CN102377607B - 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 PDF

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CN102377607B
CN102377607B CN201010252109.6A CN201010252109A CN102377607B CN 102377607 B CN102377607 B CN 102377607B CN 201010252109 A CN201010252109 A CN 201010252109A CN 102377607 B CN102377607 B CN 102377607B
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virtual link
node
data transmission
link
data
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CN102377607A (en
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陈志华
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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]
    • 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
    • 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
    • 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

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

For data transmission method and the device of two-layer virtual private network
Technical field
The embodiment of the present invention relates to the communication technology, relates in particular to a kind of data transmission method for two-layer virtual private network and device.
Background technology
Along with two-layer virtual private network (Layer 2 Virtual Private Network, be designated hereinafter simply as: L2VPN) extensive use, to L2VPN, especially the reliability requirement of the L2VPN network to the real-time service such as carrying VoIP, IPTV is more and more higher.Virtual link (Pseudo Wire, is designated hereinafter simply as: PW) redundancy (Redundancy) is one of technology improving L2VPN network reliability.In PW redundant technique, can detect by two-way converting the fault of (Bidirectional Forwarding Detection, is designated hereinafter simply as: BFD) mechanism detection L2VPN network, then carry out fault notification and flow and switch fast.
Fig. 1 is the schematic diagram of the data transmission method of existing L2VPN network.As shown in Figure 1, at two user border (Customer Edge, be designated hereinafter simply as: CE) between CE1 and CE2, 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, and PE1-P2-PE3 is standby PW.The BFD transmitting on main PW link after encapsulating by PW controls message, is detected the state of the main PW between PE1 and PE2 by BFD control message.Control message when PE1 does not receive the BFD that PE2 sends in default assay intervals, main PW link occurs fault detected, then PE1 carries out flow switch, is switched to standby PW by main PW, has realized the protection to L2VPN network thus by PW redundancy.
But PW redundancy is resist technology end to end, in the time that network topology is complicated; for fear of occurring BFD vibration; BFD assay intervals need to configure higher value, makes thus the speed of BFD fault detect and flow switch low, and service outage duration when link occurs fault is long.
Summary of the invention
The embodiment of the present invention provides a kind of data transmission method for two-layer virtual private network and device, to improve the speed of fault detect and flow switch, and the service outage duration while reducing link occurs fault.
The embodiment of the present invention provides a kind of data transmission method for two-layer virtual private network, be applied in the main virtual link and the standby network of virtual link comprising with traffic engineering carrying, described main virtual link is through a upstream node and a downstream node, wherein, in the time that subscriber equipment sends data to described main virtual link, data first arrive described upstream node, the described downstream node of rear arrival, and described method comprises:
Described upstream node detects the connection status of the communication link to be protected between described upstream node and downstream node, determines whether described communication link to be protected breaks down;
If described communication link to be protected breaks down, described upstream node carries out the quick heavy-route of traffic engineering and switches, by transfer of data be switched to set up in advance, for the protection of the label switched path for subsequent use of described communication link to be protected;
Described upstream node triggers virtual link and switches, and transfer of data is switched to the standby virtual link for the protection of described main virtual link from described main virtual link.
The embodiment of the present invention also provides a kind of data transmission device for two-layer virtual private network, comprising:
Detection module, for detection of the connection status of the communication link to be protected between described data transmission device and the downstream node of the main virtual link process with traffic engineering carrying, determine whether described communication link to be protected breaks down, wherein, in the time that subscriber equipment sends data to described main virtual link, data first arrive described data transmission device node, the described downstream node of rear arrival;
Handover module, for after described detection module determines that described communication link to be protected breaks down, carry out the quick heavy-route of traffic engineering and switch, by transfer of data be switched to set up in advance, for the protection of the label switched path for subsequent use of described communication link to be protected;
Trigger module, switches for carry out triggering virtual link after the quick heavy-route of traffic engineering is switched at described handover module, and transfer of data is switched to the standby virtual link for the protection of described main virtual link from described main virtual link.
The data transmission method for two-layer virtual private network of the embodiment of the present invention and device, upstream node is after detecting that communication link to be protected between described upstream node and downstream node breaks down, first carrying out the quick heavy-route of traffic engineering switches, transfer of data is switched in the label switched path for subsequent use of setting up in advance, then trigger virtual link and switch, make head node carry out taking over seamlessly of virtual link; Due to when the link occurs fault, first carry out localised protection by the quick heavy-route of traffic engineering, and then carry out virtual link redundancy and take over seamlessly, improve thus the speed of fault detect and flow switch, the service outage duration while having reduced link occurs fault.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of the data transmission method of existing L2VPN network;
Fig. 2 is the flow chart of the present invention for the data transmission method embodiment mono-of two-layer virtual private network;
Fig. 3 is the flow chart of the present invention for the data transmission method embodiment bis-of two-layer virtual private network;
Fig. 4 is the schematic diagram of the present invention for the data transmission method embodiment bis-of two-layer virtual private network;
Fig. 5 is the flow chart of the present invention for the data transmission method embodiment tri-of two-layer virtual private network;
Fig. 6 is the schematic diagram of the present invention for the data transmission method embodiment tri-of two-layer virtual private network;
Fig. 7 is the schematic diagram of the present invention for the data transmission device embodiment mono-of two-layer virtual private network;
Fig. 8 is the schematic diagram of the present invention for the data transmission device embodiment bis-of two-layer virtual private network.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 2 is the flow chart of the present invention for the data transmission method embodiment mono-of two-layer virtual private network, described embodiment is applied to main virtual link (the Pseudo Wire comprising with traffic engineering carrying, and Layer 2 virtual private network (the Layer 2 Virtual Private Network of standby PW PW), L2VPN), in, described main PW is through a upstream node and a downstream node.Wherein, in the time that subscriber equipment sends data to described main virtual link, data first arrive described upstream node, the described downstream node of rear arrival.As shown in Figure 2, described method comprises:
Step 201, described upstream node detect with traffic engineering (Traffic Engineering; be designated hereinafter simply as: TE) carrying main virtual link (Pseudo Wire; be designated hereinafter simply as: PW) connection status of communication link to be protected between described upstream node and the described downstream node of process, determine whether described communication link to be protected breaks down.
Preferably, described upstream node and described 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.
Described upstream node can be the head node on described main PW, can be also the intermediate node on described main PW; Described downstream node can be the intermediate node on described main PW, can be also the tail node on described main PW.Wherein, the node of the active and standby switching of virtual link that described head node is performing data transmission, described tail node is the node of PW termination, described intermediate node is node described main PW process, between described head node and described tail node.
If the described communication link to be protected of step 202 breaks down; described upstream node carries out the quick heavy-route of TE (Fast Reroute; be designated hereinafter simply as: FRR) switch; by transfer of data be switched in advance set up, for the protection of the label switched path for subsequent use (Label Switched Path, is designated hereinafter simply as: LSP) of communication link to be protected.
After described upstream node detects that described communication link to be protected breaks down, described upstream node carries out TE FRR switching, transfer of data is switched to the LSP for subsequent use setting up in advance, protects described communication link to be protected; Wherein, the described LSP for subsequent use setting up is in advance for the protection of described communication link to be protected.
Preferably, described upstream node can be phy-aware or BFD perception to the testing mechanism of described communication link connection to be protected.Because the communication link between described upstream node and described downstream node connects fairly simple, so detect the speed of described communication link connection, in the time there is link failure, can perceive faster thus, and carry out timely TE FRR switching, make the time of service disconnection very short.
Step 203, described upstream node trigger PW and switch, and transfer of data is switched to the described standby PW for the protection of described main PW from described main PW.
Described L2VPN comprises described main PW and described standby PW, and described standby PW, for described main PW is protected, in the time that the head node of described main PW process is known described main PW link occurs fault, can be switched to described standby PW from described main PW by transfer of data.Preferably, described head node can be upstream boundary router.
Carry out, after described TE FRR switching, triggering described PW and switching at described upstream node; Wherein said upstream node can be the intermediate node on described main PW, can be also the head node on described main PW, in the time that upstream node is dissimilar node, and the mode difference that the described triggering PW of its correspondence switches.
Preferably, in the time that described upstream node is the intermediate node of described main PW process, described upstream node is carrying out after described TE FRR switching, head node to described main PW process sends the Indication message switching for triggering PW, make head node according to described Indication message, carry out PW and take over seamlessly, transfer of data is switched to described standby PW from described main PW.May pass through multiple intermediate nodes at described main PW; the embodiment of the present invention can be applied on arbitrary intermediate node; after arbitrary intermediate node detects that the to be protected communication link corresponding with it breaks down; can first carry out described TE FRR switches; then send the described Indication message for switching to described head node, the PW that makes head node carry out transfer of data switches.
Preferably, in the time that described upstream node is the head node of described main PW process, described upstream node after described TE FRR switches, carries out PW and takes over seamlessly carrying out, and transfer of data is switched to described standby PW from described main PW.
According to the embodiment of the present invention, described upstream node is after detecting that communication link to be protected between described upstream node and downstream node breaks down, first carrying out described TE FRR switches, transfer of data is switched in the LSP for subsequent use setting up in advance, then the PW of trigger data transmission switches, make head node carry out taking over seamlessly of PW, data traffic is switched to described standby PW from described main PW; Due to when the link occurs fault, first carry out localised protection by described TE FRR, and then the PW that carries out transfer of data takes over seamlessly, improve thus the speed of fault detect and flow switch, the service outage duration while having reduced link occurs fault.
The data transmission method for L2VPN that the embodiment of the present invention provides can be applied in user border (Customer Edge, be designated hereinafter simply as: CE) in asymmetric access networking, also can be applied in the symmetrical access of CE networking, below the application in these two kinds of networkings with the specific embodiment explanation embodiment of the present invention respectively.
Fig. 3 is the flow chart of the present invention for the data transmission method embodiment bis-of two-layer virtual private network, Fig. 4 is the schematic diagram of the present invention for the data transmission method embodiment bis-of two-layer virtual private network, the present embodiment is applied in the asymmetric access networking of CE, on the basis of embodiment of the method one, as shown in Figure 3 and Figure 4, described method comprises:
Step 301, between upstream node P1 and downstream node PE2, set up LSP for subsequent use.
In the present embodiment, PE1 is the head node on main PW, and described P1 is the intermediate node being positioned on described main PW, and described PE2 is the tail node on described main PW; P2 is the intermediate node being positioned on standby PW, and PE3 is the tail node being positioned on described standby PW.In the present embodiment, described P1 can be equivalent to the upstream node in embodiment of the method one.
Between described P1 and described PE2, set up Bypass tunnel in advance, for the protection of the communication link to be protected between described P1 and described PE2.
In the asymmetric access networking of described CE, described PE1 is established to the L2VPN of described PE2 and described PE3, and wherein specifying described PE1 is described main PW to the PW of described PE2, and described PE1 is described for PW to the PW of described PE3.PW carries by TE, and the LSP path in the configuration main tunnel of TE is PE1-P1-PE2; And on described P1, set up in advance the Bypass tunnel of TE, and the LSP path in described Bypass tunnel is P1-P2-PE2, LSP for subsequent use path is P1-P2-PE2, for the protection of the link P1-PE2 described to be protected on the main tunnel of TE.Alternatively, in the time setting up described LSP for subsequent use, can use the P2 on described standby PW, also can replace P2 with the node on other any link.
Step 302, detect the connection status of the communication link between described P1 and described PE2 by physical detection or BFD mechanism.
Detect the connection status of the communication link between described P1 and described PE2 by phy-aware or BFD perception.
Step 303, after described P1 breaks down to the communication link of described PE2, described P1 carries out TE FRR switching, and transfer of data is switched to described Bypass tunnel.
When described P1 (local recovery node; PLR) after perceiving described P1 and breaking down to the link of described PE2; described P1 carries out described TE FRR and switches; by extremely described Bypass tunnel of flow switch; to pre-configured LSP described for subsequent use path (P1-P2-PE2), protect described main tunnel with this by flow switch.
Step 304, carry out after described TE FRR switches at described P1, described P1 sends to carry to the head node PE1 of described main PW process and switches Indication message mark, that switch for triggering PW, makes described head node, according to Indication message, transfer of data is switched to described standby PW from described main PW.
Carry out after described TE FRR switching at described P1, described P1 sends and carries path error (PathError) message of switching mark to the described PE1 that is positioned at upstream.
Step 305, described PE1 receive after described Indication message (PathError message), carry out PW and take over seamlessly, and transfer of data is switched to the described standby PW for the protection of described main PW from described main PW.
Described PE1 receives after described PathError message, carries out described PW and takes over seamlessly, and transfer of data is switched to described backup path PE1-P2-PE3 from described main PW.
In step 301-step 305, described P1 is equivalent to the described upstream node in embodiment of the method one, and PE1 is equivalent to the described head node in embodiment of the method one, and PE2 is equivalent to the described tail node in embodiment of the method one.
Alternatively, the described PE1 in the present embodiment also can be equivalent to the upstream node in embodiment of the method one, and in the time that described PE1 is equivalent to the upstream node in embodiment of the method one, the embodiment of the present invention can comprise the following steps:
A, between PE1 and P1, set up for the protection of the Bypass tunnel in the main tunnel of TE in advance, the LSP path in described Bypass tunnel is PE1-P2-P1;
B, detect the connection status of the link between described PE1 and described P1 by physical detection or BFD mechanism, when after the link occurs fault between described PE1 and described P1, described PE1 carries out TE FRR switching, and transfer of data is switched to described Bypass tunnel (PE1-P2-P1);
C, PE1 are carrying out, after described TE FRR switching, transfer of data being switched to described standby PW from described main PW.
The embodiment of the present invention, after the link occurs fault detecting between described PE1 and described P1 or described P1 and described PE2, first carry out TE FRR switching, transfer of data is switched in the LSP for subsequent use setting up in advance, then trigger PW and switch, make described PE1 carry out taking over seamlessly of PW.Due to when the link occurs fault, first carry out localised protection by TE FRR, and then carry out PW and take over seamlessly, improve thus the speed of fault detect and flow switch, the service outage duration while having reduced link occurs fault.
Fig. 5 is the flow chart of the present invention for the data transmission method embodiment tri-of two-layer virtual private network, Fig. 6 is the schematic diagram of the present invention for the data transmission method embodiment tri-of two-layer virtual private network, the present embodiment is applied in the symmetrical access of CE networking, on the basis of embodiment of the method one, as shown in Figure 5 and Figure 6, described method comprises:
Step 501, between upstream node P1 and downstream node PE2, set up LSP for subsequent use.
In the present embodiment, PE1 is the head node on main PW, and described P1 is the intermediate node being positioned on described main PW, and described PE2 is the tail node on described main PW; P2 is the intermediate node being positioned on standby PW.In the present embodiment, described P1 can be equivalent to the upstream node in embodiment of the method one.
Between described P1 and described PE2, set up Bypass tunnel in advance, for the protection of the communication link to be protected between described P1 and described PE2.
In the symmetrical access of CE networking, described PE1 is established to the L2VPN of described PE2, and PW carries by TE, and the LSP path of the traffic engineering tunnel of the described main PW of configuration carrying is PE1-P1-PE2, and the LSP path of carrying the traffic engineering tunnel of described standby PW is PE1-P2-PE2; And on described P1, set up in advance Bypass tunnel, and the LSP path in described Bypass tunnel is P1-P2-PE2, LSP for subsequent use path is P1-P2-PE2, for the protection of the link P1-PE2 to be protected on the main tunnel of TE of described main PW.Alternatively, in the time setting up described LSP for subsequent use, can use the P2 on standby PW, also can replace P2 with the node on other any link.
Step 502, detect the connection status of the communication link between described P1 and described PE2 by physical detection or BFD mechanism.
Detect the connection status of the communication link between described P1 and described PE2 by phy-aware or BFD perception.
Step 503, after described P1 breaks down to the communication link of described PE2, described P1 carries out TE FRR switching, and transfer of data is switched to described Bypass tunnel.
After P1 described in described P1 (PLR) perception road breaks down to the link of described PE2; described P1 carries out described TE FRR and switches; by extremely described Bypass tunnel of flow switch; to pre-configured LSP described for subsequent use path (P1-P2-PE2), protect tunnel with this by flow switch.
Step 504, carry out after described TE FRR switches at described P1; described P1 sends to carry to the head node PE1 of described main PW process and switches Indication message mark, that switch for triggering PW, makes described head node, according to described Indication message, transfer of data is switched to the described standby PW for the protection of described main PW from described main PW.
Carry out after described TE FRR switching at described P1, described P1 sends and carries path error (PathError) message of switching mark to the described PE1 that is positioned at upstream.
Step 505, described PE1 receive after described Indication message (PathError message), notify PW to take over seamlessly, and main PW described in transfer of data is switched to described standby PW.
Described PE1 receives after described PathError message, carries out described PW and takes over seamlessly, and transfer of data is switched to described backup path PE1-P2-PE2 from described main PW.
In step 501-step 505, described P1 is equivalent to the described upstream node in embodiment of the method one, and PE1 is equivalent to the described head node in embodiment of the method one, and PE2 is equivalent to the described tail node in embodiment of the method one.
Alternatively, described PE1 in the present embodiment also can be equivalent to the described upstream node in embodiment of the method one, in the time that described PE1 is equivalent to the described upstream node in embodiment of the method one, the embodiment of the present invention can comprise as the step a-c in embodiment of the method three, not repeat them here.
The embodiment of the present invention, after the link occurs fault detecting between described PE1 and described P1 or described P1 and described PE2, first carry out described TE FRR and switch, transfer of data is switched in the LSP described for subsequent use setting up in advance, then trigger PW and switch, make described PE1 carry out PW and take over seamlessly; Due to when the link occurs fault, first carry out localised protection by described TE FRR, and then carry out described PW and take over seamlessly, improve thus the speed of fault detect and flow switch, the service outage duration while 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 complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, described program, in the time carrying out, is carried out the step that comprises said method embodiment; Aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 7 is the schematic diagram of the present invention for the data transmission device embodiment mono-of two-layer virtual private network, and as shown in Figure 7, described data transmission device comprises: detection module 71, handover module 73 and trigger module 75.
Detection module 71, for detection of the connection status of the communication link to be protected between data transmission device and the downstream node of the main virtual link process with traffic engineering carrying, determines whether described communication link to be protected breaks down.Wherein, in the time that subscriber equipment sends data to described main virtual link, data first arrive described upstream node, the described downstream node of rear arrival.
Handover module 73 is for after determining that when described detection module described communication link to be protected breaks down, carry out the quick heavy-route of traffic engineering and switch, by transfer of data be switched to set up in advance, for the protection of the label switched path for subsequent use of communication link to be protected.
Trigger module 75 switches for carry out triggering virtual link after the quick heavy-route of traffic engineering is switched at described handover module, makes transfer of data be switched to the standby virtual link for the protection of described main virtual link from described main virtual link.
Alternatively, the data transmission device for two-layer virtual private network that the present embodiment provides, can be the intermediate node of described main PW process, can be also the head node of described main PW process.In the present embodiment, the workflow of modules and operation principle, referring to the description in above-mentioned each embodiment of the method, do not repeat them here.
The embodiment of the present invention; after detection module detects that communication link described to be protected between described data transmission device and described downstream node breaks down; described handover module first carries out described TE FRR and switches; transfer of data is switched in the LSP described for subsequent use setting up in advance; then described trigger module triggers PW switching; make head node carry out taking over seamlessly of PW, transfer of data is switched to described standby PW from described main PW.Due to when the link occurs fault, first carry out localised protection by described TE FRR, and then carry out described PW and take over seamlessly, improve thus the speed of fault detect and flow switch, the service outage duration while having reduced link occurs fault.
Fig. 8 is the schematic diagram of the present invention for the data transmission device embodiment bis-of two-layer virtual private network.
Preferably, comprising that on the basis of data transmission device embodiment mono-full content, described data transmission device also comprises: creation module 77.
Described creation module 77, between described data transmission device and described downstream node, is set up label switched path for subsequent use.
Preferably, comprising on the basis of data transmission device embodiment mono-full content, described trigger module 75 comprises: the first trigger element 751 and/or the second trigger element 753.
Described the first trigger element 751 is not in the time that described data transmission device is the head node of described main virtual link process, send to carry to the head node of described main virtual link process and switch Indication message mark, that switch for triggering virtual link, make described head node, according to described Indication message, transfer of data is switched to described standby virtual link from described main virtual link.Preferably, described the first trigger element 751 specifically can be in the time that described data transmission device be the head node of main virtual link process, send to carry to the head node of main virtual link process and switch path error message mark, that switch for triggering virtual link, make head node, according to path error message, transfer of data is switched to described standby virtual link from described main virtual link.
Described the second trigger element 753, in the time that described data transmission device is the head node of described main virtual link process, is carrying out, after the quick heavy-route switching of described traffic engineering, transfer of data being switched to described standby virtual link from described main virtual link.
In data transmission device embodiment mono-, two of the present invention, the node of the active and standby switching of virtual link that described head node is performing data transmission; Described data transmission device and downstream node can be adjacent routing device, and wherein, adjacent routing device refers to 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.
In the present embodiment, the workflow of modules and operation principle, referring to the description in above-mentioned each embodiment of the method, do not repeat them here.
