CN111327528A - Label attribute identification method, device, equipment and storage medium - Google Patents

Label attribute identification method, device, equipment and storage medium Download PDF

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Publication number
CN111327528A
CN111327528A CN201811542617.0A CN201811542617A CN111327528A CN 111327528 A CN111327528 A CN 111327528A CN 201811542617 A CN201811542617 A CN 201811542617A CN 111327528 A CN111327528 A CN 111327528A
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message
label
attribute
mpls
tag
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CN201811542617.0A
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孔玲丽
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ZTE Corp
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ZTE Corp
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Priority to CN201811542617.0A priority Critical patent/CN111327528A/en
Priority to PCT/CN2019/126078 priority patent/WO2020125651A1/en
Publication of CN111327528A publication Critical patent/CN111327528A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H04L45/507—Label distribution

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

Abstract

The invention discloses a label attribute identification method, a label attribute identification device, label attribute identification equipment and a storage medium. The label attribute identification method identifies the label attribute before the message is forwarded, and the method comprises the following steps: identifying the MPLS message based on the message analysis result of the received data packet; extracting a label value of a label in the MPLS message; and acquiring the label attribute based on the label value. The label attribute is identified before the message is forwarded, the received message is analyzed so as to identify the MPLS message, and then the label attribute is obtained according to the label value of the label in the extracted MPLS message. Before the message is forwarded, namely when the message is received, the label attribute of the message is obtained, so that the label attribute is distinguished, the problem that the position of a forwarding label is determined by searching the label attribute in the forwarding process and the resource waste is caused by message analysis in the forwarding process is avoided, the data processing capacity is improved, and the bandwidth resource is saved.

Description

Label attribute identification method, device, equipment and storage medium
Technical Field
The present invention relates to the field of data communications, and in particular, to a method, an apparatus, a device, and a storage medium for identifying tag attributes.
Background
For a VPN network, it needs to determine whether L3VPN or L2VPN is configured, and it needs to determine the location of the device in the network to determine its forwarding behavior, which are determined by the label attribute.
In the method for implementing the tag attribute in the prior art, the message is not preprocessed before being forwarded, and the tag attribute of the message is not identified, so that the tag attribute information needs to be obtained by table lookup during forwarding, and instruction space needs to be wasted while table lookup resources are wasted to continue analyzing the message. Or the label range is divided to distinguish the label attributes, which causes great waste to label resources.
Disclosure of Invention
Embodiments of the present invention provide a method, an apparatus, a device, and a storage medium for identifying a tag attribute, so as to solve the problems of restriction of tag allocation and resource waste caused by an undetermined tag attribute in the prior art.
In a first aspect, an embodiment of the present invention provides a method for identifying a tag attribute, where the tag attribute is identified before forwarding a packet, and the method includes:
identifying the MPLS message based on the message analysis result of the received data packet;
extracting a label value of a label in the MPLS message;
and acquiring the label attribute based on the label value.
As a specific implementation manner of the embodiment of the present invention, the identifying an MPLS packet based on a packet parsing result of a received packet includes:
receiving a data packet from a network side;
comparing and analyzing the messages of the data packet;
and identifying the MPLS message according to the comparison and analysis result.
As a specific implementation manner of the embodiment of the present invention, after the step of receiving the data packet from the network side, the method further includes the following steps;
the received data packet is stored.
As a specific implementation manner of the embodiment of the present invention, the obtaining of the tag attribute based on the tag value includes:
and searching the attribute of the label in a pre-stored label attribute table based on the label value, thereby obtaining the label attribute.
As a specific implementation manner of the embodiment of the present invention, after the step of obtaining the tag attribute based on the tag value, the method further includes:
determining a header type of the label based on the label attribute;
and forwarding the labeled message according to a message header, wherein the message header is obtained by packaging the type of the message header.
As a specific implementation manner of the embodiment of the present invention, before the step of forwarding the labeled packet according to the packet header, the method includes:
and encapsulating the message header according to the message header type.
As a specific implementation manner of the embodiment of the present invention, the encapsulating the packet header according to the packet header type includes:
acquiring a message header type and a corresponding position of the message header type in a message header;
acquiring the identifier of the special message;
and packaging the message header type, the corresponding position of the message header type in the message header or the identifier of the special message into the message header.
In a second aspect, a tag attribute identification apparatus identifies a tag attribute before forwarding a packet, the apparatus includes:
a message analysis module: the method comprises the steps of identifying the MPLS message based on the message analysis result of the received data packet;
an extraction module: the label value is used for extracting a label in the MPLS message;
an acquisition module: for obtaining a tag attribute based on the tag value.
In a third aspect, a network device, the network device comprising: memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method of any of the first aspects.
In a fourth aspect, a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method of any one of the first aspects.
The embodiment of the invention identifies the label attribute before the message is forwarded, analyzes the received message to identify the MPLS message, and then acquires the label attribute according to the label value of the label in the extracted MPLS message. Before the message is forwarded, namely when the message is received, the label attribute of the message is obtained, so that the label attribute is distinguished, the problem that the position of a forwarding label is determined by searching the label attribute in the forwarding process and the resource waste is caused by message analysis in the forwarding process is avoided, the data processing capacity is improved, and the bandwidth resource is saved. Therefore, the problems of label distribution limitation and resource waste caused by undetermined label attributes are solved, resources are saved, and the method is simple and easy to implement.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a flowchart of a tag attribute identification method according to a first embodiment of the present invention;
fig. 2 is a flowchart of a tag attribute identification method according to a second embodiment of the present invention;
fig. 3 is a schematic block diagram of a tag attribute identification apparatus according to a third embodiment of the present invention;
fig. 4 is a schematic block diagram of a message parsing module according to a third embodiment of the present invention;
fig. 5 is a schematic block diagram of a package module according to a third embodiment of the present invention;
fig. 6 is a flowchart illustrating a label attribute identifying apparatus according to a third embodiment of the present invention forwarding a label packet in a VPN network;
fig. 7 and 8 are schematic diagrams of VPN network structures.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The networks and services of the Internet have been explosively increased, and higher requirements are put forward for backbone networks, and MPLS (Multi Protocol Label switching ) is a technology generated under the background, and absorbs the VPI/VCI switching thought of ATM, seamlessly integrates the flexibility of IP routing technology and the simplicity of two-layer switching, and adds the connection-oriented attribute of MPLS in the connectionless-oriented IP network.
Meanwhile, the advantages of MPLS in traffic engineering, VPN and the like are highlighted. The MPLS VPN is an IP VPN based on MPLS technology, and is an IP virtual private network (IP VPN) which is realized by applying the MPLS technology on network routing and switching equipment, simplifying the routing mode of a core router and combining label switching of the traditional routing technology. MPLS has the advantage of combining two-layer switching and three-layer routing technologies with superior performance in addressing the significant problems of IP networks, such as VPN, service classification and traffic engineering. Therefore, MPLS VPN is also being seen by operators to solve the problem of interconnection between enterprises and provide various new services, and becomes an important means for providing value-added services for IP network operators. MPLS VPNs may be further divided into two-layer MPLS VPNs (i.e., MPLS L2 VPNs) and three-layer MPLS VPNs (i.e., MPLS L3 VPNs). The VPN network structure is shown in fig. 7 and 8.
The MPLS VPN network mainly comprises 3 parts such as CE, PE and P:
ce (customer Edge router) customer network Edge router devices, directly connected to the service provider network, that "sense" the absence of VPNs;
PE (provider Edge router) service provider Edge router equipment which is directly connected with a CE of a user and is responsible for VPN service access and VPN-IPv4 routing processing is a main implementer of MPLS three-layer VPN;
the p (provider router) service provider core router device is responsible for fast forwarding data and is not directly connected with the CE.
In the entire MPLS VPN, P, PE devices need to support the basic functionality of MPLS, and CE devices do not need to support MPLS.
The MPLS VPN network adopts label exchange, one label corresponds to one user data flow, so that the data isolation among users is very easy, the QoS/CoS problem disturbing the traditional IP network can be easily solved by utilizing a differentiated service system, the MPLS self provides the capacity of flow engineering, the network resources can be optimized and configured to the maximum extent, the network fault can be automatically and rapidly repaired, and the high availability and the high reliability are provided.
In order to deploy traffic engineering in a large backbone network, a simple solution with good scalability must be adopted. MPLS TE is proposed for this requirement. TE may also support the currently mainstream MPLS L3/L2VPN application. The TE tunnel can be used as a public network tunnel of VPN application, and bandwidth guarantee is provided for VPN users.
For MPLS forwarding, after an LSP is established, traffic is forwarded through the LSP at an ingress node of the LSP according to an allocated label. The device has different label attributes at different locations in the network to determine which level of label to forward.
The MPLS VPN application comprises L3/L2VPN, PE equipment has different message encapsulation formats and different forwarding behaviors, so that the attributes of labels need to be distinguished; meanwhile, the data stream may be carried in different tunnels, so that it is also necessary to determine the attribute of the label to determine whether the tunnel is terminated, so as to determine which level of label to forward.
The first embodiment is as follows:
an embodiment of the present invention provides a method for identifying a tag attribute, which identifies the tag attribute before forwarding a packet, and as shown in fig. 1, the method includes:
step S101: identifying the MPLS message based on the message analysis result of the received data packet;
optionally, the step S101 of identifying the MPLS packet based on the packet parsing result of the received data packet includes: receiving a data packet from a network side; comparing and analyzing the messages of the data packet; and identifying the MPLS message according to the comparison and analysis result.
Optionally, after the step of receiving the data packet from the network side, the method further includes the step of receiving the data packet from the network side; the received data packet is stored.
In a specific application scenario, such as a scenario of forwarding a label packet in a VPN network, a data packet is received from a network side, then the received data packet is stored in tcam (ternary content addressable memory), the stored packet is compared and analyzed, and when the packet is found to be an MPLS packet, step S102 is performed.
Step S102: extracting a label value of a label in the MPLS message;
for example, in a scenario of forwarding a label packet in a VPN network, when the packet is found to be an MPLS packet, a label value of the label in the packet is extracted.
Step S103: and acquiring the label attribute based on the label value.
Optionally, obtaining the tag attribute based on the tag value includes: and searching the attribute of the label in a pre-stored label attribute table based on the label value, thereby obtaining the label attribute.
For example, in a scenario of forwarding a label message in a VPN network, a label attribute table is stored in the VPN network in advance, and an attribute of the label is searched in the label attribute table by using a label value of the label to obtain a label attribute.
Example two:
an embodiment of the present invention provides a method for identifying a tag attribute, which identifies the tag attribute before forwarding a packet, and as shown in fig. 2, the method includes:
step S201: identifying the MPLS message based on the message analysis result of the received data packet;
optionally, the step S101 of identifying the MPLS packet based on the packet parsing result of the received data packet includes: receiving a data packet from a network side; comparing and analyzing the messages of the data packet; and identifying the MPLS message according to the comparison and analysis result.
Optionally, after the step of receiving the data packet from the network side, the method further includes the step of receiving the data packet from the network side; the received data packet is stored.
In a specific application scenario, such as a scenario of forwarding a label packet in a VPN network, a data packet is received from a network side, then the received data packet is stored in tcam (ternary content addressable memory), the stored packet is compared and analyzed, and when the packet is found to be an MPLS packet, step S102 is performed.
Step S202: extracting a label value of a label in the MPLS message;
for example, in a scenario of forwarding a label packet in a VPN network, when the packet is found to be an MPLS packet, a label value of the label in the packet is extracted.
Step S203: and acquiring the label attribute based on the label value.
Optionally, obtaining the tag attribute based on the tag value includes: and searching the attribute of the label in a pre-stored label attribute table based on the label value, thereby obtaining the label attribute.
For example, in a scenario of forwarding a label message in a VPN network, a label attribute table is stored in the VPN network in advance, and an attribute of the label is searched in the label attribute table by using a label value of the label to obtain a label attribute.
Step S204: determining a header type of the label based on the label attribute;
and judging whether the label is the attributes of tunnel termination, PW or LSR and the like according to the returned label attribute so as to determine the message header type of the label.
Step S205: and forwarding the labeled message according to a message header, wherein the message header is obtained by packaging the type of the message header.
Optionally, before the step of forwarding the labeled packet according to the packet header, the method includes: and encapsulating the message header according to the message header type.
Optionally, the encapsulating the packet header according to the packet header type includes: acquiring a message header type and a corresponding position of the message header type in a message header;
acquiring the identifier of the special message; and packaging the message header type, the corresponding position of the message header type in the message header or the identifier of the special message into the message header.
In a specific application scenario, the label is judged to be the attributes of tunnel termination, PW or LSR and the like through the label attribute, after the type of the message header after the label is determined, the type of the message header, the corresponding position in the message header and the identifier of the special message are sealed in the message header, and therefore corresponding forwarding processing is carried out according to the message header.
Example three:
an embodiment of the present invention provides a tag attribute identification apparatus, which identifies a tag attribute before forwarding a packet, and as shown in fig. 3, the apparatus includes:
the message analysis module 301: the method comprises the steps of identifying the MPLS message based on the message analysis result of the received data packet;
the extraction module 302: the label value is used for extracting a label in the MPLS message;
the obtaining module 303: for obtaining a tag attribute based on the tag value.
In an optional embodiment of the present invention, as shown in fig. 4, the message parsing module 301 includes:
the message receiving module 401: the data packet receiving device is used for receiving a data packet from a network side;
the comparison and analysis module 403: the data packet processing module is used for comparing and analyzing the messages of the data packet;
the identification module 404: and the MPLS message is identified according to the comparison and analysis result.
Optionally, the apparatus further comprises;
the storage module 402: for storing the received data packets.
In an optional embodiment of the present invention, the obtaining module 303 includes:
a tag attribute identification module: the attribute searching module is used for searching the attribute of the label in a pre-stored label attribute table based on the label value so as to obtain the label attribute.
In an optional embodiment of the invention, the apparatus further comprises:
the determination module 304: a header type for determining the label based on the label attribute;
the forwarding module 306: the method is used for forwarding the labeled message according to a message header, wherein the message header is obtained by packaging the type of the message header.
In an optional embodiment of the invention, the apparatus further comprises:
the package module 305: and the message header is packaged according to the message header type.
In an alternative embodiment of the present invention, as shown in fig. 5, the encapsulation module 305 includes:
header acquisition module 501: the method comprises the steps of obtaining a message header type and a corresponding position of the message header type in a message header;
the identity acquisition module 502: the identifier is used for acquiring the identifier of the special message;
a header encapsulation module 503: and the message header type is used for packaging the message header type, the corresponding position of the message header type in the message header or the identifier of the special message into the message header.
A step of forwarding a label packet in a VPN network by a label attribute identification apparatus, specifically as shown in fig. 6, step S601: the message receiving module receives the packet from the network side and sends the packet to the message analyzing module;
step S602: the message analysis module sends the message to tcam of the module, compares and analyzes the message, extracts label value in the message and sends the label value to the label attribute identification module when finding that the message is MPLS message;
step S603: and the label attribute identification module stores a label attribute table, searches the attribute of the label by using the label value of the label and returns the attribute to the message analysis module.
Step S604: the message analysis module judges the label is the attributes of tunnel termination, PW or LSR and the like through the returned label attribute so as to determine the type of the message header after the label. And sealing the header type and the corresponding position of the message and the identifier of the special message in the message header and bringing the message header to a forwarding module for corresponding forwarding processing.
The label attribute identification device distinguishes the attribute of the label when receiving the message, so that the packaging format of the message is known, the whole message is analyzed, and the analyzed result is brought to the forwarding module for processing.
The tag attribute identification module identifies the tag attributes in advance, solves the problems of tag distribution limitation and resource waste caused by undetermined tag attributes, saves resources and is simple and easy to implement.
By distinguishing the label attributes in the message analysis module, the situation that the positions of the forwarding labels are determined by searching the label attributes in the forwarding module and the resource waste is caused by message analysis in the forwarding module is avoided, the data processing capacity of the forwarding matrix submodule is improved, and the bandwidth resource of the forwarding matrix submodule is saved.
Example four:
an embodiment of the present invention provides a network device, which can be understood as an entity apparatus, and includes a processor and a memory storing instructions executable by the processor, and when the instructions are executed by the processor, the method steps described in the first embodiment or the second embodiment are executed.
The specific embodiment process of the above method steps can be referred to in the first embodiment and the second embodiment, and the detailed description of the embodiment is not repeated here.
The Processor may be a general-purpose Processor, such as a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention. Wherein the memory is used for storing executable instructions of the processor; a memory for storing the program code and transmitting the program code to the processor. The Memory may include Volatile Memory (Volatile Memory), such as Random Access Memory (RAM); non-volatile Memory (Non-volatile Memory) such as Read-Only Memory (ROM), Flash Memory (Flash Memory), Hard Disk (HDD), or Solid-State Drive (SSD) may also be included; combinations of the above categories of memory may also be included.
Example five:
an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method steps of the first or second example.
The specific embodiment process of the above method steps can be referred to in the first embodiment and the second embodiment, and the detailed description of the embodiment is not repeated here.
Among the computer-readable storage media are, but not limited to: ROM, RAM, magnetic or optical disks, and the like.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A method for identifying label attribute is characterized in that the label attribute is identified before the message is forwarded, and the method comprises the following steps:
identifying the MPLS message based on the message analysis result of the received data packet;
extracting a label value of a label in the MPLS message;
and acquiring the label attribute based on the label value.
2. The label attribute identification method of claim 1, wherein identifying the MPLS packet based on the packet parsing result of the received packet comprises:
receiving a data packet from a network side;
comparing and analyzing the messages of the data packet;
and identifying the MPLS message according to the comparison and analysis result.
3. The tag attribute identification method of claim 2, wherein the step of receiving the data packet from the network side is followed by further comprising;
the received data packet is stored.
4. The tag attribute identification method of claim 1, wherein the obtaining the tag attribute based on the tag value comprises:
and searching the attribute of the label in a pre-stored label attribute table based on the label value, thereby obtaining the label attribute.
5. The tag attribute identification method of any of claims 1 to 4, wherein after the step of obtaining the tag attribute based on the tag value, further comprising:
determining a header type of the label based on the label attribute;
and forwarding the labeled message according to a message header, wherein the message header is obtained by packaging the type of the message header.
6. The method for label attribute identification according to claim 5, wherein the step of forwarding the labeled message according to the message header comprises:
and encapsulating the message header according to the message header type.
7. The tag attribute identification method of claim 6, wherein said encapsulating the header according to the header type comprises:
acquiring a message header type and a corresponding position of the message header type in a message header;
acquiring the identifier of the special message;
and packaging the message header type, the corresponding position of the message header type in the message header or the identifier of the special message into the message header.
8. A tag attribute identification device, which is characterized in that the tag attribute is identified before the message is forwarded, the device comprises:
a message analysis module: the method comprises the steps of identifying the MPLS message based on the message analysis result of the received data packet;
an extraction module: the label value is used for extracting a label in the MPLS message;
an acquisition module: for obtaining a tag attribute based on the tag value.
9. A network device, characterized in that the network device comprises: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
CN201811542617.0A 2018-12-17 2018-12-17 Label attribute identification method, device, equipment and storage medium Withdrawn CN111327528A (en)

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