。
在本申请实施例中，第一网络设备的网络接口的变化后状态信息和第一网络切片的切片标识可以以类型长度值(type length value,TLV)字段或者子TLV(sub-TLV)的形式携带在第一报文中。这两个信息可以携带在同一个TLV字段或者同一个sub-TLV字段中，也可以携带在不同的TLV字段或不同的sub-TLV字段中。
参见图3，该图为网络接口变化后状态信息和第一网络切片的切片标识携带在同一个TLV字段或同一个sub-TLV字段的格式示意图。该TLV字段或sub-TLV字段包括：Type字段、Length字段、状态(state)字段、Reserved字段以及虚拟传输网络标识(virtual transport network identifier，vtn-id)字段。其中，Type字段的值用于指示该TLV字段或sub-TLV字段是用于携带网络接口变化后状态信息和第一网络切片的切片标识的字段。Length字段的值为该TLV字段或sub-TLV字段的长度。state字段用于携带网络接口变化后的状态信息。vtn-id字段用于携带第一网络切片的切片标识，可以占用4octets。Reserved字段用于携带其他信息。
在本申请实施例中，第一网络设备的网络接口的标识可以与变化后状态信息和第一网络切片的切片标识携带在同一个TLV字段或同一个sub-TLV字段中，也可以携带在其他字段中，本申请不做具体限定。
当目标设备为第二网络设备时，第一网络设备可以基于IGP向第二网络设备发布第一报文，第一报文可以例如为中间系统到中间系统(Intermediate System to Intermediate System，ISIS)报文或开放式最短路径优先(Open Shortest Path First，OSPF)报文。当目标设备为控制设备时，第一网络设备可以基于BGP向控制设备发布第一报文，第一报文可以例如为BGP报文。
当第一报文为ISIS报文或OSPF报文时，网络接口的变化后的状态信息以及所述第一网络切片的切片标识携带在所述ISIS报文或所述OSPF报文的二层(Lay 2，L2)捆绑成员属性(Bundle Member Attributes)类型长度值(type length value,TLV)字段中。
具体的，所述ISIS报文的L2 Bundle Member Attributes TLV字段包括二层捆绑属性描述符(L2 Bundle Attribute Descriptors)字段，所述变化后的状态信息以及所述第一网络切片的切片标识可以携带在所述L2 Bundle Attribute Descriptors字段中。
参见图4，该图为L2 Bundle Attribute Descriptors字段的格式示意图。基于rfc8668，该L2 Bundle Attribute Descriptors字段包括：长度(len)字段、描述符(Desc)字段、链路本地标识捆绑成员(Link local Identifier Bundle Member)#1字段以及Link local Identifier Bundle Member#2字段。其中，len字段的值为25，Desc字段的值为2，Link local Identifier Bundle Member#1字段的值为0x11111111，Link local Identifier Bundle Member#2字段的值为0x11112222。除了上述字段以外，该L2 Bundle Attribute Descriptors字段还可以包括图3所示的sub-TLV字段，以携带网络接口变化后的状态信息以及第一网络切片的切片标识。
此外，ISIS报文的L2 Bundle Member Attributes TLV字段还可以携带网络接口的标识。网络接口的标识可以体现为网络接口的互联网协议(Internet Protocol，IP)地址或索引。
例如，该L2 Bundle Member Attributes TLV字段包括互联网协议第四版(Internet Protocol version 4，IPv4)接口地址(interface address)sub-TLV字段或互联网协议第六版(Internet Protocol version 6，IPv6)interface address sub-TLV字段，该IPv4interface address sub-TLV字段用于携带网络接口的IPv4地址，IPv6interface address sub-TLV字段用于携带网络接口的IPv6地址。
该L2 Bundle Member Attributes TLV字段还可以包括网络接口的链路本地标识(Link  local Identifier)字段，用于携带网络接口的索引。例如，网络设备101包括两个网络接口，这两个网络接口的索引分别为01和02。
参见图5，该图为OSPF报文的L2 Bundle Member Attributes TLV字段的格式示意图。在该图中，L2 Bundle Member Attributes TLV字段包括：Type字段、Length字段、L2 Bundle Member Descriptor字段以及成员链路属性(Member Link attribute)子类型长度值(sub-TLV)字段。其中，所述变化后的状态信息以及所述第一网络切片的切片标识可以以图3所示的sub-TLV等格式作为所述Member Link attribute sub-TLV字段中的一个sub-TLV。
此外，Member Link attribute sub-TLV字段还可以携带网络接口的标识。例如，Member Link attribute sub-TLV字段包括本地接口标识(local interface ID)sub-TLV字段，用于携带网络接口的索引。Member Link attribute sub-TLV字段还可以携带local interface IPv6address字段，用于携带网络接口的IPv6地址。
