CN108234355A - A kind of network resource reservation based on moving speed method, PCE and SDN network system - Google Patents
A kind of network resource reservation based on moving speed method, PCE and SDN network system Download PDFInfo
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- CN108234355A CN108234355A CN201611156262.2A CN201611156262A CN108234355A CN 108234355 A CN108234355 A CN 108234355A CN 201611156262 A CN201611156262 A CN 201611156262A CN 108234355 A CN108234355 A CN 108234355A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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Abstract
The invention discloses a kind of network resource reservation based on moving speed method, PCE and SDN network systems, are related to the communications field, and method therein includes：PCE goes out the forward-path for business datum based on flow scheduling policy calculation；PCE reserves information to the routing node down distributing resource that forward-path passes through, and resource reservation information includes：The label information of business datum and the corresponding bandwidth reservation information of label information；Routing node is according to resource reservation information for the reserved resource of forwarding setting of business datum.Method, PCE and the SDN network of the present invention, on the basis of global optimization path computing, to link bandwidth through node carry out advance reservation, PCE caused by reducing follow-up changes in flow rate is frequently recalculated, and promotes SDN controller performances；It is extended based on existing PCEP agreements, it is easy to implement；It can realize the flow centralized dispatching under complex network environment, flow scheduling, the optimization ability of operator in a network can be promoted.
Description
Technical field
The present invention relates to a kind of field of communication technology more particularly to network resource reservation based on moving speed method, PCE and SDN network systems.
Background technology
Under SDN (Software Defined Network, software defined network) network architecture, path optimizing is asked
It asks, calculate and generally come by PCEP (Path Computation Element Protocol, path computation element protocol) agreement
It realizes.Segment Routing are a kind of source routing mechanism, will provide the ability quickly interacted with upper layer application for network.
Segment Routing are also based on Tag switching, but need to assist by outside LDP, RSVP etc. with MPLS network
View realizes that the functions such as distribution, the TE of label are different, and Segment Routing only simply expand existing IGP agreements
Exhibition, it is possible to realize the functions such as TE, FRR, MPLS VPN.Segment Routing are by being directed to IGP protocol extensions to transmit
The Label of the network elements such as Node, Link, realization process acquire link topology and data on flows in real time generally by SDN controllers,
Centralized calculation can guarantee the path of business end to end performance；Source is sent in data and is pressed directly into multilayer Label, to control data
The trend of stream realizes the real-time guarantees of service-oriented.In being forwarded for business datum by Segment Routing data surfaces
Label, path and treatment mechanism are as shown in Figure 1.Due to existing Segment Routing label forwardings realization not against
The RSVP protocol of traditional distributed, it is difficult to realize service path bandwidth reservation end to end, when network flow variation is more frequent,
The router-level topology function of concentration can be constantly triggered, larger pressure is formed to SDN controllers.
Invention content
In view of this, the invention solves a technical problem be to provide a kind of network resource reservation based on moving speed method, PCE and
SDN network system.
According to one embodiment of present invention, a kind of network resource reservation based on moving speed method is provided, including：Path-calculating element PCE
Forward-path for business datum is gone out based on flow scheduling policy calculation；The routing that the PCE passes through to the forward-path
Node down distributing resource reserves information, wherein, the resource reservation information includes：The label information of business datum and the label
The corresponding bandwidth reservation information of information；The routing node turns the business datum according to the resource reservation information
The reserved resource of hair setting.
Optionally, the PCE reserves information to the routing node down distributing resource that the forward-path passes through and includes：It is described
PCE determines the routing node that the forward-path passed through according to the forward-path, and determines the routing node to described
The forwarding of business datum needs reserved bandwidth；PCEP protocol messages of the PCE based on extension is issued to the routing node
The resource reservation information.
Optionally, resource reservation objects are carried in the PCEP protocol messages of the extension, wherein, the resource reservation pair
As being used for transmission the resource reservation information.
