JPH04207335A - Fault countermeasure system for network system - Google Patents

Abstract

PURPOSE:To attain restart of communication between a deputy host device and a faulty network by connecting a bypass from an operationable TDM (multiplexer) of the faulty network to a deputy TDM of the deputy operation host device HOST (host computer) via an ISDN with a command from a network management equipment of the faulty network on the occurrence of a fault. CONSTITUTION:When a fault takes place in a TDM 101 connecting to a HOST 108, fault information is sent to the TDM 103 opposite to the faulty TDM 101. The TDM 103 dials a telephone number of the faulty TDM 101 with a command from a network management equipment 110 to make a link connection request to the faulty TDM 101 via an ISDN line and when a channel is set, the communication between the HOST 118 and a terminal equipment 119 is restarted. Moreover, when the channel is not established, a telephone number of the deputy TDM 111 connecting to the deputy operation HOST 118 is dialed and a link connection request is made to the deputy TDM 111 via the ISDN line to establish the channel. Thus, the communication between the HOST 118 and the terminal equipment 119 is restarted and the network with high reliability is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a host combi coater (hereinafter referred to as H○ST).
The present invention relates to a fault countermeasure method for a network system that enables line core service to be resumed when using an ISDNM line in the event of a Ho5T and TDM (multiplexing device) failure in a network system that accommodates the following.

[Conventional technology]

The conventional +((msT) network has a configuration as shown in Figure 7. In Figure 7, 7014
．． 1H1'iST, 702-705Lt TDM, 7
06 high i end, 707 high if% speed relay line, 708 network management device, 709 public network (7 relay line, 710 user line, 711) communication path between IQST one terminal, 7
12 is a communication path between H(msT and one terminal) via the public network.

Here, the TDM of Ren, Q, in the network, e.g. TD
If a failure occurs in I'13 and it stops functioning, the network management device will notify you that a failure has occurred (1, and the route passing through TD A3
Route 1 via public network, a detour for 1.711
By setting 2, communication between the terminal 10ST and the terminal was restarted.

However, if a failure occurs in ) 10ST 7 or TDM 706, HQS 770
There was a problem that communication between terminals remained cut off.

Therefore, as a means to solve this problem, conventional technology -c-
C. As shown in FIG. 8, HilNST 8.05. ! =
TDM 814 is installed, and when a 110STI failure occurs, H○5T81.5 takes over, and TDl'l
When 806 failure occurs, TDM802 to TDM81
)1 by detouring through a high-speed relay line between
0ST~Continue communication between terminals (X.

An example of a related system of this type is JP-A-2-4.3844.

[Problem to be solved by the invention]

This type of network configuration as described in Section 2 had the problem that the cost was considerably high due to the addition of 'T'@[iST equipment, TDM expansion, and accompanying high-speed trunk line equipment.

The present invention aims to solve the above problems,
If a failure occurs in the HO3T or TDM and communication between one terminal of the I]○ST is interrupted, the network management device will instruct the network to act as a substitute for the failed network in a network that is completely independent of the failed network. TDM connected to H○ST with
= A detour route is established between the TDM and the capable TDM via the 15DN network, and communication between the failed network H(mST is performed by proxy operation 1-103T of another network, and the proxy) IQST and the terminal are The network can be restarted immediately, and costs can be reduced by using other networks instead of installing a standby H○ST, and by detouring through the 15DN network instead of using a high-speed relay line. The objective is to provide a low cost network system configuration method.

[Means to solve the problem]

In order to achieve the above purpose, this network configuration method establishes two or more completely independent networks consisting of HcrsT and terminals, and each Hcisr has communication means and proxy operation functions for terminals of other networks. , Furthermore, apart from the normal operation TDM, HO of other networks
A spare T with exactly the same configuration as the TDM connected to the 3T
A DM (hereinafter referred to as a proxy TDM) is connected, and when a failure occurs, an operational TDM of the failed network performs proxy operation HO3T via the I5IIN network based on instructions from the network management device of the failed network. T.D.
By connecting a detour to M, communication between the proxy HQST and the terminals of the failed network can be restarted.

[Effect]

In any network of this configuration, HO3T or)
When a failure occurs in a TDM connected to an IQST, failure information is sent to the TDM opposite the failed TDM.

Based on instructions from the network management device, the TD opposite the faulty TDM
M first calls the telephone number of the faulty TDM and calls l5IIN.
If a link connection request is made to the faulty TDM via the network line and a communication path is established, communication between the HO3T and the terminal can be resumed, but if the communication path cannot be established, alternate operation I]
○By calling the telephone number of the proxy TDM connected to the ST, making a link connection request to the proxy TDM via the 15DN line, and establishing a communication path, the proxy operation HO3T
~ Communication between terminals can be resumed. In addition, the proxy TDM accessed at that time is recognized exactly the same as the faulty TDM from the terminal side TDM, and IIQs
Since T also has a proxy operation function, it is possible to restart exactly the same communication as before the failure occurred, making it possible to realize an extremely reliable network.