当第一报文为BGP报文时，变化后的状态信息以及所述第一网络切片的切片标识携带在所述BGP报文的链路状态(Link-State)网络层可达信息(Network Layer Reachability Information，NLRI)字段中。参见图6，该图为Link-State NLRI字段的格式示意图。在该图中，Link-State NLRI字段包括协议号(protocol-ID)字段、标识字段(Identifier)字段(64bits)、本地节点描述符(Local Node Descriptors)字段、远端节点描述符(Remote Node Descriptors)字段和链路描述符(Link Descriptors)字段。其中，Local Node Descriptors字段、Remote Node Descriptors字段和Link Descriptors字段是可选的(variable)。
Link Descriptors字段包括Link Local Identifier字段，用于携带网络接口的标识。在本申请实施例中，Link Descriptors字段中还可以包括图3所示的sub-TLV字段，用于携带网络接口的变化后状态信息以及第一网络切片的切片标识。
S204：目标设备接收来自第一网络设备的第一报文。
S205：目标设备根据所述网络接口的变化后的状态信息对转发路径进行处理。
在本申请实施例中，当目标设备具备对转发路径的处理能力时，例如目标设备为控制设备或具有算路能力的边缘网络设备，那么目标设备可以根据第一报文中携带的网络接口的变化后的状态信息对转发路径进行处理，其中，所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。
在本申请实施例中，变化后的状态信息指示的内容不同，目标设备对转发路径进行处理的方式也不同。
当所述变化后的状态信息指示所述网络接口删除配置所述第一网络切片，或，所述变化后的状态信息指示所述网络接口从正常状态变化为故障状态时，所述目标设备可以查找预先存储的与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径的路径信息，并且删除所述转发路径的路径信息或将所述转发路径的路径信息置为无效。并且，在删除该转发路径的路径信息或将该转发路径的路径信息置为无效之后，目标设备还需要通知该转发路径所经过的除第一网络设备以外的其他网络设备，以避免通过该转发路径转发报文，造成报文丢失的问题。
或者，当目标设备查找到与所述网络接口的标识和所述第一网络切片的切片标识对应 的转发路径的路径信息之后，所述目标设备根据属于所述第一网络切片的除所述网络接口以外的其他网络接口重新计算与所述第一网络切片的切片标识对应的转发路径。并且，目标设备可以将重新计算得到的转发路径的转发信息下发给该转发路径上的网络设备，以实现通过传输正常的转发路径转发第一网络切片的报文的目的。
当所述变化后的状态信息指示所述网络接口新增配置所述第一网络切片，所述目标设备生成与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，并存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系。目标设备还可以向该转发路径上的网络设备下发转发路径的转发信息，以通过该转发路径转发第一网络切片的报文。
若在网络接口处于故障状态时，目标设备删除了与该网络接口的标识和第一网络切片的切片标识对应的转发路径的路径信息，那么当所述变化后的状态信息指示所述网络接口从故障状态恢复为正常状态时，目标设备可以重新生成该转发路径，并存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系。若网络接口在处于故障状态时，目标设备将与该网络接口的标识和第一网络切片的切片标识对应的转发路径的路径信息置为无效，那么当所述变化后的状态信息指示所述网络接口从故障状态恢复为正常状态时，目标设备可以将该与该网络接口的标识和第一网络切片的切片标识对应的转发路径的路径信息置为有效。在重新生成该转发路径或将路径信息置为有效之后，目标设备可以通知该转发路径上的网络设备，以使该转发路径能够转发第一网络切片的报文。
当第一网络设备与目标设备之间并非直连，即二者之间还连接有其他网络设备，那么，这些网络设备可以对第一报文进行转发，以使目标设备能够接收到该第一报文，并执行后续步骤。
相对于传统技术周期性的发布网络接口及配置的网络切片的信息的方案，本申请实施例只在第一网络设备的网络接口的状态信息发生变化时，才向目标设备发布携带该网络接口的变化后的状态信息、该网络接口的标识以及对应的第一网络切片的切片标识的第一报文，减少报文发布的数量，且不需要等到周期计时结束时发布，节约了发布时间，提高了目标设备的处理效率。
下面以图1为例介绍如何检查出未配置与网络接口对应的网络切片，以及与网络接口的标识和第一网络切片的切片标识对应的转发路径如何生成。
在本申请实施例中，控制设备201可以向与其通信的网络设备101、网络设备102、网络设备103和网络设备104分别下发对应的切片实例信息，该切片实例信息包括灵活算法(flexible algorithm，FA)的FA标识(identification，ID)和网络切片的切片标识之间的对应关系。其中，FA ID用于标识灵活算法的算法约束条件。该切片实例信息还可以包括与FA ID对应的算法约束条件，以使与控制设备201通信的上述网络设备获取到上述信息并进行存储。在一些示例中，算法约束条件还可以直接配置在上述网络设备中，即控制设备201仅下发FA ID与切片标识之间的对应关系，而不下发与FA ID对应的算法约束条件。
