CN103856984A - Method and device for large-flow R-P port data association on basis of mark transmitting back - Google Patents
Method and device for large-flow R-P port data association on basis of mark transmitting back Download PDFInfo
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Abstract
The invention relates to a device for large-flow R-P port data association on the basis of mark transmitting back. The device comprises a front exchange unit, middle analysis units and a rear exchange unit; in an A10/A11 network, the front exchange unit forwards data of A10 to the middle analysis units according to a gre key field, and data of A11 is forwarded to the middle analysis units according to an external IP address; the middle analysis units further analyze input flow, and part of flow which does not belong to the analysis units is marked and transmitted back to the front exchange unit; the analysis units finally will conduct decapsulation and reduction on user data, mark an IMSI number and the gre_key on a data package mac field, and forward the IMSI number and the gre_key to the rear exchange unit. According to the device, by means of the data package marking and transmitting back function, different user data loads are balanced to different analysis units according to the gre_key, and a method and the device for large-flow R-P port data association on the basis of mark transmitting back are achieved.
Description
Technical field
The present invention relates to R-P interface high-speed network flow monitoring field in CDMA 2000 networks, especially a kind of characteristic of utilizing packet mark passback between crosspoint and resolution unit, by associated with user data signaling data method and device thereof.
Background technology
PCF(Packet Control Function, Packet Control Function) and PDSN(Packet Data Serving Node, packet data serving node) be most important two nodes in CDMA2000 core network, PCF end is up link toward the link of PDSN end communication, and PDSN end is down link toward the link of PCF end communication.Both are interconnected by R-P interface (being called again A10/A11 interface).A11 is signaling interface, is responsible for establishment of connection, safeguards and deletes.A10 is data-interface, and the packet of transmission is GRE(Generic Routing Encapsulation, Generic Routing Encapsulation) PPP fragment data after encapsulation, and have the out of order situation of bag and exist.Data after the decapsulation of A10 data have unpacked data and packed data, also need to enter decompression flow process for packed data.
The extensive use of 3G mobile terminal is convenient for life has brought, and has proposed challenge also to traditional flow detection and control technology.The association of R-P interface data and regression analysis, have important meaning in fields such as traffic identification, business statistics, flow control, attack analyses.
In the transaction module of publication number CN 103024819 A " the 3G (Third Generation) Moblie core network data shunt method based on user terminal IP ", provide a kind of method that all data messages evenly can be diverted to the back-end analysis equipment corresponding with this IP address by User IP address.Because all 3G core network link messages all can serial pass through the modules in data front end data processing and exchanging unit, therefore each module may become the bottle diameter of performance, so can not adapt to large capaciated flow network (20Gbps-40Gbps) disposition.
In the transaction module of publication number CN 102497652 A " a kind of code division multiple access R-P interface massive dataflow load-balancing method and device ", a kind of method that 10G crosspoint sends data balancing according to IP regional ascription 10G disposable plates has been proposed, the method granularity of this data balancing is thicker, region flow when there were significant differences load balancing effect will inevitably have a greatly reduced quality, and, in the time that same region flow exceedes more greatly the disposal ability of 10G treatment facility, have user data loss.
Summary of the invention
Problem to be solved by this invention is, under the main trend that R-P interface flow increases sharply in CDMA2000 network, a kind of device of large flow (20G-40G) the R-P interface data association based on mark passback is provided, and this device can meet the joint demand of signaling and data under large flow.The method based on mark passback that this device adopts, can be with thinner granularity by resolution unit in the middle of balanced with A11 signaling A10 data being distributed to, and the load balancing effect in solution existing technologies is not good, the technical problem of disposing underaction.
For solving the problems of the technologies described above, the present invention proposes a kind of device of the large flow R-P interface data association based on mark passback, this device is in the A10/A11 of high speed flow network, utilize front end crosspoint that the data of A10 are forwarded to middle resolution unit according to gre_key field, resolution unit in the middle of the data of A11 are forwarded to according to outer IP address.Middle resolution unit can further be resolved the flow entering, and the flow that part does not belong to this resolution unit can return to front end crosspoint by mark.Resolution unit is finally understood decapsulation reduction user data, and international mobile subscriber identity (IMSI:International Mobile Subscriber Identification Number) number is marked to packet MAC(Medium Access Control with gre_key) field, be transmitted to rear end crosspoint.The data of this device output are original user data, meet the processing requirements of user data traffic being made to further analysis.
The device of above-mentioned a kind of large flow R-P interface data association based on mark passback, this device comprises:
1. front end crosspoint
Front end crosspoint only carries out two layers, three layer protocols, VLAN(Virtual Local Area Network) parsing of constant offset in field and data.
The packet that enters front end crosspoint is divided into two classes: primary sources bag is original A10/A11 packet, secondary sources bag is to resolve unit resolves through centre to cross the packet (wherein the span minimum of n is 1, the number of resolution unit in the middle of being to the maximum) with Mn mark.
After front end crosspoint enters original A10/A11 packet, in bag content, put T mark, then by A10, A11 data retransmission is to middle resolution unit.
Front end crosspoint is received after the packet with Mn mark, and the VLAN field in resolution data can forward bag to corresponding middle resolution unit according to analysis result.
2. resolution unit in the middle of
The processing procedure of middle resolution unit is divided into two stages.First stage is mainly carried out the parsing of gre_key, and judging this packet according to the value of gre_key is to be processed by resolution unit in the middle of which.Second stage carries out the shunting of user data, and the reduction of user's initial data is finally carried out in decapsulation.
In the middle of entering, the A10/A11 data of resolution unit are divided into two classes, respectively can be corresponding with two of a processing procedure stage.
The first kind is the A10/A11 packet with T mark, the data of only processing through front end crosspoint.These class data are mainly carried out at the first stage of middle resolution unit, after this phase process, can determine that this packet carries out the parsing of next stage by resolution unit in the middle of which, then puts Mn mark in packet content according to the content of the gre_key parsing.If this packet is by chance to be resolved by current middle resolution unit, this packet is directly delivered to a next stage.If packet is to be resolved by other middle resolution unit, packet is passed back to front end crosspoint.
Secondary sources bag is the data with Mn mark, and the processing of such packet is mainly carried out at second stage.User data after second stage is parsed is put U mark, and the MAC of user data is upper with No. IMSI that identifies.Have real net environment, when equipment accesses at the beginning unidentified go out the data of No. IMSI, will on MAC, make other specific markers to distinguish.
3. rear end crosspoint
Rear end crosspoint is deployed in rear, and the data that enter are the data with U mark, and the MAC Address field that rear end crosspoint can resolution data bag, according to the value Hash forwarding data bag of MAC Address.
The present invention also proposes a kind of method of the large flow R-P interface data association based on mark passback, and the method comprises:
Need data to be processed are carried out to mark, comprise initial data is added to VLAN field, and VLAN field and MAC field are modified to reach the not differentiation of isolabeling.The original A10/A11 packet that enters front end crosspoint is put I mark.In the middle of front end crosspoint enters, the packet of resolution unit is put T mark.
The preliminary treatment of front end crosspoint improves the precision that is forwarded to correct middle resolution unit.For original A10 packet, parse constant offset content in packet, according to 32 figure places of constant offset content (i.e. gre_key field in major part bag), package forward is arrived to middle resolution unit, forwarding rule can deliver in middle resolution unit according to certain hash algorithm.For original A11 packet, front end crosspoint according to outer IP to resolution unit in the middle of being hashing onto.
Utilize the method for passback, guarantee that all packets are by parsing cell processing in the middle of correct.Middle resolution unit identifies gre_key field according to GRE protocol specification.According to the value of gre_key field, determine that this packet is by which resolves cell processing in the middle of, and packet is put to Mn mark.The packet that middle resolution unit returns to front end crosspoint is put Mn mark.
Front end crosspoint is received after the packet with Mn mark, can directly bag be forwarded to corresponding middle resolution unit according to tag content (resolving the value of vlan_id in VLAN field).
The shunting of user data, decapsulation, finally carries out the reduction of user's initial data.And the user data MAC field after reduction is put to U mark and is transmitted to rear end crosspoint.
The present invention has the following advantages:
The process of whole R-P data correlation in CDMA2000 network is divided into the processing of front end crosspoint, middle cell processing and the rear end crosspoint processing three phases of resolving by the present invention, utilize the function of packet marking passback, realized a kind of method and apparatus that according to gre_key, different user data load balancing is arrived to different resolution unit.This invention can realize the association of many R-P interface data under large flow, after association process completes, the MAC(medium access control of packet) field can mark on user's international mobile subscriber identity, same user's data will be gone out from the port repeat of fixing rear end crosspoint.This invention is resolved cell processing by A10 data and A11 signaling to be forwarded to centre compared with fine granularity, has avoided the bottleneck problem of middle resolution unit protocol analysis.In the time that operator redeploys PCF or PDSN IP, deal with more flexibly, can better meet practical application request.
The method to packet marking of utilization, distinguishes each stage of packet, and makes front end crosspoint distinguish the flow of different user according to gre_key field.The data that finally gre_key is identical are by resolving cell processing in the middle of same, granularity is less, and in the time that network environment changes, autgmentability is strong.
Utilize the method for passback, guarantee that all A11/A10 packets of same stream are all processed by correct same middle resolution unit, improve the integrality of end user data.
The flexible configuration of middle resolution unit number, has solved the performance bottleneck of A10 data reduction.On the R-P interface converging at large flow (20G-40G), can realize the association of data.
Accompanying drawing explanation
Fig. 1 is the equipment structure chart that the present invention is based on the large flow R-P interface data association of mark passback, and middle resolution unit is extendible.
Fig. 2 is the method flow diagram that the present invention is based on the large flow R-P interface data association of mark passback.
Fig. 3 is the flow chart that middle resolution unit is carried out data processing.
Fig. 4 is the filling content graph of the VLAN field in mark.
Fig. 5 is the difference of VLAN field in different mark corresponding data bag.
Fig. 6 be No. IMSI with the signature of gre_key at packet.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.
Fig. 1 is the structure drawing of device of the described large flow R-P interface data association based on mark passback of this invention.This device is at CDMA2000 core network domain R-P interface, and by front end crosspoint, middle resolution unit and rear end crosspoint form.Label 101 is front end crosspoints, and label 102 is middle resolution unit, and label 103 is rear end crosspoints.
As shown in the direction of arrow in Fig. 1, the data flow of front end crosspoint and middle resolution unit is two-way.The data flow of middle resolution unit and rear end crosspoint is unidirectional.
P[I] represent the raw data packets after R-P interface converges, P[T] represent after front end crosspoint is processed, with the packet of T mark, P[Mn] represent after the middle resolution unit first stage processes, with the packet of Mn mark, n represents object resolution unit, P[U] represent after middle resolution unit second stage is processed, with the packet of U mark.
In the case of the flow access of 20Gbps-40Gbps, can adopt front resolution unit in four to be connected with front and back end crosspoint.
Fig. 2 is the overview flow chart of the method for this invention.The concrete steps of this overall procedure are as follows:
In the middle of label 208 represents, resolution unit is received the data that front end dividing cell proceeds to.
In the middle of representing, label 209 whether resolves unit judges data with Mn mark.For the flow with T mark of resolution unit in the middle of entering, entering label is step process shown in 210.For the flow with Mn mark of resolution unit in the middle of entering, entering label is step process shown in 212.
In the middle of label 210 represents, resolution unit are received after the data that front end crosspoint proceeds to, and according to GRE protocol analysis A10 data acquisition gre_key field, also A11 Data Analysis are gone out to gre_key and IMSI field simultaneously.Put Mn mark according to the value of gre_key.
Fig. 3 is that middle resolution unit is received with after T mark and the packet with Mn mark, and the different handling process of taking, is the further segmentation to middle resolution unit flow process.Concrete steps are as follows:
Label 301 represents the processing procedure of ip IP fragmentation and reassembly.
Resolution unit number=(key1+key2) % resolution unit number
Wherein gre_key is got 8 bits by key1 at every turn, and order is divided into four parts, this four part be added obtain and.
Wherein gre_key is got 8 bits by key2 at every turn, and order is divided into four parts, the result that this four parts XOR obtains.
The data that in the middle of label 304 represents, the non-current resolution unit of resolution unit passback will be resolved.
In the middle of label 305 represents, resolution unit continues to resolve these data.
Fig. 4 and Fig. 5 have illustrated respectively the difference of the vlan_id field of the mark of the VLAN field contents that adds in packet and different phase.The method that all R-P flows that produce from front end crosspoint are marked is mostly changed vlan_id and is realized after packet adds VLAN field, and vlan_id is for mark and the different middle mark of resolving cell processing in different stages.
Packet vlan_id with T mark is set to 2.
The vlan_id value of middle resolution unit is counted 0x65 from 101(16 system).In the middle of having four, in the situation of resolution unit, the vlan_id of four middle resolution unit is respectively 101(16 system and counts 0x65), 102(16 system is counted 0x66), 103(16 system is counted 0x67), 104(16 system is counted 0x68).
Fig. 6 has illustrated that middle resolution unit completes after the data correlation of R-P interface, and IMSI or gre_key are filled out to the structure chart in packet MAC field.In figure, with the data format of U mark, be from the beginning the high 4 of imsi successively, 40,44 of imsi centres, 40, No. imsi low 4,40,32 gre_key.
Claims (8)
1. a device for the large flow R-P interface data association based on mark passback, is characterized in that, comprising:
Front end crosspoint, middle resolution unit and rear end crosspoint; In A10/A11 network, resolution unit front end crosspoint is forwarded to the data of A10 according to gre_key field in the middle of, resolution unit in the middle of the data of A11 are forwarded to according to outer IP address; Middle resolution unit can further be resolved the flow entering, and the flow that part does not belong to this resolution unit can return to front end crosspoint by mark; Resolution unit is finally understood decapsulation reduction user data, and international mobile subscriber identity is marked to packet mac field with gre_key No. IMSI, is transmitted to rear end crosspoint.
2. the device of a kind of large flow R-P interface data association based on mark passback according to claim 1, is characterized in that, described front end crosspoint carries out two layers, three layer protocols, the parsing of constant offset in VLAN field and data.
3. the device of a kind of large flow R-P interface data association based on mark passback according to claim 1 and 2, it is characterized in that, the packet that enters front end crosspoint is divided into two classes: primary sources bag is original A10/A11 packet, secondary sources bag is to resolve unit resolves through centre to cross the packet (wherein the span minimum of n is 1, the number of resolution unit in the middle of being to the maximum) with Mn mark; After front end crosspoint enters original A10/A11 packet, in bag content, put T mark, then by A10, A11 data retransmission is to middle resolution unit; Front end crosspoint is received after the packet with Mn mark, and the VLAN field in resolution data forwards bag to corresponding middle resolution unit according to analysis result.
4. the device of a kind of large flow R-P interface data association based on mark passback according to claim 1, is characterized in that, the described middle cell processing process of resolving is divided into two stages; First stage is carried out the parsing of gre_key, and judging this packet according to the value of gre_key is to be processed by resolution unit in the middle of which; Second stage carries out the shunting of user data, and the reduction of user's initial data is finally carried out in decapsulation.
5. according to the device of a kind of large flow R-P interface data association based on mark passback described in claim 1 or 4, it is characterized in that, in the middle of entering, the A10/A11 data of resolution unit are divided into two classes, respectively can be corresponding with two of a processing procedure stage; The first kind is the A10/A11 packet with T mark, the data of only processing through front end crosspoint; These class data are mainly carried out at the first stage of middle resolution unit, after this phase process, can determine that this packet carries out the parsing of next stage by resolution unit in the middle of which, then puts Mn mark in packet content according to the content of the gre_key parsing; If this packet is by chance to be resolved by current middle resolution unit, this packet is directly delivered to a next stage; If packet is to be resolved by other middle resolution unit, packet is passed back to front end crosspoint; Secondary sources bag is the data with Mn mark, and the processing of such packet is carried out at second stage; User data after second stage is parsed is put U mark, and the MAC of user data is upper with No. IMSI that identifies.
6. the device of a kind of large flow R-P interface data association based on mark passback according to claim 5, it is characterized in that, have real net environment, when equipment accesses at the beginning unidentified go out the data of No. IMSI, will on MAC, make other specific markers to distinguish.
7. the device of a kind of large flow R-P interface data association based on mark passback according to claim 1, it is characterized in that, described rear end crosspoint is deployed in rear, the data that enter are the data with U mark, the MAC Address field of rear end crosspoint meeting resolution data bag, according to the value Hash forwarding data bag of MAC Address.
8. a method for the large flow R-P interface data association based on mark passback, the method comprises:
Need data to be processed are carried out to mark, comprise initial data is added to VLAN field, and VLAN field and MAC field are modified to reach the not differentiation of isolabeling; The original A10/A11 packet that enters front end crosspoint is put I mark; In the middle of front end crosspoint enters, the packet of resolution unit is put T mark
;the preliminary treatment of front end crosspoint improves the precision that is forwarded to correct middle resolution unit; For original A10 packet, parse constant offset content in packet, according to 32 figure places of constant offset content, adopt described hash algorithm as forwarding rule, package forward is arrived to middle resolution unit; For original A11 packet, front end crosspoint to resolution unit in the middle of being hashing onto, utilizes the method for passback according to outer IP, guarantees that all packets are by parsing cell processing in the middle of correct; Middle resolution unit identifies gre_key field according to GRE protocol specification; According to the value of gre_key field, determine that this packet is by which resolves cell processing in the middle of, and packet is put to Mn mark
;the packet that middle resolution unit returns to front end crosspoint is put Mn mark; Front end crosspoint is received after the packet with Mn mark, directly bag is forwarded to corresponding middle resolution unit according to tag content; Middle resolution unit is carried out the shunting of user data, and decapsulation, finally carries out the reduction of user's initial data, and the user data MAC field after reduction is put to U mark is transmitted to rear end crosspoint.
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