JPH09275403A - Traffic control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of conducting proper traffic control on an internet built up on a non-multiple address wide area network. SOLUTION: An address solution server collects periodically information of a traffic flow in a network, and when an address solution request to solve a physical address used in the network from a destination internet address is received from a transmission terminal equipment, the reply is made or not in a different physical address depending on the traffic flow in the network. When the network is idle, the destination internet address is solved and replied and in the case of a congested network, whether or not a reply is made to an address solution request through registration in advance and in the case of making a reply, the address of a router on a communication path with a smaller load on plural communication paths is solved to make the reply and when load of all the communication paths reaching a destination terminal equipment is high, no reply is made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic control method suitable for use in the internet constructed on a non-broadcast type wide area network.

Conventional traffic control is performed by exchanging traffic information between a packet switching node and a terminal and voluntarily controlling transmission control of each packet switching node. For example, when a particular packet switching node is congested, in order to reduce the traffic flowing into the congestion packet switching node, the congestion packet switching node notifies the surrounding packet switching nodes of the congestion information, and the packet switching notified of the congestion information. A node voluntarily restricted packet transmission to a congestion packet switching node.

[0003]

The conventional traffic control method depends on the voluntary regulation control of the packet switching node, and is suitable when there is a packet switching node that does not perform the voluntary regulation control. Could not control.

Further, in such a conventional traffic control method, it is difficult to bypass the congestion point on the optimum route of the user packet based on the address information of the transmitting / receiving terminal, and it is possible to evenly distribute the traffic in the network. There are problems that it is difficult, it is difficult to prevent only new traffic from flowing into the network, and it is difficult to restrict only intra-group communication or inter-group communication. These problems have arisen from trying to perform traffic control using only the packet switching node for relay.

Therefore, it is an object of the present invention to provide a method capable of performing appropriate traffic control, particularly for traffic control on the Internet constructed on a non-broadcast type wide area network.

[0006]

In order to achieve the above object, the present invention provides an address resolution server on a non-broadcast type wide area network with information of the traffic flow rate in the network managed by itself at a specific frequency. When an address resolution request that collects and resolves the physical address used in the non-broadcast wide area network from the destination terminal or the internet address of the relay router is received from the transmitting terminal, the physical address differs depending on the traffic flow in the network. It is a method of responding or not responding.

According to the present invention, when an address resolution request for resolving a physical address used in a non-broadcast wide area network from an internet address of a destination terminal or a relay router is received from a transmitting terminal, the network becomes idle. If it is, the destination Internet address in the address resolution request is resolved and an address resolution response is sent, and if the network is busy, the address resolution request from the registered (or not registered) sending terminal is sent. On the communication path that does not send the address resolution response to the destination terminal and receives the address resolution request from the sending terminal that is not registered (or registered) in advance, the load of the communication paths that reach the destination terminal is light Resolves the address of the relay router and sends an address resolution response,
When the load on the relay routers or exchanges on all the communication paths to the destination terminal is heavy, the address resolution response may not be transmitted.

The present invention is a method for controlling traffic in a network in which the Internet is constructed on a non-broadcast wide area network by using an address resolution server in addition to a relay packet switching node. It operates as follows depending on the flow rate of the flowing traffic and the dispersion state.

Normally, the address resolution server resolves the physical address of the destination terminal so that a direct connection can be set between the transmitting and receiving terminals and high-performance communication can be performed. -When the traffic load on the network is heavy, the address resolution server uses the address information of the sending and receiving terminals to resolve the optimal physical address of the relay router or packet switch for the detour so that the user packet can be used for the detour. The data can be transferred to the receiving terminal via the relay router or the packet switch to optimally bypass the congestion point.

When there are variations in the load on the plurality of relay routers or packet switches, the address resolution server selects the physical address of the relay router or packet switch having the smallest traffic load from the plurality of relay routers or packet switches. By solving the above problem, it is possible to disperse the traffic in the network and suppress the performance deterioration of the entire network due to the local increase of the network load. When the traffic load on the network is heavy, the address resolution server does not respond, so that the inflow of new traffic into the network can be blocked, and congestion can be prevented.

When the traffic load on the network is heavy, the address resolution server further selects whether to perform address resolution or not based on the address information of the transmitting / receiving terminal, thereby performing communication within the same group. It is possible to regulate only one or only intergroup communication.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a network model for implementing the present invention, and FIG. 2 is a flow chart showing the operation of an address resolution server when implementing the traffic control method according to the present invention.

In the network model of FIG. 1, a wide area AT
Logical IP subnets 2, 3 and 4 are configured on the M network 1. The logical IP subnet 2 includes the terminal 5. The logical IP subnet 3 includes a terminal 6, routers 7 and 8, ATM exchanges 9, 10, 11 and 12, and an address resolution server 13. The logical IP subnet 4 includes the terminal 14.

Here, the routers 7 and 8 perform an IP packet exchange process. Also, ATM switches 9, 10, 11 and
12 performs an ATM cell exchange process. Further, the address resolution server 13 performs address resolution processing for resolving the ATM address from the internet address of the destination terminal based on the requests from the terminals inside and outside the subnet 3, and at that time, the terminal (terminal 6) within the subnet 3 Or a router (router 7,
8) Only address resolution is performed.

In such a network model,
When the terminal 5 or 14 attempts to establish a direct ATM connection between the terminals 5 and 14 in order to perform high-quality communication with the terminal 6, an optimal route should be considered in consideration of the load on each node in the network. Consider a traffic control method that can be used for communication. In this embodiment, the traffic is controlled by operating the address resolution server 13 as shown in the flowchart of FIG. 2 for the network model of FIG.

That is, the address resolution server 13 transits to the network load observation state 21 for observing the traffic processing load states of the ATM switches 9, 10, 11 and 12 and the routers 7 and 8 at a specific frequency prior to the address resolution processing. To do. After this, terminal 5
Or transition to address resolution request packet reception state 22 to receive the address resolution request packet transferred from 14, and when the address resolution request packet is received, is the network available based on the network load observation information previously observed? The state transits to the network load determination state 23 for determining whether or not. Here, if the network is idle, the terminal 6 transits to the ATM address resolution state 24, and then returns the generated address resolution response packet to the sending side terminal (terminal 5 or 14). Transition to.

If the network is busy in the network load determination state 23, the state transits to the state 25 of checking the source address and the destination address. Here, when the transmission restriction is applied to the transmitting terminal, the state transitions to the state 26 where address resolution is not performed. For example, in the case where the registered transmitting terminal is restricted, if the transmitting terminal 14 is registered, for example, the destination terminal 6
To the address resolution request from the sending terminal 14 for. Thereby, the communication between the terminal 14 and the terminal 6 can be restricted.

On the other hand, in the matching state 25 of the source address and the destination address, when the transmission restriction is not applied to the transmission terminal, for example, when the address resolution request from the transmission terminal 5 to the destination terminal 6 is accepted, the router 7 And router 8
Transition to load comparison state 27 with. Here, for example, the load of the router 7, the ATM switch 10, etc. is the router 8, the ATM switch.
When the load is smaller than 11 or the like, the router 7 transits to the ATM address resolution state 28 of the router 7. After that, the state transitions to the address resolution response packet transmission state 31 in which the generated address resolution response packet is sent back to the transmission side terminal (terminal 5).

In the load comparison state 27 between the router 7 and the router 8, if the load of the router 8, the ATM switch 11 or the like is smaller than the load of the router 7, the ATM switch 10 or the like, the ATM address resolution state of the router 8 is obtained. Transition to 29.
After that, the state transitions to the address resolution response packet transmission state 31 in which the generated address resolution response packet is sent back to the transmission side terminal (terminal 5). In the load comparison state 27 between the router 7 and the router 8, if the load of the router 8, the ATM switch 11 and the like and the load of the router 7, the ATM switch 10 and the like are both heavy, the state transitions to the state 30 in which address resolution is not performed. .

By these controls by the address resolution server 13, for example, when the address resolution server 13 resolves the ATM address of the reception terminal 6 in response to the address resolution request from the transmission terminal 5, the transmission terminal 5 and the reception terminal 6 Direct communication using the communication path 15 is realized in the meantime. Further, when the address resolution server 13 resolves the ATM address of the router 7 in response to the address resolution request from the sending terminal 5, the communication path 16 via the router 7 is used between the sending terminal 5 and the receiving terminal 6. Communication is realized. By this, for example, A
When the ATM switch 9 and the ATM switch 11 are congested, they can be bypassed.

Further, the address resolution server 13 causes the sending terminal 5 to
When the ATM address of the router 8 is resolved in response to the address resolution request from, the communication using the communication path 17 between the transmitting terminal 5 and the receiving terminal 6 via the router 8 is realized.
This allows, for example, ATM switch 9 and ATM switch.
This can be bypassed if 10 is congested. If the address resolution server 13 does not perform address resolution in response to the address resolution request from the transmission terminal 5, the transmission terminal cannot perform packet transmission, and as a result, packet transmission is restricted.

As described above, according to the present invention, even in the communication between the same transmitting / receiving terminals, the route is changed according to the load distribution situation of each node in the network, and the traffic is controlled so that the communication can always be performed in the optimum route. To be done.

[0023]

As described above, according to the present invention, the following effects can be obtained according to the amount of traffic flowing in the network. -The user packet bypasses the congestion point and is transferred to the receiving terminal. -Distribution of traffic within the network can be achieved, and performance degradation of the entire network due to local increase in network load can be suppressed. -It is possible to prevent new traffic from flowing into the network and prevent congestion. -It is possible to restrict only intra-group communication or only inter-group communication.

[Brief description of drawings]

FIG. 1 is a diagram showing a network model for implementing the present invention.

FIG. 2 is a flowchart showing an operation of an address resolution server when implementing a traffic control method according to the present invention.

[Explanation of symbols]

 1 Wide Area ATM Network 2, 3, 4 Logical IP Subnets 5, 6, 14 Terminals 7, 8 Routers 9, 10, 11, 12 ATM Switch 13 Address Resolution Servers 15, 16, 17 Communication Paths 21-31 Each Step of Flowchart

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Ozawa 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. A traffic control method in a network in which an internet having an address resolution server is constructed on a non-broadcast type wide area network, wherein the address resolution server manages information on the traffic flow volume in the network managed by itself at a specific frequency. , And when an address resolution request for resolving the physical address used in the non-broadcast wide area network from the destination terminal or the internet address of the relay router is received from the transmitting terminal, a different physical address depending on the traffic flow in the network. A traffic control method characterized by responding or not responding with. 2. When an address resolution request for resolving a physical address used in a non-broadcast wide area network is received from a sending terminal from an internet address of a destination terminal or a relay router, if the network is idle, address resolution is performed. If the destination Internet address in the request is resolved and an address resolution response is sent, and if the network is busy, an address resolution response will be sent to the address resolution request from a transmission terminal that has been registered (or not registered) in advance. In response to an address resolution request from a sending terminal that has not registered (or has registered) in advance, resolves the address of the relay router on the communication path with the smallest load among the multiple communication paths to the destination terminal. And send the address resolution response, and if the load on the relay router or switch on all communication paths to the destination terminal is heavy, send the address resolution response The traffic control method according to claim 1, wherein the traffic control method is not performed.