CN108234355B - Network resource reservation method, PCE (personal computer equipment) and SDN (software defined network) system - Google Patents
Network resource reservation method, PCE (personal computer equipment) and SDN (software defined network) system Download PDFInfo
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- CN108234355B CN108234355B CN201611156262.2A CN201611156262A CN108234355B CN 108234355 B CN108234355 B CN 108234355B CN 201611156262 A CN201611156262 A CN 201611156262A CN 108234355 B CN108234355 B CN 108234355B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/72—Admission control; Resource allocation using reservation actions during connection setup
- H04L47/724—Admission control; Resource allocation using reservation actions during connection setup at intermediate nodes, e.g. resource reservation protocol [RSVP]
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Abstract
The invention discloses a network resource reservation method, a PCE (personal computer equipment) and an SDN (software defined network) system, and relates to the field of communication, wherein the method comprises the following steps: the PCE calculates a forwarding path for the service data based on a flow scheduling strategy; the PCE sends resource reservation information to the routing node passed by the forwarding path, and the resource reservation information comprises: label information of the service data and bandwidth reservation information corresponding to the label information; and the routing node sets reserved resources for the forwarding of the service data according to the resource reservation information. According to the method, the PCE and the SDN network, on the basis of global optimization path calculation, the link bandwidth of a passing node is reserved in advance, PCE frequent recalculation caused by subsequent flow change is reduced, and the performance of an SDN controller is improved; the method is expanded based on the existing PCEP protocol and is easy to implement; the method and the system can realize the centralized traffic scheduling in a complex network environment and improve the traffic scheduling and optimizing capability of an operator in the network.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a network resource reservation method, a PCE, and an SDN network system.
Background
Under an SDN (Software Defined Network) Network architecture, the request and calculation for optimizing a Path are generally implemented by a PCEP (Path computing Element Protocol) Protocol. Segment Routing is a source Routing mechanism that will provide the network with the ability to interact quickly with upper layer applications. Segment Routing is also based on label switching, but is different from the MPLS network that needs to realize label distribution and TE functions by means of external protocols such as LDP, RSVP, etc., and Segment Routing can realize TE, FRR, MPLS VPN functions by simply extending the existing IGP protocol. Segment Routing transmits a Label for network elements such as nodes and links by extending an IGP protocol, and the realization process generally includes acquiring Link topology and flow data in real time through an SDN controller and carrying out centralized calculation on a path capable of ensuring the end-to-end performance of a service; and directly pressing a plurality of layers of Label at a data sending source to control the trend of the data flow and realize real-time service-oriented guarantee. The label, path and processing mechanism in forwarding the service data through the Segment Routing data plane are shown in fig. 1. Because the existing Segment Routing label forwarding is realized without depending on the traditional distributed RSVP protocol, the end-to-end service path bandwidth reservation is difficult to realize, when the network flow changes frequently, a centralized route calculation function is continuously triggered, and a larger pressure is formed on an SDN controller.
Disclosure of Invention
In view of this, a technical problem to be solved by the present invention is to provide a network resource reservation method, a PCE and an SDN network system.
According to an embodiment of the present invention, there is provided a network resource reservation method, including: a Path Computation Element (PCE) computes a forwarding path for service data based on a flow scheduling strategy; the PCE issues resource reservation information to the routing node passed by the forwarding path, wherein the resource reservation information comprises: label information of service data and bandwidth reservation information corresponding to the label information; and the routing node sets reserved resources for the forwarding of the service data according to the resource reservation information.
Optionally, the sending, by the PCE, resource reservation information to the routing node through which the forwarding path passes includes: the PCE determines a routing node through which the forwarding path passes according to the forwarding path, and determines a bandwidth which needs to be reserved for forwarding the service data by the routing node; and the PCE transmits the resource reservation information to the routing node based on the extended PCEP protocol message.
Optionally, the extended PCEP protocol message carries a resource reservation object, where the resource reservation object is used to transmit the resource reservation information.
Optionally, the data format of the resource reservation object includes: a label field, a bandwidth reservation field; the label field is used for transmitting label information of the service data, and the bandwidth reservation field is used for transmitting bandwidth which needs to be reserved for forwarding the service data by the routing node.
Optionally, the tag information is an outermost tag used by the service data; and the routing node judges whether bandwidth resources are reserved for the service data or not according to the outmost label of the received service data, and if so, the reserved bandwidth resources are used for forwarding the service data.
Optionally, the data format of the resource reservation object further includes: a link address field, a bandwidth reservation direction field; wherein the link address field is used for transmitting a link address of the routing node, the bandwidth reservation direction field is used for transmitting a reservation direction of the routing node for reserving bandwidth, and the reservation direction comprises: and receiving and sending service data.
Optionally, the link address of the routing node is encapsulated in a type length value, TLV; wherein the link address comprises: IPV4, IPV6 address.
Optionally, the extended PCEP protocol message includes: an extended PCReq message, an extended PCNtf message.
According to another aspect of the present invention, there is provided a path computation element, PCE, comprising: the path calculation module is used for calculating a forwarding path for the service data based on the flow scheduling strategy; a resource reservation sending module, configured to issue resource reservation information to the routing node through which the forwarding path passes, where the resource reservation information includes: label information of service data and bandwidth reservation information corresponding to the label information; and the routing node sets reserved resources for the forwarding of the service data according to the resource reservation information.
Optionally, the resource reservation determining module is configured to determine, according to the forwarding path, a routing node through which the forwarding path passes, and determine a bandwidth that needs to be reserved for forwarding the service data by the routing node; and the resource reservation sending module is used for sending the resource reservation information to the routing node based on the extended PCEP protocol message.
Optionally, the extended PCEP protocol message carries a resource reservation object, where the resource reservation object is used to transmit the resource reservation information.
Optionally, the resource reservation transmitting module is configured to generate the resource reservation object; wherein, the data format of the resource reservation object comprises: a label field, a bandwidth reservation field; the label field is used for transmitting label information of the service data, and the bandwidth reservation field is used for transmitting bandwidth which is required to be reserved by the routing node for forwarding the service data.
Optionally, the tag information is an outermost tag used by the service data; and the routing node judges whether bandwidth resources are reserved for the service data or not according to the outmost label of the received service data, and if so, the reserved bandwidth resources are used for forwarding the service data.
Optionally, the data format of the resource reservation object further includes: a link address field, a bandwidth reservation direction field; wherein the link address field is used for transmitting a link address of the routing node, the bandwidth reservation direction field is used for transmitting a reservation direction of the routing node for reserving bandwidth, and the reservation direction comprises: and receiving and sending service data.
Optionally, the link address of the routing node is encapsulated in a type length value, TLV; wherein the link address comprises: IPV4, IPV6 address.
Optionally, the extended PCEP protocol message includes: an extended PCReq message, an extended PCNtf message.
According to still another aspect of the present invention, there is provided an SDN network system including: a routing node, a PCE according to any of claims 9 to 16.
According to the network resource reservation method, the PCE and the SDN network system, the resource reservation information is issued to the routing nodes passed by the forwarding paths, the link bandwidth of the passed nodes is reserved in advance on the basis of global optimization path calculation, the PCE frequent recalculation caused by subsequent flow change is reduced, and the performance of the SDN controller is improved; the method can realize centralized automatic adjustment of the flow, is expanded based on the existing PCEP protocol, is easy to implement, and can improve the flow scheduling and optimizing capability of an operator in the network.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of tag forwarding based on Segment Routing protocol in the prior art;
fig. 2 is a flowchart illustrating an embodiment of a network resource reservation method according to the present invention;
fig. 3 is a schematic data format diagram of a resource reservation object in an embodiment of a network resource reservation method according to the present invention;
FIG. 4 is a schematic diagram of a scheduling process of a centralized traffic optimization scheduling system implemented based on an extended PCEP protocol;
fig. 5 is a block diagram of a PCE in accordance with the present invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The technical solution of the present invention is described in various aspects below with reference to various figures and embodiments.
Fig. 2 is a flowchart illustrating an embodiment of a network resource reservation method according to the present invention, as shown in fig. 2:
in step 201, PCE (Path Computation element) computes a forwarding Path for service data based on a traffic scheduling policy.
And the PCE determines a routing node through which the forwarding path passes according to the forwarding path and determines resources which need to be reserved for forwarding the service data by the routing node. The PCE may issue resource reservation information to the routing node based on an extended PCEP protocol message, which may be an extended PCReq message, an extended PCNtf message, or the like.
The PCEP protocol may employ a variety of extensions for sending resource reservation information to the routing nodes. The routing node may be a router or the like, and the PCC may be set on the routing node. The PCEP protocol is a communication protocol between a PCC (Path Computation Client) and a PCE. The PCEP protocol defines a series of Object classes, which are used to convey some constraints in the path computation process, such as the starting point of the optimized path, the bandwidth required by the optimized path, and the intermediate nodes that the optimized path needs to pass through. However, there is no objection for transferring resource reservation information in ObjectClass specified by the current protocol.
And carrying a resource reservation object in the extended PCEP protocol message, wherein the resource reservation object is used for transmitting resource reservation information. PCE sends the resource reservation Object to the route node, expands the existing PCEP protocol, newly defines a transfer resource reservation and the corresponding Object, to realize the flow centralized calculation based on the service flow and the automatic reservation of the resource.
The network resource reservation method in the above embodiment extends the existing PCEP protocol, and defines an Object for issuing a reserved bandwidth to a routing node in a data forwarding path to reserve a bandwidth in advance on a calculated path, so as to ensure that subsequent non-guaranteed traffic does not occupy the reserved bandwidth, and when traffic changes, a PCE is not required to perform path centralized calculation and forwarding policy re-issue again, thereby reducing the pressure of an SDN controller.
The data format of the resource reservation object includes: a label field, a bandwidth reservation field. The tag field is used for transmitting tag information of the service data, and the tag information may be an outermost tag used by the service data. The bandwidth reservation field is used for transmitting the bandwidth which needs to be reserved by the routing node for forwarding the service data. And the routing node judges whether resources are reserved for the service data or not according to the outermost layer label of the received service data, and if so, the reserved resources are used for forwarding the service data.
The data format of the resource reservation object further comprises: a link address field, a bandwidth reservation direction field. The link address field is used for transmitting the link address of the routing node, and the bandwidth reservation direction field is used for transmitting the reservation direction of the routing node for reserving the bandwidth, wherein the reservation direction comprises the following steps: and receiving and sending service data. The link address of the routing node is encapsulated in a type length value TLV, and the link address comprises: IPV4, IPV6 address.
In one embodiment, as shown in fig. 3, an Object Type is newly defined, i.e. an Object is reserved for the resource, based on the current specification of the PCEP protocol. The reserved bandwidth required by the link corresponding to the node is transmitted based on the Object Type. The resource reservation Object contains four key fields: the Label ID field is used for transmitting Segment Routing Label used for forwarding at the node, the Reserved Bandwidth field is used for transmitting the Bandwidth needing to be Reserved, the Interface IP Address field is used for transmitting the link Address of the corresponding node, and the In/Out field is used for transmitting the direction of the Reserved Bandwidth.
And the Segment Routing Label in the Label ID field corresponds to the outermost Label used by the corresponding node on the forwarding path. The Reserved Bandwidth field is in a format consistent with the current PCEP BADNWIDTH Object. The Interface IP Address field is encapsulated by adopting a TLV mode and can identify IPv4Address and IPv6 Address. And if the value of the In/Out field is 0, reserving the bandwidth In the In direction of the link, and if the value of the In/Out field is 1, reserving the bandwidth In the Out direction of the link.
