WO2013007132A1 - Detaching method, device and map-server - Google Patents

Abstract

A detaching method, applied in a location/ID separation protocol (lisp) network, comprising: a network element with a tunnel router function sends a detaching request carrying end indication information to a map-server, requesting the map-server to delete an end-identifier/routing locator map corresponding to an end indicated by the end indication information. Also disclosed is a corresponding device.

Description

 De-attaching method, device and mapping server

Technical field

 The present invention relates to the field of network technologies, and in particular, to a detaching method, apparatus, and mapping server. Background technique

 The size of the DFZ (Default Free Zone) routing table increases at an increasing rate, which compromises the scalability of the route and the execution of route aggregation. Routing scalability issues have generated great interest in industry and academia.

 Members of the IAB (Internet Architecture Board) discussed that the underlying reason for the increase in the DFZ routing table is the dual semantics of IP addresses. In existing networks, IP addresses are both identifiers and locations. The IRTF RRG (Internet Research Task Force Routing Research Group) is currently working on new routing and address architectures to support multi-hole, traffic engineering and mobility. Lisp (Location/ID Separation Protocol) is a new routing framework based on the requirements of RRG for routing and address research. It separates the current IP address into terminal identifiers (EIDs, End). -identifiers) and routing locations (RLOCs, Routing Locators) to reduce the size of the DFZ routing table, increase the number of extensions and reduce the number of globally visible, routing prefixes.

 The network structure of Lisp is shown in Figure 1. The basic idea of LISP is to encapsulate a layer on the outside of the IP layer.

The IP packet header is used to reduce the impact of routes generated by the increase of edge network users on the routing table of the backbone network and maintain the stability of the backbone network (BGP) routing table. Lisp divides the existing IP address system into terminal identification (EID) and routing location (RLOC), and introduces the concept of tunnel routers ("Tunnel Routers"). The tunnel routers are divided into Ingress Tunnel Routers (ITRs). And Egress Tunnel Router (ETR). Both ITR and ETR need to register the binding of EID and RLOC in the mapping server (Map-Server, MS). For the host on the ETR side, the ETR is responsible for registering the EID of this host and the RLOC. The ITR is responsible for buffering the EID/RLOC binding of the ETR-side host. Similarly for the ITR side host, the ITR registers the binding of the EID of this host to the RLOC. In addition, ISR in Lisp is responsible for data encapsulation and mapping search, according to the purpose EID letter Find the corresponding RLOC information. The ETR in Lisp is responsible for decapsulating data packets.

 The original intention of the LISP protocol is to solve the scale of the routing table, and it cannot solve the mobility of the network. With the development of the network, the mobility of the network is necessary, and the requirements of the Lisp design must be able to solve the mobility and multi-hole.

 lisp-MN (LISP Motion Node, Lis Mobile Node) is a mobility solution for Lisp. Lisp-MN defines the node in the lis network as lisp-MN, lisp-MN is different from ordinary MN (Motion Node -, mobile node), lisp-MN has the function of ETR/ITR, Figure 2 ^ , in Lisp- Schematic diagram of the network structure of the MN. When lisp-MN moves to another network, lisp-MN registers its EID/RLOC mapping with its MS.

Summary of the invention

 The technical problem to be solved by the present invention is to provide a lisp-MN detaching method, device and mapping server, thereby improving system resource utilization.

 In order to solve the above problems, the present invention provides a detaching method for use in an identity and location separation protocol (lisp) network, including:

 The network element having the tunnel router function sends a detach request carrying the terminal indication information to the mapping server, and requests the mapping server to delete the terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information.

 Preferably, the foregoing method may further have the following feature: the terminal indication information is a terminal identifier. Preferably, the terminal indication information is information that identifies the terminal.

 Preferably, the foregoing method may further have the following feature: the network element having the tunnel router function is an identity and location separation protocol mobile node (lisp-MN), or an ingress tunnel router, or an egress tunnel router.

 Preferably, the foregoing method may further have the following feature: the detach request further carries one or more routing locations, and the detach request does not carry a routing location. .

The invention also provides a detaching method, which is applied to a lisp network, and includes: after the mapping server receives the detach request of the carrying terminal indication information sent by the network element having the tunneling router function, deleting the locally stored terminal indication information Terminal ID/routing location corresponding to the indicated terminal Mapping.

 Preferably, the foregoing method may further have the following feature: when the detaching request does not carry a routing location, the mapping server deletes all terminal identifier/routing location mappings corresponding to the terminal indicated by the terminal indication information stored locally.

 Preferably, the foregoing method may further have the following feature: when the detach request carries one or more routing locations, the mapping server deletes the terminal identifier/route location mapping corresponding to the terminal indicated by the locally indicated terminal indication information. The same mapping as the one or more routing locations.

 Preferably, the foregoing method may further have the following feature: the terminal indication information is a terminal identifier. Preferably, the terminal indication information is information that identifies the terminal.

 The present invention also provides a detaching apparatus applied to a network element having a tunnel router function, the apparatus comprising:

 a generating unit, configured to: generate a detach request, where the detach request carries terminal indication information;

 And a sending unit, configured to: send the detach request to the mapping server, and request the mapping server to delete the terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information.

 Preferably, the foregoing apparatus may further have the following feature: the terminal indication information is a terminal identifier. Preferably, the terminal indication information is information that identifies the terminal.

 Preferably, the foregoing apparatus may further have the following feature: the generating unit is further configured to: carry one or more routing locations in the detach request, or do not carry a routing location in the detach request.

 The present invention also provides a mapping server, the mapping server comprising a receiving unit and a deleting unit, wherein:

 The receiving unit is configured to: receive a detach request of the carrying terminal indication information sent by the network element having the tunnel router function, and notify the deleting unit;

 The deleting unit is configured to: after receiving the notification, delete the terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information stored locally.

Preferably, the mapping server may further have the following features, and the deleting unit is further configured to: When the detaching request does not carry the routing location, deleting all terminal identifier/routing location mappings corresponding to the terminal indicated by the terminal indication information stored locally;

 Preferably, the deleting unit is further configured to: when the one or more routing locations are carried in the detaching request, deleting a routing location in a terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information stored locally The same terminal identification/routing location mapping as the one or more routing locations.

 Preferably, the mapping server may further have the following feature: the terminal indication information is a terminal identifier.

 Preferably, the terminal indication information is information that identifies the terminal.

 When the lisp MN/ITR/ETR leaves the network, the embodiment of the present invention releases relevant resources in the original MS in time, thereby improving system resource utilization. BRIEF abstract

 Figure 1 is a schematic diagram of a lisp network structure;

 Figure Schematic diagram of the network structure of lisp-MN;

 Figure 3 is a schematic diagram of the lisp-MN detachment process;

 Figure 4 is a schematic diagram of the lisp detachment process;

 Figure 5 is a schematic diagram of a format of a detach request message;

 Figure 6 is a block diagram of the detachment device;

 Figure 7 is a block diagram of the mapping server.

Preferred embodiment of the invention

 In order to make the objects, the technical solutions and the advantages of the present invention more clearly, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments of the present application may be arbitrarily combined with each other.

After the lisp-MN moves, the original MS still retains its related mapping information, which occupies system resources. The embodiment of the present invention provides a detaching method, which is applied to a lisp network, and performs the following operations on a tunnel router or a network element side having a tunnel router function:

 The network element having the tunnel router function sends a detach request carrying the terminal indication information to the mapping server, and requests the mapping server to delete the terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information.

 The terminal indication information may be an end identifier (EID), or may be other information that can identify the terminal.

 The network element with the tunnel router function is a lisp-MN, or an ingress tunnel router or an egress tunnel router.

 The detach request also carries one or more routing locations. It is also possible not to carry a route location.

 The detachment method provided by the embodiment of the present invention performs the following operations on the mapping server side: after the mapping server receives the detach request of the carrying terminal indication information sent by the network element having the tunnel router function, the mapping server deletes the locally stored terminal indication information. The terminal identifier/route location mapping corresponding to the indicated terminal.

 When the detach request carries one or more routing locations, the mapping server deletes the one or more routes in the terminal identifier/route location mapping corresponding to the terminal indicated by the locally indicated terminal indication information. The same location mapping.

 When the detach request does not carry the routing location, the mapping server deletes all terminal identifier/route location mappings of the terminal indicated by the locally stored terminal indication information.

An embodiment including both sides of the flow is given below.

 When lisp-MN/ITR/ETR does not need to continue to be attached to the network (when the user needs to shut down or the user needs to actively interrupt the network connection and the subscription is restricted), lisp-MN/ITR/ETR initiates the detach process, including:

The lisp-MN/ITR/ETR sends a detach request to the MS, and the detach request carries the terminal identifier, and requests the MS to delete the EID/RLOC mapping corresponding to the terminal identifier stored therein; After receiving the detach request, the MS deletes the locally stored EID/RLOC mapping corresponding to the terminal identifier and sends a detach response to the lisp-MN/ITR/ETR, and the detach process is completed.

Embodiment 1

 The architecture of this embodiment is shown in FIG. 3, including a lisp network, a communication node lisp-MN (lisp-MN has the function of an ETR/ITR network element in the lisp protocol), and a mapping server MS. The mapping server MS is the EID/RLOC mapping in which the lisp-MN is registered. In this embodiment, the detach request is a mapping to the registration request, including:

 Step 301: The lisp-MN sends a Map-Unregister Request (mapped to the registration request, which is equivalent to the aforementioned detach request) to the MS, where the message carries the [isp-MN EID, request to delete the MS storage Elip/RLOC mapping of the lisp-MN;

 Step 302: After receiving the Map-Unregister Request, the MS deletes the locally stored EID/RLOC mapping corresponding to the EID and sends a Map-Unregister Response to the lisp-MN. Or a failure indication). The detachment process is completed.

The above embodiment uses Lisp-MN as an example. The same function can be implemented on the ITR/ETR network element of the LISP protocol to complete the detach process of the user. The ETR is taken as an example for description.

 Embodiment 2

 This embodiment is based on the basic protocol of lisp described in FIG. 1. This embodiment is shown in FIG. 4, and mainly includes the following steps:

 Step 401: The ETR sends a Map-Unregister Request to the MS (the message carries the EID of the MN), and requests the MS to delete the EID/RLOC mapping corresponding to the stored EID.

 Step 402: After receiving the Map-Unregister Request, the MS deletes the locally stored EID/RLOC mapping corresponding to the EID and sends a Map-Unregister Response to the ETR. The message carries an indication indicating that the deletion succeeds or fails. The detachment process is complete.

In the embodiment of the present invention, Map refers to EID/RLOC Mapping (EID/RLOC mapping). The format of the Map-Unregister Request is explained below.

 Define a lisp text type in lisp:

 LISP Map-Unregister: 6 b'0110' The LISP Map-Unregister message type is defined here. 6. This message type can also be any other binary number.

 A Map-Unregister Message Format is defined in lisp, as shown in Figure 5, where: In the format of the text, the Type field has a value of 6, indicating that the message is a Map-Unregister message.

 In addition, the EID-prefix field in the message includes a case where the prefix length is 0, at this time

EID-prefix is the EID, which means that this message includes EID and EID-prefix.

 Since a user's EID may correspond to multiple RLOCs, the user's registration includes two cases. One case is to delete all RLOCs under this EID. In this case, the Map-Unregister Message Format in Figure 7 does not contain the locator field; the other case deletes one or more RLOCs under this EID. In the case, the locator field in the Map-Unregister Message Format in Figure 7 carries one or more RLOCs to be deleted.

As shown in FIG. 6, a block diagram of a detachment apparatus according to an embodiment of the present invention is applied to a network element having a tunnel router function, and the apparatus includes:

 a generating unit, configured to generate a detach request, where the detach request carries the terminal indication information, and the sending unit is configured to send the detach request to the mapping server, and request the mapping server to delete the terminal corresponding to the terminal indication information Terminal identification / routing location mapping.

 The terminal indication information is a terminal identifier.

 The generating unit further carries one or more routing locations in the detach request. The embodiment of the present invention further provides a network element having a tunnel router function including the above detaching apparatus, that is, providing an ITR/ETR/Lisp-MN including the above detaching apparatus.

As shown in FIG. 7, a block diagram of a mapping server according to an embodiment of the present invention includes: a receiving unit And delete units, where:

 The receiving unit is configured to receive a detach request of the carrying terminal indication information sent by the network element having the tunnel router function, and notify the deleting unit;

 The deleting unit is configured to: after receiving the notification, delete the terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information stored locally.

 The deleting unit is further configured to: when the detaching request does not carry the routing location, delete all terminal identifier/routing location mappings corresponding to the terminal indicated by the terminal indication information stored locally;

 Or,

 When the detach request carries one or more routing locations, the routing location in the terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information that is locally stored is the same as the one or more routing locations. Terminal identification / routing location mapping.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

Industrial applicability

 When the lisp MN/ITR/ETR leaves the network, the embodiment of the present invention releases relevant resources in the original MS in time, thereby improving system resource utilization.

Claims

Claim  A detaching method, applied to an identity and location separation protocol (lisp) network, comprising: a network element having a tunnel router function, sending a detach request carrying a terminal indication information to a mapping server, requesting the mapping server to delete the The terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information.  2. The method according to claim 1, wherein the terminal indication information is a terminal identifier.  3. The method according to claim 1, wherein the terminal indication information is information identifying the terminal.  The method according to any one of claims 1 to 3, wherein the network element having the tunnel router function is an identity and location separation protocol mobile node (lisp-MN), or an ingress tunnel router, or an egress tunnel router.  The method according to any one of claims 1 to 3, wherein the detach request further carries one or more routing locations.  The method according to any one of claims 1 to 3, wherein the detach request does not carry a routing location.  A detaching method, which is applied to a lisp network, includes: after the mapping server receives the detach request of the carrying terminal indication information sent by the network element having the tunneling router function, deleting the locally stored indication information of the terminal indication Terminal ID/route location mapping corresponding to the terminal.  The method of claim 7, wherein, when the detaching request does not carry a routing location, the mapping server deletes all terminal identifier/routing location mappings corresponding to the terminal indicated by the terminal indication information stored locally .  The method of claim 7, wherein, when the detach request carries one or more routing locations, the mapping server deletes the terminal identifier/route corresponding to the terminal indicated by the locally indicated terminal indication information. A mapping in the location map that is the same as the one or more routing locations.  The method according to any one of claims 7 to 9, wherein the terminal indication information is a terminal identifier. The method according to any one of claims 7 to 9, wherein the terminal indication information is a standard Know the information of the terminal.  12. A detaching device applied to a network element having a tunnel router function, comprising: a generating unit, configured to: generate a detach request, where the detach request carries terminal indication information;  And a sending unit, configured to: send the detach request to the mapping server, and request the mapping server to delete the terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information.  The device according to claim 12, wherein the terminal indication information is a terminal identifier. The device according to claim 12, wherein the terminal indication information is information identifying the terminal.  The device according to any one of claims 12 to 14, wherein the generating unit is further configured to: carry one or more routing locations in the detach request, or not carry in the detach request Routing location.  A mapping server, the mapping server includes a receiving unit and a deleting unit, where: the receiving unit is configured to: receive a detach request of the carrying terminal indication information sent by the network element having the tunnel router function, and notify the deleting unit ;  The deleting unit is configured to: after receiving the notification, delete the terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information stored locally.  17. The mapping server according to claim 16, wherein  The deleting unit is further configured to: when the detaching request does not carry the routing location, delete all terminal identifier/routing location mappings corresponding to the terminal indicated by the locally indicated terminal indication information.  18. The mapping server according to claim 16, wherein  The deleting unit is further configured to: when the one or more routing locations are carried in the detaching request, deleting a routing location in the terminal identifier/route location mapping corresponding to the terminal indicated by the terminal indication information stored locally One or more terminal identification/routing location mappings with the same routing location. The mapping server according to any one of claims 16 to 18, wherein the terminal indication information is a terminal identifier. The mapping server according to any one of claims 16 to 18, wherein the terminal indication information is information identifying the terminal.