CN101262301A - A PW label correction processing method and its device in MPLS transmission network - Google Patents
A PW label correction processing method and its device in MPLS transmission network Download PDFInfo
- Publication number
- CN101262301A CN101262301A CNA2007100379677A CN200710037967A CN101262301A CN 101262301 A CN101262301 A CN 101262301A CN A2007100379677 A CNA2007100379677 A CN A2007100379677A CN 200710037967 A CN200710037967 A CN 200710037967A CN 101262301 A CN101262301 A CN 101262301A
- Authority
- CN
- China
- Prior art keywords
- label
- mpls
- correction
- frame
- pwe3
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Images
Landscapes
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention provides a correction processing method for PW (virtual path) labels in an MPLS (Multi-Protocol Label Switching) transport network. When source equipment carries out MPLS data frame encapsulation of PWE3 (edge-to-edge pseudo wire emulation) for client layer data, an option used for PW label correction processing is set, and the correction processing method selected by PW labeled value is coded; when target equipment carries out MPLS data frame de-capsulation of PWE3, the option is identified and the corresponding correction processing method is used for decoding, and PW labeled values are compared for correction processing. The correction processing method of the invention can timely correct the PW label errors produced in the MPLS transport network.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to signal processing method and device thereof in a kind of multiprotocol label switching (mpls) transmission network.
Background technology
At present, broadband access has become the topmost profit growth point of Virtual network operator, the application and the development of treble play, commercial applied business and mobile data services etc., stimulated the growth of the network bandwidth, thereby spurred Development of Metro Area Optical Network, metropolitan area optical network has been proposed corresponding carrying demand.
Metropolitan area bearer network towards the broadband can have two kinds of network technologies to select, a kind of data network that is based on ethernet technology, and another kind is based on the transmission network of multi-service transport platform (MSTP).Yet, supporting the Time Division Multiplexing business, network enabled operation, maintenance and management (OAM) ability aspect have remarkable advantages based on the transmission network of MSTP.
Development from transmission network, MSTP can support the Layer 2 data function better from supporting Ethernet service point-to-point transparent transmission to develop into, support bandwidth sharing, service convergence, the Ethernet of Ethernet service to share functions such as ring, thereby make bandwidth availability ratio improve greatly; By supporting MPLS, Bandwidth Management can be provided, can isolate the user in the metropolitan area network, the data business is had better tenability.
Here, in conjunction with shown in Figure 1, we do simple declaration to the data encapsulation mode that MPLS transmits in the net.It is as follows that the MPLS network transmits the protocol architecture that is adopted: client layer/MPLS layer/service layer.As previously mentioned, client layer can be Ethernet (Ethernet), and TDM, ATM(Asynchronous Transfer Mode) or frame relay particular traffic type such as (FR) has only been illustrated the Ethernet data frame format in the legend; When client layer is mapped to the MPLS layer, can adopt edge-to-edge pseudo-line simulation (PWE3) method for packing, PWE3 is as a kind of mechanism that goes up the various point to point service, PTP of simulation at packet switching network (PSN), the necessary attribute that it utilizes the tunneling mechanism on the PSN to simulate a kind of business, the tunnel here is called virtual path (PW).PWE3 encapsulates the particular traffic data unit (PDU) from client layer, and PDU contains necessary data of emulation specific transactions and control information in the inside.Use PWE3 mechanism, operator can transfer to all types of transport services among the network (as IP/MPLS) of a fusion.Angle from the user, can think that the virtual path of PWE3 simulation is a kind of link or circuit of special use, the PWE3 encapsulation need further be added options such as controlling (Control) word, virtual path (PW) label and tunnel (Tunnel) label and be provided with on client layer particular traffic data unit basis; Service layer can be SDH (SDH (Synchronous Digital Hierarchy)), PDH (asynchronous digital system), OTH (optical transport hierarchy) or OCH (optical channel), MPLS layer data frame enters service layer and transmits so that GFP (general frame forming process) or other protocol modes LAPS (Link Access Procedure on the SDH), PPP/HDLC (peer-peer protocol/High-Level Data Link Control) are packed, in the legend example a kind of typical GFP Frame packaged type.
