CN102546433A - Data forwarding method based on MPLS (Multi Protocol Label Switching) VPN (Virtual Private Network) and PEs (Provider Edges) - Google Patents
Data forwarding method based on MPLS (Multi Protocol Label Switching) VPN (Virtual Private Network) and PEs (Provider Edges) Download PDFInfo
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Abstract
The invention provides a data forwarding method based on an MPLS (Multi Protocol Label Switching) VPN (Virtual Private Network) and PEs (Provider Edges), wherein the method comprises the following steps of: establishing an MPLS LSP (Label Switched Path) among communicated PEs; configuring an incoming label value of the VPN connected with the communicated PEs and an outgoing label value of the VPN connected with the opposite-end PE, wherein the outgoing label value is same as an incoming label value configured on the opposite-end PE; taking the outgoing label value as an inner-layer outgoing label value of a data message which is sent from the PE to the opposite-end PE; forwarding the data message configured with a label well by the LSP; and determining the destination VPN of the received data message by recognizing the inner-layer outgoing label value of the received data message of the PE and the incoming label value configured on the PE. According to the data forwarding method, the process needing labels for forwarding data messages between the PE and the opposite-end PE is simplified.
Description
Technical field
The present invention relates to MPLS VPN network, relate in particular to a kind of data forwarding method and edge device based on MPLS VPN.
Background technology
(Virtual Private Network VPN), is the private dedicated network that utilizes common network to make up to Virtual Private Network, and it has won application more and more widely with its advantage that shows unique characteristics.For the user, use VPN can reduce expense, convenient management; For operator, use VPN can utilize existing infrastructure to provide value added service, enlarge the operation traffic carrying capacity and also created new commercial opportunity simultaneously.
(Multi-Protocol Label Switching is that a kind of grouping that will have identical forwarding processing mode is classified as the classification transmission technology of a type (being forwarding equivalence class, Forwarding EquivalentClass) MPLS) to Multiprotocol Label Switching Protocol.MPLS is used for improving the forwarding speed of router and an agreement proposing, but because MPLS makes MPLS become the major criterion of expansion IP network scale day by day in these two of traffic engineering and the VPN superior performance in the very crucial technology in IP network at present.The key of mpls protocol is to have introduced label (Label) switching concept; In the MPLS network; The content of MPLS edge router analyzing IP bag also was that these IP bags are selected suitable labels when IP wrapped in first MPLS equipment of entering, just as transmitting foundation IP was wrapped in the MPLS transmission through network according to this label later on; Label is separated by edge router when the IP bag leaves the MPLS network.In the MPLS network, the network equipment is divided into edge network equipment and core network device.Edge network equipment provides traffic classification and label mapping, the function that label removes.Core network device provides label exchange and label distribution function.
MPLS VPN network, MPLS be as a kind of technology platform of IP backbone efficiently, provides flexibly a kind of and had the technical foundation of extensibility for realizing VPN.MPLS VPN network is made up of three kinds of network equipments:
(1) edge customer CE (Custom Edge), the edge device that directly links to each other in the user network with the service provider;
(2) edge device PE (Provider Edge), the edge device in the backbone network, it directly links to each other with CE;
(3) P router (Provider Router), the equipment that does not directly link to each other with CE in the backbone network.
Fig. 1 is a MPLS VPN network architecture model.MPLS VPN network is made up of the backbone network of operator and each website (Site) of user, and each site links to each other with PE through CE, and site constitutes the elementary cell of VPN.VPN is exactly the division to the site set, the corresponding set of forming by some site of VPN, and a site also can belong to different VPN simultaneously.There is not the VPN of common site can use overlapping address space for any two; Promptly in user's private network, use own independent address space; And whether need not consider the address space conflicts with other VPN or public network; This just need depend on "VPN routing and forwarding (VRF) instance (VPN Routing & Forwarding Instance, VRF).VRF only is present on the PE, and is as shown in Figure 2, on PE, all creates a corresponding with it VRF to each VPN, and each VRF comprises a routing table, transmits one group of set of interfaces and one group of relevant with it strategy that uses this VRF for one.VRF can be counted as a virtual router.The detailed description of relevant MPLS VPN is seen RFC 2547.