其中，灵活算法的算法约束条件例如包括度量值类型(metric type)、计算类型 (calculation type)和链路属性等。
其中，度量值类型包括三种：metric type＝0表示IGP度量值；metric type＝1表示最小单项链路延迟(link delay)，具体请参见RFC7810协议；metric type＝2表示流量工程度量值，具体请参见RFC5305协议。
计算类型包括两种：calculation type＝0表示最短路径优先(shortest path first，SPF)；calculation type＝1表示严格最短路径优先(strict SPF)。
链路属性用颜色(color)来表示，不同的链路属性对应不同的颜色。链路属性相同的网络设备组成一个网络拓扑结构，基于该网络拓扑结构来计算对应的转发路径。
约束条件还可以包括：
排除管理组(Exclude Admin Group)：指定链路管理组不能包含任何一个引用的亲和属性名称，不满足的链路将被排除，不能参与算路。
包括任意一个管理组(Include-Any Admin Group)：指定链路管理组只要包含一个引用的亲和属性名称，该链路就可以参与算路。
包括全部管理组(Include-All Admin Group)：指定链路管理组要包含所有引用的亲和属性名称，不满足的链路将被排除，不能参与算路。
例如，控制设备201向网络设备101、网络设备102、网络设备103和网络设备104分别发送FA ID 128和网络切片1的切片标识的对应关系，以及FA ID 129和网络切片2的切片标识的对应关系。
假设网络切片1，用于传输高带宽业务的报文，对应的算法约束条件为：
metric type：IGP Metric；
calculation type：SPF；
Exclude Admin Group：红。
网络切片2，用于传输低延时业务的报文，对应的算法约束条件为：
metric type：IGP Metric；
calculation type：SPF；
Include-Any Admin Group：蓝。
若控制设备201下发的切片实例信息包括算法约束条件，且不同的切片ID对应多个算法约束条件时，网络设备可以算法约束条件的优先级选择一个与该切片ID对应的算法约束条件。
控制设备201还向与其通信的网络设备104分别下发对应的接口集合和网络切片的切片标识的对应关系。
例如，控制设备201向网络设备101发送接口集合A和网络切片1的切片标识的对应关系，以及接口集合B和网络切片2的切片标识的对应关系，其中接口集合A和接口集合B分别包括网络设备101的一个或多个网络接口。
网络设备根据网络切片对应的算法约束条件确定满足该算法约束条件的接口集合。
例如，网络设备101根据网络切片1对应的算法约束条件确定满足该算法约束条件的接口集合为接口集合A’。网络设备101根据网络切片2对应的算法约束条件确定满足该算 法约束条件的接口集合为接口集合B’。
网络设备比对控制设备201下发的与网络切片对应的接口集合以及根据该网络切片的算法约束条件确定的接口集合，若根据算法约束条件确定的接口集合中有一个或多个接口不在下发的接口集合中，说明该一个或多个接口没有被配置网络切片。
例如，假设网络设备101确定的与网络切片1对应的接口集合A’包括接口1的子接口a以及接口2的子接口b，控制设备201下发的与网络切片1对应的接口集合A包括接口1的子接口a以及接口2的子接口b，可见接口集合A’全部包含于接口集合A，说明接口1的子接口a以及接口2的子接口b均配置了网络切片1。
假设网络设备101确定的与网络切片2对应的接口集合B’包括接口1的子接口c和及接口2的子接口d，而控制设备201下发的与网络切片2对应的接口集合B包括接口1的子接口c，由于接口集合B’中接口1的子接口c包含于接口集合B，且接口集合B’中接口2的子接口d未包含于接口集合B，说明接口1的子接口c配置了网络切片2，接口2的子接口d未配置网络切片2。
基于上文介绍，当网络设备的某个网络接口从配置有网络切片变为未配置网络切片，那么则可以发布第一报文。
例如，当网络设备101的接口2的子接口d从之前配置有网络切片2，到因为各种原因而删除配置网络切片2，则可以发布第一报文，该第一报文中可以携带接口2的子接口d的标识、网络切片2的切片标识以及变化后的状态信息，该变化后的状态信息用于指示该子接口d删除配置了网络切片2。
控制设备201在知晓各网络设备的网络接口配置了哪些对应的网络切片之后，可以计算出配置有相同的网络切片的转发路径，并存储该转发路径的路径信息、网络接口的标识以及网络切片的标识之间的对应关系。并且，控制设备201可以将该路径信息下发给对应的网络设备，以实现通过该转发路径转发属于该网络切片的报文的目的。具体的，控制设备201可以下发段路由(Segment Routing)策略(policy)或IPv6段路由(Segment Routing IPv6，SRv6)策略，其中携带有路径信息，该路径信息可以体现为段标识(Segment Identifier，SID)列表(list)。
例如，控制设备201计算出的与网络切片1对应的转发路径为网络设备101-网络设备102-网络设备104，那么控制设备201可以存储该转发路径的SID list、网络设备101的子接口a以及网络切片1的对应关系，并将该SID list下发给网络设备101，以使网络设备101根据该SID list生成对应的转发表，该转发表的出接口为该子接口a。基于该转发表，网络设备101可以将报文通过子接口a转发给网络设备102。
参见图7，本申请实施例还提供了一种报文发布装置700，该报文发布装置700可以实现图2所示实施例中第一网络设备的功能。该报文发布装置700包括处理单元701和发送单元702。其中，处理单元701用于实现图2所示实施例中的S201和S202；发送单元702用于实现图2所示实施例中的S203。
具体的，处理单元701，用于获取网络接口的状态信息，响应于所述网络接口的状态信息发生变化，生成第一报文，所述第一报文中携带所述网络接口的标识、变化后的状态 信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态。
发送单元702，用于发布所述第一报文。
具体执行过程请参考上述图2所示实施例中相应步骤的详细描述，这里不再一一赘述。
参见图8，本申请实施例还提供了一种转发路径处理装置800，该转发路径处理装置800可以实现图2所示实施例中目标设备的功能。该转发路径处理装置800包括接收单元801和处理单元802。其中，接收单元801用于实现图2所示实施例中的S204；处理单元802用于实现图2所示实施例中的S205。
具体的，接收单元801，用于接收来自第一网络设备的第一报文，所述第一报文中携带所述网络接口的标识、所述网络接口的变化后的状态信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态。
处理单元802，用于根据所述变化后的状态信息对转发路径进行处理，所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。
具体执行过程请参考上述图2所示实施例中相应步骤的详细描述，这里不再一一赘述。
需要说明的是，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。本申请实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。例如，上述实施例中，获取单元和处理单元可以是同一个单元，也不同的单元。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
图9是本申请实施例提供的一种设备900的结构示意图。上文中的报文发布装置700或转发路径处理装置800可以通过图9所示的设备来实现。参见图9，该设备900包括至少一个处理器901，通信总线902以及至少一个网络接口904，可选地，该设备900还可以包括存储器903。
处理器901可以是中央处理器(central processing unit，CPU)，网络处理器(network processor，NP)或者CPU和NP的组合。在一种实现方式中，处理器901还可为流量管理(traffic management，TM)芯片或者是集成了NP和TM芯片的硬件，TM芯片或者集成了NP和TM芯片的硬件可对TM芯片中的队列执行本申请实施例提供的调度队列的方法。处理器1010还可以进一步包括硬件芯片。上述硬件芯片可以是专用集成电路(application-specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)或其组合。上述PLD可以是复杂可编程逻辑器件(complex programmable logic device，CPLD)，现场可编程逻辑门阵列(field-programmable gate array，FPGA)，通用阵列逻辑(generic array logic,GAL)或其任意组合。处理器可以用于对数据报文进行更新或校验，以实现本申请实施例中提供的报文传输方法。
比如，当图2中的第一网络设备通过图9所示的设备来实现时，该处理器可以用于：获取网络接口的状态信息，响应于所述网络接口的状态信息发生变化，生成第一报文，发布所述第一报文。当图2中的目标设备通过图9所示的设备来实现时，该处理器可以用于：接收来自第一网络设备的第一报文，根据所述变化后的状态信息对转发路径进行处理。
通信总线902用于在处理器901、网络接口904和存储器903之间传送信息。总线系统902可以是外设部件互连标准(peripheral component interconnect，PCI)总线或扩展工业标准结构(extended industry standard architecture，EISA)总线等。总线系统902可以分为地址总线、数据总线、控制总线等，图9中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
存储器903可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其它类型的静态存储设备，存储器903还可以是随机存取存储器(random access memory，RAM)或者可存储信息和指令的其它类型的动态存储设备，也可以是只读光盘(compact disc read-only Memory，CD-ROM)或其它光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其它磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其它介质，但不限于此。存储器903可以是独立存在，通过通信总线902与处理器901相连接。存储器903也可以和处理器901集成在一起。
可选地，存储器903用于存储执行本申请方案的程序代码或指令，并由处理器901来控制执行。处理器901用于执行存储器903中存储的程序代码或指令。程序代码中可以包括一个或多个软件模块。可选地，处理器901也可以存储执行本申请方案的程序代码或指令，在这种情况下处理器901不需要到存储器903中读取程序代码或指令。
网络接口904可以为收发器一类的装置，用于与其它设备或通信网络通信，通信网络可以为以太网、无线接入网(RAN)或无线局域网(wireless local area networks，WLAN)等。在本申请实施例中，网络接口904可以用于接收分段路由网络中的其他节点发送的报文，也可以向分段路由网络中的其他节点发送报文。网络接口904可以为以太接口(ethernet)接口、快速以太(fast ethernet，FE)接口或千兆以太(gigabit ethernet，GE)接口等。
