JPH04252537A - Communication processing unit - Google Patents

Abstract

PURPOSE:To relieve the load on a resource of a host computer by allowing all communication processing units to manage a network corresponding to an opposite computer system. CONSTITUTION:When the necessity of communication with opposite computer system takes place in an AP 111 of its own station, a session management means 112 of a host computer system 11 publicates a session establishment request to a communication processing unit 12. A session management means 121 selects a network having a same name as a network name corresponding to a network address of the noticed opposite computer system and gives the network name. A network management means 122 establishes a logic link 131 with the opposite computer system. The session management means 121 relates a logic link 131 to the host computer system and the session 221 and informs the end of session establishment to the host computer system 11.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention is applied to a communication processing device interposed between a host computer system and a packet switching network. In a system that has multiple networks and a partner computer system exists on each network, there is a selection means for selecting a network for each partner computer system, and a method for securing a normal line from the lines joining the network when a line failure occurs. This invention relates to failure recovery means for making connections.

0002

[Prior Art] In the conventional example, when selecting a network for each target computer system, the communication processing unit did not have means for controlling the network corresponding to the target computer system. The existing network was managed and a session establishment request was made to the communication processing device, being aware of the network between the communication processing device and the other computer system. Additionally, if a failure occurs in the network between the communication processing device and the other computer system, the host computer system is aware of the network in which the failure has occurred and requests the communication processing device to recover from the failure. Ta.

0003

[Problem to be Solved by the Invention] Conventionally, when controlling a network on a per-party computer system basis, the host computer has a network management function between a communication processing device and a destination computer system, and a network-level failure recovery function. Since it was necessary to provide functions, there was some ambiguity in the division of functions between the host computer system and the communication processing device. Furthermore, since the network management function and failure recovery function are processed on the host computer, there is a possibility that the resource load on the host computer system will increase.

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks, and aims to provide a communication processing device that performs all of the management of a network corresponding to a partner computer system.

[0005]

[Means for Solving the Problems] The present invention provides a system in which a partner computer is connected to each of a plurality of networks consisting of connected packet switching networks via subscriber lines, and is also physically linked to a host computer. In the communication processing device, a logical link is established between a session management means having a selection means for selecting a network specified by the session establishment request from the host computer and a subscriber line connected to the network selected by the selection means. a network management means having a link establishment means and a logical link notification means for notifying the session management means of the logical link established by the link establishment means, and the session management means is notified from the logical link notification means. The present invention is characterized by comprising session establishment completion notification means for associating a logical link with a session from the host computer and notifying the host computer of the completion of session establishment.

[0006] Further, the network management means has a detection means for detecting a fault in a subscriber line connected to the network selected by the selection means, and the link establishment means has a detection means for detecting a fault in a subscriber line connected to the network selected by the selection means, and the link establishment means detects a fault in the subscriber line connected to the network selected by the selection means. It is desirable that the configuration is such that a logical link can be established to one of the subscriber lines other than the subscriber line.

[0007]

[Operation] In response to a session establishment request from the host computer system, the network to which the desired partner computer belongs is selected, a logical link is established on the appropriate subscriber line connecting this network to the communication processing device, and this After associating logical links with sessions, the host computer system is notified of session establishment completion.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of this embodiment, and FIG. 2 is a control structure diagram of sessions, logical links, and communication lines within the system.

As shown in FIG. 1, the host computer system 11 connects a network named A (hereinafter referred to as network A) and a network named B (hereinafter referred to as network B) via the communication processing device 12. has joined. The partner computer systems exist in network A and network B, and the host computer system 11 and the partner computer system 1B can be connected through communication lines 13, 14, and 15, and the host computer system 1
1 and the counterpart computer system 1C can be connected through communication lines 16, 17, and 18. At this time, the communication processing device 12 accepts a session establishment request from the host computer system 11, selects a network corresponding to the other computer system using the network name as a key, performs processing such as failure recovery, and then establishes proper communication within the network. Establish logical links using lines.

That is, in this embodiment, as shown in FIG. 1, a network A (B) consisting of a packet switching network 19 (1A) to which a partner computer system 1B (1C) is connected
subscriber lines 13 to 15 (16 to 1
8) and is also connected via the host computer system 11
a session management means 12 connected to the host computer system 11 via a physical link 22 and having a selection means for selecting a network specified by a session establishment request from the host computer system 11;
1 and network A (B) selected by this selection means.
), and a logical link notification means for notifying the session management means 121 of the logical link established by the link establishment means. The session management means 121 associates the logical link notified from the logical link notification means with the session from the host computer system 11 and notifies the host computer system 11 of completion of session establishment. It has a session establishment completion notification means. Furthermore, the network management means 122
It has a detection means for detecting a fault in a subscriber line connected to the network selected by the selection means, and the link establishment means is one of the subscriber lines other than the subscriber line for which a fault has been detected by the detection means. This is a configuration that allows logical links to be established.

Next, the operation of this embodiment will be explained based on FIG. First, the communication processing device 23 gives network names to the networks under its control when loading from the host computer, and links subscriber lines belonging to each network. Furthermore, the name of the network where the other computer system exists is assigned to each network address of the other computer system. The session management means 112 of the host computer system 11 issues a session establishment request to the communication processing device 12 when it becomes necessary for its own AP 111 to communicate with a partner computer system. Upon receiving the request, the session management means 121 of the communication processing device 12 selects a network having the same name as the network name corresponding to the network address of the partner computer system notified from the host computer system 11, assigns the network name, and Network management means 12
Transfer control to 2. The network management means 122 selects the communication line 13 from among the communication lines 13, 14, and 15 to which the network having the notified network name belongs, establishes the logical link 131 with the partner computer system, and establishes the logical link 131 with the other computer system. The completion of establishment is notified to session management means 121. The session management means 121, which has been notified of the completion of establishment of the logical link 131, connects the logical link 131 between the host computer system and the session 221.
, and notifies the host computer system 11 of completion of session establishment. Furthermore, if a failure is detected in the communication line 13 when establishing a logical link, the network management means 122 uses the communication line 14 to establish a logical link 141 with the other computer system, and the session management means Notify 121.

0012

Effects of the Invention As explained above, the present invention allows the communication processing device to manage all the networks corresponding to the partner computer system, so there is no need to manage the network on the host computer, and the resources of the host computer can be saved. It has the effect of reducing the load.

[0013] Furthermore, since the host computer only needs to be aware of the session when communicating with the other computer system, the division of functions between the host computer system and the communication processing device becomes clear, and the interface when expanding functions can be simplified. It has the effect of

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing control in the embodiment of the present invention.

[Explanation of symbols]

11 Host computer system 1
2 Communication processing device 13 or 1
8 Subscriber line

Claims (2)

[Claims] Claim 1. A communication processing device connected to each of a plurality of networks consisting of packet switching networks to which partner computers are connected via subscriber lines and physically linked to a host computer, wherein the host computer session management means having selection means for selecting a network specified by a session establishment request from; link establishment means for establishing a logical link to a subscriber line connected to the network selected by the selection means; and this link establishment means. and a network management means having a logical link notification means for notifying the session management means of the logical link established in A communication processing device comprising a session establishment completion notification means for notifying the host computer of session establishment completion in association with a session. 2. The network management means includes detection means for detecting a fault in a subscriber line connected to the network selected by the selection means, and the link establishment means detects a fault in a subscriber line connected to the network selected by the selection means. 2. The communication processing device according to claim 1, wherein the communication processing device is configured to be able to establish a logical link to one of the subscriber lines other than the subscriber line.