WO2013083034A1 - 触发更新移动节点映射信息的方法、ms和mn - Google Patents

触发更新移动节点映射信息的方法、ms和mn Download PDF

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Publication number
WO2013083034A1
WO2013083034A1 PCT/CN2012/085897 CN2012085897W WO2013083034A1 WO 2013083034 A1 WO2013083034 A1 WO 2013083034A1 CN 2012085897 W CN2012085897 W CN 2012085897W WO 2013083034 A1 WO2013083034 A1 WO 2013083034A1
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WIPO (PCT)
Prior art keywords
information
communication peer
mapping
peer
communication
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PCT/CN2012/085897
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English (en)
French (fr)
Inventor
成黎
孙默
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中兴通讯股份有限公司
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Priority to US14/434,521 priority Critical patent/US20150236954A1/en
Publication of WO2013083034A1 publication Critical patent/WO2013083034A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/74Address processing for routing
    • H04L45/742Route cache; Operation thereof
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/09Mapping addresses
    • H04L61/10Mapping addresses of different types
    • H04L61/103Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/74Address processing for routing
    • H04L45/741Routing in networks with a plurality of addressing schemes, e.g. with both IPv4 and IPv6
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic control in data switching networks
    • H04L47/10Flow control; Congestion control
    • H04L47/12Avoiding congestion; Recovering from congestion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Definitions

  • the present invention relates to the field of mobile communications and the Internet, and in particular to a method for triggering update of mobile node mapping information, an information reporting method, a mapping server, and a mobile node. Background technique
  • the Locator/ID Separation Protocol (LISP) technology is a popular solution for separating the host identity from the host location identity. As shown in Figure 1, it is the basic logical architecture of the existing LISP network. Its implementation is as follows:
  • the site network (usually referred to as the user network) is separated from the transport network (usually referred to as the carrier network), and the address space is divided into an endpoint identifier (EID, which represents an address within the site network) address space and a route location identifier (Routing Locator) , RLOC , which represents the reachability of the border router network) address space.
  • EID endpoint identifier
  • RLOC route location identifier
  • the routing information inside the site network in the network that is, the EID address information, is not advertised to the transmission network.
  • the two site networks pass between the Ingress Tunnel Router (ITR) and the Egress Tunnel Router (ETR). Establish a tunnel that traverses the transport network to connect.
  • the site network implements the maintenance of mapping information from EID to RLOC through a separate mapping system.
  • the LISP network architecture includes a data plane and a mapping plane.
  • the data plane implements the forwarding and transmission of data packets.
  • the source node that generated the packet in the LISP site sends the packet to the ingress tunnel router ITR at the site.
  • the ITR encapsulates the data packet according to the mapping relationship between the destination node EID address obtained from the mapping plane and the RLOC address of the ETR of the site where the destination node is located, and then sends the encapsulated data packet to the ETR of the destination site.
  • the EDR forwards the data packet to the destination node in the site according to the EID address of the data packet.
  • the mapping plane can help the ITR find the site ETR corresponding to the destination node and obtain mapping information.
  • the LISP mapping plane shown in Figure 1 is forwarded by the mapping plane (the mapping plane forwarding network architecture is various, such as variable logic topology network ALT, authorized data tree network DDT, etc.), map resolver (MR) device. It is composed of a map server (MS) device.
  • the ETR registers the mapping information of the EID to RLOC in the site to the MS.
  • the ITR sends the mapping request message to the MR, and uses the EID address of the destination node as the destination address of the request message.
  • the MR forwards the request to the MS that maintains the destination EID address information through the mapping plane forwarding network, thereby further finding the corresponding site ETR.
  • the ITR caches the mapping information of the MS or the destination station ETR response, the packet forwarding of the data packet is performed.
  • proxy ITR Proxy ITR, PITR
  • proxy ETR Proxy ETR, PETR
  • each LISP Mobile Node is treated as a LISP site, and the LISP MN can perform some functions of ETR and ITR.
  • a LISP MN device includes two types of identifiers: Identity EID, MN's EID address usually does not change; Location ID RLOC, LISP MN can dynamically obtain RLOC address when moving to a new location.
  • the mapping plane forwarding network architecture usually requires the LISP MN to anchor the mapping registration on the corresponding MS. After obtaining the new RLOC address, the MN immediately sends a mapping registration message to the corresponding MS to update the mapping information.
  • the LISP MN is also cached in the peer mapping cache device of the MN (including the ITR device corresponding to the communication peer node, the PITR device corresponding to the communication peer node, and the communication peer LISP MN). Mapping information.
  • some methods for updating the mapping information in the peer mapping cache device by the LISP MN are proposed. For example, after the location switching, the LISP MN sends a mapping request trigger message to the peer that is communicating before the handover; In this paper, the mapping information is set to a short effective time, so that the communication peer can prevent the mapping from being updated in time through frequent mapping request lookup. It is determined whether the mapping information needs to be triggered by the peer according to the version of the destination mapping information received in the data packet. Update; maintain the PITR cache, save all the information of the PITR device that finds the mapping information, and so on.
  • the mobile node can update the mapping cache of the communication peer. But because of one The mobile nodes can simultaneously communicate with multiple communication peer devices, and then correspond to multiple peer mapping cache devices. Based on the method in the prior art, updating the peer cache by the mobile node brings great signaling overhead to the mobile node and increases the burden on the mobile node. Summary of the invention
  • the embodiments of the present invention provide a method for triggering update of mobile node mapping information, an information reporting method, a mapping server, and a mobile node, to overcome the problem of a large amount of signaling overhead required for the mobile node to update the peer cache.
  • An embodiment of the present invention provides a method for triggering update of mobile node (MN) mapping information, which is applied to a Location and Identity Separation Protocol (LISP) network, and the method includes:
  • the mapping server receives the mapping registration information of the update mapping information sent by the MN attached to the MS;
  • the MS obtains the information of the communication peer, and sends a mapping update message to the peer mapping cache device corresponding to the communication peer node of the MN according to the information of the communication peer, triggering the peer mapping cache device update. Cached mapping information.
  • the communication peer end includes the peer mapping cache device
  • the information of the communication peer includes location identifier information of the peer mapping cache device.
  • the method before the MS receives the mapping registration message of the update mapping information sent by the MN attached to the MS, the method further includes:
  • the MS establishes and maintains a communication peer table that stores information of the communication peer end;
  • the information obtained by the MS to obtain the communication peer includes:
  • the MS obtains information of the communication peer from the communication peer table.
  • the information obtained by the MS by the communication peer includes:
  • the MS obtains information of the communication peer end from the mapping registration message.
  • the MS maintains a communication peer table that saves information of the communication peer end, including: the MS presets a time value for each entry in the communication peer table, and in the table When the time of the item exceeds the time value, the entry is deleted. The time value is greater than the time interval reported by the communication peer.
  • the MS maintains a communication peer table that saves the information of the communication peer, and further includes: the MS compares the received information of the current communication peer with the entry in the communication peer table, if If there is no duplicate entry, a new entry is created in the communication peer table, and the information of the current communication peer is written in the new entry; if there are duplicate entries, The time value is reset to an initial value.
  • the MS maintains a communication peer table that saves the information of the communication peer, and further includes: deleting, by the MS, that the MN is offline or shutting down, deleting the mapping information registered by the MN, and deleting the MN as the MN The communication peer table maintained.
