JPS61172458A - Packet transmission control system - Google Patents

Abstract

PURPOSE:To suppress rapid increases in traffic in a network at generation of restart by adding a list of numbers of an exchange node device in which opposite terminal devices are accommodated in a terminal communication state display table and adding a function generating a packet as a lumped packet. CONSTITUTION:When a packet transmission control section 2 in an exchange node device 1a detects that a restart packet 11 is received from a restart logical channel 8 of a packet form terminal device 7, a lumped packet processing section 16 is started. The lumped packet processing section 16 refers to numerical information of an information storage section 17 added to a terminal communication state display table 3 to generate a lumped packet 18 having numbers of opposite terminal devices 10a, 10b as in-packet information to an exchange node device 1b accommodating the opposite terminal device and the lumped packet 18 having numbers of opposite terminal devices 10c, 10d as the in-packet information to the exchange node device 1b accommodating the opposite terminal device. Then a packet relay control section 4 selects a packet transmission line 6 by using a destination exchange node number and transmits the data through the line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packet transmission control method in a switching node device of a packet switching network, and a packet transmission control method when a %-start parallel occurrence occurs.

[Conventional technology]

FIG. 3 shows functional modules of a switching node in a conventional packet switching network. In FIG. 3, 1 is a switching node device;
2 is a packet transmission control unit, 3 is a terminal communication status display table referred to by the packet transmission control unit 2, 4 is a packet relay control unit, 5 is a terminal line, and 6 is a switching node device other than the switching node device (not shown). It is a packet transmission path that connects the

Further, FIG. 4 shows an example of a connection form of a packet switching network in which a plurality of switching node devices 1a to 1e are connected by a packet transmission line 6. In Figure 4, 1a, lb, lc, l
d and le are exchange node devices having the same structure as the exchange node device l in FIG. 3; 7 is a packet-type terminal accommodated in the exchange node device 1a; 8 is a logical channel for restarting the packet-type terminal; 9a , 9b, 9c19d are the logical channels in communication of the packet type terminal 7, and 10
a is a counterpart terminal accommodated in the exchange node device 1b with which the packet type terminal 7 is communicating using the logical channel 9a, and 10b is a partner terminal with which the packet type terminal 7 is communicating using the logical channel 9b.
10c is a counterpart terminal accommodated in the switching node device IC with which the packet type terminal 7 is communicating using the logical channel 9C; 10d is the counterpart terminal accommodated in the switching node device IC with which the packet type terminal 7 is communicating using the Switching node device 1cK in which packet type terminal 7 is communicating using logical channel 9d
The other terminal to be accommodated, 11 is a restart request packet,
12 is an intra-network reset request packet, 13 is an intra-network recovery request packet, 14 is a restart instruction packet, and 15 is a disconnection instruction packet.

Next, a conventional packet transmission control method when a glue start procedure occurs will be explained using FIGS. 3 and 4.

The exchange node device 1a has the following information in the terminal communication status display table 3:
The numbers of the logical channels 9a to 9d used by the packet type terminal 7 that it accommodates, and the numbers of these logical channels 93 to 93.
9d-compatible partner terminals 103 to 10d and the identification of whether these logical channels 9a to 9d are virtual calls or permanent virtual circuits are displayed. The switching node device 1a detects in the packet transmission control unit 2 that the serial start request packet 11 has been received through the logical channel 8 for packet type terminal free start, and refers to the terminal communication status display table 3 to send information to all parties. Virtual virtualization for terminals 10a to 10dK
If it is a call, an intra-network recovery request packet 13 is created, and if it is a permanent virtual circuit, an intra-network reset request packet 12 is created. Next, the packet relay control unit 4 selects the packet transmission path 6 based on the destination switching node number attached to the beginning of the intra-network recovery request packet 13 or the intra-network reset request packet, and sends it out.

Switching node equipment 1d, l serving as a relay station for the intra-network recovery request packet 13 or the intra-network reset request packet 12
At e, the relay control unit 4 looks at the destination switching node number, selects the packet transmission path 6, and sends the packet.

In the switching node equipment 1b, lc that accommodates the partner terminals 108 to 10d of the packet type terminal 7, the intra-network recovery request bucket)B or the intra-network reset request packet 12 received by the relay control unit 4 is sent to the switching node equipment 1b or lc of the packet type terminal 7. After detecting that the packet is addressed to lc, the packet is passed to the packet transmission control unit 2. Then, the packet transmission control unit 2 generates a recovery request packet 15 or a reset request packet 14 from the intra-network recovery request packet 13 or the intra-network reset request packet 12 and sends it to the terminal line 5.

[Problem that the invention seeks to solve]

In the conventional packet transmission control method as described above, when a restart procedure occurs, intra-network recovery request packets or intra-network reset request packets are sent within the network as many times as the number of logical channels in communication of the terminal where the restart procedure occurred. %, when a restart procedure occurs on a packet type terminal that communicates with many terminals at once, such as a host computer, the traffic within the network increases rapidly and network congestion occurs. In addition, the load on relay switching node equipment and switching node equipment accommodating partner terminals becomes high, making it easy to cause equipment congestion.

