CN115529114A

CN115529114A - Information transmission method and related equipment

Info

Publication number: CN115529114A
Application number: CN202110716224.2A
Authority: CN
Inventors: 黎文岩; 王海波; 王丽丽; 李磊; 许福太
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2022-12-27
Also published as: WO2022267969A1

Abstract

The embodiment of the application discloses an information transmission method, which is applied to a process that a controller issues SR Policy to a network node, can be realized on the controller and the network node, and specifically comprises the following steps: the controller obtains SR Policy which needs to be issued, wherein the SR Policy comprises SR Policy routing attributes and at least two candidate paths, and then the controller sets an indication identifier in a target message with the SR Policy routing attributes, so that after the network node receives the target message, the SR Policy routing attributes can be determined to be routing attributes for the at least two candidate paths according to the indication identifier, that is, the controller can individually issue routing attributes shared by the at least two candidate paths under the SRpolicy.

Description

Information transmission method and related equipment

Technical Field

The embodiment of the application relates to the field of communication, in particular to an information transmission method and related equipment.

Background

Segment routing Policy (SR Policy) is a new tunnel drainage technology developed on the basis of Segment Routing (SR) technology, where SR Policy includes one or more candidate paths (candidate paths), where the candidate path with the highest priority takes effect, and each candidate path also includes one or more segment lists (segment list) composed of segment identifiers (segment IDs, SIDs) inside, where the segment identifiers specify transmission paths of messages from source to destination, and may indicate that the messages are transmitted in network nodes along the specified paths.

A method for issuing SR Policy to a network node through a Border Gateway Protocol (BGP) SR Policy address family is described in detail in the draft-ietf-idr-segment-routing-te-Policy draft protocol, and specifically, a new BGP sub-address family identifier (SAFI) Network Layer Reachability Information (NLRI) is defined, where the Network Layer Reachability Information (NLRI) is used to issue a candidate path in SR Policy, that is, SR Policy is issued based on the candidate path.

However, in the actual application process of SR Policy, the network node further needs to use an SR Policy routing attribute based on an SR Policy entity, where the SR Policy routing attribute may refer to a routing attribute shared by two or more candidate paths, for example: routing attributes such as BSID (Binding SID) and Bidirectional Forwarding Detection (BFD). If the overall SR Policy routing attributes are still sent down through the candidate paths, each candidate path sharing the overall SR Policy routing attributes repeatedly carries the overall SR Policy routing attributes, and message redundancy is caused. In addition, the SR Policy routing attribute used by the individual candidate path and the overall SR Policy routing attribute may not be the same, which may cause the problem of information collision.

Disclosure of Invention

The embodiment of the application provides an information transmission method, a controller and a network node, which are used for avoiding the problems of message redundancy and information conflict when SR Policy is issued. The embodiment of the application also provides a corresponding server and a computer readable storage medium.

A first aspect of the present application provides an information transmission method, including:

the method comprises the steps that a controller firstly obtains SR Policy, wherein the SR Policy comprises a first SR Policy routing attribute and at least two candidate paths, and the first SR Policy routing attribute is the routing attribute aiming at the at least two candidate paths;

after the controller obtains the SR Policy, a first target packet may be generated, where the first target packet includes a first SR Policy routing attribute and an indication identifier set by the controller, and after the controller sends the target packet to the network node, the network node may determine, according to the indication identifier, that the first SR Policy routing attribute is a routing attribute for at least two candidate paths, that is, the first SR Policy routing attribute is a routing attribute provided for the SR Policy and shared by at least two candidate paths.

In the first aspect, the controller obtains the SR Policy, where the SR Policy includes a first SR Policy routing attribute and at least two candidate paths, and sets an indication identifier in the target packet, so that after receiving the target packet, the network node can determine, according to the indication identifier, that the first SR Policy routing attribute is a routing attribute for the at least two candidate paths, and because the first SR Policy routing attribute is issued alone, the overall routing attributes do not need to be carried repeatedly when the candidate paths of the SR Policy are issued subsequently, thereby avoiding the problems of packet redundancy and information collision.

In a possible implementation manner of the first aspect, the first target packet includes an NLRI type, and the controller adds the NLRI type in the first target packet as an indication identifier.

In this possible implementation manner, the controller may add an NLRI type in the first target packet as the indication identifier, so as to improve the implementability of the scheme.

In a possible implementation manner of the first aspect, the controller may send a first negotiation packet to the network node before sending the first target packet to the network node, and the network node may also send a second negotiation packet to the controller, so that the controller and the network node negotiate with each other whether the controller and the network node have the capability of adding the NLRI type.

In the possible implementation manner, after the controller and the network node have the capability of adding the NLRI type, the controller adds the NLRI type in the first target packet as the indication identifier, so that the problem that the network node cannot determine the purpose of the first SR Policy routing attribute due to failure of setting the indication identifier by the controller when the controller or the network node does not have the capability of adding the NLRI type is avoided, and the feasibility of the scheme is improved.

In a possible implementation manner of the first aspect, the first target packet includes an NLRI type, the NLRI type includes a specifier field, and the controller sets a value of the specifier field in the first target packet as the indication identifier.

In this possible implementation manner, the controller may set a value of the specifier field in the first target message as the indication identifier, so as to improve the implementability of the scheme.

In a possible implementation manner of the first aspect, the SR Policy includes a first SR Policy routing attribute, and the controller may add a first routing sub-attribute having the same level as the first SR Policy routing attribute as the indication identifier in the first target message.

In this possible implementation manner, the controller may add the first route sub-attribute in the first target packet as the indication identifier, so as to improve the implementability of the scheme.

In a possible implementation manner of the first aspect, the first target packet includes a tunnel type field, and the controller may set a value of the tunnel type field in the first target packet as the indication identifier.

In this possible implementation manner, the controller may set a value of the tunnel type field in the first target message as the indication identifier, so as to improve the implementability of the scheme.

In a possible implementation manner of the first aspect, the first target packet does not include a candidate path under SR Policy, that is, the controller issues the first SR Policy routing attribute separately.

In the possible implementation manner, the controller independently issues the first SR Policy routing attributes, and the first SR Policy routing attributes do not need to be carried when the candidate paths of SR policies are subsequently issued, thereby avoiding the problems of message redundancy and information collision.

In a possible implementation manner of the first aspect, the controller further sends a second target packet to the network node, where the second target packet includes a first candidate path of the at least two candidate paths.

In this possible implementation manner, the controller may issue the candidate paths separately, in addition to issuing the first SR Policy routing attribute shared by the at least two candidate paths separately, so that the entire SR Policy completes the issuing, and the integrity of the scheme is improved.

In a possible implementation manner of the first aspect, the second target packet further includes a second SR Policy routing attribute, where the second SR Policy routing attribute is a routing attribute for the first candidate path, and the second SR Policy routing attribute is not for a second candidate path of the at least two candidate paths, that is, the second SR Policy routing attribute is a routing attribute carried under the first candidate path.

In the possible implementation manner, the candidate path also carries the routing attribute, so that the completeness of the scheme is improved.

In a possible implementation manner of the first aspect, before the controller sends the second target packet to the network node, the controller further sets enabling information in the second target packet, and after receiving the second target packet, the network node may determine whether the first candidate path uses the first SR Policy routing attribute according to the enabling information.

In this possible implementation manner, when the candidate path also carries the routing attribute, the controller may set the enabling information in the second target message, so as to control the first candidate path to use the first SR Policy routing attribute, the second SR Policy routing attribute, or not use the routing attribute, and the controller may set different enabling information for different situations, thereby improving the selectivity of the scheme.

In a possible implementation manner of the first aspect, the first candidate path includes a second SR Policy routing attribute, and the controller may add a second routing sub-attribute having the same level as the second SR Policy routing attribute in the second target message as the enabling information.

In this possible implementation manner, the controller may add a second route sub-attribute in the second target message as the enabling information, so as to improve the implementability of the scheme.

In a possible implementation manner of the first aspect, the first target packet is a border gateway protocol packet, that is, the first target packet is a BGP-based packet.

In the possible implementation manner, the communication protocol of the first target message is limited, and the realizability of the scheme is improved.

In a possible implementation manner of the first aspect, the first SR Policy routing attribute includes a Binding SID or bidirectional forwarding detection, that is, the first SR Policy routing attribute may be a BSID, a BFD, a BSID, and a BFD.