  • An embodiment of the present invention provides an information reporting method, which is applied to a Location and Identity Separation Protocol (LISP) network, where the method includes:
  • the mobile node After receiving the data packet sent by the communication peer node of the MN, the mobile node (MN) extracts the information of the communication peer end from the data packet; the MN reports the information to the mapping server (MS) corresponding to the MN. Communication peer information.
  • the communication peer end includes a peer mapping cache device corresponding to the communication peer node of the MN; and the information of the communication peer end includes location identifier information of the peer mapping cache device.
  • the method further includes: comparing, by the MN, information of the communication peer end with an entry in the established peer information table. If the information of the communication peer is not included in the entry, a new entry is created in the peer information table, and the information of the communication peer is added to the new entry.
  • the information that the MN sends to the MS the communication peer includes:
  • the MN periodically sends information to the MS to the communication peer;
  • the MN reports the information of the communication peer to the MS.
  • the information that the MN sends to the MS the communication peer includes:
  • the MN sends the information of the communication peer to the MS in real time.
  • the method further includes: the MN setting a preset for the entry in the peer information table The current time interval is deleted if the data packet sent by the communication peer node of the MN corresponding to the current entry is not received within the predetermined time interval.
  • the embodiment of the present invention further provides a mapping server (MS), which is applied to a location and identity separation protocol (LISP) network, where the MS includes:
  • a receiving module configured to: receive a mapping registration message of update mapping information sent by the MN attached to the MS;
  • the triggering update module is configured to: obtain information of the communication peer end, and send a mapping update message to the peer mapping cache device corresponding to the communication peer end node of the MN according to the information of the communication peer end, triggering the peer mapping cache The device updates the cached mapping information.
  • the communication peer end includes the peer mapping cache device
  • the information of the communication peer includes location identifier information of the peer mapping cache device.
  • the MS further includes establishing a maintenance module
  • the receiving module is further configured to: receive information about the communication peer reported by the MN; and the establishing maintenance module is configured to: establish and maintain a communication peer table that stores information of the communication peer end;
  • the trigger update module is configured to: obtain information of the communication peer from the communication peer table.
  • the trigger update module is configured to: obtain information about the communication peer from the mapping registration message.
  • the establishing maintenance module is configured to: preset a time value for each entry in the communication peer table, and delete the time when the existence time of the entry exceeds the time value The entry is greater than a time interval on the information of the communication peer.
  • the establishing the maintenance module is further configured to: compare the received information of the current communication peer with the entry in the communication peer table, and if there is no duplicate entry, the communication pair A new entry is created in the end table, and the information of the current communication peer is written in the new entry; if there is a duplicate entry, the time value is reset to an initial value.
  • the establishing the maintenance module is further configured to: discover that the MN is offline or powered off, Deleting the mapping information registered by the MN, and deleting the communication peer table maintained for the MN.
  • the embodiment of the present invention further provides a mobile node (MN), which is applied to a location and identity separation protocol (LISP) network, where the MN includes:
  • the extraction module is configured to: after receiving the data packet sent by the communication peer node of the MN, extract the information of the communication peer end from the data packet;
  • the reporting module is configured to: report the information of the communication peer to the mapping server (MS) corresponding to the MN.
  • the communication peer end includes a peer mapping cache device corresponding to the communication peer node of the MN; and the information of the communication peer end includes location identifier information of the peer mapping cache device.
  • the upper module is configured to: periodically or in real time send information to the MS to the communication peer; or, after the mapping information changes, report the information of the communication peer to the MS.
  • mapping server corresponding to the mobile node initiates the mapping information update of the peer mapping cache device, which better overcomes the problem of updating the peer cache by the mobile node.
  • 1 is a network architecture diagram of a first LISP embodiment 1;
  • FIG. 2 is a network architecture diagram of a second embodiment of the LISP
  • FIG. 3 is a signaling flow chart of Embodiment 1 of a method for updating MN mapping information according to the present invention
  • FIG. 4 is a signaling flow chart of Embodiment 2 of a method for updating MN mapping information according to the present invention
  • FIG. 5 is a flowchart for updating MN mapping information according to the present invention.
  • FIG. 6 is a schematic structural diagram of an embodiment of an MS according to the present invention.
  • Fig. 7 is a schematic structural view of an embodiment of the MN of the present invention.
  • Communication peer node A node that communicates with the LISP MN.
  • the node can be located in the LISP network or in a traditional network; it can be a mobile node or a static node whose location usually does not change.
  • the peer mapping cache device performs LISP encapsulation and forwarding on the data packet sent by the communication peer node to the LISP MN, and may cache the LISP MN mapping information.
  • Such devices include ITR devices or PITR devices corresponding to the communication peer node.
  • the peer LISP MN is both a communication peer node and a peer mapping cache device.
  • the embodiment of the present invention provides a method for triggering update of mobile node (MN) mapping information, which is applied to a location and identity separation protocol (LISP) network.
  • MN mobile node
  • LISP location and identity separation protocol
  • Step 11 The mapping server (MS) receives the mapping registration message of the update mapping information sent by the MN attached to the MS;
  • the method further includes:
  • the MS establishes and maintains a communication peer table that stores information of the communication peer.
  • Step 12 The MS obtains the information of the communication peer, and sends a mapping update message to the peer mapping cache device corresponding to the communication peer node of the MN according to the information of the communication peer, and triggers the peer mapping.
  • the cache device updates the cached mapping information.
  • the communication peer end may include the peer mapping cache device; and may further include a communication peer node; the information of the communication peer end may be location identifier information of the communication peer end.
  • the obtaining, by the MS, the information of the communication peer includes: obtaining, by the MS, the information of the communication peer from the communication peer table, or obtaining the information of the communication peer from the mapping registration message.
  • An embodiment of the present invention provides an information reporting method, which is applied to a location and identity separation protocol.
  • Step 21 After receiving the data packet sent by the communication peer node of the MN, the mobile node (MN) extracts information of the communication peer end from the data packet;
  • the communication peer includes a peer mapping cache device corresponding to the communication peer node of the MN; and the information of the communication peer includes location identifier information of the peer mapping cache device.
  • Step 22 The MN reports the information of the communication peer to the mapping server (MS) corresponding to the MN.
  • MS mapping server
  • the information of the communication peer of the MN to the MS includes:
  • the MN periodically or in real time sends the information of the communication peer to the MS; or the MN reports the information of the communication peer to the MS after the mapping information changes.
  • the following describes the technical solution of the embodiment of the present invention from the perspective of the interaction between the MS, the MN, the communication peer node, and the peer mapping cache device:
  • Step 301 A communication peer node of a LISP MN sends a data packet to the LISP MN, where a destination address and a source address of the data packet correspond to the LISP MN and the communication peer respectively. The identity of the node. The data packet is forwarded to a peer mapping cache device corresponding to the communication peer node;
  • Step 302 The peer mapping cache device performs LISP encapsulation on the data packet according to the mapping information of the LISP MN that is cached locally or obtained through the mapping plane.
  • the destination address and the source address of the data packet respectively correspond to the location identifiers of the LISP MN and the peer mapping cache device;
  • Step 303 The peer mapping cache device sends the data packet to the LISP MN through a tunnel. Steps 301-303 are all prior art.
  • Step 304 After receiving the data packet encapsulated by the LISP, the LISP MN extracts the communication from the data packet. Relevant information of the peer;
  • the LISP MN can store information of multiple communication peers, and then form a peer information table established and maintained by the LISP MN, which is called a MN-peer table; the communication peer includes at least a peer mapping cache device, and can also include communication.
