CN104579959A - Method and equipment for establishing label switching path of SDN stream in MPLS network - Google Patents
Method and equipment for establishing label switching path of SDN stream in MPLS network Download PDFInfo
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Abstract
The invention provides a method for establishing label switching path (LSP) on routing equipment of an MPLS core network. The method comprises the following steps: when an SDN stream from a software defined network (SDN) is received, mapping SDN stream information contained in the SDN stream to a forwarding equivalence class (FEC) and an SDN stream label stack; adding the FEC, the SDN stream label stack and the SDN stream information into an LSP label request; allocating the LSP label stack on the basis of the SDN stream information.
Description
Technical field
The present invention relates to the communications field, and more specifically, relate in traditional multiprotocol label switching MPLS core network for SDN stream sets up label switched path.
Background technology
The network (SDN) of software definition is arranged for and improves network performance, flexibility and manageability, accelerates thus to carry out by software the paces innovated.Subversive SDN technology now widely known to many operators (such as, AT & T, BT, China Mobile, Orange and Verizon etc.), and will at BBF(Broadband Forum) and ETSI(ETSI) in carry out standardization, as list of references Network Functions Virtualisation – IntroductoryWhite Paper, described in issue1.This list of references and other list of references, such as SDN World Congress(Germany, in October, 2012) and Software DefinedNetworking Summit(Britain, on November 13rd, 2012, http://sdnconference.com/) etc., all show SDN needs mixing and migration model, that is, SDN should in hybird environment with existing procotol co-operation.Therefore, the present invention considers how to be coupled SDN and traditional MPLS core network, to be devoted to solve following technical problem:
Problem one: existing label switched path (LSP) construction process does not distinguish LSP according to the matching field of SDN stream.
Such as, { dst.IP1, src.TCP port1; And { dst.IP1, src.TCP port2 * }; * } two different SDN streams with Different matching field can be represented.These streams can require to construct through traditional MPLS core network the LSP path that two have differentiation respectively.But, in existing LSP construction process, do not consider this point.
Problem two: existing LSP construction process does not distinguish LSP according to the operation setting of SDN stream.
Such as, { dst.IP1, Action:to central SDN controller}(operation setting shows " to SDN controller ") and dst.IP1, Action:Normal forwarding}(operation setting shows " generally forward ") but the SDN stream that two with identical match field different operating are different can be represented.These streams can require to construct the LSP that two have differentiation respectively.
In brief, the technical scheme also do not overcome the above problems at present, the present invention is intended to adjust existing LSP construction process to overcome the above problems.
Summary of the invention
Carried out brief overview in summary of the invention part to content of the present invention, this summary is some aspects in order to give prominence to and introduce different embodiment, but is not limit the scope of the invention.The follow-up concept being enough to those skilled in the art to be understood and uses the present invention to propose about detailed description of preferred embodiment.
The present invention is intended to adjust LSP construction process to consider that the support of SDN stream information has the transmission of SDN flow point group through traditional MPLS core network of differentiation.SDN is a kind of subversive technology, and is difficult to set up within the extremely short time.In order to protect up-front investment, expectation is realized SDN concept by Virtual network operator length by length.SDN must realize interoperability with existing network.For this reason, the present invention revises existing LSP building process, considers SDN stream information, for supporting that distinguishing SDN flows through traditional MPLS core network delivery.
According to an aspect of the present invention, provide a kind of method setting up label switching path LSP on the routing device of MPLS core network, the method comprises: when receiving the SDN stream from software defined network SDN, the SDN stream information that described SDN stream comprises is mapped to forwarding equivalence class FEC and SDN stream label stack; Described FEC, described SDN stream label stack and described SDN stream information are added in the request of LSP label; And, distribute LSP label stack based on described SDN stream information.
According to embodiments of the invention, described SDN stream information can comprise following in one or more: the identifier of SDN stream, matching field, operation setting and LSP requirement.
According to embodiments of the invention, the SDN information that the LSP label stack of different SDN stream can comprise based on different SDN stream is distinguished.
According to embodiments of the invention, after distribution LSP label, described LSP label, described SDN stream label are tied to described SDN stream information.
According to embodiments of the invention, the ID that the identifier of described SDN stream can be the ID of relevant SDN controlled entity, ID, SDN of relevant SDN Delivery Function flow, or their combination in any.Described matching field can comprise source/destination ethernet address/IP address, the source/destination TCP/UDP port of SDN stream, or their combination in any.Know with those skilled in the art know that, there is many variety classeses in the matching domain of SDN stream, and their combination in any is also possible, will not enumerate herein.In order to simplicity of exposition, only list common several herein.Operation setting can define the operation taked SDN stream.LSP requires to define the router quantitative requirement of such as LSP and/or bandwidth requirement and/or priority.
According to another aspect of the present invention, provide a kind of equipment setting up label switching path LSP in MPLS core network, this equipment comprises: mapping block, be configured to, when receiving the SDN stream from software defined network SDN, the SDN stream information that described SDN stream comprises is mapped to forwarding equivalence class FEC and SDN stream label stack; Add module, be configured to described FEC, described SDN stream label stack and described SDN stream information to add in the request of LSP label; And distribution module, is configured to distribute LSP label stack based on described SDN stream information.
According to embodiments of the invention, the equipment setting up label switching path LSP in MPLS core network comprises binding module further, described binding module is configured to, after distribution LSP label, described LSP label, described SDN stream label are tied to described SDN stream information.
The invention has the advantages that:
The transmission that 1.SDN flows through MPLS core network can be flowed matching field according to different SDN and be arranged and distinguish.
The transmission that 2.SDN flows through MPLS core network can be arranged according to different SDN flow operations to be distinguished.
3. the solution proposed is applied to all possible deployment scenario in Fig. 1 to 3.
4. the SDN stream label stack proposed can be applied to SDN further and flow traffic engineering.
Accompanying drawing explanation
Fig. 1-4 illustrates non-limiting example, and according to the specific descriptions below in conjunction with accompanying drawing, exemplary embodiment of the present invention will obtain clearer understanding, wherein:
Fig. 1,2 and 3 illustrates the scene about the SDN mixed and MPLS core network environment respectively.
Fig. 4 illustrates according to exemplary embodiment of the present invention, is transmitted the whole process of SDN flow point group by traditional MPLS core network.
Embodiment
Part of the present invention instead of whole embodiment are described below with reference to accompanying drawings.Certain the present invention can be implemented by many different forms, and should not be construed as and be only limitted to the embodiments described herein.
Fig. 1,2 and 3 illustrates the scene about the SDN mixed and core network environment respectively.
In the drawings, SDN-CE and SDN-FE represents SDN controlled entity and SDN Delivery Function respectively.Such as, under openflow environment, SDN-CE is controller and SDN-FE is openflow switch.
Fig. 1 illustrates scene 1, and wherein, two SDN substations are connected by traditional MPLS core network.Single SDN-CE100 controls SDN-FE101 ~ 104 in two substations.Fig. 2 illustrates scene 2, and wherein two SDN substations are connected by traditional MPLS core network.But sub-SDN-CE210 and 220 is respectively substation 1 and 2 and provides local controlling functions.Father SDN CE200 provides the overall controlling functions of whole SDN.Fig. 3 illustrates scene 3, wherein two independently SDN, and SDN 1 and SDN 2, connected by traditional MPLS core network.SDN-CE equipment 310 and 320 is respectively SDN 1 and 2 and provides controlling functions.
Mechanism of the present invention described below can be implemented in above three kinds of architectural frameworks, and certainly, in any other possible mixing SDN and MPLS architecture, the present invention is also feasible.
The following describes and consider that SDN stream information sets up the process of LSP.Fig. 4 illustrates the whole process being transmitted SDN flow point group by traditional MPLS core network.
Step S401:SDN-CE flows registration message M401 by the information registering of SDN stream 1 to ingress edge router LER1 by SDN.The identifier of SDN stream information comprises (but being not limited to) SDN stream and/or matching field and/or operation setting and/or LSP require.
It should be noted that:
The identifier of-SDN stream can be SDN-CE ID, SDN-FE ID, (local/overall situation) SDN flows ID etc., or their combination in any.
-matching field can comprise source/destination Ethernet/IP address, source/destination TCP/UDP port etc., or their combination in any.
-operation setting can be such as " transmission flow point group is to SDN-CE ", " being exported by port 3 " etc.
-LSP requires to be encoded with type-length-value (TLV) form.The example of the requirement of LSP can be: its corresponding priority of bandwidth sum etc. of maximum routers of LSP, maximum/minimum LSP.
-M401 is forwarded by Delivery Function SDN-FE1.According among embodiments of the invention, Delivery Function SDN-FE1 just carries out transparent forwarding, to M401 without any operation.It should be noted that hereinafter in order to be described clearly, discussed SDN be flowed and indicates with numeral " 1 ".
In step S402, when receiving M401, SDN is flowed the information MAP of 1 to { FEC1, SDN stream label stack 1} by LER1.Then, LER1 sends LSP label request message M402 to its next hop router (the LSR LSR namely in figure), and LSP label request message M402 comprises { information of FEC1, SDN stream label stack 1, SDN stream 1 }.
In step S403, when receiving M402, LSR records label request, and finds that it is not the object router of FEC1 itself.{ FEC2, SDN stream label stack 1, SDN flows the information of 1 } is mapped to { FEC1, SDN stream label stack 1, SDN flows the information of 1 } and sends M403 to its next hop router LER2 by LSR, and M403 comprises { FEC2, SDN stream label stack 1, SDN flows the information of 1 }.
In step s 404, when receiving M403, LER2 finds that it is the object router of FEC2.LER2 obtains SDN stream information from M403.LER2 registration maps { information of SDN stream label stack 1, SDN stream 1 }.Then, LER2 responds with label mapping message M404, label mapping message M404 comprises LSP label stack 2(is used for FEC2), SDN stream label stack 1}.
In step S405, when receiving M404, LSR confirms and label request dispatching LSP label stack 2 in corresponding M403.LSR then sends label mapping message M405 to LER1, comprise LSP label stack 1(is used for FEC1), SDN stream label stack 1}.
In step S406, when receiving M405, LER1 by whole label stack LSP label stack 1(be used for FEC1), SDN stream label stack 1} be mapped to SDN stream 1.Then, LER1 sends SDN streamer volume OK message M406 to SDN-CE, and M406 comprises identifier and other possible information of SDN stream 1.
Finally, consider the demand of SDN stream 1, the distinguishing LSP of SDN stream 1 is set up by MPLS core net.
It should be noted that the message in this process describes in an abstract way.Those skilled in the art can implement these message by the agreement of any reality.
According to the instruction with reference to Fig. 4, those skilled in the art it is contemplated that out the embodiment of the equipment realizing above-mentioned flow process, this equipment such as comprises: mapping block, be configured to, when receiving the SDN stream from software defined network SDN, the SDN stream information that described SDN stream comprises is mapped to forwarding equivalence class FEC and SDN stream label stack; Add module, be configured to described FEC, described SDN stream label stack and described SDN stream information to add in the request of LSP label; And distribution module, is configured to distribute LSP label stack based on described SDN stream information.
Above apparatus embodiments is not only confined to tag edge router LER1, LER2 shown in Fig. 4 and LSR LSR, and described equipment can embed with dispersion or the form concentrated or install router in an mpls network or other are exclusively used in the equipment of this object.
In the above description, corresponding module can be used as program module or functional processing (comprises routine, program, object, assembly, data result etc., it performs particular task or realizes particular abstract data type, and existing hardware can be used to realize at existing network unit or Controlling vertex place) realize.Such existing hardware can comprise one or more CPU (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) computer etc.
Those skilled in the art should recognize, typically encoding in the aspect of software simulating of the present invention on certain program recorded medium, or realizes on the transmission medium of some types.Program recorded medium can be (such as the compact disk read-only memory or " CD ROM ") of magnetic (such as floppy disk or hard disk drive) or light, and can be read-only or arbitrary access.
The various amendment of setting forth here and other embodiments benefit from making various equivalent modifications the instruction provided in above specification and relevant drawings.Therefore, can understand, the invention is not restricted to disclosed specific embodiment, and amendment and other embodiments are intended to comprise within the scope of the appended claims.In addition, although above specification and relevant drawings describe the exemplary embodiment in the environment of certain example combinations of parts and/or function, it should be understood that, the various combination of parts and/or function provides by alternative, and does not depart from the scope of claims.Thus, such as, as set forth in some claims those, also can imagine their various combination except those above clear and definite described parts and/or function.Although the particular term adopted here, they are only used as general and descriptive sense, the order not for limiting.
Claims (11)
1. on the routing device of MPLS core network, set up a method for label switching path LSP, the method comprises:
When receiving the SDN stream from software defined network SDN, the SDN stream information that described SDN stream comprises is mapped to forwarding equivalence class FEC and SDN stream label stack;
Described FEC, described SDN stream label stack and described SDN stream information are added in the request of LSP label; And
LSP label stack is distributed based on described SDN stream information.
2. method according to claim 1, wherein, described SDN stream information comprise following in one or more: the identifier of SDN stream, matching field, operation setting and LSP requirement.
3. method according to claim 2, wherein, the SDN information that the LSP label stack of different SDN stream comprises based on different SDN stream is distinguished.
4. method according to claim 1, comprises further, after distribution LSP label, described LSP label, described SDN stream label is tied to described SDN stream information.
5. method according to claim 1 and 2, the ID that the identifier of wherein said SDN stream is the ID of relevant SDN controlled entity, ID, SDN of relevant SDN Delivery Function flow, or their combination in any.
6. method according to claim 1 and 2, wherein said matching field comprises source/destination ethernet address/IP address, the source/destination TCP/UDP port of SDN stream, or their combination in any.
7. method according to claim 1 and 2, wherein operation setting defines the operation taked SDN stream.
8. method according to claim 1 and 2, wherein said LSP requires to define the router quantitative requirement of LSP and/or bandwidth requirement and/or priority.
9. in MPLS core network, set up an equipment for label switching path LSP, this equipment comprises:
Mapping block, is configured to, when receiving the SDN stream from software defined network SDN, the SDN stream information that described SDN stream comprises is mapped to forwarding equivalence class FEC and SDN stream label stack;
Add module, be configured to described FEC, described SDN stream label stack and described SDN stream information to add in the request of LSP label; And
Distribution module, is configured to distribute LSP label stack based on described SDN stream information.
10. equipment according to claim 9, wherein, described SDN stream information comprise following in one or more: the identifier of SDN stream, matching field, operation setting and LSP requirement.
11. equipment according to claim 9, comprise binding module further, and described binding module is configured to, after distribution LSP label, described LSP label, described SDN stream label are tied to described SDN stream information.
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