JP3470680B2 - Bandwidth control device and traffic control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed between a backbone network typified by the Internet and a plurality of local area networks (LAN), and guarantees communication traffic of a plurality of communication terminals connected to the LAN. The present invention relates to a band control device including traffic control means for communication traffic.

[0002]

2. Description of the Related Art A conventional band control device is used, for example, in the configuration of FIG. An example of the use configuration of the bandwidth control device in FIG.
One is a backbone network line typified by the Internet (eg, 1.5 Mbit / s), and the other is a LAN line (eg, 10 Mbi) that is sufficiently high speed compared to it.
t / s), and a band control device is connected to the LAN line side of the router D connecting them. The lines to which the band control device is connected are LAN-A, LAN-B, LA
Connected via NC and HUB, LAN-A, LAN-
B, communication terminals A-1, A-2 connected to LAN-C,
A-3, B-1, B-2, B-3, C-1, C-2, C
-3 is a communication terminal E- of LAN-E that passes through the router D during communication and uses the backbone network line.
1, can communicate with E-2, E-3.

For example, the communication terminal A-1 in FIG. 1 is the communication terminal E.
If 1.5 Mbit / s is used for the communication of -1, the communication band 1.5 Mbit / s of the backbone network line, which is a bottleneck, is used 100%. Communication traffic cannot be secured due to congestion at the time of communicating with 2. At this time, the band control device can recognize that the backbone line is congested by setting the congestion detection threshold of the communication traffic passing through the band control device to 1.5 Mbit / s. For example, if the bandwidth control device has a traffic control policy that all communication terminals can equally communicate with LAN-E communication terminals using the backbone network line at the same time, the communication band of the communication terminal A-1 is set. The traffic is controlled so as to lower the bandwidth of the communication terminal A-2.

The band control device comprises communication terminals A-1, A-
2, A-3, B-1, B-2, B-3, C-1, C-
The communication traffic used by each of the terminals 2 and C-3 is identified by using a unique address possessed by each terminal, for example, an IP address or a MAC address.

Next, a wired LAN (for example, 10 Mbit /
wireless LAN (here,
FIG. 2 shows an example in which a band control device is used in a LAN configuration in which 2 Mbit / s) is connected.

In the configuration of FIG. 2, LAN-a and LAN-
b and LAN-c are different LANs, and each LA
A wireless LAN terminal a-
1, a-2, a-3, b-1, b-2, b-3, c-
1, c-2, c-3 can communicate with LAN-e communication terminals e-1, e-2, e-3 through the router e during communication.

For example, the communication terminal a-1 in FIG. 2 is the communication terminal e.
When 2 Mbit / s is used for communication with -1, 100% of the wireless LAN speed of 2 Mbit / s, which is a bottleneck, is used, so communication is performed when communication terminal a-2 communicates with communication terminal e-2. Unable to secure traffic.

In order to prevent this, a traffic control policy is set such that all communication terminals can equally communicate with LAN-e communication terminals at the same time by using the bandwidth control device, and the congestion detection threshold of the bandwidth control device is set as a bottleneck. The wireless LAN speed is set to 2 Mbit / s. Communication traffic passing through the band controller is 2 Mbit / s
When it exceeds the limit, the bandwidth control device performs traffic control of each wireless LAN terminal.

[0009]

However, when the conventional band control device is used in the configuration of FIG. 2, the band of the line which becomes a bottleneck, for example, the wireless LAN terminals a-1 of LAN-a and the wireless terminals of LAN-b. When the communication traffic of the LAN terminal b-1 exceeds 2 Mbit / s in total, there is a problem that the traffic control is activated and the communication traffic is deteriorated although the wireless LAN line is not congested.

If the configuration shown in FIG. 3 is used as a means for solving this problem, congestion can be detected for each LAN, and traffic control can be performed. Therefore, there is a problem that communication traffic is deteriorated even though the wireless LAN circuit is not congested. It can be resolved. However, since the band control device is required for the number n of LANs (n = 3 in this example), there is a problem that the cost increases.