  • the LISP MN compares with the entries in the MN-peer table. If there is no such extracted information in the MN-peer table, the MN creates a new entry in the table to add the information.
  • the main purpose of the LISP MN to establish the peer information table is to facilitate the timely update of the mapping information in the peer mapping cache device. Therefore, only the peer mapping cache device may be recorded in the MN-peer table. Location identification information.
  • the LISP MN can also select related information of the communication peer node and the peer mapping cache device simultaneously according to actual needs.
  • Step 305 The LISP MN periodically reports the information in the MN-peer table to the corresponding MS. Based on the prior art, the LISP MN periodically sends the mapping registration message to the MS.
  • the information of the MN-pair table may be additionally added to the mapping registration message of the LISP MN for reporting; optionally, the LISP MN may also use other information on the peer to communicate with the peer. The function of reporting the above information is sufficient.
  • Step 306 The MS establishes and maintains a communication peer table for each registered LISP MN, which is called an MS-MN-peer table, and the MS can find the corresponding MS-MN-peer table according to the identity of the LISP MN. ;
  • the MS After receiving the peer information reported by the LISP MN, the MS fills in the reported peer information.
  • the MS can manage the MS-MN-peer table based on the aging mechanism.
  • the MS should set a time value for each entry in the peer table.
  • the preset time value of the entry corresponds to the lifetime of the entry.
  • this value is set to the initial value. Then, if the entry is not received, and the entry exceeds the preset value, the entry is considered to be aged and deleted.
  • the time value should be greater than the time interval between the LISP MN and the communication peer information.
  • the peer information reported by the LISP MN may have an entry that is currently maintained by the MS.
  • the MS-MN-repeating entries in the peer table are repeated. Therefore, before the MS fills in the MS-MN-peer table, the MS needs to compare whether there are duplicate entries. If there is a duplicate entry, the valid time of the entry in the MS-MN-peer table is reset to the initial value; if the entry is not repeated, a new entry is created in the MS-MN-peer table. Fill in the newly reported information.
  • the MS deletes the mapping information registered by the LISP MN, and deletes the MS-MN-peer table maintained for the LISP MN.
  • Step 307 The MS returns a communication peer information receiving response message to the LISP MN.
  • the MS may return a notification to confirm the message.
  • the message can be extended for the communication peer information receiving response.
  • Step 308 After the mapping information of the LISP MN changes, the mapping registration message is sent to the MS immediately;
  • Step 309 After receiving the new mapping information of the LISP MN, the MS updates the mapping information of the local record.
  • Step 310 The MS sends a peer mapping update packet to the peer mapping cache device according to the information in the MS-MN-peer table corresponding to the locally maintained LISP MN, where the packet carries the new mapping information of the LISP MN.
  • Steps 311a and 311b are optional steps.
  • the peer mapping cache device may initiate a mapping request message to the mapping plane to obtain the mapping information of the LISP MN to ensure the correctness of the information.
  • Step 312 The peer mapping cache device updates the cached LISP MN mapping information. It is worth noting that if the LISP MN mapping information is not included in the current peer mapping cache device, after receiving the mapping update packet sent by the MS, The end mapping cache device may choose not to add the mapping information to the cache, but to re-find when packet forwarding is required.
  • Step 313 The peer mapping cache device responds to the peer mapping update acknowledgement message to the MS. It is worth noting that if the peer mapping cache device does not currently cache the mapping information of the LISP MN, and the update packet is not added after receiving the update packet, The mapping information of the LISP MN may, when responding to the update acknowledgement message, may indicate to the MS that the peer mapping cache device that is not currently the LISP MN is specified, The MS is required to remove the corresponding entry in the MS-MN-peer table.
  • Step 314 The MS updates the content of the acknowledgement packet according to the received mapping, and performs related operations, such as deleting some peer information entries in the MS-MN-peer table.
  • FIG. 4 it is a signaling flowchart of the second embodiment of the method for updating the MN mapping information of the present invention.
  • the embodiment is applicable to the LISP MN real-time updating related information of the communication peer end on the corresponding MS. As shown in FIG. 4, the following steps are specifically included:
  • Steps 401-403 are the same as steps 301-303;
  • Step 404 After receiving the data packet encapsulated by the LISP, the LISP MN extracts related information of the communication peer end from the data packet.
  • the LISP MN can store information of multiple communication peers, and then form a peer information table established and maintained by the LISP MN, which is called a MN-peer table;
  • the LISP MN compares with the entries in the MN-peer table. If there is no extracted information in the entry, the MN creates a new entry in the table to add the information.
  • the entry in the MN-peer table maintained by the LISP MN may be set to a predetermined time interval, and if the communication peer node corresponding to the MN corresponding to the entry is not received in the predetermined time interval, The data packet can delete the corresponding entry in the peer table.
  • Step 405 When the MN-peer table maintained by the LISP MN needs to add or delete an entry, the LISP MN reports the added or deleted entry information to the corresponding MS, and indicates an operation on the entry.
  • Step 406 The MS establishes and maintains a communication peer table for each registered LISP MN, which is called an MS-MN-peer table, and the MS can find the corresponding MS-MN-peer table according to the identity of the LISP MN. ;
  • the MS After receiving the information reported by the LISP MN, the MS performs the addition or deletion of the entry in the MS-MN-peer table according to the operation in the report message;
  • Steps 407-414 are the same as steps 307-314.
  • FIG. 5 it is a signaling flowchart of the third embodiment of the method for updating the MN mapping information of the present invention.
  • the embodiment is applicable to the related information of the communication peer to the corresponding MS when the LISP MN mapping information is changed. As shown in FIG. 5, the following steps are specifically included:
  • Steps 501-504 are the same as steps 301-304;
  • Step 505 The mapping information of the LISP MN changes; usually, the location identifier of the LISP MN changes, such as the location switching of the LISP MN, and a new location identifier is obtained;
  • Step 506 The LISP MN sends a mapping registration message to the corresponding MS, and updates the mapping information.
  • the LISP MN may carry the communication peer information in the MN-peer table in the message;
  • the other communication terminal information may be used to implement the function of reporting the information.
  • Step 507 After receiving the mapping registration message of the LISP MN, the MS updates the locally saved mapping information.
  • Step 508 The information about the communication peer obtained by the MS is sent to the communication peer of the LISP MN to send the peer mapping update packet, where the packet carries the new mapping information of the LISP MN.
  • Steps 509-511 are the same as steps 311-313;
  • Step 512 After receiving the update response of all communication peers, the MS may send an update completion response to the LISP MN.
  • the mobile node reports the information of the peer mapping cache device to the corresponding mapping server, and the mapping server manages the information of the communication peer end of the mobile node, and notifies the peer mapping cache device when the mapping information registered by the mobile node changes. Updating the cached mapping information reduces the amount of signaling overhead that the mobile node needs to perform the peer notification, and reduces the burden on the mobile node.
  • FIG. 6 is a schematic structural diagram of an MS embodiment of the present invention, where the MS includes a receiving module.
  • the receiving module is configured to receive a mapping of update mapping information sent by the MN attached to the MS Register 4 articles;
  • the trigger update module is configured to obtain the information of the communication peer end, and send a mapping update message to the peer mapping cache device corresponding to the communication peer end node of the MN according to the information of the communication peer end, and trigger the peer mapping cache.
  • the device updates the cached mapping information.
  • the communication peer end may include the peer mapping cache device; the information of the communication peer end may include location identifier information of the peer mapping cache device; of course, the communication peer end may further include a communication peer node. .
