CN100393062C - Method for core network access to multi-protocol sign exchange virtual special network - Google Patents
Method for core network access to multi-protocol sign exchange virtual special network Download PDFInfo
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Abstract
The present invention discloses method for connecting a core network to a multi-protocol mark exchange virtual special network. An external port of GGSN is provided with a VLAN logic sub interface, and a PE device at the opposite end is also provided with a VLAN logic sub interface so that the IP and ARP of both parties are communicated; then, a mapping relationship between the ARN and the VLAN is arranged on the GGSN, and a mapping relationship between the VLAN and the VPN is also established on the PE device; in a control layer, a PDP context is established according to a mapping relationship between the APN, the VLAN and the VPN; in a user layer, the core network is connected with an MPLS VPN network so as to interact with the MPLS VPN network according to the established PDP context and the corresponding VLAN information. By using VLAN technology, a mapping relationship between the APN, the VLAN and the MPLS VPN, and users are connected to the corresponding MPLS VPN through the mapping relationship.
Description
Technical field
The present invention relates to a kind of MPLS VPN method for network access, relate in particular to a kind of method that core net is inserted MPLS VPN network.
Background technology
Current enterprise network VPN (Virtual Private Network, Virtual Private Network) technology is in the ascendant, becomes the focus that industry is paid close attention to day by day.MPLS (Multiprotocol Label Switching wherein, the multi protocol label exchange) VPN is widely used in logical partitioning of enterprise network resource and safety isolation, the enterprise network of a physics is divided into a plurality of independently " logical network ", is the technology of at present more satisfactory realization Resource Allocation in Networks.
MPLS VPN is a kind of IP VPN based on the MPLS technology, it is the IP virtual private network network that utilizes in conjunction with the label switched realization of traditional route technology, it can provide each IP packet a mark, it and IP data envelope are loaded on new MPLS packet, determine the transmission path and the priority of IP packet thus, and can before the IP packet is transmitted by respective paths, only read the packet header mark of this MPLS packet with the router of MPLS compatibility, need not go to read the information such as IP address bit in each IP packet again, so the exchange forwarding speed of packet is accelerated greatly.
The assembly that MPLS VPN framework comprises: P equipment (operator's core router), PE (ProviderEdge, Provider Edge) equipment, CE (Custom Edge, client edge) equipment, vpn service management system, wherein most critical is PE equipment.
With Fig. 1 is example, be MPLS VPN technologies topology schematic diagram, with the VPN1 data instance, its concrete repeating process is as follows: after a certain CE equipment of districts and cities is issued the entry PE router with the VPN1 data, pe router is searched the VRF table (virtual routing table) of this sub-interface correspondence, obtains VPN1 label, initial outer layer label and to the output interface of outlet PE router from the VRF table.After the VPN1 grouped data is stamped two-layer label, just be transmitted to the outlet PE router by output interface.The outlet PE router is searched the MPLS routing table and is obtained corresponding output interface according to the VPN1 label, by this interface the VPN1 grouped data is sent to correct CE equipment after ejecting the VPN1 label, thereby has realized whole data forwarding process.When outlet PE router and entry PE router are same router, pe router will directly be transmitted to the purpose ce router without any processing to the VPN1 grouped data of receiving.
The MPLS technology is a kind of emerging technology, is intended to solve the many problems that exist in the current group retransmission technique.And therefore a MPLS VPN technologies direction of VPN development from now on especially merges 3G technology and MPLS VPN and seems particularly important.
GGSN (GGSN) is the gateway node of 3G core net, is responsible for the mobile subscriber is linked into the VPN network of external packet data net, Internet or enterprise.The APN that GGSN contracts according to the user (APN) selects the own network that will visit, if certain APN connection is a VPN network, the mobile subscriber of this APN that then contracted will visit corresponding VPN by GGSN, also comprise MPLS VPN certainly.
The connection of setting up between portable terminal and the GGSN access point (AP) is a PDP (packet data protocol) context, makes travelling carriage to setting up a logical path between the GGSN by this process.
The mobile subscriber wants the access external data network, must initiate pdp context activation, and travelling carriage receives its IP address in the PDP Context that activates.