In the possible implementation manner, specific contents of the first SR Policy routing attribute are defined, and the implementability of the scheme is improved.

A second aspect of the present application provides an information transmission method, including:

the method comprises the steps that a network node receives a first target message sent by a controller, wherein the first target message comprises a first SR Policy routing attribute and an indication mark set in the first target message by the controller, the first SR Policy routing attribute is contained in SR Policy, the SR Policy further comprises at least two candidate paths, the first SR Policy routing attribute is a routing attribute aiming at the at least two candidate paths, namely the first SR Policy routing attribute is a routing attribute provided for the SR Policy to be shared by the at least two candidate paths;

after receiving the first target packet, the network node may determine, according to the indicator, the route attributes of at least two candidate paths under the SR Policy as the first SR Policy route attribute.

In the second aspect, the network node receives a first target packet sent by the controller, where the first target packet includes a first SR Policy routing attribute and an indication identifier set in the first target packet by the controller, and the network node may determine, according to the indication identifier, that the routing attributes of at least two candidate paths under the SR Policy are the first SR Policy routing attribute, that is, determine the first SR Policy routing attribute as a routing attribute for the at least two candidate paths, and because the first SR Policy routing attribute is received separately, the candidate paths of the subsequently received SR Policy do not need to carry these overall routing attributes repeatedly, thereby avoiding the problems of packet redundancy and information collision.

In a possible implementation manner of the second aspect, the first target packet includes an NLRI type, and the controller adds the NLRI type in the first target packet as an indication identifier. After receiving the first target packet, the network node may determine whether a newly added NLRI type exists in the first target packet, and if the newly added NLRI type exists in the first target packet, the network node may determine that the routing attributes of at least two candidate paths under SR Policy are the first SR Policy routing attributes, that is, determine that the first SR Policy routing attributes are routing attributes for at least two candidate paths.

In this possible implementation manner, the controller may add an NLRI type in the first target packet as the indication identifier, and correspondingly, the network node may determine whether there is an NLRI type added in the first target packet, so as to determine that the routing attributes of at least two candidate paths under SR Policy are the first SR Policy routing attributes, thereby improving the implementability of the scheme.

In a possible implementation manner of the second aspect, before the network node receives the first target packet sent by the controller, the controller sends a first negotiation packet to the network node, and the network node also sends a second negotiation packet to the controller, so that whether the controller and the network node negotiate with each other to have the capability of adding the NLRI type.

In a possible implementation manner of the second aspect, the first target packet includes an NLRI type, the NLRI type includes an specifier field, and the controller sets a value of the specifier field in the first target packet as the indication identifier. After receiving the first target message, the network node can judge whether the value of the specifier field is a first preset value; if the value of the specifier field is a first preset value, the network node determines the routing attributes of at least two candidate paths under the SR Policy as first SR Policy routing attributes, namely determines the first SR Policy routing attributes as routing attributes for at least two candidate paths.

In this possible implementation manner, the controller may set a value of the specifier field in the first target message as the indication identifier, and correspondingly, the network node may determine whether the value of the specifier field in the first target message is the first preset value, so as to determine that the routing attributes of at least two candidate paths under SR Policy are the first SR Policy routing attribute, thereby improving the implementability of the scheme.

In a possible implementation manner of the second aspect, the SR Policy includes a first SR Policy routing attribute, and the controller may add a first routing sub-attribute having the same level as the first SR Policy routing attribute as the indication identifier in the first target message. After receiving the first target message, the network node may determine whether a first route sub-attribute exists in the first target message; if the first target message has the first routing sub-attribute, the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute, that is, determines the first SR Policy routing attribute as the routing attribute for at least two candidate paths.

In this possible implementation manner, the controller may add a first routing sub-attribute in the first target message as the indication identifier, and correspondingly, the network node may determine whether the first routing sub-attribute exists in the first target message, so as to determine that the routing attributes of at least two candidate paths under SR Policy are the first SR Policy routing attribute, thereby improving the implementability of the scheme.

In a possible implementation manner of the second aspect, the first target packet includes a tunnel type field, and the controller may set a value of the tunnel type field in the first target packet as the indication identifier. After receiving the first target message, the network node can judge whether the value of the tunnel type field is a second preset value; if the value of the tunnel type field is the second preset value, the network node determines the routing attributes of at least two candidate paths under the SR Policy to be the first SR Policy routing attribute, namely, determines the first SR Policy routing attribute to be the routing attribute for at least two candidate paths.

In this possible implementation manner, the controller may set a value of the tunnel type field in the first target packet as the indication identifier, and correspondingly, the network node may determine whether the value of the tunnel type field is the second preset value, so as to determine that the routing attributes of at least two candidate paths under SR Policy are the first SR Policy routing attribute, thereby improving the implementability of the scheme.

In a possible implementation manner of the second aspect, the first target packet does not include a candidate path under SR Policy, that is, the network node is a first SR Policy routing attribute sent by the separate receiving controller.

In this possible implementation manner, the network node receives the first SR Policy routing attributes issued by the controller separately, and candidate paths of SR policies subsequently received by the network node do not need to carry these first SR Policy routing attributes, thereby avoiding the problems of message redundancy and information collision.

In a possible implementation manner of the second aspect, the network node further receives a second target packet sent by the controller, where the second target packet includes a first candidate path of the at least two candidate paths; after receiving the first target message and the second target message, the network node can acquire a first NLRI type of the first target message and a second NLRI type of the second target message; when the first NLRI type is the same as the second NLRI type, the network node determines that the routing attribute of the first candidate path is the first SR Policy routing attribute, that is, provides the first SR Policy routing attribute for the first candidate path.

In this possible implementation manner, the network node receives the candidate paths issued individually by the controller in addition to the first SR Policy routing attribute shared by at least two candidate paths issued individually by the controller, and associates the routing attributes according to the NLRI types of the first target packet and the second target packet after the first SR Policy routing attribute and the candidate paths are both received, so that the entire SR Policy completes issuing, and the integrity of the scheme is improved.

In a possible implementation manner of the second aspect, the second target packet further includes a second SR Policy routing attribute, where the second SR Policy routing attribute is a routing attribute for the first candidate path, and the second SR Policy routing attribute is not for a second candidate path of the at least two candidate paths, that is, when the network node receives the first SR Policy routing attribute and the first candidate path, and the first candidate path further carries the second SR Policy routing attribute, the network node may determine that the routing attribute of the first candidate path is the first SR Policy routing attribute or the second SR Policy routing attribute.

In this possible implementation manner, when the first candidate path also carries the route attribute, the network node may select the first candidate path to use the second SR Policy route attribute carried by the network node itself or the first SR Policy route attribute issued by the controller alone, so that the selectivity of the scheme is improved.

In a possible implementation manner of the second aspect, the controller sets, in the second target packet, enable information, where the enable information is used to indicate whether the first candidate path uses the first SR Policy routing attribute, and the network node may determine the routing attribute of the first candidate path according to the enable information, that is, the network node may control the candidate path to use the first SR Policy routing attribute, the second SR Policy routing attribute, or not use the routing attribute.

In this possible implementation manner, when the candidate path also carries the route attribute, the network node may control the first candidate path to use the first SR Policy route attribute, the second SR Policy route attribute, or not use the route attribute according to the enable information set in the second target message by the controller, so as to improve the selectivity of the scheme.

In a possible implementation manner of the second aspect, the first candidate path includes a second SR Policy routing attribute, the controller may add a second routing sub-attribute having the same level as the second SR Policy routing attribute in a second target packet as enabling information, where a value of the second routing sub-attribute is used to indicate the routing attribute in the first SR Policy routing attribute, and after receiving the second target packet, the network node may determine whether the second routing sub-attribute exists in the second target packet; if the second target packet has the second route sub-attribute, the network node may determine that the route attribute of the first candidate path does not include the first SR Policy route attribute indicated by the value of the second route sub-attribute, that is, the network node may control the first SR Policy route attribute of the unused portion of the first candidate path.

In this possible implementation manner, the controller may add a second route sub-attribute in the second target packet as the enabling information, and the network node may control the first SR Policy route attribute of the unused portion of the first candidate path, thereby improving the implementability of the scheme.

In a possible implementation manner of the second aspect, the first target packet is a border gateway protocol packet, that is, the first target packet is a BGP-based packet.

In a possible implementation manner of the second aspect, the first SR Policy routing attribute includes a Binding SID or bidirectional forwarding detection, that is, the first SR Policy routing attribute may be a BSID, a BFD, a BSID, and a BFD.

A third aspect of the present application provides a controller comprising:

the device comprises an acquisition unit, a routing unit and a routing unit, wherein the acquisition unit is used for acquiring a segment routing Policy (SR Policy), and the SR Policy comprises a first SR Policy routing attribute and at least two candidate paths;

a sending unit, configured to send a first target packet to a network node, where the first target packet includes an indication identifier and the first SR Policy routing attribute, and the indication identifier is used to indicate the network node to determine that the first SR Policy routing attribute is a routing attribute for the at least two candidate paths.

The controller of the third aspect of the present application performs the method of the first aspect of the present application or any possible implementation manner of the first aspect.

A fourth aspect of the present application provides a network node, comprising:

the receiving unit is used for receiving a first target message sent by the controller, wherein the first target message comprises a first SR Policy routing attribute and an indication identifier, and the first SR Policy routing attribute is contained in SR Policy;

and the determining unit is used for determining the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute according to the indication identifier.

The network node of the fourth aspect of the present application performs the method of the second aspect of the present application or any possible implementation of the second aspect.

A fifth aspect of the present application provides a controller comprising:

a processor, a communication interface and a memory for storing program code, the processor being configured to invoke the program code in the memory to cause the controller to perform the method of the first aspect or any possible implementation of the first aspect.

A sixth aspect of the present application provides a network node, comprising:

a processor, a communication interface and a memory for storing program code, the processor being configured to invoke the program code in the memory to cause the network node to perform the method of the second aspect of the present application or any possible implementation of the second aspect.

A seventh aspect of the present application provides a computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method as in the first aspect or any possible implementation manner of the first aspect.

An eighth aspect of the present application provides a computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method as in the second aspect or any possible implementation manner of the second aspect.

A ninth aspect of the present application provides a computer program product storing one or more computer executable instructions that, when executed by a processor, perform a method as described in the first aspect or any one of the possible implementations of the first aspect.

A tenth aspect of the present application provides a computer program product storing one or more computer executable instructions that, when executed by a processor, perform a method as set forth in any one of the possible implementations of the second aspect or the second aspect.

An eleventh aspect of the present application provides a chip system, which includes at least one processor and an interface, where the interface is configured to receive data and/or signals, and the at least one processor is configured to support a computer device to implement the functions recited in the first aspect or any one of the possible implementations of the first aspect. In one possible design, the system-on-chip may further include a memory, storage, for storing necessary program instructions and data for the computer device. The chip system may be constituted by a chip, or may include a chip and other discrete devices.

A twelfth aspect of the present application provides a chip system, which includes at least one processor and an interface, where the interface is configured to receive data and/or signals, and the at least one processor is configured to support a computer device to implement the functions recited in the second aspect or any one of the possible implementations of the second aspect. In one possible design, the system-on-chip may further include a memory, storage, for storing necessary program instructions and data for the computer device. The chip system may be constituted by a chip, or may include a chip and other discrete devices.

Drawings

FIG. 1 is a block diagram of a network node issuing SR Policy in a network;

fig. 2 is a schematic structural diagram of a network node according to an embodiment of the present application;

fig. 3 is another schematic structural diagram of a network node according to an embodiment of the present application;

FIG. 4 is a schematic diagram of SR Policy;

fig. 5 is a schematic diagram of an embodiment of an information transmission method according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of first SR Policy routing information according to an embodiment of the present application;

fig. 7 is a schematic diagram of another embodiment of an information transmission method according to an embodiment of the present application;

fig. 8 is a TLV format diagram of a newly added NLRI type according to an embodiment of the present application;

fig. 9 is another schematic structural diagram of the first SR Policy routing information according to the embodiment of the present application;

fig. 10 is a schematic diagram of another embodiment of an information transmission method according to an embodiment of the present application;

fig. 11A is a schematic structural diagram of a first negotiation packet provided in this embodiment of the present application;

fig. 11B is a TLV format diagram of an optional parameter in the first negotiation message according to an embodiment of the present application;

fig. 12 is a TLV format diagram of another optional parameter in the first negotiation packet according to the embodiment of the present application;

fig. 13 is a schematic diagram of another embodiment of an information transmission method according to an embodiment of the present application;

fig. 14 is a TLV format diagram of NLRI type provided by an embodiment of the present application;

fig. 15 is a schematic diagram of another embodiment of an information transmission method according to an embodiment of the present application;

fig. 16 is another schematic structural diagram of the first SR Policy routing information according to the embodiment of the present application;

fig. 17 is a TLV format diagram of a newly added first route sub-attribute provided by an embodiment of the present application;

fig. 18 is a schematic diagram of another embodiment of an information transmission method according to an embodiment of the present application;

fig. 19 is another schematic structural diagram of the first SR Policy routing information according to the embodiment of the present application;

fig. 20 is a schematic diagram of another embodiment of an information transmission method according to an embodiment of the present application;

fig. 21 is a schematic diagram of another embodiment of an information transmission method according to an embodiment of the present application;

fig. 22 is a schematic diagram of another embodiment of an information transmission method according to an embodiment of the present application;

fig. 23 is a schematic diagram of another embodiment of an information transmission method according to an embodiment of the present application;

fig. 24 is a schematic structural diagram of second SR Policy routing information according to an embodiment of the present application;

fig. 25 is a schematic structural diagram of a controller according to an embodiment of the present application;

fig. 26 is another schematic structural diagram of a controller according to an embodiment of the present application;

fig. 27 is a schematic structural diagram of a network node according to an embodiment of the present application;

fig. 28 is a schematic structural diagram of a network node according to an embodiment of the present application;

fig. 29 is another schematic structural diagram of a controller according to an embodiment of the present application;

fig. 30 is another schematic structural diagram of a network node according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will now be described with reference to the accompanying drawings, and it is to be understood that the described embodiments are merely illustrative of some, but not all, embodiments of the present application. As can be known to those skilled in the art, with the development of technology and the emergence of new scenarios, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.

The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.

The embodiment of the application provides an information transmission method and related equipment, which are used for avoiding the problems of SR Policy message redundancy and information conflict issued by a controller.

Referring to fig. 1, when a user needs to perform traffic optimization on a network, the user may specify a transmission path of a data packet at each network node in the network by using a segment routing Policy (SR Policy). The network may be a routing network, and the network includes a controller and a plurality of network nodes, where the controller is an independent controller, and may specifically be a computer, and the network nodes may be regarded as a forwarding device, and the forwarding device may specifically be a router or a switch.

For example, referring to fig. 2, the network node may include a main control board 210 and an interface board 220, the main control board 210 is connected to the interface board 220, the main control board 210 includes a first processor 211 and a first memory 212, the first processor 211 is connected to the first memory 212, the interface board 220 includes a second processor 221, a second memory 222 and an interface card 223, the second processor 221 is connected to the second memory 222, and the second memory 222 is connected to the interface card 223. The first processor 211 is used for calling the program instructions in the first memory 212 to execute corresponding processing functions, the second processor 221 is used for calling the program instructions in the second memory 222 to execute the receiving and sending of messages, and the interface card 223 is used for connecting with external equipment to receive data.

Illustratively, referring to fig. 3, the network node may include a transceiver 302, a processor 301, a memory 303, and a bus 304. The transceiver 302 is used for receiving and transmitting messages, the memory 303 is used for storing program instructions, and the processor 301 is used for calling the program instructions in the memory 303 to execute corresponding processing functions.

Referring to fig. 1, after receiving a user request, a controller completes collecting network topology according to the user request, specifically, the controller establishes BGP-LS (BGP Link-state) neighbors with one or more network nodes in a network, where the network includes a network node P1, a network node P2, a network node PE1, a network node PE2, a network node PE3, a network node PE4, a network node CE1, and a network node CE2, and when the network node CE2 sends data to the network node CE1, the controller may complete collecting the entire network topology through the network node PE3, so as to calculate SR Policy required by the user, and finally the controller needs to send the SR Policy to each network node to complete deployment of the SR Policy, and data of the network node CE2 is sent to the network node CE1 according to a transmission path specified by the SR Policy. SR Policy may be based on Internet protocol version 4 (Internet protocol version 4, IPv4) or Internet protocol version 6 (Internet protocol version 6, IPv6), and may be represented as SRv Policy or SRv6 Policy.

