CN1283911A - Priority interface of open shortest path - Google Patents

Abstract

A method of configuring an OSPF interface in a network router(10, 10c)is provided. The method comprises: on connection of the router(10, 10c)in a network(1, 2b)running OSPF, automatically obtaining from the network(1, 2b)data indicative of the OSPF area of the OSPF interface of an existing network router(4a, 10b); and using said data to automatically configure an OSPF interface with said OSPF area in the newly-connected router(10, 10c). Corresponding apparatus and network systems are also provided.

Description

Priority interface of open shortest path

The present invention relates generally to OSPF (Open Shortest Path First) interface in the network router.

OSPF one is widely used in and is used for the Routing Protocol of routing IP data in IP (Internet protocol) network.In the network of an operation OSPF, router uses link state algorithm to be calculated to the shortest path of destination according to the link state database of being safeguarded by each router.Link state database is the linking status set basically, and it defines the state of the linking status of certain router own and other router, has received linking status information from other router.Therefore link state database defines the network topological diagram of being seen by special routers, and is used as route calculating by this router.OSPF provides the logical definition of network, is assigned to ospf domain at this network router.If certain router has the interface with ospf domain, it just belongs to this territory, thereby can set up certain with router in this territory scope and link.In order to dispose certain interface, be necessary for the required various parameters of setting up of interface definition ospf protocol.These set up parameter to represent interface to describe, and are used for confirming the interface of other router, can carry out like this by ospf protocol, and as the foundation of neighborhood, the database exchange, linking status upgrades the process of issue or the like appointment.The various parameters of setting up can define in certain interface, but in general an interface must dispose at least one IP address, and a subnet (by the prefix part definition of IP address) and an ospf domain are to confirm the interface of other router.Thereby interface is by network manager's manual configuration, and the network manager sets up network, and according to network configuration knowledge, subnet prefix input ospf domain and IP address with suitable dispose the interface in the router that is installed in the network.

According to an aspect of the present invention, provide the method for configuration ospf interface in network router, this method comprises:

During router in the network that connects operation OSPF, automatically obtain the data of ospf domain of the ospf interface of expression existing network router from network; And

The described ospf domain that uses described data to be used in the router that connects recently disposes ospf interface automatically.

Therefore according to the present invention, when router is connected in the network of operation OSPF, router automatically obtains ospf domain from network, disposes existing network router with this territory, as the router that has connected in network.Then, this router disposes the interface that ospf domain is arranged of itself with this ospf domain, does not need the network manager to import ospf domain by hand like this.

The characteristic of suitable dependence network can pre-configuredly have the IP address of the interface of suitable subnet prefix, so only needs ospf domain to come configuration interface.In case obtain it from network, handle by common the setting up that is used for confirming neighbours and generate neighbor state database or the like of OSPF appointment and just can carry out.Yet generate automatically during router in connecting network of ground preferably, the IP address of interface.This can use for example known system such as DHCP (DHCP) to realize that DHCP provides dynamic assignment IP the mechanism of address, and when main frame no longer needed these IP addresses, they can be reused like this.If a such system is by network support, in such cases, router can comprise that the webserver that suitable control logic comes the requirement management address to distribute distributes an available IP address.The IP address of receiving with the OSPF that obtains, can be disposed ospf interface with being used as from network.The subnet mask of the IP address part of subnet is confirmed in expression, in this case, also must be by server indication and pre-configured in router, and complexity for fear of system, subnet should be the same with the subnet of the interface of existing network router ideally, obtains ospf domain from this router.For fear of these complexity, and greater flexibility in order to operate, data with the subnet prefix of the ospf interface that obtains to represent described existing route device from network, and to described subnet prefix increase predetermined suffix method, generate the IP address of the router that connects recently, this is first-selected especially.So router can dispose with unique IP suffix simply here, and with increasing the method for this suffix to the subnet prefix of existing route device interface, the unique IP address of acquisition in correct subnet is used for the configuration at the ospf interface of the router that connects recently.

The required data of configuration ospf interface can in a different manner, obtain from network according to the characteristics of particular network.For example under the situation of radio network, can obtain data with the method for the multicast OSPF handshake packet (hello packet) that receives automatic network.Recently the router of Lian Jieing can be monitored IP multicast address (ALLOSPFRouters), and required data decompression is disposed its interface from the handshake packet that receives.Now, be connected the router in the radio network of ospf interface of promising certain special domain configuration, generally receive only the calling bag that territory ID is arranged in those corresponding those territories.At the enforcement router of the present invention that is used in this case, have only the control logic of adjusting router, the interface configuration when connecting for network like this, router will receive the calling bag of corresponding any ospf domain.Control logic uses the territory that receives bag of controlling oneself to come configuration interface then, as mentioned above, and operation as usually then.Suitable modification to the general router control logic realizes it, is obvious to those skilled in the art.

The special case that the present invention can use non-broadcast network wherein is the PNNI network.PNNI (private net is to network interface) is by the classification of use in atm network of ATM (asynchronous transfer mode) forum definition, the dynamic link state routing protocol.Atm network can use the expansion of the PNNI agreement of a kind of PAR of being known as (PNNI increases route) to come load IP flow.For example in January, 1999, atm forum in af-ra-0104.000 " PNNI increases route (RAR) ", has been described PAR.In simple terms, PAR allows the IP data, and it does not relate to atm network operation therein, distributes by network.In the PNNI network, in network owing to PTSE ' s (PNNI topology state elements) overflows and distributes topology information.PAR utilizes these PTSE ' s to distribute ATM topology information and IP for information about.PAR enabled device in the network encapsulates IP for information about in PTSE ' s, distribute PTSE ' s in common PNNI mode then.IP information in these " PAR PTSE ' s " is opaque to the PNNI node that those are not PAR enables, but the node that other PAR enables is known the form of the IP data among the PARPTSE ' s.Therefore, for example, the PAR enabled device in the network can the method by network PAR-PTSE ' s exchange common ospf information, and another PAR enabled device ospf information that can decompress, thereby OSPF can realize in the PNNI network.Therefore, in one embodiment of the invention, network is a PNNI network that comprises and a plurality of PAR enabled device, it uses the method for PAR-RTSE ' s to do the interchange of ospf information, recently the router of Lian Jieing can be the PAR enabled router, wherein in router, be used for disposing the required data of ospf interface, can use the method that receives a PAR PTSE and the described data that decompress therefrom from network, from network, obtain.When connecting the PAR enabled router in the PNNI network, the first common processing of distribution topology according to the PNNI definition receives PTSE ' s from network, and the ospf information that is included in like this among the PAR PTSE ' s will exchange the enabled router to PAR.

As what described just now, router can be a PAR enabled device, and in most of the cases not participate in PNNI be preferably to router itself.This can use and be called the further expanding of PNNI agreement of acting on behalf of PAR and finish.Act on behalf of PAR and in January, 1999 atm forum af-ra-0104.00 " PNNI increases route (PAR) ", also describe to some extent, as above mentioned.In simple terms, acting on behalf of PAR is a simple switched agreement, and it allows that the IP device is integrated in the atm network, does not need IP device operation PNNI fully.The IP device can be connected to network by the PAR enabled device that is configured to act on behalf of the PAR server, for example acts on behalf of the PAR server and comprises that realization is by the control logic of acting on behalf of the PAR server capability of acting on behalf of the PAR protocol definition.The IP device itself is configured to act on behalf of PAR client, comprises that realization is by the control logic of acting on behalf of PAR client's operation of acting on behalf of the PAR definition.According to acting on behalf of PAR, act on behalf of the details that PAR client can register the IP service of supporting to act on behalf of the PAR server.This information is encapsulated among the PAR PTSE ' s as previously described then, and circulates in network in due form.Act on behalf of PAR client and also can be connected information on other IP device in the network to acting on behalf of the PAR server requirement, the PAR enabled device has received PAR PTSE ' s for this reason, as previously described.In this way, transmit IP information, do not participate in the device among the PNNI from the IP device with to the IP device.Therefore, in one embodiment of the invention, wherein network is the PNNI network that comprises one or more PAR enabled device, and it uses PAR PTSE ' s method by internet exchange information, and the router of Lian Jieing can be configured to act on behalf of PAR client recently.In this case, this method comprises the following steps: by being configured to act on behalf of the PAR enabled device connection router of PAR server to network, be used in the method that receives described PAR PTSE in the PAR enabled device that is configured to act on behalf of the PAR server and obtain described data, from decompress described data and of PAR PTSE from acting on behalf of the PAR server to acting on behalf of PAR client communication data from network.

Be appreciated that generally the router for its configuration ospf interface can be connected to network with direct or non-direct-connected method.And connection itself can be that rigid line connects or wireless link.

Have superiority according to being configured in automatically in many network systems of ospf interface of the present invention, the present invention uses in mobile environment has advantage especially.With the router that is configured can be mobile network's mobile router, and the mobile network is attachable for any one of a plurality of access point nodes of one or more other networks.Each of this network or other network can be fixed network or mobile network.For example, the mobile network is attachable for a plurality of access point nodes of fixed network any one.At the router that will be configured is the place of mobile router, and each mobile network moves on to the ospf interface that another accessing points can require to dispose new ospf domain from an accessing points, and therefore manual in this case interface configuration is especially inconvenient.

Be appreciated that generally according to utilizing method of the present invention to describe the place of characteristic, corresponding characteristic can be provided in to be used on the equipment of the present invention, vice versa.Especially, another characteristic of the present invention is provided at the equipment of configuration ospf interface in the network router, this equipment comprises control logic, when in the network of operation OSPF, connecting router, adjust control logic, come to obtain to represent the data of ospf domain of the ospf interface of existing network router automatically from network, and use described data in the router that connects recently, to dispose the ospf interface of ospf domain automatically.

Another feature of the present invention provides network system, comprises:

First network, it comprises the network router that at least one has ospf interface, is connected the access point node of mobile network's to the first network with at least one; And

At least one mobile network, this mobile network include the mobile router of the equipment of describing before this.

The router that where will dispose is connected to the not only network of the existing route device of the interface of an ospf domain, is more suitable for employment mechanism so and controls the configuration that will adopt which special domain to be used as the interface in the router that connects recently.Can take various mechanism according to network characteristic with the demand of the special system realized.Yet the most advantageously, the suitable configuration of the network that is connected to by router provides this mechanism.For example, network can be a fixed network, and this fixed network includes a plurality of fixed network routers of the ospf interface of ospf domain separately, and is used for connecting a plurality of access point nodes of mobile network to fixed network.In this case, each access point node is got in touch with fixed network router separately with being more suitable for, like this, when connecting mobile network to described access point node, the data of ospf domain of representing the ospf interface of the fixed network router related with that access point node, control logic by mobile router obtains, as the configuration of the ospf interface that territory is arranged in mobile router.Access point node and the related mobile network of guaranteeing of the fixed network router (or groups of routers) that special ospf domain is arranged receive only the details of an ospf domain.This correlation energy realizes with the suitable design of network, and the access point node only exchanges the details of the router interface of its association to the mobile network who is connected to that node like this.An its special case general is described in detail as the example of PNNI network below, wherein access point node and the fixed network router that special ospf domain is arranged is related, is with the suitable configuration of PNNI cascade and uses a scope to limit to act on behalf of PAR announcement (advertisment) to special rank and realize.

To describe preferential embodiment of the present invention with the method for example with reference to the accompanying drawings now, wherein:

Fig. 1 illustrates an example that uses network system of the present invention;

Fig. 2 shows the view that the IP network of the system of type shown in Figure 1 disposes;

Fig. 3 shows another view that the IP network of the system of type shown in Figure 1 disposes;

Fig. 4 explains the PNNI cascade in using network system of the present invention and acts on behalf of the PAR advertisement policies; And

Fig. 5 a to 5d explains the different situations in the network system operation.

Fig. 1 is a schematic overview of using an example of network system of the present invention.This system includes backbone network 1a, as company's net, a fixed network, also include accessing points provider network (APPN) 1b, it provides fixed network to access to one or more mobile networks of this system.Single mobile network 2 uses numeral for the sake of simplicity.Fixed network 1 in this example comprises and ip router 4a is housed, the ATM interchanger 3a of 4b and 4c and the structure of 3b.Backbone network 1a or contrary ATM, or be connected to APPN 1b by ip router.The interchanger that is labeled as 3a is in the drawings set up the access point node of APPN 1b, and spreads all over the world.Mobile network 2 can schematically be pointed out as 5, is connected to any one of these access point nodes 3a via satellite.The router that is labeled as 4a is the marginal router of APPN 1b, and geographical distribution, and marginal in this embodiment router four a is positioned at Europe, America, Asia and Africa.Each marginal router four a be positioned at one and a plurality of access point node 3a near.Limit router four b is a gateway router, and it is connected and fixed network 1 to the Internet, as 6 schematically point out.The router that is labeled as 4c is the local router that is connected to the home server among the backbone network 1a.Home server 7 the one or more mobile networks 2 in system provide service.Mobile network 2 can one or more ATM interchangers, and two interchanger 8a that illustrate in this example are connected to different terminal system 9 with 8b.Here interchanger 8a is attachable with 5 couples one access point node 3a of wireless link.Mobile network 2 also has at least one to move marginal router, and the single mobile marginal router one 0 that illustrates in this example is connected to interchanger 8a.

Under situation about having illustrated, the mobile router 10 of mobile network 2 is connected to fixed network 1 by interchanger 8a.This will be for a more detailed description below, and mobile router 10 automatically disposes an ospf interface of the ospf domain of European marginal router four a.Therefore, the IP flow (representing with broken string among the figure) from mobile network 2 is sent to European marginal router four a by mobile router 10.From here, the destination is that the IP flow of the Internet routes to nearest internet gateway router 4b.The destination is that the IP flow of the home server 7 of mobile network transfers to the local router 4c in the backbone network, and therefrom to server 7.And mobile router 10 can have the ospf interface of the ospf domain of a pre-configured local router 4c that it is arranged.In this case, IP flow from mobile network to backbone network is delivered to local router 7 by this pre-configured interface (representing with the broken string of link mobile router 10 and local router 4c the figure), wherein the IP flow of the Internet transfers to European marginal router four a by the ospf interface of automatic configuration, as previously described.

The mobile network system described in this example uses ATM as transport layer, and the website all over the world of the APPN 1b by backbone network 1a is communicated by letter between mobile platform.APPN and mobile network are known, and can be adapted to mobility at the ATM layer.The PNNI mobility support that the IP layer utilization that will further describe below provided by the ATM layer, like this, except the automatic configuration of ospf interface to be discussed below, the IP layer is not known mobility, and as the fixed network system operation.The PNNI mobility support that provides by the ATM layer can, describe in the white paper below for example, further information can be with reference to " IBM moves atm network technology general view V2.0 ", IBM research laboratory, in August, 1998; And with reference to " IBM moves atm network, and network design and addressing are with reference to V2.0 ", IBM research laboratory, in January, 1999.Also can be with reference to " the PNNI appendix V1.0 of mobility expansion ", af-ra-0123.000.Details in the mobility support of ATM layer is not center of the present invention, does not need here to go through.Enough talkative, the ATM layer can re-route point-to-point SVC ' s (the virtual connection of switch type), comprises the router that is used for transmitting the IP bag between two routers to router SVC ' s, because when mobile network is mobile between accessing points, network configuration changes.When the mobile network will lose satellite or visible light link, connection was transferred automatically and is triggered, if one second link is arranged, connected rerouting to second link.

Fig. 2 describes an example of the IP network topology of network system, and that describes upward is the same.In this embodiment, the APPN of backbone network and fixed network 1 is integrated into as single autonomous system and moves in the same IP network of OSPF.Therefore, the same to shown in the figure, APPN limit router, gateway router 4b and local router 4c have the ospf interface that enters trunk ospf domain (0.0.0.0), are labeled as 12 in the drawings.Gateway router 4b uses for example BGP (wide gateway protocol) session, and is detailed with other autonomous system exchange IP route of the Internet 6.And each APPN limit router four a has the ospf interface of its ospf domain of usefulness 13 configurations.These ospf domains 13, when being connected to the access point node related with special APPN limit router four a, the marginal router that is moved net 2 uses,

Three mobile network 2a, 2b, 2c is shown in this figure.Mobile network 2a demonstrates and links 5 via satellite and be connected to and the related access point node of European APPN limit router.As the result of this connection, move the ospf interface that marginal router one 0a automatically disposes the ospf domain 13 of European marginal router.Move marginal router one 0 and comprise control logic (not illustrating separately), when mobile network and an APPN accessing points connected, control logic obtained as disposing the required data of this interface automatically from network.Required data are used PAR and are acted on behalf of the PAR agreement and obtain from network, this will be further described below.In case control logic receives this data, control logic is handled this data as following description, obtain configuration interface required set up data, and automatically supply this and set up data to give interface control circuit, in subsequent treatment, use by the OSPF appointment.Therefore.In case interface is with setting up data configuration to finish, interface is operated with the same manner, seems to set up data to be imported by hand by the network manager, is handled by the standard of OSPF appointment, as set up neighborhood and set up link state database or the like, can be to finish as the mode of manual configuration interface.Automatically the control logic of configuration interface can be with hardware or software or the two in conjunction with realization, and can be integrated into easily as a whole in the processor of control router operation.From the description here, the suitable realization of control logic will be easy to those skilled in the art.

In the present embodiment, when the connection mobile network makes APPN, the special data that control logic obtains from network comprises the IP address of APPN limit router four a, the subnet mask of the prefix part of the IP address of the subnet of expression definition APPN limit router, and the ospf domain 13 of marginal router.Control logic is used subnet mask to the IP address that the receives subnet prefix that decompresses then, and increases unique suffix to subnet prefix, thereby generates the IP address of interface.This prefix docking port is unique, and is kept in the control logic in advance for this reason.So control logic with the same subnet of the marginal router four a in Europe in generate unique IP address of this interface.This IP address then is supplied to interface control circuit with the ospf domain of the marginal router in Europe, as previously mentioned.May need to set up parameter as any other of interface configuration, the preferential and interface type as Designated Router (DR) can be pre-configured in interface, because these can not change when the mobile network is mobile between access point.Based on this kind consideration, DR preferentially generally is made as 0 selection that is used as Designated Router constraint router, because mobile router may move into and lose with fixed network and to contact.And, according to ad hoc network, subnet mask, perhaps in some cases even the IP address, and can be pre-configured in interface, provide greater flexibility in the operation by this example.

Return Fig. 2, European marginal router four a has interface, and this interface has ospf domain A.A.A.A and IP address 10.5.1.1, subnet prefix 10.5.1.Therefore, describe as top, when being connected to APPN, the router one 0a of mobile network 2a disposes the ospf interface with ospf domain A.A.A.A and IP address 10.5.1.245 automatically, and wherein 245 is suffix of unique affirmation of interface.The second mobile network 2b that moves marginal router one 0b is arranged, link 5 via satellite and be connected to related APPN access point node with Asia limit router four a.Limit, Asia router has an ospf interface, and this interface configuration has ospf domain C.C.C.C and IP address 10.5.3.1, subnet prefix 10.5.3.Therefore, when setting up satellite link, mobile router 10b automatically disposes ospf interface with territory C.C.C.C and IP address 10.5.3.248, and wherein 248 is unique suffix of interface.Whether mobile ATM system also is supported in visible light link between some mobile network, no matter have with fixed network be connected.In explaining example, large-scale mobile network 2b provides the visible light link to support, and demonstrates the small-sized mobile network 2c that is connected to mobile marginal router one 0c with this link LS.In order to support this link of IP layer, it is one additional that mobile router 10b has, and pre-configured ospf interface, this interface have territory X.X.X.X and IP address 10.9.1.1, subnet prefix 10.9.1, and they are unique to this network.When between two mobile network 2b and 2c, setting up link LS, mobile router 10c automatically disposes the ospf interface of territory X.X.X.X and IP address 10.9.1.252, wherein 252 is unique suffix in this case, as previously described, obtain data necessary from mobile network 2b in this case.In order ospf domain X.X.X.X to be routed to fixed network 1 from " objective node " (guest node), mobile router 10b generates an OSPF virtual linkage VL with limit, Asia router four a.This virtual linkage VL produces in a known manner according to ospf protocol, and objective nodes domains X.X.X.X is connected to trunk ospf domain 0.0.0.0.

The Fig. 2 that has just described has explained the IP network topology of " dynamic IP configuration ", wherein from all IP flows of mobile network, no matter flow to the Internet or flow to mobile network's local router 4c, self-configuring ospf interface routes of the mobile router of the ospf domain by having APPN limit router four a all.Dynamic-configuration can with " static IP configuration " combination that early contacts, mobile router has the pre-configured ospf interface of the ospf domain of a local router with it here.In this case, by the self-configuring interface route, but the IP flow that flows to local router 4c is by pre-configured interface route as the front for the IP flow from the mobile network to the Internet.Fig. 3 shows the example of IP topology in this case, and wherein two mobile network 2a are connected as Fig. 2 with 2b, and each mobile network has a local router 4c.As explaining, the local router 4c of mobile network 2a has an interface, and it has territory H.H.H.H and IP address 10.1.1.1.Mobile router 2a has pre-configured interface, and it has territory H.H.H.H and IP address 10.1.1.245.Similarly, the local router 4c of mobile network 2b has an interface, and it has territory I.I.I.I and IP address 10.1.2.1, and local router 10b has pre-configured interface, and it has territory I.I.I.I and IP address 10.1.1.248.The configuration of this static state that combines and dynamic IP makes the routing optimality of IP flow, and home server provides the service of the centralization that is not geographical distribution simultaneously, and the APPN gateway router of geographical distribution provides the internet access of IP internet traffic.

Mobile router obtains to dispose automatically the mechanism of the necessary data of ospf interface, is described referring now to Fig. 4.This figure schematically explained about the PNNI cascade of the essential element of network system and acted on behalf of the PAR advertisement policies, as mentioned above.In the lowermost level of PNNI cascade, the level 88 in this example, Europe and limit, Asia router four a illustrate, and each all links to each other with APPN access point node 3a.Each node 3a with being also may not be one or more other APPN nodes of access point node, forms a PNNI end group in level 88.End is gathered by the ellipse representation among the figure, and for the sake of simplicity, has only an additional APPN node in this case shown in each end group.As mentioned above, define the end group here so that in each end group, have only an APPN limit router.

Large-scale mobile network 2b demonstrates and links the 5 simple 3a of access point that are connected to Asia limit router via satellite.This mobile network for the sake of simplicity, is represented by single ATM interchanger 15 and mobile router 10b, and in the lowermost level of PNNI cascade, promptly level 88 forms an end group.Similarly, small-sized mobile network 2c by interchanger 16 and mobile router 10c representative, forms an end group in level 88.Small-sized mobile network 2c is connected to large-scale mobile network 2b by visible light link LS.

Large-scale and small-sized mobile network 2b and 2c are represented by logical group node, and it is high-level, promptly form the end groups in the level 72 of PNNI cascade here.So this rank is such rank, promptly connect and be present in large-scale mobile network and be connected to as objective node among the PNNI cascade between the small-sized mobile network of catenet in this level logic, and be such rank, promptly the small-sized like this or objective network of this rank can integrated large-scale mobile network cascade.So level 72 is labeled as " mininet " rank.Mobile network when objective network, no matter have or do not have chain prostitution network, when being connected to APPN, represent by LGN in the end group of the catenet of level 72, LGN and the higher level at the PNNI cascade of representing it are that the LGN of the APPN access point interface of level 64 shares the pair of end group here.So level 64 is such ranks, promptly connects and be present between the access point node that the large-scale mobile network that is connected to APPN access point node and its connects in this level logic.So in this rank, the integrated APPN cascade of large-scale mobile network's energy, so this rank is labeled as " catenet " rank in the drawings.As we can see from the figure, level 64 end groups only comprise APPN limit router, with the related access point node of other different routers of this grade between do not have logic to connect.The access point node connects in static higher level logic, and level 32 (" access point " ranks) for the PNNI cascade are that logic connects here.

As what just discussed, ip routing information uses PAR and acts on behalf of PAR and exchange by network system.The APPN access point node 3a that APPN limit router four a connects moves the PAR that acts on behalf of the PAR server to enable interchanger.PAR client is acted on behalf of in each one of APPN limit router four a operation.According to acting on behalf of PAR, APPN limit router is being acted on behalf of its service of PAR server registration.Here Zhu Ce information comprises the IP address of router, subnet mask, ospf domain and Designated Router priority.This information enables interchanger by PAR and is encapsulated in PARPTSE ' s, and announces in the PNNI network by common mode.Yet when registering its detailed information, router is also indicated the announcement scope of these details.In this example, the corresponding PNNI level 64 of scope.Therefore as shown in the figure, the PAR announcement of acting on behalf of of APPN limit router ospf interface enables the interchanger announcement to level 64, as the macrotype platform rank by PAR.In the access point rank, promptly level 32 is not acted on behalf of the PAR announcement.Therefore, the announcement about an APPN limit router can not be received by the PAR enabled device of another APPN limit router of service.Yet when the mobile network such as network 2b was connected to APPN, the PAR that acts on behalf of that it will receive the APPN limit router related with the APPN access point announced.Therefore, as shown in the figure, mobile network 2b has the PAR that acts on behalf of of the ospf interface detailed information of limit, Asia router to announce reception.

