CN102377607A - Data transmission method and data transmission device for special two-layer virtual network - Google Patents
Data transmission method and data transmission device for special two-layer virtual network Download PDFInfo
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- CN102377607A CN102377607A CN2010102521096A CN201010252109A CN102377607A CN 102377607 A CN102377607 A CN 102377607A CN 2010102521096 A CN2010102521096 A CN 2010102521096A CN 201010252109 A CN201010252109 A CN 201010252109A CN 102377607 A CN102377607 A CN 102377607A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
- H04L63/0272—Virtual private networks
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Abstract
The embodiment of the invention provides a data transmission method and a data transmission device for a special two-layer virtual network. The data transmission method is applied to a network comprising a main virtual link and a standby virtual link which are born by traffic engineering, wherein the main virtual link passes an upstream node and a downstream node. The data transmission method comprises the following steps of: detecting a connection state of a communication link to be protected between the upstream node and the downstream node and determining whether the communication link to be protected has faults or not by the upstream node; if the communication link to be protected has faults, carrying out fast rerouting switch on the traffic engineering and transmitting and switching data to a pre-established standby label exchange channel for protecting the communication link to be protected by the upstream node; and triggering the virtual link to switch by the upstream node. According to the embodiment of the invention, when the link has faults, a fast rerouting is locally protected through the traffic engineering and then the virtual link is smoothly switched, so that the speed of fault detection and flow switch is improved and the service interruption time when the link has the faults is shortened.
Description
Technical field
The embodiment of the invention relates to the communication technology, relates in particular to a kind of data transmission method and device that is used for two-layer virtual private network.
Background technology
Along with two-layer virtual private network (Layer 2 Virtual Private Network are designated hereinafter simply as: extensive use L2VPN), to L2VPN, especially increasingly high to the reliability requirement of the L2VPN network of real-time services such as carrying VoIP, IPTV.(Pseudo Wire is designated hereinafter simply as: PW) redundant (Redundancy) is one of technology that improves the L2VPN network reliability to virtual link.In the PW redundant technique, can detect through two-way forwarding (Bidirectional Forwarding Detection is designated hereinafter simply as: the BFD) fault of mechanism detection L2VPN network, and carry out fault notification and flow then and switch fast.
Fig. 1 is the sketch map of the data transmission method of existing L2VPN network.As shown in Figure 1, (Customer Edge is designated hereinafter simply as: CE) between CE1 and the CE2 on two user borders; Operator edge (Provider Edge; Be designated hereinafter simply as PE) 1 set up the L2VPN of PE2 and PE3, wherein PE1-P1-PE2 is main PW, PE1-P2-PE3 is for being equipped with PW.BFD control message after transmission on the main PW link is through the PW encapsulation is controlled the state that message detects the main PW between PE1 and the PE2 by BFD.When PE1 does not receive the BFD control message that PE2 sends in preset assay intervals, then detect main PW link occurs fault, PE1 carries out the flow switching then, switches to PW fully by main PW, has realized the protect networks to L2VPN through the PW redundancy thus.
But the PW redundancy is a resist technology end to end, when network topology is complicated; For fear of the BFD vibration occurring; The BFD assay intervals need dispose higher value, and the speed that makes BFD fault detect and flow switch thus is low, and the service outage duration during link occurs fault is long.
Summary of the invention
The embodiment of the invention provides a kind of data transmission method and device that is used for two-layer virtual private network, to improve the speed that fault detect and flow switch, the service outage duration when reducing link occurs fault.
The embodiment of the invention provides a kind of data transmission method that is used for two-layer virtual private network; Be applied to comprise that said main virtual link is through a upstream node and a downstream node, wherein in main virtual link that carries with traffic engineering and the network that is equipped with virtual link; When subscriber equipment when said main virtual link sends data; Data arrive said upstream node earlier, and the back arrives said downstream node, and said method comprises:
Said upstream node detects the connection status of the communication link to be protected between said upstream node and the downstream node, confirms whether said communication link to be protected breaks down;
If said communication link to be protected breaks down, then said upstream node carries out the quick heavy-route of traffic engineering and switches, and transfer of data is switched to that set up, that be used to protect said communication link to be protected in advance subsequent use label switched path;
Said upstream node triggers virtual link and switches, and transfer of data is switched to the virtual link that is equipped with that is used to protect said main virtual link from said main virtual link.