  • the MS further includes an establishment maintenance module 63, where: the receiving module is further configured to receive information about the communication peer reported by the MN; and the establishing maintenance module is configured to establish and maintain the communication.
  • the trigger update module is configured to obtain information about the communication peer end from the mapping registration message, and the process of triggering the update of the MS may be referred to FIG. 5.
  • the establishing maintenance module is configured to preset a time value for each entry in the communication peer table, and delete the table when the existence time of the entry exceeds the time value.
  • the time value is greater than a time interval on the information of the communication peer.
  • the establishing maintenance module is further configured to compare the received information of the current communication peer with the entry in the communication peer table, and if there is no duplicate entry, the communication peer table Establishing a new entry in the new entry, and writing the information of the current communication peer in the new entry; if there is a duplicate entry, resetting the time value to an initial value.
  • the establishing maintenance module is further configured to: when the MN is offline or powered off, delete the mapping information registered by the MN, and delete the communication peer table maintained by the MN.
  • the MS When the mapping information registered by the MN changes, the MS notifies the peer mapping cache device to update the cache mapping information, which reduces the large amount of signaling overhead that the mobile node needs to perform the peer notification, and reduces the burden on the mobile node.
  • the MN includes an extraction module 71 and a reporting module 72, where: an extraction module, configured to receive a data packet sent by the communication peer node of the MN, Extracting information of the communication peer end in the data packet; reporting module, for The mapping server (MS) corresponding to the MN reports the information of the communication peer.
  • an extraction module configured to receive a data packet sent by the communication peer node of the MN, Extracting information of the communication peer end in the data packet
  • reporting module for The mapping server (MS) corresponding to the MN reports the information of the communication peer.
  • MS mapping server
  • the communication peer includes a peer mapping cache device corresponding to the communication peer node of the MN; and the information of the communication peer includes location identifier information of the peer mapping cache device.
  • the reporting module is configured to report the information of the communication peer to the MS in a timed or real time; or, after the mapping information is changed, report the information of the communication peer to the MS.
  • the MN reports the information of the communication peer to the corresponding mapping server, so that when the mapping information registered by the MN changes, the MS notifies the peer mapping cache device to update the cache mapping information, which reduces the need for the mobile node to perform peer notification. A large amount of signaling overhead is incurred, which reduces the burden on the mobile node.
  • mapping server corresponding to the mobile node initiates the mapping information update of the peer mapping cache device, which better overcomes the problem of updating the peer cache by the mobile node.

Abstract

