CN101420385A - Mechanism for implementing OAM functional interconnection between T-MPLS and matchable MPLS network - Google Patents
Mechanism for implementing OAM functional interconnection between T-MPLS and matchable MPLS network Download PDFInfo
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- CN101420385A CN101420385A CNA2008102399059A CN200810239905A CN101420385A CN 101420385 A CN101420385 A CN 101420385A CN A2008102399059 A CNA2008102399059 A CN A2008102399059A CN 200810239905 A CN200810239905 A CN 200810239905A CN 101420385 A CN101420385 A CN 101420385A
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Abstract
The present invention provides a method for OAM function intercommunication in network interconnection. The method is used for realizing uniform OAM function when a MPLS network and a T-MPLS network form peer-to-peer interconnection. The method of the invention expands the processing to the OAM frame for completing the processing of OAM frames between different networks. At the same time the mapping of different network OAM frame format is completed between the network boundary nodes for realizing the same OAM function of different networks. The method according to the invention effectively uses the extensibility of OAM frame and the extensibility of node to the OAM frame processing. The intercommunication of OAM function is realized when the MPLS and T-MPLS network are interconnected. The realizing of OAM function of two networks is guaranteed. The operation managing capacity when the networks are interconnected is increased.
Description
Affiliated field
Present invention relates in general to the realization mechanism of network interworking, more specifically, relate to the treatment mechanism when T-MPLS Packet Transport Network and MPLS network carry out the OAM intercommunication.
Background technology
T-MPLS is the tranmission techniques of MPLS being simplified for the needs that adapt to the transmission net, and its core is to set up label switched path (LSP) end to end by network management system or control plane, and Packet Service is transmitted according to label on this LSP.T-MPLS supports the bandwidth statistic multiplexing of Packet Service and the certainty of TDM business to transmit simultaneously.The TMPLS technology is simplified and is developed MPLS, according to the requirement that transmits net the MPLS technology essential factor is reduced.Such as the option of not supporting among the MPLS such as PHP, polymerization, ECMP; but OAM, protection and Based Intelligent Control surface function to MPLS are expanded; can provide continuity detection, mistake forward direction and back to OAM(Operation Administration Maintenance)s such as indication, loopback and Performance Detection, also support multicast, or the like.
According to ITU-T regulation G.8110.1, adopt the Client/server model to carry out T-MPLS and IP/MPLS networking end to end, comprise that T-MPLS is as the client signal of MPLS or the MPLS client signal dual mode as T-MPLS.
In T-MPLS over MPLS mode, T-MPLS is applied in MAN, and T-MPLS provides the multi-service telecom-level carrier, and core net is used the MPLS technology, and T-MPLS is by the MPLS tunneling technique, by the MPLS core net.At fringe node, provide the intercommunication of GMPLS agreement and mpls protocol.
In MPLS over T-MPLS mode, MPLS provides the IP signal to insert, and IP/MPLS transmits in the T-MPLS network as the client signal of T-MPLS.At fringe node, provide the intercommunication of mpls protocol and GMPLS agreement.T-MPLS is as bearer network, the carrying MPLS layer, and MPLS can carry the IP signal, also can be by pseudo-line technology carrying multiple business.
And at present do not provide a kind of total solution at the intercommunication of OAM between T-MPLS and two peer-to-peer networks of MPLS.Therefore, the intercommunication mechanism that how to solve OAM between T-MPLS and the MPLS equity is the current problem that must solve.
Summary of the invention
Therefore, the realization mechanism and the method that the purpose of this invention is to provide the OAM(Operation Administration Maintenance) intercommunication of two peer-to-peer networks of a kind of T-MPLS and MPLS when interconnected, the treatment mechanism and the functional mode of each node when having proposed the OAM intercommunication, realized the intercommunication of OAM(Operation Administration Maintenance) in T-MPLS and the MPLS business intercommunication model, guaranteed the OAM IWF, improve the operation maintenance level of intercommunication network, effectively utilized resource, reduced the cost of the network operation.
In order to realize this purpose, according to the solution of the present invention, the OAM intercommunication mechanism of these two peer-to-peer networks of T-MPLS network and MPLS network when interconnected has been proposed, mainly realize extension process and OAM frame the mapping between two heterogeneous networks of network node to the OAM frame.
We utilize in the MPLS network Exp field in the OAM frame head to represent whether this OAM frame is the OAM frame that is sent to intercommunication network.OAM in the net is provided with Exp=0; When other networks send the OAM frame, Exp=1 is set; Promptly in the time need carrying out the OAM detection to the path of inter-network, the frame head Exp that sends the node OAM frame of OAM frame is set to 1.
In addition, the path in the present invention MPLS network is set to the management entity in the T-MPLS Network Management territory, and therefore this intercommunication path correspondence corresponding M EG ID and corresponding target MEP sign in the T-MPLS network.
Therefore, the present invention is in the information such as route of mutual mutual two networks of boundary node of MPLS network and T-MPLS network, and safeguard two information tables separately, a table is the path management territory table of comparisons, and LSP node identification and ID of trace route path and MEG, MEP sign in the mpls domain are contrasted.Another table is used for safeguarding forwarding information, transmits the OAM bag according to LSR ID and LSP ID decision to that port Port, can determine according to this table the OAM frame by which interconnect port is transmitted.
Judge that according to the Exp field of OAM bag this OAM sends to peer-to-peer network at boundary node (gateway), according to two information tables safeguarding on the node OAM is mapped as this peer-to-peer network OAM frame format then, and this OAM frame is forwarded in another network to transmit in this network then realizes OAM(Operation Administration Maintenance).
The present invention is in existing T-MPLS network and MPLS network on separately the OAM manufacturing basis, OAM intercommunication mechanism under the situation of two network interconnections has been proposed, realize the OAM(Operation Administration Maintenance) of internet, network and internetwork management maintenance have been guaranteed, effectively raise the O﹠M ability between net in the network, ensured the intercommunication between net.
Description of drawings
By the following detailed description that reference is considered in conjunction with the accompanying drawings, more complete purpose of the present invention and many advantages will become obviously, and it can be understood better, and in the accompanying drawings, identical reference symbol is represented same or analogous assembly, wherein:
Fig. 1 shows T-MPLS and MPLS interconnect model.
OAM intercommunication scene when Fig. 2 shows the MPLS and the T-MPLS network interconnection.
Fig. 3 shows the boundary node path management territory table of comparisons.
Fig. 4 shows transmitting of boundary node maintenance.Wherein (a) goes out transmitting of network for OAM; (b) go into transmitting of network for OAM.
Fig. 5 shows MPLS network OA M frame message format.
Fig. 6 shows T-MPLS network OA M frame message format.
Fig. 7 shows the handling process of MPLS network boundary node to T-MPLS forwarded OAM frame.
Fig. 8 shows the handling process that T-MPLS network boundary node receives the OAM frame of MPLS forwarding.
Specific embodiments
Describe exemplary embodiments of the present invention below with reference to the accompanying drawings in detail, for avoiding unnecessarily to make theme of the present invention become unclear, omit the known function shown in the included or accompanying drawing or the detailed description of configuration here.
In view of OAM(Operation Administration Maintenance) in the network is numerous, but node is similar substantially to the operation of OAM, and we are that present invention is described for example with the CV bag.
A kind of scene that Fig. 1 uses for the present invention.MPLS and T-MPLS network are peer-to-peer network, and two networks fringe node by separately carries out interconnected, and these two fringe nodes can be regarded gateway node as, and OAM is handled accordingly.
Principle according to network interconnection intercommunication, based on control plane and management plane and basic Border Gateway Protocol, MPLS and T-MPLS network are set up the LSP path separately and are passed through the boundary node interconnection of network, as shown in Figure 2, the intercommunication path of the T-R4 of R1 node in the T-MPLS network is set up from the MPLS network.In the MPLS network, R1-〉R2-〉R3-〉A sets up a LSP path; In the T-MPLS network, because the execution of OAM is based on the pattern of management domain and management entity, the path of this intercommunication of the present invention is set to the management entity in certain management domain of T-MPLS network, and therefore this intercommunication path correspondence corresponding M EG ID and corresponding target MEP sign (T-R4) in the T-MPLS network.
Like this, the present invention is in the information such as route of mutually mutual MPLS network of boundary node A, the B of two networks and T-MPLS network, and safeguards two information tables, and wherein one is the path management territory table of comparisons, as shown in Figure 3, node carries out the conversion of LSP sign and MEG, MEP sign according to this table.Wherein, LSR ID is LSP source node sign, also is the promoter of OAM bag; LSP ID is an ID of trace route path in the MPLS network; MEG ID is the MEG sign of this intercommunication path in the T-MPLS network; MEP is this intercommunication path target MEP sign in the T-MPLS network.Another table is safeguarded forwarding information, transmit the OAM bag according to LSR ID and LSP ID decision to that port, as shown in Figure 4, (a) represent that OAM exports the forwarding information table of the boundary node maintenance of network, (b) the forwarding information table of the boundary node maintenance of expression OAM inlet network.Boundary node can determine according to this table the OAM frame is forwarded to peer-to-peer network by which port.
Therefore, network node R1 transmission CV frame carries out detection of connectivity to intercommunication path LSP.Because the CV frame need arrive peer-to-peer network T-MPLS, the Exp field that therefore is provided with in the frame head of CV frame is 1, represents that this CV frame is the OAM frame that is sent to intercommunication network.This CV frame is forwarded to boundary node A along the LSP in the MPLS network.When node A receives the OAM bag, judge according to the Exp field in the OAM frame head whether this OAM frame is the OAM frame of this node, works as Exp=0,, otherwise carry out the mapping and the corresponding processing of frame format, send to the T-MPLS network then as the OAM in the present networks.Here Exp=1 then carries out the mapping of CV frame format, and concrete steps are as follows:
1, carries out the mapping conversion of corresponding frame format.Enter bottom OAM label, be judged as the OAM frame, then at first the value of Exp is set to 0, and is corresponding with the MEL of OAM frame stem in the T-MPLS network.The value of Label, S, three fields of TTL is duplicated and is remained unchanged.
2, according to the type of OAM frame the OAM frame being carried out certain mapping then handles.The information field structure of OAM frame as shown in Figure 5 in the CV:MPLS network.Boundary node A is judged as the CV frame according to function type, and the Period field is set to 100, is every 1s one-period according to CV frame in the MPLS network just, is set to 100, expression 1s.
3, node A transmits according to transmitting to the forwarding port of correspondence in the boundary node again.
4, when the CV frame is handled the boundary node B of back arrival T-MPLS network through node A, the B node judges that according to the OAM label this CV frame is the OAM frame, then read the OAM frame, according to field LSP ID in the frame and LSR ID, the described path management territory table of comparisons obtains MEG ID and MEP ID in the T-MPLS network above the inquiry.Revise the frame format of OAM again, MEP ID and MEG ID are defined according to OAM frame format in the T-MPLS network respectively, and finally produce OAM frame in the T-MPLS network, as shown in Figure 6.
5, according to the Label Forwarding Information Base at top Node B place, the OAM frame is forwarded to target MEP, finishes the CV function.
When OAM from the T-MPLS network when the MPLS network sends, also change according to above-mentioned steps, the Exp=1 of OAM frame is set in source node T-R4 (Fig. 2), show that this OAM frame is for outwards sending the OAM frame, boundary node B to T-MPLS, this Node B is according to the path management territory table of comparisons, MEG ID and MEP ID are converted to LSR ID and LSP ID in the corresponding mpls domain, revise the OAM frame format then, be converted to OAM frame format in the MPLS network, as shown in Figure 5, like this when this OAM frame arrives the boundary node A of MPLS network, Label Forwarding Information Base according to Node B is forwarded to purpose LSR with the OAM frame, finishes OAM(Operation Administration Maintenance).
Above the described intercommunication mechanism that is MPLS when the T-MPLS network sends the OAM frame and the processing mode of node, shown in Figure 8 as Fig. 7, based on above-mentioned steps, the OAM intercommunication when the present invention can be good at realizing the MPLS and the T-MPLS network interconnection.
Above-described, only be a scene possible embodiments of the present invention, be not so limit to claim of the present invention, so the equivalence that all application specification of the present invention or accompanying drawing content are done changes, all in like manner all be contained in the scope of the present invention, to ensure inventor's rights and interests, in this statement.
Claims (7)
1, OAM(Operation Administration Maintenance) intercommunication mechanism during the T-MPLS network interconnection of a kind of MPLS network and equity comprises that mainly node in the network is to extension process and the conversion of OAM frame between heterogeneous networks of OAM.
2, OAM(Operation Administration Maintenance) intercommunication according to claim 1, two networks can be realized consistent OAM(Operation Administration Maintenance) when it is characterized in that two network interconnections.
3, the node in the network according to claim 1 is to the extension process of OAM, and the source node that it is characterized in that sending the OAM frame is to the expansion to OAM(Operation Administration Maintenance) of the expansion of OAM and network boundary node.
4, source node according to claim 3 is characterized in that representing with the Exp field of OAM frame head in the MPLS network whether this OAM frame is the OAM frame that is sent to intercommunication network to the expansion of OAM.OAM in the net is provided with Exp=0; When other networks send the OAM frame, Exp=1 is set; Promptly in the time need carrying out the OAM detection to the path of inter-network, the Exp that sends the source node OAM frame head of OAM frame is set to 1.
5, network boundary node according to claim 3 is to the expansion of OAM(Operation Administration Maintenance), it is characterized in that boundary node (gateway) judges that according to the Exp field of OAM bag this OAM is for sending to peer-to-peer network, according to the information table of safeguarding on the boundary node OAM is mapped as this peer-to-peer network OAM frame format again, and in two networks, transmits this OAM frame.
6, the information table of safeguarding on the boundary node according to claim 5 is characterized in that existing two information tables.A table is the path management territory table of comparisons, and LSP node identification and ID of trace route path and MEG, MEP sign in the mpls domain are contrasted; Another table is used for safeguarding forwarding information, transmits the OAM bag according to LSR ID and LSP ID decision to that port Port, can determine according to this table the OAM frame by which interconnect port is transmitted.
7, the conversion of OAM frame according to claim 1 between heterogeneous networks is characterized in that node is supplemented to information such as LSP ID, LSR ID, MEG ID, MEP ID in the OAM frame format of corresponding network according to the information table of wherein safeguarding.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185780A (en) * | 2011-05-12 | 2011-09-14 | 中兴通讯股份有限公司 | Operation, administration and maintenance (OAM) message processing method and device |
| WO2013174101A1 (en) * | 2012-05-25 | 2013-11-28 | 华为技术有限公司 | Connectivity detection method, device and system |
| CN103780420A (en) * | 2012-10-25 | 2014-05-07 | 中国电信股份有限公司 | Automatic configuration method and system of Ethernet connectivity detection in VPLS environment |
| CN105530115A (en) * | 2014-10-23 | 2016-04-27 | 华为技术有限公司 | Method and device for realizing operation management and maintenance function |
| WO2018188464A1 (en) * | 2017-04-13 | 2018-10-18 | 中兴通讯股份有限公司 | Methods and devices for realizing ioam, and storage medium |
-
2008
- 2008-12-12 CN CNA2008102399059A patent/CN101420385A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185780A (en) * | 2011-05-12 | 2011-09-14 | 中兴通讯股份有限公司 | Operation, administration and maintenance (OAM) message processing method and device |
| CN102185780B (en) * | 2011-05-12 | 2015-09-16 | 中兴通讯股份有限公司 | OAM message processing method and device |
| WO2013174101A1 (en) * | 2012-05-25 | 2013-11-28 | 华为技术有限公司 | Connectivity detection method, device and system |
| US9491074B2 (en) | 2012-05-25 | 2016-11-08 | Huawei Technologies Co., Ltd. | Method, apparatus, and system for detecting connectivity |
| CN103780420A (en) * | 2012-10-25 | 2014-05-07 | 中国电信股份有限公司 | Automatic configuration method and system of Ethernet connectivity detection in VPLS environment |
| CN103780420B (en) * | 2012-10-25 | 2017-07-28 | 中国电信股份有限公司 | The method of automatic configuration and system of Ethernet detection of connectivity under VPLS environment |
| CN105530115A (en) * | 2014-10-23 | 2016-04-27 | 华为技术有限公司 | Method and device for realizing operation management and maintenance function |
| WO2016062165A1 (en) * | 2014-10-23 | 2016-04-28 | 华为技术有限公司 | Method and apparatus for implementing operations, administration and maintenance function |
| CN105530115B (en) * | 2014-10-23 | 2019-10-22 | 华为技术有限公司 | A kind of method and device for realizing operation management maintainance function |
| US10862735B2 (en) | 2014-10-23 | 2020-12-08 | Huawei Technologies Co., Ltd. | Method and apparatus for implementing operation, administration, and maintenance function |
| WO2018188464A1 (en) * | 2017-04-13 | 2018-10-18 | 中兴通讯股份有限公司 | Methods and devices for realizing ioam, and storage medium |
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Open date: 20090429 |