WO2009129715A1 - 转发报文的方法、家乡代理设备、路由设备和系统 - Google Patents

转发报文的方法、家乡代理设备、路由设备和系统 Download PDF

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Publication number
WO2009129715A1
WO2009129715A1 PCT/CN2009/071146 CN2009071146W WO2009129715A1 WO 2009129715 A1 WO2009129715 A1 WO 2009129715A1 CN 2009071146 W CN2009071146 W CN 2009071146W WO 2009129715 A1 WO2009129715 A1 WO 2009129715A1
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Prior art keywords
routing device
address
packet
network
new location
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PCT/CN2009/071146
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English (en)
French (fr)
Inventor
蒋胜
徐小虎
夏忠其
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华为技术有限公司
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Publication of WO2009129715A1 publication Critical patent/WO2009129715A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2212/00—Encapsulation of packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for forwarding a message, a home agent device, a routing device, and a system.
  • ISP Internet Service Provider
  • BGP Border Gateway Protocol
  • Border Gateway Protocol Border Gateway Protocol
  • the concept of multiple address domains has been introduced in the prior art to solve the problem of route scalability.
  • the entire global network consists of multiple networks with separate address spaces. These address space independent networks are called LD (Locator Domain).
  • the LD internally uses IPv4, IPv6, or other protocol address space.
  • IPv4, IPv6, or other protocol address space One LD uses only one address space.
  • Each LD has a globally unique address, the LD ID.
  • the LDs are connected by a BR (Border Router).
  • the host of the network uses its own LD ID and local address (LD internal address) to form a globally unique address identifier, which is used for packet forwarding and routing. When communicating in the same LD, data packets are forwarded hop by hop directly using the internal address of the LD.
  • the multi-address space network architecture cannot support the mobility of the network. When the mobile network moves away from the home location to the outside, how to ensure that the host in the mobile network is not recognized as new. The connection, but the normal communication according to the original location identification, does not give a specific implementation. Summary of the invention
  • the embodiment of the present invention provides a method for forwarding a message, a home agent device, a mobile router, and a system.
  • the technical solution is as follows:
  • the embodiment of the present invention provides a method for forwarding a packet, which is applied to a network architecture including multiple address domains, and the method includes:
  • the home agent corresponding to the routing device receives the new message sent by the routing device.
  • a location identifier information where the home agent receives the packet, and the destination address of the packet is the location identifier information of the terminal in the network, and encapsulates the packet with all or part of the content of the new location identifier information. Then sent to the routing device.
  • the embodiment of the present invention provides a home agent device, which is applied to a network architecture including multiple address domains, and the device includes:
  • An identifier information receiving module configured to: when a network accessing the network framework by the routing device leaves the home access point, and accesses the new location by using the routing device, receiving a new location sent by the routing device Identification information;
  • a packet receiving module configured to receive a packet whose destination address is location identifier information of the terminal in the network
  • a forwarding module configured to use all or part of the content encapsulation information of the new location identifier information received by the identifier information receiving module After receiving the packet, the packet is sent to the routing device.
  • the embodiment of the present invention provides a routing device, which is applied to a network architecture that includes multiple address domains, and after the network connected to the network architecture through the routing device leaves the home access point,
  • the routing device is used as a new access point of the network, and the routing device includes:
  • a processing module configured to obtain address information of the routing device in an address domain corresponding to the new access point, where the address domain has identification information, and is further configured to generate new location identifier information according to the identifier information and the address information ;
  • a sending module configured to send the new location identifier information obtained by the processing module to the home agent device corresponding to the routing device.
  • the embodiment of the present invention further provides a system for forwarding a packet, which is applied to a network architecture including multiple address domains, where the system includes:
  • a routing device configured to: after leaving the home access point by using the routing device to access a network in the network architecture, As a new access point of the network, acquiring address information of the network in an address domain corresponding to the new access point, where the address domain has identification information, and is further configured to generate, according to the identifier information and the address information, New location identification information, and transmitting the new location identification information;
  • the home agent device is configured to receive new location identifier information sent by the routing device, and when the packet is received, and the destination address of the packet is location identifier information of the terminal in the network, the new location is used. All or part of the content of the identification information encapsulates the message and sends the message to the routing device.
  • the embodiment of the present invention obtains the location identification information of the address domain corresponding to the routing device in the new location, and performs corresponding forwarding according to the location identifier information, thereby implementing support for network mobility in the multi-address space network architecture, thereby enabling new access.
  • the terminal in the network of the location can complete normal communication with the terminal outside the network without modifying any configuration.
  • FIG. 1 is a schematic diagram of a multi-address space network architecture according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a network accessing a home address field through a home location of the home through the MR according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of another access location of the home address domain accessed by the MR after the network is moved according to the embodiment of the present invention
  • FIG. 4 is a schematic diagram of accessing a foreign address domain through a MR after the network is moved according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for forwarding a message according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of another method for forwarding a message according to an embodiment of the present invention.
  • FIG. 7 is a structural diagram of a home agent device according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of a routing device according to an embodiment of the present invention.
  • FIG. 9 is a structural diagram of a system for forwarding a message according to an embodiment of the present invention. detailed description
  • the multi-address space network architecture in the embodiment of the present invention includes multiple network LDs with independent address spaces.
  • Each LD can adopt IPv4, IPv6, or other protocol address space.
  • multi-address space network architecture Including LD1, LD2, LD3, and LD4, where LD2 uses an IPv6 address space, and the remaining LDs use an IPv4 address space.
  • the network accesses the network architecture through the routing device, and then leaves the home access point and
  • the first scenario is that after the network leaves the home access point, the routing device accesses other locations in the home address domain (this address domain).
  • the two scenarios are that after the network leaves the home access point, the network device accesses the foreign address domain.
  • the routing device in the embodiment of the present invention includes a mobile router MR and a fixed router whose topology point changes.
  • the fixed router whose topology point changes refers to that the physical location of the router does not change, but accesses the network topology.
  • the connection has changed. For example, referring to FIG.
  • the mobile network accesses the home address domain LD1 through the MR1; see FIG. 3, after the mobile network moves, accesses the other location of the home address domain LD1 through the MR1, that is, the first scenario described above; see FIG. After the mobile network leaves the home address domain LD1, it accesses the foreign address domain LD3 through MR1, that is, the second scenario described above.
  • An embodiment of the present invention provides a method for forwarding a packet, which is applied to a network architecture that includes multiple address domains, and specifically includes: leaving a home access point when the network accessing the network architecture through the routing device leaves the home access point When the routing device accesses the new location, the HA (Home Agent) corresponding to the routing device receives the new location identification information sent by the routing device; and the HA receives the packet whose destination address is the location identification information of the terminal in the network. And encapsulating the packet with all or part of the content of the new location identifier information, and sending the packet to the routing device.
  • the HA corresponding to the routing device in the embodiment of the present invention refers to the HA that is responsible for receiving the registration information sent by the routing device when accessing the network home access point in the network architecture by using the routing device, the registration information.
  • FIG. 5 is a flowchart of a method for forwarding a packet according to an embodiment of the present invention.
  • a routing device is used as a mobile router, and the method includes:
  • the mobile router MR accesses the network in the network architecture including multiple address domains, leaves the home access point, and accesses the new location through the MR, the MR acquires in the address domain corresponding to the new location. Address information in the address field.
  • the internal terminal uses the location identifier assigned by the home address domain, and the location identifier is diffused to the network mapping system and each communication peer.
  • the location identifier of the terminal is determined by the home address.
  • the identifier of the domain is composed of the IP address of the terminal, and is fixed. That is, the terminal does not sense the movement of the network, and still uses the location identifier information of the home address domain.
  • the location identification of the terminal 2 in Figures 2, 3 and 4 is always LD1 ID + 1.0.0.1, and the location identifier remains unchanged even if the network MN in which the terminal 2 is located moves.
  • the new location of the above network through the MR access may be other locations in the home address domain, or may be a foreign address domain.
  • the address information in the address field corresponding to the new location acquired by the MR refers to the temporary address information allocated to the MR by the address field corresponding to the new location after the network moves to the new location, and the temporary address information is allocated according to the space of the address domain.
  • New addresses there are many principles for allocation, including but not limited to using DHCP (Dynamic Host Configuration Protocol, Dynamic Master) Machine Configuration Protocol) The protocol assigns an address, and the assigned new address is unique within that address field.
  • the new location accessed by the network through the MR is specifically a foreign address domain.
  • the IPv4 address information of MR1 in the home address domain LD1 is 211.0.0.2, and the address information is allocated according to the address space IPv4 of the home address domain LD1; in Figure 4, after the network MN moves from LD1 to LD3
  • the temporary address information allocated by LD3 to MR1 is 2101:: 1, and the address is allocated according to the address space IPv6 of LD3.
  • the MR generates new location identifier information according to the identifier information of the address domain corresponding to the new location and the obtained address information.
  • the generated new location identifier information may be referred to as a foreign location identifier, which is used as a global identifier for the MR after the network is moved.
  • the location identifier of the MR in the home address field may be referred to as the home location identifier, the home location identifier remains unchanged, and the MR location identifier is variable, and the address field corresponding to the new location accessed by the MR is connected.
  • the location allocation For a terminal inside the network, there is no need to modify any configuration, nor need to perceive the movement of the network, no matter where it is, use its fixed location identifier.
  • MR1 when MR1 is in the home address domain LD1, its home location identifier is composed of the identification information of the home address domain LD1 and the address information of the MR1 home address domain, S ⁇ LD1 ID+211.0.0.2; see FIG.
  • the foreign location identifier is LD1 ID+211.0.0.9; see Figure 4, when MR1 is in the foreign address domain LD3, its foreign location identifier is assigned to MR1 by the identification information of the foreign address domain LD3 and LD3.
  • the temporary address information consists of LD3 ID+2101::1.
  • the MR sends the generated new location identification information to the HA corresponding to the MR in the home address domain.
  • the MR needs to register the range of the location identifier of the network managed by itself to the HA of the corresponding home address domain, that is,
  • IPv6 The prefix in IPv6 or the subnet segment in IPv4.
  • the location identifier of the subnet managed in the home address domain has been registered with the corresponding HA, such as 1.0.0.0/24.
  • the terminal inside the network passes the MR. To communicate, you do not need to go through the HA.
  • the HA When the MR moves to another location in the foreign address domain or the home address domain, the HA is re-registered with the location identification range of the subnet managed by the new location, such as 2101 :: 1, at this time, the terminal inside the network passes the The HA performs normal communication, that is, other devices in the multi-address space network architecture do not know the new location of the MR after the network moves, and need to be located by the HA, and the HA can know the new location of the MR according to the registration information sent by the MR. And according to the new location identification information in the registration information, the related traffic is forwarded to the MR, and the communication to the terminal in the network is completed by the MR.
  • the HA receives the new location identifier information sent by the MR, and saves the new location identifier information. At this time, a forwarding tunnel between the MR and the HA is formed.
  • 505 When the HA receives the packet and the destination address of the packet is the location identifier information of the terminal in the network, the HA encapsulates the packet with all or part of the content of the saved new location identifier information of the MR, and encapsulates the packet. The subsequent packet is sent to the MR. In this embodiment, the HA encapsulates the packet with the new location identifier information, that is, encapsulates the packet with the entire content of the new location identifier information.
  • the MR After receiving the encapsulated packet, the MR decapsulates the packet, removes the identifier information related to the new location, and removes the new location identifier information in the packet, and then forwards the decapsulated packet. Give the terminal.
  • the HA encapsulates all the traffic destined for the terminal in the network and forwards the traffic to the MR through the forwarding tunnel between the MR and the HA.
  • the MR After receiving the data, the MR performs corresponding decapsulation and routes according to the hometown. The method is sent to the terminal that still uses the home location identifier.
  • the network traffic of the terminal to the external terminal in the network is also encapsulated by the MR, and is forwarded to the HA through the tunnel, and then decapsulated by the HA, and then forwarded to the destination terminal according to the normal routing manner.
