CN102185780B - OAM message processing method and device - Google Patents
OAM message processing method and device Download PDFInfo
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- CN102185780B CN102185780B CN201110122326.8A CN201110122326A CN102185780B CN 102185780 B CN102185780 B CN 102185780B CN 201110122326 A CN201110122326 A CN 201110122326A CN 102185780 B CN102185780 B CN 102185780B
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Abstract
The invention discloses a kind of OAM message processing method and device.The method comprises: resolve the message received, and determines that message is OAM message, and obtains the packaging information of connectivity fault management CFM message corresponding to OAM message; According to packaging information, OAM message is recombinated, OAM message is reassembled as CFM message.By means of technical scheme of the present invention, achieve the reception about the OAM message of tunnel and PW in MPLS-TP, decrease the consumption of system resource, simplify the complexity of system process.
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, referred to as OAM) message processing method and device.
Background technology
Connectivity fault management (Connectivity Fault Management, referred to as CFM) be by IEEE-USA (Institute of Electrical and Electronics Engineers, referred to as IEEE) one two layers of Ethernet OAM agreement of defining, support International Telecommunication Union telecommunication standardsization tissue (ITU-T for ITU Telecommunication Standardization Sector, referred to as ITU-T) the OAM standard that defines, CFM message is two layers of ether bag, feature is EtherType number is 0x8902.On the forwarding chip of receiving terminal, if the EtherType being resolved to a message is 0x8902, then this message will carry out the handling process of CFM message.Because CFM supports the OAM standard of ITU-T definition, so the protocol Data Unit of CFM message (Protocol Data Unit, PDU) content adopts the OAM data form of ITU-T definition.
Connectivity detect-message (Connectivity Check Message, referred to as CCM) is of paramount importance one in CFM message, and test side regularly sends CCM message in order to notice the connectedness of opposite end link.
Multiprotocol label switching-extensive documentation (Multi-Protocol Label Switching-TransportProfile, referred to as MPLS-TP) be by internet engineering task group (Internet Engineering TaskForce, referred to as IETF) and ITU-T combine the standard of specifying, be a kind of connection-oriented packet switching network technology.Utilize MPLS label switching path, save MPLS signaling and procotol (InternetProtocol, referred to as IP) sophisticated functions, support multiple service supporting, independent of client layer and chain of command, and various physical-layer techniques can be run on.
MPLS-TP is as connection-oriented transport network technology, and also meet the hierarchy that ITU-T G805 defines, MPLS-TP network can be divided into: section layer (TMS), channel layer (TMP) and passage layers (TMC).
MPLS-TP OAM more concern network sides testing mechanism, supports the detection in the tunnel of TMP layer and the pseudo-line (Pseudo Wire, referred to as PW) at TMC layer.The OAM standard that MPLS-TP OAM also adopts ITU-T to define, current PDU adopts the form Y.1731 defined.
On bearer network edge device, usually need to realize CFM and MPLS-TP OAM, wherein, CFM message realizes detecting double layer network, and MPLS-TP OAM message realizes the detection to TMP and TMC simultaneously.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 process simultaneously.
Summary of the invention
The invention provides a kind of OAM message processing method and device, have different reception handling processes with the message solving CFM and MPLS-TP OAM two kinds of forms in prior art, thus consume a large amount of system resource, increase the problem of the complexity of system process simultaneously.
The invention provides a kind of OAM message processing method, comprising:
The message received is resolved, determines that message is OAM message, and obtain the packaging information of connectivity fault management CFM message corresponding to OAM message;
According to packaging information, OAM message is recombinated, OAM message is reassembled as CFM message.
Present invention also offers a kind of OAM message processing unit, comprising:
Packet parsing module, for resolving the message received, determines that message is OAM message, and obtains the packaging information of connectivity fault management CFM message corresponding to OAM message;
Packet reassembling module, for recombinating to OAM message according to packaging information, is reassembled as CFM message by OAM message.
Beneficial effect of the present invention is as follows:
By being reassembled as CFM message to the MPLS-TP OAM message received, original CFM message is utilized to receive flow process to receive OAM message, the message solving CFM and MPLS-TP OAM two kinds of forms in prior art has different reception handling processes, thus consume a large amount of system resource, increase the problem of the complexity of system process simultaneously, existing CFM message can be made full use of and receive flow process, achieve the reception about the OAM message of tunnel and PW in MPLS-TP, decrease the consumption of system resource, simplify the complexity of system process, in addition, utilize the present invention can carry out Function Extension in the system originally realizing ether OAM or CFM detection, because the present invention does not make any amendment to CFM mechanism, so very conveniently function upgrading can be completed fast, and for the network processor chip of forwarding plane function limitation, such as, only support the processor chips of CFM, according to technical scheme expensive chip function of the present invention, R&D costs can be reduced.
Accompanying drawing explanation
Fig. 1 is the structural representation of the OAM message processing unit of the embodiment of the present invention;
Fig. 2 is the preferred structure schematic diagram of the OAM message processing unit of the embodiment of the present invention;
Fig. 3 is the flow chart of the OAM message processing method of the embodiment of the present invention;
Fig. 4 is the detailed process figure of the OAM message processing method of the embodiment of the present invention.
Embodiment
In order to the message solving CFM and MPLS-TP OAM two kinds of forms in prior art has different reception handling processes, thus consume a large amount of system resource, increase the problem of the complexity of system process 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, do not limit the present invention.
Device embodiment
According to embodiments of the invention, provide a kind of OAM message processing unit, Fig. 1 is the structural representation of the OAM message processing unit of the embodiment of the present invention, as shown in Figure 1, OAM message processing unit according to the embodiment of the present invention comprises: packet parsing module 10 and Packet reassembling module 12, be described in detail the modules of the embodiment of the present invention below.
Packet parsing module 10, for resolving the message received, determines that message is OAM message, and obtains the packaging information of connectivity fault management CFM message corresponding to OAM message; Wherein, packaging information comprises: the MEG rank that MEG is corresponding and virtual LAN VLAN mark;
Particularly, packet parsing module 10 specifically for:
1, the message received is resolved, determine whether message carries control word;
If 2 messages carry control word, then whether be OAM message according to the concrete numerical value determination message of control word;
3, according to the type of message of the label determination OAM message of OAM message;
4, the MEG index of the MEG that OAM message detects is obtained according to the label of OAM message and the type of message of OAM message;
5, table look-up according to MEG index, obtain the packaging information of corresponding CFM message;
That is, first packet parsing module 10 needs the message to receiving to resolve, and distinguishes MPLS-TP OAM message or other messages, if MPLS-TP OAM message, determines the OAM message detecting PW or detect tunnel further.Simultaneously packet parsing module 10 to go back in maintenance packet certain content to Maintenance Entity (Maintenance Entity Group, referred to as MEG) mapping relations of index (MEGINDEX), wherein, MEG INDEX is the unique identification of MEG on equipment.
Packet reassembling module 12, for recombinating to OAM message according to packaging information, is reassembled as CFM message by OAM message.
Particularly, Packet reassembling module 12 specifically for:
1, to peel off in OAM message all the elements before protocol Data Unit PDU, and add upper two layers of new head;
2, the object MAC of CFM message is determined according to the MEG rank in packaging information, the VLAN of CFM message is determined according to the VLAN mark in packaging information, and the protocol number corresponding according to CFM message determines the Ethernet protocol number of CFM message, form the CFM message after restructuring.
That is, Packet reassembling module 12, when MPLS-TP OAM message being recombinated, is recombinated to MPLS-TP OAM message according to the OAM message form detecting tunnel and PW respectively, and retain OAM PDU, Packet reassembling becomes CFM message the most at last.
Preferably, also comprise according to the OAM message processing unit of the embodiment of the present invention:
CFM message processing module (MPM), for carrying out reception process to CFM message, if do not received in the given time in Maintenance Entity MEG, certain safeguards the CFM message corresponding to associating end points MEP, then produce corresponding warning information.