The embodiment of the invention also provides a kind of data transmission device that is used for two-layer virtual private network, comprising:
Detection module; Be used to detect the said data transmission device of the main virtual link process of carrying and the connection status of the communication link to be protected between the downstream node with traffic engineering; Confirm whether said communication link to be protected breaks down, wherein, when subscriber equipment when said main virtual link sends data; Data arrive said data transmission device node earlier, and the back arrives said downstream node;
Handover module; Be used for after said detection module confirms that said communication link to be protected breaks down; Carry out the quick heavy-route of traffic engineering and switch, transfer of data is switched to that set up, that be used to protect said communication link to be protected in advance subsequent use label switched path;
Trigger module is used for carrying out the quick heavy-route of traffic engineering at said handover module and switches the switching of back triggering virtual link, and transfer of data is switched to the virtual link that is equipped with that is used to protect said main virtual link from said main virtual link.
The data transmission method that is used for two-layer virtual private network and the device of the embodiment of the invention; Upstream node is after detecting communication link to be protected between said upstream node and the downstream node and breaking down; Carrying out the quick heavy-route of traffic engineering earlier switches; Transfer of data is switched in the subsequent use label switched path of setting up in advance, trigger virtual link then and switch, make head node carry out taking over seamlessly of virtual link; Because when link occurs fault, carry out localised protection through the quick heavy-route of traffic engineering earlier, and then carry out the virtual link redundancy and take over seamlessly, improved the speed of fault detect and flow switching thus, the service outage duration when having reduced link occurs fault.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done an introduction simply in will describing embodiment below; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the sketch map of the data transmission method of existing L2VPN network;
Fig. 2 is used for the flow chart of the data transmission method embodiment one of two-layer virtual private network for the present invention;
Fig. 3 is used for the flow chart of the data transmission method embodiment two of two-layer virtual private network for the present invention;
Fig. 4 is used for the sketch map of the data transmission method embodiment two of two-layer virtual private network for the present invention;
Fig. 5 is used for the flow chart of the data transmission method embodiment three of two-layer virtual private network for the present invention;
Fig. 6 is used for the sketch map of the data transmission method embodiment three of two-layer virtual private network for the present invention;
Fig. 7 is used for the sketch map of the data transmission device embodiment one of two-layer virtual private network for the present invention;
Fig. 8 is used for the sketch map of the data transmission device embodiment two of two-layer virtual private network for the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 2 is used for the flow chart of the data transmission method embodiment one of two-layer virtual private network for the present invention; Said embodiment is applied to comprise main virtual link (the Pseudo Wire that carries with traffic engineering; PW) and be equipped with Layer 2 virtual private network (the Layer 2 Virtual Private Network of PW; L2VPN) in, said main PW is through a upstream node and a downstream node.Wherein, when subscriber equipment when said main virtual link sends data, data arrive said upstream node earlier, the back arrives said downstream node.As shown in Figure 2, said method comprises:
Preferably, said upstream node and said downstream node are two adjacent routing devices, between these two routing devices, can be connected with non-routing device, and non-routing device for example can be for not possessing the transmission equipment of routing function.
Said upstream node can be the head node on the said main PW, also can be the intermediate node on the said main PW; Said downstream node can be the intermediate node on the said main PW, also can be the tail node on the said main PW.Wherein, said head node is the node of the active and standby switching of virtual link of carrying out transfer of data, and said tail node is the node of PW termination, said intermediate node be said main PW process, the node between said head node and said tail node.
After said upstream node detected said communication link to be protected and breaks down, said upstream node carried out TE FRR and switches, and transfer of data is switched to the subsequent use LSP that sets up in advance, protects said communication link to be protected; Wherein, the said subsequent use LSP that sets up in advance is used to protect said communication link to be protected.
Preferably, said upstream node can be phy-aware or BFD perception to the testing mechanism that said communication link to be protected connects situation.Because it is fairly simple that the communication link between said upstream node and the said downstream node connects; So detect the rapid speed that said communication link connects situation; When link failure occurring, can perceive faster thus; And carry out TE FRR switching timely, make time of service interruption very short.
Comprise said main PW and the said PW that is equipped with among the said L2VPN, the said PW that is equipped with is used for said main PW is protected, and when the head node of said main PW process is known said main PW link occurs fault, can transfer of data be switched to the said PW of being equipped with from said main PW.Preferably, said head node can be the upstream boundary router.
After said upstream node carries out said TE FRR switching, trigger said PW and switch; Wherein said upstream node can be the intermediate node on the said main PW, also can be the head node on the said main PW, when upstream node is dissimilar node, and said triggerings PW switching way difference that it is corresponding.
Preferably; When said upstream node is the intermediate node of said main PW process; Said upstream node is carrying out after said TE FRR switches, and sends to the head node of said main PW process to be used to trigger the Indication message that PW switches, and makes head node according to said Indication message; Carry out PW and take over seamlessly, transfer of data is switched to the said PW of being equipped with from said main PW.Possibly pass through a plurality of intermediate nodes at said main PW; The embodiment of the invention can be applied on arbitrary intermediate node; After arbitrary intermediate node detects the to be protected communication link corresponding with it and breaks down; Can carry out said TE FRR earlier and switch, send the said Indication message that is used to switch to said head node then, the PW that makes head node carry out transfer of data switches.
Preferably, when said upstream node was the head node of said main PW process, said upstream node carried out PW and takes over seamlessly after carrying out said TE FRR switching, and transfer of data is switched to the said PW of being equipped with from said main PW.
According to the embodiment of the invention; Said upstream node is after detecting communication link to be protected between said upstream node and the downstream node and breaking down; Carry out said TE FRR earlier and switch, transfer of data is switched among the subsequent use LSP that sets up in advance, the PW of trigger data transmission switches then; Make head node carry out taking over seamlessly of PW, data traffic is switched to the said PW of being equipped with from said main PW; Because when link occurs fault, carry out localised protection through said TE FRR earlier, and then the PW that carries out transfer of data takes over seamlessly, improved the speed of fault detect and flow switching thus, the service outage duration when having reduced link occurs fault.
The data transmission method that is used for L2VPN that the embodiment of the invention provides can be applied in user border (Customer Edge; Be designated hereinafter simply as: CE) in the asymmetric access networking; Also can be applied in the CE symmetry and insert in the networking, below respectively with the application of the specific embodiment explanation embodiment of the invention in these two kinds of networkings.
Fig. 3 is used for the flow chart of the data transmission method embodiment two of two-layer virtual private network for the present invention; Fig. 4 is used for the sketch map of the data transmission method embodiment two of two-layer virtual private network for the present invention; Present embodiment is applied in the asymmetric access networking of CE; On the basis of method embodiment one, like Fig. 3 and shown in Figure 4, said method comprises:
In the present embodiment, PE1 is the head node on the main PW, and said P1 is the intermediate node that is positioned on the said main PW, and said PE2 is the tail node on the said main PW; P2 is positioned at the intermediate node that is equipped with on the PW, and PE3 is the tail node that is positioned on the said PW of being equipped with.In the present embodiment, said P1 can be equivalent to the upstream node among the method embodiment one.
Between said P1 and said PE2, set up the Bypass tunnel in advance, be used to protect the communication link to be protected between said P1 and the said PE2.
In the asymmetric access networking of said CE, said PE1 is established to the L2VPN of said PE2 and said PE3, and wherein specifying said PE1 is said main PW to the PW of said PE2, and the said PE1 extremely PW of said PE3 is the said PW of being equipped with.PW carries through TE, and the LSP path in configuration TE master tunnel is PE1-P1-PE2; And on said P1, set up the Bypass tunnel of TE in advance, and the LSP path in said Bypass tunnel is P1-P2-PE2, promptly subsequent use LSP path is P1-P2-PE2, is used to protect the link P1-PE2 said to be protected on the TE master tunnel.Alternatively, when setting up said subsequent use LSP, can use the P2 on the said PW of being equipped with, also can use the node on other any link to replace P2.
Detect the connection status of the communication link between said P1 and the said PE2 through phy-aware or BFD perception.
When said P1 (local recovery node; PLR) perceive after said P1 breaks down to the link of said PE2; Said P1 carries out said TE FRR and switches; Flow is switched to said Bypass tunnel, be about to flow and switch to pre-configured said subsequent use LSP path (P1-P2-PE2), protect said main tunnel with this.
After said P1 carried out said TE FRR switching, said P1 sent to the said PE1 that is positioned at the upper reaches and carries path error (PathError) message of switching sign.
After said PE1 receives said PathError message, carry out said PW and take over seamlessly, transfer of data is switched to said backup path PE1-P2-PE3 from said main PW.
In step 301-step 305, said P1 is equivalent to the said upstream node among the method embodiment one, and PE1 is equivalent to the said head node among the method embodiment one, and PE2 is equivalent to the said tail node among the method embodiment one.
Alternatively, the said PE1 in the present embodiment also can be equivalent to the upstream node among the method embodiment one, and when said PE1 was equivalent to the upstream node among the method embodiment one, the embodiment of the invention can may further comprise the steps:
A, between PE1 and P1, set up the Bypass tunnel be used to protect TE master tunnel in advance, the LSP path in said Bypass tunnel is PE1-P2-P1;
B, detect the connection status of the link between said PE1 and the said P1 through physical detection or BFD mechanism; After the link occurs fault between said PE1 and the said P1; Said PE1 carries out TE FRR and switches, and transfer of data is switched to said Bypass tunnel (PE1-P2-P1);
C, PE1 switch to the said PW of being equipped with transfer of data from said main PW after carrying out said TE FRR switching.
The embodiment of the invention; After the link occurs fault that detects between said PE1 and said P1 or said P1 and the said PE2, carry out TE FRR earlier and switch, transfer of data is switched among the subsequent use LSP that sets up in advance; Trigger PW then and switch, make said PE1 carry out taking over seamlessly of PW.Because when link occurs fault, carry out localised protection through TE FRR earlier, and then carry out PW and take over seamlessly, improved the speed of fault detect and flow switching thus, the service outage duration when having reduced link occurs fault.
Fig. 5 is used for the flow chart of the data transmission method embodiment three of two-layer virtual private network for the present invention; Fig. 6 is used for the sketch map of the data transmission method embodiment three of two-layer virtual private network for the present invention; Present embodiment is applied in the CE symmetry and inserts in the networking; On the basis of method embodiment one, like Fig. 5 and shown in Figure 6, said method comprises:
In the present embodiment, PE1 is the head node on the main PW, and said P1 is the intermediate node that is positioned on the said main PW, and said PE2 is the tail node on the said main PW; P2 is positioned at the intermediate node that is equipped with on the PW.In the present embodiment, said P1 can be equivalent to the upstream node among the method embodiment one.
Between said P1 and said PE2, set up the Bypass tunnel in advance, be used to protect the communication link to be protected between said P1 and the said PE2.
Insert in the networking in the CE symmetry, said PE1 is established to the L2VPN of said PE2, and PW carries through TE, and the LSP path that the traffic engineering tunnel of said main PW is carried in configuration is PE1-P1-PE2, and the LSP path of carrying the traffic engineering tunnel of the said PW of being equipped with is PE1-P2-PE2; And on said P1, set up the Bypass tunnel in advance, and the LSP path in said Bypass tunnel is P1-P2-PE2, promptly subsequent use LSP path is P1-P2-PE2, is used to protect the link P1-PE2 to be protected on the TE master tunnel of said main PW.Alternatively, when setting up said subsequent use LSP, can use the P2 on the PW fully, also can use the node on other any link to replace P2.
Detect the connection status of the communication link between said P1 and the said PE2 through phy-aware or BFD perception.
After said P1 (PLR) the perception said P1 in road breaks down to the link of said PE2; Said P1 carries out said TE FRR and switches; Flow is switched to said Bypass tunnel, be about to flow and switch to pre-configured said subsequent use LSP path (P1-P2-PE2), protect the tunnel with this.
After said P1 carried out said TE FRR switching, said P1 sent to the said PE1 that is positioned at the upper reaches and carries path error (PathError) message of switching sign.
After step 505, said PE1 received said Indication message (PathError message), notice PW did and takes over seamlessly, and the said main PW of transfer of data is switched to the said PW of being equipped with.
After said PE1 receives said PathError message, carry out said PW and take over seamlessly, transfer of data is switched to said backup path PE1-P2-PE2 from said main PW.
In step 501-step 505, said P1 is equivalent to the said upstream node among the method embodiment one, and PE1 is equivalent to the said head node among the method embodiment one, and PE2 is equivalent to the said tail node among the method embodiment one.
Alternatively; Said PE1 in the present embodiment also can be equivalent to the said upstream node among the method embodiment one; When said PE1 was equivalent to the said upstream node among the method embodiment one, the embodiment of the invention can comprise like the step a-c among the method embodiment three, repeat no more at this.
The embodiment of the invention; After the link occurs fault that detects between said PE1 and said P1 or said P1 and the said PE2, carry out said TE FRR earlier and switch, transfer of data is switched among the said subsequent use LSP that sets up in advance; Trigger PW then and switch, make said PE1 carry out PW and take over seamlessly; Because when link occurs fault, carry out localised protection through said TE FRR earlier, and then carry out said PW and take over seamlessly, improved the speed of fault detect and flow switching thus, the service outage duration when having reduced link occurs fault.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; Said program the step that comprises said method embodiment when carrying out; Aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 7 is used for the sketch map of the data transmission device embodiment one of two-layer virtual private network for the present invention, and as shown in Figure 7, said data transmission device comprises: detection module 71, handover module 73 and trigger module 75.
Alternatively, the data transmission device that is used for two-layer virtual private network that present embodiment provides can be the intermediate node of said main PW process, also can be the head node of said main PW process.The workflow of each module and operation principle repeat no more at this referring to the description among above-mentioned each method embodiment in the present embodiment.
The embodiment of the invention; After detection module detects communication link said to be protected between said data transmission device and the said downstream node and breaks down; Said handover module carries out said TE FRR earlier and switches, and transfer of data is switched among the said subsequent use LSP that sets up in advance, and said then trigger module triggers PW and switches; Make head node carry out taking over seamlessly of PW, transfer of data is switched to the said PW of being equipped with from said main PW.Because when link occurs fault, carry out localised protection through said TE FRR earlier, and then carry out said PW and take over seamlessly, improved the speed of fault detect and flow switching thus, the service outage duration when having reduced link occurs fault.
Fig. 8 is used for the sketch map of the data transmission device embodiment two of two-layer virtual private network for the present invention.
Preferably, on the basis that comprises data transmission device embodiment one full content, said data transmission device also comprises: create module 77.
Said establishment module 77 is used between said data transmission device and said downstream node, setting up subsequent use label switched path.
Preferably, on the basis that comprises data transmission device embodiment one full content, said trigger module 75 comprises: first trigger element 751 and/or second trigger element 753.
Said first trigger element 751 is used for when said data transmission device is not the head node of said main virtual link process; Head node transmission to said main virtual link process carries the Indication message switching sign, that be used to trigger the virtual link switching, makes said head node according to said Indication message transfer of data switched to the said virtual link that is equipped with from said main virtual link.Preferably; Said first trigger element 751 specifically can be used for when said data transmission device is not the head node of main virtual link process; Head node transmission to main virtual link process carries the path error message switching sign, that be used to trigger the virtual link switching, makes head node according to path error message transfer of data switched to the said virtual link that is equipped with from said main virtual link.
Said second trigger element 753 is used for when said data transmission device is the head node of said main virtual link process, after carrying out the quick heavy-route switching of said traffic engineering, transfer of data is switched to the said virtual link that is equipped with from said main virtual link.
In data transmission device embodiment one, two according to the invention, said head node is the node of the active and standby switching of virtual link of execution transfer of data; Said data transmission device and downstream node can be adjacent routing device, and wherein, adjacent routing device is meant and between two routing devices, do not have other routing devices, but can have non-routing device, for example do not possess the transmission equipment of routing function.
The workflow of each module and operation principle repeat no more at this referring to the description among above-mentioned each method embodiment in the present embodiment.
The embodiment of the invention; After detection module detects communication link to be protected between said data transmission device and the downstream node and breaks down; Handover module carries out TE FRR earlier and switches; Transfer of data is switched among the subsequent use LSP that sets up in advance, and trigger module triggers the PW switching then, makes head node carry out taking over seamlessly of PW; Because when link occurs fault, carry out localised protection through TE FRR earlier, and then carry out PW and take over seamlessly, improved the speed of fault detect and flow switching thus, the service outage duration when having reduced link occurs fault.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (11)
1. a data transmission method that is used for two-layer virtual private network is applied to comprise that said main virtual link is through a upstream node and a downstream node in main virtual link that carries with traffic engineering and the network that is equipped with virtual link; Wherein, When subscriber equipment when said main virtual link sends data, data arrive said upstream node earlier, the back arrives said downstream node; It is characterized in that said method comprises:
Said upstream node detects the connection status of the communication link to be protected between said upstream node and the downstream node, confirms whether said communication link to be protected breaks down;
If said communication link to be protected breaks down, then said upstream node carries out the quick heavy-route of traffic engineering and switches, and transfer of data is switched to that set up, that be used to protect said communication link to be protected in advance subsequent use label switched path;
Said upstream node triggers virtual link and switches, and transfer of data is switched to the virtual link that is equipped with that is used to protect said main virtual link from said main virtual link.
2. the data transmission method that is used for two-layer virtual private network according to claim 1; It is characterized in that; Said upstream node triggers virtual link and switches, and transfer of data is switched to from said main virtual link be used to protect the virtual link that is equipped with of said main virtual link to comprise:
Said upstream node sends the Indication message that carries the switching sign, is used to trigger the virtual link switching to the head node of said main virtual link process, makes said head node according to said Indication message transfer of data switched to the said virtual link that is equipped with from said main virtual link;
Said head node is the node of the active and standby switching of virtual link of execution transfer of data.
3. the data transmission method that is used for two-layer virtual private network according to claim 2 is characterized in that, said Indication message is a path error message.
4. the data transmission method that is used for two-layer virtual private network according to claim 1; It is characterized in that; Said upstream node triggers virtual link and switches, and transfer of data is switched to from said main virtual link be used to protect the virtual link that is equipped with of said main virtual link to comprise:
Said upstream node switches to the said virtual link that is equipped with transfer of data from said main virtual link after carrying out the quick heavy-route switching of said traffic engineering;
Said upstream node is the node of the active and standby switching of virtual link of execution transfer of data.
5. according to the arbitrary described data transmission method that is used for two-layer virtual private network of claim 1-4, it is characterized in that, set up the subsequent use label switched path that is used to protect said communication link to be protected in the following manner:
Between said upstream node and said downstream node, set up said subsequent use label switched path.
6. according to the arbitrary described data transmission method that is used for two-layer virtual private network of claim 1-4, it is characterized in that said upstream node and said downstream node are adjacent routing device.
7. a data transmission device that is used for two-layer virtual private network is characterized in that, comprising:
Detection module; Be used to detect the said data transmission device of the main virtual link process of carrying and the connection status of the communication link to be protected between the downstream node with traffic engineering; Confirm whether said communication link to be protected breaks down, wherein, when subscriber equipment when said main virtual link sends data; Data arrive said data transmission device node earlier, and the back arrives said downstream node;
Handover module; Be used for after said detection module confirms that said communication link to be protected breaks down; Carry out the quick heavy-route of traffic engineering and switch, transfer of data is switched to that set up, that be used to protect said communication link to be protected in advance subsequent use label switched path;
Trigger module is used for carrying out the quick heavy-route of traffic engineering at said handover module and switches the switching of back triggering virtual link, and transfer of data is switched to the virtual link that is equipped with that is used to protect said main virtual link from said main virtual link.
8. the data transmission device that is used for two-layer virtual private network according to claim 7 is characterized in that, said trigger module comprises:
First trigger element; Be used for when said data transmission device is not the head node of said main virtual link process; Head node to said main virtual link process sends the Indication message that carries the switching sign, is used to trigger the virtual link switching, makes said head node according to said Indication message transfer of data switched to the said virtual link that is equipped with from said main virtual link; And/or
Second trigger element is used for when said data transmission device is the head node of said main virtual link process, after carrying out the quick heavy-route switching of said traffic engineering, transfer of data is switched to the said virtual link that is equipped with from said main virtual link;
Said head node is the node of the active and standby switching of virtual link of execution transfer of data.
9. the data transmission device that is used for two-layer virtual private network according to claim 8; It is characterized in that; Said first trigger element specifically is used for: when said data transmission device is not the head node of said main virtual link process; Head node to said main virtual link process sends the path error message that carries the switching sign, is used to trigger the virtual link switching, makes said head node according to said path error message transfer of data switched to the said virtual link that is equipped with from said main virtual link.
10. according to the arbitrary described data transmission device that is used for two-layer virtual private network of claim 7-9, it is characterized in that, also comprise:
Create module, be used between said data transmission device and said downstream node, setting up said subsequent use label switched path.
11., it is characterized in that said data transmission device and said downstream node are adjacent routing device according to the arbitrary described data transmission device that is used for two-layer virtual private network of claim 7-9.
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| PCT/CN2011/073655 WO2012016458A1 (en) | 2010-08-06 | 2011-05-04 | Method and apparatus for data transmission in layer 2 virtual private network |
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| Publication number | Publication date |
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| WO2012016458A1 (en) | 2012-02-09 |
| CN102377607B (en) | 2014-08-06 |
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