Fig. 4 is a schematic diagram of a scheduling process of a traffic centralized optimization scheduling system implemented based on an extended PCEP protocol, as shown in fig. 4: and the flow analysis system receives a guarantee strategy for service flow issued by a user, and the PCE calculates a plurality of pieces of LSP tunnel information for the service flow and flow category information corresponding to the LSP tunnel information according to the flow information of the service flow and the network utilization rate information.
After expanding the PCEP, the PCE collectively calculates an end-to-end path that can ensure the service performance, and may issue bandwidth reservation information of the Label allocated to Segment Routing to the router on the forwarding path in addition to issuing the corresponding Segment Routing Label information to the source node. When the routers C1, C4, C3 and C2 on the forwarding path receive the bandwidth reservation information, bandwidth reservation can be carried out on the traffic, subsequent traffic is prevented from occupying the bandwidth on a physical link on the forwarding path, the PCE path frequent calculation caused by the change of the network traffic is avoided, manual intervention is not needed in the whole process, and the automation level of traffic adjustment is greatly improved.
The network resource reservation method provided by the embodiment issues resource reservation information to a routing node through which a forwarding path passes, and reserves a link bandwidth of the passing node in advance on the basis of global optimization path calculation, so that frequent recalculation of a PCE caused by subsequent flow change is reduced, and the performance of an SDN controller is improved; the centralized automatic flow regulation can be realized, the expansion is carried out based on the existing PCEP protocol, and the implementation is easy.
In one embodiment, as shown in fig. 5, the present invention provides a path computation element PCE50, comprising: a path calculation module 51, a resource reservation transmission module 52 and a resource reservation determination module 53. The path calculation module 51 calculates a forwarding path for traffic data based on the traffic scheduling policy. The resource reservation sending module 52 issues resource reservation information to the routing nodes passed by the forwarding path. The resource reservation information includes: label information of the service data, bandwidth reservation information corresponding to the label information, and the like. And the routing node sets reserved resources for the forwarding of the service data according to the resource reservation information.
The resource reservation determining module 53 determines the routing node through which the forwarding path passes according to the forwarding path, and determines the resource that the routing node needs to reserve for forwarding the service data. The resource reservation sending module 52 issues resource reservation information to the routing node based on an extended PCEP protocol message, where the extended PCEP protocol message includes: extended PCReq messages, extended PCNtf messages, etc.
The extended PCEP protocol message carries a resource reservation object, which is used to transmit resource reservation information. The resource reservation transmitting module 52 generates a resource reservation object, and the data format of the resource reservation object includes: a label field, a bandwidth reservation field. The label field is used for transmitting label information of the service data, and the bandwidth reservation field is used for transmitting the bandwidth which needs to be reserved for forwarding the service data by the routing node. The label information can be an outermost label used by the service data, the routing node judges whether resources are reserved for the service data according to the outermost label of the received service data, and if so, the reserved resources are used for forwarding the service data.
The data format of the resource reservation object further comprises: a link address field, a bandwidth reservation direction field. The link address field is used for transmitting the link address of the routing node, and the bandwidth reservation direction field is used for transmitting the reservation direction of the routing node for reserving the bandwidth, wherein the reservation direction comprises the following steps: and receiving and sending service data. The link address of the routing node is encapsulated in a type length value TLV, and the link address comprises: IPV4, IPV6 address.
In one embodiment, the present invention provides an SDN network system, comprising: a routing node, such as a PCE as above.