Interchanger 15 in mobile network 2b also is the PAR enabled device, and the PAR server is acted on behalf of in operation.PAR client is acted on behalf of in mobile router 10b operation, and according to acting on behalf of PAR, can be its details of acting on behalf of relevant other ip router of PAR server of server lookup.Therefore, when setting up satellite link 5, the PAR control logic of acting on behalf of of mobile router 10b is sent request to server, the details of the ospf interface of request in any subnet (IP address 0.0.0.0).So, the details of the ospf interface of limit, the server response Asia router in the interchanger 15, mobile router 10b automatically disposes ospf interface with suitable ospf area then, as previously mentioned.After interface configuration was intact, then mobile router can be set up neighborhood with limit, Asia router, and necessary IP information is encapsulated in the ATM bag in due form.

In mobile router 10b, connect for objective node the ospf interface that is provided with territory X.X.X.X in advance by mobile router act on behalf of that PAR client's logic is registered in interchanger 15 act on behalf of the PAR server.This is that being registered in respective stages 72 is in other scope of small-sized platform class.Therefore, the acting on behalf of PAR announcement and will announce of this interface to level 72, it will enable interchanger 16 receptions at mininet 2c by PAR when setting up visible light link LS here.Interchanger 16 is acted on behalf of the PAR server at mobile router 10c to acting on behalf of PAR client's logic operation.Therefore, by the same manner of describing just now, mobile router 10c will receive the detailed data of objective node interface at mobile router 10b, will dispose the ospf interface of territory X.X.X.X automatically, and will set up neighborhood with objective node interface at router one 0b.Notice that as shown in the figure, the mobile router 10c of mininet 2c receives the two the announcement of service of the router of large-scale mobile platform and limit, Asia router.Yet, dispose the control logic among the mobile router 10c, receive only the service of lowest range.

Fig. 5 a to 5d is illustrated in the example under the different situations in the operation of above-described network system.Under each situation, only show the subnet of network element for the sake of simplicity.Fig. 5 a explains has the mobile network 2a ship L1 that issues an order aboard ship to roam on the Atlantic Ocean.Mobile network 2c roaming in same marine site and keep the laser visible light to link LS with the ship L1 that issues an order than canoe S1 aboard ship arranged.Router one 0c on S1 has disposed the interface of territory X.X.X.X, and uses OSPF with the router one 0a exchanging routing information on the L1.The IP flow can exchange between the main frame on ship L1 and the S1 then.With the connection of fixed network structure, ship L1 and S1 do not form independently network.At Fig. 5 b, naval vessel is mobile, so that L1 enters the overlay area of the satellite related with European marginal router.Connect and can get in case set up satellite link and ATM, the mobile marginal router of L1 activates the pre-configured interface at territory H.H.H.H operation OSPF, and sets up neighborhood with its local router 4c.Simultaneously, what have on the European marginal router of IP interface of router by operation OSPF in the A.A.A.A of territory acts on behalf of PAR study, and with the automatic configuration interface in this territory.It also generates the OSPF virtual linkage VL of an existing ospf domain X.X.X.X of link to trunk ospf domain 0.0.0.0.The IP bag can transfer to the router on the L1 now from the main frame on the S1, it otherwise by its interface that ospf domain H.H.H.H is arranged they are delivered to local router, or they are delivered to the marginal router in APPN Europe by the interface that territory A.A.A.A is arranged of configuration recently.The IP flow of server is transferred to local router in the local network, and other IP bag routes to European marginal router simultaneously.From the IP flow of fixed network, according to where generating flow, or by the European marginal router interface of territory A.A.A.A is arranged, or pass on by the L1 local router interface that territory H.H.H.H is arranged.

At Fig. 5 c, along with naval vessel moves, the satellite link between L1 and the European access point dies down, and transfers the America satellite link necessity that becomes to.In case new url is set up and ATM connects foundation, the ATM connection on the satellite that is weakening is automatically re-routed by the ATM layer.This is included in the mobile router 10a of L1 and the point-to-point SVC ' s between the European marginal router.When the control logic of router one 0a detects the variation of acting on behalf of in the PAR information, this information is response agent PAR client's the periodic request to IP information, by its server distribution, control logic automatically disposes ospf interface automatically with the ospf domain B.B.B.B of new IP address and limit, America router, as shown in the figure.Router one 0a also produces to the virtual linkage VL of new APPN limit router, and X.X.X.X links to backbone domain with the territory.The control logic of mobile router is removed the interface of European marginal router then, and from then on to the new interface route of the IP of APPN flow by limit, America router.

Situation shown in Fig. 5 d is except ship S2, and is the same with Fig. 5 c, and small-sized mobile network 2d is arranged on the ship, added the marine site.Setting up when being connected LS with the visible light of L1, the mobile marginal router one 0d of S2 disposes the ospf interface of territory X.X.X.X with the same manner, and it is the same to describe S1 to the front.

More than as seen, the automatic configuration of the ospf interface in the embodiments of the invention provides remarkable advantage, allows that particularly mobile network's height is effectively operated.Yet, be appreciated that embodiments of the invention also can be applied to the advantage in the fixed network system, avoid the needs of the present human configuration interface that needs.Be appreciated that also preferential embodiment has described in detail above resembling, can make many variations and modification to the embodiment that describes, and do not depart from category of the present invention.With the mode of example, in the network system of Miao Shuing, APPN and trunk ATM net are integrated in the IP layer in the above, as single autonomous system (AS) operation OSPF.In another IP configuration, company's (trunk ATM) net and APPN are two distinct networks in the IP layer, and they move different OSPF situations as autonomous system separately.In this example, two systems use an inside AS Routing Protocol exchange ip routing information such as BGP.And, the place that the interface that is provided with local router in advance is arranged at mobile router (static IP configuration) in company's net, internal bgp session in the use router comes this OSPF system of bridge joint and disposes the OSPF system of the interface of APPN automatically, and this is understandable to those skilled in the art.

As another example, when describing non-broadcast system in detail, the present invention also may be used on broadcast system when top.A plurality of access point nodes of in this case, for example, that mobile network's mobile router links to via satellite is one or more (fixing or move) radio network can be attachable.When setting up satellite link, mobile router disposes the data of the interface of suitable ospf domain with the method for listening to IP multicast address (ALLOSPFRouters), acquisition, as previously mentioned.Each access point node can be related with the router (or groups of routers) of the interface that single ospf domain is arranged, and uses for mobile router when being connected to that access point node.Promptly, network can dispose like this, and when mobile router is connected to the access point node, mobile router will receive multicast OSPF and call out bag, this calls out only that ospf domain about being used by the mobile network of bag, and is not in relation to those other routers related with other access point.In order to handle such situation, the place among the satellite range of mobile network at a not only access point, the mobile network suitably comprises the method for selecting a special satellite link, is that mobile router uses.For example, network can comprise the logic that is used for assessing the signal relative length that receives by the moving satellite link, also comprises the logic that links to the signal of mobile router with highest signal length only is provided.This guarantees that mobile router receives only relevant with single ospf domain multicast OSPF and calls out bag, and ospf interface should be with this ospf domain configuration in mobile router.

Claims (21)

1. One kind in network router (10,10c) in the configuration ospf interface method, this method comprises:

   The network that connects operation OSPF (1, during router in 2b), from network (1,2b) obtain expression existing network router (4a, the data of the ospf domain of ospf interface 10b) automatically; And

   Use described data the router that connects recently (10, dispose the ospf interface of described ospf domain in 10c).
2. 2. method as claimed in claim 1, comprise IP address of automatic generation be used for the router that connects recently (10,10c) in the configuration ospf interface.
3. 3. method as claimed in claim 2, comprise from network (1,2b) obtain the described existing network router (4a of expression automatically, the data of the subnet prefix of ospf interface 10b), and with increase the method for predetermined suffix to described subnet prefix generate the router that connects recently (10, the IP address of ospf interface 10c).
4. 4. as any method of above-mentioned claim, wherein said network is a radio network, and this method comprises using and receives the method that multicast OSPF calls out bag from network obtain described data from network, and the described data that decompress therefrom.
5. 5. as any method of claim 1 to 3, wherein said network (1,2b) be the PNNI network, it comprises the one or more PAR enabled device (3a that pass through the internet exchange ospf information with the method for PAR PTSE ' s, 15), wherein the router that connects recently (10,10c) be the PAR enabled router, this method comprises uses the method that receives described PAR PTSE from network to obtain described data from network, and the described data that decompress therefrom.
6. 6. as any method in the claim 1 to 3, wherein said network (1,2b) be the PNNI network, it comprises the one or more PAR enabled device (3a that pass through the internet exchange ospf information with the method for PAR PTSE ' s, 15), the router (10 that connects recently wherein, 10c) be configured to act on behalf of PAR client, this method comprises by being configured to act on behalf of the PAR enabled device (8a of PAR server, 16) connect router (10,10c) to network, with be used in the method that receives described PAR PTSE in the PAR enabled device that is configured to act on behalf of the PAR server and from network, obtain described data, and from decompress described data and of PAR PTSE from acting on behalf of the PAR server to acting on behalf of PAR customer communication data.
7. 7. any method as in the above-mentioned claim, comprise by wireless link (5, LS) connect router (10,10c) to described network (1,2b).
8. 8. any one method as in the above-mentioned claim, wherein the router that connects recently is the mobile router (10) of mobile network (2), it is attachable to any one of a plurality of access point nodes (3a) of fixed network (1).
9. 9. network router (10, the device of configuration ospf interface 10c), this device comprises control logic, (1,2b) middle connection router (10, come from network (1 in the time of 10c) by the adjustment control logic at the network that moves OSPF, 2b) obtain expression existing network router (4a automatically, the data of the ospf domain of ospf interface 10b), and use described data come the router that connects recently (10, dispose the ospf interface of described ospf domain in 10c) automatically.
10. 10. device as claimed in claim 9, wherein control logic is adjusted to from network (1,2b) obtain the described existing network router (4a of expression automatically, the data of the subnet prefix of ospf interface 10b), and by increasing predetermined suffix IP address of method generation to described subnet prefix, the router that is used for connecting recently (10,10c) middle configuration ospf interface.
11. 11. as the device of claim 9 or 10, wherein said data are radio networks, and wherein control logic is adjusted to use the method from network reception multicast OSPF calling bag to obtain described data from network, and the described data that decompress therefrom.
12. 12. device as claim 9 or 10, wherein said network (1,2b) be the PNNI network, it comprises the one or more PAR enabled device (3a that pass through the internet exchange ospf information with the method for PAR PTSE ' s, 15), wherein control logic comprises the PAR logic that is used for from network receiving PAR PTSE ' s, adjust control logic come from the PAR PTSE that receives decompress described data be used for the router that connects recently (10,10c) in the configuration ospf interface.
13. 13. device as claim 9 or 10, wherein said network (1,2b) be the PNNI network, it comprises the one or more PAR enabled device (3a that pass through the internet exchange ospf information with the method for PAR PTSE ' s, 15), wherein control logic comprises and acts on behalf of PAR client's logic, connecting router (10, during 10c) to network, by being configured to the PAR enabled device (8a of acting server, 16) adjust this and act on behalf of PAR client's logic and come to send request to acting on behalf of the PAR server, request is included in the ospf information among the PAR PTSE that is received by server, and described like this data obtain from act on behalf of the PAR server to respond described request.
14. 14. a network router (10,10c) comprise as any one device in the claim 9 to 13.
15. 15. (2,2c), it is to one or more other networks (1 for a mobile network, in a plurality of access point nodes (3a, 15) 2b) any is attachable, and the mobile network (2,2c) comprise mobile router as the device of any in the claim 9 to 13 (10,10c).
16. 16. a network system comprises:

    First network (1,2b), it comprises the network router that at least one has ospf interface, be connected with at least one the mobile network (2,2c) to first network (1, access point node 2b) (3a, 15); And

    As at least one mobile network of claim 15 (2,2c).
17. 17. as the network system of claim 16, wherein

    Described first network is a fixed network, and it comprises a plurality of fixed network routers of the ospf interface of ospf domain separately that have, and is connected a plurality of access point nodes of mobile network (2) to fixed network (1); And

    Each access point node (3a) is related with fixed network router (4a) separately, like this, when connecting mobile network (2) to described access point node (3a), the data of ospf domain of representing the ospf interface of the fixed network router (4a) related with the access point node, control logic by mobile router (10) obtains, and is used for disposing in mobile router (10) that territory ospf interface.
18. 18. as the system of claim 17, wherein:

    Wherein fixed network (1) is the PNNI cascade network, and each described fixed network router (4a) is configured to act on behalf of PAR client, and be connected to separately the PAR enabled device (3a) that is configured to act on behalf of the PAR server, it announces the ospf interface of the router (4a) that connects in fixed network (1) with the method for PAR PTSE ' s, the announcement scope of the described ospf interface of the intended level of acting on behalf of the corresponding PNNI cascade of PAR client of fixed network router (4a) (level 64) definition,, set up logic and connect at the access point node (3a) related and be connected between the mobile network (2) of that access point in this rank with fixed router (4a);

    Configuration PNNI cascade is so that rank (32) logic of access point node (3a) on described intended level (level 64) connects, described like this access point node (3a) is announced the reception of the ospf interface of that router by PAR PTSE ' s, only with described fixed network router (4a) in one related; And

    The control logic of mobile router (10) comprises acts on behalf of PAR client's logic, mobile network (2) comprises the PAR enabled device of acting on behalf of the PAR server that is configured to mobile router (10), when connecting mobile network (2) to described access point node (3a), adjust control logic and send request to the PAR enabled device of acting on behalf of the PAR server that is configured to mobile router (10), be included in the ospf information in PAR PTSE ' s of request to receiving by server, the data of the ospf domain of the ospf interface of described like this expression fixed network router (4a) are obtained with the response described request by control logic, and 4a is related with the access point node (3a) that mobile network (2) connects.
19. 19. system as claim 17 or 18, wherein fixed network (1) comprises the local router (4c) of the home server that is connected to mobile network (2), it has the ospf interface in local ODPF territory, and wherein mobile router (10) includes the pre-configured ospf interface of described local ospf domain.
20. 20. as any system in the claim 16 to 19, wherein the mobile network (2,2c) by wireless link (5, LS) to first network (1, be attachable 2b).
21. 21. as any system in the claim 16 to 20, comprise by wireless link (5, LS) interconnected a plurality of described mobile network (2a, 2b, 2c, 2d), at least one first mobile network (2a, mobile router (10a 2b) wherein, 10b) ospf interface of pre-configured objective ospf domain (X.X.X.X) is arranged, when first and second mobile networks connect, by second mobile network (2c, mobile router (10c 2d), 10d) use, like this, when connecting first and second mobile networks, the second mobile network (2c, mobile router (10c 2d), (2a, 2b) the automatic data that obtain the objective ospf domain of expression (X.X.X.X) are used for disposing the ospf interface in objective territory to control logic 10d) from first mobile network.

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