一种触发更新移动节点映射信息的方法、信息上报方法、映射服务器和移动节点,应用于位置与身份分离协议(LISP)网络中,其中,触发更新移动节点映射信息的方法包括:映射服务器(MS)接收所述 MS下附的 MN 发送的更新映射信息的映射注册报文;所述 MS获得通信对端的信息,并根据所述通信对端的信息向所述 MN的通信对端节点对应的对端映射缓存设备发送映射更新报文,触发所述对端映射缓存设备更新缓存的映射信息。上述方案在移动节点映射信息变化时,由移动节点对应的映射服务器发起对端映射缓存设备的映射信息更新,较好地克服了由移动节点去更新对端缓存所需要承担的大量信令开销的问题。

Description

触发更新移动节点映射信息的方法、 MS和 MN
技术领域
本发明涉及移动通讯领域和互联网领域, 具体涉及一种触发更新移动节 点映射信息的方法、 信息上报方法、 映射服务器和移动节点。 背景技术
为了解决路由表规模不断扩大的问题, 更好地满足用户对移动性支持、 多归属网络部署及流量工程部署等技术的需求, 身份和位置分离的网络架构 设计成为当前业界关注的热点。
位置与身份分离协议(Locator/ID Separation Protocol, LISP )技术就是 一种较为流行的基于主机身份标识与主机位置标识分离的解决方案, 如图 1 所示, 为现有 LISP网络的基本逻辑架构, 其实现方式如下:
站点网络(通常指用户网络) 与传输网络(通常指运营商网络)分离, 地址空间被划分为端点身份标识(Endpoint Identifier, EID, 表示站点网络内 的地址)地址空间与路由位置标识( Routing Locator , RLOC , 表示边界路由 器网络内的可达性)地址空间。 网络中的站点网络内部的路由信息, 即 EID 地址信息,不发布到传输网络中,两个站点网络通过入口隧道路由器( Ingress Tunnel Router, ITR )和出口隧道路由器 ( Egress Tunnel Router, ETR )之间 建立穿越传输网络的隧道进行连接。 站点网络通过一个单独的映射系统来实 现 EID到 RLOC的映射信息的维护。
如图 1所示, LISP网络架构中包括数据平面和映射平面。
数据平面实现数据包的转发和传输。 如图 1所示, LISP站点中生成数据 包的源节点将数据包发送至所在站点的入口隧道路由器 ITR。 ITR根据緩存 的或从映射平面查找获取的目的节点 EID地址到目的节点所在站点 ETR的 RLOC地址间的映射关系,对数据包进行 LISP封装,然后将封装的数据包发 送至目的站点的 ETR。 ETR去除数据包的外层 LISP封装后, 根据数据包目 的 EID地址将数据包转发给站点内的目的节点。 映射平面可帮助 ITR查找到目的节点对应的站点 ETR, 获取映射信息。 图 1所示的 LISP映射平面由映射平面转发网络(映射平面转发网络架构有 多种, 如可变逻辑拓朴网络 ALT、 授权数据树网络 DDT等) 、 映射解析器 ( map resolver, MR )设备和映射服务器( map server, MS )设备构成。 ETR 将站点内 EID到 RLOC的映射信息注册到 MS。 当 LISP站点中的 ITR需查 找目的节点映射信息时, ITR将映射请求报文发送至 MR, 并以目的节点的 EID地址作为请求 ^艮文目的地址。 MR通过映射平面转发网络将请求^艮文转 发至维护目的 EID地址信息的 MS,从而进一步查找到对应的站点 ETR。 ITR 緩存 MS或目的站点 ETR响应的映射信息后, 执行数据包的封装转发。
值得说明的是, 为了实现 LISP网络与传统网络的互通, LISP架构中还 引入了代理 ITR ( Proxy ITR, PITR )和代理 ETR ( Proxy ETR, PETR )设备, 数据包转发过程中可看作传统网络通信节点对应的 ITR和 ETR。
如图 2所示, LISP架构中为实现对移动性的支持, 将每个 LISP移动节 点 ( Mobile Node, MN )看作一个 LISP站点, LISP MN可执行 ETR和 ITR 的部分功能。 一个 LISP MN设备上包括两种标识: 身份标识 EID, MN的 EID地址通常不会发生变化; 位置标识 RLOC, LISP MN移动到新位置时, 可动态获取 RLOC地址。 目前, 映射平面转发网络架构中通常要求 LISP MN 将映射注册锚定在对应的 MS上。 MN获取新的 RLOC地址后, 立刻向对应 的 MS发送映射注册 文, 更新映射信息。
除 LISP MN对应的 MS夕卜, MN的对端映射緩存设备 (包括通信对端节 点对应的 ITR设备、通信对端节点对应的 PITR设备以及通信对端 LISP MN ) 中也緩存了所述 LISP MN的映射信息。 现有技术中提出了由 LISP MN更新 对端映射緩存设备中映射信息的一些方法, 例如, 位置切换后, LISP MN向 切换前正进行通信的对端发送映射请求触发报文; 在映射响应报文中为映射 信息设置很短的有效时间, 使通信对端通过频繁的映射请求查找来避免映射 更新不及时; 根据接收到数据包中的目的映射信息版本号判断是否需要触发 对端进行映射信息更新; 维护 PITR緩存,保存所有查找映射信息的 PITR设 备的信息等。
依据上述方法, 移动节点可对通信对端的映射緩存进行更新。 但由于一 个移动节点可同时与多个通信对端设备通信, 继而对应多个对端映射緩存设 备。 基于现有技术中的方法, 由移动节点去更新对端緩存, 会为移动节点带 来极大的信令开销, 增加移动节点的负担。 发明内容
本发明实施例提供了一种触发更新移动节点映射信息的方法、 信息上报 方法、 映射服务器和移动节点, 以克服由移动节点去更新对端緩存所需要承 担的大量信令开销的问题。
本发明实施例提供了一种触发更新移动节点 (MN ) 映射信息的方法, 应用于位置与身份分离协议(LISP ) 网络中, 该方法包括:
映射服务器(MS )接收所述 MS下附的 MN发送的更新映射信息的映射 注册 4艮文;
所述 MS获得通信对端的信息, 并才艮据所述通信对端的信息向所述 MN 的通信对端节点对应的对端映射緩存设备发送映射更新报文, 触发所述对端 映射緩存设备更新緩存的映射信息。
优选地, 所述通信对端包括所述对端映射緩存设备;
所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
优选地, 所述 MS接收所述 MS下附的 MN发送的更新映射信息的映射 注册报文之前, 所述方法还包括:
所述 MS接收所述 MN上报的所述通信对端的信息;
所述 MS建立并维护保存所述通信对端的信息的通信对端表;
所述 MS获得通信对端的信息包括:
所述 MS从所述通信对端表中获得所述通信对端的信息。
优选地, 所述 MS获得通信对端的信息包括:
所述 MS从所述映射注册报文中获得所述通信对端的信息。
优选地, 所述 MS维护保存所述通信对端的信息的通信对端表, 包括: 所述 MS为所述通信对端表中的每个表项预设一个时间值, 并在所述表 项的存在时间超过所述时间值时, 删除该表项; 其中, 所述时间值大于所述 通信对端的信息上报的时间间隔。
优选地,所述 MS维护保存所述通信对端的信息的通信对端表,还包括: 所述 MS将接收到的当前通信对端的信息与所述通信对端表中的表项进 行比较, 若不存在重复的表项, 则在所述通信对端表中建立新的表项, 并在 所述新的表项中写入所述当前通信对端的信息; 若存在重复的表项, 则将所 述时间值重置为初始值。
优选地,所述 MS维护保存所述通信对端的信息的通信对端表,还包括: 所述 MS发现所述 MN离线或关机, 则删除所述 MN注册的映射信息, 同时删除为所述 MN维护的所述通信对端表。
本发明实施例提供了一种信息上报方法, 应用于位置与身份分离协议 ( LISP ) 网络中, 该方法包括:
移动节点 (MN )接收所述 MN的通信对端节点发送的数据包后, 从所 述数据包中提取出通信对端的信息; 所述 MN向所述 MN对应的映射服务器 ( MS )上报所述通信对端的信息。
优选地, 所述通信对端包括所述 MN的通信对端节点对应的对端映射緩 存设备; 所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
优选地, 所述 MN从所述数据包中提取出通信对端的信息之后, 所述方 法还包括: 所述 MN将所述通信对端的信息与已建立的对端信息表中的表项 进行比较, 若所述表项中没有所述通信对端的信息, 则在所述对端信息表中 建立新表项, 并将所述通信对端的信息添加到所述新表项中。
优选地, 所述 MN向所述 MS上"¾所述通信对端的信息包括:
所述 MN定时向所述 MS上 ^所述通信对端的信息; 或者
所述 MN在映射信息发生变化后,向所述 MS上报所述通信对端的信息。 优选地, 所述 MN向所述 MS上"¾所述通信对端的信息包括:
所述 MN实时向所述 MS上 ^所述通信对端的信息。
优选地, 所述方法还包括: 所述 MN为所述对端信息表中的表项设置预 定时间间隔 , 若在所述预定时间间隔内未收到当前表项对应的所述 MN的通 信对端节点发送的数据包, 则删除所述当前表项。
本发明实施例还提供了一种映射服务器(MS ) , 应用于位置与身份分离 协议(LISP ) 网络中, 该 MS包括:
接收模块, 设置为: 接收所述 MS下附的 MN发送的更新映射信息的映 射注册报文;
触发更新模块, 设置为: 获得通信对端的信息, 并根据所述通信对端的 信息向所述 MN的通信对端节点对应的对端映射緩存设备发送映射更新报文 , 触发所述对端映射緩存设备更新緩存的映射信息。
优选地, 所述通信对端包括所述对端映射緩存设备;
所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
优选地, 所述 MS还包括建立维护模块;
所述接收模块, 还设置为: 接收所述 MN上报的所述通信对端的信息; 所述建立维护模块, 设置为: 建立并维护保存所述通信对端的信息的通 信对端表;
所述触发更新模块, 是设置为: 从所述通信对端表中获得所述通信对端 的信息。
优选地, 所述触发更新模块, 是设置为: 从所述映射注册报文中获得所 述通信对端的信息。
优选地, 所述建立维护模块, 是设置为: 为所述通信对端表中的每个表 项预设一个时间值, 并在所述表项的存在时间超过所述时间值时, 删除该表 项; 其中, 所述时间值大于所述通信对端的信息上 的时间间隔。
优选地, 所述建立维护模块, 还设置为: 将接收到的当前通信对端的信 息与所述通信对端表中的表项进行比较, 若不存在重复的表项, 则在所述通 信对端表中建立新的表项, 并在所述新的表项中写入所述当前通信对端的信 息; 若存在重复的表项, 则将所述时间值重置为初始值。
优选地, 所述建立维护模块, 还设置为: 发现所述 MN离线或关机, 则 删除所述 MN注册的映射信息,同时删除为所述 MN维护的所述通信对端表。 本发明实施例还提供了一种移动节点 (MN ) , 应用于位置与身份分离 协议( LISP ) 网络中, 该 MN包括:
提取模块, 设置为: 接收所述 MN的通信对端节点发送的数据包后, 从 所述数据包中提取出通信对端的信息;
上报模块, 设置为: 向所述 MN对应的映射服务器(MS )上报所述通 信对端的信息。
优选地, 所述通信对端包括所述 MN的通信对端节点对应的对端映射緩 存设备; 所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
优选地, 所述上 模块, 是设置为: 定时或实时向所述 MS上"¾所述通 信对端的信息; 或者, 在映射信息发生变化后, 向所述 MS上报所述通信对 端的信息。
上述触发更新移动节点映射信息的方法, 在移动节点映射信息变化时, 由移动节点对应的映射服务器发起对端映射緩存设备的映射信息更新, 较好 地克服了由移动节点去更新对端緩存所需要承担的大量信令开销的问题。 附图概述
图 1是现有的 LISP实施例一的网络架构图;
图 2是现有的 LISP实施例二的网络架构图;
图 3是本发明更新 MN映射信息的方法实施例一的信令流程图; 图 4是本发明更新 MN映射信息的方法实施例二的信令流程图; 图 5是本发明更新 MN映射信息的方法实施例三的信令流程图; 图 6是本发明 MS实施例的结构示意图;
图 7是本发明 MN实施例的结构示意图。
本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。 需要说明的是, 在 不冲突的情况下, 本申请中的实施例及实施例中的特征可以相互任意组合。 为了更清楚地描述本发明实施例的内容, 在此对本发明实施例中使用的 部分技术术语进行如下说明:
通信对端节点: 与所述 LISP MN进行通信的节点。 该节点可位于 LISP 网络中, 也可位于传统网络中; 可以是移动节点, 也可以是位置通常不发生 变化的静态节点。
对端映射緩存设备: 对通信对端节点发往所述 LISP MN的数据包进行 LISP封装转发, 可能緩存所述 LISP MN映射信息的设备。 此类设备包括通 信对端节点对应的 ITR设备或 PITR设备。
值得注意的是, 若所述 LISP MN的通信对端节点也为 LISP MN, 则该 对端 LISP MN既为通信对端节点, 也为对端映射緩存设备。
本发明实施例提供了一种触发更新移动节点 (MN ) 映射信息的方法, 应用于位置与身份分离协议(LISP ) 网络中, 该实施例是从 MS的角度进行 描述, 该方法包括:
步骤 11、 映射服务器 (MS )接收所述 MS下附的 MN发送的更新映射 信息的映射注册报文;
所述 MS接收所述 MS下附的 MN发送的映射注册^艮文之前, 所述方法 还包括:
所述 MS接收所述 MN上报的所述通信对端的信息;
所述 MS建立并维护保存所述通信对端的信息的通信对端表。
步骤 12、 所述 MS获得通信对端的信息, 并才艮据所述通信对端的信息向 所述 MN的通信对端节点对应的对端映射緩存设备发送映射更新报文, 触发 所述对端映射緩存设备更新緩存的映射信息。
其中, 所述通信对端可以包括所述对端映射緩存设备; 还可以包括通信 对端节点; 所述通信对端的信息可以为通信对端的位置标识信息。
所述 MS获得通信对端的信息包括: 所述 MS从所述通信对端表中获得 所述通信对端的信息, 或者, 从所述映射注册报文中获得所述通信对端的信 息。 本发明实施例提供了一种信息上报方法, 应用于位置与身份分离协议
( LISP ) 网络中, 该实施例是从 MN的角度进行描述, 该方法包括:
步骤 21、 移动节点 (MN )接收所述 MN的通信对端节点发送的数据包 后, 从所述数据包中提取出通信对端的信息;
其中, 所述通信对端包括所述 MN的通信对端节点对应的对端映射緩存 设备; 所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
步骤 22、 所述 MN向所述 MN对应的映射服务器 ( MS )上报所述通信 对端的信息。
所述 MN向所述 MS上"¾所述通信对端的信息包括:
所述 MN定时或者实时向所述 MS上 ^所述通信对端的信息; 或者 所述 MN在映射信息发生变化后,向所述 MS上报所述通信对端的信息。 下面从 MS、 MN、通信对端节点和对端映射緩存设备交互的角度对本发 明实施例的技术方案进行描述:
实施例一
如图 3所示,是本发明更新 MN映射信息的方法实施例一的信令流程图, 本实施例适用于 LISP MN向对应的 MS定时上 通信对端相关信息, 更新 MS维护的 LISP MN的 MS-MN-对端表。 如图 3所示, 具体包括以下步骤: 步骤 301、 LISP MN的通信对端节点向所述 LISP MN发送数据包, 该数 据包的目的地址和源地址分别对应于所述 LISP MN和通信对端节点的身份 标识。 该数据包被转发至通信对端节点对应的对端映射緩存设备;
步骤 302、 对端映射緩存设备依据本地緩存的或通过映射平面查找获取 后緩存的 LISP MN的映射信息对数据包进行 LISP封装;
该数据包的目的地址和源地址分别对应于所述 LISP MN和对端映射緩 存设备的位置标识;
步骤 303、 对端映射緩存设备通过隧道将数据包发送给所述 LISP MN; 步骤 301-303均为现有技术。
步骤 304、 LISP MN接收到 LISP封装的数据包后,从数据包中提取通信 对端的相关信息;
LISP MN可保存多个通信对端的信息, 继而构成一个由 LISP MN建立 并维护的对端信息表, 称为 MN-对端表; 上述通信对端至少包括对端映射緩 存设备, 还可以包括通信对端节点;
进一步地, LISP MN提取相关信息后 ,与 MN-对端表中的表项进行比较。 若 MN-对端表中无所述提取的信息,则 MN在表中建立新表项添加所述信息。
值得说明的是,本发明中 LISP MN建立该对端信息表的主要目的是为了 便于对端映射緩存设备中映射信息的及时更新, 因而 MN-对端表中可仅记录 对端映射緩存设备的位置标识信息。
优选地, LISP MN也可才艮据实际需求, 选择同时记录通信对端节点和对 端映射緩存设备的相关信息。
步骤 305、 LISP MN将 MN-对端表中的信息定时上报到对应的 MS; 基于现有技术, LISP MN会周期发送映射注册报文到 MS。本实施例中, 可选择将 MN-对端表的信息附加在 LISP MN的映射注册报文中进行上报; 可选地, LISP MN也可釆用其他 文上 ^艮通信对端的相关信息, 实现上 述信息上报的功能即可。
步骤 306、 MS为每个注册的 LISP MN建立并维护一个通信对端表, 称 为 MS-MN-对端表, MS可根据 LISP MN的身份标识查找到其对应的 MS-MN- 对端表;
MS接收到所述 LISP MN上报的对端信息后, 将上报的对端信息填入
LISP MN对应的 MS-MN-对端表中;
值得说明的是, 本实施例中, MS可基于老化机制对 MS-MN-对端表进 行管理。 这种情况下, MS应为对端表中的每个表项都设定一个时间值, 表 项的预设时间值对应表项的存活时间, 当表项新建, 或接收到重复表项 (更 新) 时, 这个值设置为初始值。 之后, 若一直未接收到该表项的重复表项, 且该表项存在时间超出预设值, 则认为该表项老化, 进而删除。 所述时间值 应大于所述 LISP MN进行通信对端信息上 4艮的时间间隔。
进一步地, LISP MN上报的对端信息中可能存在表项与 MS当前维护的 MS-MN-对端表中的表项重复, 因此 MS在将上报信息填入 MS-MN-对端表 前, 需要比较是否有重复表项。 若有重复表项, 则将 MS-MN-对端表中该表 项的有效时间重置为初始值; 若表项不重复, 则在 MS-MN-对端表中建立新 的表项, 填入新上报的信息。
进一步地,若 MS发现下附的 LISP MN离线或关机,则 MS删除 LISP MN 注册的映射信息, 同时删除为所述 LISP MN维护的 MS-MN-对端表。
步骤 307、 MS向 LISP MN返回通信对端信息接收响应报文;
现有技术中, MS接收到 LISP MN发送的映射注册报文后, 可返回通知 才艮文进行确认。 本实施例中, 可扩展该 4艮文用于通信对端信息接收响应。
可选地, 也可釆用其他 文作为响应 4艮文, 实现上述响应功能即可。 步骤 308、 LISP MN映射信息发生变化后, 立刻向 MS发送映射注册才艮 文;
步骤 309、 MS接收到 LISP MN新的映射信息后, 更新本地记录的映射 信息;
步骤 310、 MS根据本地维护的所述 LISP MN对应的 MS-MN-对端表中 的信息, 向对端映射緩存设备发送对端映射更新报文, 报文中携带 LISP MN 新的映射信息;
步骤 311a与 311b为可选步骤, 对端映射緩存设备接收到 MS的映射更 新报文后,可选择向映射平面发起映射请求报文, 来获取 LISP MN的映射信 息, 以保证信息正确性。
步骤 312、 对端映射緩存设备更新緩存的 LISP MN的映射信息; 值得说明的是, 若当前对端映射緩存设备中无所述 LISP MN映射信息, 接收到 MS发送的映射更新报文后, 对端映射緩存设备可选择不将所述映射 信息添加到緩存中, 而是在需要进行数据包转发时重新查找。
步骤 313、 对端映射緩存设备向 MS响应对端映射更新确认报文; 值得说明的是,若对端映射緩存设备当前没有緩存所述 LISP MN的映射 信息,且接收到更新报文后未添加所述 LISP MN的映射信息,在响应更新确 认报文时, 可选择向 MS指明当前不是所述 LISP MN的对端映射緩存设备, 要求 MS移除 MS-MN-对端表中的对应表项。
步骤 314、 MS根据接收到的映射更新确认报文的内容, 执行相关操作, 如删除 MS-MN-对端表中的一些对端信息表项。
实施例二
如图 4所示,是本发明更新 MN映射信息的方法实施例二的信令流程图, 本实施例适用于 LISP MN实时更新对应 MS上的通信对端的相关信息。如图 4所示, 具体包括以下步骤:
步骤 401-403同步骤 301-303;
步骤 404、 LISP MN接收到 LISP封装的数据包后,从数据包中提取通信 对端的相关信息;
LISP MN可保存多个通信对端的信息, 继而构成一个由 LISP MN建立 并维护的对端信息表, 称为 MN-对端表;
进一步地, LISP MN提取相关信息后 ,与 MN-对端表中的表项进行比较。 若表项中无提取的信息, 则 MN在表中建立新表项添加所述信息。
进一步地, 本实施例中 , LISP MN本地维护的 MN-对端表中的表项可设 置预定时间间隔, 若在预定时间间隔内未收到该表项对应的 MN的通信对端 节点发送的数据包, 则可删除对端表中的对应表项。
步骤 405、当 LISP MN维护的 MN-对端表中需要添加或删除表项时, LISP MN将所述添加或删除的表项信息上报到对应的 MS, 并指明对所述表项的 操作;
步骤 406、 MS为每个注册的 LISP MN建立并维护一个通信对端表, 称 为 MS-MN-对端表, MS可根据 LISP MN的身份标识查找到其对应的 MS-MN- 对端表;
MS接收到所述 LISP MN上报的信息后, 根据上报报文中的操作, 执行 MS-MN-对端表中表项的添加或删除;
进一步地,若 MS发现下附的 LISP MN离线或关机,则 MS删除 LISP MN 注册的映射信息, 同时删除为所述 LISP MN维护的 MS-MN-对端表。 步骤 407-414与步骤 307-314相同。
实施例三
如图 5所示,是本发明更新 MN映射信息的方法实施例三的信令流程图, 本实施例适用于 LISP MN映射信息改变时向对应的 MS上 ^艮通信对端的相关 信息。 如图 5所示, 具体包括以下步骤:
步骤 501-504同步骤 301-304;
步骤 505、 LISP MN的映射信息发生变化; 通常是 LISP MN的位置标识 发生了变化, 如 LISP MN位置切换, 获取了新的位置标识;
步骤 506、 LISP MN向对应的 MS发送映射注册 4艮文, 更新映射信息。 LISP MN可在该报文中携带 MN-对端表中的通信对端信息;
可选地, LISP MN映射信息发生变化时, 也可釆用其他 文上 通信对 端信息, 实现所述信息上报的功能即可。
步骤 507、 MS接收到 LISP MN的映射注册报文后, 更新本地保存的映 射信息;
步骤 508、 MS 居获取的通信对端的相关信息, 向 LISP MN的通信对 端发送对端映射更新报文, 报文中携带 LISP MN新的映射信息;
步骤 509-511与步骤 311-313相同;
步骤 512、 MS接收到所有通信对端的更新响应后, 可向 LISP MN发送 更新完成响应。
基于上述方法, 移动节点将对端映射緩存设备的信息上报对应的映射服 务器, 映射服务器管理移动节点的通信对端的信息, 且在移动节点注册的映 射信息发生变化时, 及时通知对端映射緩存设备更新緩存的映射信息, 减少 了移动节点进行对端通知所需要承担的大量的信令开销, 减轻了移动节点的 负担。
如图 6所示, 是本发明 MS实施例的结构示意图, 该 MS包括接收模块
61和触发更新模块 62, 其中:
该接收模块, 用于接收所述 MS下附的 MN发送的更新映射信息的映射 注册 4艮文;
该触发更新模块, 用于获得通信对端的信息, 并根据所述通信对端的信 息向所述 MN的通信对端节点对应的对端映射緩存设备发送映射更新报文, 触发所述对端映射緩存设备更新緩存的映射信息。
其中, 所述通信对端可以包括所述对端映射緩存设备; 所述通信对端的 信息可以包括所述对端映射緩存设备的位置标识信息; 当然, 该通信对端还 可以包括通信对端节点。
另外, 所述 MS还包括建立维护模块 63 , 其中: 所述接收模块, 还用于 接收所述 MN上报的所述通信对端的信息; 所述建立维护模块, 用于建立并 维护保存所述通信对端的信息的通信对端表; 所述触发更新模块, 是用于从 所述通信对端表中获得所述通信对端的信息; 该 MS触发更新的流程可参见 图 3和图 4。 所述触发更新模块, 是用于从所述映射注册报文中获得所述通 信对端的信息, 该 MS触发更新的流程可参见图 5。
具体地, 所述建立维护模块, 是用于为所述通信对端表中的每个表项预 设一个时间值, 并在所述表项的存在时间超过所述时间值时, 删除该表项; 其中, 所述时间值大于所述通信对端的信息上 的时间间隔。
另外, 所述建立维护模块, 还用于将接收到的当前通信对端的信息与所 述通信对端表中的表项进行比较, 若不存在重复的表项, 则在所述通信对端 表中建立新的表项, 并在所述新的表项中写入所述当前通信对端的信息; 若 存在重复的表项, 则将所述时间值重置为初始值。
进一步地, 所述建立维护模块, 还用于发现所述 MN离线或关机, 则删 除所述 MN注册的映射信息, 同时删除为所述 MN维护的所述通信对端表。
该 MS在 MN注册的映射信息发生变化时, 及时通知对端映射緩存设备 更新緩存的映射信息, 减少了移动节点进行对端通知所需要承担的大量的信 令开销, 减轻了移动节点的负担。