Yet, transmit in the net at MPLS, mistake appears in client layer particular traffic data unit in transport process, target device can be according to the control information in the client layer, for example one too the FCS (frame check sequence) in the net data frame carry out correction process; Equally, the OAM mechanism in the service layer can be carried out correction process to the transport layer mistake that occurs in the transport process; Yet for the MPLS layer, the OAM mechanism that it is corresponding, for example detection of connectivity (CV), forward error indication (FDI), back only can be found mistake and can not carry out correction process to mistake indication (BDI), quick error detection modes such as (FFD).Especially for the PW label of MPLS layer, as a option with global sense, when it mistake occurs in transport process, target device will produce wrong processing to data carried by data unit in the client layer, also can not give network management system with this situation report.
Summary of the invention
The present invention aims to provide a kind of MPLS and transmits the technical scheme of in the network PW tag error of MPLS layer being carried out correction process.
According to an aspect of the present invention, the method of PW label correction in a kind of MPLS network is provided here, comprise: a), source device is in MPLS Frame when encapsulation of the client layer data being carried out PWE3, be provided with one and be used for the option that the PW label correction is handled, and select the correction process mode to carry out encoding setting the PW label value; B), when the target device MPLS Frame decapsulation of carrying out PWE3 is handled, discern described option and adopt corresponding correction process mode to decode, contrast the PW label value and carry out correction process.
Preferably, source device is provided with one and is used to indicate the sign position (C) of supporting that the PW label correction is handled when the MPLS Frame encapsulation of carrying out PWE3 in the said method step a) in its control word option.
Preferably, said method step a), b) in, the correction process mode is Cyclic Redundancy Check processing mode or position intersection odd even (BIP) processing mode.
According to another aspect of the present invention, PW label correction sending ending equipment in a kind of MPLS network further is provided here, it comprises a MPLS Frame packaging system, when carrying out the PWE3 encapsulation process from the data of client layer, be provided with one and be used for the option that the PW label correction is handled, and select the correction process mode to carry out encoding setting the PW label value.
Preferably, above-mentioned MPLS Frame packaging system further when the PWE3 encapsulation process, is provided with one and is used to indicate the sign position (C) of supporting that the PW label correction is handled in the control word option.
Preferably, the correction process mode of above-mentioned MPLS Frame packaging system is CRC processing mode or BIP processing mode.
According to another aspect of the present invention, PW label correction receiving device in a kind of MPLS network further is provided here, it comprises a MPLS Frame de-encapsulating devices: when the MPLS Frame decapsulation of carrying out PWE3 from the data of service layer is handled, discern the PW label correction option of described MPLS Frame and decode, contrast the PW label value in corresponding correction process mode and carry out correction process.
Preferably, above-mentioned MPLS Frame de-encapsulating devices, when handling carry out the PWE3 decapsulation from the data of service layer, one that discerns described MPLS Frame is used to indicate the sign position (C) of supporting the PW label correction to handle to determine that also whether carrying out the PW label correction handles.
Preferably, the correction process mode of above-mentioned MPLS Frame de-encapsulating devices is CRC processing mode or BIP processing mode.
According to another aspect of the present invention, here further provide a kind of MPLS of being used for to transmit the MPLS data frame structure of network, comprise tunnel label, PW label, control word and client layer data cell, this MPLS data frame structure comprises that further is used for the option that the PW label correction is handled, and it carries the coding that the PW label value is carried out correction process.
Preferably, the control word of above-mentioned MPLS data frame structure comprises that one is used to indicate this MPLS Frame to support the sign position (C) that the PW label correction is handled.
According to foregoing invention thought, the target network element that receives MPLS Frame of the present invention can be corrected timely to transmitting the PW tag error that is produced in the network.
Description of drawings
By the detailed description with the accompanying drawing that proposes below, it is more obvious that feature of the present invention, character and advantage will become, and components identical has identical sign in the accompanying drawing, wherein:
Fig. 1 is that MPLS transmits the data encapsulation mode in the net;
Fig. 2 is the MPLS Frame according to the PWE3 of the PW of being used for label correction processing provided by the present invention;
Fig. 3 carries out encapsulating flow chart illustration based on the MPLS Frame of PWE3 according to source device of the present invention;
Fig. 4 is that target device according to the present invention is in the MPLS Frame handling process legend based on PWE3;
Embodiment
Below in conjunction with accompanying drawing, preferred implementation of the present invention is described in detail.
