CN102185780A - Operation, administration and maintenance (OAM) message processing method and device - Google Patents
Operation, administration and maintenance (OAM) message processing method and device Download PDFInfo
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Abstract
The invention discloses an operation, administration and maintenance (OAM) message processing method and an OAM message processing device. The method comprises the following steps of: resolving a received message, determining the message is an OAM message, and acquiring the encapsulation information of a connectivity fault management (CFM) message corresponding to the OAM message; and restructuring the OAM message according to the encapsulation information into the CFM message. By the technical scheme provided by the invention, the reception of tunnel-and-pseudo-wire-related OAM message in a multi-protocol label switching-transport profile (MPLS-TP) is realized, the consumption of system resources is reduced, and the system processing complexity is reduced.
Description
Technical field
The present invention relates to field of mobile communication, particularly relate to a kind of operation management maintain (Operation, Administration and Maintenance abbreviates OAM as) message processing method and device.
Background technology
Connectivity fault management (Connectivity Fault Management, abbreviate CFM as) be by (the Institute of Electrical and Electronics Engineers of IEEE-USA, abbreviate IEEE as) definition a kind of two layers of Ethernet OAM agreement, support telecommunication standards tissue (the ITU-T for ITU Telecommunication Standardization Sector of International Telecommunications Union, abbreviate ITU-T as) defined OAM standard, the CFM message is two layers of ether bag, and feature is that EtherType number is 0x8902.On the forwarding chip of receiving terminal, be 0x8902 if be resolved to the EtherType of a message, then this message will carry out the handling process of CFM message.Because CFM supports the OAM standard of ITU-T definition, so (Protocol Data Unit, PDU) content adopts the OAM data format of ITU-T definition to the protocol Data Unit of CFM message.
Connectivity detect-message (Connectivity Check Message abbreviates CCM as) is of paramount importance a kind of in the CFM message, and the test side regularly sends the connectedness of CCM message in order to announcement opposite end link.
Multiprotocol label switching-extensive documentation (Multi-Protocol Label Switching-Transport Profile, abbreviate MPLS-TP as) be by internet engineering task group (Internet Engineering Task Force, abbreviate IETF as) and ITU-T unite the standard of appointment, be a kind of connection-oriented packet switching network technology.Utilize the MPLS label switched path, save MPLS signaling and procotol (Internet Protocol abbreviates IP as) sophisticated functions, support multiple service supporting, be independent of client layer and chain of command, and can run on various physical-layer techniques.
MPLS-TP also satisfies the hierarchy of ITU-T G805 definition as connection-oriented transmission network technology, and the MPLS-TP network can be divided into: section layer (TMS), channel layer (TMP) and passage layers (TMC).
The more concern network sides of MPLS-TP OAM testing mechanism is supported in the tunnel of TMP layer with in the detection of the pseudo-line (Pseudo Wire abbreviates PW as) of TMC layer.MPLS-TP OAM also adopts the OAM standard of ITU-T definition, and PDU adopts the Y.1731 form of definition at present.
On the bearer network edge device, need realize CFM and MPLS-TP OAM simultaneously usually, wherein, the CFM message is realized double layer network is detected, and MPLS-TP OAM message is realized the detection to TMP and TMC.In the prior art, the detection messages of two kinds of forms has different reception handling processes, consumes a large amount of system resource, increases the complexity of system handles simultaneously.
Summary of the invention
The invention provides a kind of OAM message processing method and device, with the message that solves two kinds of forms of CFM and MPLS-TP OAM in the prior art different reception handling processes is arranged, thereby consume a large amount of system resource, increase the problem of the complexity of system handles simultaneously.
The invention provides a kind of OAM message processing method, comprising:
The message that receives is resolved, determine that message is the OAM message, and obtain the packaging information of the connectivity fault management CFM message of OAM message correspondence;
According to packaging information the OAM message is recombinated, the OAM message is reassembled as the CFM message.
The present invention also provides a kind of OAM message process device, comprising:
The packet parsing module is used for the message that receives is resolved, and determines that message is the OAM message, and obtains the packaging information of the connectivity fault management CFM message of OAM message correspondence;
The message recombination module is used for according to packaging information the OAM message being recombinated, and the OAM message is reassembled as the CFM message.