如图 7所示, 是本发明 MN实施例的结构示意图, 该 MN包括提取模块 71和上报模块 72, 其中: 提取模块, 用于接收所述 MN的通信对端节点发 送的数据包后, 从所述数据包中提取出通信对端的信息; 上报模块, 用于向 所述 MN对应的映射服务器 (MS )上报所述通信对端的信息。
其中, 所述通信对端包括所述 MN的通信对端节点对应的对端映射緩存 设备; 所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
具体地, 所述上报模块, 是用于定时或实时向所述 MS上报所述通信对 端的信息; 或者, 在映射信息发生变化后, 向所述 MS上报所述通信对端的 信息。
上述 MN将通信对端的信息上报给对应的映射服务器, 从而使得 MS在 MN注册的映射信息发生变化时, 及时通知对端映射緩存设备更新緩存的映 射信息, 减少了移动节点进行对端通知所需要承担的大量的信令开销, 减轻 了移动节点的负担。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 上述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
以上实施例仅用以说明本发明的技术方案而非限制, 仅仅参照较佳实施 例对本发明进行了详细说明。 本领域的普通技术人员应当理解, 可以对本发 明的技术方案进行修改或者等同替换, 而不脱离本发明技术方案的精神和范 围, 均应涵盖在本发明的权利要求范围当中。
工业实用性
上述触发更新移动节点映射信息的方法, 在移动节点映射信息变化时, 由移动节点对应的映射服务器发起对端映射緩存设备的映射信息更新, 较好 地克服了由移动节点去更新对端緩存所需要承担的大量信令开销的问题。

Claims

权 利 要 求 书
1、 一种触发更新移动节点 (MN )映射信息的方法, 应用于位置与身份 分离协议(LISP ) 网络中, 该方法包括:
映射服务器(MS )接收所述 MS下附的 MN发送的更新映射信息的映射 注册 ^艮文;
所述 MS获得通信对端的信息, 并才艮据所述通信对端的信息向所述 MN 的通信对端节点对应的对端映射緩存设备发送映射更新报文, 触发所述对端 映射緩存设备更新緩存的映射信息。
2、 根据权利要求 1所述的方法, 其中,
所述通信对端包括所述对端映射緩存设备;
所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
3、 根据权利要求 2所述的方法, 其中,
所述 MS接收所述 MS下附的 MN发送的更新映射信息的映射注册报文 之前, 所述方法还包括:
所述 MS接收所述 MN上报的所述通信对端的信息;
所述 MS建立并维护保存所述通信对端的信息的通信对端表;
所述 MS获得通信对端的信息包括:
所述 MS从所述通信对端表中获得所述通信对端的信息。
4、 根据权利要求 2所述的方法, 其中,
所述 MS获得通信对端的信息包括:
所述 MS从所述映射注册报文中获得所述通信对端的信息。
5、 根据权利要求 3所述的方法, 其中,
所述 MS维护保存所述通信对端的信息的通信对端表, 包括:
所述 MS为所述通信对端表中的每个表项预设一个时间值, 并在所述表 项的存在时间超过所述时间值时, 删除该表项; 其中, 所述时间值大于所述 通信对端的信息上报的时间间隔。
6、 根据权利要求 5所述的方法, 其中,
所述 MS维护保存所述通信对端的信息的通信对端表, 还包括: 所述 MS将接收到的当前通信对端的信息与所述通信对端表中的表项进 行比较, 若不存在重复的表项, 则在所述通信对端表中建立新的表项, 并在 所述新的表项中写入所述当前通信对端的信息; 若存在重复的表项, 则将所 述时间值重置为初始值。
7、 根据权利要求 5或 6所述的方法, 其中,
所述 MS维护保存所述通信对端的信息的通信对端表, 还包括: 所述 MS发现所述 MN离线或关机, 则删除所述 MN注册的映射信息, 同时删除为所述 MN维护的所述通信对端表。
8、 一种信息上报方法, 应用于位置与身份分离协议(LISP ) 网络中, 该方法包括:
移动节点 (MN )接收所述 MN的通信对端节点发送的数据包后, 从所 述数据包中提取出通信对端的信息;
所述 MN向所述 MN对应的映射服务器 ( MS )上报所述通信对端的信 息。
9、 根据权利要求 8所述的方法, 其中,
所述通信对端包括所述 MN的通信对端节点对应的对端映射緩存设备; 所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
10、 根据权利要求 8或 9所述的方法, 其中,
所述 MN从所述数据包中提取出通信对端的信息之后 ,所述方法还包括: 所述 MN将所述通信对端的信息与已建立的对端信息表中的表项进行比 较, 若所述表项中没有所述通信对端的信息, 则在所述对端信息表中建立新 表项, 并将所述通信对端的信息添加到所述新表项中。
11、 根据权利要求 10所述的方法, 其中,
所述 MN向所述 MS上"¾所述通信对端的信息包括:
所述 MN定时向所述 MS上 ^所述通信对端的信息; 或者 所述 MN在映射信息发生变化后,向所述 MS上报所述通信对端的信息。
12、 根据权利要求 10所述的方法, 其中,
所述 MN向所述 MS上"¾所述通信对端的信息包括:
所述 MN实时向所述 MS上 ^所述通信对端的信息。
13、 根据权利要求 12所述的方法, 其中, 所述方法还包括:
所述 MN为所述对端信息表中的表项设置预定时间间隔, 若在所述预定 时间间隔内未收到当前表项对应的所述 MN的通信对端节点发送的数据包, 则删除所述当前表项。
14、 一种映射服务器(MS ) , 应用于位置与身份分离协议(LISP )网络 中, 该 MS包括:
接收模块, 设置为: 接收所述 MS下附的 MN发送的更新映射信息的映 射注册报文;
触发更新模块, 设置为: 获得通信对端的信息, 并根据所述通信对端的 信息向所述 MN的通信对端节点对应的对端映射緩存设备发送映射更新报文 , 触发所述对端映射緩存设备更新緩存的映射信息。
15、 根据权利要求 14所述的 MS, 其中,
所述通信对端包括所述对端映射緩存设备;
所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
16、根据权利要求 15所述的 MS,其中,所述 MS还包括建立维护模块; 所述接收模块, 还设置为: 接收所述 MN上报的所述通信对端的信息; 所述建立维护模块, 设置为: 建立并维护保存所述通信对端的信息的通 信对端表;
所述触发更新模块, 是设置为: 从所述通信对端表中获得所述通信对端 的信息。
17、 根据权利要求 15所述的 MS, 其中,
所述触发更新模块, 是设置为: 从所述映射注册报文中获得所述通信对 端的信息。
18、 根据权利要求 16所述的 MS, 其中,
所述建立维护模块, 是设置为: 为所述通信对端表中的每个表项预设一 个时间值,并在所述表项的存在时间超过所述时间值时,删除该表项;其中, 所述时间值大于所述通信对端的信息上 的时间间隔。
19、 根据权利要求 18所述的 MS, 其中,
所述建立维护模块, 还设置为: 将接收到的当前通信对端的信息与所述 通信对端表中的表项进行比较, 若不存在重复的表项, 则在所述通信对端表 中建立新的表项, 并在所述新的表项中写入所述当前通信对端的信息; 若存 在重复的表项, 则将所述时间值重置为初始值。
20、 根据权利要求 18或 19所述的 MS, 其中,
所述建立维护模块, 还设置为: 发现所述 MN离线或关机, 则删除所述 MN注册的映射信息, 同时删除为所述 MN维护的所述通信对端表。
21、 一种移动节点 (MN ) , 应用于位置与身份分离协议(LISP ) 网络 中, 该 MN包括:
提取模块, 设置为: 接收所述 MN的通信对端节点发送的数据包后, 从 所述数据包中提取出通信对端的信息;
上报模块, 设置为: 向所述 MN对应的映射服务器(MS )上报所述通 信对端的信息。
22、 根据权利要求 21所述的 MN, 其中,
所述通信对端包括所述 MN的通信对端节点对应的对端映射緩存设备; 所述通信对端的信息包括所述对端映射緩存设备的位置标识信息。
23、 根据权利要求 21或 22所述的 MN, 其中,
所述上 模块, 是设置为: 定时或实时向所述 MS上 "^所述通信对端的 信息;或者,在映射信息发生变化后,向所述 MS上报所述通信对端的信息。
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