CN104717119A - Method and system for realizing bridge connection between L2 VPN and L3 VPN - Google Patents
Method and system for realizing bridge connection between L2 VPN and L3 VPN Download PDFInfo
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Abstract
The invention discloses a method and a system for realizing bridge connection between L2 VPN and L3 VPN and relates to the technical field of communication. The method for realizing the bridge connection between the L2 VPN and the L3 VPN comprises the following steps: respectively defining a first loopback interface and a second loopback interface; if service flow direction is from the L2 VPN to the L3 VPN, creating a unidirectional two-layer service from a two-layer interface to the first loopback interface, and converting the service into a frame format of the loopback interface from a frame format of an MPLS frame format; and creating a unidirectional three-layer service from the first loopback interface to a three-layer interface and converting the service into an IP frame format from the frame format of the loopback interface; if the service flow direction is from the L3 VPN to the L2 VPN, creating a unidirectional three-layer service from the three-layer interface to the second loopback interface, and converting the service into the frame format of the loopback interface from the IP frame format; and creating a unidirectional two-layer service from the second loopback interface to the two-layer interface, and converting the frame format of the loopback interface into the MPLS frame format. The method and the system for realizing bridge connection between the L2 VPN and the L3 VPN has the advantages that a large number of port resources are saved and working efficiency is improved.
Description
Technical field
The present invention relates to communication technical field, is specifically a kind of method and system realizing L2 VPN and L3 VPN bridge joint.
Background technology
For PTN (Packet Transport Network conventional in engineering, Packet Transport Network) networking, realize L3 VPN (Layer 3 Virtual Private Network, Layer3 Virtual Private Network) do not need just to support from Access Layer, generally only support L2VPN (Layer 2 Virtual Private Network at cut-in convergent layer, Layer 2 virtual private network), at core layer network support L3VPN, this is the concept of L2/L3 VPN bridge joint.The technical requirement to load bearing equipment can be reduced like this, reduce the impact of the change on existing cut-in convergent layer equipment and business, therefore require that core node supports inner termination L2VPN, be then bridged to L3VPN, realize the forwarding between L2VPN and L3VPN.
Shown in Figure 1, traditional PTN networking comprises UNI (the User-Network Interface being positioned at L2 VPN side, user network side interface) and be positioned at NNI (the Network-Network Interface of L3 VPN side, Network Side Interface), wherein, UNI is connected with NNI by bridge node.
Shown in Figure 2, two layer services are MPLS (Multi-Protocol Label Switching, multiprotocol label switching) frame format, comprise DA_L2, SA_L2,8847, TUL_L2, PWE_L2, DA, SA, TAG, IP field; Wherein, DA_L2 represents object MAC (Media Access Control Address, media access control address) address; SA_L2 represents source MAC; 8847 represent ethernet frame type (being indicated as multiprotocol label switching); TUL_L2 is label, for carrying PWE (pseudo-wire emulation, pseudo wire emulation); PWE_L2 is label, for searching forwarding; Residue field is payload (payload).
Shown in Figure 3, three layer services are IP (Internet Protocol, the agreement interconnected between network) frame format; Comprise DA_L3, SA_L3,8847, TUL_L3, PWE_L3, IP; Wherein, DA_L3 represents target MAC (Media Access Control) address; SA_L3 represents source MAC; TUL_L3 is label, for carrying PWE; PWE_L3 is label, for searching forwarding; IP represents payload.
Bridging functionality is exactly realize the conversion between MPLS frame format and IP frame format, and existing switch cannot realize two layer service process and three layer service process once forwarding simultaneously, therefore needs to perform secondary and forwards and realize bridge joint function.
Traditional method adopts the interconnection of physics mouth to realize secondary to forward, but this can cause the minimizing of panel terminal port resource, and cannot meet working stamndard.In order to overcome this defect, usually adopting loopback interface to realize secondary and forwarding, the VC (Virtual circuit, virtual circuit) of MPLS frame is mapped to different loopback interface.But this method need utilize multiple loopback interface, occupy a large amount of port resources, the switching system that port resource is limited cannot be applicable to.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of method and system realizing L2 VPN and L3 VPN bridge joint, present invention saves a large amount of port resources, the switching system that port resource is limited can be applicable to; Can bandwidth be saved, improve operating efficiency.
