CN103973568A - Method and equipment for forwarding SDN (software defined network) flow on MPLS (multi-protocol label switching) core network - Google Patents
Method and equipment for forwarding SDN (software defined network) flow on MPLS (multi-protocol label switching) core network Download PDFInfo
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Abstract
The invention relates to a method and equipment for forwarding SDN (software defined network) flow on an MPLS (multi-protocol label switching) core network. According to an example embodiment, the method includes: at least partially based on SDN flow entries corresponding to SDN flow groups, acquiring SDN flow label stacks for the SDN flow groups; determining label switched path label stacks corresponding to the SDN flow label stacks for the SDN flow groups; at least partially based on the label switched path label stacks, forwarding a data packet on the MPLS core network, wherein the data packet at least includes the label switched path label stacks, the SDN flow label stacks and the SDN flow groups.
Description
Technical field
The forwarding of relate generally to of the present invention to data flow, and be particularly related to the method and apparatus for reflecting software define grid stream (SDN-flow) in the multiprotocol label switching (mpls) core net existing.
Background technology
SDN is a kind of powerful brand-new network schemer, and its innovation for core net and application provides good platform, and datum plane, control plane and the management plane of this theory to network has extensively and far-reaching influence.Dispose SDN and can improve performance, flexibility and the manageability of network, and accelerate thus the paces of innovation by software.Current, this disruptive technology of SDN has obtained the extensive accreditation of many Virtual network operators, and will such as, in multiple associations and tissue (ETSI (ETSI) and broadband forum (BBF) etc.), carry out standardization effort.
Numerous research shows that SDN needs mixed type migration model, and for instance, SDN should carry out interoperability with existing network protocol in hybird environment.Particularly, SDN is a disruptive technology and is difficult to build at short notice.In order to protect initial investment, Virtual network operator can be expected to realize SDN concept according to mode progressively.Thereby, need to design one and make SDN to carry out the scheme of interoperability with existing network (such as existing MPLS core net), thereby can realize the coupling between SDN network and existing MPLS core net.
Summary of the invention
In view of above reason, the present invention proposes a kind ofly for realizing the scheme that forwards SDN flow data grouping in MPLS core net, be intended to overcome at least one the problem existing in prior art.
According to a first aspect of the invention, provide a kind of for forwarding the method for SDN stream, described method comprises: the stream of the SDN based on corresponding with SDN flow point group entry at least in part, obtain the SDN stream label stack for described SDN flow point group; For described SDN flow point group is determined label switched path (LSP) label stack corresponding with described SDN stream label stack; And at least in part based on described LSP label stack, forwarding data grouping in MPLS core net, wherein, described packet at least comprises described LSP label stack, described SDN stream label stack and described SDN flow point group.
According to a second aspect of the invention, provide a kind of for forwarding the equipment of SDN stream, described equipment comprises: acquisition module, and it is configured to the stream of the SDN based on corresponding with SDN flow point group entry at least in part, obtains the SDN stream label stack for described SDN flow point group; Determination module, it is configured to determine the LSP label stack corresponding with described SDN stream label stack into described SDN flow point group; And forwarding module, it is configured at least in part based on described LSP label stack, forwarding data grouping in MPLS core net, and wherein, described packet at least comprises described LSP label stack, described SDN stream label stack and described SDN flow point group.
According to a third aspect of the invention we, provide a kind of for forwarding the method for SDN stream, described method comprises: in response to receive packet in MPLS core net, obtain SDN stream label stack, wherein, described packet at least comprises SDN flow point group and LSP label stack and described SDN stream label stack for described SDN flow point group; And forward described SDN flow point group based on described SDN stream label stack at least in part.
According to a forth aspect of the invention, provide a kind of for forwarding the equipment of SDN stream, described equipment comprises: acquisition module, it is configured in response to receive packet in MPLS core net, obtain SDN stream label stack, wherein, described packet at least comprises SDN flow point group and LSP label stack and described SDN stream label stack for described SDN flow point group; And forwarding module, it is configured to forward described SDN flow point group based on described SDN stream label stack at least in part.
By adopting according to the described scheme of exemplary embodiment of the present, can realize the efficient coupling of SDN and existing MPLS core net, thereby can distinguish SDN stream sending in MPLS core net according to different SDN stream matching field collection and/or behavior aggregate.In addition,, in the time adopting the described solution of exemplary embodiment, only need to revise network edge router, and do not need to revise intermediate router.
Brief description of the drawings
In claims, set forth novel features of the present invention.When read in conjunction with the accompanying drawings, by with reference to the following detailed description to illustrative embodiment, will understand best the present invention itself and preferably use pattern, and further object and advantage, in the accompanying drawings:
Fig. 1 is the schematic diagram according to exemplary embodiment of the present, and it has illustrated the forwarding to SDN flow point group in existing core net in the situation that having SDN stream label stack and LSP label stack;
Fig. 2 shows the scene 1 of mixed type SDN network and core net according to exemplary embodiment of the present invention;
Fig. 3 shows the scene 2 of mixed type SDN network and core net according to exemplary embodiment of the present invention;
Fig. 4 shows the scene 3 of mixed type SDN network and core net according to exemplary embodiment of the present invention;
Fig. 5 shows the flow chart of the method for forwarding SDN stream according to exemplary embodiment of the present invention;
Fig. 6 (a) has illustrated a kind of SDN stream label stack according to exemplary embodiment of the present invention;
Fig. 6 (b) has illustrated another kind of SDN stream label stack according to exemplary embodiment of the present invention;
Fig. 7 shows the flow chart of the method for forwarding SDN stream according to another exemplary embodiment of the present invention;
Fig. 8 shows the process of tunnel transmission SDN flow point group in existing MPLS core net according to exemplary embodiment of the present invention; And
Fig. 9 shows the schematic diagram of the equipment for forward SDN stream in MPLS core net according to exemplary embodiment of the present invention.
Embodiment
Describe below with reference to accompanying drawings embodiments of the invention in detail.Run through this specification, refer to feature, advantage or similarly wording not mean can utilize the present invention and realize all feature & benefits should or in any single embodiment of the present invention.On the contrary, be appreciated that the wording that relates to feature & benefits means that in conjunction with the embodiments described specific features, advantage or characteristic comprise at least one embodiment of the present invention.Thereby, running through this specification, the discussion to feature and advantage and similarly wording can refer to same embodiment, but the same embodiment of the definiteness that differs.In addition, described feature of the present invention, advantage and characteristic can merge in one or more embodiments in any suitable manner.Those skilled in the relevant art will recognize that, can one or more specific features of specific embodiment or advantage, put into practice the present invention in the case of not having.In other example, can realize in certain embodiments additional feature and advantage, it not necessarily comes across among all embodiment of the present invention.
It should be noted that, hereinafter described many aspects of the present invention according to the flow chart of the method for the embodiment of the present invention, unit, system and computer program and/or block diagram.In each square frame of flow chart and/or block diagram and flow chart and/or block diagram, the combination of each square frame, can be realized by computer program instructions.These computer program instructions can offer the processor of all-purpose computer, special-purpose computer or other programmable data processing unit, thereby produce a kind of machine, make these instructions of carrying out by computer or other programmable data processing unit, produce the device of the function/operation specifying in the square frame in realization flow figure and/or block diagram.Also these computer program instructions can be stored in energy command calculations machine or the computer-readable medium of other programmable data processing unit with ad hoc fashion work, like this, the instruction being stored in computer-readable medium produces a manufacture that comprises the command device of the function/operation specifying in the square frame in realization flow figure and/or block diagram.Computer program instructions can also be loaded on computer or other programmable data processing unit, make to carry out sequence of operations step on computer or other programmable data processing unit, to produce computer implemented process, thus the process of function/operation that the instruction of carrying out on computer or other programmable device specifies during the square frame in realization flow figure and/or block diagram is just provided.
Current SDN concept has caused the broad interest of service provider, IT supplier, technology suppliers and Virtual network operator etc.All advise considering SDN and existing network and agreement (for example, SDN and existing MPLS core net) are coupled such as the organisations and institutions of SDN world convention, virtual (NFV) white paper of network function and SDN summit etc.But, currently also do not propose effective scheme and solve the problem of carrying out effective interoperability between SDN and existing core net.A kind of situation existing is: existing tag edge router (LER) is not distinguished LSP according to the matching field collection of SDN stream.For instance, SDN stream entry { dst.IP@1, src.TCP port1; And { dst.IP@1, src.TCP port2 * }; * } can indicate and there is the SDN stream that two of Different matching field are different, and require two different LSP, but LER is but used as these two streams and has identical forwarding equivalence class (FEC) and process, and forward them by identical LSP.In this embodiment, the asterisk wildcard " * " in the operation field (such as behavior aggregate) of SDN stream entry can represent to implement any operation.Similarly, when adopt asterisk wildcard " * " in the matching field of SDN stream entry time, it can represent to mate any value.In addition, existing tag edge router is not distinguished LSP according to the behavior aggregate of SDN stream.For instance, { dst.IP@1, Action:to central SDNcontroller} is with { dst.IP@1, Action:Normal} can indicate has identical match field but two different SDN streams of different actions (action) to SDN stream entry.These two streams require two different LSP, but LER is but used as these two streams and has identical FEC and process, and forward them by identical LSP.Therefore, how need to consider SDN and existing MPLS core net to be coupled, be intended to solve at least one problem of the prior art.
According to exemplary embodiment of the present invention, by introducing SDN stream label stack (SDN-flow labelstack), the labeled packet that has strengthened existing MPLS core net edge router forwards scheme, thereby can distinguish sending SDN stream in existing MPLS core net.Fig. 1 is the schematic diagram according to exemplary embodiment of the present, and it has illustrated the forwarding to SDN flow point group in existing core net in the situation that having SDN stream label stack and LSP label stack.According to exemplary embodiment, SDN Delivery Function (for example SDN-FE1 in Fig. 1) can send to SDN flow point group the edge router (for example LER1 in Fig. 1) of core net, and this edge router can carry out extension tag stack space by introducing SDN stream label stack.As shown in Figure 1, this expansion has caused two kinds of label stacks: LSP label stack and SDN stream label stack.In the exemplary embodiment, edge router can arrive its corresponding SDN stream label stack by the SDN stream entry map of SDN flow point group, and determines at least in part the forwarding equivalence class (FEC) of SDN stream based on SDN stream label stack.For instance, SDN stream label stack can be determined the FEC of SDN stream, and can determine the corresponding LSP label stack of this FEC.Ingress edge router (for example LER1 in Fig. 1) can push (push) SDN stream label stack for SDN flow point group, and SDN flow point group can be forwarded to LSR (LSR as shown in Figure 1) together with SDN stream label stack and LSP label stack, and and then be forwarded to egress edge router (for example LER2 in Fig. 1).Egress edge router can eject (pop) SDN stream label stack, and received SDN flow point group is delivered to SDN Delivery Function (for example SDN-FE2 in Fig. 1) and the corresponding port that will go to.The scheme that it should be noted that exemplary embodiment of the present does not change (no matter being on the edge router such as LER1 or on the intermediate router such as LSR) forwarding to labeled packet in existing core net.In fact, can like that for example forward packet based on LSP label stack according to the forwarding scheme of usual employing.In addition it is pointed out that the scheme according to exemplary embodiment, intermediate router does not need to know the existence of SDN stream label stack.
Fig. 2, Fig. 3 show respectively the three kind scenes relevant with core net environment with mixed type SDN network with Fig. 4.According to exemplary embodiment of the present invention, SDN-CE and SDN-FE can represent respectively SDN controlled entity and SDN Delivery Function.For instance, in the situation of OpenFlow, SDN-CE can be controller, and SDN-FE can be OpenFlow switch.
Fig. 2 shows the scene 1 of mixed type SDN network and core net according to exemplary embodiment of the present invention.As shown in Figure 2, can connect two SDN network substations by core net (such as existing MPLS core net).For instance, single SDN-CE100 can control the SDN-FE101-104 in two SDN substations (SDN substation 1 and SDN substation 2 as shown in Figure 2).In core net, can dispose edge router (such as LER105 and LER107) and intermediate router (such as LSR106, LSR108 and LSR109).Fig. 3 shows the scene 2 of mixed type SDN network and core net according to exemplary embodiment of the present invention.With similar in Fig. 2, can connect two SDN network substations (SDN substation 1 and SDN substation 2 as shown in Figure 3) by core net (such as existing MPLS core net).But, be different from the scene shown in Fig. 2, in Fig. 3, sub level SDN-CE210 and sub level SDN-CE220 provide respectively function have been controlled in this locality of SDN substation 1 and SDN substation 2.Parent SDN CE200 provides the overall situation control function of whole SDN network.Fig. 4 shows the scene 3 of mixed type SDN network and core net according to exemplary embodiment of the present invention.In Fig. 4, can connect two independently SDN networks (SDN network 1 and SDN network 2 as shown in Figure 4) by core net (such as existing MPLS core net).SDN-CE310 and SDN-CE320 provide respectively the control function of SDN network 1 and SDN network 2.
In three kinds of possible mixed type SDN shown in Fig. 2-Fig. 4 and core net deployment scenario, all can implement the SDN flow forwarding scheme that exemplary embodiment of the present proposes.For instance, the LER105 in Fig. 2 and LER107 can distinguish the function of LER1 and LER2 in execution graph 1, and LSR106, LSR108 in Fig. 2 and LSR109 can execution graph 1 in the function of LSR.According to exemplary embodiment, at ingress edge router LER105 place, SDN can be flowed to the SDN stream entry map of (for example stream 1 in Fig. 2, stream 2 or stream 3) to its corresponding SDN stream label stack, and determine at least in part the LSP label stack of corresponding SDN stream based on SDN stream label stack.LER105 can be forwarded to corresponding LSR together with corresponding SDN stream label stack and LSP label stack by SDN flow point group.In response to receive SDN stream from LSR, egress edge router LER107 can eject SDN stream label stack, and based on SDN stream label stack, received SDN flow point group is delivered to SDN Delivery Function and the corresponding port that will go at least in part.For instance, for the stream 1 from SDN-FE101, LER105 can be forwarded to LSR106 together with corresponding SDN stream label stack and LSP label stack by SDN flow point group.Accordingly, for the SDN stream from LSR106, LER107 can eject SDN stream label stack, and received SDN flow point group is delivered to SDN-FE103.In another example, for the stream 3 from SDN-FE102, LER105 can be forwarded to LSR109 by SDN flow point group and SDN stream label stack thereof and LSP label stack.Correspondingly, LER107 can be delivered to SDN-FE104 by received SDN flow point group.
According to another exemplary embodiment, the LER107 in Fig. 2 can serve as ingress edge router and correspondingly realize the function of LER1 in Fig. 1, and LER105 can serve as egress edge router and correspondingly realize the function of LER2 in Fig. 1.In this case, LER107 can arrive SDN substation 1 through core net by the SDN flow forwarding from SDN substation 2.Similarly, according to network settings, the LER335 in LER235 and Fig. 4 in Fig. 3 can realize LER1(and/or LER2 in Fig. 1) function, and LER337 in LER237 and Fig. 4 in Fig. 3 can realize LER2(and/or LER1 in Fig. 1) function.In addition, LSR336, the LSR338 in the LSR236 in Fig. 3, LSR238 and LSR239 and Fig. 4 and LSR339 can realize the function of LSR in Fig. 1.Provide new improved label to generate strategy according to the scheme of exemplary embodiment, it has strengthened the label correlation function of LER, but do not need to change such as the such intermediate router of LSR, this has not only reduced development cost, and reduced the complexity of device fabrication, and greatly eliminate the impact that existing network is disposed.
Indicative flowchart below is generally set forth as logical flow chart.Therefore, the step of shown order and institute's mark represents an embodiment of proposed method.Can expect aspect function, logic OR effect, being equivalent to other step and method of one or more steps or its part of described method.In addition, the form adopting and symbol provide for the logic step of explaining the method, and are understood to not limit the scope of the method.Although can adopt various arrow types and the line style of type in flow chart, but they are understood to not limit the scope of corresponding method.In fact, some arrow or other connector may only be used to indicate the logic flow of the method.In addition, the order that ad hoc approach occurs can according to shown in the order of corresponding step, or, can not according to shown in the order of corresponding step.
Fig. 5 shows the flow chart of the method for forwarding SDN stream according to exemplary embodiment of the present invention.The method can be located to realize at the ingress edge router of MPLS core net (such as the LER1 in Fig. 1).In step 502, the stream of the SDN based on corresponding with SDN flow point group entry, can obtain the SDN stream label stack for this SDN flow point group at least in part.For instance, the ingress edge router of MPLS core net can be from SDN substation or network receive SDN flow point group.Divide into groups for SDN, SDN stream entry (for example can include but not limited to matching field, ethernet source/destination-address, IP source/destination way address, and transmission control protocol/User Datagram Protoco (UDP) (TCP/UDP) source/destination ground port) and the respective operations (such as the specified action of behavior aggregate) of SDN stream.In the exemplary embodiment, can locate to safeguard the mapping table between SDN stream entry and SDN stream label stack at the edge router of MPLS network (LER1 in such as Fig. 1).Table 1 below shows corresponding example.
Table 1: the mapping table between SDN stream entry and SDN stream label stack
In table 1, mark " FL " expression " stream label ", symbol " * " represents asterisk wildcard.For instance, the symbol " * " in the matching field of SDN stream entry can represent to mate any value; And symbol " * " in operation (such as the action) field of SDN stream entry can represent to implement any operation.According to the mapping relations (all contents as shown in table 1) between SDN stream entry and SDN stream label stack, can be by the SDN stream entry map of SDN flow point group to corresponding SDN stream label stack.
In step 504, can be that SDN flow point group is determined the LSP label stack corresponding with its SDN stream label stack.In the exemplary embodiment, can locate to safeguard the mapping table between SDN stream label stack and LSP label stack at the edge router of MPLS network (LER1 in such as Fig. 1).Table 2 below shows corresponding example.
Table 2: the mapping table between SDN stream label stack and LSP label stack
| SDN flows entry number | SDN stream label stack | LSP label stack |
| 1 | {FL200,FL100} | {LL100,LL300} |
| 2 | {FL200,FL120} | {LL200} |
| 3 | {FL300,FL210,FL100} | {LL100} |
| 4 | {FL400} | {LL220,LL210} |
| 5 | {FL500} | {LL400} |
| 6 | {FL600} | {LL500} |
| …… | …… | …… |
In table 2, mark " LL " expression " LSP label ".Utilize mapping relations between SDN stream label stack and LSP label stack (such as the content described in table 2), can obtain according to the SDN stream label stack of SDN flow point group the LSP label stack of this SDN flow point group.
In step 506, at least in part based on LSP label stack, can in MPLS core net, divide into groups by forwarding data, wherein this packet at least comprises LSP label stack, SDN stream label stack and SDN flow point group.For instance, in MPLS core net, forwarding at least in part this packet based on LSP label stack can comprise with lower at least one item: distinguish the forwarding to this packet according to the matching field collection in SDN stream entry; And distinguish the forwarding to this packet according to the behavior aggregate in SDN stream entry.In fact, because LSP label stack described herein is to determine according to the SDN stream label stack corresponding with SDN stream entry, thereby, not only can reflect the Different matching sets of fields of SDN stream entry according to the LSP label stack of exemplary embodiment, but also can reflect that SDN flows the different behavior aggregate of entry, thereby make LER to distinguish the SDN flow point group with different FEC according to LSP label stack, to each SDN flow point group is transmitted to corresponding LSR in MPLS core net via different LSP, and then is delivered to corresponding egress edge router.
According to exemplary embodiment, can indicate SDN stream label stack by reservation label, in the normality situation of forwarding of packets, do not use this reservation label.In this case, the packet of step 506 repeating in Fig. 5 may further include reservation label.For instance, reservation label can be specific to supplier and reserved label or the reserved label of Internet Assinged Numbers Authority (IANA).In one exemplary embodiment, can comprise LSP label stack and reservation label described above for the MPLS label stack of SDN flow point group.In this embodiment, at the bottom of reservation label can be positioned at the stack of MPLS label stack, and can indicate the SDN stream label stack of trailing this MPLS label stack.In a further exemplary embodiment, can comprise LSP label stack, reservation label and SDN stream label stack for the MPLS label stack of SDN flow point group.In this embodiment, at the bottom of reservation label can not be in the stack of MPLS label stack, and can indicate the SDN stream label stack of trailing after this reservation label.
Fig. 6 (a) has illustrated a kind of SDN stream label stack according to exemplary embodiment of the present invention.As shown in Figure 6 (a), can indicate SDN stream label stack by a reservation label of MPLS label stack bottom, at the bottom of corresponding stack, (BoS) bit is set to 1, and SDN stream label stack is trailed MPLS label stack.MPLS label stack also comprises LSP label stack, and wherein EXP represents test bit, and TTL represents bit life cycle.Fig. 6 (b) has illustrated another kind of SDN stream label stack according to exemplary embodiment of the present invention.As shown in Figure 6 (b), can indicate SDN stream label stack by a reservation label in MPLS label stack, but the not bottom in MPLS label stack of this reservation label.SDN stream label stack is trailed this reservation label and the part as MPLS label stack.For instance, can adopt as the reservation label of integer value and indicate SDN stream label stack, also can adopt reservation label and EXP bit to carry out joint instructions SDN stream label stack.In the exemplary embodiment, the SDN stream label 1 in Fig. 6 (a)-(b) and SDN stream label 2 can correspond respectively to SDN stream label FL100 and the FL200 in the 1st row of table 1; Correspondingly, the LSP label 1 in Fig. 6 (a)-(b) and LSP label 2 can correspond respectively to LSP label LL300 and the LL100 in the 1st row of table 2.
Fig. 7 shows the flow chart of the method for forwarding SDN stream according to another exemplary embodiment of the present invention.The method can be located to realize at the egress edge router of MPLS core net (such as the LER2 in Fig. 1).In step 702, in response to receive packet in MPLS core net, can obtain SDN stream label stack, wherein, this packet at least comprises SDN flow point group and LSP label stack and described SDN stream label stack for this SDN flow point group.For instance, the egress edge router of MPLS core net can receive this packet by the LSR from MPLS core net.In the situation that adopting reservation label to indicate SDN stream label stack, this packet may further include this reservation label.In one exemplary embodiment, comprise LSP label stack and reservation label for the MPLS label stack of SDN flow point group, wherein, at the bottom of reservation label can be positioned at the stack of MPLS label stack, be used to indicate the SDN stream label stack of trailing MPLS label stack.In a further exemplary embodiment, comprise LSP label stack, reservation label and SDN stream label stack for the MPLS label stack of SDN flow point group, wherein, this reservation label in MPLS label stack has been indicated the SDN stream label stack of trailing described reservation label.It should be noted that, it is the definite LSP label stack of this SDN flow point group at the ingress edge router place of MPLS core net that LSP label stack in this packet is different from according to the method shown in Fig. 5, and this is because the LSR in MPLS core net has carried out revising (as shown in the S803 in Fig. 8) to the LSP label stack of this SDN flow point group in the process that forwards grouping.In step 704, can forward SDN flow point group based on SDN stream label stack at least in part.For instance, the egress edge router of core net can correspondingly eject LSP label stack and SDN stream label stack for received packet, and according to SDN stream label stack, SDN flow point group is delivered to the forwarding of packets destination in SDN substation or network.
More than describe according to an exemplary embodiment of the present invention for forward the method for SDN stream in MPLS core net.It should be pointed out that described method is only example, instead of limitation of the present invention.That the method that forwards SDN stream for realizing in MPLS core net of the present invention can have is more, still less or different steps, more described steps can be merged into single step or be divided into thinner step, and order between some steps can change or can executed in parallel.
Fig. 8 shows the process of tunnel transmission SDN flow point group in existing MPLS core net according to exemplary embodiment of the present invention.As shown in Figure 8, SDN-FE1 may expect by SDN flow point group 1(its can be relevant to specific SDN stream entry) send to SDN-FE2 via core net.At S801, as the ingress edge router of SDN flow point group 1, LER1 can search its mapping table about SDN stream entry and SDN stream label stack having, and fetches the corresponding SDN stream label of this SDN flow point group stack (SDN stream label stack 1 as shown in Figure 8).At S802, according to the mapping table between SDN stream label stack and LSP label stack, LER1 can obtain the LSP label stack (LSP label stack 1 as shown in Figure 8) of SDN flow point group.In the exemplary embodiment, LER1 can fit together LSP label stack 1, reservation label (as the instruction of SDN stream label), SDN stream label stack 1 and SDN flow point group 1, for example become { LSP label stack 1, reservation label (instruction of SDN stream label), SDN stream label stack 1, SDN flow point group 1}, then forwards it according to LSP label stack 1.At S803, LSR can receive from LER1 { LSP label stack 1, reservation label (instruction of SDN stream label), SDN stream label stack 1, SDN flow point group 1}.For instance, LSR can implement forwarding of packets based on LSP label stack 1, and LSP label stack 1 is modified as to LSP label stack 2.Correspondingly, LSR can by LSP label stack 2, reservation label (instruction of SDN stream label), SDN stream label stack 1, SDN flow point group 1} sends to LER2.At S804, LER2 can receive from LSR { LSP label stack 2, reservation label (instruction of SDN-stream label), SDN stream label stack 1, SDN flow point group 1}.For instance, LER2 can eject LSP label stack 2, reservation label (instruction of SDN stream label) and SDN stream label stack 1, then can based on SDN stream label stack 1, SDN flow point group 1 be sent to SDN-FE2 at least in part.
According to exemplary embodiment of the present invention, the labeled packet forwarding scheme of existing MPLS core net edge router is revised, thereby can in existing MPLS core net, be distinguished SDN stream.The SDN stream that the described scheme of exemplary embodiment of the present not only can be distinguished in MPLS core net according to different SDN stream matching field collection is sent, but also the SDN stream that can distinguish in MPLS core net according to different SDN stream behavior aggregate is sent.The solution proposing at this can be applicable to the different deployment scenario (scene shown in Fig. 2-Fig. 4) of SDN and MPLS heterogeneous network.In the time of the solution that adopts exemplary embodiment to describe, only need to revise edge router, and do not need to revise intermediate router.In addition can also be applied to, the traffic engineering of SDN stream according to the SDN stream label stack of exemplary embodiment.
Fig. 9 shows the schematic diagram of the equipment for forward SDN stream in MPLS core net according to exemplary embodiment of the present invention.It should be noted that Fig. 9 only schematically shows the first equipment 910 and the second equipment 920 and the main modular thereof that participate in SDN flow forwarding.It should be pointed out that described the first equipment 910 and the second equipment 920 are only example, instead of limitation of the present invention.The first equipment 910 and the second equipment 920 can have more, still less or different functional modules than described according to an exemplary embodiment of the present invention, more described functional modules can combine, or Further Division, or thering is different annexations and inclusion relation, all these change all within the spirit and scope of the present invention.
As shown in Figure 9, the entrance LER of the first equipment 910(such as MPLS core net) can comprise acquisition module 912, determination module 914 and forwarding module 916.In the exemplary embodiment, acquisition module 912 can be configured to the stream of the SDN based on corresponding with SDN flow point group entry at least in part, obtains the SDN stream label stack for this SDN flow point group.Determination module 914 can be configured to determine the LSP label stack corresponding with this SDN stream label stack into SDN flow point group.Forwarding module 916 can be configured at least in part based on LSP label stack, forwarding data grouping in MPLS core net, and wherein, this packet at least comprises LSP label stack, SDN stream label stack and SDN flow point group.The outlet LER of the second equipment 920(such as MPLS core net) can comprise acquisition module 922 and forwarding module 924, as shown in Figure 9.According to exemplary embodiment, acquisition module 922 can be configured in response to receive packet in MPLS core net, obtain SDN stream label stack, wherein, this packet at least comprises SDN flow point group and LSP label stack and SDN stream label stack for this SDN flow point group.Forwarding module 924 can be configured to forward SDN flow point group based on SDN stream label stack at least in part.In the exemplary embodiment, can adopt as indicated SDN stream label stack in conjunction with the described reservation label of Fig. 5-Fig. 8 (such as the reservation label in MPLS label stack).For instance, this SDN stream label stack can be trailed MPLS label stack or the part as MPLS label stack.
Should be appreciated that the structured flowchart described in Fig. 9 illustrates just to the object of example, instead of limitation of the scope of the invention.In some cases, can increase or reduce as the case may be certain module, device or equipment.Flow chart in accompanying drawing and block diagram, illustrate architectural framework in the cards, function and operation according to the method for various embodiments of the invention, device and computer program.In this, the each square frame in flow chart or block diagram can represent a part for module, program segment or a code, and a part for described module, program segment or code comprises one or more for realizing the executable instruction of logic function of regulation.Also it should be noted that what the function marking in square frame also can be marked to be different from accompanying drawing occurs in sequence in some realization as an alternative.For example, in fact the square frame that two adjoining lands represent can be carried out substantially concurrently, and they also can be carried out by contrary order sometimes, and this determines according to related function.
Can realize the present invention by the mode of hardware, software, firmware or its combination.Any computer system or other device that are suitable for realizing the method described in literary composition are all suitable.A kind of combination of typical hardware and software can be the general-purpose computing system that contains computer program, in the time that this computer program is loaded and carries out, it is controlled this computer system and makes its step of carrying out the method described in literary composition, or forms the functional module in devices in accordance with embodiments of the present invention and system.The present invention can also be embodied in computer program, this computer program contains all features that make it possible to realize the method described in literary composition, and in the time that it is loaded in computer system, can carry out these methods, or form the functional module in devices in accordance with embodiments of the present invention and system.
Although disclose specific embodiments of the invention, but will be understood by those skilled in the art that in the situation that not deviating from the spirit and scope of the present invention and can change specific embodiment.Therefore, scope of the present invention is not limited to specific embodiment, and it is intended to claims and contains any and all such application, amendment and the embodiment in the scope of the invention.
Claims (15)
1. for a method for reflecting software define grid stream, described method comprises:
Software defined network based on corresponding with software defined network flow point group stream entry, obtains the software defined network stream label stack for described software defined network flow point group at least in part;
For described software defined network flow point group is determined the label switched path label stack corresponding with described software defined network stream label stack; And
At least in part based on described label switched path label stack, forwarding data grouping in multiprotocol label switching core net, wherein, described packet at least comprises described label switched path label stack, described software defined network stream label stack and described software defined network flow point group.
2. according to the method for claim 1, wherein, multi-protocol label switching (T-MPLS) label stack for described software defined network flow point group comprises described label switched path label stack and reservation label, and wherein, the described reservation label at the bottom of the stack of described multi-protocol label switching (T-MPLS) label stack has been indicated the described software defined network stream label stack of trailing described multi-protocol label switching (T-MPLS) label stack.
3. according to the method for claim 1, wherein, multi-protocol label switching (T-MPLS) label stack for described software defined network flow point group comprises described label switched path label stack, reservation label and described software defined network stream label stack, and wherein, the described reservation label in described multi-protocol label switching (T-MPLS) label stack has been indicated the described software defined network stream label stack of trailing described reservation label.
4. according to the method described in any one in claim 1-3, wherein, in described multiprotocol label switching core net, forward at least in part described packet based on described label switched path label stack and comprise with lower at least one:
Distinguish the forwarding to described packet according to the matching field collection in described software defined network stream entry; And
Distinguish the forwarding to described packet according to the behavior aggregate in described software defined network stream entry.
5. for an equipment for reflecting software define grid stream, described equipment comprises:
Acquisition module, it is configured to the stream of the software defined network based on corresponding with software defined network flow point group entry at least in part, obtains the software defined network stream label stack for described software defined network flow point group;
Determination module, it is configured to determine the label switched path label stack corresponding with described software defined network stream label stack into described software defined network flow point group; And
Forwarding module, it is configured at least in part based on described label switched path label stack, forwarding data grouping in multiprotocol label switching core net, wherein, described packet at least comprises described label switched path label stack, described software defined network stream label stack and described software defined network flow point group.
6. according to the equipment of claim 5, wherein, multi-protocol label switching (T-MPLS) label stack for described software defined network flow point group comprises described label switched path label stack and reservation label, and wherein, the described reservation label at the bottom of the stack of described multi-protocol label switching (T-MPLS) label stack has been indicated the described software defined network stream label stack of trailing described multi-protocol label switching (T-MPLS) label stack.
7. according to the equipment of claim 5, wherein, multi-protocol label switching (T-MPLS) label stack for described software defined network flow point group comprises described label switched path label stack, reservation label and described software defined network stream label stack, and wherein, the described reservation label in described multi-protocol label switching (T-MPLS) label stack has been indicated the described software defined network stream label stack of trailing described reservation label.
8. according to the equipment described in any one in claim 5-7, wherein, in described multiprotocol label switching core net, forward at least in part described packet based on described label switched path label stack and comprise with lower at least one:
Distinguish the forwarding to described packet according to the matching field collection in described software defined network stream entry; And
Distinguish the forwarding to described packet according to the behavior aggregate in described software defined network stream entry.
9. according to the equipment described in any one in claim 5-7, wherein, described equipment comprises the entrance tag edge router of described multiprotocol label switching core net.
10. for a method for reflecting software define grid stream, described method comprises:
In response to receive packet in multiprotocol label switching core net, obtain software defined network stream label stack, wherein, described packet at least comprises software defined network flow point group and label switched path label stack and described software defined network stream label stack for described software defined network flow point group; And
Forward described software defined network flow point group based on described software defined network stream label stack at least in part.
11. according to the method for claim 10, wherein, multi-protocol label switching (T-MPLS) label stack for described software defined network flow point group comprises described label switched path label stack and reservation label, and wherein, the described reservation label at the bottom of the stack of described multi-protocol label switching (T-MPLS) label stack has been indicated the described software defined network stream label stack of trailing described multi-protocol label switching (T-MPLS) label stack.
12. according to the method for claim 10, wherein, multi-protocol label switching (T-MPLS) label stack for described software defined network flow point group comprises described label switched path label stack, reservation label and described software defined network stream label stack, and wherein, the described reservation label in described multi-protocol label switching (T-MPLS) label stack has been indicated the described software defined network stream label stack of trailing described reservation label.
13. 1 kinds of equipment for reflecting software define grid stream, described equipment comprises:
Acquisition module, it is configured in response to receive packet in multiprotocol label switching core net, obtain software defined network stream label stack, wherein, described packet at least comprises software defined network flow point group and label switched path label stack and described software defined network stream label stack for described software defined network flow point group; And
Forwarding module, it is configured to forward described software defined network flow point group based on described software defined network stream label stack at least in part.
14. according to the equipment of claim 13, wherein, multi-protocol label switching (T-MPLS) label stack for described software defined network flow point group comprises described label switched path label stack and reservation label, and wherein, the described reservation label at the bottom of the stack of described multi-protocol label switching (T-MPLS) label stack has been indicated the described software defined network stream label stack of trailing described multi-protocol label switching (T-MPLS) label stack.
15. according to the equipment of claim 13, wherein, multi-protocol label switching (T-MPLS) label stack for described software defined network flow point group comprises described label switched path label stack, reservation label and described software defined network stream label stack, and wherein, the described reservation label in described multi-protocol label switching (T-MPLS) label stack has been indicated the described software defined network stream label stack of trailing described reservation label.
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