In MPLS VPN network, all processing of VPN are all occurred on the pe router, for this reason, reinstated VPNv4 address family on the pe router, introduced routing tag RD attributes such as (Route Distinguisher).RD has overall uniqueness, and through with the RD of the 8byte expansion as the IPv4 address prefix, making not unique IPv4 address spaces is unique VPNv4 address.Need the route of issue based on VPNv4 address family between the PE peer-to-peer, this normally realizes through BGP.The VPNv4 routing procedure of the last formation of PE BGP is roughly following: after PE receives the IPv4 route from CE, the IPv4 route is belonged to the expansion of the RD of VRF as the IPv4 address prefix, the IPv4 route is converted into the VPNv4 route; PE goes into label L1 for the VPNv4 route assignment; PE organizes the Route-target attribute of VPNv4 route according to route target (Route-target) configuration of IPv4 route place VRF; Next jumping that PE is provided with the VPNv4 route is oneself, and organizes other attributes of VPNv4 route, and so far, the VPNv4 route forms.PE is sent to opposite end PE with the VPNv4 route that forms, and opposite end PE parses corresponding IPv4 route and label L1 from the VPNv4 route that receives, and confirms the purpose VRF of IPv4 route according to the Route-target attribute of VPNv4 route; Opposite end PE receives the internal layer outgoing label value of message with label L1 as self; According to the next hop information of the VPNv4 route that receives, inquiry needs the body of use to receive the outer outgoing label value of message in the MPLS label switched path LSP that the PE with this VPNv4 route of transmission sets up; With the above information that obtains (as, route prefix, mask) internal layer outgoing label and outer outgoing label) be issued to and transmit.Fig. 3 has provided above-mentioned PE and has used bgp protocol to carry out the sketch map of issue of VPN route and study according to the mode of RFC2547.
After accomplishing issue of VPN route and study between the PE peer-to-peer, and this peer-to-peer is set up between the CE of syntople and can be given out a contract for a project mutually.The VPN message is transmitted sketch map at MPLS VPN in the prior art as shown in Figure 4.Among the figure, set up MPLS label switched path LSP between PE1 and the PE2.CE1 is to the CE2 literary composition that sends datagram, and this data message arrives CE2 through PE1-P router-PE2.The process of PE1 deal with data message is: PE1 obtains ID number of VPN1 according to the VRF attribute of data message incoming interface; PE1 uses VPN1 ID and data message purpose IP address search VRF, obtains outgoing interface, internal layer outgoing label value 17 (PE2 that PE1 obtains through study goes up the label of going into that distributes) and outer outgoing label value 23 (next jumps label); PE1 is encapsulated into internal layer outgoing label value 17 and outer outgoing label value 23 in the message; PE1 forwards packaged message from outgoing interface.The process of P router deal with data message is: judge whether the data message from PE1 is the label bag, confirm be the label bag situation under, take out the ground floor MPLS forwarding label (outer outgoing label) of this data message; Label value 23 according to ground floor MPLS forwarding label is searched Label Forwarding Information Base, obtains outgoing interface, next jumping and outgoing label value; Whether be 3, if the outgoing label value is not 3, explain that next jumping is not the end-node of LSP if judging label value, remove the ground floor MPLS forwarding label of this data message, encapsulates new outer layer label; If the outgoing label value is 3, explain that next jumping is the end-node of LSP, go out according to inferior last ricochet and directly transmit through outgoing interface after rule is removed the ground floor MPLS forwarding label of this data message.The process of PE2 deal with data message is: judge whether the data message from the P route is the label bag, is confirming it is under the situation of label bag, takes out the ground floor MPLS forwarding label (internal layer outgoing label) of this data message; Judge whether the quadratic search mark is arranged on the forwarding entry; If the quadratic search mark is arranged; Confirm to obtain purpose VPN according to ground floor MPLS forwarding label value 17; Destination address according to data message carries out matched routings in the VRF corresponding with said purpose VPN, obtain to be used to transmit the outgoing interface that receives message; If there is not the quadratic search mark, directly searches the routing table that the VRF corresponding with said purpose VPN comprise according to ground floor MPLS forwarding label value 17 and obtain transmitting the outgoing interface that receives message; PE2 will receive and forward from the outgoing interface that finds after message is peeled off ground floor MPLS forwarding label.