Optionally, the data format of the resource reservation objects includes：Label field, bandwidth reservation field；Wherein, it is described
Label field is used for transmission the label information of the business datum, and the bandwidth reservation field is used for transmission the routing node pair
Reserved bandwidth is needed in the forwarding of the business datum.
Optionally, the label information is outermost layer label used in the business datum；The routing node according to
The outermost layer label of the business datum received judges whether that business datum has reserved bandwidth resources thus, if it is, using
The reserved bandwidth resources forward this business datum.
Optionally, the data format of the resource reservation objects further includes：Link address field, bandwidth reservation direction word
Section；Wherein, the link address field is used for transmission the link address of the routing node, and bandwidth reservation direction field is used
In transmitting reserved direction of the routing node for reservation bandwidth, the reserved direction includes：Business datum receives, business number
According to transmission.
Optionally, the link address of the routing node is encapsulated in type lengths values TLV；Wherein, the link address
Including：IPV4, IPv6 address.
Optionally, the PCEP protocol messages of the extension include：The PCRep message of extension, the PCNtf message of extension.
According to another aspect of the present invention, a kind of path-calculating element PCE is provided, including：Path calculation module, for base
Go out the forward-path for business datum in flow scheduling policy calculation；Resource reservation sending module, for the forwarding road
The routing node down distributing resource that diameter passes through reserves information, and the resource reservation information includes：The label information of business datum and institute
State the corresponding bandwidth reservation information of label information；Wherein, the routing node according to the resource reservation information for described
The reserved resource of forwarding setting of business datum.
Optionally, resource reservation determining module, for determining what the forward-path was passed through according to the forward-path
Routing node, and determine that the routing node needs reserved bandwidth to the forwarding of the business datum；The resource reservation hair
Module is sent, the resource reservation information is issued to the routing node for the PCEP protocol messages based on extension.
Optionally, resource reservation objects are carried in the PCEP protocol messages of the extension, wherein, the resource reservation pair
As being used for transmission the resource reservation information.
Optionally, the resource reservation sending module, for generating the resource reservation objects；Wherein, the resource is pre-
The data format of object is stayed to include：Label field, bandwidth reservation field；The label field is used for transmission the business datum
Label information, the bandwidth reservation field is used for transmission the routing node needs what is reserved for the forwarding of the business datum
Bandwidth.
Optionally, the label information is outermost layer label used in the business datum；The routing node according to
The outermost layer label of the business datum received judges whether that business datum has reserved bandwidth resources thus, if it is, using
The reserved bandwidth resources forward this business datum.
Optionally, the data format of the resource reservation objects further includes：Link address field, bandwidth reservation direction word
Section；Wherein, the link address field is used for transmission the link address of the routing node, and bandwidth reservation direction field is used
In transmitting reserved direction of the routing node for reservation bandwidth, the reserved direction includes：Business datum receives, business number
According to transmission.
Optionally, the link address of the routing node is encapsulated in type lengths values TLV；Wherein, the link address
Including：IPV4, IPv6 address.
Optionally, the PCEP protocol messages of the extension include：The PCRep message of extension, the PCNtf message of extension.
According to another aspect of the invention, a kind of SDN network system is provided, including：Routing node, such as claim 9 to
16 any one of them PCE.
Network resource reservation based on moving speed method, PCE and the SDN network system of the present invention, passes through the routing section passed through to forward-path
Point down distributing resource reserves information, on the basis of global optimization path computing, to the link bandwidth through node carry out it is pre- in advance
It stays, PCE caused by reducing follow-up changes in flow rate is frequently recalculated, and promotes SDN controller performances；The centralization of flow can be achieved
Adjust automatically is extended based on existing PCEP agreements, easy to implement, can promote the flow tune of operator in a network
Degree, optimization ability.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, also
Other attached drawings can be obtained according to these attached drawings.
Fig. 1 is the label forwarding schematic diagram of the prior art based on Segment Routing agreements；
Fig. 2 is the flow diagram according to one embodiment of the network resource reservation based on moving speed method of the present invention；
Fig. 3 is the data lattice of the resource reservation objects in one embodiment according to the network resource reservation based on moving speed method of the present invention
Formula schematic diagram；
Fig. 4 is the dispatch deal schematic diagram of Optimal Scheduling in the flow set based on the PCEP protocol realizations after extension；
Fig. 5 is the module diagram according to the PCE of the present invention.
Specific embodiment
The present invention is described more fully with reference to the accompanying drawings, wherein illustrating exemplary embodiment of the present invention.Under
The attached drawing that face will be combined in the embodiment of the present invention, is clearly and completely described the technical solution in the embodiment of the present invention, shows
So, described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based on the reality in the present invention
Apply example, those of ordinary skill in the art's all other embodiments obtained without making creative work all belong to
In the scope of protection of the invention.Various descriptions are carried out to technical scheme of the present invention with reference to each figure and embodiment.
Flow diagrams of the Fig. 2 for one embodiment of the network resource reservation based on moving speed method according to the present invention, as shown in Figure 2：
Step 201, PCE (Path Computation Elementation, path-calculating element) is based on flow scheduling plan
Approximation calculates the forward-path for business datum.
Step 202, PCE reserves information to the routing node down distributing resource that forward-path passes through, and resource reservation information includes：
The label information of business datum and the corresponding bandwidth reservation information of label information etc..Label is Segment Routing agreements
Label.
Step 203, for routing node according to resource reservation information for the reserved resource of forwarding setting of business datum, resource can
To be bandwidth etc..
PCE determines the routing node that forward-path passed through according to forward-path, and determines routing node to business datum
Forwarding need reserved resource.PCE can reserve information based on the PCEP protocol messages of extension to routing node down distributing resource,
The PCEP protocol messages of extension can be the PCRep message of extension, the PCNtf message extended etc..
A variety of extended modes may be used in PCEP agreements, for resource reservation information to be sent to routing node.Routing section
Point can be router etc., and PCC can be set on routing node.PCEP agreements are PCC (Path Computation
Client, path calculating client) communication protocol between PCE.A series of Object Class of PCEP protocol definitions, are used for
Some constraintss in transmission path calculating process, such as the bandwidth required by the starting point of path optimizing, path optimizing, optimization
The information such as the intermediate node passed through needed for path.But in ObjectClass as defined in Current protocol, resource reservation letter is not transmitted
The Object of breath.
Resource reservation objects are carried in the PCEP protocol messages of extension, resource reservation objects are used for transmission resource reservation letter
Breath.Resource reservation objects are sent to routing node by PCE, and existing PCEP agreements are expanded, and newly define a kind of transmission resource
It is reserved with corresponding Object, to realize reserving automatically for flow centralized calculation based on Business Stream and resource.
Network resource reservation based on moving speed method in above-described embodiment expands existing PCEP agreements, defines a kind of to data
Routing node in forward-path issues the Object of reserved bandwidth, to carry out the pre- of bandwidth on the path calculated in advance
It stays, so as to ensure that follow-up non-guarantee flow will not seize the bandwidth reserved, realizes when flow changes, without PCE
Path centralized calculation is re-started again and forwarding strategy re-issues, so as to mitigate the pressure of SDN controllers.
The data format of resource reservation objects includes：Label field, bandwidth reservation field.Label field is used for transmission business
The label information of data, label information can be outermost layer label used in business datum.Bandwidth reservation field is used for transmission
Routing node needs reserved bandwidth to the forwarding of business datum.Routing node is according to the outermost layer mark of the business datum received
Label judge whether that business datum has reserved resource thus, if it is, using reserved this business datum of resource forwarding.
The data format of resource reservation objects further includes：Link address field, bandwidth reservation direction field.Link address word
Section is used for transmission the link address of routing node, and bandwidth reservation direction field is used for transmission routing node for retaining the pre- of bandwidth
Direction is stayed, reserved direction includes：Business datum receives, business datum is sent.It is long that the link address of routing node is encapsulated in type
In angle value TLV, link address includes：IPV4, IPv6 address.
In one embodiment, as shown in figure 3, based on PCEP agreement current regulations, an Object Type is newly defined,
As resource reservation objects.Reserved bandwidth needed for the node respective links is transmitted based on the Object Type.Resource reservation
Four critical fielies are included in object Object：Label id fields are used for transmission in node forwarding Segment used
Routing Label, Reserved Bandwidth fields are used for transmission the bandwidth for needing to retain, Interface IP
Address fields are used for transmission the link address of corresponding node, and In/Out fields are used for transmission the direction of reserved bandwidth.
Segment Routing Label in Label id fields are corresponded on forward-path used in corresponding node most
Outer layer label.Reserved Bandwidth fields use the form consistent with current PC EP BADNWIDTH Object.
Interface IP Address fields are encapsulated using TLV modes, can identify IPv4Address, IPv6Address.In/Out
Field is assigned a value of 0, then link In pattern bandwidths retain, and In/Out fields are assigned a value of 1, then link Out reserves bandwidth in direction.
Fig. 4 is the dispatch deal schematic diagram of Optimal Scheduling in the flow set based on the PCEP protocol realizations after extension,
As shown in Figure 4：Flow analysis system receives the guarantee strategies for service traffics that user issues, and PCE is according to Business Stream
Flow information and network utilization information are calculated for a plurality of lsp tunnel information of Business Stream and are believed with lsp tunnel
Cease corresponding traffic classes information.
After being extended to PCEP, PCE centralized calculation go out one can guarantee the end-to-end path of service feature after, in addition to
It issues outside corresponding Segment Routing label informations, can also be issued to the router on forward-path pair to source node
Segment Routing distribute the bandwidth reservation information of Label.C1, C4, C3, C2 routing of router on forward-path
Device is receiving bandwidth reservation information, can be directed to such flow and carry out bandwidth reservation, prevent rear afterflow rate from occupying on forward-path
Bandwidth on physical link avoids the PCE paths caused by network flow changes and frequently calculates, also, whole process
Without manual intervention, the automatization level of flow adjustment is substantially improved.
The network resource reservation based on moving speed method that above-described embodiment provides, the routing node down distributing resource passed through to forward-path are reserved
Information, on the basis of global optimization path computing, to link bandwidth through node carry out advance reservation, afterflow rate after reduction
PCE is frequently recalculated caused by variation, promotes SDN controller performances；The centralization adjust automatically of flow can be achieved, based on existing
There are PCEP agreements to be extended, it is easy to implement.
In one embodiment, as shown in figure 5, the present invention provides a kind of path-calculating element PCE50, including：It counts in path
Calculate module 51, resource reservation sending module 52 and resource reservation determining module 53.Path calculation module 51 is based on flow scheduling plan
Approximation calculates the forward-path for business datum.The routing node that resource reservation sending module 52 passes through to forward-path issues
Resource reservation information.Resource reservation information includes：The label information of business datum is believed with the corresponding bandwidth reservation of label information
Breath etc..Routing node is according to resource reservation information for the reserved resource of forwarding setting of business datum.
Resource reservation determining module 53 determines the routing node that forward-path passed through according to forward-path, and determines routing
Node needs reserved resource to the forwarding of business datum.PCEP protocol message of the resource reservation sending module 52 based on extension to
Routing node down distributing resource reserves information, and the PCEP protocol messages of extension include：The PCRep message of extension, the PCNtf of extension disappear
Breath etc..
Resource reservation objects are carried in the PCEP protocol messages of extension, resource reservation objects are used for transmission resource reservation letter
Breath.Resource reservation sending module 52 generates resource reservation objects, and the data format of resource reservation objects includes：Label field, band
Bandwidth reservation field.Label field is used for transmission the label information of business datum, and bandwidth reservation field is used for transmission routing node pair
The forwarding of business datum needs reserved bandwidth.Label information can be outermost layer label used in business datum, and routing saves
Point judges whether that business datum has reserved resource thus according to the outermost layer label of business datum received, if it is, making
With this business datum of reserved resource forwarding.
The data format of resource reservation objects further includes：Link address field, bandwidth reservation direction field.Link address word
Section is used for transmission the link address of routing node, and bandwidth reservation direction field is used for transmission routing node for retaining the pre- of bandwidth
Direction is stayed, reserved direction includes：Business datum receives, business datum is sent.It is long that the link address of routing node is encapsulated in type
In angle value TLV, link address includes：IPV4, IPv6 address.
In one embodiment, the present invention provides a kind of SDN network system, including：Routing node, PCE as above.
Network resource reservation based on moving speed method, PCE and the SDN network system that above-described embodiment provides, the road passed through to forward-path
Information is reserved by node down distributing resource, on the basis of global optimization path computing, to the link bandwidth through node carry
Preceding reserved, PCE caused by reducing follow-up changes in flow rate is frequently recalculated, and promotes SDN controller performances；The collection of flow can be achieved
Middleization adjust automatically is extended based on existing PCEP agreements, easy to implement；It can realize the flow under complex network environment
The end-to-end path guarantee towards specific transactions is realized in centralized dispatching, can promote operator's flow scheduling in a network, excellent
Change ability.
The method and system of the present invention may be achieved in many ways.For example, can by software, hardware, firmware or
Software, hardware, firmware any combinations come realize the present invention method and system.The said sequence of the step of for method is only
In order to illustrate, the step of method of the invention, is not limited to sequence described in detail above, especially says unless otherwise
It is bright.In addition, in some embodiments, the present invention can be also embodied as recording program in the recording medium, these programs include
It is used to implement machine readable instructions according to the method for the present invention.Thus, the present invention also covering storage is for execution according to this hair
The recording medium of the program of bright method.
Description of the invention provides for the sake of example and description, and is not exhaustively or will be of the invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those of ordinary skill in the art is enable to manage
The solution present invention is so as to design the various embodiments with various modifications suitable for special-purpose.
Claims (17)
- A kind of 1. network resource reservation based on moving speed method, which is characterized in that including：Path-calculating element PCE goes out the forward-path for business datum based on flow scheduling policy calculation；The PCE reserves information to the routing node down distributing resource that the forward-path passes through, wherein, the resource reservation information Including：The label information of business datum and the corresponding bandwidth reservation information of the label information；The routing node is according to the resource reservation information for the reserved resource of forwarding setting of the business datum.
- 2. the method as described in claim 1, which is characterized in that the PCE is under the routing node that the forward-path passes through Hair resource reservation information includes：The PCE determines the routing node that the forward-path passed through according to the forward-path, and determines the routing section Point needs reserved bandwidth to the forwarding of the business datum；PCEP protocol messages of the PCE based on extension issues the resource reservation information to the routing node.
- 3. method as claimed in claim 2, which is characterized in thatResource reservation objects are carried in the PCEP protocol messages of the extension, wherein, the resource reservation objects are used for transmission The resource reservation information.
- 4. method as claimed in claim 3, which is characterized in thatThe data format of the resource reservation objects includes：Label field, bandwidth reservation field；Wherein, the label field is used for transmission the label information of the business datum, and the bandwidth reservation field is used for transmission The routing node needs reserved bandwidth for the forwarding of the business datum.
- 5. method as claimed in claim 4, which is characterized in that the label information is outermost layer used in the business datum Label；The routing node judges whether that business datum has reserved band thus according to the outermost layer label of the business datum received Wide resource, if it is, forwarding this business datum using the reserved bandwidth resources.
