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WO2007112645A1 - Procédé et système de mise en oeuvre d'un réseau privé virtuel mobile - Google Patents

Procédé et système de mise en oeuvre d'un réseau privé virtuel mobile Download PDF

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Publication number
WO2007112645A1
WO2007112645A1 PCT/CN2007/000525 CN2007000525W WO2007112645A1 WO 2007112645 A1 WO2007112645 A1 WO 2007112645A1 CN 2007000525 W CN2007000525 W CN 2007000525W WO 2007112645 A1 WO2007112645 A1 WO 2007112645A1
Authority
WO
WIPO (PCT)
Prior art keywords
edge device
provider edge
mobile
user equipment
mobile user
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2007/000525
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English (en)
Chinese (zh)
Inventor
Hongke Zhang
Gang Cheng
Hong Zhu
Hui Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Beijing Jiaotong University
Original Assignee
Huawei Technologies Co Ltd
Beijing Jiaotong University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd, Beijing Jiaotong University filed Critical Huawei Technologies Co Ltd
Publication of WO2007112645A1 publication Critical patent/WO2007112645A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor

Definitions

  • the present invention relates to the field of network and communication technologies, and in particular, to a virtual private network technology, and in particular, to a method and system for implementing a mobile virtual private network. Background technique
  • VPN Virtual Private Network
  • VPNs enable business users to enjoy the same security, priority, manageability, and reliability as the user's private network, while reducing business overhead. As a result, VPNs have become a trend in enterprise networks.
  • Multi-Protocol Label Switching (MPLS) VPN technology is one of the most interesting VPN solutions, including Layer 3 MPLS VPN and Layer 2 MPLS VPN.
  • the Layer 3 MPLS VPN also includes BGP. (Border Gateway Protocol) / MPLS VP and VR (Virtual Router) VPN implementation.
  • MPLS provides a label for each IP packet, and encapsulates the label and IP packet into a new MPLS packet, thereby determining the transmission path and priority of the IP packet; and the MPLS-compatible router will be IP.
  • the MPLS-compatible router will be IP.
  • Multiprotocol Border Gateway Protocol (MBGP) is used to distribute routes in the service provider backbone network.
  • MPLS is used to forward data packets in the backbone network.
  • PE Provider Edge, Provider edge device
  • VRF virtual route forwarding
  • the BGP protocol multi-protocol extended bearer capability is used to forward VPN membership and Reachability information, between VPN users Implement route isolation and advertisement, forward service flows, and allow service providers to use the public network to provide users with a new type of VPN service. While providing all the functions of the original VPN network, it can also provide powerful Quality of Service (QoS) capabilities, featuring high reliability, high security, strong scalability, flexible control strategy, and strong management capabilities. .
  • QoS Quality of Service
  • IPv6, nternet Protocol IPv6, nternet Protocol
  • IPv6 Version 6
  • BGP Border Gateway Protocol
  • the PE maintains the reachability information and forwarding information of each IPv6 VP by establishing a VRF.
  • IPv6 VPN is allowed to have its own private IPv6 address space in IPv6, which means that a given address represents a different system in a different VPN. This is achieved through a new family of addresses, the VPN-IPv6 address family.
  • the VPN-IPv6 address has 24 bytes and consists of an 8-byte route distinguisher (RD, Route Distinguisher) and a 16-byte IPv6 address. If two VPNs use the same IPv6 address prefix (representing different physical systems), the PE translates into a unique VPN-IPv6 address prefix through different RD 4 bar VPNs, thereby ensuring that when two different VPNs use the same address, The address will be loaded into two completely different routes, one for each VPN.
  • the VPN-IPv6 address is always considered to be unique by BGP, and the BGP extended attribute allows BGP to carry routing information and MPLS label information from the extended address family.
  • the BGP/MPLS VPN solution has been extended to allow encapsulation through other tunneling technologies including GRE tunnels, IP-in-IP tunnels, and IPsec tunnels.
  • GRE tunnels GRE tunnels
  • IP-in-IP tunnels IP-in-IP tunnels
  • IPsec tunnels IPsec tunnels
  • IPv4 network will still exist for a long time due to the widespread application of the existing IPv4 network, among which the IPv4 network environment IPv6
  • the network environment is basically the same, except that the IPv4 VPN identification message is different from the IPv6 VPN identification message.