Referring to the protocol number draft-ietf-idr-segment-routing-te-Policy-13, referring to fig. 4 together, sr Policy includes one or more candidate paths (candidate paths), each candidate path may include a priority (Preference), the highest priority candidate path takes effect, each candidate path may have a routing attribute, the routing attribute of the candidate path may include BSID (Binding SID), policy Name (Policy Name), etc., and may further include Bidirectional Forwarding Detection (BFD), and each candidate path also includes one or more segment lists (segment list) composed of segment identifiers (SID ) and weights (Weight) of the segment lists, the segment identifiers specify transmission paths of the message, and may instruct the message to follow the specified paths to transmit in the network node.

With reference to fig. 5, the following describes an information transmission method in an embodiment of the present application in combination with the SR Policy architecture and an application scenario, where an embodiment of the information transmission method provided in the embodiment of the present application includes:

501. the controller obtains SR Policy.

When a user needs to deploy SR Policy to perform traffic optimization on a network, the controller is responsible for collecting SR Policy required by the user through network topology calculation, where the SR Policy includes a first SR Policy routing attribute and at least two candidate paths, that is, the SR Policy includes at least the first SR Policy routing attribute, the first candidate path, and the second candidate path, and the SR Policy may further include a third candidate path, a fourth candidate path, and the like. Illustratively, the first SR Policy routing attribute includes a Binding SID or a Bidirectional Forwarding Detection (BFD), that is, the first SR Policy routing attribute may include only a Binding SID, only a BFD, and may further include a Binding SID and a BFD, both of which are routing attributes commonly used by all candidate paths under the SR Policy.

502. The controller sends a first target packet to the network node.

Specifically, the controller includes a BGP-based SR Policy address family, and when a network node in the network also includes a BGP-based SR Policy address family, the controller establishes a BGP neighbor with the network node, that is, a BGP SR Policy neighbor, referring to fig. 1 together, where the controller establishes a BGP SR Policy neighbor with a network node PE3, it should be noted that, in this embodiment of the present application, the controller issues SR Policy to one network node as an example, and the step and the method for the controller to issue SR Policy to other network nodes are the same, which is not described in detail in this embodiment of the present application.

The controller may generate a first target packet before or after establishing a BGP neighbor with the network node, where the first target packet is a BGP packet, please refer to protocol number draft-ietf-idr-segment-routing-te-Policy-13, refer to fig. 6 together, the first target packet includes first SR Policy routing information, the first SR Policy routing information includes an attribute (Attributes) and an NLRI type, the attribute includes a first SR Policy routing attribute, the first SR Policy routing attribute includes only a SR Policy-level routing attribute but does not include a candidate path under SR Policy, where the SR Policy-level routing attribute may be understood as a routing attribute used by the entire SR Policy, that is, a routing attribute such as Binding SID, SRv Binding, etc. is a routing attribute provided for all candidate paths under SR SID to be used together.

In addition, the controller also sets an indication identifier in the first target message, where the indication identifier is used to indicate the network node to determine that the first SR Policy routing attribute is a routing attribute for at least two candidate paths, that is, to inform the network node that the first SR Policy routing information is a routing attribute used for being provided to all candidate paths under SR Policy in common. It should be noted that, since the first SR Policy routing attribute does not include the candidate path under SR Policy, the first target packet also does not include the candidate path under SR Policy.

503. And the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute according to the indication identifier.

After receiving the first target packet, the network node may determine, according to the indication identifier in the first target packet, that the route attribute used by the candidate path under the SR Policy is the first SR Policy route attribute, and after the network node subsequently receives the candidate path under the SR Policy sent by the controller, when the network node uses a certain candidate path to forward the data packet, the route attribute used by the candidate path is the first SR Policy route attribute.

In the embodiment of the application, the controller obtains the SR Policy, where the SR Policy includes a first SR Policy routing attribute and at least two candidate paths, and the controller sets the indication identifier in the target packet, so that after receiving the target packet, the network node can determine, according to the indication identifier, that the first SR Policy routing attribute is a routing attribute for the at least two candidate paths, and because the first SR Policy routing attribute is issued alone, the candidate paths of the SR Policy are subsequently issued without carrying the overall routing attributes, thereby avoiding the problems of packet redundancy and information collision.

In the embodiment of the present application, the indication flag set in the first target message by the controller may be in various forms, which are described below:

1. the indication mark is a new network layer reachability information NLRI type:

referring to fig. 7, another embodiment of the information transmission method in the embodiment of the present application includes:

701. the controller obtains SR Policy.

702. The controller sends a first target packet to the network node.

703. And the network node judges whether the first target message has the newly added NLRI type.

704. If the first target message has the newly added NLRI type, the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute.

Referring to fig. 8, the first SR Policy routing information includes a first SR Policy routing attribute and an NLRI type, the controller may add an NLRI type in the first SR Policy routing information, where the added NLRI type includes an NLRI Length (NLRI Length) of 8 bits, a Color (Policy Color) of 32 bits, and an end point (Endpoint) of 32 bits or 128 bits, and refer to fig. 9, and the added NLRI type is represented in the first SR Policy routing information as being composed of a Policy Color and an Endpoint.

After receiving the first target message, the network node may determine whether a newly added NLRI type exists in the first target message, and if the newly added NLRI type exists, determine that a routing attribute used by the candidate path under SR Policy is a first SR Policy routing attribute.

In the embodiment of the application, the controller may add an NLRI type in the first target packet, and after receiving the first target packet, the network node may determine whether the first target packet has the added NLRI type, and if the added NLRI type exists, determine that a routing attribute used by the candidate path under SR Policy is the first SR Policy routing attribute, thereby improving the implementability of the scheme.

Referring to fig. 10, another embodiment of the information transmission method according to the embodiment of the present application includes:

1001. the controller obtains SR Policy.

1002. The controller sends a first negotiation packet to the network node.

1003. And the network node sends a second negotiation message to the controller.

1004. The controller sends a first target packet to the network node.

1005. And the network node judges whether the first target message has the newly added NLRI type.

1006. If the first target message has the newly added NLRI type, the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute.

After the controller and the network node establish the BGP neighbor, the controller and the network node may negotiate with each other to obtain whether the other party has the capability of supporting the newly added NLRI type. Specifically, please refer to protocol number RFC 4271, refer to fig. 11A together, where the first negotiation message is a BGP Open message, the first negotiation message includes an autonomous System (My autonomous System), a Hold Time (Hold Time), a BGP Identifier (BGP Identifier), an Optional Parameter list (Optional Parameters), and the like, each Optional Parameter in the Optional Parameter list is a unit in a TLV (type-Length-Value) format, refer to fig. 11B together, the Optional Parameters include a Parameter type (part.type), a Parameter Length (part.length), and a Parameter Value (Parameter Value), in this embodiment, refer to protocol number RFC 3392, refer to fig. 12, the Optional Parameters include Capability Parameters, the Capability Parameters include an 8-bit Capability Code (Capability Code), an 8-bit Capability Length (Capability Length), and a variable-Length Capability Value (Capability Value), the Capability Parameter includes an 8-bit Capability Value (Capability Length) and a new Capability Value for negotiating, and the Capability Parameter indicates whether the controller has a new Capability coding Value, where the new Capability coding type is set as a new Capability coding Capability Value, and the second negotiation message indicates that the first negotiation message has a Capability coding Capability Value, and the second Capability Value indicates that the Capability negotiation message has a new Capability coding Capability Value, and the second Capability negotiation Value indicating that the second Capability negotiation message has a new Capability coding Capability supporting negotiation Value, where the first negotiation message indicates that a negotiation message.

In the embodiment of the application, after the controller and the network node have the capability of adding the new NLRI type in the mutual negotiation, the controller uses the new NLRI type in the first target message as the indication identifier, so that the problem that the network node cannot determine the purpose of the first SR Policy routing attribute due to failure of setting the indication identifier by the controller when the controller or the network node does not have the capability of adding the new NLRI type is avoided, and the feasibility of the embodiment of the application is improved.

2. Indicating the value identified as the distinguisher field:

referring to fig. 13, another embodiment of the information transmission method in the embodiment of the present application includes:

1301. the controller obtains SR Policy.

1302. The controller sends a first target packet to the network node.

1303. The network node judges whether the value of the specifier field is a first preset value.

1304. If the value of the specifier field is a first preset value, the network node determines the routing attributes of at least two candidate paths under the SR Policy to be first SR Policy routing attributes.