Beneficial effect of the present invention is as follows:
By the MPLS-TP OAM message that receives is reassembled as the CFM message, utilize original CFM message to receive flow process and receive the OAM message, solved that the message of two kinds of forms of CFM and MPLS-TP OAM has different reception handling processes in the prior art, thereby consume a large amount of system resource, increase the problem of the complexity of system handles simultaneously, can make full use of existing CFM message and receive flow process, realized among the MPLS-TP reception about the OAM message of tunnel and PW, reduced the consumption of system resource, simplified the complexity of system handles, in addition, utilize the present invention realizing the carrying out function expansion in the system that ether OAM or CFM detect originally, because the present invention does not make any modification to CFM mechanism, so can very conveniently finish function upgrading fast; And, for example, only support the processor chips of CFM for the network processor chip of forwarding plane function limitation, can reduce R﹠D costs according to technical scheme expensive chip function of the present invention.
Description of drawings
Fig. 1 is the structural representation of the OAM message process device of the embodiment of the invention;
Fig. 2 is the preferred structure schematic diagram of the OAM message process device of the embodiment of the invention;
Fig. 3 is the flow chart of the OAM message processing method of the embodiment of the invention;
Fig. 4 is the detailed process flow chart of the OAM message processing method of the embodiment of the invention.
Embodiment
For the message that solves two kinds of forms of CFM and MPLS-TP OAM in the prior art has different reception handling processes, thereby consume a large amount of system resource, increase the problem of the complexity of system handles simultaneously, the invention provides a kind of OAM message processing method and device, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, does not limit the present invention.
Device embodiment
According to embodiments of the invention, a kind of OAM message process device is provided, Fig. 1 is the structural representation of the OAM message process device of the embodiment of the invention, as shown in Figure 1, OAM message process device according to the embodiment of the invention comprises: packet parsing module 10 and message recombination module 12 below are described in detail each module of the embodiment of the invention.
Particularly, packet parsing module 10 specifically is used for:
1, the message that receives is resolved, determine whether message carries control word;
If 2 messages carry control word, then determine according to the concrete numerical value of control word whether message is the OAM message;
3, determine the type of message of OAM message according to the label of OAM message;
4, obtain the MEG index of the MEG that the OAM message detected according to the type of message of the label of OAM message and OAM message;
5, table look-up according to the MEG index, obtain the packaging information of corresponding CFM message;
That is to say that packet parsing module 10 at first needs the message of receiving is resolved, distinguish MPLS-TP OAM message or other messages, if MPLS-TP OAM message, what further determine detection PW still is the OAM message that detects the tunnel.Simultaneously packet parsing module 10 goes back that certain content is to the mapping relations of Maintenance Entity (Maintenance Entity Group abbreviates MEG as) index (MEGINDEX) in the maintenance packet, and wherein, MEG INDEX is the unique identification of MEG on equipment.
Particularly, message recombination module 12 specifically is used for:
1, peels off in the OAM message all the elements before the protocol Data Unit PDU, and add and go up two layers of new head;
2, determine the purpose MAC of CFM message according to the MEG rank in the packaging information, determine the VLAN of CFM message according to the sign of the VLAN in the packaging information, and, form the CFM message after the reorganization according to the Ethernet protocol of CFM message corresponding protocols number definite CFM message number.
That is to say that message recombination module 12 is recombinated to MPLS-TP OAM message according to the OAM message format that detects tunnel and PW respectively when MPLS-TP OAM message is recombinated, and keeps OAM PDU, message reassembles into the CFM message the most at last.
Preferably, the OAM message process device according to the embodiment of the invention also comprises:
The CFM message processing module (MPM) is used for the CFM message is received processing, and certain safeguards the pairing CFM message of associating end points MEP among the Maintenance Entity MEG if do not receive in the given time, then produces corresponding warning information.
Particularly, producing corresponding warning information is that the CFM message processing module (MPM) specifically is used for: according to the MEP sign and the MEG index that produce alarm, table look-up and obtain the keyword of tunnel Taoist monastic name or pseudo-line PW, produce warning information according to tunnel Taoist monastic name or keyword.
That is to say that the CFM message processing module (MPM) need be handled the CFM message of receiving.If do not receive certain remote maintenance associating end points (Maintenance Association End Points in the some cycles, abbreviate MEP as) (Remote MEP), will produce alarm, wherein, Remote MEP refers to the detection end points relative with MPLS-TP OAM message sink.
Be elaborated below in conjunction with the operation of accompanying drawing to above-mentioned each module of the embodiment of the invention.Fig. 2 is the preferred structure schematic diagram of the OAM message process device of the embodiment of the invention, as shown in Figure 2, comprising: packet parsing module 20, message recombination module 22, CFM message processing module (MPM) 23.Particularly:
The message of 20 pairs of all access arrangements of packet parsing module is resolved, whether be with control word (MPLS-TP OAM message has 4 byte control words after label He before the packet) according to the MPLS message, and the concrete numerical value of control word judges whether it is MPLS-TP OAM message, if the MPLS-TPOAM message further judges it is the OAM message of which kind of type with label, if skin is a tunnel label, the second layer is 13 labels, then thinks to detect the MPLS-TP OAM message in tunnel; If skin is tunnel label or LDP label, the second layer is the PW label, then thinks to detect the MPLS-TPOAM message of PW.Table look-up with tunnel label or PW label and can obtain the MEG INDEX of MPLS-TP OAM MEG that message detects.Table look-up with MEG INDEX again, can obtain the packaging information of corresponding CFM message.
The packaging information that message recombination module 22 obtains according to packet parsing module 10 is recombinated to message.No matter be to detect the MPLS-TP OAM message tunnel or that detect PW, at first peel off OAM PDU all the elements before, add two layers of new head then, message is revised as a common two layer message.Purpose MAC fills in multicast MAC 0x01-80-C2-00-00-3X, and wherein, " X " fills out the maintenance entity grade (Maintenance Entity Level abbreviates MEL as) of MEG correspondence; VLAN (Virtual Local Area Network abbreviates VLAN as) ID fills out the VLAN ID that obtains in the MEG packaging information; The ether protocol number is with 0x8902 (CFM message corresponding protocols number); Keep original PDU, form a complete CFM message.Need to prove, the VLAN that on behalf of the CFM message, above-mentioned VLAN detected, but only between internal module, transmit utilization, and be not present in the real network, can be referred to as inner VLAN.
CFM message processing module (MPM) 23 is responsible for receiving and is handled the CFM message, if do not receive the CFM message of certain Remote MEP in the some cycles, then produces alarm announcement upper layer software (applications) fault and takes place.Preferably, CFM message processing module (MPM) 23 can be taken the upper layer software (applications) module to from warning information by the table look-up keyword (tunnel Taoist monastic name) that obtains the tunnel or the keyword (PW ID) of PW of the Remote MEP information that produces alarm.Wherein, Remote MEP information comprises: Remote MEP ID and MEG INDEX.
The embodiment of the invention fully takes into account CFM and MPLS-TP OAM common ground, promptly all support the OAM standard of ITU-T definition, utilize original CFM to receive flow process and receive MPLS-TP OAM message, and utilize the original alarm processing of CFM to realize the fault warning of tunnel or PW.Utilize the embodiment of the invention can in the system that realized ether OAM and/or CFM detection originally, carry out the function expansion, so can very conveniently finish function upgrading fast; And, can reduce R﹠D costs according to the technical scheme expensive chip function of the embodiment of the invention for the network processor chip of forwarding plane function limitation.
Method embodiment
According to embodiments of the invention, a kind of OAM message processing method is provided, Fig. 3 is the flow chart of the OAM message processing method of the embodiment of the invention, as shown in Figure 3, comprises following processing according to the OAM message processing method of the embodiment of the invention:
Step 301 is resolved the message that receives, and determines that message is the OAM message, and obtains the packaging information of the connectivity fault management CFM message of OAM message correspondence; Wherein, packaging information comprises: the MEG rank of MEG correspondence and virtual LAN VLAN sign;
In step 301, the message that receives is being resolved, when determining that message is the OAM message, specifically need carry out following processing:
1, the message that receives is resolved, determine whether message carries control word;
If 2 messages carry control word, then determine according to the concrete numerical value of control word whether message is the OAM message.
In step 301, when the packaging information of the connectivity fault management CFM message that obtains OAM message correspondence, specifically need carry out following processing:
The packaging information of obtaining the connectivity fault management CFM message of OAM message correspondence specifically comprises:
1, determines the type of message of OAM message according to the label of OAM message;
2, obtain the MEG index of the MEG that the OAM message detected according to the type of message of the label of OAM message and OAM message;
3, table look-up according to the MEG index, obtain the packaging information of corresponding CFM message.
Step 302 is recombinated to the OAM message according to packaging information, and the OAM message is reassembled as the CFM message.
In step 302, specifically need carry out following processing:
1, peels off in the OAM message all the elements before the protocol Data Unit PDU, and add and go up two layers of new head;
2, determine the purpose MAC of CFM message according to the MEG rank in the packaging information, determine the VLAN of CFM message according to the sign of the VLAN in the packaging information, and, form the CFM message after the reorganization according to the Ethernet protocol of CFM message corresponding protocols number definite CFM message number.
Preferably, after step 302, can also carry out following processing: the CFM message is received processing, and certain safeguards the pairing CFM message of associating end points MEP among the Maintenance Entity MEG if do not receive in the given time, then produces corresponding warning information.Wherein, when producing corresponding warning information, need table look-up and obtain the keyword of tunnel Taoist monastic name or pseudo-line PW, produce warning information according to tunnel Taoist monastic name or keyword according to the MEP sign and the MEG index that produce alarm.
Below in conjunction with accompanying drawing, the technical scheme of the embodiment of the invention is described in detail.Fig. 4 is the detailed process flow chart of the OAM message processing method of the embodiment of the invention, as shown in Figure 4, comprises following processing:
Step 401, packet parsing module receive the slave unit port and send next message to.
Step 402, the packet parsing module is resolved message, according to whether being control word behind MPLS message and the MPLS label, determines whether this message is MPLS-TP OAM message.If not MPLS-TP OAM message, enter step 403; If MPLS-TP OAM message enters step 404.
Step 403, other messages are handled.
Step 404, it is the MPLS-TP OAM message of which kind of type that the packet parsing module is further judged, if skin is a tunnel label, the second layer is 13 labels, then thinks to detect the MPLS-TP OAM message in tunnel, enters step 406; If skin is tunnel label or LDP label, the second layer is the PW label, then thinks to detect the MPLS-TP OAM message of PW, enters step 405.
Step 405, packet parsing module 101 usefulness PW labels are tabled look-up, and obtain the MEG INDEX of MPLS-TP OAM MEG that message detects.Enter step 407.
Step 406, the packet parsing module is tabled look-up with tunnel label, obtains the MEG INDEX of MPLS-TP OAM MEG that message detects.Enter step 407.
Step 407, the MEG INDEX that the packet parsing module is obtained with previous step tables look-up, and obtains CFM message packaging information, specifically comprises MEL and " the inner VLAN " of MEG correspondence.
Step 408, the message recombination module is recombinated to MPLS-TP OAM message, and concrete behavior comprises: at first peel off OAM PDU all the elements before; Add two layers of new head then, purpose MAC fills out multicast MAC 0x01-80-C2-00-00-3X, and wherein, " X " fills out the MEL (scope 0-7) that obtains in the step 407, and VLAN fills out " the inner VLAN " that obtains in the step 407; Ether protocol number 0x8902; Keep original PDU, finally form a complete CFM message.Enter step 409.
The CFM message that will form after step 409, message recombination module will be recombinated sends to the CFM message processing module (MPM).Enter step 410.
Step 410, the CFM message processing module (MPM) receives processing to the CFM message.If do not receive the CFM message of certain Remote MEP in the some cycles, then produce alarm announcement upper layer software (applications) fault and take place.And can table look-up by the Remote MEP information that produces alarm and obtain the keyword in tunnel, the keyword (PW ID) that is tunnel Taoist monastic name or PW takes the upper layer software (applications) module to from warning information, wherein, RemoteMEP information comprises: Remote MEP ID+MEG INDEX.
In sum, the embodiment of the invention is by being reassembled as the CFM message to the MPLS-TP OAM message that receives, utilize original CFM message to receive flow process and receive the OAM message, solved that the message of two kinds of forms of CFM and MPLS-TP OAM has different reception handling processes in the prior art, thereby consume a large amount of system resource, increase the problem of the complexity of system handles simultaneously, can make full use of existing CFM message and receive flow process, realized among the MPLS-TP reception about the OAM message of tunnel and PW, reduced the consumption of system resource, simplify the complexity of system handles, and utilized the original alarm processing of CFM to realize the fault warning of tunnel or PW.In addition, utilize the present invention can in the system that realized ether OAM or CFM detection originally, carry out the function expansion, because the present invention does not make any modification to CFM mechanism, so can very conveniently finish function upgrading fast; And, for example, only support the processor chips of CFM for the network processor chip of forwarding plane function limitation, can reduce R﹠D costs according to technical scheme expensive chip function of the present invention.
Although be the example purpose, the preferred embodiments of the present invention are disclosed, it also is possible those skilled in the art will recognize various improvement, increase and replacement, therefore, scope of the present invention should be not limited to the foregoing description.
Claims (10)
1. an operation management maintain OAM message processing method is characterized in that, comprising:
The message that receives is resolved, determine that described message is the OAM message, and obtain the packaging information of the connectivity fault management CFM message of described OAM message correspondence;
According to described packaging information described OAM message is recombinated, described OAM message is reassembled as described CFM message.
2. the method for claim 1 is characterized in that, the message that receives is resolved, and determines that described message is that the OAM message specifically comprises:
The described message that receives is resolved, determine whether described message carries control word;
If described message carries described control word, then determine according to the concrete numerical value of described control word whether described message is described OAM message.
3. the method for claim 1 is characterized in that, the packaging information of obtaining the connectivity fault management CFM message of described OAM message correspondence specifically comprises:
Determine the type of message of described OAM message according to the label of described OAM message;
Obtain the MEG index of the Maintenance Entity MEG that described OAM message detected according to the type of message of the label of described OAM message and described OAM message;
Table look-up according to described MEG index, obtain the packaging information of corresponding CFM message.
4. method as claimed in claim 3 is characterized in that, described packaging information comprises: the MEG rank of described MEG correspondence and virtual LAN VLAN sign;
According to described packaging information described OAM message is recombinated, described OAM message is reassembled as described CFM message specifically comprises:
Peel off in the described OAM message all the elements before the protocol Data Unit PDU, and add and go up two layers of new head;
Determine the purpose MAC of described CFM message according to the described MEG rank in the described packaging information, determine the VLAN of described CFM message according to the described VLAN sign in the described packaging information, and determine the Ethernet protocol number of described CFM message according to described CFM message corresponding protocols number, form the described CFM message after the reorganization.
5. the method for claim 1 is characterized in that, described method also comprises:
Described CFM message is received processing, and certain safeguards the pairing CFM message of associating end points MEP among the MEG if do not receive in the given time, then produces corresponding warning information.
6. method as claimed in claim 5 is characterized in that, the corresponding warning information of described generation specifically comprises:
According to the MEP sign and the MEG index that produce alarm, table look-up and obtain the keyword of tunnel Taoist monastic name or pseudo-line PW, produce described warning information according to described tunnel Taoist monastic name or described PW keyword.
7. an Operation Administration and Maintenance OAM message process device is characterized in that, comprising:
The packet parsing module is used for the message that receives is resolved, and determines that described message is the OAM message, and obtains the packaging information of the connectivity fault management CFM message of described OAM message correspondence;
The message recombination module is used for according to described packaging information described OAM message being recombinated, and described OAM message is reassembled as described CFM message.
8. device as claimed in claim 7 is characterized in that, described device also comprises:
The CFM message processing module (MPM) is used for described CFM message is received processing, and certain safeguards the pairing CFM message of associating end points MEP among the Maintenance Entity MEG if do not receive in the given time, then produces corresponding warning information.
9. device as claimed in claim 8 is characterized in that:
Described packet parsing module specifically is used for:
The described message that receives is resolved, determine whether described message carries control word;
If described message carries described control word, then determine according to the concrete numerical value of described control word whether described message is described OAM message;
Determine the type of message of described OAM message according to the label of described OAM message;
Obtain the MEG index of the MEG that described OAM message detected according to the described type of message of the label of described OAM message and described OAM message;
Table look-up according to described MEG index, obtain the packaging information of corresponding CFM message;
Described CFM message processing module (MPM) specifically is used for:
According to the MEP sign and the MEG index that produce alarm, table look-up and obtain the keyword of tunnel Taoist monastic name or pseudo-line PW, produce described warning information according to described tunnel Taoist monastic name or described PW keyword.
10. device as claimed in claim 9 is characterized in that, described packaging information comprises: the MEG rank of described MEG correspondence and virtual LAN VLAN sign;
Described message recombination module specifically is used for:
Peel off in the described OAM message all the elements before the protocol Data Unit PDU, and add and go up two layers of new head;
Determine the purpose MAC of described CFM message according to the described MEG rank in the described packaging information, determine the VLAN of described CFM message according to the described VLAN sign in the described packaging information, and determine the Ethernet protocol number of described CFM message according to described CFM message corresponding protocols number, form the described CFM message after the reorganization.
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| CN109525451B (en) * | 2018-09-13 | 2021-06-01 | 中兴通讯股份有限公司 | Method, device, network equipment and controller for realizing MPLS network detection |
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