CN102098219A - Method and device for bearing point to multipoint pseudowire service - Google Patents
Method and device for bearing point to multipoint pseudowire service Download PDFInfo
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- CN102098219A CN102098219A CN201110025897XA CN201110025897A CN102098219A CN 102098219 A CN102098219 A CN 102098219A CN 201110025897X A CN201110025897X A CN 201110025897XA CN 201110025897 A CN201110025897 A CN 201110025897A CN 102098219 A CN102098219 A CN 102098219A
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Abstract
The invention provides a method and a device for bearing point to multipoint pseudowire service. The method comprises the following steps that: point to multipoint pseudowire (P2MP PW) service is allocated on a point to multipoint label switched path (P2MP LSP), wherein the P2MP PW service is allocated on the P2MP LSP with the same leaf nodes as the P2MP LSP, and the other leaf nodes except the same leaf nodes in the P2MP PW service are allocated on the other or multiple P2MP LSP or point to point label switched path (P2P LSP); and the data of the P2MP PW service are transmitted according to the above allocation. By adopting the method and the device, the flexibility of the resource allocation of the network is improved, and the resource utilization rate is increased.
Description
Technical field
The present invention relates to the communications field, method and apparatus in particular to bearing point to the multiple spot pseudo-line service.
Background technology
Multiprotocol label switching (Multi-Protocol Label Switching, abbreviating MPLS as) grouped data that a class is had a same characteristic features is classified as a forwarding equivalence class (Forwarding Equivalence Class, abbreviate FEC as), and the label value information of distributing the used 20bits of corresponding forward-path and forwarding for each FEC, and these configurations are one step completed.In ensuing repeating process, directly packet data package is transmitted operation according to a label value of distributing, and do not need to inquire about header information with the analyzing packet data bag, and therefore accelerated data forwarding speed, reduced performance requirement simultaneously to equipment.
According to the MPLS point to multiple spot (Point to Multipoint, abbreviate P2MP as) operation management maintain (Operations, Administration and Maintenance, abbreviation OAM) description of [RFC4687] and MPLS multicast encapsulation [RFC5332], in the MPLS network configuration, putting multiple spot MPLS is an application facet.In the MPLS network, pseudo-line (PseudoWire, abbreviate PW as) be mainly used in simulation and carry miscellaneous service, for example, Ethernet, asynchronous transfer mode (AsynchronousTransfer Mode, abbreviation ATM), frame relay (Frame Relay, be called for short FR), time division multiplexing (Time DivisionMultiplexing, abbreviation TDM), synchronous optical network (Synchronous Optical Network, be called for short SONET)/SDH (Synchronous Digital Hierarchy) (Synchronous Digital Hierarchy is called for short SDH) etc.
The configuration mode to putting multiple spot PW in correlation technique is: use and point-to-multipoint label switch paths (Label Switched Path abbreviates LSP as) the carrying PW business of putting the corresponding same leaf node of multiple spot PW.Article one, to multiple spot PW business, the leaf node of PW and the leaf node of LSP are identical to the only corresponding such point of multiple spot LSP for point; When they have some leaf nodes inequality the time, then can't make up many points to the LSP of multiple spot to multiple spot PW business at this point.
Such configuration mode when practical application, can cause Resource Allocation in Networks dumb, and resource is used inadequate problem.
Summary of the invention
Main purpose of the present invention is to provide method and the device of bearing point to the multiple spot pseudo-line service, to address the above problem at least.
According to an aspect of the present invention, the method of a kind of bearing point to the multiple spot pseudo-line service is provided, comprise: on point-to-multipoint label switch paths P2MP LSP, carry out the configuration of point to multi-point pseudowire P2MP PW business, wherein, described P2MPPW business configuration is had on the P2MP LSP of identical leaf node with it, other leaf nodes except that described identical leaf node in the described P2MP PW business are being configured in addition on one or more P2MP LSP or the P2P LSP; Transmit the data of described P2MP PW business according to described configuration.
Preferably, common leaf node in a plurality of P2MP PW business is configured on same the P2MP LSP, other leaf nodes except that described common leaf node in described a plurality of P2MP PW business are configured in addition on one or more P2MP LSP or the P2P LSP.
Preferably, the configuration of carrying out described P2MP PW business on described P2MP LSP comprises: by label binding, different P2MP PW business configuration that will be on described P2MP LSP is in different forwarding equivalence class FEC, wherein, the described different corresponding different label distribution and different forward-paths of FEC.