  • MR1 when a network is in the home network LD1, MR1 is accessed using the access location identifier (LD1 ID+211.0.0.2), and the terminals inside the network use the network segment 1.0.0.0/24.
  • terminal 2 has a globally unique location identifier (LD1 ID+1.0.0.1), and HA uses location identifier (LD1 ID+211.0.0.6).
  • the MR registers its managed network segment information with the HA (may contain multiple network segments).
  • the terminal location identifier of the network is unchanged, and the address of the network segment (LD1 ID+1.0.0.0/24) is still used, and MR1 obtains a temporary address information 2101:1.
  • MR1 updates its own access location identification information to the HA of the home address domain to form a forwarding tunnel between MR1 and its corresponding HA.
  • the HA encapsulates all network traffic destined for the network segment (LD1 ID+1.0.0.0/24) according to the saved network segment information managed by MR1 and the new location identification information of the MR, for example, all sent to the terminal 2
  • the packet is forwarded to the temporary access location of MR1 through the tunnel, and then decapsulated by MR1, and sent to the terminal still using the home location identifier according to the routing method of the hometown.
  • the external terminal may record the new location identification information of the MR, and in the subsequent communication process, according to the new location identifier Information is communicated directly to terminals within the network without having to be relayed through the HA, thereby optimizing routing.
  • the above method obtains the new location identification information of the MR, and performs corresponding forwarding according to the new location identification information, thereby realizing the support of the network in the multi-address space network architecture, so that the terminal in the network accessing the new location does not need to be modified. Any configuration that enables normal communication with terminals outside the network.
  • FIG. 6 is a flowchart of another method for forwarding a packet according to an embodiment of the present invention. This embodiment is still described by using a routing device as a mobile router. The method specifically includes:
  • the mobile router MR accesses the network in the network architecture including multiple address domains, leaves the home access point, and accesses other locations in the home address domain through the MR, the MR obtains the temporary in the home address domain.
  • Address information For example, in Figure 2, the IPv4 address information of MR1 in the home address domain LD1 is 211.0.0.2, and the address information is allocated according to the address space IPv4 of the home address domain LD1; in Figure 3, when the network moves to a new location in LD1 At the time, the temporary address information allocated by LD1 to MR1 is 211.0.0.9, and the address is still allocated according to the address space IPv4 of LD1.
  • the MR generates new location identification information according to the identification information of the home address domain and the temporary address information acquired above.
  • the MR sends the generated new location identification information to the HA corresponding to the MR in the home address domain.
  • the HA receives the new location identification information sent by the MR, and saves the new location identification information. At this time, a forwarding tunnel between the MR and the HA is formed.
  • the HA When the HA receives the packet and the destination address of the packet is the location identifier information of the terminal in the network, the HA encapsulates the packet with the temporary address information in the new location identifier information of the saved MR, that is, the new packet is used. Part of the location identification information encapsulates the packet, and sends the encapsulated packet to the MR.
  • the MR After receiving the encapsulated packet, the MR decapsulates the packet, removes the temporary address information, and forwards the decapsulated packet to the terminal.
  • the external terminal may record the new location identification information of the MR, and in the subsequent communication process, according to the new location identifier Information is communicated directly to terminals within the network without having to be relayed through the HA, thereby optimizing routing.
  • the method shown in FIG. 6 obtains the new location identification information of the MR and performs corresponding forwarding according to part of the content of the new location identification information, thereby realizing the support of the network movement in the multi-address space network architecture, thereby enabling access to the new location.
  • the terminal in the network can complete normal communication with the terminal outside the network without modifying any configuration.
  • an embodiment of the present invention further provides a home agent device HA, which is applied to a network architecture including multiple address domains, and specifically includes:
  • the identifier information receiving module 701 is configured to: when the network accessing the home network access point through the routing device accesses the home access point, and access the new location by using the routing device, receive the new location identifier information sent by the routing device. ;
  • the message receiving module 702 is configured to receive a message whose destination address is the location identifier information of the terminal in the network, and the forwarding module 703 is configured to encapsulate all or part of the content of the new location identifier information received by the identifier information receiving module 701.
  • the packet received by the packet receiving module 702 is sent to the routing device.
  • the forwarding module 703 specifically includes:
  • the home address field forwarding unit is configured to encapsulate the packet received by the packet receiving module 702 by using the address information in the new location identifier information received by the identifier information receiving module 701, and send the encapsulated packet to the routing device.
  • the forwarding module 703 specifically includes:
  • the foreign address field forwarding unit is configured to encapsulate the packet received by the packet receiving module 702 with the new location identifier information received by the identifier information receiving module 701, and send the encapsulated packet to the routing device.
  • the above-mentioned home agent device obtains the new location identification information of the routing device, and performs corresponding forwarding according to the new location identification information, thereby realizing the support of the network movement in the multi-address space network architecture, thereby enabling access to the new location within the network.
  • the terminal can complete normal communication with terminals outside the network without modifying any configuration.
  • an embodiment of the present invention further provides a routing device, which is applied to a network architecture that includes multiple address domains. After the network accessing the network architecture through the routing device leaves the home access point, the route is used. As a new access point of the network, the device specifically includes:
  • the processing module 801 is configured to obtain address information of the routing device in an address domain corresponding to the new access point, where the address domain has identification information, and is further configured to generate new location identifier information according to the identifier information and the address information;
  • the sending module 802 is configured to send the new location identification information obtained by the processing module 801 to the home agent device corresponding to the routing device.
  • routing device further includes:
  • a forwarding module configured to receive a packet with a destination address sent by the home agent device and a location identifier of the terminal in the network, decapsulating the packet, and removing the location identifier associated with the new access point in the packet The information is forwarded to the terminal by the decapsulated packet according to the location identifier information of the terminal in the decapsulated packet.
  • the routing device in this embodiment may be specifically a mobile router or a fixed router whose topology point changes.
  • the fixed router originally accesses the service provider's network in the home address domain.
  • the connection is changed to access the network communication operator's network, although it does not move, The location of the network topology is changed, so the technical solution in the embodiment of the present invention is still applicable.
  • the routing device sends the new location identification information to the home agent device, so that the home agent device can forward the related traffic according to the new location identification information, thereby realizing the support of the network movement in the multi-address space network architecture, thereby enabling the new access.