Particularly, producing corresponding warning information is, CFM message processing module (MPM) specifically for: according to the MEP mark and the MEG index that produce alarm, table look-up and obtain the keyword in tunnel number or pseudo-line PW, produce warning information according to tunnel number or keyword.
That is, CFM message processing module (MPM) needs to process the CFM message received.If do not receive certain remote maintenance associating end points (Maintenance Association EndPoints in some cycles, referred to as MEP) (Remote MEP), alarm will be produced, wherein, Remote MEP refers to the detection end points relative with MPLS-TP OAM message receiving terminal.
Be described in detail below in conjunction with the operation of accompanying drawing to the above-mentioned modules of the embodiment of the present invention.Fig. 2 is the preferred structure schematic diagram of the OAM message processing unit of the embodiment of the present invention, as shown in Figure 2, comprising: packet parsing module 20, Packet reassembling module 22, CFM message processing module (MPM) 23.Particularly:
The message of packet parsing module 20 to all access arrangements is resolved, control word (MPLS-TP OAM message has 4 byte control words after label He before packet) whether is with according to MPLS message, and the concrete numerical value of control word judges whether it is MPLS-TP OAM message, if MPLS-TPOAM message judges it is the OAM message of which kind of type with label further, if skin is tunnel label, the second layer is 13 labels, then think the MPLS-TP OAM message detecting tunnel; If skin is tunnel label or LDP label, the second layer is PW label, then think the MPLS-TPOAM message detecting PW.With tunnel label or PW label table look-up can obtain MPLS-TP OAM message detect the MEG INDEX of MEG.Table look-up with MEG INDEX again, the packaging information of corresponding CFM message can be obtained.
The packaging information that Packet reassembling module 22 obtains according to packet parsing module 10, recombinates to message.No matter be the MPLS-TP OAM message detecting tunnel or detect PW, first peel off all the elements before OAM PDU, then add two layers of new head, message is revised as a common two layer message.Object MAC fills in multicast MAC 0x01-80-C2-00-00-3X, and wherein, " X " fills out maintenance entity grade corresponding to MEG (Maintenance Entity Level, referred to as MEL); VLAN (Virtual LocalArea Network, referred to as VLAN) ID fills out the VLAN ID obtained from MEG packaging information; Ether protocoll number is with 0x8902 (protocol number that CFM message is corresponding); Retain original PDU, form a complete CFM message.It should be noted that, above-mentioned VLAN represents the VLAN that CFM message detects, but only between internal module, transmits utilization, is not present in real network, can be referred to as inner VLAN.
CFM message processing module (MPM) 23 is responsible for receiving process CFM message, if do not receive the CFM message of certain Remote MEP in some cycles, then produces alarm notice upper layer software (applications) fault and occurs.Preferably, CFM message processing module (MPM) 23 can be tabled look-up and obtains the keyword (tunnel number) in tunnel or the keyword (PW ID) of PW takes upper-layer software module to from warning information by being produced the Remote MEP information of alarm.Wherein, Remote MEP information comprises: Remote MEP ID and MEG INDEX.
The embodiment of the present invention fully takes into account CFM and MPLS-TP OAM common ground, namely the OAM standard that ITU-T defines all is supported, utilize original CFM to receive flow process to 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 present invention can carry out Function Extension, so very conveniently function upgrading can be completed fast in the system originally realizing ether OAM and/or CFM detection; And for the network processor chip of forwarding plane function limitation, according to the technical scheme expensive chip function of the embodiment of the present invention, R&D costs can be reduced.