Preferably, realize described label binding by tag distribution protocol.
Preferably, realize described label binding by the tag distribution protocol of band resource constraint.
Preferably, comprise in the configuration of carrying out P2MP PW business on the P2MP LSP: by management plane manual configuration P2MP PW business on P2MP LSP.
According to another aspect of the present invention, a kind of device of the P2MP of carrying PW business also is provided, comprise: configuration module, be used on P2MP LSP, carrying out the configuration of P2MP PW business, wherein, described P2MP PW business configuration is had on the P2MP LSP of identical leaf node with it, other leaf nodes except that described identical leaf node in the described P2MP PW business are being configured in addition on one or more P2MP LSP or the P2P LSP; Transport module is used for transmitting according to described configuration the data of described P2MP PW business.
Preferably, described configuration module is used for the common leaf node of a plurality of P2MP PW business is configured in same P2MPLSP, and other leaf nodes except that described common leaf node in described a plurality of P2MP PW business are configured in addition on one or more P2MP LSP or the P2P LSP.
Preferably, described configuration module is used for by label binding, different P2MP PW business configuration that will be on P2MP LSP in different forwarding equivalence class FEC, wherein, the described different corresponding different label distribution and different forward-paths of FEC.
Preferably, described configuration module is used for by the management plane described P2MP PW of manual configuration business on P2MP LSP.
By the present invention, solved and caused that Resource Allocation in Networks is dumb, resource is used inadequate problem, and then improved the flexibility of Resource Allocation in Networks, improved resource utilization.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the carrying P2MP PW operational approach of the embodiment of the invention;
Fig. 2 is the structured flowchart according to the carrying P2MP PW service apparatus of the embodiment of the invention;
Fig. 3 is that the P2MP LSP according to the embodiment of the invention carries the schematic diagram of a plurality of P2MP PW when professional;
Fig. 4 is the Business Stream schematic diagram according to the P2MP PW1 of the embodiment of the invention;
Fig. 5 is the Business Stream schematic diagram according to the P2MP PW2 of the embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
In the present embodiment, provide the method for a kind of P2MP of carrying PW, Fig. 1 is the flow chart of point to multiple spot LSP bearing point to multiple spot PW method according to the embodiment of the invention, and as shown in Figure 1, this flow process may further comprise the steps:
Step S102, configuration P2MP PW business on P2MP LSP, wherein, the P2MPPW business configuration is had on the P2MP LSP of identical leaf node with it, other leaf nodes except that identical leaf node in this P2MP PW business are configured in addition on one or more P2MP LSP or point-to-point (Point to Point the abbreviates P2P as) LSP;
Step S104 is according to the data of the configuration of above-mentioned steps transmission P2MP PW business.
By above-mentioned steps, adopted a P2MP PW and a P2MP LSP that being configured on the bar P2MP LSP of common leaf node arranged, the leaf node that has more can use point-tor point P 2 P LSP, can certainly use P2MP LSP to come transmit traffic data.Thereby changed in the correlation technique owing to the leaf node among the P2MP LSP and P2MP PW node are must the identical Resource Allocation in Networks that causes dumb, resource is used inadequate problem, thereby has improved the flexibility and the resource utilization of resource allocation.
Preferably, when implementing, in order further to economize on resources, common leaf node in a plurality of P2MP PW business can be configured on same the P2MP LSP, other leaf nodes except that described common leaf node in these a plurality of P2MP PW business are configured in addition on one or more P2MP LSP or the P2P LSP.For example, the common leaf node of a plurality of P2MP PW uses same P2MP LSP to transmit its business datum, and the different leaf node of these P2MP PW uses a point-tor point P 2 P LSP to transmit its business datum separately.Below this is illustrated.
If one the leaf node of P2MP PW1 has (A, B, C, D, E), the leaf node of another P2MP PW2 has (B, C, D, E), these two P2MP PW use a P2MP LSP transmit traffic data with following leaf node (B, C, D, E) (for example, the leaf node of P2MP PW business can be the same or more with its leaf node of P2MP LSP of carrying so.If the set of using the viewpoint of set then being expressed as the leaf node of P2MP LSP can be the subclass of set of the leaf node of P2MP PW); Simultaneously, PW1 passes the business datum that sends them to leaf node A by a P2P LSP in addition.
