WO2013044691A1 - 基于lisp的映射请求响应、信息获取方法及相应设备 - Google Patents

基于lisp的映射请求响应、信息获取方法及相应设备 Download PDF

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Publication number
WO2013044691A1
WO2013044691A1 PCT/CN2012/079810 CN2012079810W WO2013044691A1 WO 2013044691 A1 WO2013044691 A1 WO 2013044691A1 CN 2012079810 W CN2012079810 W CN 2012079810W WO 2013044691 A1 WO2013044691 A1 WO 2013044691A1
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Prior art keywords
mapping
response
information
message
itr
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PCT/CN2012/079810
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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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Publication of WO2013044691A1 publication Critical patent/WO2013044691A1/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
    • 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
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/50Address allocation
    • H04L61/5084Providing for device mobility

Definitions

  • the present invention relates to the field of mobile communications and the Internet, and more particularly to a mapping request response, information acquisition method, and corresponding device in a location and identity separation network.
  • the LISP (Locator Identifier Split Protocol) technology is a solution based on the separation of the host identity and the host location identifier. As shown in Figure la, the implementation is as follows:
  • the site network (usually referred to as the user network) is separated from the transport network (usually the carrier network), and the address space is divided into EID (Endpoint Identifier, endpoint identifier, which represents the address within the site network) address space and RLOC (Routing Locator).
  • EID Endpoint Identifier
  • RLOC Ring Locator
  • the location identifier which represents the reachability within the border router network address space.
  • the routing information of the intra-network in the network that is, the EID address information, is not advertised to the transport network.
  • the two-site network is connected to the Egress Tunnel Router (ETR) and the Egress Tunnel Router (ETR). Establish a tunnel through the transport network to connect.
  • the site network maintains the mapping information of EID to RLOC through a separate mapping system.
  • the producer of the data packet in the site network forwards the data packet to the ITR, and the ITR initiates a mapping request to the mapping system to obtain a mapping relationship between the destination EID and the destination site RLOC.
  • the ITR caches the mapping information, and LISP encapsulates the data packet according to the mapping information, and sends the data packet to the ETR. After the ETR performs packet decapsulation, it forwards the packet to the packet receiver in the downstream destination site.
  • an ALT (Alternative Topology) mapping system is used as an example for mapping planes.
  • MR map resolver
  • MS map server
  • the MR receives the mapping request message of the LISP encapsulation sent by the ITR, and sends the packet to the corresponding MS according to the EID prefix (prefix) routing information in the mapping network.
  • the MS stores the mapping information of the ETR registration, and forwards the received mapping message to the corresponding ETR.
  • LISP technology for mobility.
  • each MN Mobile Node
  • the MN can perform some functions of ETR and ITR.
  • the MN device includes two identifiers: one is the identity of the MN, and the identifier does not change normally; the other is the location identifier of the MN, and when the MN moves to the new location, the identifier can be dynamically obtained, as shown in FIG. Scenes.
  • the identity of the MN is represented by the EID of the MN, abbreviated as MEID.
  • MEID EID of the MN
  • SEID EID in the site address space
  • the ITR firstly initiates a mapping request to the mapping system, and obtains a mapping relationship between the MEID of the MN and the SEID through the MS corresponding to the MN. If there is no mapping entry for the SEID in the ITR buffer, the mapping system is also used to find the mapping of the SEID to the RLOC (abbreviated as ERLOC) of the corresponding ETR. Based on these two parts of mapping information, the ITR performs two layers of LISP encapsulation on the data packet and then forwards it.
  • ERLOC abbreviated as RLOC
  • the ITR router needs to complete two mapping information lookups in order to obtain all mapping information required for establishing communication with the MN. .
  • the embodiments of the present invention provide a LISP-based mapping request response method, an information acquiring method, and a corresponding device, which can reduce message transmission and save network resources.
  • an embodiment of the present invention provides a mapping request response method based on a location and identity separation protocol, including:
  • the mapping server receives the first mapping request message that is sent by the ingress tunnel router (ITR) and carries the mobile node endpoint identifier (MEID), and searches the local database for the first mapping information of the MEID to the location identifier and the corresponding a proxy mapping response flag bit (P bit) value;
  • the MS determines whether the location identifier is a site endpoint identifier (SEID) maintained by the MS, and if so, searches for a second mapping of the SEID to an egress tunnel router routing location identifier (ERLOC) in the local database. Information and corresponding second P bit value; As found, the MS continues the mapping response processing flow of the first mapping information and the second mapping information according to the first mapping information and the first P bit value and the second mapping information and the second P bit value.
  • SEID site endpoint identifier
  • ERPC egress tunnel router routing location identifier
  • the step of the MS continuing the mapping response processing flow of the first mapping information and the second mapping information includes:
  • the first Pit value and the second P bit value respectively indicate that the MS can proxy the mapping response, and the MS encapsulates the first mapping information and the second mapping information in a mapping response message and returns the ITR.
  • the step of the MS continuing the mapping response processing flow of the first mapping information and the second mapping information includes:
  • the first P bit value indicates that the MS can proxy the mapping response
  • the second P bit value represents
  • the MS may not proxy the mapping response, and the MS returns a first mapping response packet carrying the first mapping information to the ITR, and sends the encapsulated second mapping request packet to the egress queue router (ETR) corresponding to the ERLOC. Requesting the ETR to return a second mapping response carrying the second mapping information to the ITR;
  • ETR egress queue router
  • the first mapping response file, the second mapping response file, and the second mapping request message each carry a number indicating that the number of mapping response packets is 2.
  • the step of the MS continuing the mapping response processing flow of the first mapping information and the second mapping information includes:
  • the MS If the first P bit value indicates that the MS cannot proxy the mapping response, and the second P bit value indicates that the MS can proxy the mapping response, the MS returns a second mapping response message carrying the second mapping information to the ITR. Sending, to the mobile node (MN), the encapsulated third mapping request message, requesting the MN to return a first mapping response message carrying the first mapping information to the ITR;
  • the first mapping response text, the second mapping response text, and the third mapping request message each carry a number indicating that the number of mapping response packets is 2.
  • the step of the MS continuing the mapping response processing flow of the first mapping information and the second mapping information includes:
  • the MS sends the encapsulated second mapping request message to the ETR corresponding to the ERLOC, requesting the ETR.
  • a second mapping response message carrying the second mapping information, where the MS further sends the encapsulated third mapping request message to the MN, requesting the MN to return the first mapping information to the ITR.
  • the first mapping response packet, the second mapping response packet, the second mapping request packet, and the third mapping request packet all carry a number indicating that the mapping response packet number is 2.
  • the embodiment of the present invention further provides a mapping information acquiring method based on a location and identity separation protocol, including:
  • An Ingress Tunnel Router sends a mapping request message carrying a Mobile Node Endpoint Identifier (MEID) to the mapping system, requesting to find mapping information corresponding to the MEID;
  • MEID Mobile Node Endpoint Identifier
  • the ITR After receiving the first mapping response message corresponding to the mapping request message, the ITR determines that the first mapping response message does not have a number indicating that the number of response packets is two, and then determines that the received message is received. To all mapping information, the end.
  • the method further includes: after the ITR receives the first mapping response message corresponding to the mapping request, if it is determined that the number of indication response packets in the first mapping response message is two a timer is started, and the timing of the timer is equal to the allowed mapping request delay time. If the ITR does not receive another mapping response corresponding to the mapping request in the timing, the ITR is A mapping request is sent to the mapping system again.
  • An embodiment of the present invention further provides a mapping server based on a location and identity separation protocol, including:
  • a message receiving unit configured to receive a first mapping request message that is sent by an ingress tunnel router (ITR) and carries a mobile node endpoint identifier (MEID);
  • ITR ingress tunnel router
  • MEID mobile node endpoint identifier
  • the information search unit is configured to: search the first mapping information of the MEID to the location identifier and the corresponding first proxy mapping response flag bit (P bit) value in the local database, and if found, determine whether the location identifier is a site endpoint identifier (SEID) maintained by the mapping server (MS), if yes, looking up the second mapping information of the SEID to the egress tunnel router routing location identifier (ERLOC) and the corresponding second P bit value in the local database; as well as
  • a response processing unit configured to: continue the first mapping information and the first mapping information and the first P bit value and the second mapping information and the second P bit value that are found by the information searching unit The mapping of the two mapping information responds to the processing flow.
  • the response processing unit is configured to continue the mapping response processing flow of the first mapping information and the second mapping information by: the first Pit value and the second P bit value searched by the information searching unit respectively indicate that the MS can
  • the proxy mapping response encapsulates the first mapping information and the second mapping information in a mapping response message and returns the information to the ITR.
  • the response processing unit is a mapping response processing procedure configured to continue the first mapping information and the second mapping information by: the first P bit value indicating that the MS can proxy mapping response, the second P bit The value representation MS does not proxy the mapping response, and returns a first mapping response carrying the first mapping information to the ITR, and sends the encapsulated second mapping request message to the egress queue router (ETR) corresponding to the ERLOC.
  • ETR egress queue router
  • the response processing unit is a mapping response processing procedure configured to continue the first mapping information and the second mapping information by: the first P bit value indicating that the MS cannot proxy mapping response, and the second The P bit value indicates that the MS can proxy the mapping response, and then returns a second mapping response message carrying the second mapping information to the ITR, and sends the encapsulated third mapping request message to the mobile node (MN); Both the mapping response packet and the third mapping request packet carry a number indicating that the number of mapping response packets is 2.
  • the response processing unit is configured to continue the mapping response processing flow of the first mapping information and the second mapping information by: the first P bit value and the second P bit value respectively indicating that the MS cannot proxy mapping
  • the second mapping request packet is sent to the ETR corresponding to the ERLOC
  • the encapsulated third mapping request packet is sent to the MN, where the second mapping request packet and the third mapping request packet are both
  • the number of tags indicating that the number of mapping response packets is 2 is carried.
  • An embodiment of the present invention further provides an ingress tunnel router (ITR) based on a location and identity separation protocol, including:
  • a message sending unit configured to send a mobile node endpoint identifier to the mapping system
  • mapping request ⁇ requesting to find mapping information corresponding to the MEID
  • the message receiving and processing unit is configured to: after receiving the first mapping response message corresponding to the mapping request message, if the number of the indication response message does not exist in the first mapping response message is If the number of 2s is marked, it is judged that the ITR has received all the mapping information.
  • the message receiving and processing unit is further configured to: after receiving the first mapping response message corresponding to the mapping request message, if the number of indication response messages in the first mapping response message is 2 If the number is marked, a timer is started, and if another mapping response message corresponding to the mapping request message is not received, the message sending unit is notified to the mapping system again.
  • Send mapping request "3 ⁇ 4 text;
  • the message sending unit is further configured to, after receiving the notification by the message receiving and processing unit, send a mapping request message to the mapping system again.
  • the above solution improves the mapping information acquisition process and enhances the MS function, which can reduce the transmission of mapping request messages, avoid waste of network resources, and reduce the impact on packet forwarding.
  • Figure la is the network architecture diagram of the relevant LISP+ALT
  • Figure lb is a schematic diagram of a scenario in which the MN obtains a SEID as a location identifier in the network of Figure la;
  • FIG. 2a is a flowchart of a mapping request response method according to Embodiment 1 of the present invention.
  • FIG. 2b is a flowchart of a method for acquiring mapping information according to Embodiment 1 of the present invention
  • FIG. 2c is a functional block diagram of an MS according to Embodiment 1 of the present invention.
  • FIG. 2d is a functional block diagram of an ITR according to Embodiment 1 of the present invention.
  • FIG. 3 is a flowchart of obtaining mapping information in a proxy mode according to Embodiment 2 of the present invention
  • FIG. 4 and FIG. 5 are flowcharts respectively showing obtaining mapping information in two cases of a semi-proxy mode according to Embodiment 3 of the present invention
  • FIG. 6 is a flowchart of obtaining mapping information in the agentless mode according to Embodiment 4 of the present invention.
  • the ETR corresponding to the site EID needs to register the mapping information of the site EID to the ERLOC to the mapping system.
  • the entity that responds to the mapping request can be set by setting the state of the P bit (roxy-map-reply bit) in the registration message. If the P bit is 0, the MS forwards the mapping request message to the ETR. If the P bit is 1, the MS can act as a proxy for the ETR to respond to the ITR response mapping request.
  • the MN performs the ETR function, moves to the new location, and after acquiring the new SEID, it needs to register the mapping information of the MEID to the SEID to the mapping system.
  • the entity that responds to the mapping request can also be set by setting the state of the P bit in the registration message. If the P bit is 0, the MS forwards the mapping request message to the MN; if the P bit is 1, the MS can respond to the ITR response mapping request as the proxy of the MN.
  • the registration scenario can be divided into the following three types:
  • Scenario 2 Semi-proxy mode. If the P bit in the registration message sent by the MN is set to 1, the P bit in the registration message sent by the ETR is set to 0; or, the P bit in the registration message sent by the MN is set to 0, and the P bit in the registration message sent by the ETR is set to 1 , the mode is called semi-agent mode.
  • Scenario 3 Agentless mode. If the P bit is set to 0 in the registration message sent by the MN and the ETR, the mode is called agentless mode.
  • This embodiment relates to a process flow of response processing of a mapping request by an MS and a process of acquiring mapping information by an ITR.
  • the response processing process of the MS to the mapping request includes:
  • Step 201 The MS receives the first mapping request message carrying the MEID sent by the ITR, and the local The database searches for the first mapping information of the MEID to the location identifier and the corresponding first P bit value.
  • Step 203 The MS is configured according to the first mapping information, the first P bit value, and the second mapping information, and the second
  • the search result of the P bit value continues the mapping response processing flow of the two mapping information.
  • step 203 further includes:
  • the MS finds the first mapping information and the first P bit value and the second mapping information and the second P bit value, and the first P bit value and the second P bit value both indicate that the MS can proxy the mapping response, the MS sends the MEID
  • the mapping information to the SEID and the mapping information of the SEID to the ERLOC are encapsulated in a mapping response message and returned to the ITR;
  • the MS finds the first mapping information and the first P bit value indicating that the MS can proxy the mapping response, and the second mapping information and the second P bit value indicating that the MS cannot proxy the mapping response; then the MS returns to the ITR to carry the first The first mapping response message of the mapping information, and sending the encapsulated second mapping request message to the egress queue router (ETR) corresponding to the ERLOC, requesting the ETR to return a second mapping response message carrying the second mapping information to the ITR;
  • ETR egress queue router
  • the MS finds the first mapping information and the first P bit value indicating that the MS cannot proxy the mapping response, and the second mapping information and the second P bit value indicating that the MS can proxy the mapping response; then the MS returns to the ITR to carry the second The second mapping response message of the mapping information, and sending the encapsulated third mapping request message to the MN, requesting the MN to return a first mapping response message carrying the first mapping information to the ITR;
  • the MS finds the first mapping information and the first P bit value indicating that the MS cannot proxy the mapping response, and the second mapping information and the second P bit value indicating that the MS cannot proxy the mapping response; then the MS corresponds to the ERLOC
  • the ETR sends the encapsulated second mapping request message, and the ETR returns the second mapping response message carrying the second mapping information to the ITR.
  • the MS also sends the encapsulated third mapping request message to the MN, requesting the MN to return to the ITR. a first mapping response message of the mapping information; wherein all mapping response messages and mapping request messages sent by the MS carry a number flag indicating that the number of mapping response packets is 2.
  • the ITR obtains the mapping information, including:
  • Step 250 The ITR sends a mapping request message carrying the MEID to the mapping system, and requests to find mapping information corresponding to the MEID.
  • Step 251 After receiving the first mapping response packet corresponding to the mapping request packet, the ITR determines whether the number of the number of the response response packets in the first mapping response packet is two, if not, Indicates that the ITR has received all mapping information, and ends; if yes, step 252 is performed;
  • Step 252 the ITR starts a timer, and the timing of the timer is equal to the allowed mapping response delay time;
  • Step 253 the ITR in the timing of the timer as received the mapping request > 3 ⁇ 4 text corresponding to another mapping response, the end, otherwise step 254;
  • Step 254 The ITR sends a mapping request message to the mapping system again.
  • the re-mapping request message may be the same as the mapping request message sent for the first time.
  • the SEID may be carried in the re-sent mapping request, that is, only the mapping information corresponding to the SEID is searched for.
  • the MS based on LISP in this embodiment includes:
  • a message receiving unit 11 configured to receive a first mapping request message carrying an MEID sent by the ITR;
  • the information search unit 12 is configured to: search the first mapping information of the MEID to the location identifier and the corresponding first P bit value in the local database, and if found, determine whether the found location identifier is the SEID maintained by the MS, If yes, the second mapping information of the SEID to the ERLOC and the corresponding second P bit value are searched in the local database;
  • the response processing unit 13 is configured to continue the mapping response processing flow of the two mapping information according to the first mapping information and the first P bit value and the search result of the second mapping information and the second P bit value.
  • the response processing unit continues the mapping response processing flow of the two mapping information. Please refer to the description of step 203 above, and the description is not repeated here.
