JP2842287B2 - Communication method between ATM switch and network management system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method between an ATM switch and a network management system, and more particularly to a method having a plurality of Internet addresses so as to have a plurality of sub-networks in the ATM switch, a virtual router function and a dynamic router. The present invention relates to a multilink communication method between an ATM switch having a function of rewriting route information and a network management system.

[0002]

2. Description of the Related Art Conventionally, as a multi-link communication system between an ATM switch and a network management system of this kind, it is intended to change the route when a route failure occurs between a network management device and a packet switch in a packet switching network. There is a method.

As a method for performing the above-mentioned route change, for example, as disclosed in Japanese Patent Application Laid-Open No. 4-46436, a special number previously assigned to a packet switch from a network management device side in the event of a line failure is dialed. There is a method of controlling from a network management device via a public network without using the own network.

In order to change the route when a route failure occurs between a multi-layered exchange and a network management device, as disclosed in Japanese Patent Application Laid-Open No. 4-266248, an abnormality or failure has occurred in the main route. In the case, the exchange side determines an alternative route for detour provided in advance, transmits a command of a detour instruction from the determined alternative route to the network management device,
There is a method in which the network management device sets a logical path as an alternative route upon receiving the detour instruction command and controls the exchange.

[0005]

Among the route change methods at the time of a route failure performed between a network management device and a packet switch in the above-described conventional packet switch network,
In the method of controlling from a network management device via a public network, when the network management device tries to control a packet switch and finds a failure in a route, the network management device sets a detour route via the public network. Because of this configuration, there is a problem that a detour route is not set unless the network management device controls the packet switch, and the network management device cannot receive information autonomously output by the packet switch.
Further, it is necessary to connect a public network to each packet switch. It is necessary to prepare control procedures for both the 25 interface control and the non-procedural interface control, and there is a problem that the configuration becomes complicated.

Further, in the route change method at the time of a route failure performed between a multi-layer switch and a network management device, it is impossible to set a logical path to a detour route when there is no free logical path for an alternative route. There is a problem. Further, when the fault is recovered, there is a problem that the line is not switched back to the main route unless a line test is performed from the terminal of the network management device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is intended that a detour path can be made without rerouting via a public network when a route failure occurs. It is an object of the present invention to realize a communication method between an ATM switch and a network management system which can establish a link between the network management system and the ATM switch and perform communication.

[0008]

SUMMARY OF THE INVENTION A multilink communication method between an ATM switch and a network management system according to the present invention has a plurality of Internet addresses, a plurality of system routers, and a plurality of ATM transmission lines so as to have a plurality of sub-networks. A multi-link communication method is performed between an ATM switch having a virtual router function and a function of rewriting route information and a network management system, wherein the multi-link communication with the network management system is performed in the ATM switch. The network management system, routers, virtual routers in the ATM switch, the Internet addresses and host names of the ATM switch itself, and the current status of network information such as route information required for communication with the network management system. The first key to keep updatable A second step of periodically receiving information from a router connected to the sub-network and rewriting route information in the first step in accordance with the received contents; and a sub-network in the ATM switch. A third step of rewriting the route information to a type that does not use the failed ATM transmission line when a failure occurs in the constituent ATM transmission line; and when communicating with a network management system in the ATM exchange, And a fourth step of transmitting / receiving data to be transmitted / received along the route information.

In this case, when a plurality of pieces of route information are held in the first step and new route information is held, the route information that has not been updated for a certain period of time is deleted and new route information is deleted. It may be held.

[0010]

In the multilink communication method between the ATM switch and the network management system according to the present invention configured as described above, the ATM switch has a plurality of sub-networks.
Route information when communicating with the network management system by the sub-network is periodically updated by information from a router, and when a failure occurs in a line, the route information is rewritten to information not using the line. Transmission and reception along the route information can always be performed without any problem.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an embodiment according to the present invention, and is a block diagram showing a connection state between an ATM switch and a network management system. FIG. 2 is a diagram showing a setting state of an Internet address and a host name for each device in the embodiment shown in FIG. 1, and FIGS. 3 and 4 show network information in an ATM exchange to which the communication method of this embodiment is applied. FIG. 5 is a flowchart showing a processing operation at the time of data transmission / reception in communication with the network management system in the ATM exchange according to the present embodiment.

The apparatus relating to the communication method between the ATM exchange and the network management system according to the present embodiment is an ATM exchange controller 1
00 and an ATM switching device (hereinafter referred to as an ATM SW).
5), ATM SW control device 4, and ATM
Concentrator-A (6), ATM concentrator-B (8), A
ATM controller A (7), ATM controller B (9), A
TM line terminator A (11), ATM line terminator B
(12) An ATM line terminating device C (13) and a gateway pad (hereinafter, referred to as a "gateway pad") which collects cells based on the contents written in the header of the transmitted cells and forms a frame.
ATM switch 2 comprising a device 10 (referred to as GWPAD)
00, a network management system router A (14), a network management system router B (15), and a network management system A (1
6), and a network management system B (17).

The ATM switch control device 100 controls the entire operation of the ATM switch 100, and controls the ATM switch control device 4 and the ATM control device A via the input / output interface 3.
(8), B (6) and a memory which is connected to the control terminal 18 for registering and displaying initial data and the like in the ATM switch 200, performs input / output data processing, and stores various data such as programs of the CPU 2 and path data. One.

Next, an operation related to communication with the network management system of this embodiment will be described with reference to FIG. 2 and FIGS. 3 to 5 showing a control operation of the CPU 2.

In the ATM exchange of this embodiment, when the operation is started, it is determined whether or not the start is to be resumed. When the restart occurs (step S40), after waiting for a predetermined time (step S41), the path setting process in the ATM switch (step S42) is performed based on the path information in the ATM switch stored in the memory 1.

The path established at this time is from the ATM switch control device 100 to the ATM control device A (7), the GWPAD device 10, the ATM line concentrator-A (6), and the ATM SW.
Device (5), ATM line concentrator-A (6), ATM line concentrator-B (8), ATM line terminator-A (1
1) A path that goes to the ATM transmission line 22 through the ATM line termination device-B (12) and the ATM line termination device-C (13). If the path setting within the ATM exchange is OK (step S43), the fact that the path has been established is stored in the memory 1 (step S44), and a message indicating that the path has been set is displayed on the control terminal 18 (step S45). Regardless of the result of step S43, it is determined whether paths have been set for all paths in the ATM switch 200 stored in the memory 1 (step S46). If there is unset path information, step S41 is performed.
When all the path settings are completed, the processing is terminated.

If the start in step S40 is not resumed, it is determined whether the request is a registration request for network information from the control terminal 18 (step S47). If the request is a registration request, it is compared with information already registered in the memory 1. hand,
It is determined whether the information can be registered (step S48),
If the information can be registered, it is registered in the memory 1 (step S
49), and displays registration OK on the control terminal 18 (step S).
50) End the process. If it is determined in step S48 that the information is not correct, registration NG is displayed on the control terminal 18 (step S51), and the process ends.

The information to be registered here is, as a network address, a network management system A (1).
6), network management system B (17), exchange-side subnetwork A (23) of network management system router A (14)
RTA1 (31) network management system router B on the side
RTB1 (32) on the exchange side subnetwork B (24) side of (15), and ATMA3 on the network management system A (14) side of the virtual router function 37 in the ATM exchange.
3. ATMB 34, which is the network management system B (15) side of the virtual router function 37 in the ATM switch, and the virtual communication link (hereinafter, VC) of the ATM switch itself.
SWA 35 on the A (27) side and SWB 36 on the VCLB (28) side of the ATM switch itself.

The communication links include a VCLA 27 that associates the SWA 35 with the ATMA 33 or ATMB 34, and a VCLB 28 that associates the SWB 36 with the ATMB 34 or ATMA 33, all of which are virtual in the exchange 200.

As the actual communication link, N is used to associate the ATMA 33 with the RTA (31) on the ATM exchange side of the network management system router A (14).
CLA 25, ATMB 34 and network management system router B
The NCLB 26 associates the RTB (32), which is the ATM exchange side of (15) .

The initial route information to the network management system includes the network management system A16 or the network management system B17, the network management system router A14, and the network management system router B15 in order to associate the router with the network management system.
RTA1 (31) or RTB1 (32) on the TM exchange side
Network management system sub-network 21 and network management system router B1 to associate each system router with network management system sub-network 21.
5. Associating RTB0 (30) and RTA0 (29), which are the ATM exchange side of the network management system router A14, and the normal mode for exchanging the registered route information with the adjacent router. The mode in which the route information is rewritten by transmission / reception), the reception only (mode in which the route information is rewritten based on the route information received without transmission), and the rewrite stop (the route information is not transmitted / received and the currently registered route information is Operation mode).

If it is determined in step S47 that the request is not a registration request, it is determined whether the request is a path setting request in the ATM exchange from the control terminal 18 (step S52). If the request is a path setting request, the path designated in the ATM exchange is determined. It is set (step S53), it is determined whether the path setting in the ATM exchange is OK (step S54). If it is OK, the path information is stored in the memory 1 (step S55), and the path setting OK is displayed on the control terminal 18. (Step S56), and ends. If it is determined in step S54 that the path cannot be set, a path setting NG is displayed on the control terminal 18 (step S57), and the process ends.

If it is determined in step S52 that the request is not a path setting request, it is determined whether the network management system router is started periodically by supplying route information (step S58). It is determined whether the mode of handling the stored route information is other than stop (step S59). If the mode is not stop, the route information in the memory 1 that has not been updated for a certain period of time is deleted and the network management system router is deleted. Is stored in the memory 1 (step S60), and it is determined whether the handling mode of the route information stored in the memory 1 is normal (step S61). A14, to send the current route information stored in the memory 1 to the network management system router B15 Out request was carried out (step S62),
The process ends. When the handling mode of the route information stored in the memory 1 is the stop mode in step S59, and when the handling mode of the route information stored in the memory 1 is not the normal mode in step S61, the process ends.

By deleting the route information that has not been updated for a certain period of time and storing the route information supplied from the network management system router as in step S60, the plurality of route information stored in the memory 1 is updated. And can be the shortest path.

If it is not a periodic activation request in step S58, it is determined whether or not route information is received from a router adjacent to the ATM exchange (step S63).
If the route information is received, it is determined whether the handling mode of the route information stored in the memory 1 is other than stop and is the first reception in a cycle to be received (step S64). If received, the current route information stored in the memory 1 is updated and stored in the memory 1 (step S65). The method of updating the current route information at this time is such that the route between the ATM switch application software 38 and the network management system A16 is
7, when the connection is established through the NCLA 25 and the network management system router A14, if the route information is received first from the network management system router B15, the current route information is transmitted to the ATM switch application software 38, V
CLA 27, NCLB 26, network management system router B1
5. The route information is rewritten as the route information of the network management system A16.

Subsequently, it is determined whether there is newly added route information (step S66). If there is newly added route information, it is determined whether data for the route is queued in the waiting queue (step S66). S67) If queued, data for the route is taken out of the waiting queue, and a transmission request is made to send the data to the route (step S68). This process is repeated until there is no more data for the route in the queue.
When the mode is stopped in step S64 or the second or subsequent route information is received in the cycle, when there is no newly added route in step S66, and when there is no data for the route in the waiting queue in step S67, the process is performed. To end.

If it is determined in step S63 that route information has not been received, it is determined whether a line fault notification has been received (step S6).
9) If the line failure notification is received, it is determined whether or not the line has a path set in the ATM exchange for communication with the network management system (step SS70).
If the line has a path set in the M exchange,
From the current route information stored in the memory 1, the route information using the line that has issued the failure notification is changed to the route information using another line, and the route information is stored in the memory 1 (step S71), and the process ends. . If it is determined in step S69 that a line failure notification has not been received, and if it is determined in step S70 that the failed line is not a line for which a path has been set, the process ends.

When transmitting / receiving information to / from the network management system, the ATM exchange judges whether the request is a transmission request to the network management system (step S72). It is determined whether the information is included in the current route information in the memory 1 (step S73). If the route information to the destination network management system is included in the current route information in the memory 1, the information is transmitted to the route. The information is sent out (step S74), and the process ends. If it is determined in step S73 that there is no route information, the transmission request information is queued in the waiting queue (step S75), and the process ends.

If it is determined in step S72 that the received information is not a transmission request to the network management system but received information from the network management system, it is determined whether the received information is route information (step S76). For example, control is passed to the process of maintaining and updating the current state of the network information shown in FIGS. 3 and 4 (step S77), and the process is ended.

If it is determined in step S76 that the received route information has not been received, the received information is transferred to the ATM switch application software 38.
Then, the VCLA 35 or VCLB 36 in the ATM exchange to be delivered is selected from the current route information, and the received information is sent to the ATM exchange network address (step S78), and the process is terminated.

[0032]

Since the present invention is configured as described above, it has the following effects.

In the method according to the first aspect, the ATM
A network address of an ATM exchange, a virtual router, a network management system router, a network management system, etc.
A plurality of route information and the like between the TM exchange and the network management system are constantly stored in an updatable manner so as to be constantly updated. When sending and receiving data, a destination is automatically determined based on current route information and data is sent and received. Therefore, when a route failure occurs, the detour can be performed without rerouting the detour path via the public network, and there is an effect that the link between the network management system and the ATM exchange is always established and communication is possible.

In the method according to the second aspect, since the route information is always kept up to date, there is an effect that the information can be transmitted through the shortest route.

[Brief description of the drawings]

FIG. 1 is a connection diagram between an ATM switch and a network management system according to an embodiment of a communication method between the ATM switch and the network management system of the present invention.

FIG. 2 is a setting diagram of an Internet address, a host name, and the like to each device constituting a network in one embodiment of a communication method between an ATM exchange and a network management system according to the present invention.

FIG. 3 is a flowchart of updating and maintaining the current status of network information in an ATM exchange to which the communication method of the present invention is applied.

FIG. 4 is a flowchart of maintaining and updating the current state of network information in the ATM exchange to which the communication method of the present invention is applied.

FIG. 5 is a flowchart of a process at the time of data transmission / reception in communication with a network management system in an ATM exchange according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 memory 2 CPU 3 input / output interface 4 ATM SW controller 5 ATM SW device 6 ATM concentrator A 7 ATM controller A 8 ATM concentrator B 9 ATM controller B 10 GWPAD device 11 ATM line termination device A 12 ATM line termination Device B 13 ATM line termination device C 14 Network management system router A 15 Network management system router B 16 Network management system A 17 Network management system B 18 Control terminal 21 Network management system subnetwork 22 ATM transmission line 23 Subnetwork A 24 Subnetwork B25 NCLA 26 NCLB 27 VCLA 28 VCLB 29 RTAA 30 RTB 31 RTA 32 RTB 33 ATMA 34 ATMB 35 SWA 36 SWB 37 Virtual router function 38 ATM exchange Exchange application software

Claims (2)

(57) [Claims] 1. A plurality of internet addresses and a plurality of system routers having a plurality of sub-networks.
And having a plurality of communication links as ATM transmission line, a multi-link communication method performed between the ATM switch and the network management system having a function of rewriting the virtual router function and route information, the network management ATM exchange Network management systems, routers,
A first step of maintaining the current state of network information such as a virtual router in the ATM switch and each Internet address and host name of the ATM switch itself and route information when communicating with the network management system in an updatable manner; A second step of periodically receiving information from a router connected to a network, and rewriting route information in the first step in accordance with the received content; and an AT configuring a sub-network in the ATM exchange.
A third step of rewriting the route information to one not using the failed ATM transmission line when a failure occurs in the M transmission line; and transmitting and receiving the route information when communicating with the network management system in the ATM switch. 4th data transmission / reception along route information
And a multi-link communication method between the ATM switch and the network management system. 2. A multilink communication method between an ATM exchange and a network management system according to claim 1, wherein a plurality of pieces of route information are held in the first step, and a new route information is held. A multi-link communication method between an ATM exchange and a network management system, wherein route information that has not been updated for a predetermined time is deleted and new route information is retained.