  • the terminal in the network of the location can complete normal communication with the terminal outside the network without modifying any configuration.
  • the embodiment of the present invention further provides a system for forwarding a packet, which is applied to a network architecture including multiple address domains, and specifically includes:
  • the routing device 901 is configured to: after the network accessing the home network access point through the routing device, leave the home access point as a new access point of the mobile network, and obtain the routing device in the address domain corresponding to the new access point.
  • Address information, the address field has identification information; and is further configured to generate new location identification information according to the identification information and the address information, and send new location identification information;
  • the home agent device HA 902 is configured to receive the new location identifier information sent by the routing device 901. When receiving the packet whose destination address is the location identifier information of the terminal in the network, use the new location identifier information to use all or part of the content. The received packet is encapsulated and sent to the routing device 901.
  • the routing device 901 decapsulates the packet, and removes the location identifier information related to the new location in the packet, according to the destination terminal in the decapsulated packet.
  • the location identifier information is forwarded to the terminal by the decapsulated packet.
  • the system sends the new location identification information to the HA through the routing device, and the HA performs corresponding forwarding according to the new location identification information, thereby implementing the support of the network in the multi-address space network architecture, thereby enabling the terminal in the network to access the new location.
  • Normal communication with terminals outside the network can be done without modifying any configuration.
  • each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the storage medium mentioned above may be a hard disk of an MR or HA, a cache, a read only memory or an optical disk or the like.

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Description

转发报文的方法、 家乡代理设备、 路由设备和系统 本申请要求于 2008年 4月 23 日提交中国专利局、 申请号为 200810094244.5、 发明名称 为 "转发报文的方法、 家乡代理设备、 路由设备和系统" 的中国专利申请的优先权， 其全部 内容通过引用结合在本申请中。
说
技术领域
本发明涉及通讯技术领域， 特别涉及一种转发报文的方法、 家乡代理设备、 路由设备和 系统。
书
背景技术
随着互联网技术的发展， 互联网路由和编址系统正面临严重的扩展性问题。 当 ISP (Internet Service Provider, 互联网服务提供商） 把自己的 （子） 网络连接到互联网上时， 会 把该子网络在互联网上的位置（一个或多个子网前缀）， 通过 BGP (Border Gateway Protocol, 边界网关协议）通告给相邻的 BGP路由器， 然后通过 "邻居通告"的方式， 逐步扩散到整个 互联网。 新连接的出现， 使互联网中的 BGP路由器增添了计算和包处理的工作。 越来越多的 新连接， 使互联网上的流量不断增加， 造成了 BGP表的增长以及经过 BGP路由器的流量不 断增加， 导致了 ISP成本的增加， 间接地也增加了所有互联网用户的使用成本。 而且， 由于 IP地址本身既具有标识地址 Locator又具有标识身份 Identity的职能，从而限制了编址路由的 扩展性。