The embodiment of the present invention, after detection module detects that communication link to be protected between described data transmission device and downstream node breaks down, handover module first carries out TE FRR switching, transfer of data is switched in the LSP for subsequent use setting up in advance, then trigger module triggers PW switching, makes head node carry out taking over seamlessly of PW; Due to when the link occurs fault, first carry out localised protection by TE FRR, and then carry out PW and take over seamlessly, improve thus the speed of fault detect and flow switch, the service outage duration while having reduced link occurs fault.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (11)

1. the data transmission method for two-layer virtual private network, be applied in the main virtual link and the standby network of virtual link comprising with traffic engineering carrying, described main virtual link is through a upstream node and a downstream node, wherein, in the time that subscriber equipment sends data to described main virtual link, data first arrive described upstream node, the described downstream node of rear arrival, it is characterized in that, described method comprises:
Described upstream node detects the connection status of the communication link to be protected between described upstream node and downstream node, determines whether described communication link to be protected breaks down;
If described communication link to be protected breaks down, described upstream node carries out the quick heavy-route of traffic engineering and switches, by transfer of data be switched to set up in advance, for the protection of the label switched path for subsequent use of described communication link to be protected;
Described upstream node triggers virtual link and switches, and transfer of data is switched to the standby virtual link for the protection of described main virtual link from described main virtual link.
2. the data transmission method for two-layer virtual private network according to claim 1; it is characterized in that; described upstream node triggers virtual link and switches, and transfer of data is switched to for the protection of the standby virtual link of described main virtual link and is comprised from described main virtual link:
Described upstream node sends and carries the Indication message that switches mark, switches for triggering virtual link to the head node of described main virtual link process, makes described head node, according to described Indication message, transfer of data is switched to described standby virtual link from described main virtual link;
Described head node is the node of the active and standby switching of virtual link of performing data transmission.
3. the data transmission method for two-layer virtual private network according to claim 2, is characterized in that, described Indication message is path error message.
4. the data transmission method for two-layer virtual private network according to claim 1; it is characterized in that; described upstream node triggers virtual link and switches, and transfer of data is switched to for the protection of the standby virtual link of described main virtual link and is comprised from described main virtual link:
Described upstream node is carrying out, after the quick heavy-route switching of described traffic engineering, transfer of data being switched to described standby virtual link from described main virtual link;
Described upstream node is the node of the active and standby switching of virtual link of performing data transmission.
5. according to the arbitrary described data transmission method for two-layer virtual private network of claim 1-4, it is characterized in that, set up in the following manner the label switched path for subsequent use for the protection of described communication link to be protected:
Between described upstream node and described downstream node, set up described label switched path for subsequent use.
6. according to the arbitrary described data transmission method for two-layer virtual private network of claim 1-4, it is characterized in that, described upstream node and described downstream node are adjacent routing device.
7. for a data transmission device for two-layer virtual private network, it is characterized in that, comprising:
Detection module, for detection of the connection status of the communication link to be protected between described data transmission device and the downstream node of the main virtual link process with traffic engineering carrying, determine whether described communication link to be protected breaks down, wherein, in the time that subscriber equipment sends data to described main virtual link, data first arrive described data transmission device node, the described downstream node of rear arrival;
Handover module, for after described detection module determines that described communication link to be protected breaks down, carry out the quick heavy-route of traffic engineering and switch, by transfer of data be switched to set up in advance, for the protection of the label switched path for subsequent use of described communication link to be protected;
Trigger module, switches for carry out triggering virtual link after the quick heavy-route of traffic engineering is switched at described handover module, and transfer of data is switched to the standby virtual link for the protection of described main virtual link from described main virtual link.
8. the data transmission device for two-layer virtual private network according to claim 7, is characterized in that, described trigger module comprises:
The first trigger element, for in the time that described data transmission device is not the head node of described main virtual link process, send and carry the Indication message that switches mark, switches for triggering virtual link to the head node of described main virtual link process, make described head node, according to described Indication message, transfer of data is switched to described standby virtual link from described main virtual link; And/or
The second trigger element, in the time that described data transmission device is the head node of described main virtual link process, is carrying out, after the quick heavy-route switching of described traffic engineering, transfer of data being switched to described standby virtual link from described main virtual link;
Described head node is the node of the active and standby switching of virtual link of performing data transmission.
9. the data transmission device for two-layer virtual private network according to claim 8, it is characterized in that, described the first trigger element specifically for: in the time that described data transmission device is not the head node of described main virtual link process, send and carry the path error message of switching mark, switching for triggering virtual link to the head node of described main virtual link process, make described head node, according to described path error message, transfer of data is switched to described standby virtual link from described main virtual link.
10. according to the arbitrary described data transmission device for two-layer virtual private network of claim 7-9, it is characterized in that, also comprise:
Creation module, between described data transmission device and described downstream node, sets up described label switched path for subsequent use.
11. according to the arbitrary described data transmission device for two-layer virtual private network of claim 7-9, it is characterized in that, described data transmission device and described downstream node are adjacent routing device.
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