WO2009062420A1 - Method, system and device for forwarding the data frames - Google Patents

Method, system and device for forwarding the data frames Download PDF

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Publication number
WO2009062420A1
WO2009062420A1 PCT/CN2008/072154 CN2008072154W WO2009062420A1 WO 2009062420 A1 WO2009062420 A1 WO 2009062420A1 CN 2008072154 W CN2008072154 W CN 2008072154W WO 2009062420 A1 WO2009062420 A1 WO 2009062420A1
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WO
WIPO (PCT)
Prior art keywords
tunnel
forwarding
segment
device
data frame
Prior art date
Application number
PCT/CN2008/072154
Other languages
French (fr)
Chinese (zh)
Inventor
Li XUE
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN200710169426 priority Critical
Priority to CN200710169426.X priority
Priority to CN200710194555.4 priority
Priority to CN2007101945554A priority patent/CN101436976B/en
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009062420A1 publication Critical patent/WO2009062420A1/en
Priority claimed from US12/778,191 external-priority patent/US20100284270A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/46Interconnection of networks
    • H04L12/4633Interconnection of networks using encapsulation techniques, e.g. tunneling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/22Alternate routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/28Route fault recovery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2212/00Encapsulation of packets

Abstract

A method, a system, and a device for forwarding the data frames, belong to the field of communication. The method includes the following steps. When a failure occurs in a part of tunnel of a working tunnel, an upper nearend device (401) of the failure part receives the data frames, then starts a segment protection tunnel. The original node of the segment protection tunnel is the upper nearend device (401), the terminal node of the segment protection tunnel is a lower nearend device (402). The data frames are forwarded to the lower nearend device (402) through the segment protection tunnel, and forwarded to a destination device through a non-failure part of the working tunnel by the lower nearend device (402). The system includes the upper nearend device (401) and the lower nearend device (402). The method, system and device provide the segment protection for PBB TE tunnel. When a failure occurs in the working tunnel, it replaces the failure part of the working tunnel with the segment protection tunnel, and utilizes the non-failure part of the working tunnel subsequently. Therefore it utilizes the network resources efficiently, avoids the waste of the network broadband, and provides multiple modes of the failure protection for the operator.

Description

A method of forwarding data frames, the systems and techniques FIELD

The present invention relates to the field of communications, and particularly relates to a method for forwarding data frames, the system and apparatus. Background technique

Ethernet technology as a next generation network bearer network technology, with low cost, simple, easy to upgrade, etc., from a single Ethernet network hierarchy towards said connection-oriented and the direction of development, formed by the current hierarchical Ethernet ho . In the development process, resulting in PBB TE (Provider Backbone Bridge Traffic Engineer, Provider Backbone Traffic Engineering), namely PBT (Provider Backbone Transport, provider backbone transport) technology.

PBB TE implements Ethernet connection-oriented characteristics, the book is an Ethernet network standard derivative technology, it closed the spanning tree, traditional Ethernet flooding mechanism and broadcast mechanisms to provide various services through the establishment of a tunnel in the bone Ding network . PBB TE in the MAC (Media Access Control, MAC) in MAC technology on the basis of developed. MAC in MAC technique utilizes encapsulated MAC address of operator user MAC address, and isolating the purpose of reducing the MAC address during data transmission. MAC in MAC technology hierarchical network, e.g., network hierarchized into three layers, a network layer, respectively, for the user, the provider network layer and the network layer of each backbone connection provider's network. Referring to Figure 1 a prior art provided for the MAC in MAC network connection diagram. A user network connection comprises a network layer, network layer and suppliers backbone network layer. DETAILED by CBN (Customer Bridged Network, the user of a bridged network) network layer user X and the Y formed of CBN, PBBN (Provider Backbone Bridged Network, provider backbone bridged network will be ten), and X by the connecting layer and CBN PBBN of PBN (provider Bridged network, suppliers of a bridged network) provider network layer connection CBN Y and X and the PBBN PBN Y configuration.

PBB TE tunnel is established by PBBN network, forwarding complete MAC data double frame address. Wherein, by the B - B-DA (Backbone Destination Address, the backbone destination address) the TAG (label) + B- VID (Backbone Virtual Local Area Network ID, virtual backbone network identifier) ​​to identify the tunnel, the tunnel PBB TE only identified B-TAG, user information is transparent. Technical PBB TE data frame connection-oriented service, through the outer TAG (B-TAG) + B-DA work on the establishment of the tunnel and the tunnel, establishing the number of backup tunnel network configuration according to the actual needs, different the B-VID identifying work to achieve the tunnel between the <B-SA (backbone source address, backbone source address), B-DA (backbone Destionation Adress, the backbone destination address)> and the backup tunnel distinction. Referring to Figure 2, the prior art provides for PBB TE tunnel connection diagram. Between B-SA and B-DA1 are forwarded by the tunnel work B-VID1 identification data frames, between B-SA and B-DA2 forwarding data frames through the working B-VID1 tunnel identity and B arranged for tunneling work -VID2 backup tunnel identifier of the backup tunnel provides protection for the working end of the tunnel between the B-SA and the B-DA2; B-SA, and between the B-DA3 through the data forwarding tunnel work frame identifier B-VID1 . In PBBN network, the tunnel between the working B-SA and the B-DA1 with B-DA1 + B-VID1 identifier; B-SA and the B-DA2 tunnel work with B-DA2 + B-VID1 identifier, backup tunnels B-DA2 + B-VID2 identifier; tunnel between the B-SA and the B-DA3 with B-DA3 + B-VID1 identification. PBB TE tunnels to different B-DA, B-VID can be reused, but to ensure that a combination of B-DA + B-VID unique, PBB TE provides a good foundation for the expansion of the network in PBBN whole network.

Normally, data transmission traffic B-SA, i.e., the data frame is transmitted to the B-DA through the working tunnel, the tunnel work when a failure occurs, the backup tunnels pre-configured to enable the transmission of data traffic is switched B-SA to the backup tunnel, data traffic sent through the tunnel to the backup B-DA, complete protection switching. The protection provided carrier-class end to end protection between B-SA and the B-DA switching to. 3, PPB TE prior art to provide end to end protection see diagram. When the working tunnel B-SA and the B-DA2 B-VID1 identification fails, the data frames sent B_SA switch to the backup tunnel configured identified in B-VID2, PBBN in the network, the backup tunnel B-DA2 + B-VID2 identify the data transmitted through the backup tunnel to the B-DA2, protection switching is completed, the PPB TE-end protection.

In the process of implementing the present invention found that although the PRR TE technology provides end-to-telecom-class protection, but at least the following shortcomings and deficiencies:

Existing PBB TE only provides end-to-protection technology, without regard to the overall resources of the working tunnel configuration. As long as the small tunnel fails, whether it is equipment failure or link failure, whether it is a single failure or multiple failures, will discard the entire tunnel work, and enable the entire backup tunnel, resulted in the rational use of network resources, resulting in waste of network bandwidth. SUMMARY

For rational use of network resources, embodiments of the present invention provides a method of forwarding data frames, the system and apparatus. The technical solutions are as follows:

A method of forwarding data frames, the method comprising:

When operating in the tunnel section LSP fails, the upstream portion of the near-end device receives the failure data frame start segment protection tunnel, the tunnel segment protection is the start node upstream end device, terminal node downstream of the near-end device is part of the fault;

The protection tunnel to forward the data frame to the device through the proximal end of the downstream segment;

The proximal end of the device via the downstream forwarded to the destination device through a portion of the fault-free working of the tunnel.

Embodiments of the invention also provides a system for forwarding data frames, the system comprising:

Upstream of the near-end device, when the working tunnel is faulty, the fault is located upstream of a proximal end for activating segment protection tunnel to the tunnel segment protection transmitting a data frame, the proximal end of the device is the upstream segment protection the starting node of the tunnel; downstream proximal end of the device, when the working tunnel is faulty, the fault is located downstream of the proximal end, for receiving the segment protection tunnel to forward data frame, the data frame tunnel through the working no defective part is forwarded to the destination device, the device is downstream of the proximal segment protection tunnel endpoint node.

Embodiments of the present invention further provides an apparatus upstream proximal end, the proximal end of an upstream apparatus comprising:

Receiving means for receiving a data frame;

Starting module for, when the working LSP fails, start segment protection tunnel;

Forwarding module, configured to start a data frame to the segments of the protected starting module forwarding tunnel to the receiving module.

Embodiments of the present invention further provides an apparatus downstream of the proximal end, the proximal end of the downstream apparatus comprising:

Receiving means for receiving a data frame;

Modification module for, when the working LSP fails, modifying the receiving module receives the data frame; forwarding module, for the data modification module modifying the frame through the working portion of the tunnel forwarded to the destination without failure equipment.

Advantageous effects of the technical solutions provided in the embodiments of the present invention is:

By providing a protection tunnel to the working tunnel sections, when a partial failure of the tunnel in tunnel work, instead of using the segment protection tunnel small for the failure of the part of the tunnel, the tunnel bypassing the defective part D as in the data frame transmission process is continued work trouble-free use of the tunnel section, then effective and rational use of network resources and avoid waste of network bandwidth, it offers a variety of fail-safe way for operators. BRIEF DESCRIPTION

FIG. 1 is a prior art MAC in MAC network providing connection diagram;

FIG 2 is a prior art PBB TE tunnel connection provides a schematic view;

3 is a schematic end PPB TE prior art to provide protected;

FIG 4 is a schematic diagram of a network forwarding data provided in Example 1 of the embodiment of the present invention, a frame;

5 is a flowchart for forwarding data provided in an embodiment of the method of the present invention, a frame;

FIG 6 is a schematic view of a network for forwarding data provided in Example 2 of the embodiment of the present invention, a frame;

FIG. 7 is a method for forwarding data provided in Example 2 of the embodiment of the present invention, a frame flowchart;

FIG 8 is a schematic view of a network for forwarding data provided in Example 3 of the embodiment of the present invention, a frame;

9 is a method for forwarding data provided in Example 3 of the embodiment of the present invention, a frame flowchart;

FIG 10 is a schematic view of a system for forwarding data frames provided in Example 4 of the present invention; FIG. 11 is a detailed schematic diagram of a first system frame forwarding data provided in Example 4 of the embodiment of the present invention;

FIG 12 is a detailed schematic diagram of a second system frame forwarding data provided in Example 4 of the embodiment of the present invention;

FIG 13 is a detailed schematic diagram of a second embodiment 4 forwards the data frame to provide a system embodiment of the present invention;

FIG 14 is a schematic diagram of another embodiment of a frame forwarding system 4 provided by the embodiment of the present invention;

FIG 15 is a schematic upstream end device provided in Example 5 of the present invention;

FIG 16 is a detailed schematic diagram of a first embodiment of the device 5 provided upstream of the proximal end of the embodiment of the present invention;

FIG 17 is a detailed schematic diagram of a second embodiment of the device 5 provided upstream of the proximal end of the embodiment of the present invention;

FIG 18 is a detailed schematic diagram of a third embodiment of the device 5 provided upstream of the proximal end of the embodiment of the present invention;

FIG 19 is a schematic view of the proximal end of the downstream device provided in Example 6 of the present embodiment of the invention. detailed description

To make the objectives, technical solutions, and advantages of the present invention will become apparent in conjunction with the following drawings, embodiments of the present invention will be described in detail a ho into place.

Embodiment of the present invention provides a method of forwarding data frames, the method comprising:

When operating in the tunnel section LSP fails, the upstream portion of the near-end device receives the failure data frame start segment protection tunnel; wherein the protection tunnel segment start node is an upstream proximal end of the device, end node is a proximal portion downstream equipment failure; data frame segments of the protected tunnel through the proximal end of the device is forwarded to the downstream; forwarded part of the work by a fault-free tunnel to the destination device over the proximal end of the downstream equipment. Example 1

Embodiment of the present invention provides a method of forwarding data frames, the network structure 4 provides a schematic diagram see FIG, wherein the source apparatus S to the destination device D transmits a data frame, the data frame carries the B-VID1 identifier, which indicates the data frames to be forwarded through the tunnel work identified B-VID1 to between devices a and C fails (wherein, between the forwarding device failure such as link failure or a device failure Λ C device, etc.) Examples will be described, referring to Figure 5, the present embodiment is enabled to segment protection device upstream proximal part of the fault forwarding, pause mode using the fault-free forwarding table, it forwards the data frame over the protection tunnel segment corresponding to the defective part, comprises ho the following step:

Ho step 101: When the B-VID1 tunnel identification fails, the proximal end of the device A notifies the upstream and downstream equipment failure proximal portion (:.

When a failure occurs, the PBBN network using CFM (Connect ivi ty Fault Management, Connectivity Fault Management) / 0AM (Operat ion, Admini strat i on and Maintenance, ¾f> Administration and Maintenance) sending a failure message to inform the upstream proximal end a proximal end of the device and a downstream device (: wherein, in the present embodiment, only an example that a link failure, however, those of ordinary skill in the art may know, application of the embodiment of the present invention is not limited to equipment failure or a chain circuit fault, and the fault can be points of failure, may be multiple points of failure.

Ho step 102: the upstream proximal end of the apparatus A after receiving the notification, forwarding segment protection is enabled, forwarding suspended without failure. In operation trouble-free tunnel, in Table 1, the proximal end of the device upstream of the fault-free A forwarding table, forwarding to a fault-free prior art, will not be repeated. See Table 2, the proximal end of the upstream segment protection apparatus A forwarding table. In PBBN network, PBB TE collected according to the network planning needs or signaling network resources, is calculated as part of link or device preset segment protection tunnel tunnel prone to failure through static configuration or signaling, and to upstream of the proximal end portion of working equipment failure to establish the tunnel segment protection for identifying segments of the protected tunnel forwarding.

Wherein the static configuration can be statically configured by the NMS or calculated by PCE (Path Computation Element, PCE) statically configured path, or by other prior art completion of the tunnel can be configured to implement static functions; signaling can be calculated by GMPLS (Generalized multiprotocol Label switching, Generalized multiprotocol Label switching protocol) signaling or signaling calculated by computing FRR (fast route Recovery, fast reroute techniques), or by other prior art to complete the backup tunnel established signaling technology.

In establishing the segment protection forwarding table, field table and set in the same trouble-free forwarding table of the field, including the destination address, B-VID identifier, export. Only when the upstream end device A receives the failure notification, will enable the forwarding segment protection, while the segment protection is enabled forwarding table, suspended trouble forwarding, the forwarding segment protection enabled, you can the destination address and B-VID identifier carried in the data frame segment protection forwarding table queries corresponding to an outlet corresponding to the upstream proximal end of the tunnel segment protection apparatus a pre-configured; as shown in table 2, by D and the destination address identifies the B-VID1 to the outlet 3 can be found. When the defective part back to normal notification received within a preset time, the segment will be suspended to protect the forwarding table, and re-enable trouble-free forwarding; when the fault has not received part of the preset time return to normal notification, forwarding segment protection will be temporarily suspended, will re-enable the trouble-free and fault-free forwarding forwarding table D and a destination address corresponding to the identifier B-VID1 outlet replace segment protection forwarding table corresponding to the outlet, table about to exit the field 1 corresponding to "1", is replaced in table 2 corresponding to the field "3."

Table 1

B-VID identifies the destination address of the outlet

D B-VID1 1

... ... ...

Table 2

B-VID identifies the destination address of the outlet

D B-VID1 3

... ... ... ho step 103: A near-end device receives the upstream data frame sent by the source device S, acquires identification data frame carries the working tunnel, i.e., B-VID1, lookup segment based on the work tunnel identifier B-VID1 protection forwarding table to find the corresponding data frame forwarding export, export start forwarding corresponding segment protection tunnel.

Exit signs segment protection forwarding table corresponding to the predetermined segment protection tunnel. Segment protection tunnel, there may be a forwarding device B, wherein B in the repeater device itself forwarding table entries is calculated through static configuration or signaling protection tunnel established for identifying a segment of rotation, with the forwarding entries representing the forwarding device B receives the data frame from the protection tunnel segment, forwarding to a downstream device through which the proximal end of the outlet itself.

Ho step 104: after receiving the downstream end device C from the data frame tunnel segment protection, forwards the frame 0 data to the destination device.

Into a ho, embodiments of the present invention further provides a fault by determining whether the working part of the tunnel restored within a preset time, to decide whether to form a new tunnel work, in particular ho step of:

Ho step 105: judging within a preset time the tunnel work defective part is back to normal, if yes, performing step ho

106; otherwise, step 107 ho.

A upstream end device over a network fault detection mechanism to determine whether a failure as part of the tunnel butoxy stop recovery: constant. For example, detecting periodically transmitted packets is determined by receiving a failure detection mechanism which detects whether a failure message carries a normal part of the work of the tunnel information.

Ho step 106: the upstream proximal end of the apparatus A itself enable trouble-free forwarding, pause segment protection forwarding table, by searching its own fault-free data frame forwarding outlet corresponding to the B-VID1 forwarding received. That is good work to restore the use of forward repair of defective parts tunnel data frame ends.

Ho step 107: the upstream proximal end of the apparatus A itself enable trouble-free forwarding, forwarding suspended segment protection, and

B-VID1 identified in the fault-free forwarding table corresponding outlet trouble identifying alternative portions of the outlet segment identified in the forwarding table, i.e., the protective segment B-VID1 tunnel and the tunnel formed work identified a new tunnel work, end .

Embodiment of the present invention at work on the tunnel failure, equipment failure proximal portion upstream segment protection enable forwarding by forwarding lookup segment protection obtained according to the ID outlet of the received data frame carries the working tunnel, with the corresponding segments of the protected tunnel outlet replacement of defective parts of the original working tunnel occurs, failure to complete the engagement portion of the free segment protection tunnel and the tunnel work, the work passes a data frame transmitted by the tunnel source device D S to the destination device, about failure to open part of the work of the tunnel, the tunnel can continue to use the original work trouble-free part of the transponder data frame. Avoids the data frame transmission process, ώ part failures in tunnel work and discarding the entire tunnel, to achieve the tunnel segment protection, efficient use of network resources, reduce the waste of network bandwidth. Example 2

Embodiment of the present invention provides a method of forwarding data frames, see FIG. 6 a schematic view of a network structure provided, wherein the source apparatus S to the destination device D transmits a data frame, the data frame carries the B-VID identifier, which indicates the data a frame to be performed by the working B-VID identifies the tunnel forwarding to between devices a and C fails, for example, see FIG. 7, in the present embodiment an upstream portion and a proximal downstream equipment failure device modifies the data frames proximal Example identification embodiment of the tunnel, forwarding data frames through the protective segment portion corresponding to the tunnel fails, ho step specifically includes the following:

Ho step 201: when the working B-VID tunnel identification fails, the proximal end of the device A notifies the upstream and downstream equipment failure proximal portion (.

Ho step 202: A upstream end device after receiving the notification, the destination address carried in the data frame, a destination address lookup identifies the corresponding segment protection tunnel PB-VID, the data frame tunnel identifier carried in the work B -VID modified to identify the found segment protection tunnel PB-VID, segments of the protected tunnel through PB-VID identifies the forwarding.

Wherein the proximal end of the device A is provided with an upstream forwarding table, the forwarding table comprises a destination address field, and an outlet segment protection tunnel identifier, to find the forwarding destination address in accordance with segment protection and data frame tunnel identifier carried in the PB-VID published can be found in the corresponding export, namely PR-VTD identify the corresponding segment protection tunnel.

Segment protection tunnel, there may be a forwarding device B, which establishes the identity of the forwarding device B segment protection tunnel forwarding table entries for static configuration or signaling calculated, the forwarding entry for indicating the forwarding device B receives after the segments of the protected tunnel from the data frames, is forwarded to BU tour through the proximal end of the device itself to which the U.

Ho step 203: the proximal end of the device C receives a downstream data frame segments of the protected tunnel from the PB-VID identifier forwarded, a data frame carried in PB-VID identifies modify B-VID identifier, B-VID identifier lookup operation tunnel the data frame by looking for fault-free part of the work to the B-VID tunnel identifier forwarded to the destination device D.

Into a ho, embodiments of the present invention further provides a fault by determining whether the working part of the tunnel restored within a preset time, to decide whether to form a new tunnel work, in particular ho step of:

Ho step 204: determining whether a preset time working tunnel fails partially restored to normal, if yes, performing step 205 ho; otherwise, step 206 ho.

Ho step 205: Enable Fault portion reconditioned tunnel work, the source device S transmits a data frame tunnel work reconditioned by 0 to a destination device, is ended.

Ho step 206: modifying by the upstream proximal end of the device 4, the proximal end of the device C, and the downstream segment protection device B forwarded its own tunnel forwarding table, so that segments of the protected tunnel work and trouble-free portion of the tunnel formed of new tunnel work, End.

Wherein the tunnel segment protection device by forwarding tunnel identifier of the segment protection PB-VID correspondingly modified to work tunnel identifier B-VID, so that fault-free working of the tunnel portion and segment protection tunnel established a new tunnel work. New working tunnel may use the original working B-VID tunnel or other B-VID identified. After the formation of the new tunnel work, the upstream and downstream of the apparatus A proximal end of the proximal end of the device C will not receive the data frame abutment carries an identifier to be modified.

Embodiment of the present invention at work on the tunnel fails, the upstream end device identification data received defective part abutting the frames carrying the working tunnel modify lookup segment protection tunnel, to replace the original lookup segment protection tunnel the occurrence of defective parts work in the tunnel. Avoids the data frame transmission process, because some failures of the tunnel, while discarding the entire tunnel work, to achieve the tunnel segment protection, efficient use of network resources, reduce the waste of network bandwidth. Example 3

Embodiment of the present invention provides a method of forwarding data frames, see FIG. 8 a schematic view of a network structure provided, wherein the source apparatus S to the destination device D transmits a data frame, the data frame carries the B-VID identifier, which indicates the data a frame to be performed by the working B-VID identifies the tunnel forwarding to between devices a and C fails, for example, see FIG. 9, in the present embodiment, the upstream and downstream end device proximal portion to equipment failure the data frame, respectively way of encapsulation and decapsulation, forwarding data frame tunnel through the protective segment portion corresponding to the fault, ho step specifically includes the following:

Ho step 301: when the working B-VID tunnel identification fails, the proximal end of the device A notifies the upstream and downstream equipment failure proximal portion C.

Ho step 302: A data upstream end device after receiving the notification, the received source device S ώ frame transmitted using encapsulated packaging labels.

Wherein the data source device S sends frames to MAC in MAC frame, a data frame carries a destination address B_DA (D), data frame encapsulated obtained carries circumvent the address information of part of the fault, the address information specific to the failure part of the work tunnel the proximal end of the apparatus downstream of the destination address C B-DA (C).

Ho step 303: Find an upstream proximal segment A protection device according to the tunnel enclosure label, to the search start segment protection tunnel, the encapsulated data frame is forwarded through the found segment protection tunnel device B downstream of the proximal end of the device C.

Ho step 304: the downstream end device C receives the data from the segments of the protected tunnel encapsulation frame, a data frame decapsulating defective part is removed to circumvent the address information carried in the data frame, through the work portion forwarded to the tunnel without failure the destination device D.

The method of forwarding data frames provided by the embodiment of the present invention, in receiving the data frame encapsulation, and the found segment frame portion protection fault occurs alternative work tunnel through the tunnel encapsulated data, so the data source device to the frame when the transmission destination device, bypassing the part of the failure of the tunnel work, we can continue to use the original tunnel work trouble-free part of the transponder data frame.

Into a ho, embodiments of the present invention further provides a fault by determining whether the working part of the tunnel restored within a preset time, to decide whether to form a new work process the tunnel. Ho step is specifically:

Ho step 305: determining whether a preset time working tunnel fails partially restored to normal, if yes, performing step 306 ho; otherwise, step 307 ho.

Ho step 306: Enable Fault portion reconditioned tunnel work, the source device S transmits a data frame tunnel work reconditioned by 0 to a destination device, is ended.

Ho step 307: the upstream end device A and segment protection tunnel forwarding device B via address learning, forwarding modifies itself, so that segments of the protected tunnel work and trouble-free portion of the tunnel formed of new work tunnel end.

Segment protection device on the tunnel forwarding device B comprises an upstream segment and the proximal end of the protection apparatus A tunnel through address learning, forwarding modifies itself. A proximal end of the device upstream of the entry added to reach the destination device D, and the outlet of the table entry is consistent with the entry for reaching the outlet segment protection device C through the tunnel, the upstream proximal end of the device A to delete the original destination device D table entry, and the entry to the destination device to increase D in a forwarding device B, the entry for reaching the outlet ¾ entry coincides outlet device C through the protection tunnel segment. Thereby, the segments of the protected tunnel work and trouble-free tunnel portion formed tunnel a new work.

After which, the formation of new small for the tunnel, ώ the device on the segments of the protected tunnel for forwarding itself has been modified, the upstream proximal end of the device is no longer Α received data frame encapsulation, tunnel trouble-free work the protective segment portion of a new tunnel established tunnel work, new working B-VID tunnel can use the original working tunnel identifier, B-VID or other identification.

Embodiment of the present invention at work on the tunnel fails, the data device docking fault upstream proximal part of the encapsulated frame received destination address to circumvent part of the fault, the protection tunnel lookup segment, the segment is replaced with the found protection tunnel part of the original failure occurred in tunnel work. Avoids the data frame transmission process, A is working in the partial failure of the tunnel, while discarding the entire tunnel work, to achieve the tunnel segment protection, efficient use of network resources, reduce the waste of network bandwidth. Example 4

Referring to Figure 10, a schematic diagram of the present system is provided for forwarding data frames embodiment of the invention. Embodiment of the present invention provides a kind of forwarding data frames, comprising:

Upstream of the proximal end of device 401, when the working LSP fails, located upstream of the proximal end of the fault, for starting the tunnel segment protection, the protection tunnel to transmit the data frame segments, the upstream proximal end of device 401 is protected by a tunnel segment start node;

Downstream of the near-end device 402, when the working tunnel is faulty, the fault is located downstream of the proximal end for receiving the segments of the protected tunnel forwarding data frames, the data frame is forwarded to the destination device via the fault-free part of the work of the tunnel, downstream of the proximal end segment protection device 402 is a terminal node of the tunnel. When the working tunnel fails, the PBBN network using CFM / 0AM sending a failure message to notify the upstream device 401 and the proximal end of the proximal end of the downstream portion of the apparatus 402 malfunction.

When the working LSP fails, for example corresponding to the method embodiments, system in the embodiment of the present invention to achieve the following ways to provide protection tunnel segment:

(1) forwarding is enabled by the protective segment, and then obtain the segment protection tunnel, replacement of the defective part of the work to achieve the tunnel segment protection tunnel, In this case, referring to FIG. 11, system 401 upstream of the proximal end of the device comprises:

A receiving module 4011 for receiving data frames;

A switching module 4012, is used when the working portion of the tunnel LSP fails, to enable its own segment protection forwarding table, forwarding suspended without failure;

Obtaining module 4013, configured to obtain identification data receiving module 4011 receives the frame work of the tunnel; Find initiation module 4014, an obtaining module 4013 according to the acquired identifier of the tunnel work, the protection switching module 4012 in segmentation turn enabled table lookup identifies the corresponding working tunnel exit signs, exit signs started corresponding segment protection tunnel;

Forwarding module 4015, and for forwarding the data frame tunnel segment protection start module 4014 starts by looking. (2) forwarding the data by looking up a destination address carried in the frame, to find the identity of the segment corresponding to the protection tunnel, and the corresponding outlet, i.e. to find the corresponding segment identification protection tunnel segment protection tunnel, and the data frame small for the tunnel identifier carried in the protective segment is modified to identify the tunnel to achieve part of fault segments of the protected tunnel for tunneling butoxy Alternatively, at this time, referring to FIG. 12, the proximal end of the device upstream of the system 401 may include:

A receiving module 4016 for receiving data frames;

Modification module 4017, a tunnel when the working portion of the tunnel fails, acquiring identification data frame received by the receiving module 4016 carried segment protection tunnel destination address corresponding to the identification data frame modified to work in tunnel identifying segments of the protected tunnel;

Find initiation module 4018, used to find the corresponding segments of the protected tunnel forwarding table according to the destination address of the data frame after modification module 4017 to modify the identification and protection tunnel segment, segment start protection tunnel;

Forwarding module 4019, for the start segment protection tunnel forwarding module 4018 starts by looking modify module

4017 modified data frame;

Accordingly, the apparatus 402 comprises a proximal end downstream:

A receiving module 4021 for receiving data frames;

Modification module 4022, a receiving module configured to identify segments of the protected tunnel 4021 in the received data frame is modified to work tunnel identifier;

Forwarding module 4023, a module 4022 to modify the modified data frame portion forwarded to the destination device failure through the tunnel without work.

(3) by using the address information to circumvent the fault data frame encapsulation portion, thereby obtaining segment protection tunnel to achieve part of the replacement work fault protection tunnel tunnel segment, this time, referring to Figure 13, the proximal end of the device upstream of the system 401 may be embodied include:

40110 receiving module configured to receive the data frame;

Encapsulation module 40111, when used for work in the tunnel portion LSP fails, the package receiving module 40110 received data frame, the data frame encapsulation carries the address information of the defective part to circumvent the work tunnel;

Find starting module 40112, according to the address information of the data packaging module encapsulating the frame 40111 carried avoid defective part lookup segment protection tunnel, starts to find the segments of the protected tunnel;

Forwarding module 40113, the tunnel for the segments of the protected starting module 40112 forwards the encapsulated initiated lookup module

40111 encapsulated data frames;

Accordingly, the apparatus 402 comprises a proximal end downstream:

A receiving module 4024 for receiving data frames;

Decapsulating the data module 4025, a receiving module 4024 decapsulates the received frame is removed to circumvent the failure address information portion of the data frame carries;

Forwarding module 4026, the data for the decapsulated frame decapsulating module 4025 forwards the failure part by the destination device without the tunnel work.

Into a ho, referring to FIG 14, a frame forwarding system according to an embodiment of the present invention further comprises:

The intermediate device 403, when the working LSP fails, the tunnel is located in the protective segment, for receiving an upstream data frame sent by the proximal end 401, and forwards the data frame to a downstream proximal end of the device 402. Wherein the intermediate device 403 may be a multiple, correspondingly, the specific segments of the protected tunnel by the communication link between each of the intermediate devices 403 and 403 constitute a plurality of intermediate devices.

Embodiments of the present invention at work on the tunnel fails, replacing the original work by a tunnel segment partially fails protection tunnel. It avoids the data frame transmission process, the portion failures mountain tunnel, while discarding the entire tunnel work, to achieve the tunnel segment protection, efficient use of network resources, reduce the waste of network bandwidth, and operators It offers a variety of fail-safe way. Example 5

Referring to FIG 15, embodiments of the present invention provides a kind of an upstream-end device, the apparatus comprising:

The receiving module 501 for receiving data frames;

Starting module 502, configured to, when the working LSP fails, start segment protection tunnel; forwarding module 503 for initiating the startup module 502 segments of the protected tunnel forwarding data frames received by the receiving module 501.

When the working LSP fails, for example corresponding to the method embodiments, system in the embodiment of the present invention to achieve the following ways to provide protection tunnel segment:

(1) forwarding is enabled by the protective segment, and then obtain the segment protection tunnel, replacement of the defective part of the work to achieve the tunnel segment protection tunnel, In this case, referring to FIG. 16, the proximal end of the device upstream of the start module 502 specifically comprises:

A switching unit 5021 for, when the working portion of the tunnel LSP fails, to enable its own segment protection forwarding table, forwarding suspended without failure;

Obtaining unit 5022, configured to obtain identification data receiving module 501 receives the frame work of the tunnel; Locate the initiating unit 5023, according to the working tunnel obtaining unit 5022 acquires the identity of the switching unit

5021 enabled the segment protection forwarding table lookup identifies the corresponding working tunnel exit signs, exit signs started corresponding segment protection tunnel.

Ho into a forwarding module 503 is provided upstream of the proximal end of the apparatus according to the present embodiment of the invention, further comprising:

Determining unit 5031, configured to determine whether a fault recovery portion stops within a preset time: constant;

Forwarding a first switching unit 5032, when the judging unit 5031 determines a result of part failure during normal, trouble-free to enable its forwarding table, forwarding suspended segment protection;

Wu second forwarding switching unit 5033, when it is determined by ten single Wu 5031 the determination result is returned to normal non-defective part, to enable trouble-forwarding, pause segment protection forwarding table, and forwarding enable fault-free working identify a tunnel identifier corresponding outlet replace segment protection forwarding table corresponding to the exit sign.

In this manner, when the working LSP fails, the proximal end of the upstream segment protection device enables forwarding, forwarding lookup segment protection obtained according to the ID outlet of the received data frame carries the work through the tunnel, with the corresponding outlet Alternatively the original work protection tunnel segment tunnel section fails to complete the convergence segments of the protected tunnel and the tunnel working part of the fault-free, to avoid the data frame transmission process, because some failures of the tunnel, while discarding the entire tunnel work, to achieve a tunnel segment protection, efficient use of network resources and reduce the waste of network bandwidth.

(2) forwarding the data by looking up a destination address carried in the frame, to find the identity of the segment corresponding to the protection tunnel, and the corresponding outlet, i.e. to find the corresponding segment identification protection tunnel segment protection tunnel, and the data frame tunnel identifier carried in the working segment is modified to protect the identity of the tunnel, to achieve fault protection tunnel segment partially replacing the tunnel work, in which case, see Figure 17, the proximal end of the device upstream of the start module 502 specifically comprises:

Modification unit 5024 for, when the working portion of the tunnel LSP fails, acquiring identification protection tunnel destination address segment corresponding to the data frame received by the receiving module 501 is carried in, the identification data frame modified to work tunnel protection tunnel segment identifier; locate the initiating unit 5025, it is used to find the corresponding segments of the protected tunnel forwarding table according to the identifier in the destination address segment and a data frame tunnel protected modified in the modification unit 5024, the segment start protection tunnel.

Feed-ho, the upstream proximal end of the device provided by forwarding module (503) may further embodiment of the present invention comprises: a judging unit 5034, configured to determine whether a failure recovered partially within a preset time;

First forwarding unit 5035, a judging unit 5034 when the judgment result is normal fault section, the frame receiving module 501 forwards the data received through the fault of the normal portion;

Second forwarding unit 5036, a judging unit 5034 when the determination result is returned to normal non-defective part, to identify segments of the protected tunnel forwarding table is modified to work tunnel identifier of the receiving module 501 forwards the received data frame to the the destination device.

In this manner, when the working LSP fails, the data identifying the upstream proximal end of the device carrying the received frame is modified tunnel work, the protection tunnel lookup segment, replacing the original work to find a tunnel segment protection tunnel occurs defective part. Avoids the data frame transmission process, because some failures of the tunnel, while discarding the entire tunnel work, to achieve the tunnel segment protection, efficient use of network resources, reduce the waste of network bandwidth.

(3) by using the address information to circumvent the fault data frame encapsulation portion, thereby obtaining segment protection tunnel to achieve part of the replacement work fault protection tunnel tunnel segment, this time, referring to Figure 18, the proximal end of the device upstream activation module 502 is specifically include:

Wu single package 5026, with ten small for the tunnel when the tunnel part fails, the receiving module 501 receives the encapsulated data frame, the data frame encapsulation carries the address information of the fault avoidance portion;

Find 5027, to find the segment protection tunnel, starts to find the start segment protection tunnel unit according to the address information of the data frame encapsulated by the encapsulating unit 5026 carries circumvent part of the fault;

Forwarding module (503) into a ho, the upstream proximal end of the apparatus according to an embodiment of the present invention may further comprise: a judging unit 5037, configured to determine whether a failure recovered partially within a preset time;

The first forwarding unit 5038, when the judging unit 5037 determines a result of failure when the normal part, the receiving module 501 forwards the data frame received by the failure of the normal portion;

Second forwarding unit 5039, when the judging unit 5037 determines a result of the fault portion is not returned to normal, an increase in its own forwarding table entry reaches the destination device, the outlet is connected to the entry segment protection tunnel outlet, deleted forwarding entries reach any original destination device, a data receiving module 501 forwards the received frame to the destination device.

In this manner, when the working LSP fails, the proximal end of the device upstream data frames received encapsulated object address circumvent part of the fault, the protection tunnel lookup segment, replacing the original work to find a tunnel segment protection tunnel the occurrence of defective part. Avoids the data frame transmission process, because some failures of the tunnel, while discarding the entire tunnel work, to achieve the tunnel segment protection, efficient use of network resources, reduce the waste of network bandwidth Example 6

Referring to FIG 19, embodiments of the present invention provides a proximal end of the downstream device, the apparatus comprising:

A receiving module 601 for receiving data frames;

Modification module 602, is used when the working LSP fails, the receiving module 601 receives the modified data frame; forwarding module 603, for the data modification module 602 to modify the frame forwarded to the destination device via the fault-free part of the work of the tunnel.

(1) When the receiving module receives the data frame is segmented when the protection is carried tunnel identification, modification module is specifically: identifier modifying unit 6021 for, when the working LSP fails, the receiving module 601 receives the data frame It identifies the segment protection tunnel is modified to identify the worker tunnel.

Ho into a downstream apparatus further includes a proximal end 604 updating module, for, when the defective part is not within a preset normal time, the work of identifying the tunnel forwarding table identifies changes protection tunnel segment, forwarding data frames to the destination device.

In this manner, when the working LSP fails, the proximal end of the downstream device identifying the data frame carried in the received segments of the protected modified tunnel identifier of the tunnel work, no fault will be forwarded through the tunnel part of the work data frame to the destination device . It avoids the data frame transmission process, as part of the fault in the tunnel-butoxy, butoxy and for discarding the entire tunnel, to achieve the tunnel segment protection, efficient use of network resources, reduce the waste of network bandwidth.

(2) when the receiving module receives data frames carrying time avoid the failure portion address information, modification module 602 is specifically: decapsulating Single Wu 6022, TEN when small for LSP fails, to the receiving module 601 receives the data decapsulating frames, the removal of the address information carried in the frame portion to circumvent the failure.

In this manner, when the working LSP fails, the downstream data frames received near-end device decapsulating the address information of defective part is removed to circumvent the work data frame tunnel carried by the fault-free part of the work of the data frame tunnel forwarded to the destination device. Avoids the data frame transmission process, because some failures of the tunnel, while discarding the entire tunnel work, to achieve the tunnel segment protection, efficient use of network resources, reduce the waste of network bandwidth.

By the above-described embodiments of the present invention, when a partial failure of the tunnel work tunnels, to provide protection ΡΒΒ ΤΕ tunnel segment, when a partial failure of the tunnel in tunnel work, instead of using the segment fault protection tunnel tunnel part of the work, the data failure to bypass the process of sending part of the work of the tunnel, continue to work trouble-free part of the tunnel, effective and rational use of network resources and avoid waste of network bandwidth, it offers a variety of fail-safe way for operators.

Ho step portion in the embodiment of the present invention may be implemented using software, the corresponding software program may be stored in a readable storage medium, such as an optical disk or a hard disk and the like.

The above are only preferred embodiments of the present invention, not intended to limit the present invention, any modifications within the spirit and principle of the present invention, the, equivalent substitutions, improvements should be included in the protection of the present invention within range.

Claims

Claims
CLAIMS 1. A method of forwarding data frames, characterized in that, said method comprising:
When operating in the tunnel section LSP fails, the upstream portion of the near-end device receives the failure data frame start segment protection tunnel, the tunnel segment protection is the start node upstream end device, terminal node downstream of the near-end device is part of the fault;
The protection tunnel to forward the data frame to the device through the proximal end of the downstream segment;
The proximal end of the device via the downstream forwarded to the destination device through a portion of the fault-free working of the tunnel.
2. The data forwarding method according to claim 1, wherein said starting segment ho quench protection tunnel comprises:
The proximal end of the upstream segment protection enabled device itself forwarding, forwarding suspended without failure;
Obtaining from the data frame tunnel identifier of the working, to find a corresponding identifier of the tunnel outlet work identified in the forwarding table segment protection, activating the outlet corresponding to the identifier segment protection tunnel.
3. The data forwarding method according to claim 1, wherein said starting segment ho quench protection tunnel comprises:
The upstream end device identifier lookup segment protection tunnel corresponding to the destination address carried in the data frame, the frame carries data identifying the working tunnel is modified to identify the segment protection tunnel, according to the the segment identifier and a destination address lookup protection tunnel corresponding to the tunnel segment protection in the forwarding table, the start segment protection tunnel; accordingly, the data frame through the tunnel are forwarded to the segments of the protected ho of the step is downstream of the proximal end of the device specifically: the modified data frame is forwarded to the protection tunnel downstream device through the proximal segment;
Accordingly, through the proximal end of the downstream apparatus through the working portion of the fault-free tunnel ho forwarded to the destination device step comprises:
After the apparatus receives from the proximal end of the downstream segment of the data frame tunnel protection, the frame carries data identifying the protected tunnel segment is modified to identify the working of the tunnel, the modified data frames via the fault-free working of the tunnel portion forwarded to the destination device.
4. The data forwarding method according to claim 1, wherein said starting segment ho quench protection tunnel comprises:
The upstream end device encapsulating the data frame, the data frame encapsulation carries the address information of the fault avoidance portion according to the address information of the defective part to circumvent the lookup segment protection tunnel starting points to find segment protection tunnel;
Accordingly, the data frame through the tunnel of the segments of the protected ho step forward to the proximal end of the downstream device specifically is: the data frame is forwarded through the package to find the segment protection tunnel to the downstream end device; accordingly, through the proximal end of the downstream apparatus through the working portion of the fault-free tunnel forwarded to the destination device ho step comprises:
After the segments of the protected tunnel from the data frame, the data frame decapsulating removed to circumvent the failure address information portion of the data frame carried in the downstream end device decapsulates the received data frame through the working portion of the fault-free tunnel forwarded to the destination device.
5. The forward data to any one of claims 1-4, said frame method as claimed in claim, wherein said proximal end portion through the fault-free working of the device by the tunnel downstream forwarded to the destination device ho after step further comprises:
When the preset time in the normal fault recovery section, as part of the fault of the working portion of the tunnel;
When the defective part within a preset time has not returned to normal, the fault-free parts of the tunnel segment protection tunnel to form a new working tunnel work.
6. The method of claim 5 forward data frame as claimed in claim, wherein said portion of said fault, as a part of the working tunnel ho step comprises:
Upstream of the proximal end of the apparatus to enable trouble-forwarding, pause the segment protection forwarding table, forwarding by said trouble identifying outlet table corresponding egress forwarding data frames;
The segment of the tunnel and the tunnel fault-free working portion of the work to form a new tunnel ho step comprises: an upstream proximal end of the apparatus enabling the trouble-forwarding, pause the forwarding segment protection, the fault-free working of the forwarding tunnel identifier corresponding to the identifier is modified to the outlet segment protection forwarding table corresponding to the exit sign, exit sign by forwarding data corresponding to the fault-free forwarding modification outlet frame.
The proximal end of the device upstream of the defective part by the return to normal: 7. The method of forwarding data frames of the 5 claims, characterized in that the defective part as a part of the working of the tunnel ho quench specifically the forwarding data frames received;
The segment of the tunnel and the tunnel fault-free working portion of the work to form a new tunnel ho step comprises: an upstream proximal end of the device will turn itself identify segments of the protected tunnel table is modified to work tunnel identifier identifying the downstream end device table will be transferred itself is modified to work segment protection tunnel identifier of the tunnel, forwarding the data frame to the destination device.
5 8. forwarding data frames method as claimed in claim wherein, wherein said portion of said fault, as a part of the working tunnel ho step is specifically: the upstream proximal end of the device through the recovery normal fault portion of said forwarding data frames received;
The segment of the tunnel and the tunnel fault-free working portion of the work to form a new tunnel ho step comprises: increasing the upstream proximal end of the device reaches the destination entry device in its own forwarding table, the entry an outlet to connect the segments of the protected tunnel exit, the forwarding table remove any original reaches the destination device, forwarding data frames to the destination device.
9. A method of forwarding data frames as claimed in claim 1, characterized in that the segments of the protected tunnel through static configuration or network management implemented path computation unit calculates a path through static configuration implemented.
Forwarding data as claimed in claim 1 of the frame, characterized in that the segments of the protected tunnel through the Generalized Multi-Protocol Label Switching signaling protocol or signaling calculated implemented calculation is achieved by fast reroute.
11. A system for forwarding data frames, wherein, said system comprising:
An upstream end device (401), when the working LSP fails, a failure at the upstream proximal end for activating the tunnel segment protection, protection tunnel to send the data frame segments, the upstream end device ( 401) is the start node segment protection tunnel;
No downstream end device (402), when the working LSP fails, the failure is located downstream of the proximal end, for receiving said data frame segments of the protected tunnel forwarding, the data frame tunnel through the working fault portion forwarded to the destination device, the downstream end device (402) is the tunnel end node segment protection.
12. The transponder data frame according to claim 11, characterized in that the upstream end device (401) comprising:
Receiving module (4011) for receiving data frames;
Switch module (4012), with ten small for the tunnel when the tunnel is faulty portion, to enable its own segment protection forwarding table, forwarding suspended without failure;
Obtaining module (4013) for acquiring the receiving module (4011) identification of the received data frame tunnel work; Find initiation module (4014), for the obtaining module (4013) according to the acquired job tunnel identifying, in the switching module (4012) to enable the segment protection forwarding table lookup identifies the corresponding working tunnel exit sign, exit sign corresponding to the start segment protection tunnel;
Forwarding module (4015) for forwarding the data frame by the lookup segment tunnel and the startup module (4014) initiated.
13. A system for forwarding data frames according to claim 11, characterized in that the upstream end device (401) comprising:
Receiving module (4016) for receiving data frames;
Modification module (4017) for, when the working portion of the tunnel LSP fails, acquiring said receiving module (4016) identification data carried in the received frame segment protection tunnel destination address corresponding to said data frame tunnel work identified in the segment identifier as modification of protection tunnel;
Find the start-up module (4018), a module (4017) and the destination address of data frame segments in the modified protection tunnel identifier in the forwarding table to find the corresponding segments of the protected tunnel according to the modification, the starting points segment protection tunnel; forwarding module (4019), by the lookup for the startup module (4018) initiated the modification segment protection tunnel forwarding module (4017) modified data frame;
Correspondingly, the downstream end device (402) comprising:
Receiving module (4021) for receiving data frames;
Modification module (4022) for identifying the data frame tunnel segment protection of the downstream end device (402) receiving module (4021) received modified to identify the working of the tunnel;
Forwarding module (4023) for the data modification module downstream of the proximal end of the device (4022) to modify the frame portion without failure forwarded to the destination device through the working tunnel.
14. The transponder data frame according to claim 11, characterized in that the upstream end device (401) comprising:
Receiving module (40,110) for receiving data frames;
Encapsulation module (40111) for, when the working portion of the tunnel LSP fails, the receiving module package (40,110) received data frame, data frame encapsulation carries small for the avoidance of the failure of part of the tunnel Address information;
Find the start-up module (40,112), the address information of the defective part to circumvent the encapsulated data frame carries according to the encapsulation module (40111) lookup segment protection tunnel, starts to find the segments of the protected tunnel;
Forwarding module (40113), by the search and for starting modules (40,112) initiated forwarding the segment protection tunnel encapsulation module (40111) the encapsulated data frame;
Correspondingly, the downstream end device (402) comprising:
Receiving module (4024) for receiving data frames;
Decapsulating module (4025) for the data in the downstream end device (402) receiving module (4024) decapsulates the received frame, the data frame is removed in the address information carried in the fault avoidance portion;
Forwarding module (4026), the data for decapsulating module (4025) decapsulates the frame by a portion of the fault-free working tunnel forwarded to the destination device.
Forwarding data as claimed in any one of claims 11-14-frame system according to claim, characterized in that, the system comprising:
Intermediate device (403), when the working LSP fails, the protective segment is in the tunnel, for receiving the data frame upstream end device (401) transmitted, and forwards the data frame to the downstream near-end device (402).
16. An apparatus upstream proximal end, wherein the upstream end device comprising:
Receiving module (501) for receiving data frames; initiation module (502) for, when the working LSP fails, start segment protection tunnel;
Forwarding module (503) for supplying the start-up module (502) to start forwarding the segment protection tunnel receiving module (501) the received data frame.
Upstream of the proximal end 17. The apparatus according to claim 16, characterized in that the starting module (502) comprises:
Switching means (5021) for, when the working portion of the tunnel LSP fails, to enable its own segment protection forwarding table, forwarding suspended without failure;
Acquisition means (5022) for acquiring said receiving module (501) identifies the received data frame tunnel work; search and activation unit (5023), for the working of the tunnel according to the acquired acquiring unit (5022) in identifier corresponding to the identifier to find said tunnel outlet work identified in the switching unit (5021) to enable the segment protection forwarding table, activate the outlet corresponding to the identifier segment protection tunnel.
Upstream of the proximal end 18. The apparatus according to claim 17, wherein said apparatus forwarding module (503) further comprises:
Determination means (5031) for determining whether a preset time whether the fault recovery stopper portion: regular;
Forwarding a first switching unit (5032) for, when the determining unit (5031) judges that the fault section during normal, fault-free to enable their forwarding, pause the forwarding segment protection;
The second switching unit forwarding Wu (5033), when the judgment unit with ten Wu (5031) judges that the fault section when not normal, enabling the trouble-forwarding, pause the protection switch segment published, and enable the trouble-free forwarding table corresponding to the identifier in the working tunnel exit sign replacing said segment protection forwarding table corresponding to the exit sign.
Upstream of the proximal end 19. The apparatus according to claim 16, characterized in that the starting module (502) comprises:
Modification means (5024) for, when the working portion of the tunnel LSP fails, acquiring said receiving module (501) identification data carried in the received frame segment protection tunnel destination address corresponding to said data frame tunnel work identified in the segment identifier as modification of protection tunnel;
Find the start-up unit (5025) for a destination address segment and the modified data frame tunnel identification protection unit (5024) in the forwarding table to find the corresponding segments of the protected tunnel according to the modification, the starting points segment protection tunnel.
Upstream of the proximal end 20. The apparatus according to claim 19, wherein said apparatus forwarding module (503) further comprises:
Determination means (5034) for determining whether a preset time portion of the failure is restored to normal;
First forwarding means (5035) for, when the determining unit (5034) when the determination result is normal fault section, the forward portion of the receiving module by a failure of the normal (501) the received data frame; first two forwarding unit (5036) for, when the determining unit (5034) judges that the fault section when not normal, the transfer segment protection tunnel identifier table is modified to work tunnel identifier, forwarding said receiving module (501) the data frame to the destination device.
Upstream of the proximal end 21. The apparatus according to claim 16, characterized in that the starting module (502) comprises:
Package unit (5026) for, when the working portion of the tunnel LSP fails, the package receiving module (501) the received data frame, the data frame encapsulation carries the address information of the fault avoidance portion;
Find the start-up unit (5027), for finding segments of the protected tunnel from the address information of the package units (5026) of the encapsulated data frame carries said part of the fault avoidance, the search start segment protection tunnel.
Upstream of the proximal end 22. The apparatus according to claim 21, wherein said apparatus forwarding module (503) further comprises:
Determination means (5037) for determining whether a preset time portion of the failure is restored to normal;
First forwarding means (5038) for, when the determining unit (5037) judges that the fault recovery stopper portion: the normally received forward the receiving module (501) by the failure of the normal portion of the data frame ;
Second forwarding means (5039) for, when the determining unit (5037) judges that the fault section when not normal, an increase in its own forwarding table entry reaches the destination device, the entry of the U connecting the outlet segment protection tunnel delete the forwarding table any original reaches the destination device, and forwards the receiving module (501) the received data frame to the destination device.
23. The proximal end of the downstream-species, characterized in that the downstream end device comprising:
Receiving module (601) for receiving data frames;
Modification module (602) for, when the working LSP fails, modifying the data frame received by the receiving module (601);
Forwarding module (603), the modification module for forwarding (602) the modified data frame tunnel through the working portion to the destination device without failure.
24. The proximal end of the downstream apparatus according to claim 23, wherein the modification module (602) is specifically: identification modification means (6021) for, when the working LSP fails, the receiving module ( 601) identifies segments of the protected tunnel the received data frame is modified to identify the working tunnel.
25. The proximal end of the downstream apparatus according to claim 24, wherein said apparatus further comprises:
Updating module (604) for a predetermined time when the defective part is not normal, the work of identifying the tunnel forwarding table is modified to protect the identity of the tunnel segment, forwarding the data frame to the destination device .
26. The proximal end of the downstream apparatus according to claim 23, wherein the modification module (602) is specifically: decapsulating unit (6022) for, when the working LSP fails, the receiving module ( 601) the received data frame decapsulating removing the address information carried in the data frame to circumvent the failed portions.
PCT/CN2008/072154 2007-11-13 2008-08-26 Method, system and device for forwarding the data frames WO2009062420A1 (en)

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CN2007101945554A CN101436976B (en) 2007-11-13 2007-11-23 A method of forwarding data frames, the system and apparatus

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US12/778,191 US20100284270A1 (en) 2007-11-13 2010-05-12 Method, system, and device for forwarding data frames
US13/337,577 US9237032B2 (en) 2007-11-13 2011-12-27 Method, system, and device for forwarding data frames

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