现有技术中引入了多地址域的概念， 来解决路由扩展性的问题。 整个全球网络由多个地 址空间独立的网络组成。 这些地址空间独立的网络称为 LD (Locator Domain, 地址域）。 LD 内部采用 IPv4、 IPv6或者其他协议地址空间， 一个 LD只采用一种地址空间。 每个 LD都有 一个全球唯一的编址， 即 LD ID。 LD之间通过 BR (Border Router, 边界路由器） 连接。 网 络的主机采用自身的 LD ID和本地地址 （LD内部地址） 共同构成全球唯一的地址标识， 该 标识用于包的转发和路由。 在同一 LD 内进行通信时， 数据报文直接采用 LD 内部的地址进 行逐跳转发。在不同 LD之间进行通信时， 数据报文按照目的 LD逐跳寻找下一跳 BR进行转 发， 直到到达目的 LD。 在对现有技术进行分析后， 发明人发现： 多地址空间网络架构， 无法支持网络的移动性， 当移动网络离开家乡位置移动到外地时，如何保证该移动网络内的主机不被识别为新的连接， 而是按照原有的位置标识进行正常的通信， 没有给出具体的实现。 发明内容
为了实现多地址空间网络构架中支持网络的移动性， 本发明实施例提供了一种转发报文 的方法、 家乡代理设备、 移动路由器和系统。 所述技术方案如下：
一方面， 本发明实施例提供了一种转发报文的方法， 应用于包含多个地址域的网络构架， 所述方法包括：
当通过路由设备接入到所述网络构架中的网络离开家乡接入点， 且通过所述路由设备接 入到新位置时， 所述路由设备对应的家乡代理接收所述路由设备发来的新位置标识信息； 所述家乡代理接收到报文，且所述报文的目的地址为所述网络中终端的位置标识信息时， 用所述新位置标识信息的全部或部分内容封装所述报文后发送给所述路由设备。
另一方面，本发明实施例提供了一种家乡代理设备， 应用于包含多个地址域的网络构架， 所述设备包括：
标识信息接收模块，用于当通过路由设备接入到所述网络构架中的网络离开家乡接入点， 且通过所述路由设备接入到新位置时， 接收所述路由设备发来的新位置标识信息；
报文接收模块， 用于接收目的地址为所述网络中终端的位置标识信息的报文； 转发模块， 用于用所述标识信息接收模块收到的新位置标识信息的全部或部分内容封装 所述报文接收模块收到的报文后， 发送给所述路由设备。
再一方面， 本发明实施例提供了一种路由设备， 应用于包含多个地址域的网络构架， 当 通过所述路由设备接入到所述网络构架中的网络离开家乡接入点后， 所述路由设备作为所述 网络的新接入点， 所述路由设备包括：
处理模块， 用于获取所述路由设备在所述新接入点对应的地址域内的地址信息， 所述地 址域具有标识信息； 还用于根据所述标识信息与地址信息， 生成新位置标识信息；
发送模块， 用于发送所述处理模块得到的新位置标识信息给所述路由设备对应的家乡代 理设备。
另外， 本发明实施例还提供了一种转发报文的系统， 应用于包含多个地址域的网络构架， 所述系统包括：
路由设备， 用于当通过所述路由设备接入到所述网络构架中的网络离开家乡接入点后， 作为所述网络的新接入点， 获取所述网络在所述新接入点对应的地址域内的地址信息， 所述 地址域具有标识信息； 还用于根据所述标识信息与地址信息， 生成新位置标识信息， 并发送 所述新位置标识信息；
家乡代理设备， 用于接收所述路由设备发来的新位置标识信息， 当接收到报文， 且所述 报文的目的地址为所述网络中终端的位置标识信息时， 用所述新位置标识信息的全部或部分 内容封装所述报文后发送给所述路由设备。
本发明实施例通过获取路由设备在新位置对应的地址域的位置标识信息， 并根据该位置 标识信息进行相应的转发， 实现了在多地址空间网络构架中支持网络的移动， 从而使接入新 位置的网络内的终端不用修改任何配置， 能够完成与该网络外部的终端的正常通信。 附图说明
图 1是本发明实施例提供的多地址空间网络构架示意图；
图 2是本发明实施例提供的网络通过 MR在家乡位置接入家乡地址域示意图； 图 3是本发明实施例提供的网络移动后通过 MR接入到家乡地址域的其他接入位置的示 意图；
图 4是本发明实施例提供的网络移动后通过 MR接入外地地址域示意图；
图 5是本发明实施例提供的一种转发报文的方法流程图；
图 6是本发明实施例提供的另一种转发报文的方法流程图；
图 7是本发明实施例提供的家乡代理设备结构图；
图 8是本发明实施例提供的路由设备结构图；
图 9是本发明实施例提供的转发报文的系统结构图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚， 下面将结合附图对本发明实施方式作进 一步地详细描述。
本发明实施例中的多地址空间网络构架， 包括多个地址空间独立的网络 LD， 每个 LD可 以采用 IPv4、 IPv6或其它协议地址空间， 其中的一个场景可以参见图 1， 多地址空间网络构 架包括 LD1、 LD2、 LD3和 LD4， 其中， LD2采用 IPv6地址空间， 而其余 LD采用 IPv4地 址空间。
本发明实施例中， 网络通过路由设备接入到上述网络构架中， 然后离开家乡接入点并且 通过该路由设备接入新位置， 有两种应用场景， 第一种场景是该网络离开家乡接入点后， 通 过该路由设备接入到家乡地址域 （本地址域） 内的其它位置； 第二种场景是该网络离开家乡 接入点后， 通过该路由设备接入到外地地址域。 本发明实施例中的路由设备包括移动路由器 MR和拓扑结构点发生变化的固定路由器， 其中， 拓扑结构点发生变化的固定路由器是指该 路由器的物理位置没有发生变化， 而是接入网络拓扑的连线发生了变化。 例如， 参见图 2， 移动网络通过 MR1接入家乡地址域 LD1 ; 参见图 3， 该移动网络移动后， 通过 MR1接入到 家乡地址域 LD1的其它位置，即上述第一种场景；参见图 4，该移动网络离开家乡地址域 LD1 后， 通过 MR1接入到外地地址域 LD3， 即上述第二种场景。
本发明实施例提供了一种转发报文的方法， 应用于包含多个地址域的网络构架， 具体包 括： 当通过路由设备接入到该网络构架中的网络离开家乡接入点， 且通过该路由设备接入到 新位置时， 该路由设备对应的 HA (Home Agent, 家乡代理） 接收该路由设备发来的新位置 标识信息； HA接收目的地址为上述网络中终端的位置标识信息的报文， 用该新位置标识信 息的全部或部分内容封装所述报文后发送给该路由设备。 本发明实施例中与路由设备对应的 HA是指当通过该路由设备接入到上述网络构架中的网络在家乡接入点时， 负责接收该路由 设备发来的注册信息的 HA， 该注册信息为路由设备在家乡地址域内所管理子网的位置标识 范围。
参见图 5， 为本发明实施例提供的一种转发报文的方法流程图， 本实施例以路由设备为 移动路由器为例进行说明， 该方法具体包括：
501： 当通过移动路由器 MR接入到包含多个地址域的网络构架中的网络， 离开家乡接入 点， 且通过 MR接入到新位置时， 在新位置对应的地址域内， MR获取在该地址域内的地址 信息。
通过 MR接入家乡地址域时， 内部的终端都使用家乡地址域分配的位置标识， 并向网络 映射系统和各通信对端扩散这些位置标识， 在本实施例中， 终端的位置标识由家乡地址域的 标识与终端的 IP地址组成， 且是固定不变的， 即终端没有感知到所在网络的移动， 仍然使用 家乡地址域的位置标识信息。 如图 2、 3和 4中的终端 2的位置标识始终为 LD1 ID+1.0.0.1 , 即使终端 2所在的网络 MN发生移动， 该位置标识仍然不变。
上述网络通过 MR接入的新位置可以是家乡地址域的其它位置， 也可以是外地地址域。 MR获取的在新位置对应的地址域内的地址信息是指该网络移动到新位置后， 新位置对应的 地址域给 MR分配的临时地址信息， 该临时地址信息是按照该地址域的空间分配的新地址， 分配的原则有多种， 包括但不限于使用 DHCP (Dynamic Host Configuration Protocol, 动态主 机配置协议） 协议分配地址， 且分配的新地址在该地址域内是唯一的。 在本实施例中， 网络 通过 MR接入的新位置具体为外地地址域。 例如， 图 2中 MR1在家乡地址域 LD1内的 IPv4 地址信息为 211.0.0.2， 该地址信息是按照家乡地址域 LD1的地址空间 IPv4进行分配的； 图 4 中当网络 MN从 LD1移动到 LD3后， LD3给 MR1分配的临时地址信息为 2101 :: 1， 该地址 是按照 LD3的地址空间 IPv6进行分配的。
502： MR根据新位置对应的地址域的标识信息与上述获取的地址信息， 生成新位置标识 信息。
在本发明实施例中， 当新位置在外地地址域或在家乡地址域的其它位置时， 生成的新位 置标识信息可以称为外地位置标识， 用于作为网络移动后对 MR的全球标识。 MR在家乡地 址域时的位置标识， 可以称为家乡位置标识， 该家乡位置标识始终保持不变， 而 MR的外地 位置标识是可变的， 由 MR接入的新位置对应的地址域根据接入位置分配。 对于网络内部的 终端来说， 不需要修改任何配置， 也不需要感知网络的移动， 无论在哪， 都使用其固定的位 置标识。
例如， 参见图 2， MR1在家乡地址域 LD1时， 其家乡位置标识由家乡地址域 LD1的标 识信息与 MR1在家乡地址域内的地址信息组成， S卩 LD1 ID+211.0.0.2; 参见图 3， MR1在家 乡地址域的其它位置时， 外地位置标识为 LD1 ID+211.0.0.9; 参见图 4， MR1在外地地址域 LD3时， 其外地位置标识由外地地址域 LD3的标识信息与 LD3给 MR1分配的临时地址信息 组成， 即 LD3 ID+2101 :: 1。
503： MR将生成的新位置标识信息发送给家乡地址域内与该 MR对应的 HA。
通常， MR需要向对应的家乡地址域的 HA注册自己所管理网络的位置标识的范围， 即
IPv6中的前缀或 IPv4中的子网网段。 当 MR在家乡地址域的原接入位置时， 已经向对应的 HA注册过在家乡地址域内所管理的子网的位置标识范围， 如 1.0.0.0/24， 此时， 网络内部的 终端通过 MR进行通信， 不需要经过该 HA。 当 MR移动到外地地址域或家乡地址域的其它 位置时， 则重新向该 HA注册在新位置所管理的子网的位置标识范围， 如 2101 : : 1， 此时， 网 络内部的终端通过该 HA进行正常的通信， 即多地址空间网络构架中的其它设备并不知道网 络移动后 MR的新位置， 需要通过该 HA来定位， 该 HA根据 MR发来的注册信息可以获知 MR 的新位置， 并按照该注册信息中的新位置标识信息来转发相关的流量给 MR， 通过 MR 来完成到网络中的终端的通信。
504： HA接收 MR发来的新位置标识信息， 并保存该新位置标识信息， 此时， 形成了 MR与 HA之间的转发隧道。 505： 当 HA接收到报文且该报文的目的地址为该网络中终端的位置标识信息时， HA用 已保存的 MR 的新位置标识信息的全部或部分内容封装该报文， 并将封装后的报文发送给 MR, 在本实施例中， HA用该新位置标识信息封装该报文， 即用新位置标识信息的全部内容 封装报文。
506： MR接收到封装后的报文后， 对该报文进行解封装， 去除其中与新位置相关的标识 信息， 即去除报文中的新位置标识信息， 然后将解封装后的报文转发给该终端。
在本发明实施例中， HA通过 MR与 HA之间的转发隧道， 将所有发往该网络中的终端 的流量封装后转发给 MR， MR收到后进行相应的解封装， 并按家乡的路由方式发送给仍然使 用家乡位置标识的终端。 类似地， 该网络内的终端向外部终端的网络流量也经由 MR封装， 以及通过上述隧道转发到 HA， 再由 HA解封装， 然后按正常路由方式转发给目的终端。
例如， 参见图 1和图 4， 某个网络在家乡网络 LD1 时， MR1 使用接入位置标识 （LD1 ID+211.0.0.2) 接入， 该网络内部的终端都使用 1.0.0.0/24网段的地址， 终端 2具有全球唯一 的位置标识 （LD1 ID+1.0.0.1 )， HA使用位置标识 （LD1 ID+211.0.0.6)。 MR向 HA注册其管 理的网段信息 （可能包含多个网段）。 当该网络移动到外地地址域 LD3 时， 该网络内部的终 端位置标识不变， 仍然使用 （LD1 ID+1.0.0.0/24) 网段的地址， MR1获取到一个临时的地址 信息 2101 :: 1， 则此时它的全球位置标识为 （LD3 ID+2101 :: 1 )， MR1向家乡地址域的 HA更 新自己的接入位置标识信息， 形成 MR1和其对应的 HA之间的转发隧道。 HA根据已保存的 MR1管理的网段信息和 MR的新位置标识信息， 将所有发往该网段 （LD1 ID+1.0.0.0/24) 范 围内的网络流量都封装， 如所有发往终端 2的报文， 经该隧道转发到 MR1的临时接入位置， 再由 MR1解封装， 并按家乡的路由方式发送给仍然使用家乡位置标识的终端。