This invention was made in order to solve the above-mentioned problems, and it also prevents the traffic within the network from increasing rapidly even if a restart procedure occurs. The purpose of this invention is to provide a packet transmission control system that reduces the load on switching node devices that accommodate terminals and switching node devices that act as relays.

[Means for solving problems]

In the packet transmission control method according to the present invention, an information storage section for storing the number and number of switching node devices that accommodate partner terminals is added to a terminal communication status display table in the switching node device, and a packet transmission control section includes A batch packet processing unit is added that refers to the numerical information in the information storage unit and creates a batch packet having a destination terminal number as information in the packet, and when this batch packet is received, the information written in the batch packet is added. A disconnection instruction packet or a reset instruction packet is sent to each terminal line by referring to the terminal number of the other party.

[Effect]

The packet transmission control method in this invention creates only one batch of packets for each switching node device that accommodates the other party's terminal, so when a restart occurs, the traffic within the network increases rapidly. In addition, the amount of packets that must be processed by the packet relay control unit in the switching node device can be reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, numerals 1 to 6 are the same or equivalent parts as the conventional one. 16 is a batch packet processing unit added as an additional function to the packet transmission control unit 2; 17 is an information storage unit added to the terminal communication status display table 3.

Further, FIG. 2 shows an example of a connection form of a packet switching network in which the switching node devices 1 shown in FIG. 1 are connected by a plurality of packet transmission lines 6. In the figure, la~le% 7% 8%
9a to 9d, 10a to 10d, 11, 14, and 15 are the same or corresponding parts as those in FIG. Reference numeral 18 is a collective packet addressed to the switching node devices 1a to 1e, which has a partner terminal number (numerical information) as information within the packet.

A packet transmission control method according to the present invention will be explained using FIGS. 1 and 2. In the switching node device 1a, when the packet transmission control unit 2 detects that the serial start request packet 11 has been received from the restart logical channel 8 of the packet type terminal 7.

The batch packet processing unit 16 is activated. The batch packet processing unit 16 refers to the numerical information in the information storage unit 17 added to the terminal communication status display table 3, and sends the packet information to the other party terminal 10a addressed to the exchange node device lb that accommodates the other party terminal.
, lOb (numerical information) is similarly addressed to the exchange node device IC, and a batch packet 18 having the number of the destination terminal 10C%10d is created as information in the packet. Next, the packet relay control unit 4 selects the packet transmission path 6 based on the destination switching node number and transmits the packet. Therefore, while the number of packets processed by the relay control unit 4 was four in the conventional method, it is only two in the method according to the present invention.

In the switching nodes lb and 1c that accommodate the partner terminals 10a to 10d of the packet type terminals, the relay control unit 4 detects that the received batch packet 18 is addressed to its own switching node device 1bj or IC, and then transfers the received batch packet 18 in a batch. Packet processing unit 1
Pass it to 6. In the batch packet processing unit 16, batch packet 1
8, refer to the partner terminals 10a, 10b or 10c, 10d of the packet form terminal f, and send virtual information to the terminal line 5 of each companion terminal 10Jl to 10d.
If it is a call, the disconnection instruction packet 14 is sent as a permanent call.
If it is a virtual circuit, reset instruction packet 1
Send 5.

〔Effect of the invention〕

As explained above, this invention adds a list of the numbers and numbers of switching node equipment that accommodates the other terminal to the terminal communication status display table in the switching node equipment, and adds a function to create a packet called a batch packet. The simple structure has the excellent effect of suppressing a sudden increase in traffic within the network when a restart occurs.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of a switching node device that implements a packet transmission control method according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a packet switching network to which the packet transmission control method according to the present invention is applied, and FIG. FIG. 4 is a functional block diagram of a switching node device to which a conventional packet transmission control system is applied. FIG. 4 is a configuration diagram of a packet switching network to which a conventional packet transmission control system is applied. In the figure, 1.1a to 1e are exchange node devices, 2 is a packet transmission control unit, 3 is a terminal communication status display table, and 7
9a to 9d are logical channels, 10a to 10d are partner terminals, 16 is a batch packet processing unit, 17 is an information storage unit, and 18 is a batch packet. In each figure, the same reference numerals indicate the same or corresponding parts. Patent applicant: Mitsubishi Electric Corporation (2 others); Continued from page 1; Inventor: Makoto Koshino 36 Kamimachiya, Kamakura City Mitsubishi Electric Corporation Information and Electronics Research Laboratory procedural amendment (voluntary)

Claims (1)

[Claims] In a packet transmission control method in which packet transmission is controlled between a plurality of switching node devices provided in a packet switching network, a partner terminal is stored in a terminal communication status display table provided in each of the plurality of switching node devices. An information storage unit that stores numerical information regarding the exchange node device is added, and a batch packet processing unit that creates information in the packet by referring to the numerical information is added to the packet transmission control unit, and the data is transmitted between the terminals. When a start procedure occurs, transmitting a batch packet from the batch packet processing unit of the switching node device that has occurred at the time of occurrence to the switching node device accommodating the partner terminal, notifying that the restart procedure has occurred; The switching node device that receives this bulk packet initiates a call disconnection procedure in the case of a virtual call, or a reset procedure in the case of a permanent virtual circuit, for the logical channel corresponding to the packet type terminal that generated the restart procedure. A packet transmission control method characterized by: