KR100723570B1 - Network Interface Redundancy Device and Method in Virtual Home Network - Google Patents

Abstract

The present invention provides a network interface redundancy device and a method for virtual network network redundancy operation for configuring a virtual home network in a home agent for mobile IP support among mobile nodes of the IMT200 network. Monitoring a state of operation of the plurality of network interface units and detecting a problem situation; If a problem is detected in any one of the network interface unit, the control unit transferring routing information of the network interface unit to a normally operating network interface unit; When routing information of the network interface unit having a problem situation is transmitted, the network interface unit in operation normally notifies the routing information to the external routing means located between the public network and the IP network, and provides a redundant network interface. Thus, in the normal state, a plurality of boards can divide the interface functions to improve the efficiency of resource management and distribute the load of the processor, and each of the plurality of interface boards can perform its own function in a separate state. In the event of a problem with one board, the other board can be independent of the problem and perform the interface functions of the other board.

Description

Device for network interface redundancy of virtual home network and method thereof {Apparatus and method for duplicate virtual home network interface of virtual home network}

1 is a block diagram showing a home agent and mobile IP protocol processing on an IP network in a typical wireless communication network.

2 is a diagram illustrating a structure of transmission traffic between a mobile terminal and an Internet host in FIG.

3 is a block diagram of a network interface redundancy apparatus of a virtual home network in a wireless communication network according to an embodiment of the present invention.

Figure 4 is a flow chart of a network interface redundancy method of a virtual home network in a wireless communication network according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

210: mobile node 220: PDSN

230: Internet 240: Internet Host

250, 271, 272, 281, 282: Router

260: IP network 261, 262: gateway

263: AAA 270, 280: network interface unit

273, 283: virtual home network 290: control unit

The present invention relates to a virtual home network in a home agent (HA) in a wireless communication network, and more particularly, to a virtual home network configuration in a home agent for mobile IP support among IMT200 network nodes. The present invention relates to a network interface redundancy device and a method for virtual home network suitable for duplex operation.

In general, in the case of the mobile IP protocol according to the RFC2002 standard, the mobile node has two IP addresses in order to maintain connection of the transport layer and correct routing of the IP layer. One address is a home address, which is fixed like a general Internet Protocol (IP) address, and is used to distinguish a Transmission Control Protocol (TCP) connection. The other address is a care-of address (COA) that changes at each new connection point, reflecting the actual location of the mobile node, such as a notebook computer.

The prior art for such IP network redundancy realizes network redundancy by redundancy of the board.

In other words, by using two boards, one is in active mode and the other is in standby mode. Actual functioning is performed when the board in active mode is rebooted due to abnormal operation. Is copied to the board so that the board in standby mode operates as the active mode. This generally follows board or unit redundancy.

However, the conventional redundancy method according to the principle as described above has the following problems.

First, it wastes resources on the board in standby mode. Reserved boards in case of abnormality do not contribute to system performance under normal circumstances.

In addition, since the standby mode is converted to the active mode by copying the state when the board in the active mode is rebooted, the same problem may occur in the board in the standby mode.

The present invention was created to solve the above-mentioned conventional problems, and an object of the present invention is to duplicate a network interface for configuring a virtual home network in a home agent for mobile IP support among IMT200 network nodes. In the event of a problem, another interface device provides a network interface redundancy device and a method of dually operating a virtual home network so that the service part of the interface device in question can be serviced while performing normal service.

Network interface redundancy apparatus of the virtual home network of the present invention for achieving the above object, manages the binding table of the mobile node and the resources and state of each network interface unit, and detects the network network unit problem situation and the routing information of the interface unit A controller configured to transfer the interface unit to a normal operating unit; It selectively operates in master and slave mode to route datagrams between mobile nodes and public network hosts.In case of a problem in interface part that operated as master while operating in slave mode, it receives routing information of the interface part. A plurality of network interface units adapted to serve together with routing information; Routing information is provided to handle the routing between the IP network and the public network, characterized in that it comprises a routing means for receiving it when the routing information of the network interface unit is changed to update its own routing information.

Network interface redundancy method of the virtual home network of the present invention for achieving the above object, the control unit monitors the operating state of the plurality of network interface unit to detect a problem situation; If a problem situation is detected in any one of the network interface unit, transmitting, by the control unit, routing information of the corresponding network interface unit to a normally operating network interface unit; When the routing information of the network interface unit in which the problem situation occurs is transmitted, the normally operating network interface unit comprises the step of notifying the routing information to the external routing means located between the public network and the IP network.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing a home agent and a mobile IP protocol processing on an IP network in a typical wireless communication network, FIG. 2 is a diagram illustrating a structure of transmission traffic between a mobile terminal and an Internet host in FIG. 1, and FIG. 3 according to an embodiment of the present invention. 4 is a block diagram of a network interface redundancy apparatus of a virtual home network in a wireless communication network, and FIG. 4 is a flowchart of a network interface redundancy method of a virtual home network according to an embodiment of the present invention.

According to FIG. 1, the mobile node 210 receives a home address from a home network. The home network is a network including a home agent node and is usually a private network or a provider network to which the mobile node 210 is registered. When a node moves and is not connected to a home network but is connected to another network (external network), the home agent receives all packets destined for the mobile node 210 to the external network to which the mobile node 210 is currently connected. To pass.

In the 3G mobile communication network such as IMT2000, the mobile node 210 recognizes the movement of the packet zone with a solicitation request and an agent advertisement message of an external agent (Foreign Agent or FA). After that, the mobile IP (Mobile Internet Protocols, or MIP) registration is performed. In this case, the mobile node 210 may register using '0' or a fixed IP address in the home address field of the MIP registration request message. The external agent is implemented as a packet data service node (PDSN) system 220 or the like.

A home agent, typically connected to a router via an Ethernet line, is connected to the IP network 260 and manages the binding list for the mobile node 210 serviced by it.                     

Referring to the mobile IP registration procedure of the mobile node 210, when an advertisement is sent from the PDSN system 220, which is an external agent, the mobile node 210 issues a MIP registration request, and the PDSN system 220 receives a request from the AAA 263. MIP registration request for home agent with user authentication. Then, when the home agent issues an access request to the AAA 263 to receive the access permission, the home agent forwards the MIP registration acceptance to the PDSN system 220, and the PDSN system 220 sends the MIP registration response to the corresponding mobile node 210. You will follow the procedures for delivery. At this time, the encryption key required for authentication is processed in the access request and authorization process.

In addition, the home agent manages a mobility binding table using a mobile IP protocol to support mobility of the mobile node 210 in the IMT2000 network, and authenticates and authenticates external agents to the mobile node 210. IPSec function for the tunnel with and captures data destined for the IP address assigned to the mobile node 210 from the packet network to tunnel to the corresponding COA.

To support this function, the home agent performs MIP signaling, authentication, IPSec negotiation and overall binding table management, and routing, tunneling, IPSec and local binding table management. The binding table is included in the registration request message of the mobile node 210 or assigned and recorded by the home agent.

For example, the mobile IP binding table managed by the home agent is shown in Table 1 below.

Item meaning NAI Identifier for Individual Registered Mobile Node 210 MN Home address of the mobile node 210 COA Care-Of Address of Mobile Node 210 Source address IP source address of registration request Home agent address Address in home network's IP network 260 Registration flag Registration Flags by Mobile Node 210 Security level Security level when applying IPSec QoS Quality of service ReqID_L Lower 32 bits of the ID ReqID_H Top 32 bits of the ID Time_G Lifetime Allowed for Mobile Node 210 Time_R Time remaining until life time completes

In mobile IP, the home agent system generates an IP packet header destined for the COA of the mobile node 210 for redirection. The generated header is used as the header of the new IP packet that wraps the original packet. That is, the home address of the mobile node 210, which is the destination address in the header of the original packet, is included in the payload of the new packet, so that it does not affect routers processing the packet while routing to the COA. In this way, the original packet is wrapped in a new packet for transmission.

The transmission traffic between the mobile node 210 and the Internet host 240 will be described. When the mobile terminal in the mobile node 210 transmits the IP data, the external agent adds and transmits the home agent IP on the IP network 260, and the home agent transmits only the IP data excluding its IP address to the Internet host ( 240). In the reverse transmission, if the Internet host 240 transmits the IP data, the home agent adds and transmits the IP of the external agent, and the external agent transmits only the IP data of the mobile node 210 except for its own IP address. It is transmitted to the mobile terminal.

This embodiment configures a network interface board of a master / slave type using the characteristics of a home agent, and allocates a virtual home network accordingly so that both boards can handle network redundancy while performing normal operations. It is.

As shown in FIG. 3, the home agent according to the present embodiment includes a controller 290 and a network interface block. The network interface block is divided into two network interface units 270 and 280 according to the concept of redundancy, which will be referred to as network interface unit 1 270 and network interface unit 2 280, respectively. Here, the network interface unit 1 270 includes a virtual home network 1 273 and two routers, that is, router 1 271 and router 2 272. The same applies to the network interface unit 2 280.

In the network configuration for the packet service for the mobile node 210, the configuration and operation of the mobile node 210, the PDSN system 220 as an external agent, the Internet 230 as the public network, and the Internet host 240 are common techniques. Follow the instructions. At this time, routing by the router 3 250 is performed between the Internet network 230 and the IP network 260.

The home agent performs a function of configuring a virtual home network composed of mobile IPs assigned or assigned to the mobile node 210. The home agent manages the binding table of the mobile node 210 through the IP network 260. Each router 1 (271) 281 of the redundant network interface unit is responsible for routing between the IP network 260 and the home agent. That is, the virtual home network is composed of a home agent IP address, a mobile IP, and has an IP address belonging to the IP network 260 for a network interface.

The network interface unit performs a function of routing IP datagrams between the mobile node 210 (or mobile terminal) and the end host, and the controller 290 manages mobile IP registration / deregistration and database, and manages the state of the network interface block. Watch. That is, the controller 290 manages resources and states of the network interface block and manages a binding table. That is, the controller 290 and the network interface block share the same binding table. Therefore, when mobile IP registration is approved, the approved mobile IP information is recorded in the binding table.

The network interface unit is divided into a master and a slave, and there is no difference in operation or function according to the mode setting of the master and the slave except for the case where a problem occurs in one network interface unit.

Router 2 (272) 282 is a physical interface with an IP address, while Router 1 (271) 281 is a virtual interface without an IP address.

Router 1271 and 281 add routing information to the corresponding router (router 2 of the master or slave) for the registered mobile IP. If both the master and the slave are normal, each router 1 (271) 281 is to send the routing information for the mobile IP with itself to router 2 (272) (282) belonging to the same network interface unit.

The conceptual data processing process constitutes a home agent internal network structure in the form of a virtual home network connected to routers 2 (272) and 282 of each network interface unit. For this purpose, a virtual home connected to router 1 (271) and 281 is used. It consists of Network 1 and Virtual Home Network 2.

The two network interface units may be implemented with respective interface boards. The master / slave separation of the virtual home network is performed by which interface boards the IP addresses of the home agents are activated and managed. The board that manages the active IP address of the home agent becomes the master. The host (mobile IP) of the rest of the virtual home network registers the network to route the assigned board when a packet is received from outside. The interface between Router2 272 and Router1 271 and 281 does not allocate IP, and exists in the form of a virtual interface.

If the network of the home agent is configured in such a structure, when the master is down, the controller 290 activates the home agent IP and the IP active in the master to the slave, changes the routing information of the blue router of the slave, and then The slave acts as the master by informing the network using routing protocols.

In addition, the home agent IP address is added to the router 2271 of the master side during the initialization process.

On the other hand, each virtual home network is provided by appropriately dividing the IP address assigned to the entire virtual home network. That is, the IP address serviced by the virtual home network 1 (273) and the IP address serviced by the virtual home network 2 (283) are different from each other, and a problem occurs in one network interface unit. If 273 is not in service, the virtual home network 2 283 may serve all of the IP addresses assigned to the entire virtual home network.

A path must be formed between the two network interface units 270 and 280 so that routing information can be transmitted to each other. Among them, router 1 281 and router 2 (of the network interface unit 2 280) with respect to the slave side. The virtual interface between 282 is called a virtual interface VIF1, and the virtual interface between router 2 282 of network interface 2 280 and router 1 271 of network interface 1 270 is called virtual interface 2 (VIF2). The virtual interface between Router 1 281 of Network Interface 2 (280) and Router 2 (272) of Network Interface 1 (270) is called VIF3, and Router 1 (of Network Interface 1 (270)). The virtual interface between 271 and router 2 (272) will be referred to as VIF4.

If each network interface part is normal, if the destination is a home agent IP or a virtual home network 1 (273), it is virtualized through router 2 (272), which is a physical interface of the master-side network interface part, by an external router 3 250 adjacent to the home agent. It is transmitted to router 127 which is an interface. And even slaves operate according to the same scheme.

In contrast, when the master is down or rebooted, the redundant network interface operates in the following manner.

First, it is assumed that the IP address is used as follows for convenience of explanation.

  Virtual home network: 192.168.1.1 255.255.255.0

  Virtual Home Network 1 (273): 192.168.1.1 ~ 192.168.1.63                     

  Virtual Home Network 2 (283): 192.168.1.65 ~ 192.168.1.254

Home Agent IP: 192.168.1.1

The routing table of the slave-side router 1 271 is

  192.168.1.1 255.255.255.64 Virtual Interface 2 (VIF2)

  192.168.1.65 255.255.255.64 Virtual Interface 1 (VIF1)

The routing table of router 3 250 is

  192.168.1.1 255.255.255.64 150.150.1.1

  192.168.1.65 255.255.255.64 150.150.1.2

On IP network 260,

  IP address of Router2 (272) on master side: 150.150.1.1/24

  IP address of Router2 (282) on the slave side: 150.150.1.2/24

  Router 3 (250) 's IP Address: 150.150.1.3/24

Becomes the same as

Then, as illustrated in FIG. 4, the controller 290 detects the reboot of the master and adds routing information of the master router 2 272 to the router 2 282 of the slave (S41 to S42).

The router 2 282 on the slave side transmits the changed routing information to the router 1 281 through the virtual interface 1 VIF1 according to the set routing algorithm (S43).

Router 1281 on the slave side informs the router 3250 of the routing information. At this time, the routing information of the router 3 250 will be changed from 192.168.1.1 255.255.255.64 150.150.1.1 to 192.168.1.1 255.255.255.64 150.150.1.2 (S44 to S45).

As a result, the slave operates as a master and provides not only the routing information of the virtual home network previously serviced by the slave but also all of the routing information served from the problematic virtual home network (S46).

Here, the master and slave settings are convenient. Even if a problem occurs in the interface board operating in the slave mode, the master may operate to receive the routing information of the corresponding slave side and perform the routing process. The database that manages mobile IP registration information is shared by both the master and the slave, even if it is not its own virtual home network, during the registration process.

Conventionally, redundancy processing is performed by allocating a reserve resource for redundancy and replacing it when a problem occurs. However, in the present embodiment, a redundancy function is processed while performing a normal operation using the characteristics of a home agent managing a virtual home network. Do it.

Therefore, while the efficiency of resource operation is degraded due to the conventional reserve resources, the application of the present embodiment does not require a separate reserve resource by allowing another board to perform a role of a problem board when a problem occurs while performing a normal operation. This will allow the resource to be used efficiently.

In this normal state, the two boards divide the functions so that the efficiency of resource management and the load of the processor can be balanced. In addition, the two boards perform their own functions in separate states, so that if one board fails, the other board is independent of the problem.

The embodiments described above are within the scope of various changes, modifications, and equivalents of the present invention. Therefore, the present invention is not limited to the description of the examples.

According to the network interface redundancy apparatus and method thereof of the virtual home network of the present invention, a plurality of boards can divide and execute interface functions in a normal state by providing a network interface that is redundantly operated, thereby improving the efficiency of resource management and The load can be distributed, and each interface board performs its own function in a separate state, so that even if a problem occurs in one board, the other board is independent of the problem and can perform the interface function of another board. It becomes possible.

Claims (5)

A controller configured to manage a binding table of the mobile node and resources and states of each network interface unit, detect a problem state of the network interface unit, and transfer routing information of the interface unit to a normally operating interface unit; It selectively operates in master and slave mode to route datagrams between mobile nodes and public network hosts.In case of a problem in interface part that operated as master while operating in slave mode, it receives routing information of the interface part. A plurality of network interface units adapted to serve together with routing information; Routing means for routing between the IP network and the public network with routing information, and if the routing information of the network interface unit is changed to include routing means for updating the routing information of its own; Interface redundancy unit. The method of claim 1, wherein the network interface unit, The mobile node allocated to the mobile node is divided and managed together with other network interface units in a normal state, and manages routing information of the mobile IP managed by the corresponding interface unit under control of the controller when a problem occurs in the other network interface units. A virtual home network configured to perform routing processing for the network; First routing means, adapted to take over the IP network and carry out routing processing with a physical mobile IP; A second routing means adapted to provide a virtual interface without having a mobile IP by being bitten by the first routing means and the virtual home network, A virtual interface is provided between the first routing means and the second routing means, between the first routing means and the second routing means of the other network interface portion, and between the second routing means and the first routing means of the other network interface portion, respectively. Network interface redundancy device of the virtual home network, characterized in that formed. Detecting, by the controller, a problem situation by monitoring an operation state of the plurality of network interface units; If a problem situation is detected in any one of the network interface unit, transmitting, by the control unit, routing information of the corresponding network interface unit to a normally operating network interface unit; And when the routing information of the network interface unit having the problem situation is transmitted, notifying the routing information to the external routing means located between the public network and the IP network. Network interface redundancy method. The method of claim 3, wherein If each network interface unit operates normally, if the destination of the packet is a home agent IP or a virtual home network, routing means having a virtual interface through a routing means having a physical interface of the corresponding network interface unit by an external routing means adjacent to the home agent. Network interface redundancy method of the virtual home network, characterized in that to be delivered to. The method of claim 3, wherein when the controller detects a problem situation of the network interface unit, The control unit adding routing information of the network interface unit in which the problem situation occurs to routing information of the network interface unit in normal operation; If the routing information is added, transmitting the added routing information to the external routing means together with the routing information that the network interface unit normally operates; And changing the routing table information by the external routing means receiving the changed routing information to reflect the routing information.

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