CN100484097C - Method for judging pseudo wire connection state in packet-switching network and service apparatus thereof - Google Patents
Method for judging pseudo wire connection state in packet-switching network and service apparatus thereof Download PDFInfo
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Abstract
The invention discloses a judging method of false path connecting condition in the packet-switching network, which is characterized by the following: increasing false path operational management and maintenance report to detect the interconnection condition of false path; receiving the report through end service equipment; responding corresponding report; regarding the false path normal among service equipments after the local end service equipment receives the respond report within preset time. The invention proceeds operational management and maintenance report sending, receiving and disposal for false path through OAM mode, which finishes detecting connectivity of PW data plane effectively.
Description
Technical field
The present invention relates to the packet network technical field, relate in particular to method and the service equipment of judging pseudo wire connection state in a kind of packet network.
Background technology
At present operator is when providing multiple business, employing substantially all be the mode of parallel or " overlapping ": set up and safeguard multiple network, presenting a little at every kind of different different access device of business use.Do like this except making the network planning more the complexity, and be that construction cost or operation cost are all very expensive.So operator when multiple business is provided, builds and operation cost in order to reduce, and wishes to seek a kind of method that multiple business can be provided on public packet network (PSN).
For unified multibusiness network platform is provided, IETF has begun the standardization effort of on packet network " the X over PSN " of any business of transmission, and the pseudo-end to end circuit emulation of its called after (Pseudo-Wire Emulation Edge-to-Edge is abbreviated as PWE3).
Dynamically the foundation of PW is the result that two ends PE (Provider Equipment, service provider's equipment) consults mutually, needs the participation of LDP (label distribution protocol).Two ends PE wants mutual local PW forwarding state.The forwarding state of local PW depends on the state of the outer layer tunnel of the state of LDP session (LDP session) of state that the AC (attached circuit or direct-connected circuit) that need carry out emulation is professional and far-end PE and carrying pseudo-line service.
OAM (Operations, Administration and Maintenance) function is very important in public network, and it can be simplified network operation, monitoring network performance, reduce the network operation cost.In the network that provides quality of service (QOS) to guarantee, OAM(Operation Administration Maintenance) is even more important.MPLS supports QOS and various network services as the key technology of prolongable next generation network, requires Operations, Administration and Maintenance (OAM) function equally.All MPLS OAM messages of ITU-T-Y.1711 regulation all use a reservation label value 14 that the whole world is known, are called " OAM Alert Label ", to be different from common MPLS customer flow message.
OAM defects detection function is based on the periodicity transmission from the source end (ingress) of LSP (label switched path) to Su Duan (egress) of CV (connective confirm) message or FFD (failure detection fast) message.The OAM message is encapsulated as MPLS (Multiple protocol label switching at the source end, multiprotocol label switching) message, the outer layer label that is message is the outgoing label of LSP (label switched path) at this node, the vpn label value is 14 (OAM Route alert label), and all the other are OAM protocol massages payload.When Su Duan detects defective, can send BDI (oppositely defects detection) message to the place end, can know the state of current LSP like this at the sourcesink node of LSP by backward channel.
OAM message payload is made of OAM(Operation Administration Maintenance) type, specific function type data and 1 common BIP16 error detection mechanism.For accelerating to handle and support the minimum message length of existing two layers of technology (as Ethernet), the minimum load length of all OAM messages is necessary for 44 byte longs.
Y.1711 the two kinds of messages that have that are used for connectivity verification in the MPLS OAM mechanism of Ti Chuing, i.e. CV and FFD message.Wherein, in the CV message one second one, 50 milliseconds of (also can be configured to 10 milliseconds, 20 milliseconds, 100 milliseconds, 200 milliseconds and 500 milliseconds) of FFD message acquiescence.MPLS OAM defects detection function is based on CV message or the FFD message periodicity from the source end (ingress) of LSP to Su Duan (egress) and sends.
PW is appreciated that to being made up of two reverse LSP at datum plane.Therefore, similar with MPLS LSP, PW equally also needs a kind of detection technique, detects the validity of its connection.But ITU-T can't be applicable to the state-detection of PW in the OAM defects detection that Y.1711 proposes.On the data forwarding plane, MPLSLSP is unidirectional, can carry out the datum plane trouble shooting by the detection mode of " source is sent out the place and received " of describing in Y.1711, promptly the source end periodically sends the OAM detection messages to the place end, and Su Duan checks whether receive detection messages at the appointed time.This detection mode can only satisfy the detection of connectivity of one way link, and PW then is a two-way link, and existing Y.1711 OAM test mode can only satisfy the inspection of a direction of its datum plane, can't satisfy the detection of PW.
Summary of the invention
Technical problem to be solved by this invention is: overcome the deficiency that prior art OAM defects detection can't be applicable to the PW state-detection, method and the service equipment of judging pseudo wire connection state in a kind of packet network are provided, realize utilizing the OAM mode effectively to finish the detection of PW data-plane connectivity.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
Judge the method for pseudo wire connection state in this packet network, may further comprise the steps:
Increase pseudo-line loop operation and administer and maintain message, be used for pseudo-circuit connected state and detect, wherein, described pseudo-line loop operation administers and maintains message and comprises three layers of label, outermost layer is the label switched path label, and the centre is pseudo-circuit label, and innermost layer is the Operations,Administration And Maintenance special tags;
The local terminal service equipment sends described pseudo-line loop operation and administers and maintains message, and the opposite end service equipment receives after described pseudo-line loop operation administers and maintains message, replys corresponding pseudo-line loop operation and administers and maintains message;
In Preset Time, receive the message of described answer when the local terminal service equipment after, think that the pseudo-circuit between the service equipment is normal.
Whether wherein, service equipment constantly sends pseudo-line loop operation by pseudo-line link and administers and maintains message, and detect the message that sends and return in the default time, determines whether pseudo-circuit breaks down.
Wherein, pseudo-circuit effective marker position is set in pseudo-circuit hardware forwarding table, be used for the bound data message forwarding, described pseudo-circuit effective marker position is controlled by the result whether pseudo-circuit of described detection breaks down, when the pseudo-circuit of this mark position bit representation was effective, data message can normally be transmitted; Otherwise do not transmit.
Wherein, described opposite end service equipment receives after described pseudo-line loop operation administers and maintains message, and pseudo-circuit label is carried out replacement operation, obtains new pseudo-circuit label, and the label by new acquisition administers and maintains message with pseudo-line loop operation and is transmitted back to local terminal.
Wherein, described opposite end service equipment is set up the replacement list item of vpn label, and is issued to hardware, and it is received after described pseudo-line loop operation administers and maintains message, can carry out the replacement of pseudo-circuit label.
Wherein, comprise three layers of label in the Operations,Administration And Maintenance message of described pseudo-circuit, outermost layer is the label switched path label, and the centre is pseudo-circuit label, and innermost layer is the Operations,Administration And Maintenance special tags; The opposite end service equipment receives after described pseudo-line loop operation administers and maintains message, and described label switched path label is made stack operation, and described pseudo-circuit label is carried out replacement operation.Wherein, add the Operations,Administration And Maintenance flag bit in going into territory label mapping table, whether the corresponding pseudo-circuit of expression configuring operation management and maintenance function.
Wherein, described opposite end service equipment receives that treatment step comprised when pseudo-line loop operation administered and maintained message:
Outer field label switched path label is popped, look into the described territory label mapping table of going into according to pseudo-circuit label then, check described Operations,Administration And Maintenance flag bit;
Judge pseudo-circuit whether configuring operation management and maintenance function according to described Operations,Administration And Maintenance flag bit, if do not have, then all transmit all normal process; If pseudo-circuit is configuring operation management and maintenance function, then judge one deck label down;
If there is one deck label down, and be label at the bottom of the stack, label value equals 14, show that then catching message is that pseudo-line loop operation administers and maintains message, this Operations,Administration And Maintenance message is done replacement operation, obtain new label switched path label and pseudo-circuit label, re-assembly pseudo-line loop operation and administer and maintain message, send it back described local terminal service equipment.
Service equipment in corresponding a kind of packet network comprises sending module and receiver module, also comprises the Operations,Administration And Maintenance module that is connected with receiver module with described sending module; Described Operations,Administration And Maintenance module sends pseudo-line loop operation by described sending module and administers and maintains message to the opposite end service equipment; Described pseudo-line loop operation administers and maintains message and comprises three layers of label: outermost layer is the label switched path label, and the centre is pseudo-circuit label, and innermost layer is the Operations,Administration And Maintenance special tags; After described receiver module receives message, giving described Operations,Administration And Maintenance module handles, if during the answer Operations,Administration And Maintenance message of the transmission message that received packet sends for the described opposite end service equipment of receiving, think that the pseudo-circuit between the service equipment is normal in Preset Time.
Service equipment in corresponding a kind of packet network comprises sending module and receiver module, also comprises the Operations,Administration And Maintenance module that is connected with described sending module; Described receiver module receives pseudo-line loop operation and administers and maintains message, gives described Operations,Administration And Maintenance module and handles; Wherein, described pseudo-line loop operation administers and maintains message and comprises three layers of label: outermost layer is the label switched path label, and the centre is pseudo-circuit label, and innermost layer is the Operations,Administration And Maintenance special tags; Described Operations,Administration And Maintenance module administers and maintains message with described pseudo-line loop operation and returns to transmit leg by described sending module.
Beneficial effect of the present invention is: the OAM defects detection that Y.1711 the present invention's expansion proposes, make OAM label network performance monitoring, the fault warning mechanism of this special use be applicable to PW, effectively finish the detection of PW data-plane connectivity, realize judging that PW connects the function of break-make.
Detection method of the present invention is general, and in whole testing process, the processing of PW-OAM message does not relate to any concrete business.The special line of detected PW emulation or link can be stipulate in the IEEE PWE3 draft any, as Eth/TDM/FR/ATM etc.
Description of drawings
Fig. 1 detects principle schematic for the present invention;
Fig. 2 is a PW OAM testing process schematic diagram of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
Existing realization OAM(Operation Administration Maintenance) can have dual mode, and first kind is that the special-purpose OAM label of definition carries out network performance monitoring, and fault warning is similar to the oam cell among the ATM; Second kind is the Ping that is similar in the traditional IP, by analog IC MP (Internet Control Message Protocol) echo request and reply, finds and locating network fault.In the present invention, above-mentioned two kinds of OAM implementations are combined, that is: the special-purpose OAM label of definition by analog IC MPecho request and reply, carries out the PW fault detect.
As shown in Figure 1, PE1 is responsible for sending OAM message (request), and this paper is referred to as PW OAM masters; After PE2 receives the OAM message, reply corresponding OAM message (reply), this paper is referred to as PW OAM passive side.By PW OAM message having a try on detected PW link, after PE1 receives message at the appointed time, think that this PW is normal; Otherwise, produce fault warning.Step is as follows:
1, PW OAM masters sends PW OAM message;
2, after PW OAM passive side receives, reply PW OAM message;
3, after PW OAM masters detects and whether receives message at the appointed time,, think that this PW is normal if receive; Otherwise, produce fault warning.
As shown in Figure 2, PW OAM testing process step once is as follows:
Set up PW between (0 prerequisite) PE1 (masters) and the PE2 (passive side), both sides' host software generates forwarding-table item, and is issued to hardware (like this, transmit direct access hardware list item and get final product, no longer access software); On PE1 and PE2, dispose OAM respectively, the PW that sets up is detected;
(1) PE1 starts OAM detection timer, and initiates OAM and detect;
(2) the PE1 host software issues the OAM label and gives hardware, assembling OAM bag;
(3) PE1 sends the OAM bag according to the PW hardware forwarding table;
(4) PE2 receives and analytic message, hands over the OAM hardware module to handle;
(5) PE2 OAM hardware module is analyzed message, hands over OAM package dress resume module;
(6) PE2 assembling OAM bag;
(7) PE2 sends;
(8) PE1 receives, and analytic message hands over the OAM hardware module to handle;
(9) message is submitted host software, finishes one-time detection.
One, following PW OAM masters is handled is specifically described:
(1) function
In order to detect the two-way data-plane connectivity of PW, the OAM message carries out once coming and going on the PW link.The OAM message is sent by masters PE, after coming and going through link, receives at masters PE again.So, the processing of LSP OAM source end and Su Duan is combined in a PE equipment, send in masters, and receive detection in masters.That is: with transmission, reception and testing mechanism directly transplanting, the merging of LSP OAM, just constitute the OAM(Operation Administration Maintenance) of PW masters.
(2) PW-OAM message
The present invention defines a kind of new OAM detection messages: the PW-OAM message, effect is similar to CV, the FFD message of LSPOAM, is used for the PW connected state and detects.The function type of message (FunctionType) is 0x08.Message format is as follows:
| Function Type (0x08) | Reserved |
| 1 byte | 48 bytes |
Whether masters is constantly sent the OAM message by the PW link, and detect the message that sends in this locality and return at the appointed time, thereby determines whether PW breaks down.
(3) PW effective marker position (PW_Avail_Flag)
The present invention is in PW hardware forwarding table (NHLFE), and PW effective marker position one-PW_Avail_Flag of redetermination is used to retrain the forwarding of PW data message.PW hardware forwarding table form is as follows:
| NHLFE-id | PW Label | LSP Label | …… | PW_Avail_Flag |
| …… | ||||
| …… |
If PW_Avail_Flag equals 1, then PW is effective, and data can normally be transmitted; Otherwise expression PW breaks down, and abandons the data forwarding message.This flag bit is controlled by testing result, when detection PW breaks down, with this mark position 0, stops data forwarding; Otherwise, recover just often when detecting PW, then, data are normally transmitted with this mark position 1.
Attention: PW_Avail_Flag only retrains the data message of non-OAM, for the OAM message, this sign is meaningless, promptly this sign can not be controlled the OAM message forwarding (because the OAM message is also inquired about this table and transmitted, if PW_Avail_Flag influences the OAM message forwarding, then flag bit can't put 1).
Two, following PW OAM passive side is handled is specifically described:
(1) the reverse forwarding of PW-OAM message
Comprise 3 layers of label in the OAM message of PW, outermost layer is used for LSP to be transmitted, and middle one deck is used for PW to be transmitted, and the innermost layer label should be the OAM label: 14, and PW OAM message format is as follows:
| Link layer | The LSP label | The PW label | OAM label (14) | The PW-OAM message |
LSP OAM does POP (popping) operation at Su Duan with the LSP forwarding label, again with label 14 POP, hands over the OAM resume module, finally detects at host software.But PW OAM here detects, but will with the OAM message again loopback give masters.Therefore, the passive side receives the OAM message, and the LSP label is still done POP operation, and the PW label then will carry out SWAP (replacements) to be operated, and obtains new PW label and LSP label, and the label by new acquisition is with the loopback of OAM message.Here claim that this process is the reverse forwarding of PWOAM.The OAM detection method that the present invention uses, testing process and ping class of operation are exactly the process of " resolving and assembling " in passive side's operation seemingly, comprising: receive, resolve, assemble, transmission.
(2) PW OAM detects sign (OAM_Flag)
In the reverse repeating process of PW OAM, to transmit in order to guarantee high efficiency, all processing of message are all finished by hardware, without any the participation of software.Therefore, behind configuration PW OAM, the passive side must set up the SWAP list item of a cover vpn label, and is issued to hardware, make the passive side receive the OAM message after, can send it back to masters again.
In order to realize reverse forwarding, the present invention adds the OAM flag bit of an OAM_Flag in the ILM of hardware (Incoming Label Map goes into territory label mapping) table, represent whether this PW disposes OAM.If PW disposes OAM, then putting OAM_F is 1; Otherwise be changed to 0, support that the ILM list structure of PW OAM is as follows:
(3) reverse repeating process
In sum, the reverse forwarding of PW OAM is achieved as follows:
When the passive side receives a PW message,, look into the ILM table according to the PW label then at first with outer field LSP label POP.After finding, check the value of OAM_F.
If OAM_F equals 0, show that PW does not dispose OAM, all transmit all normal process;
If OAM_F equals 1, show that PW has disposed OAM, judge one deck label down.If there is one deck label down, and be label at the bottom of the stack, label value equals 14, shows that then catching message is the OAM message, and this OAM message is done the SWAP operation, obtains new LSP label and PW label, re-assemblies the OAM message, sends back to masters.
The present invention provides the service equipment in a kind of packet network simultaneously, as the PE1 among Fig. 2, comprises sending module and receiver module, also comprises the Operations,Administration And Maintenance module (shown in frame of broken lines in the PE1 among Fig. 2) that is connected with receiver module with sending module; The Operations,Administration And Maintenance module sends pseudo-line loop operation by sending module and administers and maintains message; Receiver module is given the Operations,Administration And Maintenance module and is handled after receiving message, if received packet during for the answer Operations,Administration And Maintenance message of the described transmission message received, thinks that the pseudo-circuit between the service equipment is normal in Preset Time.
Service equipment in the another kind of packet network that the present invention provides simultaneously as the PE2 among Fig. 2, comprises sending module and receiver module, also comprises the Operations,Administration And Maintenance module (shown in frame of broken lines in the PE2 among Fig. 2) that is connected with sending module; Receiver module receives pseudo-line loop operation and administers and maintains message, gives the Operations,Administration And Maintenance module and handles; The Operations,Administration And Maintenance module administers and maintains message with pseudo-line loop operation and returns to transmit leg by sending module.
Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalence that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (10)
1, judge the method for pseudo wire connection state in a kind of packet network, it is characterized in that may further comprise the steps:
Increase pseudo-line loop operation and administer and maintain message, be used for pseudo-circuit connected state and detect; Wherein, described pseudo-line loop operation administers and maintains message and comprises three layers of label, and outermost layer is the label switched path label, and the centre is pseudo-circuit label, and innermost layer is the Operations,Administration And Maintenance special tags;
The local terminal service equipment sends described pseudo-line loop operation and administers and maintains message, and the opposite end service equipment receives after described pseudo-line loop operation administers and maintains message, replys corresponding pseudo-line loop operation and administers and maintains message;
In Preset Time, receive the message of described answer when the local terminal service equipment after, think that the pseudo-circuit between the service equipment is normal.
2, judge the method for pseudo wire connection state in the packet network according to claim 1, it is characterized in that: service equipment constantly sends pseudo-line loop operation by pseudo-line link and administers and maintains message, and detect the message that sends and whether in the default time, return, determine whether pseudo-circuit breaks down.
3, judge the method for pseudo wire connection state in the packet network according to claim 2, it is characterized in that: pseudo-circuit effective marker position is set in pseudo-circuit hardware forwarding table, be used for the bound data message forwarding, described pseudo-circuit effective marker position is controlled by the result whether pseudo-circuit of described detection breaks down, represent that pseudo-circuit is effective during this flag bit set, data message can normally be transmitted; Otherwise do not transmit.
4, judge the method for pseudo wire connection state in the packet network according to claim 3, it is characterized in that: described opposite end service equipment receives after described pseudo-line loop operation administers and maintains message, pseudo-circuit label is carried out replacement operation, obtain new pseudo-circuit label, the label by new acquisition administers and maintains message with pseudo-line loop operation and is transmitted back to local terminal.
5, judge the method for pseudo wire connection state in the packet network according to claim 4, it is characterized in that: described opposite end service equipment is set up the replacement list item of vpn label, and be issued to hardware, it is received after described pseudo-line loop operation administers and maintains message, can carry out the replacement of pseudo-circuit label.
6, judge the method for pseudo wire connection state in the packet network according to claim 4, it is characterized in that: comprise three layers of label in the Operations,Administration And Maintenance message of described pseudo-circuit, outermost layer is the label switched path label, the centre is pseudo-circuit label, and innermost layer is the Operations,Administration And Maintenance special tags; The opposite end service equipment receives after described pseudo-line loop operation administers and maintains message, and described label switched path label is made stack operation, and described pseudo-circuit label is carried out replacement operation.
7, judge the method for pseudo wire connection state in the packet network according to claim 3, it is characterized in that: add the Operations,Administration And Maintenance flag bit in going into territory label mapping table, whether the corresponding pseudo-circuit of expression configuring operation management and maintenance function.
8, judge the method for pseudo wire connection state in the packet network according to claim 7, it is characterized in that: described opposite end service equipment receives that treatment step comprised when pseudo-line loop operation administered and maintained message:
Outer field label switched path label is popped, look into the described territory label mapping table of going into according to pseudo-circuit label then, check described Operations,Administration And Maintenance flag bit;
Judge pseudo-circuit whether configuring operation management and maintenance function according to described Operations,Administration And Maintenance flag bit, if do not have, then all transmit all normal process; If pseudo-circuit is configuring operation management and maintenance function, then judge one deck label down;
If there is one deck label down, and be label at the bottom of the stack, label value equals 14, show that then catching message is that pseudo-line loop operation administers and maintains message, this Operations,Administration And Maintenance message is done replacement operation, obtain new label switched path label and pseudo-circuit label, re-assembly pseudo-line loop operation and administer and maintain message, send it back described local terminal service equipment.
9, the service equipment in a kind of packet network comprises sending module and receiver module, it is characterized in that: also comprise the Operations,Administration And Maintenance module that is connected with receiver module with described sending module;
Described Operations,Administration And Maintenance module sends pseudo-line loop operation by described sending module and administers and maintains message to the opposite end service equipment; Wherein, described pseudo-line loop operation administers and maintains message and comprises three layers of label: outermost layer is the label switched path label, and the centre is pseudo-circuit label, and innermost layer is the Operations,Administration And Maintenance special tags;
After described receiver module receives message, giving described Operations,Administration And Maintenance module handles, if during the answer Operations,Administration And Maintenance message of the transmission message that received packet sends for the described opposite end service equipment of receiving, think that the pseudo-circuit between the service equipment is normal in Preset Time.
10, the service equipment in a kind of packet network comprises sending module and receiver module, it is characterized in that: also comprise the Operations,Administration And Maintenance module that is connected with described sending module;
Described receiver module receives pseudo-line loop operation and administers and maintains message, giving described Operations,Administration And Maintenance module handles, wherein, described pseudo-line loop operation administers and maintains message and comprises three layers of label: outermost layer is the label switched path label, the centre is pseudo-circuit label, and innermost layer is the Operations,Administration And Maintenance special tags;
Described Operations,Administration And Maintenance module administers and maintains message with described pseudo-line loop operation and returns to transmit leg by described sending module.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100331442A CN100484097C (en) | 2006-01-17 | 2006-01-17 | Method for judging pseudo wire connection state in packet-switching network and service apparatus thereof |
| AT06791219T ATE461572T1 (en) | 2006-01-17 | 2006-10-09 | METHOD AND DEVICES FOR ASSESSING THE PW CONNECTION STATE AND FOR COMMUNICATING THE AC CONNECTION STATUS |
| DE602006013047T DE602006013047D1 (en) | 2006-01-17 | 2006-10-09 | METHOD AND DEVICE FOR ASSESSING THE PW CONNECTION CONDITION AND FOR INDICATING THE AC CONNECTION CONDITION |
| EP06791219A EP1978681B1 (en) | 2006-01-17 | 2006-10-09 | Methods and devices for judging pw connection state and notifying ac connection state |
| PCT/CN2006/002637 WO2007082429A1 (en) | 2006-01-17 | 2006-10-09 | Methods and devices for judging pw connection state and notifying ac connection state |
| US12/174,503 US20080273467A1 (en) | 2006-01-17 | 2008-07-16 | Methods for determining pw connection state and for notifying ac connection state and the associated equipments |
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| CNB2006100331442A CN100484097C (en) | 2006-01-17 | 2006-01-17 | Method for judging pseudo wire connection state in packet-switching network and service apparatus thereof |
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| CN100484097C true CN100484097C (en) | 2009-04-29 |
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| Pseudowire Setup and Maintenance using the Label Distribution Protocol Draft-ietf-pwe3-control-protocol-17.txt. Luca Martini, Eric C.Rosen, Nasser El-Aawar,Toby Smith,Giles Heron.Network Working Group Internet Draft. 2005 * |
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