The network resource reservation method, the PCE and the SDN network system provided in the foregoing embodiments issue resource reservation information to a routing node through which a forwarding path passes, and reserve a link bandwidth of the passing node in advance on the basis of global optimized path computation, thereby reducing frequent recalculation of the PCE caused by subsequent traffic change, and improving performance of an SDN controller; the centralized automatic adjustment of the flow can be realized, the expansion is carried out based on the existing PCEP protocol, and the implementation is easy; the method and the system can realize the flow centralized scheduling in the complex network environment, realize the end-to-end path guarantee facing to specific services, and improve the flow scheduling and optimizing capability of operators in the network.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (9)
1. A method for reserving network resources, comprising:
a Path Computation Element (PCE) computes a forwarding path for service data based on a flow scheduling strategy;
the PCE issues resource reservation information to the routing node passed by the forwarding path, wherein the resource reservation information comprises: label information of service data and bandwidth reservation information corresponding to the label information;
the routing node sets reserved resources for the forwarding of the service data according to the resource reservation information;
the step of the PCE issuing the resource reservation information to the routing node passed by the forwarding path includes:
the PCE determines a routing node through which the forwarding path passes according to the forwarding path, and determines a bandwidth which needs to be reserved for forwarding the service data by the routing node; the PCE transmits the resource reservation information to the routing node based on the extended PCEP protocol message;
wherein, the extended PCEP protocol message carries a resource reservation object, and the resource reservation object is used for transmitting the resource reservation information; the data format of the resource reservation object comprises: a label field, a bandwidth reservation field; the label field is used for transmitting label information of the service data, and the bandwidth reservation field is used for transmitting the bandwidth which is required to be reserved for forwarding the service data by the routing node;
the label information is an outermost label used by the service data; and the routing node judges whether bandwidth resources are reserved for the service data or not according to the outmost label of the received service data, and if so, the reserved bandwidth resources are used for forwarding the service data.
2. The method of claim 1,
the data format of the resource reservation object further comprises: a link address field, a bandwidth reservation direction field;
wherein the link address field is used for transmitting a link address of the routing node, the bandwidth reservation direction field is used for transmitting a reservation direction of the routing node for reserving bandwidth, and the reservation direction comprises: and receiving and sending service data.
3. The method of claim 2,
the link address of the routing node is encapsulated in a type length value TLV;
wherein the link address comprises: IPV4, IPV6 address.
4. The method of claim 2,
the extended PCEP protocol message includes: an extended PCReq message, an extended PCNtf message.
5. A path computation element, PCE, comprising:
the path calculation module is used for calculating a forwarding path for the service data based on the flow scheduling strategy;
a resource reservation sending module, configured to issue resource reservation information to a routing node through which the forwarding path passes, where the resource reservation information includes: label information of service data and bandwidth reservation information corresponding to the label information;
the routing node sets reserved resources for the forwarding of the service data according to the resource reservation information;
a resource reservation determining module, configured to determine, according to the forwarding path, a routing node through which the forwarding path passes, and determine a bandwidth that needs to be reserved for forwarding the service data by the routing node;
the resource reservation sending module is used for sending the resource reservation information to the routing node based on the extended PCEP protocol message;
the extended PCEP protocol message carries a resource reservation object, wherein the resource reservation object is used for transmitting the resource reservation information;
the resource reservation transmitting module is used for generating the resource reservation object; the data format of the resource reservation object comprises: a label field, a bandwidth reservation field; the label field is used for transmitting label information of the service data, and the bandwidth reservation field is used for transmitting the bandwidth which is required to be reserved for forwarding the service data by the routing node;
the label information is an outermost label used by the service data; and the routing node judges whether bandwidth resources are reserved for the service data or not according to the outmost label of the received service data, and if so, the reserved bandwidth resources are used for forwarding the service data.
6. The PCE of claim 5,
the data format of the resource reservation object further comprises: a link address field, a bandwidth reservation direction field;
wherein the link address field is used for transmitting a link address of the routing node, the bandwidth reservation direction field is used for transmitting a reservation direction of the routing node for reserving bandwidth, and the reservation direction comprises: and receiving and sending service data.
7. The PCE of claim 6,
the link address of the routing node is encapsulated in a type length value TLV;
wherein the link address comprises: IPV4, IPV6 address.
8. The PCE of claim 5,
the extended PCEP protocol message includes: an extended PCReq message, an extended PCNtf message.
9. An SDN network system, comprising:
a routing node, a PCE according to any of claims 5 to 8.
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