- 6. method as claimed in claim 4, which is characterized in thatThe data format of the resource reservation objects further includes：Link address field, bandwidth reservation direction field；Wherein, the link address field is used for transmission the link address of the routing node, bandwidth reservation direction field Reserved direction of the routing node for reservation bandwidth is used for transmission, the reserved direction includes：Business datum receives, business Data are sent.
- 7. method as claimed in claim 6, which is characterized in thatThe link address of the routing node is encapsulated in type lengths values TLV；Wherein, the link address includes：IPV4, IPv6 address.
- 8. method as claimed in claim 2, which is characterized in thatThe PCEP protocol messages of the extension include：The PCRep message of extension, the PCNtf message of extension.
- 9. a kind of path-calculating element PCE, which is characterized in that including：Path calculation module, for going out the forward-path for business datum based on flow scheduling policy calculation；Resource reservation sending module, the routing node down distributing resource for passing through to the forward-path reserve information, wherein, institute Resource reservation information is stated to include：The label information of business datum and the corresponding bandwidth reservation information of the label information；Wherein, the routing node reserves resource according to the resource reservation information for the forwarding setting of the business datum.
- 10. PCE as claimed in claim 9, which is characterized in that including：Resource reservation determining module, for determining routing node that the forward-path passed through according to the forward-path, and Determine that the routing node needs reserved bandwidth to the forwarding of the business datum；The resource reservation sending module issues the resource for the PCEP protocol messages based on extension to the routing node Reserved information.
- 11. PCE as claimed in claim 10, which is characterized in thatResource reservation objects are carried in the PCEP protocol messages of the extension, wherein, the resource reservation objects are used for transmission The resource reservation information.
- 12. PCE as claimed in claim 11, which is characterized in thatThe resource reservation sending module, for generating the resource reservation objects；Wherein, the data format of the resource reservation objects includes：Label field, bandwidth reservation field；The label field is used In the label information for transmitting the business datum, the bandwidth reservation field is used for transmission the routing node for the business The forwarding of data needs reserved bandwidth.
- 13. PCE as claimed in claim 12, which is characterized in that the label information for used in the business datum most Outer layer label；The routing node judges whether that business datum has reserved band thus according to the outermost layer label of the business datum received Wide resource, if it is, forwarding this business datum using the reserved bandwidth resources.
- 14. PCE as claimed in claim 12, which is characterized in thatThe data format of the resource reservation objects further includes：Link address field, bandwidth reservation direction field；Wherein, the link address field is used for transmission the link address of the routing node, bandwidth reservation direction field Reserved direction of the routing node for reservation bandwidth is used for transmission, the reserved direction includes：Business datum receives, business Data are sent.
- 15. PCE as claimed in claim 14, which is characterized in thatThe link address of the routing node is encapsulated in type lengths values TLV；Wherein, the link address includes：IPV4, IPv6 address.
- 16. PCE as claimed in claim 10, which is characterized in thatThe PCEP protocol messages of the extension include：The PCRep message of extension, the PCNtf message of extension.
- 17. a kind of SDN network system, which is characterized in that including：Routing node, such as claim 9 to 16 any one of them PCE.
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| CN109617820A (en) * | 2019-02-15 | 2019-04-12 | 中国联合网络通信集团有限公司 | A kind of SDN system and route renewing method |
| CN112532522A (en) * | 2019-09-19 | 2021-03-19 | 中兴通讯股份有限公司 | Method and device for establishing service path and electronic equipment |
| CN112532522B (en) * | 2019-09-19 | 2023-09-05 | 中兴通讯股份有限公司 | Service path establishing method and device and electronic equipment |
| CN114553729A (en) * | 2020-11-26 | 2022-05-27 | 中国移动通信有限公司研究院 | Quality of service (QoS) measurement method and device and computational node |
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