Referring to fig. 14, the first SR Policy routing information includes a first SR Policy routing attribute and an NLRI type, where the NLRI type includes an NLRI Length (NLRI Length) of 8 bits, a discriminator field (distingguiser) of 32 bits, a Color (Policy Color) of 32 bits, and an end point (Endpoint) of 32 bits or 128 bits, where distingguiser is used to distinguish different candidate paths, and the controller may set the indicator to be the value of the discriminator field, for example, set the value of distingguiser to be equal to 0 xfffff FFFF.

After receiving the first target message, the network node may determine a value of a specifier field of an NLRI type in the first target message, and if the value of the specifier field is 0xFFFF FFFF, determine that a routing attribute used by the candidate path under SR Policy is the first SR Policy routing attribute.

In this embodiment of the present application, the controller may set a value of the specifier field in the first target packet as a first preset value, and after receiving the first target packet, the network node may determine whether the value of the specifier field in the first target packet is the first preset value, and if the value of the specifier field is the first preset value, determine that a routing attribute used by the candidate path under the SR Policy is the first SR Policy routing attribute, thereby improving the implementability of the embodiment of the present application.

3. Indicating a first routing sub-attribute identified as a newly added SR Policy:

referring to fig. 15, another embodiment of the information transmission method in the embodiment of the present application includes:

1501. the controller obtains SR Policy.

1502. The controller sends a first target packet to the network node.

1503. The network node judges whether a first routing sub-attribute exists in the first target message;

1504. if the first target message has the first routing sub-attribute, the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute.

Referring to fig. 16, the first SR Policy routing information includes a first SR Policy routing attribute and an NLRI Type, the controller may add a new first routing sub-attribute of SR Policy to the first SR Policy routing attribute, for example, the first SR Policy routing attribute includes a Binding SID, SRv6Binding SID, a Policy Name (Policy Name), and BFD information (BFD Info), which are all routing attributes used by candidate paths under SR Policy, that is, the overall Policy routing attribute at Policy level, and the controller may add a first routing sub-attribute Global Policy to the first SR Policy routing attribute, see fig. 17, the Global id routing includes a Type (Type), a Length (Length), an Identifier (rvid), and a RESERVED block (RESERVED).

After receiving the first target packet, the network node may determine whether a newly added Global Policy Identifier exists in the first SR Policy routing attribute of the first target packet, or determine whether the value of the Global Policy Identifier is 1, and if the newly added Global Policy Identifier exists, or the value of the Global Policy Identifier is 1, determine that the routing attribute used by the candidate path in the SR Policy is the first SR Policy routing attribute.

In this embodiment of the present application, the controller may add a first routing sub-attribute of the SR Policy to the first target packet, and after receiving the first target packet, the network node may determine whether the first routing sub-attribute exists in the first target packet, and if the first routing sub-attribute exists in the first target packet, determine that the routing attribute used by the candidate path in the SR Policy is the first SR Policy routing attribute, thereby improving the implementability of the embodiment of the present application.

4. The indication flag is the value of the tunnel type field:

referring to fig. 18, another embodiment of the information transmission method in the embodiment of the present application includes:

1801. the controller obtains SR Policy.

1802. The controller sends a first target packet to the network node.

1803. The network node judges whether the value of the tunnel type field is a second preset value or not;

1804. and if the value of the tunnel type field is a second preset value, the network node determines the routing attributes of at least two candidate paths under the SR Policy to be first SR Policy routing attributes.

Referring to fig. 19, the first SR Policy routing information includes an NLRI Type and an attribute field (Attributes), where the attribute field (Attributes) includes a Tunnel encapsulation attribute field (Tunnel Encaps Attributes), a Tunnel Type field (Tunnel Type), and a first SR Policy routing attribute, where a value of Tunnel Type is SR Policy, the controller may set a value indicating that the Tunnel Type field is identified, for example, a value of Tunnel Type is Entire SR Policy, after receiving the first target packet, the network node may determine a value of Tunnel Type in the first target packet, and if the value of Tunnel Type is Entire SR Policy, determine that a routing attribute used by a candidate path in SR Policy is the first SR routing attribute.

In this embodiment of the application, the controller may set the tunnel type field in the first target packet as the second preset value, and after receiving the first target packet, the network node may determine whether the tunnel type field in the first target packet is the second preset value, and if the value of the tunnel type field is the second preset value, determine that the routing attribute used by the candidate path under the SR Policy is the first SR Policy routing attribute, thereby improving the implementability of the scheme.

In the embodiment of the application, the controller can set the indication mark in the above four ways, so that the realizability of the embodiment of the application is improved.

In this embodiment, the controller may also issue a second target packet carrying a candidate path in addition to the first target packet to the network node, referring to fig. 20, another embodiment of the information transmission method in this embodiment includes:

2001. the controller obtains SR Policy.

2002. The controller sends a first target packet to the network node.

2003. And the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute according to the indication identifier.

2004. The controller sends a second target packet to the network node.

2005. A network node acquires a first NLRI type of a first target message and a second NLRI type of a second target message;

2006. and when the first NLRI type is the same as the second NLRI type, the network node determines the routing attribute of the first candidate path as a first SR Policy routing attribute.

The SR Policy includes a first SR Policy routing attribute and at least two candidate paths, so that the controller may issue a second target packet carrying the candidate paths in addition to the first target packet to the network node, where the second target packet includes at least one candidate path, that is, a first candidate path of the at least two candidate paths. The network node receives the first target message and the second target message and then can complete the deployment of the SR Policy, wherein the network node uses the first candidate path as a forwarding Policy, and the first candidate path uses the first SR Policy routing attribute as the routing attribute during application. Optionally, the controller may further send a third target packet to the network node, where the third target packet includes a second candidate path of the at least two candidate paths, and at this time, the network node determines a used candidate path according to priorities of the first candidate path and the second candidate path, and both the first candidate path and the second candidate path use the first SR Policy routing attribute as the routing attribute in application. Optionally, if the number of candidate paths is greater than two, the controller may further continue to send a fourth target packet including the third candidate path and a fifth target packet including the fourth candidate path to the network node, and so on.

After receiving a first target message sent by a controller, a network node may determine, according to an indication identifier in the first target message, that the routing attributes of at least two candidate paths under SR Policy are first SR Policy routing attributes, and after receiving the first target message and a second target message sent by the controller, the network node may obtain a first NLRI type of the first target message and a second NLRI type of the second target message, and when the first NLRI type is the same as the second NLRI type, the network node determines that the routing attribute of the first candidate path is the first SR Policy routing attribute. Specifically, the network node obtains a color and an end point in a first NLRI type and a color and an end point in a second NLRI type, when the color and the end point in the first NLRI type are the same as those in the second NLRI type, the network node may determine that the routing attribute of the first candidate path is the first SR Policy routing attribute, thereby completing SR Policy deployment of the first candidate path of the network node, and when the candidate paths of the SR Policy are all issued to each network node, completing SR Policy deployment.

For example, referring to fig. 1, after the network node PE3, the network node P2, and the network node PE1 receive the first target packet and the second target packet sent by the controller, when the network node PE3 receives the data, the data is sequentially transmitted to the network node P2 and the network node PE1 according to the first candidate path and the indication of the first SR Policy routing attribute.

It should be noted that step 2004 may be executed before or after step 2002, and the embodiment of the present application is not limited to this.

In the embodiment of the application, the controller issues the candidate path in addition to issuing the first SR Policy routing attribute to the network node, so that the whole SR Policy is issued, and the integrity of the embodiment of the application is improved.

In the embodiment of the present application, the candidate route sent by the controller also carries a route attribute, please refer to fig. 21, and another embodiment of the information transmission method in the embodiment of the present application includes:

2101. the controller obtains SR Policy.

2102. The controller sends a first target packet to the network node.

2103. And the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute according to the indication identifier.

2104. The controller sends the second target message to the network node.

2105. A network node acquires a first NLRI type of a first target message and a second NLRI type of a second target message;

2106. and when the first NLRI type is the same as the second NLRI type, the network node determines the routing attribute of the first candidate path to be the first SR Policy routing attribute or the second SR Policy routing attribute.

The second SR Policy routing attribute is a routing attribute for the first candidate path, the second SR Policy routing attribute is not for a second candidate path in the at least two candidate paths, that is, the first candidate path itself also carries a routing attribute at a candidate path level, the routing attribute is only used for being provided for the first candidate path, and at this time, after the network node receives the first target packet and the second target packet, and when the first SR Policy routing attribute and the second SR Policy routing attribute conflict, the first candidate path may be selected to use the first SR Policy routing attribute or the second SR Policy routing attribute.

