CN101014008A - Classification processing method and network equipment for multi-protocol label switching service - Google Patents
Classification processing method and network equipment for multi-protocol label switching service Download PDFInfo
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Abstract
The invention discloses one MPLS business sort process method, wherein, the device divides the MPLS label into several sections through all sort of all transfer business to form each label range the equal polymer relationship; MPLS network device determines received label range through the relation between label range and transfer to determine transfer polymer and to execute relative process. The invention also discloses one multi-agreement label exchange business network device.
Description
Technical field
The present invention relates to MPLS (Multi Protocol Label Switch, multiprotocol label switching) technical field, relate in particular to a kind of one multi-agreement label exchange business processing method and the network equipment.
Background technology
Multiprotocol label switching, the label of fixed length encapsulates three layers of grouping and Layer 2 data frame with weak point, only transmits according to label on the MPLS network, and needn't need carry out complicated route querying as IP.MPLS packet header is 32 bits, as shown in Figure 1, wherein, 0 to 20 bit is that label value, 21 to 22 bits are that CoS (grade of service), 23 bits are S (storehouse indication, represent whether this label is the lowermost layer label), 24 to 32 bits are TTL (Time to Live, the time-to-live).
VPN (Virtual Private Network, Virtual Private Network) business is one of MPLS most important applications, MPLS VPN can be divided into L3VPN (Layer 3 VPN, three-layer VPN), L2VPN (Layer2 VPN, two-layer VPN) two big classes, and L2VPN can be divided into two kinds of VPLS (Virtual Private LANService, virtual special local area network service) and VPWS (Virtual Private Wire Service, the service of virtual private circuit).The application networking of above-mentioned three class vpn services can insert three types vpn service as shown in Figure 2 simultaneously on PE (carrier network edge, Provider Edge) equipment, the forwarding of carrying out is respectively separately handled:
L3VPN_CE (Customer Edge, customer edge) equipment 1 up L3VPN business arrives PE1 equipment, inquiry private network FIB (Forwarding Information Table, the forwarding information table) be pressed into private network tags 102 and public network label 105 after, by LSP (Label Switch Path, label switched path) through P (Provider, operator's internal unit) arrives opposite end PE2, PE2 equipment ejects public network label 104, and confirm that according to private network tags 102 VRF (VPN_Routing_Forwarding_Table, VPN route forwarding table) back inquiry private network fib tables E-Packet.
VPWS_CE1 is as the access device of user side, be responsible for customer service is sent to PE1 equipment by direct-connected circuit (AC), wherein, direct-connected circuit refers to that the user inserts the employed ATM of L2VPN system (Asynchronous Transfer Mode, asynchronous transfer mode) virtual circuit, FR (Frame Relay, frame relay) virtual circuit or ethernet vlan (Virtual Local Area Network, VLAN) link; PE1 is last will to support the L2VPN protocols, be included on the chain of command and set up the pseudo-circuit connection of PE1 to PE2 by signaling, finish the Layer 2 data isl frame on the data surface to the encapsulation of IP/MPLS mark bag/go encapsulation and respective handling function, and the mark bag is sent to opposite end PE2 by the pseudo-circuit in the PSN tunnel; PE1 is according to incoming interface and point-to-point PW (Pesudo-Wires, virtual link) after mapping relations is pressed into private network tags 101 and public network label 105, arrive opposite end PE2 by LSP and through P, P supports the transparent transmission of L2VPN Business Stream, do not support the L2VPN rules, only work to provide bearer path, the packet switch of setting up between the PE (PSN) tunnel can pass through a plurality of P routers; PE2 equipment ejects public network label 104, and E-Packets according to private network tags 101 and PW mapping relations.
At the professional PE1 equipment that arrives of the up VPLS of CE, after PE1 receives the ethernet frame that CE sends, will be according to (the Medium Access Control of the MAC in the frame, the medium access control) address is determined this frame is sent to another PE2 by the pseudo-circuit on which bar PSN tunnel, VSI (the Virtual Switch Interface of inquiry incoming interface correspondence, Virtual Switch Interface) after VPLS MAC gauge pressure is gone into private network tags 103 and public network label 105, arrive opposite end PE2 by LSP, PE2 equipment ejects public network label 104, and E-Packets according to inquiry VPLS MAC table behind the private network tags 103 affirmation VSI.
Existing MPLS label distribution adopts the method for salary distribution of every platform Label space and every interface Label space.Equipment all uses the tag information base of its maximum label range correspondence of supporting, various MPLS business are all unified to obtain unappropriated label in this tag information base, which and the use meaning of this label determined: i.e. corresponding FEC (the Forwarding Equivalence Class of this label, forwarding equivalence class) with which concrete business (grouping that the MPLS network equipment will have identical forwarding processing mode is classified as a class, identical as the destination, the forward-path that uses is identical, has the identical grade of service etc., this kind is called FEC, belongs to being grouped in the MPLS network of identical forwarding equivalence class and will obtain identical processing).As shown in Figure 3, the forwarding equivalence class of VRF1 gets access to label 101, the forwarding equivalence class of PW1 gets access to label 102, the forwarding equivalence class of PW2 gets access to label 103, the forwarding equivalence class of public network gets access to label 104, like this plant maintenance a label mapping table as shown in table 1, equipment carries out different business processing flows respectively behind the inquiry tag mapping table when the MPLS message is handled.
Table 1:
Label | Type of |
101 | ?VRF1(L3VPN) |
102 | ?PW1(VPWS) |
103 | ?PW2(VPLS) |
104 | ?FEC1(LSP) |
In the prior art, during MPLS network device processing MPLS message, before not having the inquiry tag mapping table, can't predict this tagged traffic type, thereby can't determine also which handling process this MPLS message enters, promptly can't instruct next step operation flow shunting from label itself, need further inquiry tag mapping table to determine.Suppose that certain MPLS network equipment need carry out ACL (Access Control List to VPLS message and L3VPN message, Access Control List (ACL)) branch flows to different engines processing, because each label all will expend an acl rule, and system can't provide so big ACL resource at all.
In addition, existing all professional shared overall Label space block models also cause the list item quantity of service label mapping table big, and will realize that related service and handling process divide time-like, and the contents in table complexity influences forward efficiency.
Summary of the invention
The problem to be solved in the present invention provides a kind of one multi-agreement label exchange business processing method and the network equipment, realize the polymerization classification and the label piecemeal of forwarding equivalence class, safeguard the mapping relations of each tag block and the polymerization of miscellaneous service forwarding equivalence class, can simply carry out the professional classification of MPLS by label itself and handle.
In order to realize above purpose, the embodiment of the invention provides a kind of one multi-agreement label exchange business processing method, may further comprise the steps:
The multiprotocol label switching MPLS network equipment is divided into some label range with the MPLS label, and by all the forwarding equivalence class polymerization classification with the MPLS business, forms the corresponding relation of each label range and forwarding equivalence class polymerization;
Label range in the MPLS business that the described MPLS network equipment is determined to receive under the label, and the corresponding relation by described label range and forwarding equivalence class polymerization, determine the forwarding equivalence class polymerization of described MPLS business, carry out the handling process of described forwarding equivalence class polymerization correspondence.
Described forwarding equivalence class polymerization comprises: by the forwarding equivalence class polymerization of the type setting of managing business, by the forwarding equivalence class polymerization of handling the veneer setting, by the forwarding equivalence class polymerization of service quality setting or the forwarding equivalence class polymerization that is provided with by the service-user object.
Described forwarding equivalence class polymerization by the type setting of managing business comprises the forwarding equivalence class of different disposal type of service; Described forwarding equivalence class polymerization by the setting of processing veneer comprises the forwarding equivalence class that belongs to different veneers; The described forwarding equivalence class that comprises different service quality by the forwarding equivalence class polymerization of service quality setting; Described forwarding equivalence class polymerization by the setting of service-user object comprises the forwarding equivalence class that belongs to the different user object.
Described label range comprises: tag block identifies tag piece or tag block.
Described tag block sign takies some bits of MPLS label.
Described tag block length is identical or different.
The invention also discloses a kind of one multi-agreement label exchange business and handle the network equipment, comprising: label range allocation units, correspondence relation storage and FEC polymerization classification processing unit;
Described label range allocation units are divided into some label range with the MPLS label;
Described correspondence relation storage is stored the corresponding relation of described each label range and forwarding equivalence class polymerization;
Described FEC polymerization classification processing unit, be connected with described correspondence relation storage, all forwarding equivalence class polymerizations of MPLS business are classified, and by the label range under the label in the MPLS business that receives, and the corresponding relation of label range and forwarding equivalence class polymerization in the described label range allocation units, call the handling process of the forwarding equivalence class polymerization of correspondence.
Described label range comprises: tag block identifies tag piece or tag block.
Described label range allocation units comprise that further a plurality of tag block are provided with subelement, and the MPLS label is divided into the identical or different tag block of length.
When described tag block length was identical, described tag block was provided with the some bits of subelement MPLS label and is set to the tag block sign.
Compared with prior art, the present invention has the following advantages:
The present invention makes the reduced range size in this piece tag block of MPLS label mapping table size of each forwarding equivalence class polymerization correspondence, the label list search efficiency of raising by setting in advance the corresponding relation of MPLS tag block and forwarding equivalence class polymerization; And can carry out the Business Processing classification flexibly, realize good Differentiated Services.
Description of drawings
Fig. 1 is MPLS label construction figure in the prior art;
Fig. 2 is VPN networking structure figure in the prior art;
Fig. 3 obtains the label schematic diagram by tag information base in the prior art;
Fig. 4 is a kind of one multi-agreement label exchange business process flow figure in the embodiment of the invention;
Fig. 5 is that the present invention uses the higher bit position to carry out the message structure figure of professional classification;
Fig. 6 is the structure chart of forwarding equivalence class polymerization of the present invention;
Fig. 7 is a kind of one multi-agreement label exchange business network equipment structure chart in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of method that professional classification is handled to MPLS, as shown in Figure 4, may further comprise the steps:
Step s401, the MPLS network equipment is divided into some label range with the MPLS label, and by all the forwarding equivalence class polymerization classification with the MPLS business, forms the corresponding relation of each label range and forwarding equivalence class polymerization.Wherein, label range can be a tag block, also can be tag block and tag block sign.Tag block is corresponding one by one with professional forwarding equivalence class polymerization, such as: the forwarding equivalence class polymerization that certain tag block correspondence is provided with by the type of managing business, certain tag block correspondence by handling the forwarding equivalence class polymerization of forwarding equivalence class polymerization that forwarding equivalence class polymerization that veneer is provided with, certain tag block correspondence be provided with by service quality or certain tag block correspondence by the setting of service-user object.
Step s402, label range in the MPLS business that the MPLS network equipment is determined to receive under the label, and the corresponding relation by label range and forwarding equivalence class polymerization, determine the forwarding equivalence class polymerization of MPLS business, carry out the handling process of described forwarding equivalence class polymerization correspondence.Wherein, the forwarding equivalence class that comprises the different disposal type of service by the forwarding equivalence class polymerization of the type setting of managing business; Comprise the forwarding equivalence class that belongs to different veneers by the forwarding equivalence class polymerization of handling the veneer setting; The forwarding equivalence class that comprises different service quality by the forwarding equivalence class polymerization of service quality setting; Forwarding equivalence class polymerization by the setting of service-user object comprises the forwarding equivalence class that belongs to the different user object.
FEC refers to the drive source of the MPLS network equipment to other devices allocation MPLS label in the present invention, this FEC is interpreted as a public network route in public network, can be understood as a VRF VPN route in L3VPN, is interpreted as a VC in VPWS, in VPLS, be interpreted as a PW, and the like.FEC among the present invention expands a kind of extension of the FEC that defines among the RFC, can be according to some feature difference of these a series of FEC, carry out FEC polymerization classification, as shown in table 2, FEC behavior, service-user object etc. be can be handled according to the type of managing business, service processing board, QoS and FEC polymerization and classification carried out.
Table 2:
The FEC criteria for classification | FEC polymerization tabulation |
By the classification of type of managing business | The FEC of lsp tunnel business |
The FEC of L3VPN business | |
The FEC of VPWS business | |
The FEC of VPLS business | |
Press the service processing board classification | FEC in veneer 1 processing |
FEC in veneer 2 processing | |
FEC in veneer 3 processing | |
Press QoS processing behavior classification | The FEC that limit priority is handled |
The FEC that higher priority is handled | |
The FEC that normal priority is handled | |
Transmit the FEC that handles as possible | |
Press the classification of service-user object | The FEC of customer group A |
The FEC of customer group B | |
The FEC of customer group C |
FEC polymerization sorting item number according to certain above-mentioned FEC criteria for classification, can be successively with whole M PLS label [16,1048575] be divided into the continuous tag block of label of corresponding number, the business that belongs to same polymeric type is used independently a tag block or a label range.As shown in Figure 6: as a forwarding equivalence class polymerization, corresponding label piece 1, the MPLS network equipment use the label in the tag block 1 when belonging to such other FEC distributing labels with FEC1, FEC2, FEC3; As a forwarding equivalence class polymerization, corresponding label piece 2, the MPLS network equipment use the label in the tag block 2 when belonging to such other FEC distributing labels with FEC4, FEC5, FEC6; As a forwarding equivalence class polymerization, corresponding label piece 3, the MPLS network equipment use the label in the tag block 3 when belonging to such other FEC distributing labels with FEC7, FEC8, FEC9.By such processing, MPLS tag block itself promptly can form a kind of simple mapping relations with between the FEC polymerization, when the different polymeric type processing of FEC in the MPLS network equipment need be classified or shunt, equipment can directly be discerned the FEC polymeric type of message correspondence according to the tag block under the label of MPLS message, and then finishes classification or shunting to whole M PLS service message.
At four kinds of types of service of the prior art, can be divided into four bulks to whole M PLS label [16,1048575], the corresponding a kind of professional forwarding equivalence class polymerization of each piece tag block, mapping relations are as shown in table 3, and wherein the MPLS label [0,15] keep, do not participate in classification.Be that the label corresponding service type of scope in [16,52143] is the FEC of lsp tunnel business; Scope is the FEC of L3VPN business in the label corresponding service type of [52144,524287]; Scope is the FEC of VPWS business in the label corresponding service type of [524288,786431]; Scope is the FEC of VPLS business in the label corresponding service type of [786432,1048575].
Table 3:
Label range | Professional forwarding equivalence class polymeric type |
[16,52143] | The FEC of lsp tunnel business |
[52144,524287] | The FEC of L3VPN business |
[524288,786431] | The FEC of VPWS business |
[786432,1048575] | The FEC of VPLS business |
Like this, the MPLS network equipment can be made business processing flow according to above-mentioned simple mapping relations when handling the MPLS message.Wherein, label range can be provided with according to concrete professional forwarding equivalence class polymeric type, and the label range of different business forwarding equivalence class polymeric type correspondence can be continuous, also can be discontinuous; Label range length for different business forwarding equivalence class polymeric type can be identical, also can be inequality.
If label range is provided with rationally, can use high several bit of MPLS message label value to carry out the professional forwarding equivalence class polymeric type of message: as shown in Figure 5, be used to identify the forwarding equivalence class polymeric type with high 3 bit of label are independent, adopting high (or low) 2 bit or high 4 bit certainly, independent to be used to identify the forwarding equivalence class polymeric type also passable.Because label has only local significance, the MPLS network equipment distributes the different label of high 3bit to get final product according to the forwarding equivalence class polymeric type in for certain forwarding equivalence class polymeric type distributing labels, and is as shown in table 4:
Table 4:
The high 3bit value of label | The corresponding label scope | Corresponding service forwarding equivalence class polymerization classification |
000 | [16,131071] | The FEC of lsp tunnel business |
001 | [131072,262143] | The FEC of L3VPN business |
010 | [262144,393215] | The FEC of L3VPN business |
011 | [393216,524287] | The FEC of L3VPN business |
100 | [524288,655359] | The FEC of VPWS business |
101 | [655360,786431] | The FEC of VPLS business |
110 | [786432,917503] | The FEC of VPLS business |
111 | [917504,1048575] | The FEC of VPLS business |
In the table 4, according to each business characteristic, the tag block capacity that different business uses also can be different, and the tag block size of promptly professional forwarding equivalence class polymeric type correspondence can not exclusively be divided equally: professional forwarding equivalence class polymerization of L3VPN and VPLS volume of business are bigger, and every kind of business all occupies 3 respectively
*128
*1024 labels, other business all occupy 128
*1024 labels.
In like manner, if the MPLS network equipment supports the QoS of 4 kinds of priority to handle, the MPLS network equipment also can be handled behavior according to QoS L3VPN business and public network LSP tunnel traffic are carried out FEC polymerization and tag block division.As shown in table 5: the VRF scope of L3VPN is [1 in the equipment, 400] between, the IP address range of public network LSP tunnel traffic is at [xx.0.1/24, xx.255.1/24] between, the FEC of two kinds of business carries out the polymerization classification according to QoS processing behavior respectively, a part of FEC of the part of L3VPN business and public network LSP business aggregates into a classification, and the MPLS business of this classification is gone into same QoS formation and carried out that All factors being equal, preference will be give to level is handled.Simultaneously, the Label space of equipment [16,524287] according to FEC polymerization classification, is divided corresponding tag block scope.Certainly, classifying according to QoS processing behavior also to comprise the FEC of the professional and VPLS business of VPWS, unlisted in the table.
Table 5:
The corresponding label scope | Corresponding FEC polymerization classification | QoS handles behavior |
[16,131071] | VRF[1,100] IP[x.x.0.1/24,x.x.63.1/24] | Limit priority is processed into formation 1 |
[131072,262143] | VRF[101,200] IP[x.x.64.1/24,x.x.127.1/24] | Higher priority is processed into formation 2 |
[262144,393215] | VRF[201,300] IP[x.x.128.1/24,x.x.191.1/24] | Normal priority is processed into formation 3 |
[393216,524287] | VRF[301,400] IP[x.x.192.1/24,x.x.255.1/24] | Transmit as possible and be processed into formation 4 |
In the table 5, the QoS polymerization of MPLS network equipment FEC classification can be specified by configuration order by the user, also can force treaty rule voluntarily in the MPLS network equipment.
The embodiment of the invention also provides a kind of one multi-agreement label exchange business network equipment, comprises as shown in Figure 7: label range allocation units 100, FEC polymerization classification processing unit 200 and correspondence relation storage 300.Label range allocation units 100 comprise that a plurality of tag block are provided with subelement 101,102 etc., label range allocation units 100 are divided into some label range with the MPLS label, the corresponding tag block of each label range is provided with subelement, for example first label range corresponding label piece is provided with subelement 101, second label range corresponding label piece is provided with subelement 102, and the like.
FEC polymerization classification processing unit 200 is classified all forwarding equivalence class polymerizations of MPLS business, and by the label range under the label in the MPLS business that receives, and the corresponding relation of label range and forwarding equivalence class polymerization in the described label range allocation units, call the handling process of the forwarding equivalence class polymerization of correspondence.FEC polymerization classification processing unit 200 comprises that a plurality of classification handle subelements 201,202 etc., and each classification is handled subelement and realized the professional forwarding equivalence class polymerization classification of different MPLS handling process.Wherein, all forwarding equivalence class polymerizations of MPLS business are classified specifically comprise: the forwarding equivalence class polymerization that is provided with by the type of managing business, by forwarding equivalence class polymerization of handling forwarding equivalence class polymerization that veneer is provided with, being provided with by service quality or the forwarding equivalence class polymerization that is provided with by the service-user object.The forwarding equivalence class that comprises the different disposal type of service by the forwarding equivalence class polymerization of the type setting of managing business, comprise the forwarding equivalence class that belongs to different veneers by the forwarding equivalence class polymerization of handling the veneer setting, comprise the forwarding equivalence class of different service quality by the forwarding equivalence class polymerization of service quality setting, comprise the forwarding equivalence class that belongs to the different user object by the forwarding equivalence class polymerization of service-user object setting.
Correspondence relation storage 300 is connected with FEC polymerization classification processing unit 200 with label range allocation units 100, store the corresponding relation of the professional forwarding equivalence class polymerization of each label range and MPLS, promptly finish tag block mapping between subelement and classification processing subelement is set.Wherein, it can be tag block that each tag block is provided with the label range that exists in the subelement, also can be the tag block block identification that tags.When MPLS network device processing MPLS was professional, by the searching label correspondence relation storage 300 in the MPLS business datum, subelement was handled in the different forwarding equivalence class polymerization classification in the FEC polymerization classification processing unit of determining to enter 200.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1, a kind of one multi-agreement label exchange business processing method is characterized in that, may further comprise the steps:
The multiprotocol label switching MPLS network equipment is divided into some label range with the MPLS label, and by all the forwarding equivalence class polymerization classification with the MPLS business, forms the corresponding relation of each label range and forwarding equivalence class polymerization;
Label range in the MPLS business that the described MPLS network equipment is determined to receive under the label, and the corresponding relation by described label range and forwarding equivalence class polymerization, determine the forwarding equivalence class polymerization of described MPLS business, carry out the handling process of described forwarding equivalence class polymerization correspondence.
2, one multi-agreement label exchange business processing method according to claim 1, it is characterized in that described forwarding equivalence class polymerization comprises: by the forwarding equivalence class polymerization of the type setting of managing business, by the forwarding equivalence class polymerization of handling the veneer setting, by the forwarding equivalence class polymerization of service quality setting or the forwarding equivalence class polymerization that is provided with by the service-user object.
3, as one multi-agreement label exchange business processing method as described in the claim 2, it is characterized in that described forwarding equivalence class polymerization by the type setting of managing business comprises the forwarding equivalence class of different disposal type of service; Described forwarding equivalence class polymerization by the setting of processing veneer comprises the forwarding equivalence class that belongs to different veneers; The described forwarding equivalence class that comprises different service quality by the forwarding equivalence class polymerization of service quality setting; Described forwarding equivalence class polymerization by the setting of service-user object comprises the forwarding equivalence class that belongs to the different user object.
4, as one multi-agreement label exchange business processing method as described in claim 1 or 2 or 3, it is characterized in that described label range comprises: tag block sign tag piece or tag block.
As one multi-agreement label exchange business processing method as described in the claim 4, it is characterized in that 5, described tag block sign takies some bits of MPLS label.
6, as one multi-agreement label exchange business processing method as described in the claim 4, it is characterized in that described tag block length is identical or different.
7, a kind of one multi-agreement label exchange business network equipment is characterized in that, comprising: label range allocation units, correspondence relation storage and FEC polymerization classification processing unit;
Described label range allocation units are divided into some label range with the MPLS label;
Described correspondence relation storage is stored the corresponding relation of described each label range and forwarding equivalence class polymerization;
Described FEC polymerization classification processing unit, be connected with described correspondence relation storage, all forwarding equivalence class polymerizations of MPLS business are classified, and by the label range under the label in the MPLS business that receives, and the corresponding relation of label range and forwarding equivalence class polymerization in the described label range allocation units, call the handling process of the forwarding equivalence class polymerization of correspondence.
8, as the one multi-agreement label exchange business network equipment as described in the claim 7, it is characterized in that described label range comprises: tag block sign tag piece or tag block.
9, as the one multi-agreement label exchange business network equipment as described in the claim 8, it is characterized in that described label range allocation units comprise that further a plurality of tag block are provided with subelement, and the MPLS label is divided into the identical or different tag block of length.
As the one multi-agreement label exchange business network equipment as described in the claim 9, it is characterized in that 10, when described tag block length was identical, described tag block was provided with the some bits of subelement MPLS label and is set to the tag block sign.
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CN105959253A (en) * | 2015-11-19 | 2016-09-21 | 中国银联股份有限公司 | Method and device for determining data flow to be cleaned |
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