Embodiment of the method
According to embodiments of the invention, provide a kind of OAM message processing method, Fig. 3 is the flow chart of the OAM message processing method of the embodiment of the present invention, and as shown in Figure 3, the OAM message processing method according to the embodiment of the present invention comprises following process:
Step 301, resolves the message received, and determines that message is OAM message, and obtains the packaging information of connectivity fault management CFM message corresponding to OAM message; Wherein, packaging information comprises: the MEG rank that MEG is corresponding and virtual LAN VLAN mark;
In step 301, resolving the message received, when determining that message is OAM message, concrete needs is handled as follows:
1, the message received is resolved, determine whether message carries control word;
If 2 messages carry control word, then whether be OAM message according to the concrete numerical value determination message of control word.
In step 301, when obtaining the packaging information of connectivity fault management CFM message corresponding to OAM message, concrete needs is handled as follows:
The packaging information obtaining connectivity fault management CFM message corresponding to OAM message specifically comprises:
1, according to the type of message of the label determination OAM message of OAM message;
2, the MEG index of the MEG that OAM message detects is obtained according to the label of OAM message and the type of message of OAM message;
3, table look-up according to MEG index, obtain the packaging information of corresponding CFM message.
Step 302, recombinates to OAM message according to packaging information, OAM message is reassembled as CFM message.
In step 302, concrete needs is handled as follows:
1, to peel off in OAM message all the elements before protocol Data Unit PDU, and add upper two layers of new head;
2, the object MAC of CFM message is determined according to the MEG rank in packaging information, the VLAN of CFM message is determined according to the VLAN mark in packaging information, and the protocol number corresponding according to CFM message determines the Ethernet protocol number of CFM message, form the CFM message after restructuring.
Preferably, after step 302, can also be handled as follows: carry out reception process to CFM message, if do not received in the given time in Maintenance Entity MEG, certain safeguards the CFM message corresponding to associating end points MEP, then produce corresponding warning information.Wherein, when producing corresponding warning information, needing, according to the MEP mark and the MEG index that produce alarm, to table look-up and obtain the keyword in tunnel number or pseudo-line PW, producing warning information according to tunnel number or keyword.
Below in conjunction with accompanying drawing, the technical scheme of the embodiment of the present invention is described in detail.Fig. 4 is the detailed process figure of the OAM message processing method of the embodiment of the present invention, as shown in Figure 4, comprises following process:
Step 401, packet parsing module receives sends from device port the message come to.
Step 402, packet parsing module is resolved message, according to being whether control word after MPLS message and 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, enter step 404.
Step 403, other Message processing.
Step 404, packet parsing module judges it is the MPLS-TP OAM message of which kind of type further, if skin is tunnel label, the second layer is 13 labels, then think the MPLS-TP OAM message detecting tunnel, enter step 406; If skin is tunnel label or LDP label, the second layer is PW label, then think the MPLS-TP OAM message detecting PW, enter step 405.
Step 405, packet parsing module 101 PW label is tabled look-up, obtain MPLS-TP OAM message detect the MEG INDEX of MEG.Enter step 407.
Step 406, packet parsing module tunnel label is tabled look-up, obtain MPLS-TP OAM message detect the MEG INDEX of MEG.Enter step 407.
Step 407, the MEG INDEX that packet parsing module previous step obtains tables look-up, and obtains CFM message packaging information, specifically comprises MEL corresponding to MEG and " inner VLAN ".
Step 408, Packet reassembling module is recombinated to MPLS-TP OAM message, and concrete behavior comprises: first peel off all the elements before OAM PDU; Then add two layers of new head, object MAC fills out multicast MAC 0x01-80-C2-00-00-3X, and wherein, " X " fills out the MEL (scope 0-7) obtained in step 407, and VLAN fills out " the inner VLAN " that obtain in step 407; Ether protocoll number 0x8902; Retain original PDU, the CFM message that final formation one is complete.Enter step 409.
Step 409, the CFM message formed after restructuring is sent to CFM message processing module (MPM) by Packet reassembling module.Enter step 410.
Step 410, CFM message processing module (MPM) carries out reception process to CFM message.If do not receive the CFM message of certain Remote MEP in some cycles, then produce alarm and notice the generation of upper layer software (applications) fault.And can be tabled look-up by the Remote MEP information producing alarm and obtain the keyword in tunnel, namely the keyword (PW ID) of tunnel number or PW takes upper-layer software module to from warning information, wherein, RemoteMEP information comprises: Remote MEP ID+MEG INDEX.