In the embodiment of the application, the candidate paths issued by the controller to the network node also carry the routing attributes, so that the integrity of the embodiment of the application is improved.

In this embodiment of the present application, the controller may further set enabling information in the second target packet before sending the second target packet, referring to fig. 22, another embodiment of the information transmission method in this embodiment of the present application includes:

2201. the controller obtains SR Policy.

2202. The controller sends a first target packet to the network node.

2203. And the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute according to the indication identifier.

2204. The controller sets the enable information in the second target message.

2205. The controller sends the second target message to the network node.

2206. The network node determines a routing attribute of the first candidate path according to the enabling information.

Before the controller sends the second target packet to the network node, the controller may further set enabling information in the second target packet, where the enabling information is used to indicate whether the first candidate path uses the first SR Policy routing attribute, that is, the candidate path under SR Policy may select to use the first SR Policy routing attribute in the first target packet, or may select not to use the first SR Policy routing attribute in the first target packet. When the second target packet does not include the second SR Policy routing attribute, the controller may also set the enable information, so that the first candidate path does not use the first SR Policy routing attribute, and thus does not use the routing attribute. Correspondingly, when the second target packet includes the second SR Policy routing attribute, that is, the first candidate path carries the routing attribute, the controller may set the enabling information, so that the first candidate path uses the first SR Policy routing attribute, but does not use the second SR Policy routing attribute carried by the first candidate path. When the second target packet does not include the second SR Policy routing attribute, the controller may also set the enable information, so that the first candidate path uses the first SR Policy routing attribute.

After receiving the second target packet, the network node may obtain the enabling information in the second target packet, and then determine the routing attribute of the first candidate path according to the enabling information. Illustratively, the enabling information indicates that the first candidate path uses the BFD in the first SR Policy routing attribute, and the second target packet includes the second SR Policy routing attribute, which includes the Binding SID, at this time, the network node sets the routing attribute used by the first candidate path to the BFD in the first SR Policy routing attribute and the Binding SID of the second SR Policy routing attribute. Illustratively, the enabling information indicates that the first candidate path uses a BFD in the first SR Policy routing attribute, and the second target packet includes a second SR Policy routing attribute, which includes the BFD, at this time, the network node sets the routing attribute used by the first candidate path to the BFD in the first SR Policy routing attribute. Illustratively, the enabling information indicates that the first candidate path does not use the first SR Policy routing attribute, and the second target packet includes the second SR Policy routing attribute, at this time, the network node sets the first candidate path to use the second SR Policy routing attribute.

In this embodiment of the present application, the controller may further set, before sending the second target packet, enable information in the second target packet, so that the network node may determine the routing attribute of the first candidate path according to the enable information, where the enable information may be selected according to a user requirement, so that a user may determine whether a certain candidate path in the SR Policy uses a certain routing attribute in the first SR Policy routing attribute, which improves the selectivity of the embodiment of the present application.

In a possible embodiment of the present application, the enabling information is a second route sub-attribute of the newly added first candidate path. Referring to fig. 23, another embodiment of the information transmission method in the embodiment of the present application includes:

2301. the controller obtains SR Policy.

2302. The controller sends a first target packet to the network node.

2303. And the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute according to the indication identifier.

2304. The controller sets the enable information in the second target message.

2305. The controller sends the second target message to the network node.

2306. The network node judges whether a second route sub-attribute exists in the second target message.

2307. If the second target message has the second route sub-attribute, the network node determines that the route attribute of the first candidate path does not include the first SR Policy route attribute indicated by the value of the second route sub-attribute.

Referring to fig. 24, the second target packet includes second SR Policy routing information, where the second SR Policy routing information includes a second SR Policy routing attribute and an NLRI type, and the controller may add a second routing sub-attribute of the first candidate path to the second SR Policy routing attribute, where the second SR Policy routing attribute exemplarily includes routing attributes such as Binding SID, SRv6Binding SID, and Policy Name (Policy Name), the routing attributes are all routing attributes used by the first candidate path, that is, policy routing attributes at the candidate path level, the controller may add a second routing sub-attribute attributefeccltmap to the second SR Policy routing attributes, the attibuffectbitmap may identify a first SR Policy routing attribute not used by the first candidate path, specifically, the first SR Policy routing attribute includes BFD and Binding SID, and the attibuffectmap may indicate BFD in the first SR Policy routing attribute.

After receiving the first target packet, the network node may determine whether a newly added AttributeEffect BitMap exists in a second SR Policy routing attribute of the second target packet, and if the newly added AttributeEffect BitMap exists, obtain a BFD identified by the AttributeEffect BitMap, determine that a routing attribute used by a first candidate path under the SR Policy is a Binding SID in the first SR Policy routing attribute, that is, determine that the first candidate path does not use BFD. Wherein the AttributeEdectBitMap may indicate a routing attribute of the one or more first SR Policy routing attributes.

It should be noted that, step 2204 and step 2205 may be performed before or after step 2202, which is not limited by the embodiment of the present application.

In this embodiment of the application, the controller may add a second route sub-attribute in the second target packet, and after receiving the second target packet, the network node may determine whether a newly added second route sub-attribute exists in the second target packet, and if the newly added second route sub-attribute exists, determine that the route attribute of the first candidate path does not include the first SR Policy route attribute indicated by the value of the second route sub-attribute, thereby improving the implementability of the scheme.

The following describes a controller in an embodiment of the present application, and the controller includes: the processor is configured to call the program code in the memory so that the controller may execute the information transmission method described in the above embodiment of fig. 5 to 24, where the controller may be the controller in fig. 1, or the controller described in the embodiment of fig. 5 to 24, and details are not repeated here.

Referring to fig. 25, an embodiment of the controller 2500 according to the embodiment of the present disclosure includes:

the obtaining unit 2501 is configured to obtain SR Policy, where the SR Policy includes a first SR Policy routing attribute and at least two candidate paths. The acquiring unit 2501 may perform step 501 in the above-described method embodiments.

A sending unit 2502, configured to send a first target packet to a network node, where the first target packet includes an indication identifier and a first SR Policy routing attribute, and the indication identifier is used to indicate the network node to determine that the first SR Policy routing attribute is a routing attribute for at least two candidate paths. The sending unit 2502 may perform step 502 in the above-described method embodiments.

In this embodiment, the sending unit 2502 obtains the SR Policy, where the SR Policy includes a first SR Policy routing attribute and at least two candidate paths, and the sending unit 2502 sends a first target packet with an indication identifier to the network node, so that the network node can determine, after receiving the target packet, that the first SR Policy routing attribute is a routing attribute for the at least two candidate paths according to the indication identifier, and because the first SR Policy routing attribute is issued alone, the candidate paths of the SR Policy are subsequently issued without carrying the overall routing attributes, thereby avoiding the problems of packet redundancy and information collision.

Referring to fig. 26, the controller in the embodiment of the present application is described in detail below, and another embodiment of the controller 2600 in the embodiment of the present application includes:

an obtaining unit 2601, configured to obtain a segment routing Policy SR Policy, where the SR Policy includes a first SR Policy routing attribute and at least two candidate paths;

a sending unit 2602, configured to send a first target packet to the network node, where the first target packet includes an indication identifier and a first SR Policy routing attribute, and the indication identifier is used to indicate the network node to determine that the first SR Policy routing attribute is a routing attribute for at least two candidate paths.

Optionally, the indication identifier includes a newly added network layer reachability information NLRI type, and the newly added NLRI type is included in the first target message.

Optionally, the sending unit 2602 is further configured to send a first negotiation packet to the network node, where the first negotiation packet is used to indicate that the controller has a capability of supporting the newly added NLRI type;

the controller 2600 further comprises:

a receiving unit 2603, configured to receive a second negotiation packet sent by the network node, where the second negotiation packet is used to indicate that the network node has a capability of supporting the new NLRI type.

Optionally, the indication identifier includes a value of a discriminator field, and the discriminator field is included in the first target message.

Optionally, the indication identifier includes a first routing sub-attribute of the newly added SR Policy, and the first routing sub-attribute is included in the first target packet.

Optionally, the indication identifier includes a value of a tunnel type field, and the tunnel type field is included in the first target packet.

Optionally, the first target packet does not include a candidate path under SR Policy.