For reaching above object, the technical scheme that the present invention takes is: a kind of method realizing L2 VPN and L3 VPN bridge joint, comprise the following steps: step S1. defines the first loopback interface and the second loopback interface respectively: the entry attribute of the first loopback interface is defined as three layers of attribute, the outlet attribute definition of the first loopback interface is two layers of attribute; The entry attribute of the second loopback interface is defined as two layers of attribute, the outlet attribute definition of the second loopback interface is three layers of attribute; Step S2. judges service route, if service route is Layer 2 virtual private network L2 VPN to Layer3 Virtual Private Network L3 VPN, then jumps to step S3; If service route is L3 VPN to L2 VPN, then jump to step S5; Step S3. creates unidirectional two layer services between two layer interfaces to the first loopback interface, and business is converted to the frame format of loopback interface by multiprotocol label switching MPLS frame format; Business enters the first loopback interface from L2 VPN, jumps to step S4; Step S4. creates unidirectional three layer services between the first loopback interface to three layer interfaces, and business is converted to the protocol IP frame format interconnected between network by the frame format of loopback interface; Business enters L3 VPN from the first loopback interface, terminates; Step S5. creates unidirectional three layer services between three layer interfaces to the second loopback interface, and business is converted to the frame format of loopback interface by IP frame format; Business enters the second loopback interface from L3 VPN, jumps to step S6; Step S6. creates unidirectional two layer services between the second loopback interface to two layer interfaces, and business is converted to MPLS frame format by the frame format of loopback interface; Business enters L2 VPN from the second loopback interface, terminates.
On the basis of technique scheme, described first loopback interface and the second loopback interface are all arranged in the user network side interface of L2 VPN side.
On the basis of technique scheme, the frame format of described loopback interface comprises da field, sa field, TAG field, IP field, wherein: da field, for representing object media access control address MAC Address; Sa field, for representing source MAC; TAG field, for representing virtual LAN VLAN label; IP field, for representing payload.
On the basis of technique scheme, idiographic flow business being converted to the frame format of loopback interface by MPLS frame format is: terminate two layer services on the two-layer virtual sub-interface of the first loopback interface, and execution outlet VLAN translation action realizes TAG translation, then by the L 3 virtual sub-interface of service loop to the first loopback interface.
On the basis of technique scheme, in step S6, by the idiographic flow that business is converted to MPLS frame format by the frame format of loopback interface be: terminate three layer services on the L 3 virtual sub-interface of the second loopback interface, and by the two-layer virtual sub-interface of service loop to the second loopback interface, then perform ingress VLAN translation action and realize TAG translation.
On the basis of technique scheme, the idiographic flow of the described TAG of realization translation is: obtain TAG value by carrying out Hash operation to pseudo wire emulation PWE and virtual LAN VLAN.
The present invention also provides a kind of system realizing L2 VPN and L3 VPN bridge joint, comprise: loopback interface definition module, for defining the first loopback interface and the second loopback interface respectively: the entry attribute of the first loopback interface to be defined as three layers of attribute, the outlet attribute definition of the first loopback interface is two layers of attribute; The entry attribute of the second loopback interface is defined as two layers of attribute, the outlet attribute definition of the second loopback interface is three layers of attribute; Service route judge module, for judging service route, if service route is Layer 2 virtual private network L2 VPN to Layer3 Virtual Private Network L3 VPN, then generates the first triggering signal; If service route is L3 VPN to L2 VPN, then generate the second triggering signal; First unidirectional two layer service creation modules, for receiving the first triggering signal and creating unidirectional two layer services between two layer interfaces to the first loopback interface; Business is converted to the frame format of loopback interface by multiprotocol label switching MPLS frame format; Business enters the first loopback interface from L2 VPN, and generates the 3rd triggering signal; First unidirectional three layer service creation modules, for receiving the 3rd triggering signal and creating unidirectional three layer services between the first loopback interface to three layer interfaces; Business is converted to the protocol IP frame format interconnected between network by the frame format of loopback interface; Business enters L3 VPN from the first loopback interface, process ends; Second unidirectional three layer service creation modules, for receiving the second triggering signal and creating unidirectional three layer services between three layer interfaces to the second loopback interface; Business is converted to the frame format of loopback interface by IP frame format; Business enters the second loopback interface from L3 VPN, and generates the 4th triggering signal; Second unidirectional two layer service creation modules, for receiving the 4th triggering signal and creating unidirectional two layer services between the second loopback interface to two layer interfaces, and are converted to MPLS frame format by business by the frame format of loopback interface; Business enters L2 VPN from the second loopback interface, process ends.
On the basis of technique scheme, business is converted to the frame format of loopback interface by described first unidirectional two layer service creation modules idiographic flow by MPLS frame format is: terminate two layer services on the two-layer virtual sub-interface of the first loopback interface, and execution outlet VLAN translation action realizes TAG translation, then by the L 3 virtual sub-interface of service loop to the first loopback interface.