In sum, the embodiment of the present invention is by being reassembled as CFM message to the MPLS-TP OAM message received, original CFM message is utilized to receive flow process to receive OAM message, the message solving CFM and MPLS-TP OAM two kinds of forms in prior art has different reception handling processes, thus consume a large amount of system resource, increase the problem of the complexity of system process simultaneously, existing CFM message can be made full use of and receive flow process, achieve the reception about the OAM message of tunnel and PW in MPLS-TP, decrease the consumption of system resource, simplify the complexity of system process, and utilize the original alarm processing of CFM to realize the fault warning of tunnel or PW.In addition, the present invention is utilized can to carry out Function Extension, because the present invention does not make any amendment to CFM mechanism, so very conveniently function upgrading can be completed fast in the system originally realizing ether OAM or CFM detection; And for the network processor chip of forwarding plane function limitation, such as, only support the processor chips of CFM, according to technical scheme expensive chip function of the present invention, R&D costs can be reduced.
Although be example object, disclose the preferred embodiments of the present invention, it is also possible for those skilled in the art will recognize various improvement, increase and replacement, and therefore, scope of the present invention should be not limited to above-described embodiment.
Claims (9)
1. an operation management maintain OAM message processing method, is characterized in that, comprising:
The message received is resolved, determines that described message is OAM message;
The type of message of described OAM message is determined according to the label of described OAM message;
The MEG index of the Maintenance Entity MEG that described OAM message detects is obtained according to the label of described OAM message and the type of message of described OAM message;
Table look-up according to described MEG index, obtain the packaging information of corresponding connectivity fault management CFM message;
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, resolves the message received, and determines that described message is that OAM message specifically comprises:
The described message received is resolved, determines whether described message carries control word;
If described message carries described control word, then determine whether described message is described OAM message according to the concrete numerical value of described control word.
3. the method for claim 1, is characterized in that, described packaging information comprises: the MEG rank that described MEG is corresponding and virtual LAN VLAN mark;
According to described packaging information, described OAM message is recombinated, described OAM message is reassembled as described CFM message and specifically comprises:
To peel off in described OAM message all the elements before protocol Data Unit PDU, and add upper two layers of new head;
The object MAC of described CFM message is determined according to the described MEG rank in described packaging information, the VLAN of described CFM message is determined according to the described VLAN mark in described packaging information, and the protocol number corresponding according to described CFM message determines the Ethernet protocol number of described CFM message, form the described CFM message after restructuring.
4. the method for claim 1, is characterized in that, described method also comprises:
Carry out reception process to described CFM message, if do not received in the given time in MEG, certain safeguards the CFM message corresponding to associating end points MEP, then produce corresponding warning information.
5. method as claimed in claim 4, it is characterized in that, the corresponding warning information of described generation specifically comprises:
According to the MEP mark and the MEG index that produce alarm, table look-up and obtain the keyword in tunnel number or pseudo-line PW, produce described warning information according to described tunnel number or described PW keyword.
6. an Operation Administration and Maintenance OAM message processing unit, is characterized in that, comprising:
Packet parsing module, for resolving the message received, determine that described message is OAM message, and the type of message of described OAM message is determined according to the label of described OAM message, the MEG index of the MEG that described OAM message detects is obtained according to the label of described OAM message and the described type of message of described OAM message, table look-up according to described MEG index, obtain the packaging information of corresponding connectivity fault management CFM message;
Packet reassembling module, for recombinating to described OAM message according to described packaging information, is reassembled as described CFM message by described OAM message.
7. device as claimed in claim 6, it is characterized in that, described device also comprises:
CFM message processing module (MPM), for carrying out reception process to described CFM message, if do not received in the given time in Maintenance Entity MEG, certain safeguards the CFM message corresponding to associating end points MEP, then produce corresponding warning information.
8. device as claimed in claim 7, is characterized in that:
Described packet parsing module specifically for:
The described message received is resolved, determines whether described message carries control word;
If described message carries described control word, then determine whether described message is described OAM message according to the concrete numerical value of described control word;
The type of message of described OAM message is determined according to the label of described OAM message;
The MEG index of the MEG that described OAM message detects is obtained according to the label of described OAM message and the described type of message of 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 for:
According to the MEP mark and the MEG index that produce alarm, table look-up and obtain the keyword in tunnel number or pseudo-line PW, produce described warning information according to described tunnel number or described PW keyword.
9. device as claimed in claim 8, it is characterized in that, described packaging information comprises: the MEG rank that described MEG is corresponding and virtual LAN VLAN mark;
Described Packet reassembling module specifically for:
To peel off in described OAM message all the elements before protocol Data Unit PDU, and add upper two layers of new head;
The object MAC of described CFM message is determined according to the described MEG rank in described packaging information, the VLAN of described CFM message is determined according to the described VLAN mark in described packaging information, and the protocol number corresponding according to described CFM message determines the Ethernet protocol number of described CFM message, form the described CFM message after restructuring.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102404180A (en) * | 2011-11-10 | 2012-04-04 | 神州数码网络(北京)有限公司 | Method and system for realizing Operation and Maintenance (OAM) based on Packet Based Networks (PBN) network |
| CN102904775B (en) * | 2012-09-29 | 2015-04-29 | 华为技术有限公司 | Method, apparatus and system for measuring network packet loss |
| CN103595507A (en) * | 2013-11-15 | 2014-02-19 | 烽火通信科技股份有限公司 | Internal information transmission device and internal information transmission method in packet network system |
| CN105024985B (en) * | 2014-04-30 | 2019-04-02 | 深圳市中兴微电子技术有限公司 | A kind of message processing method and device |
| CN105515807B (en) * | 2014-09-25 | 2020-09-08 | 中兴通讯股份有限公司 | Up cfm message processing method and system and network data exchange equipment |
| CN105577413B (en) * | 2014-10-17 | 2019-09-10 | 中兴通讯股份有限公司 | Operations, Administration and Maintenance OAM message processing method and processing device |
| CN105187278B (en) * | 2015-09-21 | 2018-09-04 | 盛科网络（苏州）有限公司 | The chip implementing method of the detection OAM mistakes of no loss |
| CN106789390A (en) * | 2016-04-28 | 2017-05-31 | 新华三技术有限公司 | A kind of pseudo-wire condition detection method and device |
| CN107920000A (en) * | 2017-12-05 | 2018-04-17 | 安徽皖通邮电股份有限公司 | A kind of detection protocol extended method based on MPLSL2VPN business |
| 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 |
| CN115086231A (en) * | 2022-06-22 | 2022-09-20 | 杭州云合智网技术有限公司 | Analysis method of PW layer OAM |
| CN115242736B (en) * | 2022-07-15 | 2024-04-12 | 云合智网(上海)技术有限公司 | Light load message transmission method |
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| CN101420385A (en) * | 2008-12-12 | 2009-04-29 | 北京邮电大学 | Mechanism for implementing OAM functional interconnection between T-MPLS and matchable MPLS network |
| CN101741592A (en) * | 2008-11-13 | 2010-06-16 | 华为技术有限公司 | Method, device and system for managing GPON branch in multi-service transmitting network |
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| US8125914B2 (en) * | 2009-01-29 | 2012-02-28 | Alcatel Lucent | Scaled Ethernet OAM for mesh and hub-and-spoke networks |
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| CN101741592A (en) * | 2008-11-13 | 2010-06-16 | 华为技术有限公司 | Method, device and system for managing GPON branch in multi-service transmitting network |
| CN101420385A (en) * | 2008-12-12 | 2009-04-29 | 北京邮电大学 | Mechanism for implementing OAM functional interconnection between T-MPLS and matchable MPLS network |
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