Visible from said process, in existing MPLS VPN network, to transmit the required labeling requirement PE of data message and obtain according to bgp protocol study, acquisition process is complicated.
Summary of the invention
The invention provides a kind of data forwarding method and edge device based on MPLS VPN, need be with the forwarding data message of avoiding prior art to exist through the technical problem of loaded down with trivial details route issuing process study forwarding label.
For solving this technical problem, the invention provides a kind of data forwarding method based on Multi-Protocol Label Switch (MPLS) Virtual Private Network (VPN), said method comprises:
Between the edge device (PE) of intercommunication, set up MPLS label switched path (LSP);
The outgoing label value of going into label value and going to the VPN that is connected with opposite end PE of the connected VPN of configuration on the PE of said intercommunication, said outgoing label value with on the PE of opposite end, dispose to go into label value identical;
Said outgoing label value is mail to the internal layer outgoing label value of the data message of opposite end PE as PE;
Transmit the data message that configures label through said LSP;
Internal layer outgoing label value and PE through identification PE receiving data packets go up the label value of going into that disposes, and confirm the purpose VPN of this receiving data packets.
Further, a plurality of during when existing with VPN that the PE of said intercommunication is connected, on the PE of said intercommunication, dispose one by one into label value for connected said a plurality of VPN; It is identical that the outgoing label value of the VPN that connects at going to of disposing on the PE of said intercommunication and opposite end PE and at least one that on the PE of opposite end, disposes are gone into label value.
Further; Said method also comprises: after confirming the purpose VPN of receiving data packets; Destination address according to this receiving data packets carries out matched routings in the "VPN routing and forwarding (VRF) instance corresponding with said purpose VPN (VRF), obtain to be used to transmit the outgoing interface that receives message.
For solving the problems of the technologies described above; The invention provides a kind of edge device (PE) of transmitting data based on Multi-Protocol Label Switch (MPLS) Virtual Private Network (VPN); Said PE comprises that MPLS label switched path (LSP) sets up module, configuration module, label module, data message forwarding module and purpose VPN identification module are set, wherein:
LSP sets up module, is used to set up the LSP between PE and its intercommunication PE;
Configuration module is used on PE the outgoing label value of going into label value and going to the VPN that is connected with its opposite end PE of the connected VPN of configuration, dispose on said outgoing label value and its opposite end PE to go into label value identical;
Label is provided with module, is used for said outgoing label value is mail to as PE the internal layer outgoing label value of the data message of opposite end PE;
The data message forwarding module is used for sending the data message that configures label through said LSP;
Purpose VPN identification module is used for going up the label value of going into that disposes through the internal layer outgoing label value and the PE of identification PE receiving data packets, confirms the purpose VPN of this receiving data packets.
Further, said configuration module is used for when existing a plurality ofly during with VPN that PE is connected, on PE, disposes one by one into label value for connected said a plurality of VPN; It is identical that the outgoing label value of the VPN that connects at going to of disposing on the PE and its opposite end PE and at least one that on the PE of opposite end, disposes are gone into label value.
Further; Said edge device also comprises the quadratic search module; After being used for confirming the purpose VPN of receiving data packets; Destination address according to this receiving data packets carries out matched routings in the "VPN routing and forwarding (VRF) instance corresponding with said purpose VPN (VRF), obtain to be used to transmit the outgoing interface that receives message.
Go into label value and outgoing label value between the PE that technique scheme intercoms through static configuration mutually, greatly simplified the flow process of transmitting the required label of data message between PE and the opposite end PE.
Description of drawings
Fig. 1 is a MPLS VPN network architecture model;
Fig. 2 is the VRF that exists among the PE and the graph of a relation between each VPN;
Fig. 3 uses bgp protocol to carry out the sketch map of issue of VPN route and study for PE according to the mode of RFC2547;
Fig. 4 is that the VPN message is transmitted sketch map at MPLS VPN in the prior art;
Fig. 5 is the data message forwarding method flow chart based on MPLS VPN of present embodiment;
Fig. 6 is for using the sketch map of example static configuration MPLS VPN;
Fig. 7 transmits sketch map for the VPN message that should use example at MPLS VPN;
Fig. 8 is that the edge device based on the forwarding data of MPLS VPN of present embodiment is formed module map.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.
Fig. 5 realizes VPN data communications method flow chart based on MPLS.
S501 sets up MPLS label switched path (LSP) between the edge device (PE) of intercommunication;
S502 disposes the outgoing label value of going into label value and going to the VPN that is connected with opposite end PE of connected VPN on the PE of said intercommunication, said outgoing label value with on the PE of opposite end, dispose to go into label value identical;
The label value of going into that on the PE of said intercommunication, disposes is one or more; A plurality of during when existing with VPN that the PE of said intercommunication is connected, on the PE of said intercommunication, dispose one by one into label value for connected said a plurality of VPN; It is identical that the outgoing label value of the VPN that connects at going to of disposing on the PE of said intercommunication and opposite end PE and at least one that on the PE of opposite end, disposes are gone into label value;
S503 mails to said outgoing label value the internal layer outgoing label value of the data message of opposite end PE as PE;
S504 sends the data message that configures label through said LSP;
S505 goes up the label value of going into that disposes through the internal layer outgoing label value and the PE of identification PE receiving data packets, confirms the purpose VPN of this receiving data packets;
After confirming the purpose VPN of receiving data packets, in the "VPN routing and forwarding (VRF) instance corresponding (VRF), carry out matched routings, obtain and be used to transmit the outgoing interface that receives message with said purpose VPN according to the destination address of this receiving data packets.
Through concrete applying examples the foregoing description is done further to set forth below.
Fig. 6 is for using the sketch map of example static configuration MPLS VPN.
Should comprise five routers with example, wherein 2 as private virtual network edge user CE, and two as edge device PE, and one as the P router, and networking is as shown in Figure 6.Here only provide an example, set up a MPLS VPN network the most basic.
The concrete configuration process comprises the steps:
The 1st step: opening M PLS between PE1 and PE2, set up the MPLS label switched path LSP between PE1 and the PE2, normal with the outer layer tunnel that guarantees MPLS VPN;
The 2nd step: on PE1 and PE2, be respectively CE1 and CE2 and create VRF1, the VRF1 of establishment is all corresponding with VPN1;
The 3rd step: at CE1, the last configuration of CE2 arrives the route of opposite end, and next of route jumped and pointed to and the PE equipment that links to each other separately; Be that the Ip route XXX2 XXXX2 PE1-address on the CE1 partly disposes among Fig. 6, and the Ip route XXX1 XXXX1 PE2-address on the CE2 partly dispose;
The 4th the step: on PE1 and PE2, dispose the label value of going into of VRF1 respectively, among the VRF1 on the PE1 promptly shown in Figure 6 In-label:L1 partly dispose and PE2 on VRF1 in In-label:L2 partly dispose;
The 5th step: the outgoing label value that opposite end PE uses is gone in configuration respectively on PE1 and PE2; This outgoing label value need with on the PE of opposite end, dispose to go into label value identical; Among the VRF1 on the PE1 shown in the figure 6 next-hop:PE2 out-label:L2 partly dispose and PE2 on VRF1 in next-hop:PE1 out-label:L1 partly dispose;
The 6th step: assignment configuration is gone to the static routing of opposite end VPN among the VRF1 on PE1 and PE2; Be the configuration of Ip route vrf VRF1 XXX2 XXXX2 PE2-addressglobal part among the VRF1 on the PE1 shown in Figure 6, and Ip route Vrf VRF1 XXX1 XXXX1PE1-address global configuration partly among the VRF1 on the PE2;
The 7th step: configuration is accomplished.
