JP2000004250A - Switching hub controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the throughput of an entire network by temporarily stopping access to a port, which has received packets for a long time, and preferentially receiving packets at the other port. SOLUTION: Concerning this controller, control circuits 17-20, with which the transmission of packets to a client corresponding to a branch LAN is stopped by outputting a collision signal when the amount of packets inputted and stored in a plurality of ports 13-16 of a switching hub introduced to a trunk LAN bundling the branch LAN exceeds a set value, are connected to these ports 13-16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a switching hub control device for improving the throughput of the entire network by introducing a switching hub into a main LAN (backbone) that bundles branch LANs.

[0002]

2. Description of the Related Art In a conventional Ethernet, a number of terminals are connected to one network, and each terminal has a 10/100 connection.
The network is configured as a medium sharing type network sharing a Mbps bandwidth. In such a network,
Only one terminal can communicate at a time, data is sent to all terminals at once, and the network throughput decreases as the number of connected terminals and the amount of data to be sent increase. On the other hand, in recent years, the introduction of a switching hub (HUB) as a concentrator has been regarded as an effective means for solving this problem. FIG. 3 shows a network in which the switching hub is introduced. The switching hub 1 is configured as a network in which a hub (HUB) 2, a hub 3, and a hub 4, which are branch LANs, are bundled. Communication with the server 5 can be performed.

[0003]

However, in such a switching hub control method, when the communication from the client 6, the client 7, and the client 8 to the server 5 is concentrated, the switching hub has a structural characteristic. There is a problem in that the switching operation inside the switching hub 1 frequently occurs, and the throughput of the entire network decreases.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem. A receiving buffer is provided at each port of a switching hub, and while monitoring the amount of packets entering each port, the number of packets exceeding a certain amount is stored in the receiving buffer. When the signal accumulates, it sends a collision signal to that port,
Requests the client to stop sending packets, so that the port receiving the packet for a long time temporarily stops access, and instead allows other ports to receive the packet with priority, It is an object of the present invention to obtain a switching control device capable of improving the throughput of the entire network.

[0005]

In order to achieve the above object, a switching control device according to the first aspect of the present invention comprises a branch line L
Outputs a collision signal to a plurality of ports of the switching hub introduced in the main LAN that bundles the ANs when the amount of packets accumulated in the ports exceeds a set value,
A control circuit for stopping transmission of a packet to a corresponding client is connected to the branch LAN.

According to a second aspect of the present invention, in the switching control device, the control circuit compares a reception buffer holding packets entering the port with an amount of packets accumulated in the reception buffer and a set value. And a collision signal generating circuit for transmitting a collision signal to the port when the packet amount exceeds a set value as a result of the comparison by the comparator.

Further, in the switching control device according to the invention of claim 3, the set value can be arbitrarily set for each port.

According to a fourth aspect of the present invention, in the switching control device, the collision signal is input to the port prior to a packet input from a switching bus between the collision generation circuit and the port. Switch provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an internal configuration of a switching hub according to the present invention.
3, a control circuit 17, a control circuit 18, a control circuit 19, and a control circuit 20 are connected to the port 14, the port 15, and the port 16, respectively. Furthermore, each control circuit 1
7 to 20 are switching buses 2 for performing a switching operation.
1 connected. The switching bus 21 that performs this switching operation is well known by those skilled in the art and is not directly related to the present invention, so that the detailed description thereof is omitted.

Next, the details of the control circuit 17, the control circuit 18, the control circuit 19, and the control circuit 20 will be described. FIG. 2 is an internal block diagram of these control circuits 17 to 20. In addition,
Since these control circuits 17 to 20 have basically the same configuration, the control circuit 20 will be described here as an example. Reference numeral 22 denotes a reception buffer for temporarily receiving a packet received from the port 16, and reference numeral 23 denotes a comparator. The comparator 23 compares the number of packets notified from the reception buffer 22 with a set value, and the amount of packets exceeds the set value. Then, the collision signal generation circuit 24 is enabled. By changing the setting value input to the comparator 23, it is possible to control the timing of how much packets are accumulated in the reception buffer 22 before a collision signal is output.

A switch 25 receives a normal packet from the switching bus 21 and a collision signal from the collision generation circuit 24. The collision signal from the collision generation circuit 24 is It is output prior to the normal packet.
The signal from the switch 25 is connected to the port 16.

Next, the operation will be described. Now, the server is connected to port 13, and port 14, port 15, port 1
When a client or a branch LAN is connected to each of the ports 6, it is assumed that communication concentrates from the ports 14, 15, and 16 to the port 13. For example, focusing on communication from a client or a branch LAN connected to the port 16, packets received from the port 16 are stored in the reception buffer 22. At this time, the client or branch line LA
If the transmission from N takes a long time, the number of stored packets will exceed the set value. Therefore, the comparator 23 outputs a valid signal to the collision signal generation circuit 24, and in response to this, the collision signal generation circuit 24 generates and outputs a collision signal.

Therefore, the collision signal is immediately output to the port 16 via the switch 25, and as a result,
Client or branch line LA connected to port 16
N temporarily stops transmitting the packet by using a collision detection function conforming to IEEE802.3. During this time, since the switching operation (load) of the switching bus 21 is reduced, the other ports 13, 14, and 1
5 can communicate with priority. The above collision control is performed for port 13, port 14, port 15
Because each operates independently, the port that has occupied the network for a long time behaves as if it refrained from communicating on its own, and as a result, the throughput of the entire network connected to the switching hub is improved. .

[0014]

As described above, according to the present invention, when a plurality of ports of a switching hub installed in a main LAN for bundling branch LANs exceed the set value when the amount of packets accumulated in the ports exceeds a set value. Since a control circuit for outputting a collision signal and stopping transmission of packets to the corresponding client is connected to the branch LAN, when a certain amount or more of packets are accumulated in the reception buffer, the collision to the port is stopped. Send a signal,
By requesting the client to stop sending packets, the port receiving the packet for a long time is temporarily stopped from accessing, and instead the other ports are given priority in receiving the packet, and as a result, the network The effect that the whole throughput can be improved is obtained.

Further, by allowing the setting values to be set arbitrarily for each port, the network throughput can be increased only for a specific port (client or branch LAN), and as a result, the priority is given to business. There is an effect that the application to the application where the client or the branch LAN to be connected is effective becomes effective.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a switching hub according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a control circuit in FIG.

FIG. 3 is a block diagram showing a conventional general network.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switching hub 13, 14, 15, 16 Port 17, 18, 19, 20 Control circuit 21 Switching bus 22 Receive buffer 23 Comparator 24 Collision signal generation circuit 25 Switch

Claims (4)

[Claims] 1. A collision signal is output to a plurality of ports of a switching hub introduced into a main LAN that bundles branch LANs when the amount of packets stored in the ports exceeds a set value, and a collision signal is output to the branch LAN. A switching hub control device comprising a control circuit for stopping transmission of a packet to a corresponding client. 2. A control circuit comprising: a reception buffer for holding a packet entering the port; a comparator for comparing an amount of packets accumulated in the reception buffer with a set value; and a result of the comparison by the comparator. 2. The switching hub control device according to claim 1, further comprising: a collision signal generation circuit for transmitting a collision signal to the port when the packet amount exceeds a set value. 3. The apparatus according to claim 1, wherein the setting value can be set arbitrarily for each port.
3. The switching hub control device according to 1.). 4. A switch is provided between the collision generation circuit and the port, the switch for inputting the collision signal prior to a packet input from a switching bus for the port. 3. The switching hub control device according to 2.