JPH1065725A - Router device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a router device that does not need to set different information in a working system and a standby system in a single configuration and a dual configuration. SOLUTION: A duplex configuration of an active system and a standby system is used by using two same router devices, and one line control unit is shared by the same relay processing unit of each system, and a network for a bypass route and a relay processing unit are used. Add a line controller. The management unit of each system generates routing information from the same network configuration definition information, and also generates routing information related to a network for a bypass route according to a unified rule in a duplex configuration.
The relay processing unit, when the relay processing unit that performs the relay processing of the transfer destination network is included in the other system, performs the relay processing based on the routing information about the network line for the bypass route.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a router device having a duplex configuration of an active system and a standby system and performing processing of a network layer (layer 3) between connected networks. The present invention relates to a technique for sharing network configuration definition information used for generation between a single configuration and a dual configuration.

[0002]

2. Description of the Related Art A router device connects a plurality of networks and performs a relay process on a data packet communicated between the connected networks. In the router device (single configuration) shown in FIG. 9, a LAN (local area network), W
A relay processing unit and a line control unit are individually arranged for each AN (wide area network), and the management unit manages the network configuration definition information. As a technique related to the router device as shown in FIG. 9, there is a technique described in, for example, Japanese Patent Application Laid-Open No. 5-199230.

On the other hand, two routers as shown in FIG. 9 are used to make the working system and the standby system redundant.
Consider a router device as shown in FIG. In this router device, the active system and the standby system are connected by a LAN for a detour path having a unique network address, and when a failure occurs in the relay processing unit of the active system, the processing of the relay processing unit is performed by the standby system. In the same kind of relay processing unit. The management units individually arranged in the active system and the standby system individually manage and operate the network configuration definition information.

In FIG. 10, a path 1 (broken line) indicates a communication path when all relay processing is performed in the active system.
The path 2 (dotted line) indicates a communication path when the processing is performed by the standby WAN relay processing unit due to an abnormality in the active WAN relay processing unit. For example, when the communication path is switched to the path 2 by the relay from the LAN to the WAN, the next hop address (address of the next transfer destination) viewed from the active device is connected from the normal destination to the LAN for the detour path. It changes to the address of the standby system device. in this way,
Since the relay route changes due to the failure of the relay processing unit and the routing information also changes, the routing information in the single configuration cannot be used as it is in the duplex configuration.

[0005] If a dynamic routing (for example, RIP: Routing Information Protocol in the TCP / IP protocol group) technique for dynamically generating, adding, changing, or deleting routing information for routing processing is used, the next hop address due to route change is used. Can respond to changes in However, in this method, a certain amount of time is required for updating the routing information, so that the time required for the path switching becomes long. In addition, there is also a problem that since information about the network is regularly exchanged, it is not suitable for a public network or the like that is charged based on the traffic volume or connection time.

If static routing is used to generate routing information in advance from registered network configuration definition information and set it in each relay processing unit, routing information at the time of route switching is also set in advance. The time to switch the route can be made faster than when using dynamic routing. However, since the active system and the standby system have different next hop addresses at the time of switching, the network configuration definition information cannot be shared. For this reason, when changing from a redundant configuration to a single configuration, the configuration definition information for the single configuration is used.When changing from the single configuration to the redundant configuration, the configuration definition information for the active system at the time of redundancy and the standby system at the time of the redundancy are changed. , Each had to be rebuilt.

[0007]

As described above, FIG.
When static routing is used in a router device with a redundant configuration as shown in (1), the same network configuration definition information cannot be used in the active system and the standby system. It had to be set individually. Similarly, when the router device is changed from a duplex configuration to a single configuration, it is necessary to change the network configuration definition information. A router device that can automatically generate routing information using the common network configuration definition information in the active system and the standby system in a single configuration and a dual configuration to reduce the workload of the administrator. Is desired.

Accordingly, an object of the present invention is to provide a router device which does not need to set different information in a working system and a standby system in a single configuration and in a dual configuration.

[0009]

In order to achieve the above object, a router according to the present invention comprises a management unit for managing routing information, and a data packet inputted according to the routing information managed by the management unit. A router device that has two sets of relay units each having a plurality of relay processing units connected to each other, one of which is a working system, and the other of which is a redundant system, which is connected to a network line. Connected to one relay processing unit of the relay unit of the active system and one relay processing unit of the standby system corresponding to the relay processing unit, and connected to the relay processing unit of the connected relay unit of the active system and the standby system. A plurality of line control units for selectively controlling one of the relay processing units of the relay unit, and controlling communication between network lines connected to the relay processing unit to be controlled; When an abnormality occurs in the relay processing unit of the relay unit, the relay processing unit to be controlled by each line control unit is changed from the relay processing unit of the active relay unit to the relay processing unit of the standby system relay unit. A switching unit for switching, wherein the relay unit of the working system and the relay unit of the standby system are respectively included in a line controller for a detour path connected to a network line for a detour path, a line controller for a detour path, and the relay unit. A relay processing unit for a bypass route connected to the relay processing unit, wherein each management unit of the working system and the standby system relay unit is related to the network circuit for the bypass route based on a unified rule. Means for generating routing information, wherein each of the relay processing units of the active and standby relay units and the relay processing unit for the detour path follow the routing information related to the network line for the detour path, and And performing relay processing so as to bypass the relay processor of the relay of a standby system that occurs.

In the router device of the present invention, in the duplex configuration, the relay unit having the same configuration is duplicated as the working system and the standby system, and each line control unit connected to the external network line has a corresponding relay processing unit. Are connected, the network configuration is the same as seen from the management unit of each system. In addition, the relay unit of each system generates routing information on the added detour route network line based on the rules unified by both systems, and the relay processing unit of the next transfer destination relays the relay system of the other system due to an error. When it becomes a processing unit, it performs a relay process in accordance with the routing information relating to the network line for the bypass route. Therefore, in the router device of the present invention, it is not necessary for the administrator to set different information (routing information and network configuration definition information) in the active system and the standby system in the single configuration and the dual configuration. In the router device of the present invention, a plurality of line control units can be connected to one relay processing unit.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration of a router device having a single configuration according to the present embodiment. In the figure, the router device has a router management unit 30, a disk device 31, relay units 32 and 33, and line control units 34 and 35. The management unit 30 has a main processor, manages the entire router device, and creates a routing table from network configuration definition information. The routing table contains the TCP / IP protocol I
A P address and the like are set. The management unit 30 has a function of automatically recognizing the configuration of its own device (single configuration, duplex configuration, active / standby system) from the hardware configuration when starting up the hardware. Each of the relay processing units 32 and 33 has a processor that performs a relay process, and performs a relay process of a network layer (layer 3) on a transmitted packet. The routing table created by the management unit 30 is used for this relay processing. The line controllers 34 and 35 control communication between the relays 32 and 33 and the network. Here, for example, the line control unit 34 operates as follows.
A port for controlling a dedicated line of a WAN having a transfer rate of 5 Mbit / sec, and a line control unit 35 are connected to a CSMA / CD (Carrie
r Sense Multiple Access with Collision Detection)
It is a LAN port that controls the line in the system.

The management unit 30 reads network configuration definition information from the disk device 31 and creates a routing table for relay processing. In the present embodiment, only the static routing is used to create the routing table. The network configuration definition information includes, in addition to the information on the own router device, the information on the connected network, and the information on the route control, which are the information at the time of the unified configuration, the information of the network added as the bypass route in the duplex configuration Information is included. Management unit 3
0, the routing table created by the router bus 3
1 to each of the relay processing units 32 and 33. The relay processing units 32 and 33 relay the packet based on the information of the routing table sent. Line control unit 34,
35, the relay processing unit 32,
Data transfer is performed between the routers 33 via the router bus 31.

FIG. 2 shows a configuration of a router device having a duplex configuration according to the present embodiment. This router is realized by using the two routers of FIG. 1 as an active system 407 and a standby system 408, respectively.

The active system 407 has a LAN for the bypass route.
A relay processing unit 403 and a LAN line control unit 405 are provided.
04 and a LAN line control unit 406 are provided. The LAN line controllers 405 and 406 for the detour routes are FDD
They are connected by an I (Fiber Distributed Data Interface) 415. The management terminal 420 is also connected to the FDDI 415. Other LAN relay units 409 for the active system and the standby system,
411 is connected to a LAN line controller 415 connected to an external network via the switching device 402. Similarly, the active and standby WAN relay units 41
0 and 412 are connected to a WAN line control unit 416 connected to an external network via the switching device 401. The switching devices 401 and 402 have a function of monitoring a failure in the active relay processing unit and switching to a standby relay processing unit when a failure is detected.

The relay processing units 409 and 410 of the active system 407
Is normally operating, the switching device 402,
Reference numeral 401 connects the active relay processing units 409 and 410 to the line control units 415 and 416, respectively. Also,
The standby system 408 is in a standby state at this time. For example, if communication is performed between a host of the LAN 414 and a host of the WAN 413, the communication path between the hosts at this time is 413-401-410-409-402-.
The route 414 is taken. Active WAN relay processing unit 4
When a failure occurs in the switch 10, the switching device 401 that has detected the failure switches the relay processing unit connected to the WAN line control unit 416 from the active WAN relay processing unit 410 to the standby WAN relay processing unit 412. . Thereby, the communication path between the hosts is 413-401-411.
−404−406−407−405−403−409−
The path becomes 402-413.

Next, how the routing process of the router changes between the single configuration and the dual configuration will be described with reference to FIGS.

In the network shown in FIG.
4 and the host 505 are the router devices 503, 501, and 50.
2 are connected. The router device 501 is configured as shown in FIG.
And has two interfaces (communication control units) 506 and 507. “1” is assigned to interface 506, interface 5
07 is assigned an interface number of “2”. When viewed from an external network, an IP address of “158.214.172.1” is assigned to the interface 506, and an IP address of “158.214.174.1” is assigned to the interface 507.

In this network configuration, the host 5
When a static route is set so that communication can be performed between the host device 505 and the host 504, the routing table generated by the router device 501 is as shown in FIG. As shown in the figure, the routing table is set with routing information including a destination address indicating a destination, a next hop address indicating a next transfer destination, and an interface number of an interface of the own device that transmits data. The destination address and the next hop address are IP addresses, and are specified by a network address and a host address. A similar routing table that enables communication between the host 505 and the host 504 is also set in the router devices 502 and 503.

The router 501 relays a packet according to the routing table shown in FIG. When a packet is input, the router 501 refers to the destination address of the input packet and specifies the next hop address and interface number corresponding to the destination. Then, the packet is transmitted from the specified interface to the router device having the specified next hop address.

FIG. 5 shows a case where the router device 501 in FIG. 3 has the duplex configuration described in FIG. In FIG.
The active system 703 and the standby system 704 constituting the duplicated router device include the interface 506 and the interface 506 described in FIG.
507 is shared. In addition, the active system 703 and the standby system 704
Are the added interfaces 703 and 70, respectively.
4 is connected to the FDDI for the detour route. An interface number of “3” is assigned to the added interfaces 703 and 704. In this case, the routing tables of the active system 703 and the standby system 704 need to be changed to the contents shown in FIGS. 6 and 7, respectively. 6 and 7 are different from FIG.
Routing information indicating a route in a single configuration (item number 1,
3, 5, 7) is added with routing information (item numbers 2, 4, 6, 8) indicating a detour path at the time of switching the relay processing unit. Each of the relay processing units of the active system 703 and the standby system 704 performs routing information indicating a detour route only when a relay processing unit that is a next transfer destination of a packet input from the communication control unit is a relay processing unit of another system. The packet is delivered according to the following.

The routing table of the active system 703 (FIG. 6) and the routing table of the standby system 704 (FIG. 7)
The only difference is that the next hop address of the bypass route routing information is different. The routing information for the bypass route is different from the routing information in the unified configuration in that the network information of the bypass route FDDI and
It can be obtained by performing a change using the host address of another system connected by the bypass route FDDI and the interface number of the communication control unit. In this embodiment, fixedly,
The host address of the active system is “1”, the host address of the standby system is “2”, the interface numbers of the two interfaces for the bypass route are “3”, and the bypass route FDDI
Is fixed, so that routing information for a detour route can be automatically generated.

FIG. 8 shows the flow of processing of the management unit from the start of the apparatus to the creation of a routing table.

When the apparatus is started up, the management unit first detects whether or not the management terminal 420 is connected, and determines whether the apparatus is in a single configuration or a dual configuration (S1). In the case of a single configuration, a routing table in the format of FIG. 4 is created from the network configuration definition information (S7), and the created routing table is distributed to each relay processing unit (S1).
0). In the generation of the routing table here, the information on the network for the detour route included in the network configuration definition information is ignored.

On the other hand, in the case of the duplex configuration, it is determined whether the own device is the active system or the standby system (S2), and if it is the active system, the host address of the own device is set to "1".
(S3), and if it is a standby system, the host address of its own device is set to "2" (S4). By combining the set host address and the network address of the bypass route preset in the configuration definition information, the IP address of the own device connected to the bypass FDDI is determined (S5). Then, the determined IP address is assigned to the interface having the interface number “3”, which is connected to the FDDI for the bypass route. next,
A routing table is created from the same network configuration definition information as in the single configuration (S7), and an entry in which the next hop address of each piece of routing information is changed to the IP address of the other device is added to the created routing table. This creates a routing table in the format of FIG. 6 (S9). Finally, the created routing table is distributed to each relay processing unit (S10).
Here, the IP address of the other device is obtained by replacing the host address of the IP address of the own device from “1” to “2” or vice versa. Note that, even when the router device having the duplex configuration is changed to the single configuration, the routing table is created from the same network configuration definition information by the above processing.

As described above, in the router of the present embodiment, by performing the processing shown in FIG. 10, the same network configuration definition information can be used in the simplex configuration and the duplex configuration. The same network configuration definition information can be used for both the active system and the standby system during configuration. This makes it possible to automatically set a complicated static route that changes depending on the configuration without updating the network configuration definition information by the user.

The present embodiment is also applicable to a router device for connecting an arbitrary number of networks of any type by providing a relay processing unit, a communication control unit, and a switching device corresponding to the type of network to be connected. it can. Further, a plurality of line controllers connected to a relatively low-speed network may be connected to one relay processor, and one relay processor may process packets of a plurality of networks. Further, the determination of the single configuration or the double configuration may be performed according to a command transmitted from the management terminal 420 or a setting state of a switch in which the configuration of the router device is set.

[0028]

According to the present invention, it is possible to provide a router device which does not need to set different information in the active system and the standby system in the single configuration and the duplex configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram of a router device having a single configuration according to an embodiment of the present invention.

FIG. 2 is a block diagram of a router device having a redundant configuration according to the embodiment of the present invention.

FIG. 3 is a diagram of an example of a network configuration using a router device having a single configuration.

FIG. 4 is a diagram showing a routing table of the router device 601 in FIG.

FIG. 5 is a diagram when the router device 601 in FIG. 3 has a duplex configuration.

FIG. 6 is a diagram showing a working routing table of FIG. 5;

FIG. 7 is a diagram showing a standby routing table of FIG. 5;

FIG. 8 is a flowchart showing a flow of processing of a management unit for creating a routing table.

FIG. 9 is a block diagram of a conventional router device having a single configuration.

FIG. 10 is a block diagram of a router device having a duplex configuration in which the relay processing unit is duplicated by using two units in FIG. 9;

[Explanation of symbols]

 Reference Signs List 30 management unit in router device 31 disk device 32 relay processing unit 34 line control unit 36 router bus 401 relay processing unit switching device 407 active router device 408 standby router device 413 WAN line 414 LAN line 415: FDDI for detour route 504: Terminal

Claims (4)

[Claims] 1. A management unit for managing routing information, and according to routing information managed by the management unit,
Two sets of relay units having a plurality of interconnected relay processing units for performing a relay process on an input data packet, one of which is an active system and the other is a redundant router device which is a standby system. Connected to a line, connected to one relay processing unit of the relay unit of the active system and one relay processing unit of the standby system corresponding to the relay processing unit, and relayed by the connected relay unit of the active system. A plurality of line control units for selectively controlling one of the processing unit and the relay processing unit of the standby relay unit as a control target, and controlling communication between a network line connected to the relay processing unit to be controlled; When an abnormality occurs in the relay processing unit of the relay unit of the working system,
A switching unit that switches a relay processing unit to be controlled by each of the line control units from a relay processing unit of the active relay unit to a relay processing unit of a standby relay unit; and The relay unit includes a detour path line control unit connected to the detour path network line, a detour path line processing unit connected to the detour path line control unit, and a relay processing unit included in the relay unit. Each management unit of the relay unit of the working system and the protection system has means for generating routing information related to the network line for the detour path based on a unified rule, Each of the relay processing units of the standby system relay unit and the detour route relay processing unit bypasses the relay processing unit of the faulty standby system relay unit according to the routing information on the detour path network line. Router device and performing relay processing to. 2. The router device according to claim 1, wherein it is determined whether the configuration of the relay unit is a single configuration or a duplex configuration. A router having means for determining which of them is the routing information, wherein the means for generating the routing information generates routing information relating to the network line for the detour route according to the result of the determination. apparatus. 3. The router device according to claim 1, wherein the routing information is individually assigned to a network address individually assigned to each of the network lines, and to each device connected to the network line. The management unit of the active and standby relay units includes an IP address determined by a host address and an interface number assigned to the communication control unit. The management unit of the active and standby relay units communicates between the active and standby relay units. The same interface number is assigned to two line control units that enable
A predetermined network address is assigned to the bypass route network line, and the same host address is assigned to the working relay unit connected by the bypass route network line, and is connected by the bypass route network line. The spare relay unit also has means for allocating the same host address different from the host address, and the means for generating routing information, as the unified rule, when its own relay unit has a duplex configuration, An interface number of the detour path line controller, a network address of the detour path network line,
A router device, which generates routing information relating to the detour path network line using the host address of a relay unit of another system. 4. The router device according to claim 3, wherein said means for allocating a host address allocates a predetermined host address for an active system to the own relay unit when the own relay unit is an active system, and Assigning a predetermined host address for the standby system to the relay unit, and when the own device is the standby system, allocating the host address for the standby system to the own system and allocating the host address for the active system to the other system. Characteristic router device.