JPH07202943A - Network interface selecting system - Google Patents

Abstract

PURPOSE:To enable selection processing without impairing the problem of security by selecting the interface of a low load out of interfaces capable of adopting the selection of a network interface. CONSTITUTION:When a network address is inputted, an entry corresponding to the network address is retrieved from a network address managing table 11. When there is no correspondent network address, the entry of a non-defined address is used. Next, pointers of the interface addresses of that entry are inspected from an interface address (0) up to (N-1) and in the case of NULL, Slip is executed, and when an interface managing table 12 is indicated, the interface active in status and lowest in use frequency is selected. Finally, '1' is added to the use frequency of that interface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network interface selecting system for selecting a network interface based on a network address in a computer system having a plurality of network interfaces.

[0002]

2. Description of the Related Art In a computer system having a plurality of network interfaces, a system for selecting a network interface has route information to a communication partner network as seen in UNIX system, and a network interface is selected based on the route information. There is a system to do. Further, as an extension of the system, there is a method of exchanging route information to a target network in each computer system, dynamically changing the route information, and selecting a network interface.

In the technique described in Japanese Patent Application Laid-Open No. 02-288637, the route of the data flowing in the network system is dynamically selected at each communication node, so that even if a line failure occurs during communication, the route can be easily bypassed. The route can be set.

In the technique described in Japanese Patent Application Laid-Open No. 01-190046, in response to the notified network connection probability request, a route to a corresponding destination is referred to by referring to the route search structure table of the node that has received the notice. , Or finding a route directly to the destination accommodating node facilitates shared management of route information.

[0005]

[Patent Document 1] Japanese Patent Application Laid-Open No. 02-2886
In the technique described in Japanese Patent Laid-Open No. 37-37, and Japanese Patent Application Laid-Open No. 01-190046, the route is determined by the information of the external system. It becomes possible and there is a problem that security is greatly impaired.

Further, the techniques disclosed in Japanese Patent Laid-Open No. 02-288637 and Japanese Patent Laid-Open No. 01-190046 have a table for managing the status and load status of the own system, although the measures against the failure of the external system can be solved. Since it does not exist, it does not solve the failure countermeasures and load balancing of the own system.

Both are problems in a large-scale centralized processing system.

According to the present invention, in order to solve the above problems,
The purpose is to keep all the information for network interface selection under the control of its own system.

[0009]

In the network interface selection system of the present invention, a network address management unit capable of defining a plurality of network addresses and network interfaces corresponding thereto, and a network indicated by the address from the network address management unit. An interface management unit that manages the state of the interface and the frequency of use, and a network that selects an available and infrequently used network interface from the network interfaces in the interface management unit indicated by the address from the network address management unit. It is equipped with an interface selection unit, and the interface with the lowest load is automatically selected from the available interfaces for network interface selection. To.

[0010]

An embodiment of the present invention will now be described in detail with reference to the drawings.

The system to which the present invention is applied is connected to M networks as shown in FIG.
It is a computer system having N network interfaces. The administrator of the computer system considers the reliability and load of the network and decides the network interface to be assigned to each network. Based on the information, the computer system creates a table as shown in FIG. The network address management table 11 shown in FIG. 2 is composed of network addresses 0 to M−1 and a total of M + 1 entries of undefined addresses. Each entry of the network management table has a pointer to the network interface management table 12 from the network interface 0 to the network interface N-1, and if the network interface is assigned to the network, points to the address of the network interface. Otherwise, it points to that NULL pointer. The network interface management table 12 manages the status and frequency of use of network interfaces. The status has three values: active, inactive, and fault. As the frequency of use, the number of connections is stored during connection with that interface.

The operation of the network interface selection system, which is an embodiment of the present invention when the network is actually connected, will be described in detail with reference to FIG. Referring to FIG. 3, first, when a network address is input (step 1), the network address management table 1
From 1, the entry corresponding to the network address is searched. If there is no corresponding network address, the entry of the undefined address is used (step 2). Next, the interface addresses (0) to (N to 1) of the entry are inspected,
If it is NULL, SKIP is performed, and if it points to the interface management table 12, the interface whose status is active and whose frequency of use is the smallest is selected (step 3). Finally the frequency of use of that interface is 1
It is increased (step 4).

[0013]

As described above, according to the present invention, a plurality of network interfaces can be defined for one network address, and when one network address is designated, it is defined for that network address. By selecting evenly the network interfaces that are in the active state and not in the fault state from among the defined network interfaces, and perform the same selection method for undefined addresses,
The network interface selection process can be carried out by solving the problems of failure countermeasures and load balancing without compromising security problems.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a computer system including an embodiment of the present invention targeted by the present invention.

FIG. 2 is a diagram showing a table used in an embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the embodiment of the present invention.

Claims (1)

[Claims] 1. In a network interface selection system for a computer having a plurality of network interfaces, a network address management unit capable of defining a plurality of network addresses and corresponding network interfaces, and a network indicated by the addresses from the network address management unit. An interface management unit that manages the status and frequency of use of the interface, and a network interface that selects a usable and infrequently used network interface from the network interfaces in the interface management unit indicated by the address from the network address management unit A network interface selection system comprising: a selection unit.