In 3G network, each APN of GGSN is the assigned address configuration mode separately, the protocol procedures of its address configuration, generally at first initiate the message of " activating the PDP Context request " to SGSN (GPRS serving GPRS support node) by portable terminal, and in message, relevant parameter is passed to SGSN, after SGSN receives request then, send " the establishment PDP Context request information; after GGSN receives request; for the portable terminal distribution interface identifies and create a link local address; then relevant information is encapsulated in the response message of " creating the PDP Context request "; send back to SGSN; after SGSN receives response message that has above-mentioned parameter to GGSN, relevant information being encapsulated in " activating the PDP Context request " receives in the message, send back to portable terminal, portable terminal obtains disposing accordingly after the address information, and interface identifier parsed, send " route requests " message according to configuration then and give GGSN, GGSN sends one " advertising of route " to portable terminal after executing " activating the PDP Context request " operation.Through above process, the IP packet that is sent by portable terminal directly is forwarded to GGSN by the node in the 3G network, is routed to objective network by GGSN again.
It generally is to insert by traditional IP routing mode that present GGSN is linked into external network, the up-downgoing of GGSN gateway device is transmitted and is all realized by route, all APN are in identical address space, if realize VPN, substantially can only adopt general tunnel encapsulation mode, and to be linked into complicated MPLS VPN network, more difficult in the realization.MPLS VPN network internal has adopted the distinctive tag switching of MPLS and traditional IP technology to have bigger difference, therefore is difficult to directly APN and MPLS label be set up mapping relations on GGSN.
Therefore, can propose a kind of simple method, the GGSN in the 3G core net is inserted MPLS VPN network, become problem demanding prompt solution in the industry.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method with core net accessing multi-protocol sign exchange virtual special network, and the GGSN in the 3G core net is inserted MPLS VPN network.
The invention provides a kind of method, comprise the steps: core net accessing multi-protocol sign exchange virtual special network
Configuration VLAN logical subinterface also disposes the VLAN logical subinterface on the PE of opposite end equipment on the GGSN external interface, makes both sides' IP and ARP intercommunication;
On GGSN, set up the mapping relations of APN and VLAN, simultaneously in the mapping relations of setting up on the PE equipment between VLAN and the VPN;
On the control aspect,, set up PDP Context according to the mapping relations of APN, VLAN and VPN;
On user level,,, core net is inserted MPLS VPN network with the MPLSVPN network interaction according to PDP Context of creating and corresponding vlan information.
The present invention sets up in GGSN among APN, the VLAN VPN by vlan technology, has solved the problem that mobile technology and MPLS VPN technologies merge on the GGSN equipment.With the mapping relations of MPLS VPN, the user is linked into corresponding M PLS VPN network by this mapping relations.
Description of drawings
Fig. 1 is a MPLS VPN technologies topology schematic diagram;
Fig. 2 is a virtual local area net topology schematic diagram;
Fig. 3 carries out the intercommunication schematic diagram for utilizing GGSN of the present invention by VLAN logical subinterface and MPLS VPN network;
Fig. 4 utilizes a kind of networking schematic diagram of the present invention with core net accessing multi-protocol sign exchange virtual special network;
Fig. 5 is the embodiments of the invention flow chart.
Embodiment
Because the user of having carried a plurality of MPLS VPN on the physical link of GGSN and external network, therefore must introduce a kind of technology makes a distinction the user of different VPN on identical physical link, therefore introducing vlan technology realizes that this access way is very feasible, (VLAN ID) distinguishes different MPLS VPN by VLAN ID, on GGSN, set up simultaneously a kind of mapping of APN and VLAN, so just can realize that the user flexibility that will belong to APN is linked in the MPLS VPN network.
VLAN (Virtual Local Area Network) is a VLAN, thus be a kind of by with the apparatus logic in the local area network (LAN) rather than physics be divided into the emerging technology that the network segment is one by one realized the virtual work group.Though the equipment that VLAN connected from the different network segments, can carry out direct communication each other, as being in the same network segment, the local area network (LAN) layout of comparing traditional, vlan technology is more flexible.As shown in Figure 2, be virtual local area net topology schematic diagram.
When transmitting the data of different VLAN on trunk line, general use is the frame flag method at present.When Frame transmitted on trunk line, switch was labelled in the information of frame head and is specified corresponding VLAN ID.After frame passes through relaying, remove mark and simultaneously frame is exchanged to corresponding vlan port.
Therefore, if can on GGSN, use vlan technology, needs are linked into the user data of VPN, stamping the VLAN frame head when outlet sends, when receiving, need peel off the VLAN frame head simultaneously, and find correct PDP (Packet Data Protocol, packet data protocol) context, realization access process that just can be complete according to VLAN ID.
As shown in Figure 3, for utilizing GGSN of the present invention to carry out the intercommunication schematic diagram by VLAN logical subinterface and MPLSVPN network.MPLS VPN network is made up of PE (Provider Edge) equipment at edge and P (operator's core router) equipment of core exchange, GGSN will be linked into the MPLSVpN network, at first must carry out intercommunication with PE equipment, on PE equipment, can distinguish different VPN, and then carry out the quick forwarding of label in the inside, some VPN space according to VRF (virtual routing table).In concrete enforcement, GGSN must give the VPN information band PE equipment of opposite end, and this transmits by the VLAN logical links.After 3G subscription was linked into GGSN, GGSN just arrived VLAN according to mapping relationship searching, by the VLAN that finds user's message is transmitted to PE equipment like this, finally generated VRF by PE, carried out label forwarding, to have access to the VPN network of enterprise.
As shown in Figure 4, for utilizing a kind of networking schematic diagram of the present invention with core net accessing multi-protocol sign exchange virtual special network, MPLS VPN network is made up of PE (Provider Edge) equipment at edge and P (operator's core router) equipment of core exchange, GGSN will be linked into MPLS VPN network, at first must carry out intercommunication with PE equipment, on PE equipment, can distinguish different VPN, and then carry out the quick forwarding of label in the inside, some VPN space according to VRF (virtual routing table).In concrete enforcement, GGSN must give the VPN information band PE equipment of opposite end, and this transmits by the VLAN logical links.After 3G subscription was linked into GGSN, GGSN just arrived VLAN according to mapping relationship searching, by the VLAN that finds user's message is transmitted to PE equipment like this, finally generated VRF by PE, carried out label forwarding, to have access to the VPN network of enterprise.
As shown in Figure 5, be the embodiments of the invention flow chart, at first configuration VLAN logical subinterface on the GGSN external interface also disposes the VLAN logical subinterface on the PE of opposite end equipment, makes both sides' IP and ARP intercommunication (step 501); On GGSN, set up the mapping relations of APN and VLAN then, simultaneously in the mapping relations of setting up on the PE equipment between VLAN and the VPN, to generate virtual routing table (step 502); Create PDP Context, the address space (step 503) of associated user with the mapping relations of setting up; The flow process of judging user data is upstream data or downlink data (step 504); If upstream data, then send to outside multi protocol label VPN (virtual private network) (step 505) according to the mapping relations packaging V LAN message of setting up, external network finds corresponding VPN label forwarding (step 506) according to VLAN mapping relations and virtual routing table through multi protocol label switching protocol; If downlink data, then find the private address space (step 507) of respective user according to the corresponding relation of VLAN label, and according to the correct tunnel (step 508) of user profile encapsulation.
The VLAN logical subinterface of on the GGSN external interface, creating, each logical subinterface all has a VLAN ID, each sub-interface and outside MPLS network interface form corresponding relation, and IP route that assurance and external network can normally carry out and ARP (address resolution protocol) resolve.
Behind the corresponding relation of setting up APN, VLAN and MPLS VPN network, the APN that can contract according to the user, dispose corresponding VLAN logical subinterface, can form mapping relations by APN ID and VLAN ID between the two, by VLAN ID and then the corresponding MPLS VPN that goes up the outside.
On the control aspect, the information that can contract according to the user and the mapping relations of VLAN, VPN are set up PDP Context.On user level, then according to the PDP Context of creating, corresponding vlan information and MPLS VPN network interaction, core net correctly is linked into MPLS VPN network the most at last.
For up mobile user data, the APN information searching that GGSN contracts according to the user arrives the external network connected mode of this APN correspondence, and GGSN determines the external network that this APN user will visit by this connected mode.
For connected mode is common direct-connected mode, and GGSN searches routing table according to the user uplink data message and transmits, and the user is linked in the external network.For down user data, GGSN finds corresponding PDP Context according to user's message, is further processed by the user's information data of preserving in the PDP Context, finally sends to SGSN (GPRS serving GPRS support node).
And be to insert MPLS VPN network for connected mode, then utilize the present invention, need divide logical subinterface to the outgoing interface of GGSN, carry the user data of some MPLS VPN on the just corresponding VLAN logical links of each logical subinterface, every VLAN logical links.
If certain APN will insert MPLS VPN network, then GGSN sets up the mapping relations of VPN and VLAN.
In user's activation, GGSN must create PDP Context according to mapping relations, needs the associated user address space at the establishment context.Detailed process can comprise the steps:
(1) mobile phone need be visited the packet field network business, at first initiates activation process, and handle claim tag access point is approximately brought up;
(2) activate request and arrive GGSN, GGSN judges the access way of this cellphone subscriber's APN configuration;
(3) do you judge that access way is to be linked into multi-protocol label switching network? if this mode, then carry out 64 hash (Hash) computing together with the mobile phone address with to Virtual Private Network label that should access point, create PDP Context;
(4) after mobile phone activates successfully, initiate the upstream data service of visit packet switch domain service;
(5) GGSN initiates to activate success response to mobile phone, and the chain of command flow process finishes.
For user's uplink data messages, GGSN finds corresponding VLAN logical subinterface according to the mapping of APN ID and VLAN ID, and vlan information is encapsulated into the user's message front, sends to the MPLS network by the VLAN logical subinterface.Specifically, can comprise the steps:
(1) the uplink business data bag in mobile phone initiation packet territory, packet arrives GGSN;
(2), then take out the virtual local area network tags of configuration if the access point of this mobile phone has disposed the accessing multi-protocol label exchange network;
(3) issue the provider edge router that links to each other with GGSN with next hop information in upstream data bag front encapsulation virtual local area network tags, and according to the interface message of this access point configuration;
(4) after provider edge router is received uplink message, according to the virtual local area network tags of the message that receives, the label that the operation multi protocol label switching protocol obtains transmitting;
(5) edge router is issued core P router according to forwarding label with uplink message, and the P router is directly according to the Virtual Private Network of label forwarding to the visit of mobile phone needs;
(6) up user's surface current journey finishes.
For the downlink message that comes from MPLS VPN network, GGSN can not only find user's PDP Context according to the information of message, because for VPN user, address space can be overlapping, possibly can't locate which PDP Context by message information merely, therefore must add that here VLAN ID carries out index simultaneously, just can find the right user PDP Context, and then again message is carried out subsequent treatment, finally issue SGSN.Specifically, can comprise the steps:
When (1) network side was initiated downstream data traffic to mobile phone, by the label of multiprotocol label agreement, downlink message arrived GGSN;
(2) the descending message of receiving of GGSN, is the destination address of at first judging message the mobile phone address? if mobile phone address, and be the message that has virtual local area network tags, then remove the label of VLAN, and bring user surface processing board message and virtual local area network tags;
(3) on user surface processing board, mobile phone address and virtual local area network tags are carried out 64 hash computing together, there PDP Context according to the hash index search?
(4) if there is PDP Context, then according to the information encapsulation GPRS Tunnel Protocol head that writes down in the PDP Context that finds, and issue SGSN, issue mobile phone again by SGSN; If can not find PDP Context, dropping packets then;
(5) downlink user surface current journey finishes.
Above-mentioned several sections has been described the basic procedure that the mobile subscriber inserts MPLS VPN network, and these several essential parts are forward-backward correlations.The user will insert MPLS VPN network, general steps and common access are similar, mobile subscriber for common access external network, main flow process is exactly at first to create PDP Context, transmit user's face message according to routing relation then, and for the user that will be linked into MPLS VPN network, owing to there is VPN, therefore on activation process and user's surface current journey, there is certain difference, at first, GGSN will insert MPLS VPN network, be to be undertaken, therefore must divide different VLAN logical subinterface, the corresponding VPN of each logical subinterface the GGSN interface of going out by the mode of VLAN, certainly, also can be the user data that a plurality of logical subinterface are shared same VPN; Secondly, necessary related vlan information in the time of user's activation and establishment PDP Context, for VPN user, maximum characteristics are exactly that the address can be overlapping, therefore must create in some VLAN the inside, can guarantee the uniqueness of user's PDP Context like this.At last, be exactly forwarding plane, by setting up the mapping relations between APN, VLAN and the MPLS VPN, according to this mapping relations at user's face, just can when the up-downgoing data forwarding, find correct PDP Context, realize that user data inserts MPLS VPN network smoothly.
3G core net of the present invention is exactly to set up user's VPN and the mapping relations between the VLAN by the core concept that vlan technology inserts the method for MPLS VPN network, and this mapping relations and user's chain of command flow process and user's surface current journey combined, give the MPLS network with the information band of VLAN simultaneously, edge device by the MPLS network finds corresponding VPN according to vlan information, to generate Label Forwarding Information Base separately, cooperate jointly by GGSN and MPLS edge device, finish user's access.
GGSN creates contextual the time, not only will be according to station address information, TFT (Chinese name), but also to create according to vlan information, and guarantee in the inside, same VPN space, the uniqueness of PDP Context makes each VPN user's data can correctly find contextual information separately to handle.
GGSN manages a lot of APN, and certain APN or a plurality of APN belong to some VPN, need VPN and VLAN be associated by mapping, just can VPN of unique identification by vlan information.
After the last establishment of the GGSN VLAN logical subinterface, must accomplish the proper communication of GGSN and MPLS network to the protocol processes of IP and ARP.
Adopt the present invention, can realize that GGSN inserts the function of MPLS VPN on the basis of existing technology more easily, for the VPN networking of core net provides more complete commercial solution.
Claims (7)
1. the method with core net accessing multi-protocol sign exchange virtual special network is characterized in that comprising the steps:
Configuring virtual LAN logical subinterface on the GGSN external interface, also configuring virtual LAN logical subinterface on the provider edge equipment of opposite end makes both sides' IP and address resolution protocol intercommunication;
On GGSN, set up the mapping relations of APN and VLAN, simultaneously in the mapping relations of setting up on the provider edge equipment between VLAN and the Virtual Private Network;
On the control aspect,, set up block data protocol context according to the mapping relations of APN, VLAN and Virtual Private Network;
On user level, according to block data protocol context of creating and corresponding information of virtual local area network, with the multi-protocol sign exchange virtual special network network interaction, with core net accessing multi-protocol sign exchange virtual special network network.
2. the method for claim 1, it is characterized in that described VLAN logical subinterface has VLAN ID, each sub-interface and outside Virtual Private Network network interface formation corresponding relation can normally carry out IP route and address resolution protocol with external network and resolve.
3. the method for claim 1, it is characterized in that described configuring virtual LAN logical subinterface is to dispose corresponding VLAN logical subinterface according to the APN APN that the user contracts, form mapping relations by APN sign and VLAN ID, by the Virtual Private Network of VLAN ID and then corresponding external network.
4. the method for claim 1 is characterized in that described establishment block data protocol context, is to create in some VLANs space, with the uniqueness of the block data protocol context that guarantees the user.
5. the method for claim 1 is characterized in that describedly on the control aspect, according to the mapping relations of APN, VLAN and Virtual Private Network, sets up block data protocol context, comprises the steps:
(1) mobile phone need be visited the packet field network business, at first initiates activation process, and handle claim tag access point is approximately brought up;
(2) activate request and arrive GGSN, GGSN is judged the access way of this cellphone subscriber's APN configuration;
(3) judge whether access way is to be linked into multi-protocol label switching network, if this mode, then carry out 64 Hash operation together, create block data protocol context with the mobile phone address with to Virtual Private Network label that should access point;
(4) after mobile phone activates successfully, initiate the upstream data service of visit packet switch domain service;
(5) GGSN initiates to activate success response to mobile phone, and the chain of command flow process finishes.
6. the method for claim 1, it is characterized in that described on user level, according to block data protocol context of creating and corresponding information of virtual local area network, with the multi-protocol sign exchange virtual special network network interaction, with core net accessing multi-protocol sign exchange virtual special network network, for upstream data service, comprise the steps:
(1) the uplink business data bag in mobile phone initiation packet territory, packet arrives GGSN;
(2), then take out the virtual local area network tags of configuration if the access point of this mobile phone has disposed the accessing multi-protocol label exchange network;
(3) issue the provider edge router that links to each other with GGSN with next hop information in upstream data bag front encapsulation virtual local area network tags, and according to the interface message of this access point configuration;
(4) after provider edge router is received uplink message, according to the virtual local area network tags of the message that receives, the label that the operation multi protocol label switching protocol obtains transmitting;
(5) edge router is issued core router according to forwarding label with uplink message, and core router is directly according to the Virtual Private Network of label forwarding to the visit of mobile phone needs;
(6) up user's surface current journey finishes.
7. the method for claim 1, it is characterized in that described on user level, according to block data protocol context of creating and corresponding information of virtual local area network, with the multi-protocol sign exchange virtual special network network interaction, with core net accessing multi-protocol sign exchange virtual special network network, for downstream data traffic, comprise the steps:
When (1) network side was initiated downstream data traffic to mobile phone, by the label of multiprotocol label agreement, downlink message arrived GGSN;
(2) the descending message of receiving of GGSN, whether the destination address of at first judging message is the mobile phone address, if mobile phone address, and be the message that has virtual local area network tags, then remove the label of VLAN, and bring user surface processing board message and virtual local area network tags;
(3) on user surface processing board, mobile phone address and virtual local area network tags are carried out 64 Hash operation together, search whether there is block data protocol context according to hash index;
(4) if there is block data protocol context, then according to the information encapsulation GPRS Tunnel Protocol head that writes down in the block data protocol context that finds, and issue the GPRS serving GPRS support node, issue mobile phone again by SGSN; If can not find block data protocol context, dropping packets then;
(5) downlink user surface current journey finishes.
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| JP4816572B2 (en) * | 2007-05-30 | 2011-11-16 | 富士ゼロックス株式会社 | Virtual network connection system and apparatus |
| CN101087236B (en) * | 2007-08-09 | 2010-06-02 | 杭州华三通信技术有限公司 | VPN access method and device |
| CN101599901B (en) * | 2009-07-15 | 2011-06-08 | 杭州华三通信技术有限公司 | Method, system and gateway for remotely accessing MPLS VPN |
| CN102025800B (en) | 2010-12-30 | 2013-04-24 | 华为技术有限公司 | IP address allocation method and device |
| CN102891790B (en) * | 2012-09-21 | 2016-03-02 | 中国电信股份有限公司 | The VPN virtual method of the privately owned cloud of a kind of accesses virtual and system |
| US9419892B2 (en) * | 2013-09-30 | 2016-08-16 | Juniper Networks, Inc. | Methods and apparatus for implementing connectivity between edge devices via a switch fabric |
| CN107342943B (en) * | 2017-06-15 | 2019-09-06 | 烽火通信科技股份有限公司 | A method of the channel SCN is established under SPTN system Overlay scene |
| CN109743726B (en) * | 2018-12-05 | 2021-11-23 | 江苏鑫软图无线技术股份有限公司 | Method for sharing static terminal in LTE system roaming scene |
| CN111294270B (en) * | 2018-12-07 | 2021-12-03 | 华为技术有限公司 | Method, device, equipment and system for accessing data center |
| CN111786909B (en) * | 2020-05-19 | 2022-04-29 | 深圳震有科技股份有限公司 | Method for updating protocol state of VRRP interface, switch and storage medium |
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