  • the ITR based on LISP in this embodiment includes:
  • the message sending unit 21 is configured to: send a mapping request message carrying a mobile node endpoint identifier (MEID) to the mapping system, request to search for mapping information corresponding to the MEID, and receive the message receiving and processing unit After the notification, the mapping request message is sent to the mapping system again.
  • MEID mobile node endpoint identifier
  • the message receiving and processing unit 22 is configured to: after receiving the first mapping response message corresponding to the mapping request message, determine whether the number of indication response messages in the first mapping response message is two The number of tags, if not present, indicates that all mapping information has been received, and ends; if present, a timer is started, and another mapping corresponding to the mapping request is received within the timing time of the timer. The response message is terminated, otherwise, the message sending unit is notified to send the mapping request message to the mapping system again. The mapping request message sent again is as described above.
  • This embodiment relates to the acquisition of mapping information in the proxy mode.
  • the process of obtaining mapping information is shown in Figure 3.
  • the information acquisition steps are as follows:
  • the MN registers the newly acquired mapping relationship between the SEID and the MEID, and the P bit in the registration message is set to 1, indicating that the MS can proxy the MN response mapping request; the MS saves the mapping information of the SEID to the MEID and the corresponding P bit value. ;
  • the ITR sends a mapping request to the mapping system to search for the mapping information corresponding to the MEID.
  • the mapping information registration process and the mapping request in the mapping system in the mapping system may be based on the existing process in the mapping system. No longer elaborated.
  • the MS corresponding to the MN finds the mapping information of the MEID to the location identifier and the corresponding P bit value according to the MEID in the packet, and determines whether the SEID is found. It is the SEID maintained by the MS. If yes, the MS searches the local database for the mapping information of the SEID to the ERLOC and the corresponding P bit.
  • the discussion of the MS holds the mapping information of the MEID to the SEID and the mapping information of the SEID to the ERLOC.
  • the MS does not find the mapping information or check
  • the MS can be processed according to the existing process, and will not be discussed here, and other embodiments are the same.
  • the method for obtaining the mapping information in this embodiment solves the problem of reducing the number of sending control packets and avoiding waste of network resources in the scenario where the P bit of the registration message sent by the MN and the ETR is 1 in the related art.
  • the problem of packet forwarding delay due to mapping lookups is reduced as much as possible.
  • This embodiment relates to the acquisition of mapping information in a semi-proxy mode.
  • the semi-proxy mode includes two cases: The first one: the P bit in the registration message sent by the ETR is set to 0, the P bit in the registration message sent by the MN is set to 1; the second type is the registration in the ETR. Bit is set to 1, and the P bit in the registration message sent by the MN is set to 0.
  • the mapping information acquisition process for the two cases corresponds to Figure 4 and Figure 5, respectively.
  • the mapping information acquisition process includes:
  • the ETR registers the mapping information with the MS, and the mapping information includes the mapping of the SEID to the ERLOC, and the P bit in the registration message is set to 0, indicating that the MS cannot proxy the ETR response mapping request; the MS saves the mapping information of the SEID to the ERLOC and Corresponding P bit value;
  • the MN registers a newly acquired mapping relationship between the SEID and the MEID, and the P bit in the registration message is set to 1, indicating that the MS can proxy the MN response mapping request; the MS saves the mapping information of the SEID to the MEID and the corresponding P bit value. ;
  • the ITR sends a mapping request to the mapping system to search for the mapping information corresponding to the MEID.
  • the MS corresponding to the MN After receiving the mapping request packet, the MS corresponding to the MN, according to the MEID in the packet, finds the mapping information of the MEID to the location identifier and the corresponding P bit value in the local database, and determines whether the SEID found is Is the SEID maintained by this MS. If yes, MS checks in the local database. Find the mapping information of the SEID to ERLOC and the corresponding P bit.
  • mapping response message If the MS finds the mapping information of the SEID to the ERLOC in the local database, and the P bit corresponding to the mapping information is 0, the MS sends the encapsulated mapping request message to the ETR, and requests the ETR to return the information carrying the SEID to the ERLOC to the ITR. Mapping response message;
  • the source address of the above-mentioned encapsulated mapping request message is the RLOC of the ITR (abbreviated as IRLOC), and the destination address is SEID, and the mapping information corresponding to the SEID is requested from the ETR.
  • the MS may add two tags to the message, the number tag indicates the number of mapping response messages that the ITR should receive (the number is 2), and the sequence number flag indicates that the MS is the mapping response.
  • the sequence number information assigned to the ⁇ is 0, 1
  • the MS allocates different sequence numbers for mapping response packets carrying different mapping information.
  • the MS finds the mapping information of the MEID to the SEID in the local database, and the P bit corresponding to the mapping information is 1, the MS returns a mapping response message to the ITR, and carries the mapping information of the MEID to the SEID;
  • the MS may add a number tag and a sequence number tag in the returned mapping response message, and the meaning of the two tags is the same as the tag in the mapping request message sent by the MS to the ETR, except that the sequence number is different.
  • mapping response message 407 After the first mapping response message received by the ITR, according to the number tag and the sequence number tag, if the mapping response message is not received, a timer is started;
  • the ITR first receives the mapping response message returned by the MS in step 406, which includes the mapping information of the MEID to the SEID. After the ITR receives, it is judged that the mapping response message is not received, and a timer is started. In another case, the timer is also started if the ITR first receives a mapping response message containing the SEID to ERLOC mapping information returned by the ETR.
  • the ETR returns a mapping response message to the ITR, carries the mapping information of the SEID to the ERLOC, and the number tag and the sequence number tag in the mapping request message in step 405.
  • mapping response sequence of the above steps 407 and 408 can be changed.
  • the above embodiment may also have a variant in which only the number of tags is retained, and the sequence tag is not used.
  • the ITR can judge according to the number of tags and the number of received mapping response messages. All the mapping responses are received.
  • Other embodiments are the same.
  • the mapping information acquisition process includes:
  • the MN registers the newly acquired mapping relationship between the SEID and the MEID to the MS, and the P bit in the registration message is set to 0, indicating that the MS cannot proxy the MN response mapping request; the MS saves the mapping information of the SEID to the MEID and the corresponding P bit.
  • the ITR sends a mapping request to the mapping system, and searches for mapping information corresponding to the MEID.
  • the MS corresponding to the MN After receiving the mapping request message, the MS corresponding to the MN searches for the mapping information of the MEID to the SEID in the packet and the corresponding P bit value in the local database, and determines whether the found SEID is maintained by the MS. SEID, if yes, the MS searches the local database for the mapping information of the SEID to the ERLOC and the corresponding P bit;
  • mapping response message of information If the MS finds the mapping information of the MEID to the SEID in the local database, and the P bit corresponding to the mapping information is 0, the MS sends the encapsulated mapping request message to the MN, requesting the MN to return the carrying MEID to the SEID mapping to the ITR. Mapping response message of information;
  • the source address of the mapping request packet of the above encapsulation is IRLOC, and the destination address is MEID. Number and serial number tags can be added to the message, meaning the same as the first case.
  • the MS finds the mapping information of the SEID to the ERLOC in the local database, and the P bit corresponding to the mapping information is 1, the MS returns a mapping response message to the ITR, and carries the mapping information of the SEID to the ERLOC.
  • the number and the serial number mark can be added to the mapping response message returned by the MS to the ITR.
  • steps 505, 506 is in no particular order.
  • the number and the number of labels added here have the same effect as described in Case 1.
  • mapping response message received by the ITR After the first mapping response message received by the ITR, determining, according to the number tag and the sequence number tag, that the mapping response message is not received, starting a timer; This step can refer to the description in step 407.
  • the MN returns a mapping response message to the ITR, carrying the mapping information of the SEID to the MEID, and the number tag and the sequence number tag in the mapping request message in step 405;
  • mapping response message receiving sequence of steps 506 and 508 can be changed.
  • the method for obtaining the mapping information in the embodiment solves the problem of how to reduce the number of sending control packets and avoid waste of network resources in a scenario where the P bit is 1 in the registration message sent by the MN and the ETR. And as much as possible, the problem of packet forwarding delay caused by mapping lookup is reduced.
  • Embodiment 4 In the agentless mode
  • the ETR registers the mapping information with the MS, and the mapping information includes the mapping of the SEID to the ERLOC, and the P bit in the registration message is set to 0, indicating that the MS cannot proxy the ETR response mapping request; the MS saves the mapping information of the SEID to the ERLOC and Corresponding P bit value;
  • the MN registers the newly acquired SEID-to-MEID mapping relationship with the MS, and the P bit in the registration message is set to 0, indicating that the MS cannot proxy the MN response mapping request; the MS saves the mapping information of the SEID to the MEID and the corresponding P bit.
  • the ITR sends a mapping request to the mapping system to search for the mapping information corresponding to the MEID.
  • the MS corresponding to the MN After receiving the mapping request packet, the MS corresponding to the MN searches for the MEID according to the MEID in the packet, for example, in the local database. The mapping information of the location identifier and the corresponding P bit value, and then determining whether the SEID found is the SEID maintained by the MS. If yes, the MS searches the local database for the mapping information of the SEID to the ERLOC and the corresponding P bit;
  • mapping response message of information If the MS finds the mapping information of the SEID to the ERLOC in the local database, and the P bit corresponding to the mapping information is 0, the MS sends the encapsulated mapping request to the ETR, requesting the ETR to return the carrying the SEID to the ERLOC mapping to the ITR. Mapping response message of information;
  • the source address of the mapping request packet of the above encapsulation is IRLOC, and the destination address is SEID.
  • a number mark and a serial number mark may be added to the message, and the meaning is the same as that of the second embodiment.
  • 606 If the MS finds the mapping information of the SEID to the MEID in the local database, and the P bit corresponding to the mapping information is 0, the MS sends the encapsulated mapping request message to the MN, requesting the MN to return the MEID to the SEID mapping information to the ITR. Mapping response message;
  • the source address of the above-mentioned encapsulated request message is IRLOC, and the destination address is MEID.
  • the number of tags and sequence numbers can also be added to the message.
  • the ETR returns a mapping response message to the ITR, carrying the mapping information of the SEID to the ERLOC, and the number tag and the sequence number tag in the mapping request message in step 605;
  • mapping response message After the first mapping response message received by the ITR, determining, according to the number tag and the sequence number tag, that the mapping response message is not received, starting a timer;
  • This step can refer to the description in step 407.
  • the MN returns a mapping response message to the ITR, carrying the mapping information of the MEID to the SEID, and the number tag and the sequence number tag in the mapping request message of step 606.
  • steps 605 and 606 are in no particular order, and the order of receiving the mapping response messages in steps 607 and 609 can be changed.
  • the functions of the number mark and the serial number mark in this embodiment are the same as those in the second embodiment.
  • the method for obtaining the mapping information in the embodiment solves the problem of reducing the number of sending control packets and avoiding waste of network resources in the scenario where the P bit of the registration message sent by the MN and the ETR is 0 in the related art.
  • the problem of packet forwarding delay due to mapping lookups is reduced as much as possible.
  • the embodiments of the present invention are not limited to the ALT mapping system, but can be applied to other mapping systems.
  • the ITR may only obtain one mapping request message, that is, it may acquire the mapping information of the MEID to the SEID and the SEID to the EROLC. Based on the mapping information acquisition method, the number of transmission control messages can be reduced, network resources are wasted, and packet forwarding delay caused by mapping search is reduced as much as possible.
  • the embodiment of the present invention improves the mapping information acquisition process and enhances the MS function, which can reduce the transmission of mapping request packets, avoid waste of network resources, and reduce the impact on packet forwarding.

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Abstract

一种基于LISP的映射请求响应、信息获取方法及相应设备,MS收到ITR发送的携带MEID的第一映射请求报文,在本地数据库查找该MEID到位置标识的第一映射信息和对应的第一Pbit值;如查找到,判断该位置标识是否本MS维护的SEID,如是,在本地数据库中查找该SEID到ERLOC的第二映射信息及对应的第二Pbit值;MS根据查找结果继续该两个映射信息的映射响应处理流程。相应地,ITR向映射系统发送携带MEID的映射请求报文后,接收到该映射请求报文对应的第一个映射响应报文时,如判断该第一个映射响应报文中不存在指示响应报文数为2个的数目标记,则表示所述ITR已接收到所有映射信息,结束。该方法可以减少报文发送、节约网络资源。

Description

基于 LISP的映射请求响应、 信息获取方法及相应设备
技术领域
本发明涉及移动通讯领域和互联网领域, 更具体地, 涉及一种在位置与 身份分离网络中的映射请求响应、 信息获取方法及相应设备。
背景技术
LISP ( Locator Identifier Split Protocol, 位置与身份分离协议)技术是一 种基于主机身份标识与主机位置标识分离的解决方案, 如图 la所示, 其实现 方式如下:
站点网络(通常指用户网络)与传送网络(通常指运营商网络)分离, 将地址空间划分为 EID ( Endpoint Identifier , 端点标识符, 表示站点网络内的 地址)地址空间与 RLOC ( Routing Locator, 路由位置标识符, 表示边界路由 器网络内的可达性)地址空间。 网络中的站点在网络内部的路由信息, 即 EID 地址信息, 不发布到传送网络中, 两个站点网络通过 ITR ( Ingress Tunnel Router, 入口隧道路由器)和 ETR ( Egress Tunnel Router, 出口隧道路由器) 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。
需要进行数据转发时, 站点网络中数据包的生成方将数据包转发给 ITR, ITR向映射系统发起映射请求, 获取目的 EID与目的站点 RLOC间的映射关 系。 ITR緩存映射信息, 并根据映射信息对数据包进行 LISP封装, 将数据包 发送给 ETR。 ETR执行数据包解封装后, 将数据包转发给下行目的站点中的 数据包接收方。
图 1所示, 以 ALT ( Alternative Topology )映射系统为例进行映射平面说 明, 映射系统中使用了 MR ( map resolver, 映射解析器)和 MS ( map server, 映射服务器)。 MR接收 ITR发送的 LISP封装的映射请求报文, 并根据映射 网络中的 EID prefix (前缀)路由信息, 将报文发送给对应的 MS。 MS存储 ETR注册的映射信息, 并将接收到的映射报文转发给对应的 ETR。 相关技术 中同样涉及 LISP技术对移动性的支持。 在 LISP移动性研究中, 每个 MN ( Mobile Node,移动节点 )均可看作一个 LISP站点 , MN可执行 ETR和 ITR 的部分功能。 MN设备上包括两个标识: 一个是 MN的身份标识, 该标识通 常不会发生变化; 另一个为 MN的位置标识, MN移动到新位置时, 可动态 获取该标识, 如图 lb所示的场景。 MN的身份标识用 MN的 EID表示, 简写 为 MEID。 当 MN移动到一个 LISP站点中时, 获取到的位置标识是站点地址 空间中的一个 EID , 用站点的 EID表示 , 简写为 SEID。 MN获取新的 SEID 后, 立刻将 MEID到 SEID的映射关系注册到对应的映射系统中。
相关技术中, 若出现这种情况, ITR在查找 MN的映射信息时, 首先向 映射系统发起映射请求, 通过 MN对应的 MS , 获取该 MN的 MEID到 SEID 的映射关系。 若 ITR緩存中无该 SEID的映射项, 则还需通过映射系统, 查 找获取该 SEID到对应 ETR的 RLOC (简写为 ERLOC )的映射。 ITR根据这 两部分映射信息, 对数据包进行两层 LISP封装后再转发。
发明人在实现本发明的过程中,发现相关技术至少存在以下问题: 当 MN 在新位置获取 SEID时, ITR路由器需要完成两次映射信息查找, 才能够获取 与 MN建立通信所需要的全部映射信息。
发明内容
本发明实施方式提供一种可以减少报文发送和节约网络资源的基于 LISP 的映射请求响应方法、 信息获取方法及相应设备。
为了解决上述问题, 本发明实施方式提供了一种基于位置与身份分离协 议的映射请求响应方法, 包括:
映射服务器 (MS)收到入口隧道路由器 (ITR)发送的携带移动节点端点标 识符 (MEID)的第一映射请求报文, 在本地数据库查找该 MEID到位置标识的 第一映射信息和对应的第一代理映射响应标志位 (P bit)值;
如查找到, 所述 MS判断所述位置标识是否是本 MS维护的站点端点标 识符 (SEID),如是, 在本地数据库中查找该 SEID到出口隧道路由器路由位置 标识符 (ERLOC)的第二映射信息及对应的第二 P bit值; 以及 如查找到, 所述 MS根据第一映射信息和第一 P bit值及第二映射信息和 第二 P bit值, 继续所述第一映射信息和第二映射信息的映射响应处理流程。
所述 MS继续所述第一映射信息和第二映射信息的映射响应处理流程的 步骤包括:
如所述第一 Pit值和第二 P bit值均表示 MS可以代理映射响应,所述 MS 将所述第一映射信息及第二映射信息封装在一个映射响应报文中返回给所述 ITR。
所述 MS继续所述第一映射信息和第二映射信息的映射响应处理流程的 步骤包括:
如所述第一 P bit值表示 MS可以代理映射响应,且所述第二 P bit值表示
MS不可以代理映射响应, 所述 MS向所述 ITR返回携带第一映射信息的第 一映射响应报文, 并向该 ERLOC对应的出口隧道路由器 (ETR)发送封装的第 二映射请求报文,请求所述 ETR向所述 ITR返回携带第二映射信息的第二映 射响应 4艮文;
其中, 所述第一映射响应 文、 第二映射响应 文和第二映射请求 "^文 中均携带表示映射响应报文数为 2的数目标记。
所述 MS继续所述第一映射信息和第二映射信息的映射响应处理流程的 步骤包括:
如所述第一 P bit值表示 MS不可以代理映射响应,且所述第二 P bit值表 示 MS可以代理映射响应, 所述 MS向所述 ITR返回携带第二映射信息的第 二映射响应报文, 并向移动节点(MN )发送封装的第三映射请求报文, 请求 所述 MN向所述 ITR返回携带第一映射信息的第一映射响应报文;
其中, 所述第一映射响应 文、 第二映射响应 文和第三映射请求 "^文 中均携带表示映射响应报文数为 2的数目标记。
所述 MS继续所述第一映射信息和第二映射信息的映射响应处理流程的 步骤包括:
如所述第一 P bit值和第二 P bit值均表示 MS不可以代理映射响应,所述 MS向该 ERLOC对应的 ETR发送封装的第二映射请求报文, 请求所述 ETR 向所述 ITR返回携带第二映射信息的第二映射响应报文; 所述 MS还向 MN 发送封装的第三映射请求报文, 请求所述 MN向所述 ITR返回携带第一映射 信息的第一映射响应报文;
其中, 所述第一映射响应报文、 第二映射响应报文、 第二映射请求报文 和第三映射请求报文中均携带表示映射响应报文数为 2的数目标记。
本发明实施方式还提供一种基于位置与身份分离协议的映射信息获取方 法, 包括:
入口隧道路由器 (ITR)向映射系统发送携带移动节点端点标识符 (MEID) 的映射请求 文, 请求查找该 MEID对应的映射信息; 以及
所述 ITR接收到该映射请求报文对应的第一个映射响应报文后, 如发现 该第一个映射响应报文中不存在指示响应报文数为 2个的数目标记, 则判断 已接收到所有映射信息, 结束。
该方法还包括: 所述 ITR接收到该映射请求 ^艮文对应的第一个映射响应 报文后, 如判断该第一个映射响应报文中存在指示响应报文数为 2个的数目 标记, 则启动一定时器, 该定时器的定时时间等于允许的映射请求延迟时间, 所述 ITR在该定时时间内如没有收到该映射请求 ^艮文对应的另一映射响应才艮 文, 则再次向所述映射系统发送映射请求"¾文。
本发明实施方式还提供一种基于位置与身份分离协议的映射服务器, 包 括:
报文接收单元, 其设置为接收入口隧道路由器 (ITR)发送的携带移动节点 端点标识符 (MEID)的第一映射请求报文;
信息查找单元, 其设置为: 在本地数据库查找该 MEID到位置标识的第 一映射信息和对应的第一代理映射响应标志位 (P bit)值, 如查找到, 判断所述 位置标识是否是所述映射服务器(MS )维护的站点端点标识符 (SEID),如是, 在本地数据库中查找该 SEID到出口隧道路由器路由位置标识符 (ERLOC)的 第二映射信息及对应的第二 P bit值; 以及
响应处理单元, 其设置为: 根据所述信息查找单元查找到的第一映射信 息和第一 P bit值及第二映射信息和第二 P bit值,继续所述第一映射信息和第 二映射信息的映射响应处理流程。
所述响应处理单元是设置为通过如下方式继续所述第一映射信息和第二 映射信息的映射响应处理流程: 如信息查找单元查找到的第一 Pit值和第二 P bit值均表示 MS可以代理映射响应, 则将所述第一映射信息及第二映射信息 封装在一个映射响应报文中返回给所述 ITR。
所述响应处理单元是设置为通过如下方式继续所述第一映射信息和第二 映射信息的映射响应处理流程: 如所述第一 P bit值表示 MS可以代理映射响 应, 所述第二 P bit值表述 MS不可以代理映射响应, 则向所述 ITR返回携带 第一映射信息的第一映射响应"¾文, 并向该 ERLOC对应的出口隧道路由器 (ETR)发送封装的第二映射请求报文;所述第一映射响应报文和第二映射请求 报文中均携带表示映射响应报文数为 2的数目标记。
所述响应处理单元是设置为通过如下方式继续所述第一映射信息和第二 映射信息的映射响应处理流程: 如所述第一 P bit值表示 MS不可以代理映射 响应, 且所述第二 P bit值表示 MS可以代理映射响应, 则向所述 ITR返回携 带第二映射信息的第二映射响应报文, 并向移动节点(MN )发送封装的第三 映射请求报文; 所述第二映射响应报文和第三映射请求报文中均携带表示映 射响应报文数为 2的数目标记。
所述响应处理单元是设置为通过如下方式继续所述第一映射信息和第二 映射信息的映射响应处理流程: 如所述第一 P bit值和第二 P bit值均表示 MS 不可以代理映射响应, 则向该 ERLOC对应的 ETR发送封装的第二映射请求 报文, 向 MN发送封装的第三映射请求报文; 其中, 所述第二映射请求报文 和第三映射请求报文中均携带表示映射响应报文数为 2的数目标记。
本发明实施方式还提供一种基于位置与身份分离协议的入口隧道路由器 (ITR), 包括:
报文发送单元, 其设置为向映射系统发送携带移动节点端点标识符
(MEID)的映射请求 ^艮文 , 请求查找该 MEID对应的映射信息; 以及
报文接收及处理单元, 其设置为在接收到该映射请求报文对应的第一个 映射响应报文后, 如发现该第一个映射响应报文中不存在指示响应报文数为 2个的数目标记, 则判断所述 ITR已接收到所有映射信息。
所述报文接收及处理单元还设置为: 接收到该映射请求报文对应的第一 个映射响应报文后, 如发现该第一个映射响应报文中存在指示响应报文数为 2 个的数目标记, 则启动一定时器, 在该定时器的定时时间内如果没有收到 该映射请求报文对应的另一映射响应报文, 则通知所述报文发送单元再次向 所述映射系统发送映射请求"¾文;
所述报文发送单元还设置为在收到所述报文接收及处理单元的所述通知 后, 再次向所述映射系统发送映射请求报文。
上述方案通过改进映射信息获取流程, 增强 MS功能, 可以减少映射请 求报文的发送, 避免网络资源浪费, 减小对数据包转发的影响。
附图概述
图 la是相关的 LISP+ALT的网络架构图;
图 lb是在图 la的网络中, MN获取 SEID作为位置标识的场景的示意 图;
图 2a是本发明实施例一的映射请求响应方法的流程图;
图 2b是本发明实施例一的映射信息获取方法的流程图;
图 2c是本发明实施例一的 MS的功能模块图;
图 2d是本发明实施例一的 ITR的功能模块图;
图 3 是本发明实施例二在代理模式下获取映射信息的流程图; 图 4 和图 5分别是本发明实施例三在半代理模式的两种情况下获取映射 信息的流程图;
图 6 是本发明实施例四在无代理模式下获取映射信息的流程图。
本发明的较佳实施方式 下文中将结合附图对本发明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。
在图 la所示的 LISP架构中, 需要关注两个映射注册报文:
站点 EID对应的 ETR需要向映射系统注册站点 EID到 ERLOC的映射信 息。 ETR向映射系统中的 MS注册映射信息时, 可以通过在注册报文中设置 P bit ( roxy-map-reply bit: 代理映射响应标志位) 的状态, 来设定响应映射 请求的实体。 若 P bit为 0, 则 MS将映射请求报文转发给 ETR; 若 P bit为 1 , 则 MS可作为 ETR的代理向 ITR响应映射请求。
MN执行 ETR功能, 移动到新的位置, 获取了新的 SEID后, 需要向映 射系统注册 MEID到 SEID的映射信息。 MN向映射系统中的 MS注册映射信 息时,也可以通过在注册报文中设置 P bit的状态来设定响应映射请求的实体。 若 P bit为 0, 则 MS将映射请求报文转发给 MN; 若 P bit为 1 , 则 MS可作 为 MN的代理向 ITR响应映射请求。
本发明实施方式中, 根据上述两个注册报文中 P bit的不同设置, 可将注 册场景分为以下三种:
场景一: 代理模式。 若 MN与 ETR发送的注册报文中, P bit均置为 1 , 则称该模式为代理模式。
场景二: 半代理模式。 若 MN发送的注册报文中 P bit置 1 , ETR发送的 注册 4艮文中 P bit置 0; 或者, MN发送的注册 4艮文中 P bit置 0, ETR发送的 注册报文中 P bit置 1 , 则称该模式为半代理模式。
场景三: 无代理模式。若 MN与 ETR发送的注册报文中, P bit均置为 0, 则该模式称为无代理模式。
实施例一
本实施例涉及 MS对映射请求的响应处理流程和 ITR获取映射信息的流 程。
如图 2a所示, MS对映射请求的响应处理流程, 包括:
步骤 201 , MS收到 ITR发送的携带 MEID的第一映射请求 4艮文,在本地 数据库查找该 MEID到位置标识的第一映射信息和对应的第一 P bit值; 步骤 202, 如查找到, MS判断查找到的该位置标识是否本 MS 维护的 SEID,如是,在本地数据库中查找该 SEID到 ERLOC的第二映射信息及对应 的第二 P bit值;
步骤 203 , MS根据第一映射信息和第一 P bit值及第二映射信息和第二
P bit值的查找结果, 继续该两个映射信息的映射响应处理流程。
其中, 步骤 203又包括:
如 MS查找到第一映射信息和第一 P bit值及第二映射信息和第二 P bit 值, 且第一 P bit值和第二 P bit值均表示 MS可以代理映射响应, MS将该 MEID到 SEID的映射信息及该 SEID到 ERLOC的映射信息封装在一个映射 响应报文中返回给 ITR;
如 MS查找到第一映射信息和表示 MS可以代理映射响应的第一 P bit值, 以及第二映射信息和表示 MS不可以代理映射响应的第二 P bit值; 则 MS向 ITR返回携带第一映射信息的第一映射响应报文,并向该 ERLOC对应的出口 隧道路由器 (ETR)发送封装的第二映射请求报文, 请求 ETR向 ITR返回携带 第二映射信息的第二映射响应报文;
如 MS查找到第一映射信息和表示 MS不可以代理映射响应的第一 P bit 值, 以及第二映射信息和表示 MS可以代理映射响应的第二 P bit值; 则 MS 向 ITR返回携带第二映射信息的第二映射响应报文, 并向 MN发送封装的第 三映射请求报文, 请求 MN向 ITR返回携带第一映射信息的第一映射响应报 文;
如 MS查找到第一映射信息和表示 MS不可以代理映射响应的第一 P bit 值, 以及第二映射信息和表示 MS 不可以代理映射响应的第二 P bit值; 则 MS向该 ERLOC对应的 ETR发送封装的第二映射请求报文 ,请求 ETR向 ITR 返回携带第二映射信息的第二映射响应报文; MS还向 MN发送封装的第三 映射请求报文,请求 MN向 ITR返回携带第一映射信息的第一映射响应报文; 其中, 上述 MS发送的所有映射响应报文和映射请求报文中均携带表示 映射响应报文数为 2的数目标记。 如图 2b所示, ITR获取映射信息的流程, 包括:
步骤 250, ITR向映射系统发送携带 MEID的映射请求报文,请求查找该 MEID对应的映射信息;
步骤 251 , ITR接收到该映射请求报文对应的第一个映射响应报文后,判 断该第一个映射响应报文中是否存在指示响应报文数为 2个的数目标记, 如 不存在,表示所述 ITR已接收到所有映射信息,结束;如存在,执行步骤 252;
步骤 252, ITR启动一定时器,该定时器的定时时间等于允许的映射响应 延迟时间;
步骤 253 , ITR在该定时器的定时时间内如收到该映射请求>¾文对应的另 一映射响应 4艮文, 结束, 否则执行步骤 254;
步骤 254 , ITR再次向所述映射系统发送映射请求报文。
该再次映射请求报文可以同第一次发送的映射请求报文。 在接收到的第 一个映射响应 ^艮文中携带 MEID到 SEID的映射信息时, 也可以在再次发送 的映射请求 文中携带该 SEID, 即只查找该 SEID对应的映射信息。
相应的, 如图 2c所示, 本实施例基于 LISP的 MS包括:
报文接收单元 11 , 其设置为接收 ITR发送的携带 MEID的第一映射请求 报文;
信息查找单元 12, 其设置为: 在本地数据库查找该 MEID到位置标识的 第一映射信息和对应的第一 P bit值, 如查找到, 判断查找到的该位置标识是 否本 MS维护的 SEID, 如是, 在本地数据库中查找该 SEID到 ERLOC的第 二映射信息及对应的第二 P bit值; 以及
响应处理单元 13 ,其设置为根据第一映射信息和第一 P bit值及第二映射 信息和第二 P bit值的查找结果, 继续该两个映射信息的映射响应处理流程。
所述响应处理单元继续该两个映射信息的映射响应处理流程, 请参照上 文步骤 203的说明, 在此不再重复。
相应的, 如图 2d所示, 本实施例基于 LISP的 ITR包括: 报文发送单元 21 , 其设置为: 向映射系统发送携带移动节点端点标识符 (MEID)的映射请求报文 , 请求查找该 MEID对应的映射信息 , 以及在收到报 文接收及处理单元的所述通知后, 再次向所述映射系统发送映射请求报文。
报文接收及处理单元 22, 其设置为在接收到该映射请求报文对应的第一 个映射响应报文后, 判断该第一个映射响应报文中是否存在指示响应报文数 为 2个的数目标记, 如不存在, 则表示已接收到所有映射信息, 结束; 如存 在, 则启动一定时器, 在该定时器的定时时间内如收到该映射请求"¾文对应 的另一映射响应报文, 结束, 否则, 通知所述报文发送单元再次向所述映射 系统发送映射请求报文。 再次发送的映射请求报文如上文的说明。
实施例二
本实施例涉及代理模式下映射信息的获取。 映射信息获取的流程如图 3 所示, 信息获取步骤如下:
301 : ETR向 MS注册映射信息, 映射信息中包含 SEID到 ERLOC的映 射, 且注册报文中的 P bit置 1 , 表示 MS可代理 ETR响应映射请求; MS保 存该 SEID到 ERLOC的映射信息及对应的 P bit值;
302: MN向 MS注册新获取的 SEID到 MEID的映射关系 , 注册 4艮文中 的 P bit置 1 , 表示 MS可代理 MN响应映射请求; MS保存该 SEID到 MEID 的映射信息及对应的 P bit值;
303: ITR向映射系统发送映射请求才艮文, 查找 MEID对应的映射信息; 步骤 301-303 中的映射信息注册过程及映射请求在映射系统内基于 MR 的转发处理过程可以基于现有流程, 文中不再详细阐述。
304: MN对应的 MS接收到映射请求报文后, 根据报文中的 MEID , 如 在本地数据库查找到该 MEID到位置标识的映射信息和对应的 P bit值, 再判 断查找到的该 SEID是否是本 MS维护的 SEID, 如是, MS在本地数据库查 找该 SEID到 ERLOC的映射信息及对应的 P bit。
需要说明的是, 文中讨论的是 MS保存有 MEID到 SEID的映射信息及 SEID到 ERLOC的映射信息的情况。 对于 MS查找不到所述映射信息或者查 找到的是 MEID到 ERLOC的映射信息的情况 , MS可以按现有流程处理 , 在 此不再讨论, 其他实施例同此。
305: 若 MS在本地数据库中查找到 MEID到 SEID的映射信息及 SEID 到 ERLOC的映射信息,且该两个映射信息对应的 P bit均为 1 ,则 MS将 MEID 到 SEID的映射信息及 SEID到 ERLOC的映射信息封装在一个映射响应报文 中返回给 ITR。
本实施例的映射信息获取方法, 解决了相关技术中存在的在 MN与 ETR 发送的注册报文中 P bit均为 1的场景下, 如何减少发送控制报文的数目, 避 免网络资源浪费, 并尽可能地减小了由于映射查找所造成的数据包转发延迟 的问题。
实施例三
本实施例涉及半代理模式下映射信息的获取。半代理模式包括两种情况: 第一种: ETR发送的注册 ^艮文中的 P bit置 0 , MN发送的注册 4艮文中的 P bit 置 1; 第二种, ETR发送的注册 ^艮文中 P bit置 1 , MN发送的注册 4艮文中 P bit 置 0。 两种情况的映射信息获取流程分别对应图 4和图 5。
在第一种情况, ETR不允许 MS代理映射响应 , MN允许 MS代理映射 响应时, 如图 4所示, 映射信息的获取流程包括:
401 : ETR向 MS注册映射信息, 映射信息中包含 SEID到 ERLOC的映 射, 且注册报文中的 P bit置 0, 表示 MS不可以代理 ETR响应映射请求; MS保存该 SEID到 ERLOC的映射信息及对应的 P bit值;
402: MN向 MS注册新获取的 SEID到 MEID的映射关系 , 注册 4艮文中 的 P bit置 1 , 表示 MS可代理 MN响应映射请求; MS保存该 SEID到 MEID 的映射信息及对应的 P bit值;
403: ITR向映射系统发送映射请求才艮文, 查找 MEID对应的映射信息;
404: MN对应的 MS接收到映射请求报文后 , 根据报文中的 MEID , 如 在本地数据库查找到该 MEID到位置标识的映射信息和对应的 P bit值, 再判 断查找到的该 SEID是否是本 MS维护的 SEID, 如是, MS在本地数据库查 找该 SEID到 ERLOC的映射信息及对应的 P bit。
405: 若 MS在本地数据库中查找到 SEID到 ERLOC的映射信息且该映 射信息对应的 P bit为 0, 则 MS向 ETR发送封装的映射请求报文, 请求 ETR 向 ITR返回携带 SEID到 ERLOC映射信息的映射响应报文;
上述封装的映射请求报文的源地址为 ITR的 RLOC (简写为 IRLOC ) , 目的地址为 SEID , 向 ETR请求 SEID对应的映射信息。 MS可以在报文中添 加两个标记,数目标记指示 ITR应接收到的映射响应报文的数目(数目为 2 ) , 序号标记指示 MS为映射响应 "^文分配的序号信息如为 0,1 , MS为携带不同 映射信息的映射响应报文分配不同的序号。
406: 若 MS在本地数据库中查找到 MEID到 SEID的映射信息且该映射 信息对应的 P bit为 1 , 则 MS向 ITR返回映射响应报文,携带 MEID到 SEID 的映射信息;
同样, MS可以在返回的映射响应报文中添加数目标记和序号标记 , 该 2 个标记的含义同 MS向 ETR发送的映射请求报文中的标记, 只是序号不同。
上述步骤 405 , 406的执行顺序不分先后。
407: ITR收到的第一个映射响应报文后, 根据其中的数目标记和序号标 记判断还有映射响应报文没有收到, 则启动一定时器;
假定 ITR先收到步骤 406中 MS返回的映射响应报文, 其中包含 MEID 到 SEID的映射信息。 ITR收到后, 判断还有映射响应报文没有收到, 则启动 一定时器。在另一情况下,如果 ITR先收到 ETR返回的包含 SEID到 ERLOC 映射信息的映射响应报文, 也启动该定时器。
408: ETR向 ITR返回映射响应报文,携带 SEID到 ERLOC的映射信息, 以及步骤 405中映射请求报文中的数目标记和序号标记。
ITR在上述定时器的定时时间内接收或没有接收到另一映射响应报文时 的处理请参照上文步骤 254中的说明, 其他实施例同此, 不再重复。
上述步骤 407与 408的映射响应 文接收顺序可调换。
以上实施例还可以有一个变例, 在该变例中只保留数目标记, 不使用序 号标记, ITR根据该数目标记及记录的已收到映射响应报文的数目就可以判 断收到所有的映射响应 ^艮文。 其他实施方式同此。
在第二种情况, ETR允许 MS代理映射响应, MN不允许 MS代理映射 响应时, 如图 5所示, 映射信息的获取流程包括:
501 : ETR向 MS注册映射信息, 映射信息中包含 SEID到 ERLOC的映 射, 且注册报文中的 P bit置 1 , 表示 MS可以代理 ETR响应映射请求; MS 保存该 SEID到 ERLOC的映射信息及对应的 P bit值;
502: MN向 MS注册新获取的 SEID到 MEID的映射关系 , 注册 4艮文中 的 P bit置 0, 表示 MS不可以代理 MN响应映射请求; MS保存该 SEID到 MEID的映射信息及对应的 P bit值;
503: ITR向映射系统发送映射请求 ^艮文, 查找 MEID对应的映射信息;
504: MN对应的 MS接收到映射请求报文后, 如在本地数据库查找到报 文中的 MEID到 SEID的映射信息和对应的 P bit值,再判断查找到的该 SEID 是否是本 MS维护的 SEID, 如是, MS在本地数据库查找该 SEID到 ERLOC 的映射信息及对应的 P bit;
505: 若 MS在本地数据库中查找到 MEID到 SEID的映射信息且该映射 信息对应的 P bit为 0, 则 MS向 MN发送封装的映射请求 4艮文, 请求 MN向 ITR返回携带 MEID到 SEID映射信息的映射响应报文;
上述封装的映射请求报文的源地址为 IRLOC, 目的地址为 MEID。 报文 中可添加数目标记和序号标记, 含义与第一种情况相同。
506: 若 MS在本地数据库中查找到 SEID到 ERLOC的映射信息且该映 射信息对应的 P bit为 1 , MS向 ITR返回映射响应报文,携带 SEID到 ERLOC 的映射信息;
MS向 ITR返回的映射响应报文中可添加数目标记和序号标记。
步骤 505, 506的执行顺序不分先后。 此处添加的数目标记与序号标记的 作用与情况一中所描述的作用相同。
507: ITR收到的第一个映射响应报文后, 根据其中的数目标记和序号标 记判断还有映射响应报文没有收到, 则启动一定时器; 本步骤可以参照步骤 407中的说明。
508: MN向 ITR返回映射响应报文, 携带 SEID到 MEID的映射信息, 以及步骤 405中映射请求报文中的数目标记和序号标记;
步骤 506与 508的映射响应报文接收顺序可调换。
本实施例的映射信息获取方法, 解决了相关技术中存在的在 MN与 ETR 发送的注册报文中有一个 P bit为 1的场景下,如何减少发送控制报文的数目, 避免网络资源浪费, 并尽可能地减小了由于映射查找所造成的数据包转发延 迟的问题。
实施例四: 无代理模式下
无代理模式下, ETR和 MN均不允许 MS代理映射响应, 映射信息的获 取流程如图 6所示, 包括:
601 : ETR向 MS注册映射信息, 映射信息中包含 SEID到 ERLOC的映 射, 且注册报文中的 P bit置 0, 表示 MS不可以代理 ETR响应映射请求; MS保存该 SEID到 ERLOC的映射信息及对应的 P bit值;
602: MN向 MS注册新获取的 SEID到 MEID的映射关系 , 注册 4艮文中 的 P bit置 0, 表示 MS不可以代理 MN响应映射请求; MS保存该 SEID到 MEID的映射信息及对应的 P bit值;
603: ITR向映射系统发送映射请求才艮文 , 查找 MEID对应的映射信息; 604: MN对应的 MS接收到映射请求报文后, 根据报文中的 MEID , 如 在本地数据库查找到该 MEID到位置标识的映射信息和对应的 P bit值, 再判 断查找到的该 SEID是否是本 MS维护的 SEID, 如是, MS在本地数据库查 找该 SEID到 ERLOC的映射信息及对应的 P bit;
605: 若 MS在本地数据库中查找到 SEID到 ERLOC的映射信息且该映 射信息对应的 P bit为 0, 则 MS向 ETR发送封装的映射请求 4艮文, 请求 ETR 向 ITR返回携带 SEID到 ERLOC映射信息的映射响应报文;
上述封装的映射请求报文的源地址为 IRLOC, 目的地址为 SEID。报文中 可添加数目标记和序号标记 , 含义与实施例二相同。 606: 若 MS在本地数据库中查找到 SEID到 MEID的映射信息且该映射 信息对应的 P bit为 0, MS向 MN发送封装的映射请求 4艮文,请求 MN向 ITR 返回携带 MEID到 SEID映射信息的映射响应报文;
上述封装的请求报文的源地址为 IRLOC, 目的地址为 MEID, 报文中还 可添加数目标记和序号标记。
607: ETR向 ITR返回映射响应报文,携带 SEID到 ERLOC的映射信息, 以及步骤 605的映射请求报文中的数目标记和序号标记;
608: ITR收到的第一个映射响应报文后, 根据其中的数目标记和序号标 记判断还有映射响应报文没有收到, 则启动一定时器;
本步骤可以参照步骤 407中的说明。
609: MN向 ITR返回映射响应报文, 携带 MEID到 SEID的映射信息 , 以及步骤 606的映射请求报文中的数目标记和序号标记。
上述步骤中, 步骤 605与 606的执行顺序不分先后, 步骤 607与 609中 映射响应报文的接收顺序可调换。 本实施例中的数目标记与序号标记的作用 与实施例二中的作用相同。
本实施例的映射信息获取方法, 解决了相关技术中存在的在 MN与 ETR 发送的注册报文中 P bit均为 0的场景下, 如何减少发送控制报文的数目, 避 免网络资源浪费, 并尽可能地减小了由于映射查找所造成的数据包转发延迟 的问题。
虽然以上是基于 LISP+ALT架构进行说明, 但本发明实施方式不限于釆 用 ALT映射系统, 还可应用于其他映射系统。
釆用本发明的上述实施方式, 当 MN在新位置获取的位置标识是 SEID 时, ITR只发送一个映射请求报文即可能获取到 MEID到 SEID及 SEID到 EROLC的两部分映射信息。基于这种映射信息获取方法, 可以减少发送控制 报文的数目, 避免网络资源浪费, 并尽可能地减小了由于映射查找所造成的 数据包转发延迟。
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, 所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。
以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 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。
工业实用性
本发明实施方式通过改进映射信息获取流程, 增强 MS功能, 可以减少 映射请求报文的发送, 避免网络资源浪费, 减小对数据包转发的影响。

Claims

1、 一种基于位置与身份分离协议的映射请求响应方法, 包括: 映射服务器 (MS)收到入口隧道路由器 (ITR)发送的携带移动节点端点标 识符 (MEID)的第一映射请求报文, 在本地数据库查找该 MEID到位置标识的 第一映射信息和对应的第一代理映射响应标志位 (P bit)值;
如查找到, 所述 MS判断所述位置标识是否是本 MS维护的站点端点标 识符 (SEID),如是, 在本地数据库中查找该 SEID到出口隧道路由器路由位置 标识符 (ERLOC)的第二映射信息及对应的第二 P bit值; 以及
如查找到, 所述 MS根据第一映射信息和第一 P bit值及第二映射信息和 第二 P bit值, 继续所述第一映射信息和第二映射信息的映射响应处理流程。
2、 如权利要求 1所述的映射请求响应方法, 其中,
所述 MS继续所述第一映射信息和第二映射信息的映射响应处理流程的 步骤包括:
如所述第一 Pit值和第二 P bit值均表示 MS可以代理映射响应,所述 MS 将所述第一映射信息及第二映射信息封装在一个映射响应报文中返回给所述 ITR。
3、 如权利要求 1所述的映射请求响应方法, 其中,
所述 MS继续所述第一映射信息和第二映射信息的映射响应处理流程的 步骤包括:
如所述第一 P bit值表示 MS可以代理映射响应,且所述第二 P bit值表示
MS不可以代理映射响应, 所述 MS向所述 ITR返回携带第一映射信息的第 一映射响应报文, 并向该 ERLOC对应的出口隧道路由器 (ETR)发送封装的第 二映射请求报文,请求所述 ETR向所述 ITR返回携带第二映射信息的第二映 射响应 4艮文;
其中, 所述第一映射响应 文、 第二映射响应 文和第二映射请求 "^文 中均携带表示映射响应报文数为 2的数目标记。
4、 如权利要求 1所述的映射请求响应方法, 其中, 所述 MS继续所述第一映射信息和第二映射信息的映射响应处理流程的 步骤包括:
如所述第一 P bit值表示 MS不可以代理映射响应,且所述第二 P bit值表 示 MS可以代理映射响应, 所述 MS向所述 ITR返回携带第二映射信息的第 二映射响应报文, 并向移动节点(MN )发送封装的第三映射请求报文, 请求 所述 MN向所述 ITR返回携带第一映射信息的第一映射响应报文;
其中, 所述第一映射响应 文、 第二映射响应 文和第三映射请求 "^文 中均携带表示映射响应报文数为 2的数目标记。
5、 如权利要求 1所述的映射请求响应方法, 其中,
所述 MS继续所述第一映射信息和第二映射信息的映射响应处理流程的 步骤包括:
如所述第一 P bit值和第二 P bit值均表示 MS不可以代理映射响应,所述 MS向该 ERLOC对应的 ETR发送封装的第二映射请求报文, 请求所述 ETR 向所述 ITR返回携带第二映射信息的第二映射响应报文; 所述 MS还向 MN 发送封装的第三映射请求报文, 请求所述 MN向所述 ITR返回携带第一映射 信息的第一映射响应报文;
其中, 所述第一映射响应报文、 第二映射响应报文、 第二映射请求报文 和第三映射请求报文中均携带表示映射响应报文数为 2的数目标记。
6、 一种基于位置与身份分离协议的映射信息获取方法, 包括:
入口隧道路由器 (ITR)向映射系统发送携带移动节点端点标识符 (MEID) 的映射请求 文, 请求查找该 MEID对应的映射信息; 以及
所述 ITR接收到该映射请求报文对应的第一个映射响应报文后, 如发现 该第一个映射响应报文中不存在指示响应报文数为 2个的数目标记, 则判断 已接收到所有映射信息, 结束。
7、 如权利要求 6所述的映射信息获取方法, 还包括:
所述 ITR接收到该映射请求报文对应的第一个映射响应报文后, 如判断 该第一个映射响应报文中存在指示响应报文数为 2个的数目标记, 则启动一 定时器, 该定时器的定时时间等于允许的映射请求延迟时间, 所述 ITR在该 定时时间内如没有收到该映射请求 文对应的另一映射响应>¾文, 则再次向 所述映射系统发送映射请求"¾文。
8、 一种基于位置与身份分离协议的映射服务器, 包括:
报文接收单元, 其设置为接收入口隧道路由器 (ITR)发送的携带移动节点 端点标识符 (MEID)的第一映射请求报文;
信息查找单元, 其设置为: 在本地数据库查找该 MEID到位置标识的第 一映射信息和对应的第一代理映射响应标志位 (P bit)值, 如查找到, 判断所述 位置标识是否是所述映射服务器(MS )维护的站点端点标识符 (SEID),如是, 在本地数据库中查找该 SEID到出口隧道路由器路由位置标识符 (ERLOC)的 第二映射信息及对应的第二 P bit值; 以及
响应处理单元, 其设置为: 根据所述信息查找单元查找到的第一映射信 息和第一 P bit值及第二映射信息和第二 P bit值,继续所述第一映射信息和第 二映射信息的映射响应处理流程。
9、 如权利要求 8所述的映射服务器, 其中,
所述响应处理单元是设置为通过如下方式继续所述第一映射信息和第二 映射信息的映射响应处理流程: 如信息查找单元查找到的第一 Pit值和第二 P bit值均表示 MS可以代理映射响应, 则将所述第一映射信息及第二映射信息 封装在一个映射响应报文中返回给所述 ITR。
10、 如权利要求 8所述的映射服务器, 其中,
所述响应处理单元是设置为通过如下方式继续所述第一映射信息和第二 映射信息的映射响应处理流程: 如所述第一 P bit值表示 MS可以代理映射响 应, 所述第二 P bit值表述 MS不可以代理映射响应, 则向所述 ITR返回携带 第一映射信息的第一映射响应"¾文, 并向该 ERLOC对应的出口隧道路由器 (ETR)发送封装的第二映射请求报文;所述第一映射响应报文和第二映射请求 报文中均携带表示映射响应报文数为 2的数目标记。
11、 如权利要求 8所述的映射服务器, 其中,
所述响应处理单元是设置为通过如下方式继续所述第一映射信息和第二 映射信息的映射响应处理流程: 如所述第一 P bit值表示 MS不可以代理映射 响应, 且所述第二 P bit值表示 MS可以代理映射响应, 则向所述 ITR返回携 带第二映射信息的第二映射响应报文, 并向移动节点(MN )发送封装的第三 映射请求报文; 所述第二映射响应报文和第三映射请求报文中均携带表示映 射响应报文数为 2的数目标记。
12、 如权利要求 8所述的映射服务器, 其中,
所述响应处理单元是设置为通过如下方式继续所述第一映射信息和第二 映射信息的映射响应处理流程: 如所述第一 P bit值和第二 P bit值均表示 MS 不可以代理映射响应, 则向该 ERLOC对应的 ETR发送封装的第二映射请求 报文, 向 MN发送封装的第三映射请求报文; 其中, 所述第二映射请求报文 和第三映射请求报文中均携带表示映射响应报文数为 2的数目标记。
13、 一种基于位置与身份分离协议的入口隧道路由器 (ITR), 包括: 报文发送单元, 其设置为向映射系统发送携带移动节点端点标识符 (MEID)的映射请求 ^艮文 , 请求查找该 MEID对应的映射信息; 以及
报文接收及处理单元, 其设置为在接收到该映射请求报文对应的第一个 映射响应报文后, 如发现该第一个映射响应报文中不存在指示响应报文数为 2个的数目标记, 则判断所述 ITR已接收到所有映射信息。
14、 如权利要求 13所述的入口隧道路由器, 其中,
所述报文接收及处理单元还设置为: 接收到该映射请求报文对应的第一 个映射响应报文后, 如发现该第一个映射响应报文中存在指示响应报文数为 2 个的数目标记, 则启动一定时器, 在该定时器的定时时间内如果没有收到 该映射请求报文对应的另一映射响应报文, 则通知所述报文发送单元再次向 所述映射系统发送映射请求"¾文;
所述报文发送单元还设置为在收到所述报文接收及处理单元的所述通知 后, 再次向所述映射系统发送映射请求报文。
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