Optionally, the sending unit 2602 is further configured to send a second target packet to the network node, where the second target packet includes a first candidate path of the at least two candidate paths.

Optionally, the second target packet further includes a second SR Policy routing attribute, where the second SR Policy routing attribute is a routing attribute for the first candidate path, and the second SR Policy routing attribute is not for a second candidate path of the at least two candidate paths.

Optionally, the controller 2600 further comprises:

a setting unit 2604, configured to set, in the second target packet, enable information, where the enable information is used to indicate whether the first candidate path uses the first SR Policy routing attribute.

Optionally, the enabling information is a second route sub-attribute of the newly added first candidate path.

Optionally, the first target packet is a border gateway protocol packet.

Optionally, the first SR Policy routing attribute includes a Binding SID or bidirectional forwarding detection.

The controller 2600 provided in the embodiment of the present application may be understood by referring to corresponding contents in the foregoing information transmission method, and the controller 2600 may be the controller in fig. 1, or the controller described in the embodiments of fig. 5 to fig. 24, and details are not repeated here.

In the following, a network node in an embodiment of the present application is described, where the network node includes: a processor, a communication interface, and a memory, where the memory is used to store a program code, and the processor is used to call the program code in the memory to enable a network node to execute the information transmission method described in the above embodiment of fig. 5 to 24, where the network node may be the network node in fig. 1, or the network node described in the embodiment of fig. 5 to 24, and details are not repeated here.

Referring to fig. 27, an embodiment of a network node 2700 in the embodiment of the present application includes:

the receiving unit 2701 is configured to receive a first target packet sent by the controller, where the first target packet includes a first SR Policy routing attribute and an indication identifier, and the first SR Policy routing attribute is included in SR Policy. The receiving unit 2701 may perform step 502 in the above-described method embodiment.

A determining unit 2702, configured to determine, according to the indication identifier, that the route attributes of at least two candidate paths under SR Policy are the first SR Policy route attribute. The determination unit 2702 may perform step 503 in the above-described method embodiment.

In this embodiment, the receiving unit 2701 receives a first target packet sent by the controller, where the first target packet includes a first SR Policy routing attribute and an indication identifier set by the controller in the first target packet, and the determining unit 2702 may determine, according to the indication identifier, that the routing attributes of at least two candidate paths under the SR Policy are the first SR Policy routing attribute, that is, determine that the first SR Policy routing attribute is a routing attribute for at least two candidate paths, because the first SR Policy routing attribute is received separately, the candidate paths of the subsequently received SR Policy do not need to carry these overall routing attributes, thereby avoiding the problems of packet redundancy and information collision.

Referring to fig. 28, describing the network node in the embodiment of the present application in detail below, another embodiment of the network node 2800 in the embodiment of the present application includes:

a receiving unit 2801, configured to receive a first target packet sent by the controller, where the first target packet includes a first SR Policy routing attribute and an indication identifier, and the first SR Policy routing attribute is included in SR Policy;

a determining unit 2802, configured to determine, according to the indication identifier, that the route attributes of at least two candidate paths under SR Policy are the first SR Policy route attribute.

Optionally, the indication identifier includes a newly added network layer reachability information NLRI type, where the newly added NLRI type is included in the first target packet, and the determining unit 2802 is specifically configured to determine whether the newly added NLRI type exists in the first target packet; and if the first target message has the newly added NLRI type, determining the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute.

Optionally, the receiving unit 2801 is further configured to receive a first negotiation packet sent by the controller, where the first negotiation packet is used to indicate that the controller has a capability of supporting the new NLRI type;

the network node 2800 further includes:

a sending unit 2803, configured to send a second negotiation packet to the controller, where the second negotiation packet is used to indicate that the network node has a capability of supporting the new NLRI type.

Optionally, the indication identifier includes a value of a specifier field, where the specifier field is included in the first target packet, and the determining unit 2802 is specifically configured to determine whether the value of the specifier field is a first preset value; and if the value of the discriminator field is a first preset value, determining the routing attributes of at least two candidate paths under the SR Policy as first SR Policy routing attributes.

Optionally, the indication identifier includes a first route sub-attribute of the newly added SR Policy, where the first route sub-attribute is included in the first target packet, and the determining unit 2802 is specifically configured to determine whether the first route sub-attribute exists in the first target packet; and if the first routing sub-attribute exists in the first target message, determining the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute.

Optionally, the indication identifier includes a value of a tunnel type field, where the tunnel type field is included in the first target packet, and the determining unit 2802 is specifically configured to determine whether the value of the tunnel type field is a second preset value; and if the value of the tunnel type field is a second preset value, determining the routing attributes of at least two candidate paths under the SR Policy as first SR Policy routing attributes.

Optionally, the receiving unit 2801 is further configured to receive a second target packet sent by the controller, where the second target packet includes a first candidate path in the at least two candidate paths;

the network node 2800 further includes:

an obtaining unit 2804, configured to obtain a first NLRI type of a first target packet and a second NLRI type of a second target packet;

the determining unit 2802 is further configured to determine, when the first NLRI type is the same as the second NLRI type, the routing attribute of the first candidate path to be a first SR Policy routing attribute.

Optionally, the second target packet further includes a second SR Policy routing attribute, where the second SR Policy routing attribute is a routing attribute for the first candidate path, and the second SR Policy routing attribute is not for a second candidate path of the at least two candidate paths, and the determining unit 2802 is specifically configured to determine that the routing attribute of the first candidate path is the first SR Policy routing attribute or the second SR Policy routing attribute.

Optionally, the second target message is provided with enable information, where the enable information is used to indicate whether the first candidate path uses the first SR Policy routing attribute, and the determining unit 2802 is specifically configured to determine the routing attribute of the first candidate path according to the enable information.

Optionally, the enabling information is a second route sub-attribute of the newly added first candidate path, a value of the second route sub-attribute is used to indicate a route attribute in the first SR Policy route attribute, the second route sub-attribute is included in the second target message, and the determining unit 2802 is specifically configured to determine whether the second route sub-attribute exists in the second target message; and if the second target message has the second routing sub-attribute, determining that the routing attribute of the first candidate path does not comprise the first SR Policy routing attribute indicated by the value of the second routing sub-attribute.

Optionally, the first target packet is a border gateway protocol packet.

The network node 2800 provided in this embodiment may refer to corresponding contents in the foregoing information transmission method, and the network node 2800 may be the network node in fig. 1, or the network node described in the embodiments in fig. 5 to fig. 24, and details are not repeated here.

As shown in fig. 29, a schematic diagram of a possible logic structure of a controller 2900 provided for an embodiment of the present application is shown. The controller 2900 includes: a processor 2901, a communication interface 2902, a storage system 2903, and a bus 2904. The processor 2901, communication interface 2902, and storage system 2903 are interconnected by a bus 2904. In an embodiment of the present application, the processor 2901 is configured to control and manage the actions of the controller 2900, for example, the processor 2901 is configured to execute the information transmission method executed by the controller as described in the embodiments of fig. 5 to 24. The communication interface 2902 is used to support the controller 2900 for communication. A storage system 2903 stores program codes and data for controller 2900.

The processor 2901 may be, among other things, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 2901 may also be a combination of computing functions including, for example, one or more microprocessors, a digital signal processor and a microprocessor, or the like. The bus 2904 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 29, but this does not mean only one bus or one type of bus.

As shown in fig. 30, which is a schematic diagram of a possible logic structure of a network node 3000 provided in the embodiment of the present application. The network node 3000 includes: a processor 3001, a communication interface 3002, a memory system 3003, and a bus 3004. The processor 3001, the communication interface 3002, and the memory system 3003 are connected to each other via a bus 3004. In the embodiment of the present application, the processor 3001 is configured to control and manage the actions of the network node 3000, for example, the processor 3001 is configured to execute an information transmission method performed by the network node described in the partial embodiments of fig. 5 to 24. Communication interface 3002 is used to support communications for network node 3000. A storage system 3003 for storing program codes and data for the network node 3000.

Processor 3001 may be, among other things, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic, a hardware component, or any combination thereof. Which may implement or execute the various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein. The processor 3001 may also be a combination of implementing computing functionality, e.g., comprising one or more microprocessors, a combination of digital signal processors and microprocessors, and so forth. The bus 3004 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 30, but this is not intended to represent only one bus or type of bus.

For example, referring to fig. 3 together, the network node 3000 provided in the embodiment of the present application may be the network node shown in fig. 3, where the processor 3001 corresponds to the processor 301, the communication interface 3002 corresponds to the transceiver 302, the storage system 3003 corresponds to the memory 303, and the bus 3004 corresponds to the bus 304.

In another embodiment of the present application, a computer-readable storage medium is further provided, in which computer-executable instructions are stored, and when at least one processor of the device executes the computer-executable instructions, the device executes the information transmission method described in the above-mentioned embodiment in fig. 5 to 24.

In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the computer executable instructions may be read by at least one processor of the device from a computer readable storage medium, and execution of the computer executable instructions by the at least one processor causes the device to perform the information transfer method described above in the embodiments of fig. 5-24.

In another embodiment of the present application, a chip system is further provided, where the chip system includes at least one processor and an interface, the interface is configured to receive data and/or signals, and the at least one processor is configured to support implementation of the information transmission method described in the foregoing embodiment of fig. 5 to fig. 24. In one possible design, the system-on-chip may further include a memory, the memory storing program instructions and data necessary for the computer device. The chip system may be constituted by a chip, or may include a chip and other discrete devices.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.

Claims

1. An information transmission method, comprising:

the method comprises the steps that a controller obtains a segment routing strategy SR Policy, wherein the SR Policy comprises a first SR Policy routing attribute and at least two candidate paths;

the controller sends a first target packet to a network node, where the first target packet includes an indication identifier and the first SR Policy routing attribute, and the indication identifier is used to indicate the network node to determine that the first SR Policy routing attribute is a routing attribute for the at least two candidate paths.

2. The method of claim 1, wherein the indication comprises a new added Network Layer Reachability Information (NLRI) type, and wherein the new added NLRI type is included in the first target message.

3. The method of claim 2, wherein before the controller sends the first target packet to the network node, the method further comprises:

the controller sends a first negotiation message to the network node, wherein the first negotiation message is used for indicating that the controller has the capacity of supporting the newly added NLRI type;

and the controller receives a second negotiation message sent by the network node, wherein the second negotiation message is used for indicating that the network node has the capability of supporting the newly added NLRI type.

4. The method of claim 1, wherein the indicator comprises a value of a distinguisher field, and wherein the distinguisher field is included in the first target message.

5. The method as claimed in claim 1, wherein the indication flag includes a first routing sub-attribute of the added SR Policy, and the first routing sub-attribute is included in the first target packet.

6. The method of claim 1, wherein the indication comprises a value of a tunnel type field, and wherein the tunnel type field is included in the first target message.

7. The method according to any of claims 1-6, wherein the first target packet does not include a candidate path under the SR Policy.

8. The method according to any one of claims 1 to 6, further comprising:

the controller sends a second target packet to the network node, where the second target packet includes a first candidate path of the at least two candidate paths.

9. The method of claim 8, wherein the second target packet further comprises a second SR Policy routing attribute, wherein the second SR Policy routing attribute is a routing attribute for the first candidate path, and wherein the second SR Policy routing attribute is not for a second candidate path of the at least two candidate paths.

10. The method of claim 8, wherein before the controller sends the second target packet to the network node, the method further comprises:

the controller sets enabling information in the second target message, wherein the enabling information is used for indicating whether the first candidate path uses the first SR Policy routing attribute.

11. The method of claim 10, wherein the enabling information is a second route sub-attribute of the newly added first candidate path.

12. The method according to any of claims 1 to 6 or 9 to 11, wherein the first target packet is a border gateway protocol packet.

13. The method of any of claims 1-6 or 9-11, wherein the first SR Policy routing attribute comprises a Binding SID or a bidirectional forwarding detection.

14. An information transmission method, comprising:

a network node receives a first target message sent by a controller, wherein the first target message comprises a first SR Policy routing attribute and an indication identifier, and the first SR Policy routing attribute is contained in SR Policy;

and the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute according to the indication identifier.

15. The method of claim 14, wherein the indication identifier comprises a new NLRI type of network layer reachability information, the new NLRI type being included in the first target packet, and wherein the determining, by the network node according to the indication identifier, the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute comprises:

the network node judges whether the newly added NLRI type exists in the first target message;

if the newly added NLRI type exists in the first target message, the network node determines the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute.

16. The method of claim 15, wherein before the network node receives the first target packet sent by the controller, the method further comprises:

the network node receives a first negotiation message sent by the controller, wherein the first negotiation message is used for indicating that the controller has the capability of supporting the newly added NLRI type;

and the network node sends a second negotiation message to the controller, wherein the second negotiation message is used for indicating that the network node has the capability of supporting the newly added NLRI type.

17. The method of claim 14, wherein the indicator comprises a value of a specifier field included in the first target packet, and wherein the determining, by the network node, the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute comprises:

the network node judges whether the value of the specifier field is a first preset value or not;

and if the value of the discriminator field is a first preset value, the network node determines the routing attributes of at least two candidate paths under the SR Policy to be the first SR Policy routing attribute.

18. The method of claim 14, wherein the indication comprises a first routing sub-attribute of the SR Policy, the first routing sub-attribute is included in the first target packet, and the determining, by the network node according to the indication, the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute comprises:

the network node judges whether the first routing sub-attribute exists in the first target message;

if the first routing sub-attribute exists in the first target packet, the network node determines that the routing attributes of at least two candidate paths under the SR Policy are the first SR Policy routing attributes.

19. The method of claim 14, wherein the indication comprises a value of a tunnel type field, wherein the tunnel type field is included in the first target packet, and wherein the determining, by the network node according to the indication, the routing attributes of at least two candidate paths under the SR Policy as the first SR Policy routing attribute comprises:

the network node judges whether the value of the tunnel type field is a second preset value or not;

and if the value of the tunnel type field is a second preset value, the network node determines the routing attributes of at least two candidate paths under the SR Policy to be the first SR Policy routing attribute.

20. The method of any of claims 14 to 19, wherein the first target packet does not include a candidate path under the SR Policy.

21. The method according to any one of claims 14 to 19, further comprising:

the network node receives a second target message sent by the controller, wherein the second target message comprises a first candidate path in the at least two candidate paths;

the network node acquires a first NLRI type of the first target message and a second NLRI type of the second target message;

when the first NLRI type is the same as the second NLRI type, the network node determines that the route attribute of the first candidate path is the first SR Policy route attribute.

22. The method of claim 21, wherein the second target packet further comprises a second SR Policy routing attribute, wherein the second SR Policy routing attribute is a routing attribute for the first candidate path, wherein the second SR Policy routing attribute is not for a second candidate path of the at least two candidate paths, and wherein the network node determining the routing attribute of the candidate path as the first SR Policy routing attribute comprises:

the network node determines a routing attribute of the first candidate path to be the first SR Policy routing attribute or the second SR Policy routing attribute.

23. The method of claim 21, wherein the second target message is provided with enabling information, the enabling information is used for indicating whether the first candidate path uses the first SR Policy routing attribute, and the determining, by the network node, the routing attribute of the candidate path as the first SR Policy routing attribute comprises:

and the network node determines the routing attribute of the first candidate path according to the enabling information.

24. The method of claim 23, wherein the enabling information is a second routing sub-attribute of the newly added first candidate path, a value of the second routing sub-attribute is used for indicating a routing attribute in the first SR Policy routing attribute, the second routing sub-attribute is included in the second target message, and the determining, by the network node, the routing attribute of the first candidate path according to the enabling information comprises:

the network node judges whether the second routing sub-attribute exists in the second target message;

if the second route sub-attribute exists in the second target message, the network node determines that the route attribute of the first candidate path does not include the first SR Policy route attribute indicated by the value of the second route sub-attribute.

25. The method according to any one of claims 14 to 19 or 22 to 24, wherein the first target packet is a border gateway protocol packet.

26. The method of any of claims 14-19 or 22-24, wherein the first SR Policy routing attribute comprises a Binding SID or a bidirectional forwarding detection.

27. A controller, comprising: a processor, a communication interface, and a memory for storing program code, the processor for invoking the program code in the memory to cause the controller to perform the method of any of claims 1-13.

28. A network node, comprising: a processor, a communication interface, and a memory for storing program code, the processor for invoking the program code in the memory to cause the network node to perform the method of any of claims 14-26.

29. A computer-readable storage medium comprising instructions that when executed on a computer cause the computer to perform the method of any of claims 1 to 13 or 14 to 26.