在本实施例中， 进一步地， 当网络外的外部终端与网络内的终端进行一次通信后， 该外 部终端可以记录 MR的新位置标识信息， 在后续的通信过程中， 可以根据该新位置标识信息 直接与网络内的终端进行通信， 而不用经过 HA进行中转， 从而可以优化路由。
上述方法通过获取 MR的新位置标识信息， 并根据该新位置标识信息进行相应的转发， 实现了在多地址空间网络架构中支持网络的移动， 从而使接入新位置的网络内的终端不用修 改任何配置， 能够完成与网络外部的终端的正常通信。
参见图 6， 为本发明实施例提供的另一种转发报文的方法流程图， 本实施例仍以路由设 备为移动路由器为例进行说明， 该方法具体包括：
601： 当通过移动路由器 MR接入到包含多个地址域的网络构架中的网络， 离开家乡接入 点， 且通过 MR接入到家乡地址域的其它位置时， 在家乡地址域内， MR获取临时地址信息。 例如， 图 2中 MR1在家乡地址域 LD1内的 IPv4地址信息为 211.0.0.2， 该地址信息是按 照家乡地址域 LD1的地址空间 IPv4进行分配的； 图 3中当网络移动到 LD1内的新位置时， LD1给 MR1分配的临时地址信息为 211.0.0.9， 该地址仍然是按照 LD1的地址空间 IPv4进行 分配的。
602： MR根据家乡地址域的标识信息与上述获取的临时地址信息，生成新位置标识信息。
603： MR将生成的新位置标识信息发送给家乡地址域内与该 MR对应的 HA。
604： HA接收 MR发来的新位置标识信息， 并保存该新位置标识信息， 此时， 形成了 MR与 HA之间的转发隧道。
605： 当 HA接收到报文且该报文的目的地址为上述网络中终端的位置标识信息时， HA 用已保存的 MR的新位置标识信息中的临时地址信息封装该报文， 即用新位置标识信息的部 分内容封装报文， 并将封装后的报文发送给 MR。
606： MR接收到封装后的报文后， 对该报文进行解封装， 去除其中的临时地址信息， 然 后将解封装后的报文转发给该终端。
上述步骤均与图 5所示的实施例类似， 在此不再详细叙述。 在本实施例中， 进一步地， 当网络外的外部终端与网络内的终端进行一次通信后， 该外部终端可以记录 MR的新位置标 识信息， 在后续的通信过程中， 可以根据该新位置标识信息直接与网络内的终端进行通信， 而不用经过 HA进行中转， 从而可以优化路由。
图 6所示的方法通过获取 MR的新位置标识信息， 并根据该新位置标识信息的部分内容 进行相应的转发， 实现了在多地址空间网络架构中支持网络的移动， 从而使接入新位置的网 络内的终端不用修改任何配置， 能够完成与网络外部的终端的正常通信。
参见图 7， 本发明实施例还提供了一种家乡代理设备 HA， 应用于包含多个地址域的网络 构架， 具体包括：
标识信息接收模块 701， 用于当通过路由设备接入到上述网络构架中的网络离开家乡接 入点， 且通过该路由设备接入到新位置时， 接收该路由设备发来的新位置标识信息；
报文接收模块 702， 用于接收目的地址为上述网络中终端的位置标识信息的报文； 转发模块 703， 用于用标识信息接收模块 701收到的新位置标识信息的全部或部分内容， 封装报文接收模块 702收到的报文后发送给路由设备。
其中， 转发模块 703具体包括：
家乡地址域转发单元， 用于用标识信息接收模块 701收到的新位置标识信息中的地址信 息封装报文接收模块 702收到的报文， 并将封装后的报文发送给路由设备。 或者转发模块 703具体包括：
外地地址域转发单元， 用于用标识信息接收模块 701收到的新位置标识信息封装报文接 收模块 702收到的报文， 并将封装后的报文发送给路由设备。
上述家乡代理设备通过获取路由设备的新位置标识信息， 并根据该新位置标识信息进行 相应的转发， 实现了在多地址空间网络架构中支持网络的移动， 从而使接入新位置的网络内 的终端不用修改任何配置， 能够完成与网络外部的终端的正常通信。
参见图 8， 本发明实施例还提供了一种路由设备， 应用于包含多个地址域的网络构架， 当通过该路由设备接入到该网络构架中的网络离开家乡接入点后， 该路由设备作为该网络的 新接入点， 具体包括：
处理模块 801， 用于获取路由设备在新接入点对应的地址域内的地址信息， 该地址域具 有标识信息； 还用于根据该标识信息与该地址信息， 生成新位置标识信息；
发送模块 802， 用于发送处理模块 801得到的新位置标识信息给路由设备对应的家乡代 理设备。
进一步地， 上述路由设备还包括：
转发模块， 用于接收上述家乡代理设备发来的目的地址为上述网络中终端的位置标识信 息的报文， 对该报文进行解封装， 去除该报文中与新接入点相关的位置标识信息， 根据解封 装后的报文中终端的位置标识信息， 将解封装后的报文转发给该终端。
本实施例中的路由设备可以具体为移动路由器或拓扑结构点发生变化的固定路由器。 例 如， 固定路由器原来在家乡地址域接入电信运营商的网络， 当该固定路由器的物理位置未改 变， 但通过连线改为接入网通运营商的网络时， 虽然其并未发生移动， 但是其在网络拓扑结 构中的位置却变化了， 所以仍然适用本发明实施例中的技术方案。
上述路由设备通过发送新位置标识信息给家乡代理设备， 使家乡代理设备可以按照该新 位置标识信息进行相关流量的转发， 实现了在多地址空间网络架构中支持网络的移动， 从而 使接入新位置的网络内的终端不用修改任何配置， 能够完成与网络外部的终端的正常通信。
参见图 9， 本发明实施例还提供了一种转发报文的系统， 应用于包含多个地址域的网络 构架， 具体包括：
路由设备 901， 用于当通过该路由设备接入到上述网络构架中的网络离开家乡接入点后， 作为该移动网络的新接入点， 获取路由设备在新接入点对应的地址域内的地址信息， 该地址 域具有标识信息； 还用于根据该标识信息与该地址信息， 生成新位置标识信息， 并发送新位 置标识信息； 家乡代理设备 HA 902, 用于接收路由设备 901发来的新位置标识信息， 当接收到目的地 址为上述网络中终端的位置标识信息的报文时， 用该新位置标识信息的全部或部分内容封装 收到的报文后发送给路由设备 901。
本实施例中， 路由设备 901收到 HA转发的报文后， 对该报文进行解封装， 去除该报文 中与新位置相关的位置标识信息， 根据解封装后的报文中目的终端的位置标识信息， 将解封 装后的报文转发给该终端。
上述系统通过路由设备发送新位置标识信息给 HA， HA根据该新位置标识信息进行相应 的转发， 实现了在多地址空间网络架构中支持网络的移动， 从而使接入新位置的网络内的终 端不用修改任何配置， 能够完成与网络外部的终端的正常通信。
本领域普通技术人员可以理解， 实现上述实施例方法携带的全部或部分步骤是可以通过 程序来指令相关的硬件完成， 所述的程序可以存储于一种计算机可读存储介质中， 该程序在 执行时， 包括方法实施例的步骤之一或其组合。
另外， 在本发明各个实施例中的各功能单元可以集成在一个处理模块中， 也可以是各个 单元单独物理存在， 也可以两个或两个以上单元集成在一个模块中。 上述集成的模块既可以 采用硬件的形式实现， 也可以采用软件功能模块的形式实现。 所述集成的模块如果以软件功 能模块的形式实现并作为独立的产品销售或使用时， 也可以存储在一个计算机可读取存储介 质中。
上述提到的存储介质可以是 MR或 HA的硬盘、 缓存、 只读存储器或光盘等。
以上所述仅为本发明的较佳实施例， 并不用以限制本发明， 凡在本发明的精神和原则之 内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1 . 一种转发报文的方法， 其特征在于， 应用于包含多个地址域的网络构架， 所述方法包 括- 当通过路由设备接入到所述网络构架中的网络离开家乡接入点， 且通过所述路由设备接 入到新位置时， 所述路由设备对应的家乡代理接收所述路由设备发来的新位置标识信息； 所述家乡代理接收到报文，且所述报文的目的地址为所述网络中终端的位置标识信息时， 用所述新位置标识信息的全部或部分内容封装所述报文后发送给所述路由设备。
2. 根据权利要求 1所述的转发报文的方法， 其特征在于， 所述新位置对应的地址域为家 乡地址域， 所述新位置标识信息包括所述家乡地址域的标识信息， 还包括在所述家乡地址域 内的地址信息， 所述用所述新位置标识信息的全部或部分内容封装所述报文后发送给所述路 由设备， 具体为：
所述家乡代理用所述新位置标识信息中的地址信息封装所述报文后， 发送给所述路由设 备。
3. 根据权利要求 1所述的转发报文的方法， 其特征在于， 所述新位置对应的地址域为外 地地址域， 所述新位置标识信息包括所述外地地址域的标识信息， 还包括在所述外地地址域 内的地址信息， 所述用所述新位置标识信息的全部或部分内容封装所述报文后发送给所述路 由设备， 具体为：
所述家乡代理用所述新位置标识信息封装所述报文后发送给所述路由设备。
4. 根据权利要求 1所述的转发报文的方法， 其特征在于， 所述路由设备具体为移动路由 器或拓扑结构点发生变化的固定路由器。
5. 一种转发报文的方法， 其特征在于， 应用于包含多个地址域的网络构架， 所述方法包 括：
当通过路由设备接入到所述网络构架中的网络离开家乡接入点， 且通过所述路由设备接 入到新位置时， 所述路由设备向对应的家乡代理发送新位置标识信息；
所述路由设备接收来自所述家乡代理的目的地址为所述网络中终端的位置标识信息的报 文， 所述报文为所述家乡代理用所述新位置标识信息的全部或部分内容进行封装的； 所述路由设备根据所述新位置标识信息转发所述报文给所述终端。
6. 根据权利要求 5所述的转发报文的方法， 其特征在于， 所述路由设备向对应的家乡代 理发送新位置标识信息， 具体包括：
所述路由设备获取在所述新位置对应的地址域内的地址信息，所述地址域具有标识信息; 所述路由设备根据所述标识信息与地址信息， 生成新位置标识信息；
所述路由设备向对应的家乡代理发送所述新位置标识信息。
7. 根据权利要求 5所述的转发报文的方法， 其特征在于， 所述路由设备根据所述新位置 标识信息转发所述报文给所述终端， 具体包括：
所述路由设备对所述报文进行解封装， 去除与所述新位置相关的位置标识信息； 所述路由设备根据所述解封装后的报文中所述终端的位置标识信息， 将所述解封装后的 报文转发给所述终端。
8. 一种家乡代理设备，其特征在于，应用于包含多个地址域的网络构架，所述设备包括: 标识信息接收模块，用于当通过路由设备接入到所述网络构架中的网络离开家乡接入点， 且通过所述路由设备接入到新位置时， 接收所述路由设备发来的新位置标识信息；
报文接收模块， 用于接收目的地址为所述网络中终端的位置标识信息的报文； 转发模块， 用于用所述标识信息接收模块收到的新位置标识信息的全部或部分内容封装 所述报文接收模块收到的报文后， 发送给所述路由设备。
9. 根据权利要求 8所述的家乡代理设备， 其特征在于， 所述转发模块具体包括： 家乡地址域转发单元， 用于用所述标识信息接收模块收到的新位置标识信息中的地址信 息封装所述报文接收模块收到的报文， 并将所述封装后的报文发送给所述路由设备。
10. 根据权利要求 8所述的家乡代理设备， 其特征在于， 所述转发模块具体包括： 外地地址域转发单元， 用于用所述标识信息接收模块收到的新位置标识信息封装所述报 文接收模块收到的报文， 并将所述封装后的报文发送给所述路由设备。
11 . 一种路由设备， 其特征在于， 应用于包含多个地址域的网络构架， 当通过所述路由 设备接入到所述网络构架中的网络离开家乡接入点后， 所述路由设备作为所述网络的新接入 点， 所述路由设备包括：
处理模块， 用于获取所述路由设备在所述新接入点对应的地址域内的地址信息， 所述地 址域具有标识信息； 还用于根据所述标识信息与地址信息， 生成新位置标识信息；
发送模块， 用于发送所述处理模块得到的新位置标识信息给所述路由设备对应的家乡代 理设备。
12. 根据权利要求 11所述的路由设备， 其特征在于， 所述路由设备还包括： 转发模块， 用于接收所述家乡代理设备发来的报文， 且所述报文的目的地址为所述网络 中终端的位置标识信息， 对所述报文进行解封装， 去除所述报文中与所述新接入点相关的位 置标识信息， 根据所述解封装后的报文中所述终端的位置标识信息， 将所述解封装后的报文 转发给所述终端。
13. 根据权利要求 11所述的路由设备， 其特征在于， 所述路由设备具体为移动路由器或 拓扑结构点发生变化的固定路由器。
14. 一种转发报文的系统， 其特征在于， 应用于包含多个地址域的网络构架， 所述系统 包括：
路由设备， 用于当通过所述路由设备接入到所述网络构架中的网络离开家乡接入点后， 作为所述网络的新接入点， 获取所述网络在所述新接入点对应的地址域内的地址信息， 所述 地址域具有标识信息； 还用于根据所述标识信息与地址信息， 生成新位置标识信息， 并发送 所述新位置标识信息；
家乡代理设备， 用于接收所述路由设备发来的新位置标识信息， 当接收到报文， 且所述 报文的目的地址为所述网络中终端的位置标识信息时， 用所述新位置标识信息的全部或部分 内容封装所述报文后发送给所述路由设备。
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