Fig. 2 is the MPLS data frame format of handling according to the PW of being used for label correction provided by the present invention based on PWE3; Generally include following data field respectively according to order of transmission: tunnel label 21, length are 32, i.e. the MPLS label; PW label 22, length are 32, i.e. the inner label of MPLS label writing paper is used to realize many PW multiplexing of the inside, a tunnel; Control word 23 is used to carry out the controlled function of MPLS; The client layer data cell, indefinite length, i.e. the client layer particular traffic data unit of PWE3 emulation.According to embodiment of the present invention, we are provided with one and are used for the option 25 that the PW label correction is handled in the MPLS Frame, and its length is decided to be 32 here approximately, and select a kind of correction process mode to encode according to the PW label value option 25 is provided with; Option 25 can be arranged on the afterbody of MPLS Frame.
As another preferred implementation, option 25 can adopt the common coded system with correction process ability to be provided with, and for example is the Cyclic Redundancy Check coding, or position intersection odd even (BIP) processing mode etc.
As another preferred implementation, our suggestion is provided with a sign position C in control word 23, one is used to indicate this MPLS Frame to support the PW label correction to handle, for example sign position C represents this MPLS Frame for " 0 " and does not support the PW label correction to handle, and target device can be handled when receiving Frame in a conventional manner; As identify a C and represent this MPLS Frame for " 1 " and support the PW label correction to handle, target device is when carrying out the control word processing, discern this sign position C, further extract the option that PW label correction corresponding in the MPLS Frame is handled, and decode, contrast the PW label value according to corresponding correction process mode and carry out correction process.
Below, we carry out being described further based on the MPLS Frame encapsulation process of PWE3 to source device of the present invention further combined with Fig. 3; Source device comprises a MPLS Frame packaging system, to data from client layer, for example the Ethernet Frame adopts the PWE3 mode to carry out MPLS intermediate layer encapsulation process, MPLS Frame after the encapsulation is further packed to be entered service layer and is sent in the MPLS network and transmits, and its MPLS Frame packaging system is carried out following handling process:
Flow process starts from step S30, in step S31, source device is handled at first carry out certain format packing from the particular traffic data of client layer, with the Ethernet type of service is example, when carrying out the PWE3 encapsulation process, it need remove the transport overhead of Ethernet Frame, for example deletes lead code, Frame Check Sequence (FCS) and the possible extension bits (Extension) of Ethernet Frame; Next, among the S32 of step, S33, the S34, source device is respectively Service Data Unit (PDU) after the above-mentioned processing further to be added and control word, PW label, tunnel label is set; According to inventive concept, when receiving the MPLS Frame, obtain correct PW value in order to ensure target device, among the step S36, source device selects a kind of correction process mode to encode to the PW label value, and above-mentioned coding result is added in the option 25 of formed MPLS Frame afterbody.Coded system with correction process ability--Cyclic Redundancy Check is encoded to example with common, and the essence of CRC is the remainder of mould-2 division, and the divisor difference of employing, the type of CRC are also just different.Usually, the divisor of CRC is represented with generator polynomial.Here with CRC32 example, the rule that 32 CRC sign indicating number produces is the binary sequence number that will send earlier---PW label value moved to left after 32 (both having multiply by 2^32), divided by a multinomial, last resulting remainder promptly is the CRC sign indicating number, with it option 25 is provided with again; Final step S37, source device carries out service layer's Frame encapsulation and transmission to the MPLS Frame of last formation.
Consider from the compatibility of the network equipment, suggestion is in step S32, source device is used for representing with a sign position C whether this MPLS Frame has PW label correction option when being provided with carrying out control word, so, to help target device that the differentiated treatment of MPLS Frame is treated: when target device when receive handling the MPLS Frame, can whether have the C identification of sign position according to it and judge it and whether comprise the option 25 that the PW label correction is handled, for example sign position C represents that for " 1 " this MPLS Frame has PW label correction option, and carry out respective handling (will in Fig. 4, further specify); If the sign position is " 0 ", represent that this MPLS Frame is a MPLS Frame in general sense.
Next, we carry out being described further based on the MPLS Frame handling process of PWE3 to target device of the present invention further combined with Fig. 4; Target device comprises a MPLS Frame de-encapsulating devices, it is to peeling off MPLS Frame after the service layer encapsulation and handle and being used for the option that the PW label correction handles the PW label is carried out restoring customer data after the correction process according to entrained, and its MPLS Frame de-encapsulating devices is carried out following handling process:
Flow process starts from step S40, and among the following step S41, reception peels off the MPLS Frame after service layer's information; Step S42, tunnel label is handled, and finds that this equipment is the target device of final jump in the MPLS network, and it peels off this label; Step S43 checks whether the MPLS Frame that is received supports PW label correction processing capacity, and it reads the sign position C of control word, judges whether to differentiate for " 1 ", if do not support, jumps to step S47; Otherwise in following step S44, target device carries out the Cyclic Redundancy Check coding to the PW label of MPLS Frame and calculates the CRC ' that makes new advances, and with aforementioned MPLS data frame structure in option 25 in encoded radio CRC compare, if do not match, then carry out the PW label correction and handle, restore correct PW label value, as relatively newer crc value that calculates and crc value different originally, judge the bit position of making a mistake in the label, the bit that makes a mistake is reversed.(step S46A), and further generate a report message to network management system (step S46B); Among the step S47, target device is according to the correct PW label that is obtained, and makes different flows according to label value and handles, and row handled or broadcast/group broadcast/unicast service processing etc. as QoS.Among the step S48, the customer data reduction in the Frame of target device after with above-mentioned processing becomes ethernet data frame, for example: add lead code, generate new FCS etc.
Although above-mentioned being illustrated as the invention provides some embodiment; be not to be used for limiting protection scope of the present invention; the professional in present technique field can carry out various modifications to embodiment under the prerequisite that does not depart from the scope of the present invention with spirit, this modification all belongs in the scope of the present invention.
Claims (11)
1. a multiprotocol label switching (mpls) transmits virtual path (PW) label correction processing method in the network, comprising:
A), source device is in MPLS Frame when encapsulation of the client layer data being carried out edge-to-edge pseudo-line simulation (PWE3), be provided with one and be used for the option that the PW label correction is handled, and select the correction process mode to carry out encoding setting the PW label value;
B), when the target device MPLS Frame decapsulation of carrying out PWE3 is handled, discern described option and adopt corresponding correction process mode to decode, contrast the PW label value and carry out correction process.
2. the method for claim 1 is characterized in that in the described step a), and source device is provided with one and is used to indicate the sign position (C) of supporting that the PW label correction is handled when the MPLS Frame encapsulation of carrying out PWE3 in its control word option.
3. method as claimed in claim 1 or 2 is characterized in that described step a), b) in, the correction process mode is Cyclic Redundancy Check processing mode or position intersection odd even (BIP) processing mode.
4. a multiprotocol label switching (mpls) transmits the network element device of network, comprising:
A MPLS Frame packaging system, when carrying out edge-to-edge pseudo-line simulation (PWE3) encapsulation process from the data of client layer, be provided with one and be used for the option that virtual path (PW) label correction is handled, and select the correction process mode to carry out encoding setting the PW label value.
5. network element device as claimed in claim 4 is characterized in that described MPLS Frame packaging system further when the PWE3 encapsulation process, is provided with one and is used to indicate the sign position (C) of supporting that the PW label correction is handled in the control word option.
6. as claim 4 or 5 described network element devices, the correction process mode that it is characterized in that described MPLS Frame packaging system is Cyclic Redundancy Check processing mode or position intersection odd even (BIP) processing mode.
7. a multiprotocol label switching (mpls) transmits the network element device of network, comprising:
MPLS Frame de-encapsulating devices: when the MPLS Frame decapsulation of carrying out edge-to-edge pseudo-line simulation (PWE3) from the data of service layer is handled, discern virtual path (PW) the label correction option of described MPLS Frame and decode, contrast the PW label value in corresponding correction process mode and carry out correction process.
8. network element device as claimed in claim 7, it is characterized in that described MPLS Frame de-encapsulating devices, when handling carry out the PWE3 decapsulation from the data of service layer, one that discerns described MPLS Frame is used to indicate the sign position (C) of supporting the PW label correction to handle to determine that also whether carrying out the PW label correction handles.
9. as claim 7 or 8 described network element devices, the correction process mode that it is characterized in that described MPLS Frame de-encapsulating devices is Cyclic Redundancy Check processing mode or position intersection odd even (BIP) processing mode.
10. one kind is used for the MPLS data frame structure that multiprotocol label switching (mpls) transmits network, comprise tunnel label, virtual path (PW) label, control word and client layer data cell, it is characterized in that it comprises that further is used for the option that the PW label correction is handled, it carries the coding that the PW label value is carried out correction process.
11. MPLS data frame structure as claimed in claim 11 is characterized in that described control word comprises that one is used to indicate this MPLS Frame to support the sign position (C) that the PW label correction is handled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100379677A CN101262301A (en) | 2007-03-09 | 2007-03-09 | A PW label correction processing method and its device in MPLS transmission network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100379677A CN101262301A (en) | 2007-03-09 | 2007-03-09 | A PW label correction processing method and its device in MPLS transmission network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101262301A true CN101262301A (en) | 2008-09-10 |
Family
ID=39962541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100379677A Pending CN101262301A (en) | 2007-03-09 | 2007-03-09 | A PW label correction processing method and its device in MPLS transmission network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101262301A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674239B (en) * | 2009-10-10 | 2012-04-25 | 华为技术有限公司 | Method and device for providing web service |
| CN101425879B (en) * | 2008-12-12 | 2012-08-08 | 北京邮电大学 | TDM/PW space time diversity method based on T-MPLS packet transmission network |
| CN101635727B (en) * | 2009-08-24 | 2013-04-24 | 华为技术有限公司 | Method, device and system for securely transmitting and receiving pseudowire network data |
| CN103475443A (en) * | 2012-06-07 | 2013-12-25 | 中兴通讯股份有限公司 | Method and system for error code detection and correction processing of transmitted data |
| US11792042B1 (en) * | 2021-04-29 | 2023-10-17 | Cisco Technology, Inc. | Interworking between different layer two medias using network tunnels |
-
2007
- 2007-03-09 CN CNA2007100379677A patent/CN101262301A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425879B (en) * | 2008-12-12 | 2012-08-08 | 北京邮电大学 | TDM/PW space time diversity method based on T-MPLS packet transmission network |
| CN101635727B (en) * | 2009-08-24 | 2013-04-24 | 华为技术有限公司 | Method, device and system for securely transmitting and receiving pseudowire network data |
| CN101674239B (en) * | 2009-10-10 | 2012-04-25 | 华为技术有限公司 | Method and device for providing web service |
| CN103475443A (en) * | 2012-06-07 | 2013-12-25 | 中兴通讯股份有限公司 | Method and system for error code detection and correction processing of transmitted data |
| US11792042B1 (en) * | 2021-04-29 | 2023-10-17 | Cisco Technology, Inc. | Interworking between different layer two medias using network tunnels |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3160073B1 (en) | Method and optical switching node for transmitting data packets in an optical transmission network | |
| CA2416082C (en) | Method of and system for the transfer of sonet traffic across a packet network | |
| US8667374B2 (en) | Video transmission systems and methods over carrier ethernet | |
| CN101022405B (en) | Universal framing rule packaging method | |
| CN100355248C (en) | Multiple business realizing method based on ethernet passive optical network | |
| US8023505B2 (en) | Circuit emulation service method and telecommunication system for implementing the method | |
| JP2018207523A (en) | Method and device for transmitting and receiving packet in communication system | |
| US8707137B2 (en) | Adapting bit error rate to a target quality of service | |
| US8160106B2 (en) | Method, device and system for transmitting Ethernet packets | |
| US20060002304A1 (en) | Method and apparatus for implementing link-based source routing in generic framing protocol | |
| CA2382271A1 (en) | Circuit emulation service over an internet protocol network | |
| JP3543698B2 (en) | Transmission method and network system | |
| CN101877620B (en) | Method, apparatus and system for forward error correction | |
| CN109450875A (en) | MAC layer packaging method and device | |
| CN101262301A (en) | A PW label correction processing method and its device in MPLS transmission network | |
| KR20130007645A (en) | Method, apparatus and system transmitting sdh/sonet section overhead bytes | |
| US20090185578A1 (en) | Method, apparatus and system for transmitting fiber channel service | |
| US7672330B2 (en) | Methods for sending and receiving network management messages and/or control messages | |
| KR101337054B1 (en) | Synchronizing packet sequence numbers for line card redundancy | |
| CN101904139B (en) | Adaptation scheme for communications traffic | |
| CN112350798A (en) | Packet transmission method and device | |
| US20050169275A1 (en) | Method for transmitting multi-protocol label switch protocol data units | |
| JP5372248B2 (en) | Maintaining time division multiplexing through pseudowire connections during network failures | |
| US11251905B2 (en) | Method for receiving code block stream, method for transmitting code block stream, and communications apparatus | |
| CN101132371B (en) | Pseudo-wire business protection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20080910 |