When implementing, mode in P2MP LSP configuration P2MP PW business can have a variety of, no matter adopt which kind of configuration mode, all can solve problem in the correlation technique, reach the purpose that improves the Resource Allocation in Networks flexibility, improves resource utilization as long as be configured to configuration in the foregoing description.Describe by way of example below.
For example, can by label binding will be on P2MP LSP different P2MP PW business configuration in different forwarding equivalence class FEC, wherein, label distribution and different forward-paths that different FEC is corresponding different.Preferably, the label binding method can be passed through tag distribution protocol (Label Distribution Protocol abbreviates LDP as), or other tag distribution protocols that have resource constraint are realized.Implementation in this example can realize dynamic configuration.
Again for example, can on P2MP LSP, carry out manual configuration by management plane to P2MP PW business.This configuration mode is realized fairly simple.
In the present embodiment, also provide a kind of device of the P2MP of carrying PW business, this device comprises: configuration module 22, transport module 24.Below this structure is described.
Configuration module 22 is used for carrying out the configuration of P2MP PW business on P2MP LSP, wherein, the P2MPPW business configuration is had on the P2MP LSP of identical leaf node with it, other leaf nodes except that identical leaf node in the P2MP PW business are being configured in addition on one or more P2MP LSP or the P2P LSP; Transport module 24 is connected to configuration module 22, and this module is used for the data according to the configuration transmission P2MP PW business of configuration module 22.
Preferably, configuration module 22 can also be used for the common leaf node of a plurality of P2MP PW business is configured in same P2MP LSP, and other leaf nodes except that common leaf node in a plurality of P2MP PW business are configured in addition on one or more P2MPLSP or the P2PLSP.
Preferably, configuration module 22 be used for will be on P2MP LSP by label binding different P2MP PW business configuration to different forwarding equivalence class FEC, wherein, label distribution and different forward-paths that different FEC is corresponding different.
Preferably, configuration module 22 also is used for by management plane manual configuration P2MP PW business on P2MP LSP.
Many professional P2MP LSP of sharing of different P2MP PW have been realized by the foregoing description, improved network resource utilization on the one hand, and walk same P2MP LSP by disposing many P2MP PW business, can utilize limited bandwidth resources as far as possible fully.On the other hand, by dispose many PW business at same point to the LSP of multiple spot, can reduce the quantity of setting up LSP significantly, saved required distribution number of tags simultaneously.These changes can be clearly reduction to the requirement of equipment performance, so that the equipment of same performance can carry more business.Meanwhile,, also be convenient to network management, maintenance and operation, under the condition that satisfies SLA and QoS, can provide more flexibility and bigger reliability by to multiple spot LSP, carrying a plurality of PW business at a point.
Describe below in conjunction with a preferred embodiment, need to prove, the preferred embodiment combines the foregoing description and preferred implementation thereof.
In this preferred embodiment, to multiple spot LSP, dispose many points at a point to multiple spot PW business by control plane dynamic-configuration or management plane manual configuration.
According to LSP and PW information, to the LSP of multiple spot, dispose many points to multiple spot PW business at a point; This PW is professional to be transmitted by a P2MP LSP with the professional common leaf node of other PW, and remaining is not that the LSP of leaf node by P2P of common leaf node transmits.For other PW business, adopt to be configured simultaneously with quadrat method; Above function transmits tag configurations by signaling and realizes.Can make different P2MP PW business shared its Internet resources on P2MP LSP transmit the data of corresponding P2MP PW business by such processing.
Fig. 3 is that the P2MP LSP according to the embodiment of the invention carries the schematic diagram of a plurality of P2MP PW when professional, as shown in Figure 3, and R-L1: a P2P LSP, R-(L2, L3, L4): a P2MP LSP, R-L5: a P2P LSP, P2MP PW business 1 is used leaf L1, L2, L3 and L4; P2MP PW business 2 is used leaf L2, L3, L4 and L5.Wherein, L2, L3 and L4 are its shared leaf node.Fig. 4 is the Business Stream schematic diagram according to the P2MP PW1 of the embodiment of the invention, the figure shows a P2MP PW1 selects in the transmission to multiple spot LSP shown in Figure 3, as shown in Figure 4, leaf node L1 uses a P2P LSP transmit traffic data separately, because L2, L3, L4 are its shared leaf node, and they use a P2MP LSP transmit traffic data.Fig. 5 is the Business Stream schematic diagram according to the P2MP PW2 of the embodiment of the invention, the figure shows the transmission of another P2MP PW2 on P2MP LSP shown in Figure 3 and selects, as shown in Figure 5, because L2, L3, L4 are its shared leaf node, and they use same P2MP LSP transmit traffic data.Leaf node L5 uses a P2P LSP transmit traffic data separately.Describe below in conjunction with Fig. 3, Fig. 4 and Fig. 5.
The PW1 business only needs to use leaf node L1, L2, L3 and L4.Therefore, in layoutprocedure, only need to make the business datum of PW1 flow to above L1 node and L2, L3 and L4 leaf node by signaling label allocation binding relationship.Professional P2P LSP (R-L5) and the P2MP LSP transport service flow of using of PW2.Dispose corresponding label binding relation by signaling equally.By above configuration, reached and made the purpose of a point to two PW business of multiple spot LSP carrying.
Configuration mode can by the LDP agreement or similarly tag distribution protocol as the CR-LDP that has resource constraint etc.Mode by label binding, different P2MP PW business datums are assigned among the different FEC, and different FEC correspondences different label distribution and different forward-paths, thereby realizes different P2MP PW business is carried out the packet forwarding operation of different directions.
Need to prove that in Fig. 3, the Internet resources of the subpath of each leaf node correspondence can satisfy the requirement that many P2MP PW business transmit data simultaneously; In the present embodiment, the subpath of leaf node L2, L3 and L4 correspondence has the business datum that can satisfy PW1 and PW2 simultaneously and transmits needed Internet resources.
In sum,, solved and caused that Resource Allocation in Networks is dumb, resource is used inadequate problem, and then improved the flexibility of Resource Allocation in Networks, improved resource utilization by the foregoing description.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, carry out by calculation element thereby they can be stored in the storage device, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a bearing point is characterized in that to the method for multiple spot pseudo-line service, comprising:
On point-to-multipoint label switch paths P2MP LSP, carry out the configuration of point to multi-point pseudowire P2MP PW business, wherein, described P2MP PW business configuration is had on the P2MP LSP of identical leaf node with it, other leaf nodes except that described identical leaf node in the described P2MPPW business are being configured in addition on one or more P2MP LSP or the point-to-point label switched path P2P LSP;
Transmit the data of described P2MP PW business according to described configuration.
2. method according to claim 1, it is characterized in that, common leaf node in a plurality of P2MP PW business is configured on same the P2MPLSP, other leaf nodes except that described common leaf node in described a plurality of P2MPPW business are configured in addition on one or more P2MP LSP or the P2P LSP.
3. method according to claim 2 is characterized in that, the configuration of carrying out described P2MP PW business on described P2MP LSP comprises:
By label binding, different P2MP PW business configuration that will be on described P2MP LSP in different forwarding equivalence class FEC, wherein, the described different corresponding different label distribution and different forward-paths of FEC.
4. method according to claim 3 is characterized in that, realizes described label binding by tag distribution protocol.
5. method according to claim 3 is characterized in that, realizes described label binding by the tag distribution protocol of band resource constraint.
6. method according to claim 1 and 2 is characterized in that, the configuration of carrying out P2MP PW business on P2MP LSP comprises:
By management plane manual configuration P2MP PW business on P2MP LSP.
7. a device that carries P2MP PW business is characterized in that, comprising:
Configuration module, be used on P2MP LSP, carrying out the configuration of P2MP PW business, wherein, described P2MP PW business configuration is had on the P2MP LSP of identical leaf node with it, other leaf nodes except that described identical leaf node in the described P2MP PW business are being configured in addition on one or more P2MP LSP or the P2P LSP;
Transport module is used for transmitting according to described configuration the data of described P2MP PW business.
8. device according to claim 7, it is characterized in that, described configuration module is used for the common leaf node of a plurality of P2MP PW business is configured in same P2MPLSP, and other leaf nodes except that described common leaf node in described a plurality of P2MPPW business are configured in addition on one or more P2MP LSP or the P2P LSP.
9. device according to claim 8, it is characterized in that, described configuration module is used to by label binding, different P2MP PW business configuration that will be on P2MPLSP is in different forwarding equivalence class FEC, wherein, the described different corresponding different label distribution and different forward-paths of FEC.
10. according to claim 7 or 8 described devices, it is characterized in that described configuration module is used for by management plane manual configuration P2MP PW business on P2MPLSP.
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Application publication date: 20110615 |