在具体实现中，作为一种实施例，设备900可以包括多个处理器，例如图9中所示的处理器901和处理器905。这些处理器中的每一个可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
图10是本申请实施例提供的一种设备1000的结构示意图。图2中的第一网络设备和目标设备中任意一个或多个设备可以通过图10所示的设备来实现。
参见图10所示的设备结构示意图，设备1000包括主控板和一个或多个接口板。主控板与接口板通信连接。主控板也称为主处理单元(main processing unit，MPU)或路由处理卡(route processor card)，主控板包括CPU和存储器，主控板负责对设备1000中各个组件的控制和管理，包括路由计算、设备管理和维护功能。接口板也称为线处理单元(line processing unit，LPU)或线卡(line card)，用于接收和发送报文。在一些实施例中，主控板与接口板之间或接口板与接口板之间通过总线通信。在一些实施例中，接口板之间通过交换网板通信，在这种情况下设备1000也包括交换网板，交换网板与主控板、接口板通信连接，交换网板用于转发接口板之间的数据，交换网板也可以称为交换网板单元(switch fabric unit，SFU)。接口板包括CPU、存储器、转发引擎和接口卡(interface card，IC)，其 中接口卡可以包括一个或多个网络接口。网络接口可以为Ethernet接口、FE接口或GE接口等。CPU与存储器、转发引擎和接口卡分别通信连接。存储器用于存储转发表。转发引擎用于基于存储器中保存的转发表转发接收到的报文，如果接收到的报文的目的地址为设备700的IP地址，则将该报文发送给主控板或接口板的CPU进行处理；如果接收到的报文的目的地址不是设备1000的IP地址，则根据该目的地查转发表，如果从转发表中查找到该目的地址对应的下一跳和出接口，将该报文转发到该目的地址对应的出接口。转发引擎可以是网络处理器(network processor，NP)。接口卡也称为子卡，可安装在接口板上，负责将光电信号转换为数据帧，并对数据帧进行合法性检查后转发给转发引擎处理或接口板CPU。在一些实施例中，CPU也可执行转发引擎的功能，比如基于通用CPU实现软转发，从而接口板中不需要转发引擎。在一些实施例中，转发引擎可以通过ASIC或现场可编程门阵列(field programmable gate array，FPGA)实现。在一些实施例中，存储转发表的存储器也可以集成到转发引擎中，作为转发引擎的一部分。
本申请实施例还提供一种芯片系统，包括：处理器，所述处理器与存储器耦合，所述存储器用于存储程序或指令，当所述程序或指令被所述处理器执行时，使得该芯片系统实现上述图2所示实施例中提供的报文传输方法。
可选地，该芯片系统中的处理器可以为一个或多个。该处理器可以通过硬件实现也可以通过软件实现。当通过硬件实现时，该处理器可以是逻辑电路、集成电路等。当通过软件实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现。
可选地，该芯片系统中的存储器也可以为一个或多个。该存储器可以与处理器集成在一起，也可以和处理器分离设置，本申请并不限定。示例性的，存储器可以是非瞬时性处理器，例如只读存储器ROM，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请对存储器的类型，以及存储器与处理器的设置方式不作具体限定。
示例性的，该芯片系统可以是FPGA，可以是ASIC，还可以是系统芯片(system on chip，SoC)，还可以是CPU，还可以是NP，还可以是数字信号处理电路(digital signal processor，DSP)，还可以是微控制器(micro controller unit，MCU)，还可以是可编程控制器(programmable logic device，PLD)或其他集成芯片。
应理解，上述方法实施例中的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
本申请实施例还提供了一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行以上方法实施例提供的、由第一网络设备执行的报文发布方法，或由目标设备执行的转发路径处理方法。
本申请实施例还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行以上方法实施例提供的、由第一网络设备执行的报文发布方法，或由目标设备执行的转发路径处理方法。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理 解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑模块划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要获取其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各模块单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件模块单元的形式实现。
所述集成的单元如果以软件模块单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述 各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (49)

  1. 一种报文发布方法，其特征在于，所述方法包括：
    第一网络设备获取网络接口的状态信息；
    响应于所述网络接口的状态信息发生变化，所述第一网络设备生成第一报文，所述第一报文中携带所述网络接口的标识、变化后的状态信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态；
    所述第一网络设备发布所述第一报文。
  2. 根据权利要求1所述的方法，其特征在于，响应于所述网络接口的状态信息发生变化，所述第一网络设备生成第一报文，包括：
    响应于所述网络接口删除配置所述第一网络切片，所述第一网络设备生成第一报文；或，
    响应于所述网络接口新增配置所述第一网络切片，所述第一网络设备生成第一报文。
  3. 根据权利要求1所述的方法，其特征在于，响应于所述网络接口的状态信息发生变化，所述第一网络设备生成第一报文，包括：
    响应于所述网络接口从正常状态变化为故障状态，所述第一网络设备获取所述第一网络切片的切片标识，并根据所述第一网络切片的切片标识生成第一报文。
  4. 根据权利要求1所述的方法，其特征在于，响应于所述网络接口的状态信息发生变化，所述第一网络设备生成第一报文，包括：
    响应于所述网络接口从故障状态恢复为正常状态，所述第一网络设备获取所述第一网络切片的切片标识，并根据所述第一网络切片的切片标识生成第一报文。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述第一报文为中间系统到中间系统ISIS报文、开放式最短路径优先OSPF报文或边界网关协议BGP报文。
  6. 根据权利要求5所述的方法，其特征在于，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述ISIS报文或所述OSPF报文的二层捆绑成员属性L2 Bundle Member Attributes类型长度值TLV字段中。
  7. 根据权利要求6所述的方法，其特征在于，所述ISIS报文的L2 Bundle Member Attributes TLV字段包括二层捆绑属性描述L2 Bundle Attribute Descriptors字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述L2 Bundle Attribute Descriptors字段中。
  8. 根据权利要求6所述的方法，其特征在于，所述OSPF报文的L2 Bundle Member Attributes TLV字段包括成员链路属性Member Link attribute子类型长度值sub-TLV字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Member Link attribute sub-TLV字段中。
  9. 根据权利要求6所述的方法，其特征在于，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述BGP报文的链路状态Link-State网络层可达信息NLRI字段中。
  10. 根据权利要求9所述的方法，其特征在于，所述Link-State NLRI字段包括链路描述 符Link Descriptors字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Link Descriptors字段中。
  11. 根据权利要求1-10任一项所述的方法，其特征在于，所述第一报文用于根据所述网络接口的变化后的状态信息对转发路径进行处理，所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。
  12. 根据权利要求1-11任一项所述的方法，其特征在于，所述第一网络设备发布所述第一报文，包括：
    所述第一网络设备向控制设备或第二网络设备发布所述第一报文。
  13. 一种转发路径处理方法，其特征在于，所述方法包括：
    目标设备接收来自第一网络设备的第一报文，所述第一报文中携带所述网络接口的标识、所述网络接口的变化后的状态信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态；
    所述目标设备根据所述变化后的状态信息对转发路径进行处理，所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。
  14. 根据权利要求13所述的方法，其特征在于，所述目标设备根据所述变化后的状态信息对转发路径进行处理包括：
    响应于所述变化后的状态信息指示所述网络接口删除配置所述第一网络切片，或，响应于所述变化后的状态信息指示所述网络接口从正常状态变化为故障状态，所述目标设备查找与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径的路径信息；
    所述目标设备删除所述转发路径的路径信息或将所述转发路径的路径信息置为无效；或，所述目标设备根据属于所述第一网络切片的除所述网络接口以外的其他网络接口重新计算与所述第一网络切片的切片标识对应的转发路径。
  15. 根据权利要求13所述的方法，其特征在于，所述目标设备根据所述网络接口的状态信息对转发路径进行处理包括：
    响应于所述变化后的状态信息指示所述网络接口新增配置所述第一网络切片，所述目标设备生成与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，并存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系。
  16. 根据权利要求13所述的方法，其特征在于，所述目标设备根据所述网络接口的状态信息对转发路径进行处理包括：
    响应于所述变化后的状态信息指示所述网络接口从故障状态恢复为正常状态，所述目标设备生成与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，并存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系；或，所述目标设备将与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径的转发信息置为有效。
  17. 根据权利要求13-16任一项所述的方法，其特征在于，所述第一报文为中间系统到中间系统ISIS报文、开放式最短路径优先OSPF报文或边界网关协议BGP报文。
  18. 根据权利要求17所述的方法，其特征在于，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述ISIS报文或所述OSPF报文的二层捆绑成员属性L2 Bundle Member Attributes类型长度值TLV字段中。
  19. 根据权利要求18所述的方法，其特征在于，所述ISIS报文的L2 Bundle Member Attributes TLV字段包括二层捆绑属性描述L2 Bundle Attribute Descriptors字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述L2 Bundle Attribute Descriptors字段中。
  20. 根据权利要求18所述的方法，其特征在于，所述OSPF报文的L2 Bundle Member Attributes TLV字段包括成员链路属性Member Link attribute子类型长度值sub-TLV字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Member Link attribute sub-TLV字段中。
  21. 根据权利要求18所述的方法，其特征在于，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述BGP报文的链路状态Link-State网络层可达信息NLRI字段中。
  22. 根据权利要求21所述的方法，其特征在于，所述Link-State NLRI字段包括链路描述符Link Descriptors字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Link Descriptors字段中。
  23. 根据权利要求13-22任一项所述的方法，其特征在于，所述目标设备为控制设备或第二网络设备。
  24. 一种报文发布装置，其特征在于，应用于第一网络设备，所述装置包括：
    处理单元，用于获取网络接口的状态信息；
    所述处理单元，还用于响应于所述网络接口的状态信息发生变化，生成第一报文，所述第一报文中携带所述网络接口的标识、变化后的状态信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态；
    发送单元，用于发布所述第一报文。
  25. 根据权利要求24所述的装置，其特征在于，响应于所述网络接口的状态信息发生变化，所述处理单元生成第一报文，包括：
    响应于所述网络接口删除配置所述第一网络切片，所述处理单元生成第一报文；或，
    响应于所述网络接口新增配置所述第一网络切片，所述处理单元生成第一报文。
  26. 根据权利要求24所述的装置，其特征在于，响应于所述网络接口的状态信息发生变化，所述处理单元生成第一报文，包括：
    响应于所述网络接口从正常状态变化为故障状态，所述处理单元获取所述第一网络切片的切片标识，并根据所述第一网络切片的切片标识生成第一报文。
  27. 根据权利要求24所述的装置，其特征在于，响应于所述网络接口的状态信息发生变化，所述处理单元生成第一报文，包括：
    响应于所述网络接口从故障状态恢复为正常状态，所述处理单元获取所述第一网络切片的切片标识，并根据所述第一网络切片的切片标识生成第一报文。
  28. 根据权利要求24-27任一项所述的装置，其特征在于，所述第一报文为中间系统到中间系统ISIS报文、开放式最短路径优先OSPF报文或边界网关协议BGP报文。
  29. 根据权利要求28所述的装置，其特征在于，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述ISIS报文或所述OSPF报文的二层捆绑成员属性L2 Bundle Member Attributes类型长度值TLV字段中。
  30. 根据权利要求29所述的装置，其特征在于，所述ISIS报文的L2 Bundle Member Attributes TLV字段包括二层捆绑属性描述L2 Bundle Attribute Descriptors字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述L2 Bundle Attribute Descriptors字段中。
  31. 根据权利要求29所述的装置，其特征在于，所述OSPF报文的L2 Bundle Member Attributes TLV字段包括成员链路属性Member Link attribute子类型长度值sub-TLV字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Member Link attribute sub-TLV字段中。
  32. 根据权利要求29所述的装置，其特征在于，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述BGP报文的链路状态Link-State网络层可达信息NLRI字段中。
  33. 根据权利要求32所述的装置，其特征在于，所述Link-State NLRI字段包括链路描述符Link Descriptors字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Link Descriptors字段中。
  34. 根据权利要求24-33任一项所述的装置，其特征在于，所述第一报文用于根据所述网络接口的变化后的状态信息对转发路径进行处理，所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。
  35. 根据权利要求24-34任一项所述的装置，其特征在于，
    所述发送单元，用于向控制设备或第二网络设备发布所述第一报文。
  36. 一种转发路径处理装置，其特征在于，应用于目标设备，所述装置包括：
    接收单元，用于接收来自第一网络设备的第一报文，所述第一报文中携带所述网络接口的标识、所述网络接口的变化后的状态信息以及第一网络切片的切片标识，所述变化后的状态信息指示属于所述第一网络切片的所述网络接口的变化后的状态；
    处理单元，用于根据所述变化后的状态信息对转发路径进行处理，所述转发路径为与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径。
  37. 根据权利要求36所述的装置，其特征在于，
    所述处理单元，用于响应于所述变化后的状态信息指示所述网络接口删除配置所述第一网络切片，或，响应于所述变化后的状态信息指示所述网络接口从正常状态变化为故障状态，查找与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径的路径信息；
    所述处理单元，还用于删除所述转发路径的路径信息或将所述转发路径的路径信息置为无效；或，根据属于所述第一网络切片的除所述网络接口以外的其他网络接口重新计算 与所述第一网络切片的切片标识对应的转发路径。
  38. 根据权利要求36所述的装置，其特征在于，
    所述处理单元，用于响应于所述变化后的状态信息指示所述网络接口新增配置所述第一网络切片，生成与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，并存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系。
  39. 根据权利要求36所述的装置，其特征在于，
    所述处理单元，用于响应于所述变化后的状态信息指示所述网络接口从故障状态恢复为正常状态，生成与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径，并存储所述网络接口的标识、所述第一网络切片的切片标识与所述转发路径的路径信息之间的对应关系；或，将与所述网络接口的标识和所述第一网络切片的切片标识对应的转发路径的转发信息置为有效。
  40. 根据权利要求36-39任一项所述的装置，其特征在于，所述第一报文为中间系统到中间系统ISIS报文、开放式最短路径优先OSPF报文或边界网关协议BGP报文。
  41. 根据权利要求40所述的装置，其特征在于，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述ISIS报文或所述OSPF报文的二层捆绑成员属性L2 Bundle Member Attributes类型长度值TLV字段中。
  42. 根据权利要求41所述的装置，其特征在于，所述ISIS报文的L2 Bundle Member Attributes TLV字段包括二层捆绑属性描述L2 Bundle Attribute Descriptors字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述L2 Bundle Attribute Descriptors字段中。
  43. 根据权利要求41所述的装置，其特征在于，所述OSPF报文的L2 Bundle Member Attributes TLV字段包括成员链路属性Member Link attribute子类型长度值sub-TLV字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Member Link attribute sub-TLV字段中。
  44. 根据权利要求41所述的装置，其特征在于，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述BGP报文的链路状态Link-State网络层可达信息NLRI字段中。
  45. 根据权利要求44所述的装置，其特征在于，所述Link-State NLRI字段包括链路描述符Link Descriptors字段，所述变化后的状态信息以及所述第一网络切片的切片标识携带在所述Link Descriptors字段中。
  46. 根据权利要求36-45任一项所述的装置，其特征在于，所述目标设备为控制设备或第二网络设备。
  47. 一种网络设备，其特征在于，所述网络设备包括处理器芯片和存储器，存储器用于存储指令或程序代码，处理器芯片用于从存储器中调用并运行所述指令或程序代码，以执行如权利要求1-12任一项所述的报文发布方法。
  48. 一种设备，其特征在于，所述设备包括处理器芯片和存储器，存储器用于存储指令 或程序代码，处理器芯片用于从存储器中调用并运行所述指令或程序代码，以执行如权利要求13-23任一项所述的转发路径处理方法。
  49. 一种计算机可读存储介质，其特征在于，包括指令、程序或代码，当其在计算机上执行时，使得所述计算机执行如权利要求1-12任一项所述的报文发布方法或如权利要求13-23任一项所述的转发路径处理方法。
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