[0011]

In order to solve the above problems, according to the present invention, a band controller inputs a packet signal.
Destination terminal for identifying the destination terminal of the packet signal
From the source terminal identifier that identifies the identifier and the source terminal
The terminal identifier of the communication terminal is extracted, and the extracted terminal identifier
And the LAN identifier of the LAN to which the communication terminal belongs
By comparing with a database consisting of
The LAN to which the receiving terminal belongs is identified and
Calculate the traffic volume per unit time, and
The amount is larger than the preset threshold for congestion detection.
If not, it is judged as being congested and the LAN identifier in congested is output.
Congestion detecting means and a LAN output by the congestion detecting circuit
The identifier and the packet signal are input, and the LAN identifier
The communication terminal belonging to the LAN indicated by is the backbone network.
The amount of traffic for packet communication via network
Traffic control means for controlling

[0012]

Further, according to the present invention, the band control device is
The communication terminal that communicates under the LAN is assigned a terminal identifier of the communication terminal and L of the LAN to which the communication terminal belongs.
The AN identifier is registered in the table, and the LAN
A threshold for detecting line congestion is registered, and the destination address of the packet signal transferred between the backbone network and the LAN and the communication terminal using the packet signal are identified from the source address. The LAN to which the communication terminal is connected is identified from the terminal identifier of the communication terminal held by the table and the LAN identifier of the LAN to which the communication terminal belongs, and the traffic per unit time is aggregated for each LAN. If the communication traffic of a certain LAN exceeds the threshold value, it is judged that the LAN is congested, and the traffic control is performed to the communication terminal connected to the LAN. If it is less than the threshold value, the traffic control is not performed. There is provided a band control method characterized by the above.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A case in which an embodiment of the invention is used in the configuration of FIG. 2 will be described.

FIG. 4 is a block diagram showing the configuration of the band control device of the present invention. The bandwidth control device uses the management registration table (see FIG. 4).
103 and FIG. 5) and a congestion detection circuit (102 in FIG. 4), and a traffic control circuit in the traffic control circuit (104 in FIG. 4) according to claim 1. (B in FIG. 4).

The packet frame format of the packet signal is shown in FIG. In the communication terminal packet frame format, in addition to the data 203, a destination terminal identifier for identifying a destination communication terminal and a source terminal identifier for identifying a source communication terminal (in this embodiment, the destination MAC address 201 and the source MAC address 202) is included.

The management registration table (103 and FIG. 5 in FIG. 4) of the congestion detecting means manages the belonging LAN name to which each wireless LAN terminal belongs, the wireless LAN terminal name and the wireless LAN terminal. A terminal identifier for identifying a terminal (in this embodiment, a MAC address of a wireless LAN terminal) and a wireless L
Information of a LAN identifier indicating which LAN the AN terminal belongs to is input and held as a database.

When the packet signal of FIG. 5 is input (101) to the congestion detection circuit, a unique terminal identifier (for example, MAC address) is determined from the destination terminal identifier of the communication terminal and the source terminal identifier included in the packet signal. To extract.

The terminal identifier extracted by the congestion detection circuit is
Since it is registered in the management registration table 103, it is collated with the management registration table to identify the LAN name to which the wireless LAN terminal communicating with the packet signal belongs.

For example, a wireless LA input to the band control device
The destination MAC address in the packet signal addressed to the N terminal (see FIG.
() Includes the MAC address a of the wireless LAN terminal. By comparing the MAC address a of the wireless LAN terminal with the management registration table, the terminal name is A-1 from the communication terminal name in FIG. 5 and the wireless LAN belonging to LAN-A from the belonging LAN name in FIG. It turns out to be a LAN terminal.

Since the LAN name to which the wireless LAN terminal belongs can be specified in the above step, the congestion detection circuit causes the packet signal of the wireless LAN terminal for each LAN, in other words, the wireless L.
The traffic of the AN terminal is classified and the sum of the traffic per unit time is calculated.

Next, the congestion detection circuit uses the congestion detection threshold preset for each LAN and the L calculated in the above step.
The traffic sum per unit time for each AN is compared, and LA is compared.
When N is congested, the congested LAN identifier is output to the traffic control circuit as it is, if not congested, the packet signal is output as it is.

The traffic control circuit (104) collates the in-congestion LAN identifier output from the congestion detection circuit with the LAN identifier in the management registration table (103), and determines the matching traffic of the wireless LAN terminal to be equal to or less than the congestion detection threshold. Traffic control is performed to output from the band control device.

The structure of the present invention according to claim 3 is the same as that of FIG. FIG. 7 shows an operation flow of the band control method.

A packet signal is input to the band control device (301).

A value for identifying the wireless LAN terminal is extracted from the packet signal input to the band control device. For example, the MAC address is extracted from the source terminal identifier and the destination terminal identifier (302).

Next, the terminal management registration table is inquired (303).

As a result, the LAN name connected to the wireless LAN terminal communicating using this packet signal is specified, and L
The traffic of the wireless LAN terminal is classified for each AN (30
4).

Next, the traffic of the wireless LAN terminals classified for each LAN is totaled for each unit time for each LAN (30
5).

Next, it is judged whether or not each LAN is congested (306).

If the totaled value exceeds the set LAN congestion threshold, traffic control is performed so that the congestion threshold is satisfied for each LAN (308). If the line congestion threshold is not exceeded, traffic control is performed. Do not do (30
7).

[0032]

As described above, according to the present invention, a plurality of L
By solving the problem that the communication control of the AN line is individually calculated for each LAN and the congestion is detected, the traffic control is activated and the communication speed is reduced even though the wireless LAN line is not congested. This makes it possible to effectively utilize the line. In addition, since there is no need to add a band control device, there is an effect of suppressing an increase in cost.

[Brief description of drawings]

FIG. 1 shows an example of a usage configuration of a band control device.

FIG. 2 shows another usage configuration example of the band control device.

FIG. 3 shows still another example of the configuration of use of the band control device.

FIG. 4 is a block diagram showing a configuration of the present invention.

FIG. 5 is a frame format of a packet.

FIG. 6 is a management registration table of the present invention.

FIG. 7 is an operation flow of the bandwidth control method of the present invention.

[Explanation of symbols]

101 Packet signal input 102 Congestion detection circuit 103 management registration table 104 Traffic control circuit 109 packet signal output

─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masahiro Morikura 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nihon Telegraph and Telephone Corporation (56) References JP 2000-106569 (JP, A) ( 58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 12/46

Claims (2)

(57) [Claims] 1. A bandwidth control device, which is provided between a backbone network and a plurality of local area networks (LANs), and comprises a traffic control means for packet communication performed by a plurality of communication terminals connected to the LAN via the backbone network. When a packet signal is input to the device, the destination terminal of the packet signal
The destination terminal identifier that identifies the
Extracting the terminal identifier of the communication terminal from the sender terminal identifier,
The extracted terminal identifier and the LA to which the communication terminal belongs
It can be checked against a database consisting of N LAN identifiers.
Identifies the LAN to which the communication terminal belongs by
And calculate the traffic volume per unit time for each LAN
However, if the traffic volume is
If it is larger than the threshold to be output, it is determined that
Congestion detecting means for outputting a LAN identifier, LAN identifier and the packet signal to which the congestion detecting circuit outputs
Is entered and belongs to the LAN indicated by the LAN identifier.
Communication terminals are connected via the backbone network.
Band control device, characterized in that it comprises a traffic control means for controlling the amount of traffic Urn packet communication. 2. An amount of traffic of packet communication performed by a plurality of communication terminals connected to the LAN by installing a band control device between the backbone network and a plurality of local area networks (LAN). In the traffic control method for controlling the above, the bandwidth control device registers the communication terminal communicating under the LAN in a table with the terminal identifier of the communication terminal and the LAN identifier of the LAN to which the communication terminal belongs. A communication terminal that uses a packet signal from a destination address and a source address of a packet signal to be transferred between the backbone network and the LAN, in which a threshold value for detecting congestion of the LAN is registered. And the terminal identifier of the communication terminal held by the table L of the LAN to which the communication terminal belongs
The LAN to which the communication terminal is connected is specified from the AN identifier, and the traffic per unit time is aggregated for each LAN,
When the communication traffic of a certain LAN exceeds the threshold, it is determined that the LAN is congested, and the traffic control is performed on the communication terminal connected to the LAN, and when it is less than the threshold, the traffic control is not performed. Traffic control method characterized by: