CN102143080A - Label allocation method, system and device for multi-protocol label switching network - Google Patents
Label allocation method, system and device for multi-protocol label switching network Download PDFInfo
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Abstract
The invention discloses a label allocation method, a label allocation system and a label allocation device for a multi-protocol label switching network. The method comprises that: a provider edge applies for a first label block for a customer edge, determines an in-label corresponding to the customer edge according to the first label block, and transmits first network layer reachable information to inform an opposite-end neighbor provider edge of the first label block, wherein the size of the first label block is 1, and the offset of the first label block is an identification number of an opposite-end customer edge; and the provider edge receives information from the neighbor provider edge, and determines an out-label corresponding to the customer edge according to a received second label block, wherein the information received from the neighbor provider edge is the second network reachable information of the second label block applied for by the opposite-end customer edge, the size of the second label block is 1, and the offset of the second label block is the identification number of the customer edge. By the method, the label blocks with the size of 1 are allocated and transmitted, thereby saving a label space and system resources.
Description
Technical field
The present invention relates to communication technical field, refer to a kind of multiprotocol label switching (Multiprotocol LabelSwitching, MPLS) label distribution method in the network, system and device especially.
Background technology
Multiprotocol label switching MPLS network is to utilize the technology that label (label) carries out at a high speed, efficient data is transmitted, it is the focus of L2vpn technology, the data that transmit in the MPLS network need be carried out routing by label when data transmit with the label of going up fixed-length field in the MPLS network from the source address to the destination address.
The L2vpn technology mainly contains three types: virtual dedicated line service (Virtual Private Wire Service, VPWS), virtual special local area network service (Virtual Private Lan Service, VPLS) and the Internet-specific LAN services (IP LAN Service, IPLS).In the control aspect employing tag distribution protocol (Label Distribution Protocol, Martini scheme LDP) and employing Border Gateway Protocol (BorderGateway Protocol, two kinds of solutions of Kompella scheme BGP) are arranged.The Kompella scheme has at the BGP of VPWS to be found and signaling realization Layer 2 virtual private network (draft-kompella-l2vpn-l2vpn-04.txt) draft and at the standard RFC 4761 of VPLS automatically.
As shown in Figure 1, be existing VPWS network topology example.Comprise provider edge equipment PE1, PE2 and PE3 etc. in this network topology, the customer edge devices CE1 that is connected with PE1, CE2 etc., customer edge devices CE3 of being connected with PE2 etc., the customer edge devices CE4 that is connected with PE3, CE5 etc.The provider edge equipment that can pass through to be connected between the customer edge devices is set up point-to-point VPWS service.
When setting up point-to-point VPWS service between the customer edge devices, provider edge equipment need be the client edge device distributing labels that is connected, and announce the provider edge equipment of connecting for the opposite end customer edge devices, specifically can be by bgp update (UPDATE) message announcement.
When realizing the label information announcement in the prior art, need reserve a tag block according to the network planning and carry to arrive and specify tag set CE, continuous, the quantity of the size of this tag block CE equipment in the network during according to the network planning is determined.Like this when increasing CE equipment newly in the network, the PE equipment that it connected just can apply for directly that a tag block is embodied as CE devices allocation label, and not influencing other CE equipment that has distributed label and PE equipment, the tag block of this reservation realizes that the mode of label distribution can reduce the netconfig job amount greatly.PE equipment uses tag block to the label of the PE of opposite end devices advertise as the CE devices allocation after the tag block that has been the new CE equipment application that inserts.The bgp network layer that is used to announce label information can reach information (Network Layer Reachability Information, NLRI) comprise in: parameters such as CE sign (CE ID), the skew of CE piece, CE block size, label radix can calculate institute's distributed labels by these parameters.
Because the size of tag block is relevant with CE number of devices in the system, when the scope of the ID leap of two customer edge devices that are in point-to-point VPWS service opposite end was big more, needed tag block size was also big more.For example: CE ID is that 1 customer edge devices will be that 256 customer edge devices is set up point-to-point VPWS service with a long-range CE ID, and then the scope of CE ID is 256, and need the size of the tag block of application this moment just is 256.But in fact the PE device just will just can satisfy the demand of transfer of data for label of CE devices allocation, and the tag block of application has been reserved 256 labels, therefore taken extra Label space, caused the waste of label resources, and then owing to system resource takies the more entire system performance that influences, for low side devices even can reduce the L2vpn service capacity greatly.
Summary of the invention
The embodiment of the invention provides label distribution method, system and the device in a kind of multi-protocol label switching network, and the outer Label space of occupying volume when solving in the prior art mode distributing labels with tag block causes the problem of label resources waste.
Label distribution method in a kind of multi-protocol label switching network comprises:
Provider edge equipment is customer edge devices application first tag block, and determines that according to first tag block of application the label of going into of customer edge devices correspondence, the size of described first tag block are 1, side-play amount is the identification number of opposite end customer edge devices; And send first tag block that first Network Layer Reachable Information will apply for and announce neighbours' provider edge equipment to the opposite end;
Provider edge equipment receives second Network Layer Reachable Information of second tag block that is advertised as opposite end customer edge devices application that neighbours' provider edge equipment sends, and the size of described second tag block is 1, side-play amount is the identification number of customer edge devices; And the outgoing label of determining the customer edge devices correspondence according to second tag block that receives.
Label distribution device in a kind of multi-protocol label switching network comprises:
Label application module is used to customer edge devices application first tag block, and the size of described first tag block is 1, side-play amount is the identification number of opposite end customer edge devices;
Signal dispatcher module is used to send first tag block that first Network Layer Reachable Information will apply for and announces neighbours' provider edge equipment to the opposite end; And second Network Layer Reachable Information that receives second tag block that is advertised as opposite end customer edge devices application that neighbours' provider edge equipment sends, the size of described second tag block is 1, side-play amount is the identification number of customer edge devices;
The tag computation module is used for determining the label of going into of customer edge devices correspondence according to first tag block of application; And/or according to the outgoing label of the true customer edge devices correspondence of second tag block that receives.
A kind of provider edge equipment comprises: the label distribution device in the above-mentioned multi-protocol label switching network.
Label distribution system in a kind of multi-protocol label switching network comprises: some above-mentioned provider edge equipments and the plurality of client edge device that is connected with described provider edge equipment.
Beneficial effect of the present invention is as follows:
Label distribution method in the multi-protocol label switching network that the embodiment of the invention provides, system and device, when being the customer edge devices distributing labels, only distributing a size is 1 label, side-play amount by label is set to the identification number of opposite end customer edge devices and realizes, obtains into label according to the label of application.What neighbours' provider edge equipment transmitted also is that size is 1 tag block, and recognizing size that neighbours' provider edge equipment distributed by the label side-play amount is 1 label, obtains outgoing label in view of the above.Realized that like this distribution and transmission size are 1 tag block, thereby saved Label space and system resource, further saved network transmission resource, improved the systematic function of provider edge equipment and optimized the label distribution scheme.
Description of drawings
Fig. 1 is the exemplary plot of VPWS network topology in the prior art;
Fig. 2 is the flow chart of label distribution method in the embodiment of the invention;
Fig. 3 is the structural representation of label distributor in the embodiment of the invention.
Embodiment
Label distribution need take too much Label space in the prior art in order to solve, the problem of waste label resources, the embodiment of the invention provides the label distribution method in a kind of multi-protocol label switching network, be implemented in and carry out label distribution in the multi-protocol label switching network as shown in Figure 1, and can save Label space and not waste label resources.
Label distribution method in the multi-protocol label switching network that the embodiment of the invention provides, its flow process as shown in Figure 2, execution in step is as follows:
Step S101: provider edge equipment need be the customer edge devices distributing labels.
Insert as new customer edge devices, and need set up ptp services with the opposite end customer edge devices time, provider edge equipment need be the customer edge devices distributing labels.
For example: insert a new customer edge devices CE6 in the system shown in Figure 1 on provider edge equipment PE2, this CE6 need set up ptp services with the CE5 that is connected to PE3.Wherein the ID of CE6 is 1, the ID of CE5 is 256.
Step S102: judge whether to have started label and save allocation model.
Provider edge equipment judges whether to have started label and saves allocation model, is that customer edge devices distributed labels block size is 1 under this pattern.Provider edge equipment can determine whether that needs start label and save allocation model according to the operating position of Label space.For example when the utilization rate of Label space reaches certain value, start label and save allocation model, also can start label according to other entry condition and save allocation model.
Continue to use the example of top, PE2 judges whether to have started label and saves allocation model.
If, execution in step S104; Otherwise, execution in step S103.
Step S103: according to existing label distribution protocol regulation applying label piece and calculate label.
When not starting label saving allocation model, carry out label distribution and the calculating that goes out, goes into label according to existing protocol.
Continue to use the example of top, according to existing protocol, PE2 is that the size of the tag block of CE6 application is determined by the included scope of the ID of two CE of the opposite end that is positioned at ptp services, such as being 256.Wherein the side-play amount of label is 1, when PE3 announced, the information in the Network Layer Reachable Information comprised: the identification number of CE6, the side-play amount of tag block, the size of tag block and label radix, such as CE ID is 1, the side-play amount 1 of tag block, the size 256 of tag block and label radix 1034.PE2 sends to PE3 with Network Layer Reachable Information.
Above-mentioned steps S102 is an optional step, can be after execution in step S101, and direct execution in step S104, what promptly think acquiescence is to have started label to save allocation model, and no longer judges.
Step S104: provider edge equipment is customer edge devices application first tag block, and wherein the size of first tag block is 1, side-play amount is the identification number of opposite end customer edge devices.
When having started label saving allocation model, it for customer edge devices application size 1 tag block, this moment, the side-play amount of tag block was the identification number of opposite end customer edge devices, in the time of could guaranteeing that like this tag block of applying for is announced to neighbours' provider edge equipment, can accurately discern and determine the label of being applied for.
Continue to use the example of top, PE2 is that the size of the tag block of CE6 application is 1.Wherein the side-play amount of label is 1, when PE3 announces, information in first Network Layer Reachable Information comprises: the identification number of CE6, the side-play amount of tag block, the size of tag block and label radix, such as CE ID is 1, the side-play amount of tag block is 256, the tag block size be 1 and the label radix be 1034.This moment, the side-play amount of tag block was the identification number of the CE5 of opposite end.
Step S105: first tag block according to application is determined the label of going into of customer edge devices correspondence, and sends first tag block that first Network Layer Reachable Information will apply for and announce neighbours' provider edge equipment to the opposite end.
Determine specifically to comprise the label of going into of customer edge devices correspondence according to first tag block of application: calculate according to the identification number of the label cardinal sum side-play amount of first tag block, opposite end customer edge devices customer edge devices correspondence go into label.By going into the data that neighbours' provider edge equipment that tag recognition receives sends are to send to which local customer edge devices.
Wherein: go into label=label radix+opposite end customer edge devices identification number-side-play amount.
Continue to use the example of top, PE2 is according to the attribute information of first tag block of application: label radix 1034 and side-play amount 256, and the identification number of the CE5 of opposite end calculates into label, the go into label corresponding with CE6 that calculates is 1034+256-256=1034.
Send first tag block that first Network Layer Reachable Information will apply for and announce provider edge equipment to neighbours, specifically comprise: provider edge equipment writes size, tag block side-play amount and the label radix of first tag block of the identification number of customer edge devices, application in first Network Layer Reachable Information, and first Network Layer Reachable Information is sent to neighbours' provider edge equipment.
Continue to use the example of top, PE2 sends to PE3 with first Network Layer Reachable Information, and to announce the tag block that it is CE6 application, the CE ID in first Network Layer Reachable Information is 1, the side-play amount of tag block is 256, the tag block size be 1 and the label radix be 1034.
Step S106: provider edge equipment receives second Network Layer Reachable Information of second tag block that is advertised as opposite end customer edge devices application of neighbours' provider edge equipment transmission.Wherein, the size of second tag block is 1, side-play amount is the identification number of customer edge devices.
Neighbours' provider edge equipment is opposite end customer edge devices application second tag block, size, tag block side-play amount and the label radix of second tag block of the identification number of opposite end customer edge devices, application are write in second Network Layer Reachable Information, second Network Layer Reachable Information is sent to provider edge equipment, and provider edge equipment receives second Network Layer Reachable Information that neighbours' provider edge equipment sends.
Continue to use the example of top, neighbours' provider edge equipment PE3 is that the CE5 that is connected applies for second tag block, wherein the side-play amount of label is 1, when PE2 announces, information in the Network Layer Reachable Information is comprised: the identification number of CE5, the side-play amount of tag block, size and label radix are 256 such as CE ID, the side-play amount of tag block is 1, the tag block size be 1 and the label radix be 739.PE3 sends to PE2 with second Network Layer Reachable Information.This moment, the side-play amount of tag block was the identification number of the CE6 of opposite end.
The execution sequence of above-mentioned steps S105 and step S106 in no particular order, step S107 carries out after step S106 and gets final product.
Step S107: the outgoing label of determining the customer edge devices correspondence according to second tag block that receives.Specifically comprise:
Calculate outgoing label according to the label cardinal sum side-play amount of second tag block, the identification number of customer edge devices.Which opposite end customer edge devices is the data that send by outgoing label sign native client edge device send to.Wherein: outgoing label=label radix+native client edge device identification number-side-play amount.
Continue to use the example of top, the attribute information of second tag block of PE3 announcement: label radix 739 and tag block side-play amount 1, and the identification number of local CE6 calculates label, the outgoing label that calculates is 739+1-1=739.
Said method is to describe outgoing label and definite process of going into label from the provider edge equipment angle.Corresponding neighbours' provider edge equipment also can be carried out identical operations, and its operation process is obtained outgoing label with reference to above-mentioned provider edge equipment and gone into the implementation procedure of label, describes no longer one by one herein.Wherein:
The formula that neighbours' provider edge equipment calculates label is: outgoing label=label radix+native client edge device identification number-side-play amount, side-play amount herein and label radix are the relevant parameter in first tag block of provider edge equipment announcement, and native client edge device identification number is meant the identification number of the customer edge devices that is connected with neighbours' provider edge equipment.
Continue to use the example of top, when PE3 receives the Network Layer Reachable Information of PE2 transmission, according to label radix 1034 that wherein carries and side-play amount 256, and the identification number of the CE5 that is connected calculates label, the outgoing label that calculates is 1034+256-256=1034, calculating into label identically with PE2, all is the data that are used to identify CE6.
The formula that neighbours' provider edge equipment calculates label is: go into label=label radix+opposite end customer edge devices identification number-side-play amount, side-play amount herein and label radix are the relevant parameter in second tag block of native client edge device application for neighbours' provider edge equipment, and opposite end customer edge devices identification number is meant the identification number of the customer edge devices that is connected with provider edge equipment.
Continue to use the example of top, PE3 is that CE5 applies for that the label of going into that calculates after second tag block is: 739+1-1=739, to calculate outgoing label identical with PE2, all is the data that are used to identify CE5.
That is to say that PE3 sends to CE5 by the data of going into tag recognition PE2 transmission, the data that identify CE5 by outgoing label send to CE6.
As shown in table 1 below is the Network Layer Reachable Information of announcing behind the CE6 applying label piece for neighbours' provider edge equipment PE3 receives PE2 by existing protocol, with PE3 receive PE2 by label save allocation model be CE6 apply for announcing after first tag block the ins and outs contrast of Network Layer Reachable Information.
Table 1
By above-mentioned table 1 as can be seen: the side-play amount of each tag block of existing protocol all is since 1, and neighbours' provider edge equipment need find the corresponding label of ID (such as 256) with the native client edge device when determining the label of native client edge device.For example tag block is that label from identification number 1 correspondence begins, and determine the label of identification number 256 correspondences, then needs to find the 256th label to be only desired outgoing label.And among the present invention from opposite end customer edge devices identification number (CE ID), so just be the equal of initial its local customer edge devices ID that is that tells its tag block of neighbours' provider edge equipment, just first label correspondence in the tag block the customer edge devices ID of neighbours' provider edge equipment this locality, for example tag block is that label from identification number 256 correspondences begins, and the identification number of native client edge device is exactly 256, therefore, first label is desired outgoing label.
The tag block size that existing protocol sends is 256, comprises label 1034～1289 totally 256 labels.The label block size then is 1 only to comprise label 1034 these labels and get final product among the present invention.
PE2 is respectively according to receiving the outgoing label that Network Layer Reachable Information calculates: existing protocol obtain outgoing label be 1289 and the outgoing label that obtains of the present invention be 1034.
Label distribution method in the above-mentioned multi-protocol label switching network that provides based on the embodiment of the invention, label distribution device in the multi-protocol label switching network that the embodiment of the invention also provides, this device can be arranged in any one provider edge equipment, for example can be realized by the BGP module in the provider edge equipment.The structure of this device comprises as shown in Figure 3: label application module 10, signal dispatcher module 20 and tag computation module 30.
Preferably, above-mentioned signal dispatcher module 20, specifically be used for: size, the label cardinal sum side-play amount of first tag block of the identification number of customer edge devices, application are write first Network Layer Reachable Information, first Network Layer Reachable Information is sent to neighbours' provider edge equipment.
Preferably, above-mentioned tag computation module 30 specifically is used for: calculate according to the identification number of the label cardinal sum side-play amount of first tag block, opposite end customer edge devices customer edge devices correspondence go into label; And/or calculate outgoing label according to the label cardinal sum side-play amount of second tag block, the identification number of customer edge devices.
Label distribution method in the above-mentioned multi-protocol label switching network that provides based on the embodiment of the invention, the multi-protocol tag switching network system that the embodiment of the invention also provides can comprise some provider edge equipments and the plurality of client edge device that is connected with each provider edge equipment.Customer edge devices can be set up ptp services with other customer edge devices, other customer edge devices of having set up ptp services with customer edge devices are its opposite end edge device, and the provider edge equipment that the opposite end customer edge devices is connected is neighbours' provider edge equipment of the provider edge equipment that customer edge devices connects.
Label distribution method in the above-mentioned multi-protocol label switching network is not only applicable in the VPWS network optimization to draft-kompella-l2vpn-l2vpn-04.txt draft technology, equally also be applicable in other multiprotocol label switching MPLS network and carry out label distribution, so long as when label mode is saved in operation, only need and send long-range neighbours PE equipment to, get final product to reach the purpose of alleviating system label resource anxiety for label of CE devices allocation of being connected.
Label distribution method in the multi-protocol label switching network that the embodiment of the invention provides, system and device, the identification number that side-play amount by label is set to the opposite end customer edge devices is embodied as customer edge devices, and to distribute a size be that 1 label and the size that receives the announcement of neighbours' provider edge equipment are 1 tag block, obtains into label and outgoing label.By distributing and transmitting size is 1 tag block, has saved Label space and system resource, and the label application of having avoided the label resources anxiety to be caused is failed; Further saved network transmission resource, improved the systematic function of provider edge equipment and optimized the label distribution scheme.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. the label distribution method in the multi-protocol label switching network is characterized in that, comprising:
Provider edge equipment is customer edge devices application first tag block, and determines that according to first tag block of application the label of going into of customer edge devices correspondence, the size of described first tag block are 1, side-play amount is the identification number of opposite end customer edge devices; And send first tag block that first Network Layer Reachable Information will apply for and announce neighbours' provider edge equipment to the opposite end;
Provider edge equipment receives second Network Layer Reachable Information of second tag block that is advertised as opposite end customer edge devices application that neighbours' provider edge equipment sends, and the size of described second tag block is 1, side-play amount is the identification number of customer edge devices; And the outgoing label of determining the customer edge devices correspondence according to second tag block that receives.
2. the method for claim 1 is characterized in that, described first tag block according to application is determined the label of going into of customer edge devices correspondence, specifically comprises:
Calculate according to the identification number of the label cardinal sum side-play amount of first tag block, opposite end customer edge devices customer edge devices correspondence go into label.
3. the method for claim 1 is characterized in that, first tag block that described transmission first Network Layer Reachable Information will be applied for is announced the provider edge equipment to neighbours, specifically comprises:
Provider edge equipment writes size, the label cardinal sum side-play amount of first tag block of the identification number of customer edge devices, application in first Network Layer Reachable Information, and first Network Layer Reachable Information is sent to neighbours' provider edge equipment.
4. the method for claim 1 is characterized in that, described provider edge equipment receives second Network Layer Reachable Information of second tag block that is advertised as opposite end customer edge devices application of neighbours' provider edge equipment transmission, specifically comprises:
Neighbours' provider edge equipment is opposite end customer edge devices application second tag block, size, the label cardinal sum side-play amount of second tag block of the identification number of opposite end customer edge devices, application are write in second Network Layer Reachable Information, second Network Layer Reachable Information is sent to provider edge equipment;
Provider edge equipment receives second Network Layer Reachable Information that neighbours' provider edge equipment sends.
5. the method for claim 1 is characterized in that, second tag block that described basis receives is determined the outgoing label of customer edge devices correspondence, specifically comprises:
Calculate outgoing label according to the label cardinal sum side-play amount of second tag block, the identification number of customer edge devices.
6. as the arbitrary described method of claim 1-5, it is characterized in that, also comprise:
Provider edge equipment is before customer edge devices application first tag block, judges whether to start label and saves allocation model;
When being judged as when being, be implemented as the step of customer edge devices application first tag block; Otherwise, according to existing label distribution protocol regulation applying label piece.
7. the label distribution device in the multi-protocol label switching network is characterized in that, comprising:
Label application module is used to customer edge devices application first tag block, and the size of described first tag block is 1, side-play amount is the identification number of opposite end customer edge devices;
Signal dispatcher module is used to send first tag block that first Network Layer Reachable Information will apply for and announces neighbours' provider edge equipment to the opposite end; And second Network Layer Reachable Information that receives second tag block that is advertised as opposite end customer edge devices application that neighbours' provider edge equipment sends, the size of described second tag block is 1, side-play amount is the identification number of customer edge devices;
The tag computation module is used for determining the label of going into of customer edge devices correspondence according to first tag block of application; And/or according to the outgoing label of the true customer edge devices correspondence of second tag block that receives.
8. device as claimed in claim 7 is characterized in that, described signal dispatcher module specifically is used for:
Size, the label cardinal sum side-play amount of first tag block of the identification number of customer edge devices, application are write in first Network Layer Reachable Information, first Network Layer Reachable Information is sent to neighbours' provider edge equipment.
9. device as claimed in claim 7 is characterized in that, described tag computation module specifically is used for:
Calculate according to the identification number of the label cardinal sum side-play amount of first tag block, opposite end customer edge devices customer edge devices correspondence go into label; And/or calculate outgoing label according to the label cardinal sum side-play amount of second tag block, the identification number of customer edge devices.
10. a provider edge equipment is characterized in that, comprising: as the label distribution device in the arbitrary described multi-protocol label switching network of claim 7-9.
11. the label distribution system in the multi-protocol label switching network is characterized in that, comprising: some provider edge equipments as claimed in claim 10 and the plurality of client edge device that is connected with described provider edge equipment.
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| CN108075949B (en) * | 2017-12-13 | 2021-03-23 | 安徽皖通邮电股份有限公司 | Method and equipment for realizing RFC2544 in VPWS environment |
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