After should using example static configuration MPLS VPN, two ends CE sends out the VPN data message mutually, and flow can intercommunication.
Fig. 7 transmits sketch map for the VPN message that should use example at MPLS VPN.
Among the figure, set up MPLS label switched path LSP between PE1 and the PE2.CE1 is to the CE2 literary composition that sends datagram, and this data message arrives CE2 through PE1-P router-PE2.
The process of PE1 deal with data message is: PE1 obtains ID number of VPN1 according to the VRF attribute of data message incoming interface; PE1 uses VPN1 ID and data message purpose IP address search VRF, obtains outgoing interface, internal layer outgoing label value 17 (also being the label value of going in the PE2 setting) and outer outgoing label value 23 (next jumps label value); PE1 is encapsulated into internal layer outgoing label value 17 and outer outgoing label value 23 in the message; PE1 forwards packaged message from outgoing interface.
The process of P router deal with data message is: judge whether the data message from PE1 is the label bag, confirm be the label bag situation under, take out the ground floor MPLS forwarding label (outer outgoing label) of this data message; Label value 23 according to ground floor MPLS forwarding label is searched Label Forwarding Information Base, obtains outgoing interface, next jumping and outgoing label value; Whether be 3, if the outgoing label value is not 3, explain that next jumping is not the end-node of LSP if judging label value, remove the ground floor MPLS forwarding label of this data message, encapsulates new outer outgoing label; If the outgoing label value is 3, explain that next jumping is the end-node of LSP, go out according to inferior last ricochet and directly transmit through outgoing interface after rule is removed the ground floor MPLS forwarding label of this data message.Should use in the example, the outgoing label value is 3, and the P router is gone out data message forwarding from outgoing interface after removing the outer outgoing label value 23 of data message.
The process of PE2 deal with data message is: judge whether the data message from the P route is the label bag; Confirming it is under the situation of label bag; Take out the ground floor MPLS forwarding label (internal layer outgoing label) of this data message; Carry out quadratic search according to this ground floor MPLS forwarding label; Promptly confirm the purpose VPN of receiving data packets, in the VRF corresponding, carry out matched routings, obtain and be used to transmit the outgoing interface that receives message with said purpose VPN according to the destination address of data message according to this ground floor MPLS forwarding label; PE2 will receive and forward from the outgoing interface that finds after message is peeled off ground floor MPLS forwarding label.
Fig. 8 is that the edge device based on the forwarding data of MPLS VPN of present embodiment is formed module map.
Said edge device PE comprises that MPLS label switched path (LSP) sets up module, configuration module, label module, data message forwarding module and purpose VPN identification module are set, wherein:
LSP sets up module, is used to set up the LSP between PE and its intercommunication PE;
Configuration module is used on PE the outgoing label value of going into label value and going to the VPN that is connected with its opposite end PE of the connected VPN of configuration, dispose on said outgoing label value and its opposite end PE to go into label value identical;
Configuration module is used on PE, disposing one or more and goes into label value; A plurality of during when existing with VPN that PE is connected, on PE, dispose one by one into label value for connected said a plurality of VPN; It is identical that the outgoing label value of the VPN that connects at going to of disposing on the PE and its opposite end PE and at least one that on the PE of opposite end, disposes are gone into label value;
Label is provided with module, is used for said outgoing label value is mail to as PE the internal layer outgoing label value of the data message of opposite end PE;
The data message forwarding module is used for sending the data message that configures label through said LSP;
Purpose VPN identification module is used for going up the label value of going into that disposes through the internal layer outgoing label value and the PE of identification PE receiving data packets, confirms the purpose VPN of this receiving data packets.
Said edge device also comprises the quadratic search module; After being used for confirming the purpose VPN of receiving data packets; Destination address according to this receiving data packets carries out matched routings in the "VPN routing and forwarding (VRF) instance corresponding with said purpose VPN (VRF), obtain to be used to transmit the outgoing interface that receives message.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize, correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Need to prove; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (6)
1. the data forwarding method based on Multi-Protocol Label Switch (MPLS) Virtual Private Network (VPN) is characterized in that, said method comprises:
Between the edge device (PE) of intercommunication, set up MPLS label switched path (LSP);
The outgoing label value of going into label value and going to the VPN that is connected with opposite end PE of the connected VPN of configuration on the PE of said intercommunication, said outgoing label value with on the PE of opposite end, dispose to go into label value identical;
Said outgoing label value is mail to the internal layer outgoing label value of the data message of opposite end PE as PE;
Transmit the data message that configures label through said LSP;
Internal layer outgoing label value and PE through identification PE receiving data packets go up the label value of going into that disposes, and confirm the purpose VPN of this receiving data packets.
2. the method for claim 1 is characterized in that:
A plurality of during when existing with VPN that the PE of said intercommunication is connected, on the PE of said intercommunication, dispose one by one into label value for connected said a plurality of VPN;
It is identical that the outgoing label value of the VPN that connects at going to of disposing on the PE of said intercommunication and opposite end PE and at least one that on the PE of opposite end, disposes are gone into label value.
3. according to claim 1 or claim 2 method is characterized in that said method also comprises:
After confirming the purpose VPN of receiving data packets, in the "VPN routing and forwarding (VRF) instance corresponding (VRF), carry out matched routings, obtain and be used to transmit the outgoing interface that receives message with said purpose VPN according to the destination address of this receiving data packets.
4. edge device (PE) of transmitting data based on Multi-Protocol Label Switch (MPLS) Virtual Private Network (VPN); It is characterized in that; Said PE comprises that MPLS label switched path (LSP) sets up module, configuration module, label module, data message forwarding module and purpose VPN identification module are set, wherein:
LSP sets up module, is used to set up the LSP between PE and its intercommunication PE;
Configuration module is used on PE the outgoing label value of going into label value and going to the VPN that is connected with its opposite end PE of the connected VPN of configuration, dispose on said outgoing label value and its opposite end PE to go into label value identical;
Label is provided with module, is used for said outgoing label value is mail to as PE the internal layer outgoing label value of the data message of opposite end PE;
The data message forwarding module is used for sending the data message that configures label through said LSP;
Purpose VPN identification module is used for going up the label value of going into that disposes through the internal layer outgoing label value and the PE of identification PE receiving data packets, confirms the purpose VPN of this receiving data packets.
5. edge device as claimed in claim 4 is characterized in that,
Configuration module is used for when existing a plurality ofly during with VPN that PE is connected, on PE, disposes one by one into label value for connected said a plurality of VPN; It is identical that the outgoing label value of the VPN that connects at going to of disposing on the PE and its opposite end PE and at least one that on the PE of opposite end, disposes are gone into label value.
6. like claim 4 or 5 described edge devices, it is characterized in that said edge device also comprises the quadratic search module,
Said quadratic search module; After being used for confirming the purpose VPN of receiving data packets; Destination address according to this receiving data packets carries out matched routings in the "VPN routing and forwarding (VRF) instance corresponding with said purpose VPN (VRF), obtain to be used to transmit the outgoing interface that receives message.
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| CN109218258A (en) * | 2017-06-30 | 2019-01-15 | 华为技术有限公司 | Data pack transmission method and gateway |
| CN109218258B (en) * | 2017-06-30 | 2021-01-05 | 华为技术有限公司 | Data packet transmission method and gateway equipment |
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