  • the existing BGP/MPLS VPN technology cannot solve the problem of support for its user network mobility. Summary of the invention
  • the embodiments of the present invention provide a method and a system for implementing a mobile virtual private network, so as to solve the defect that the user network mobility support cannot be provided in the prior art.
  • the embodiment of the invention provides a method for implementing a mobile virtual private network, which includes the following steps:
  • the first mobile user equipment advertises routing information to the second provider edge device by using the first provider edge device;
  • the second mobile user equipment obtains the routing information by the second provider edge device, the second provider edge device queries whether the second mobile user equipment has a new label, and if so, the second mobile user equipment belongs to Mobile subnet performs data transmission with the first mobile user equipment through a third provider edge device;
  • the second mobile user equipment performs data transmission with the first mobile user equipment by using the second provider edge device.
  • An embodiment of the present invention provides a system for implementing a mobile virtual private network, including a first provider edge device and a second provider edge device, where the first user edge device and the mobile user device belong to the same virtual private network;
  • the first mobile user equipment sends routing information to the second provider edge device by using the first provider edge device;
  • the second mobile user equipment obtains the routing information through the second provider edge device to communicate with the first user edge device;
  • the mobile user equipment performs data transmission with the first mobile user equipment through the second provider edge device and the first provider edge device.
  • An embodiment of the present invention provides a mobile virtual private network system, including a first provider edge device, a second provider edge device, and a third provider edge device, where the first and second The third provider edge device belongs to the same virtual private network; the system further includes a mobile subnet, the mobile subnet moving to an area controlled by the third provider edge device, according to the received third provider
  • the address prefix information sent by the edge device configures the care-of address, and binds the multi-protocol packet label allocated by the third provider edge device to the care-of address to form a new label.
  • the first provider edge device configured to send a data packet from the first mobile user equipment to the second provider edge device, and match a destination address of the first mobile user equipment from the mobile subnet
  • the data packet is forwarded to the first mobile user equipment
  • the second provider edge device is configured to send a data packet to the third provider edge device according to the new label, and query whether a virtual routing forwarding table matches a destination address of the first mobile user equipment. An entry that forwards the matched data packet and the new label to the first provider edge device;
  • the third provider edge device forwards the data packet to the mobile subnet by querying a virtual routing forwarding table, and determines whether the data packet sent by the mobile subnet matches the destination address of the first mobile user equipment. And forwarding the matched data packet to the first provider edge device, and notifying the new tag, forwarding the unmatched data packet to the second provider edge device.
  • the network structure composed of the MPLS backbone network platform and the user network improves the related virtual private network device and the corresponding data packet transmission process, and proposes an MPLS backbone network and mobile
  • the subnet implements an organically combined BGP/MPLS VPN mobility support solution that addresses the shortcomings of the prior art that cannot support virtual private network mobility.
  • the solution provided by the embodiment of the present invention can apply the subnet mobility function to a conference in a mobile environment.
  • all user equipments in the entire mobile environment constitute a mobile site, that is, a mobile subnet formed inside the company. , in which there will be multiple user devices that need to be in constant contact with other sites of the company for a long time.
  • the solution provided by the embodiment of the present invention does not need to upgrade hardware, and only needs to improve the software of the PE device, and the configuration mode is simple and easy.
  • the structure of the invention conforms to the current popular mobile subnet system, and has good scalability and market promotion.
  • FIG. 2 is a system structural diagram of a mobile virtual private network in an embodiment of the present invention.
  • FIG. 3 is a flow chart of issuing VPN routing information in an embodiment of the present invention.
  • FIG. 4 is a flow chart of data transfer of a specific embodiment of the system of FIG. 2;
  • FIG. 5 is a system structural diagram of a removable virtual private network in another embodiment of the present invention
  • FIG. 6 is a flow chart of forming a care-of address and a new label in the system shown in FIG. 5;
  • FIG. 7 is a flow chart of transmitting data of a fixed user equipment to a mobile subnet in the system shown in FIG. 5.
  • FIG. 8 is a flow chart of transmitting data from a mobile subnet to a fixed user equipment in the system shown in FIG. 5.
  • the flow of the implementation method of the removable virtual private network in the embodiment of the present invention is as shown in FIG. 1 , and includes the following steps:
  • Step S101 The first mobile user equipment sends routing information to the second provider edge device through the first provider edge device.
  • Step S102 The second mobile user equipment obtains the routing information by using the second provider edge device.
  • Step S103 the second provider edge device queries whether the second mobile user equipment has a new label, if yes, indicating that the second mobile user equipment is a mobile subnet, then step s105; otherwise, indicating that the second mobile user equipment is Move the user equipment, then go to step sl04.
  • the forming process of the new label includes: moving the mobile subnet from the second provider edge device control area to the third provider edge device control area, and receiving the agent advertisement information sent by the third provider edge device;
  • the care-of address is configured according to the address prefix information in the proxy advertisement information; the third provider edge device allocates a multi-protocol packet label to the mobile subnet, and binds to the care-of address to form a new label.
  • Step S104 the mobile user equipment passes the second provider edge device and the first Mobile user equipment for data transmission.
  • Step S1Q5 the mobile subnet performs data transmission with the first mobile user equipment by using a third provider edge device.
  • the present invention is also applicable to an IPv4 network environment, except that the IPv4 VPN identification message is different from the IPv6 VPN identification message.
  • Mobile IPv4 the mobile node informs its home address of its care-of address through the registration information carried in the UDP/IP packet.
  • the proxy and the mobile node in Mobile IPv6 uses the Destination Address to notify other nodes of its care-of address, so that the protocol used by the mobile node to obtain the proxy advertisement from the third provider edge device is different, and the process is similar. Therefore, the following is only explained in the IPv6 network environment.
  • BGP/MPLS VPNs generally do not have mobile devices in their MPLS backbone networks, their mobility support is mainly concentrated in the following two situations: First, they are implemented inside BGP/MPLS VPN sites. Mobility support in the IPv6 network environment, that is, the user edge device CE is fixed and the user equipment is mobile. Second, the user equipment and each CE to which each site belongs have mobility support for the IPv network environment, so that the entire CE is connected. The site, the subnet, implements the mobile feature. Thus, embodiments of the present invention are also described in terms of both user device mobility and subnet mobility.
  • the mobility implementation system implemented in the IPv6 network environment in each BGP/MPLS VPN site is shown in Figure 2, including: MPLS backbone network, site 1, site 2, site 3, site 4, user edge devices CE1, CE2.
  • CE3 and CE4 where the mobile user equipment 1 is the first user equipment and the mobile user equipment 2 is the second user equipment;
  • the backbone network includes: the provider edge equipment PE1, PE2, Pl, the provider equipment P2 and P3, PE1 and PE2
  • Site 1 and Site 2 belong to Virtual Private Network A
  • Site 3 and Site 4 belong to Virtual Private Network B;
  • CE2 has Cell a and Cell b, all P, PE and CE
  • the routers are all fixed, and the user equipment 2 in the station can move between the cell a and the cell b.
  • the above network is an IPv6 domain, and all devices support IPv6.
  • the VPN routing information is released.
  • step S101 and step S102 in FIG. 1 further include: CE1 obtains the address information of the user equipment 1 by means of manual configuration or automatic discovery, and then broadcasts its own IPv6 route prefix to the PE1; PE1 learns through the route.
  • the mechanism obtains the routing letter of CE1 PE1 writes the address prefix in the routing information of user equipment 1 to the virtual routing forwarding table; before broadcasting the routing, PE1 allocates the bottom label of the multi-protocol packet label for the routing information.
  • the PE2 obtains the routing information of the user equipment 1 from the PE1 through the multi-protocol border gateway protocol.
  • the broadcast includes: the VPN-IPv6 address prefix of the route, the return address of the PE1 as the BGP next hop, and the MPLS label assigned to the route.
  • the routing destination attribute of the routing VRF configuration that is, the routing output policy
  • PE2 compares the routing information with the virtual routing forwarding table input policy. If it matches, PE2 writes the routing information to the virtual private network IPv6 routing information database VPN- The IPv6.RIB, the user equipment 2 obtains the routing information from the PE2; otherwise, the routing information is discarded.
  • Step S104 as shown in FIG. 4, further includes:
  • the data packet is sent to the CE2, and the CE2 performs the longest matching route query, and then forwards the data packet to the directly connected PE2.
  • the PE2 queries the corresponding VRF based on the sub-interface. If the destination address has a matching entry, the route queries the next hop and the outgoing sub-interface; PE2 allocates the top label and reaches the PE1 through the MPLS backbone network; at PE1, the bottom label is used to query the corresponding CE1, and then the packet is forwarded through the IP layer. Go to CE1 and query the routing table to forward to user equipment 1.
  • the mobility implementation system implemented in the IPv6 network environment in the BGP/MPLS VPN is as shown in Figure 5, including: MPLS backbone network, site 1, site 2, CE1, and CE2, where CE1 is the first edge user.
  • the device and CE2 are second user edge devices.
  • the backbone network includes: PE PE2, PE3, PE4, P1, P2, and P3.
  • PE1, PE2, PE3, and PE4 have virtual routing forwarding table VRPA.
  • Site 1 and station 2 are virtual dedicated.
  • the entire network is an IPv6 domain, in which all devices support IPv6; all P and PE routers are fixed, all user equipments in site 2 and their corresponding CE2 are moved, so that the entire site connected to the CE is moved.
  • the process of publishing the VPN routing information is the same as that of the mobile user equipment.
  • each mobile user equipment in the site 2 does not need to complete the work of separately finding the access router AR and registering with the home agent HA when leaving the local or the handover, and still work as a fixed user equipment.
  • the embodiment selects CE2 as the unified proxy router of mobile station 2, which is equivalent to a mobile router (MR, Mobile Router), to complete a series of work similar to a single ⁇ .
  • ⁇ 2 is selected as ⁇
  • ⁇ 3 is selected as the access router (AR, Access Router).
  • the CE2 After the site 2 moves from the first zone to the second zone, the CE2 receives the agent advertisement information periodically sent by the ⁇ 3.
  • the CE2 completes the router search function by the ICMPv6 router request and the router broadcast message in the neighbor discovery mechanism, and obtains the proxy. Announcement information.
  • Both PE3 and PE2 periodically send route broadcast messages with prefix messages on the local link. Of course, CE2 can also send router request messages. Each router that receives this message should reply with a router broadcast message.
  • CE2 After receiving the proxy advertisement message, CE2 knows that its own site has been moved to the foreign link, and will automatically configure a care-of address based on the new address prefix information. There are two ways to get the care-of address: passive address autoconfiguration and active address autoconfiguration. At this time, PE3 will assign a new MPLS label to CE2 and bind it to its care-of address.
  • CE2 sends a registration request message to its home agent PE2 through PE3.
  • CE2 needs to carry a tag ⁇ R> in the binding update sent to PE2 to indicate the mobile router instead of the ordinary mobile node.
  • the same binding update also includes the mobile network prefix, which can be borrowed from a new mobility header option proposed in NEMO.
  • the details are as follows: After assigning a new label to CE2, PE3 will search for the address of PE2 to which CE2 belongs by querying the corresponding VRFA. PE3 then sends the Binding Update message and the MP-BGP Route Update message (including the tag ⁇ >, the care-of address of CE2 and the new tag, etc.) to PE2.
  • PE2 sends a binding response message to CE2 through PE3. After PE2 receives the binding update message of CE2, PE2 can confirm its binding update, and obtain the care-of address and new label of CE2 and write the part corresponding to CE2 in VRFA, and then use P-BGP.
  • the binding response message is sent to CE2 through the MPLS backbone network. When PE3 receives this response message, it binds the route to CE2 in its VRPA to the new label.
  • CE2 Because it is in the IPv6 network environment, CE2 uses the advertisement method to simultaneously send to PE2. And other sites of VPNA to inform them of the care-of address and new label (if in the IPv4 network environment, CE2 uses the notification mode to simultaneously notify its PE2 and other sites of VPNA of its care-of address and new label).
  • the bulletin includes three types of message: binding update, binding response and binding request, which are placed in an extension header of IPv6 - destination optional header.
  • the binding request is: When the time-to-live field in the binding update message previously received by other sites of the VPNA is to expire, the message is sent to request CE2 to send it a new binding update to obtain the available Care-of address and new label.
  • the user equipment 1 in the site 1 is to advertise the VPN service to the user equipment in the mobile subnet to which the CE2 belongs.
  • the specific process is shown in Figure 7.
  • the mobile user equipment 1 forwards the data packet to the PE2 through the MPLS backbone network.
  • the corresponding VRFA finds that CE2 has gone to the field, so the new label of CE2 is queried in the table.
  • PE3 is found in the same way as the two-layer label.
  • PE3 sends the packet to CE2 by looking up the corresponding VRFA, and CE2 queries the corresponding The routing table sends it to the destination mobile user device.
  • the specific process is as shown in FIG. 8.
  • the mobile user equipment sends the data packet to the CE2 by querying the routing table, and the CE2 queries the routing table to the data.
  • the packet is sent to PE3, and PE3 queries the corresponding VRFA. If the destination address has a matching entry, the route queries its next hop and outbound subinterface. Then 'forward the packet to the destination through the MPLS backbone.
  • CE2 will advertise the new label to PE1 through MP-BGP.
  • PE1 receives this message, it will update the corresponding VRFA. Communication with the mobile user equipment in Site 2 is then sent to the link represented by this tag, which also avoids the triangular routing problem that exists in EMO.
  • CE2 When the station 2 moves back to a zone, CE2 will receive the agent advertisement message sent by the PE2, thereby judging that it has returned to the home link, and the CE2 will cancel the current care-of address and the new label to the PE2, so that It works like a fixed node.
  • the station 2 moves from the second area to the other three areas, and at this time, the user equipment 1 is sending a data packet to the PE3, then the time is A mechanism called "timeout retransmission" through the TCP layer, that is, as long as it is within the range of a ⁇ time ⁇ b (a, b can be artificially defined), it is considered to be a packet loss rather than a recognition.
  • the transfer processing of the packet is abandoned for the network to fail. And in the process, all in the second zone with
  • the node information that CE2 has established communication will be recorded in its forwarding table.
  • CE2 will send a message to these nodes to update its care-of address and label, so PE1 will update the corresponding content in VRFA after getting this message, and then
  • the packet of the user equipment 1 is sent to the PE4, so that the mobile user equipment receives the data packet, and the problem of packet loss or manual retransmission may be avoided due to handover.
  • the CE2 should immediately send a binding update message to the user equipment 1 and all the CNs in contact with the second area.
  • the CE2 sends a binding update to the PE2. Priority is given to ensuring existing services, and then considering the established service strategy for new services.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention porte sur un procédé de mise en oeuvre d'un réseau privé virtuel mobile. Selon le procédé de l'invention, un premier dispositif utilisateur mobile envoie des informations à un deuxième dispositif périphérique fournisseur via un premier dispositif périphérique fournisseur (s101); un deuxième dispositif utilisateur mobile obtient les informations de routage via le deuxième dispositif périphérique fournisseur (s102); un sous-réseau mobile, auquel appartient le deuxième dispositif utilisateur mobile communique des données au premier dispositif utilisateur mobile via un troisième dispositif périphérique fournisseur qui est interrogé (s103); ou lorsqu'il n'y a pas de nouvelle étiquette, le deuxième dispositif utilisateur mobile communique des données au premier dispositif utilisateur mobile via le deuxième dispositif périphérique fournisseur (s104). Ainsi, un système de réseau privé virtuel peut être mis en oeuvre. Une solution qui consiste à améliorer la mobilité BGP/MLPS VPN, où le réseau à conduction osseuse MPLS et le sous-réseau mobile sont combinés permet de résoudre le problème d'insuffisance de mobilité de réseau privé virtuel de l'état de la technique antérieur.
PCT/CN2007/000525 2006-04-05 2007-02-14 Procédé et système de mise en oeuvre d'un réseau privé virtuel mobile Ceased WO2007112645A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2006100671444A CN101052207B (zh) 2006-04-05 2006-04-05 一种可移动虚拟专用网的实现方法及系统
CN200610067144.4 2006-04-05

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WO2007112645A1 true WO2007112645A1 (fr) 2007-10-11

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