On the basis of technique scheme, the idiographic flow that business is converted to MPLS frame format by the frame format of loopback interface is by described second unidirectional two layer service creation modules: terminate three layer services on the L 3 virtual sub-interface of the second loopback interface, and by the two-layer virtual sub-interface of service loop to the second loopback interface, then perform ingress VLAN translation action and realize TAG translation.
On the basis of technique scheme, described first loopback interface and the second loopback interface are all arranged in the user network side interface of L2 VPN side.
Beneficial effect of the present invention is:
1, the present invention is by definition first loopback interface and the second loopback interface, realize L2/L3 VPN bridging functionality, namely only occupy a pair loopback interface (2 port resources), therefore, present invention saves a large amount of port resources, the switching system that port resource is limited can be applicable to.
2, in the present invention, the first loopback interface and the second loopback are all arranged in the UNI of L2 VPN side, can bandwidth be saved, improve operating efficiency.Such as, in the convergent type switching system of the corresponding NNI of two UNI, each UNI and NNI only consumes 2 times of bandwidth.
Accompanying drawing explanation
Fig. 1 is traditional PTN networking structure figure;
Fig. 2 is MPLS frame format schematic diagram;
Fig. 3 is IP frame format schematic diagram;
Fig. 4 is the method flow diagram realizing L2 VPN and L3 VPN bridge joint in the embodiment of the present invention;
Fig. 5 is the frame format schematic diagram of loopback interface in the embodiment of the present invention;
Fig. 6 is TAG mapping mode schematic diagram in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Shown in Figure 4, the embodiment of the present invention provides a kind of method realizing L2 VPN and L3 VPN bridge joint, comprises the following steps:
Step S1. specifies any two unappropriated interfaces as the first loopback interface and the second loopback interface, define the first loopback interface and the second loopback interface respectively: the entry attribute of the first loopback interface is defined as three layers of attribute, the outlet attribute definition of the first loopback interface is two layers of attribute; The entry attribute of the second loopback interface is defined as two layers of attribute, the outlet attribute definition of the second loopback interface is three layers of attribute.Preferably, described first loopback interface and the second loopback interface are all arranged in the user network side interface of L2 VPN side.
Step S2. judges service route, if service route is Layer 2 virtual private network L2 VPN to Layer3 Virtual Private Network L3 VPN, then jumps to step S3; If service route is L3 VPN to L2 VPN, then jump to step S5.
Step S3. creates unidirectional two layer services between two layer interfaces to the first loopback interface, and business is converted to the frame format of loopback interface by multiprotocol label switching MPLS frame format; Business enters the first loopback interface from L2 VPN, jumps to step S4; Concrete, idiographic flow business being converted to the frame format of loopback interface by MPLS frame format is: terminate two layer services on the two-layer virtual sub-interface of the first loopback interface, and perform EVE (egress vlan edit, outlet VLAN translation) action realize TAG translation, then by the L 3 virtual sub-interface of service loop to the first loopback interface.
Step S4. creates unidirectional three layer services between the first loopback interface to three layer interfaces, and business is converted to the protocol IP frame format interconnected between network by the frame format of loopback interface; Business enters L3 VPN from the first loopback interface, terminates.
Step S5. creates unidirectional three layer services between three layer interfaces to the second loopback interface, and business is converted to the frame format of loopback interface by IP frame format; Business enters the second loopback interface from L3 VPN, jumps to step S6.
Step S6. creates unidirectional two layer services between the second loopback interface to two layer interfaces, and business is converted to MPLS frame format by the frame format of loopback interface; Business enters L2 VPN from the second loopback interface, terminates.Concrete, by the idiographic flow that business is converted to MPLS frame format by the frame format of loopback interface be: terminate three layer services on the L 3 virtual sub-interface of the second loopback interface, and by the two-layer virtual sub-interface of service loop to the second loopback interface, then perform IVE (ingress vlan edit, ingress VLAN is translated) action and realize TAG translation.
Shown in Figure 5, the frame format of described loopback interface comprises da field, sa field, TAG field, IP field, wherein:
Da field, for representing object media access control address MAC Address.
Sa field, for representing source MAC.
TAG field, for representing virtual LAN VLAN label.
IP field, for representing payload.
Shown in Figure 6, the idiographic flow of the described TAG of realization translation is: obtain TAG value by carrying out HASH (Hash) computing to pseudo wire emulation PWE and virtual LAN VLAN, therefore TAG value can identify PWE and VLAN two-dimensional signal.
The embodiment of the present invention also provides a kind of system realizing L2 VPN and L3 VPN bridge joint, comprising:
Loopback interface definition module, for defining the first loopback interface and the second loopback interface respectively: the entry attribute of the first loopback interface to be defined as three layers of attribute, the outlet attribute definition of the first loopback interface is two layers of attribute; The entry attribute of the second loopback interface is defined as two layers of attribute, the outlet attribute definition of the second loopback interface is three layers of attribute.Preferably, described first loopback interface and the second loopback interface are all arranged in the user network side interface of L2 VPN side.
Service route judge module, for judging service route, if service route is Layer 2 virtual private network L2 VPN to Layer3 Virtual Private Network L3 VPN, then generates the first triggering signal; If service route is L3 VPN to L2 VPN, then generate the second triggering signal.
First unidirectional two layer service creation modules, for receiving the first triggering signal and creating unidirectional two layer services between two layer interfaces to the first loopback interface; Business is converted to the frame format of loopback interface by multiprotocol label switching MPLS frame format; Business enters the first loopback interface from L2 VPN, and generates the 3rd triggering signal.Wherein, business is converted to the frame format of loopback interface by described first unidirectional two layer service creation modules idiographic flow by MPLS frame format is: terminate two layer services on the two-layer virtual sub-interface of the first loopback interface, and execution outlet VLAN translation action realizes TAG translation, then by the L 3 virtual sub-interface of service loop to the first loopback interface.
First unidirectional three layer service creation modules, for receiving the 3rd triggering signal and creating unidirectional three layer services between the first loopback interface to three layer interfaces; Business is converted to the protocol IP frame format interconnected between network by the frame format of loopback interface; Business enters L3 VPN from the first loopback interface, process ends.
Second unidirectional three layer service creation modules, for receiving the second triggering signal and creating unidirectional three layer services between three layer interfaces to the second loopback interface; Business is converted to the frame format of loopback interface by IP frame format; Business enters the second loopback interface from L3 VPN, and generates the 4th triggering signal.
Second unidirectional two layer service creation modules, for receiving the 4th triggering signal and creating unidirectional two layer services between the second loopback interface to two layer interfaces, and are converted to MPLS frame format by business by the frame format of loopback interface; Business enters L2 VPN from the second loopback interface, process ends.Wherein, the idiographic flow that business is converted to MPLS frame format by the frame format of loopback interface is by described second unidirectional two layer service creation modules: terminate three layer services on the L 3 virtual sub-interface of the second loopback interface, and by the two-layer virtual sub-interface of service loop to the second loopback interface, then perform ingress VLAN translation action and realize TAG translation.
The present invention is not limited to above-mentioned execution mode, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. realize a method for L2VPN and L3VPN bridge joint, it is characterized in that, comprise the following steps:
Step S1. defines the first loopback interface and the second loopback interface respectively: the entry attribute of the first loopback interface is defined as three layers of attribute, and the outlet attribute definition of the first loopback interface is two layers of attribute; The entry attribute of the second loopback interface is defined as two layers of attribute, the outlet attribute definition of the second loopback interface is three layers of attribute;
Step S2. judges service route, if service route be Layer 2 virtual private network L2VPN to Layer3 Virtual Private Network L3VPN, then jump to step S3; If service route is L3VPN to L2VPN, then jump to step S5;
Step S3. creates unidirectional two layer services between two layer interfaces to the first loopback interface, and business is converted to the frame format of loopback interface by multiprotocol label switching MPLS frame format; Business enters the first loopback interface from L2VPN, jumps to step S4;
Step S4. creates unidirectional three layer services between the first loopback interface to three layer interfaces, and business is converted to the protocol IP frame format interconnected between network by the frame format of loopback interface; Business enters L3VPN from the first loopback interface, terminates;
Step S5. creates unidirectional three layer services between three layer interfaces to the second loopback interface, and business is converted to the frame format of loopback interface by IP frame format; Business enters the second loopback interface from L3VPN, jumps to step S6;
Step S6. creates unidirectional two layer services between the second loopback interface to two layer interfaces, and business is converted to MPLS frame format by the frame format of loopback interface; Business enters L2VPN from the second loopback interface, terminates.
2. realize the method for L2VPN and L3VPN bridge joint as claimed in claim 1, it is characterized in that: described first loopback interface and the second loopback interface are all arranged in the user network side interface of L2VPN side.
3. realize the method for L2VPN and L3VPN bridge joint as claimed in claim 1, it is characterized in that: the frame format of described loopback interface comprises da field, sa field, TAG field, IP field, wherein:
Da field, for representing object media access control address MAC Address;
Sa field, for representing source MAC;
TAG field, for representing virtual LAN VLAN label;
IP field, for representing payload.
4. realize the method for L2VPN and L3VPN bridge joint as claimed in claim 3, it is characterized in that, in step S3, idiographic flow business being converted to the frame format of loopback interface by MPLS frame format is: terminate two layer services on the two-layer virtual sub-interface of the first loopback interface, and execution outlet VLAN translation action realizes TAG translation, then by the L 3 virtual sub-interface of service loop to the first loopback interface.
5. realize the method for L2VPN and L3VPN bridge joint as claimed in claim 3, it is characterized in that: in step S6, by the idiographic flow that business is converted to MPLS frame format by the frame format of loopback interface be: terminate three layer services on the L 3 virtual sub-interface of the second loopback interface, and by the two-layer virtual sub-interface of service loop to the second loopback interface, then perform ingress VLAN translation action and realize TAG translation.
6. the method realizing L2VPN and L3VPN bridge joint as described in claim 4 or 5, is characterized in that, the idiographic flow of the described TAG of realization translation is: obtain TAG value by carrying out Hash operation to pseudo wire emulation PWE and virtual LAN VLAN.
7. realize a system for L2VPN and L3VPN bridge joint, it is characterized in that, comprising:
Loopback interface definition module, for defining the first loopback interface and the second loopback interface respectively: the entry attribute of the first loopback interface to be defined as three layers of attribute, the outlet attribute definition of the first loopback interface is two layers of attribute; The entry attribute of the second loopback interface is defined as two layers of attribute, the outlet attribute definition of the second loopback interface is three layers of attribute;
Service route judge module, for judging service route, if service route be Layer 2 virtual private network L2VPN to Layer3 Virtual Private Network L3VPN, then generate the first triggering signal; If service route is L3VPN to L2VPN, then generate the second triggering signal;
First unidirectional two layer service creation modules, for receiving the first triggering signal and creating unidirectional two layer services between two layer interfaces to the first loopback interface; Business is converted to the frame format of loopback interface by multiprotocol label switching MPLS frame format; Business enters the first loopback interface from L2VPN, and generates the 3rd triggering signal;
First unidirectional three layer service creation modules, for receiving the 3rd triggering signal and creating unidirectional three layer services between the first loopback interface to three layer interfaces; Business is converted to the protocol IP frame format interconnected between network by the frame format of loopback interface; Business enters L3VPN from the first loopback interface, process ends;
Second unidirectional three layer service creation modules, for receiving the second triggering signal and creating unidirectional three layer services between three layer interfaces to the second loopback interface; Business is converted to the frame format of loopback interface by IP frame format; Business enters the second loopback interface from L3VPN, and generates the 4th triggering signal;
Second unidirectional two layer service creation modules, for receiving the 4th triggering signal and creating unidirectional two layer services between the second loopback interface to two layer interfaces, and are converted to MPLS frame format by business by the frame format of loopback interface; Business enters L2VPN from the second loopback interface, process ends.
8. realize the system of L2VPN and L3VPN bridge joint as claimed in claim 7, it is characterized in that, business is converted to the frame format of loopback interface by described first unidirectional two layer service creation modules idiographic flow by MPLS frame format is: terminate two layer services on the two-layer virtual sub-interface of the first loopback interface, and execution outlet VLAN translation action realizes TAG translation, then by the L 3 virtual sub-interface of service loop to the first loopback interface.
9. realize the system of L2VPN and L3VPN bridge joint as claimed in claim 7, it is characterized in that, the idiographic flow that business is converted to MPLS frame format by the frame format of loopback interface is by described second unidirectional two layer service creation modules: terminate three layer services on the L 3 virtual sub-interface of the second loopback interface, and by the two-layer virtual sub-interface of service loop to the second loopback interface, then perform ingress VLAN translation action and realize TAG translation.
10. realize the system of L2VPN and L3VPN bridge joint as claimed in claim 7, it is characterized in that: described first loopback interface and the second loopback interface are all arranged in the user network side interface of L2VPN side.
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| CN108156066A (en) * | 2017-12-29 | 2018-06-12 | 杭州迪普科技股份有限公司 | Message forwarding method and device |
| CN108156066B (en) * | 2017-12-29 | 2021-06-29 | 杭州迪普科技股份有限公司 | Message forwarding method and device |
| CN109379268A (en) * | 2018-11-27 | 2019-02-22 | 新华三技术有限公司合肥分公司 | Creation method, device and the server of Virtual Private Network |
| CN109379268B (en) * | 2018-11-27 | 2021-05-07 | 新华三技术有限公司合肥分公司 | Virtual private network creating method and device and server |
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