〔Example〕

Hereinafter, the present invention will be explained using figures.

FIG. 1 is a network configuration diagram of an embodiment of the present invention.

NET], TDMIOI to 1.03 are connected via a high-speed relay line, and the NCU 11.0, which is a network management device connected to the TDM 102, monitors and manages the NETI network. Also, HO3T 108 is connected to TDMI, 01, and TDMI 02 and TD
Terminals are connected to M103, and during normal operation, H*ST 108 to terminal-to-terminal communication A5 is performed via a high-speed relay line.

NET 2 and ite as well 4. ．． 1,, TDMII
N-113 is connected from a high-speed relay perspective, and TDM1
NET by the network management device 1NCU20 connected to 12
2 network monitoring and network management. Also, TDM121
IQST 118 is connected to TDMI]2 and TD
A terminal is connected to M, 113, and during normal operation, communication between the terminals from I(O 371, 18) is performed via a high-speed relay line.

Normally, NET 1 and NET 2 are operated independently of each other, but as a countermeasure in the event of a failure, NET 1's)iosT 108 is set to NET2's T
N
ET2's HO3T 1],,8 is NET]'s TDM
A TDM 114 having exactly the same configuration as the IOI is connected in advance. Also, )IO8T108 is, for example)I(:
) I40ST the data stored in ST1.08
HO3T 11.8 is also stored in HO3T 118, and the data is normally retrieved from HQST 108 for operation, but if a failure occurs in HQST 108, the same data is retrieved from HO3T 11.8 and operated.
8, and vice versa.

Next, the operation of the network system configuration method using the 15DN line when a failure occurs in the network system configuration shown in FIG. 1 will be described. FIG. 2 is a flowchart for explaining the operation when a failure occurs. The following four failure patterns will be specifically explained using the drawings.

(1) If a failure occurs in the high-speed relay line (2) T
If a failure occurs in the DM (3)) If a failure occurs in the IQST (4) If a failure occurs in the high-speed relay line and also in Hr:JST (1) If a failure occurs in the high-speed relay line The case will be explained using the sequence diagram shown in FIG. 3 which shows a case where a failure occurs in the high-speed relay line.

For example, if a failure occurs in high-speed trunk line 1.05, T
DM2 detects this and notifies NCIJ 11.0 that a failure has occurred. NCU 1 that received this notification
0] creates configuration data for connecting a TSDN line between TDM] and TDM 102, and loads the TD old and old SO2. When the configuration data is loaded into the TD old and old software, TDM 1.02 calls TDF'1101 using the TDMol telephone number and requests a link connection via the ISDN network. TDMIOI accepts this request,
When the DN link connection is completed, a network using the 15DN line as a detour is completed, and communication between the HO3T 101 and the terminals is resumed.

(2) When a failure occurs in the TD This will be explained using the sequence diagram shown in FIG. 4 in the case where a failure occurs in the TDM.

When a failure occurs in TDMl, 01, TDMl,,03
detects this as a high-speed relay line failure and
] Notify of the occurrence of a failure. NCUI that received this notification
OI creates configuration data for connecting the 15DN line between TDMIOI and TI)Mi03, and loads it into TDM103.When the configuration data is loaded into TDM103, TDM101 from TDMl,03 to TDM1 Make a call to the telephone number of TD01 to request a link connection via the 15DN network.If TD old 01 does not accept this request due to a failure and rejects it, TD old 01
3 performs the same operation again, but if the number of retries exceeds the preset number, it is determined that TDM1,01 has failed. NC that received notification of TD old/old failure
U 1.01 is a TDMIO connected to I]O3T 102 which has a proxy operation function of IQST 101.
Automatically create configuration data for making a TSDN link connection request to TDM114, which has exactly the same configuration as TDMl, 03.
Reload to . When the configuration data is loaded into the TDM 103, the TDM 3 calls the TDM 114 to the telephone number TDM1, 14 and requests a link connection via the 15DN network. TDM ], I1
4 accepts this request, and when the I5DN link connection between the TDM 103 and the TDM 114 is completed, communication between the terminals of the proxy operation H○5T 118 to NET 1 is performed via the I5DN network.

3) When a failure occurs in the IQST This will be explained using a sequence diagram in the case where a failure occurs in the IQST as shown in FIG.

When a failure occurs in HO3T108, 1. (O3T10
8 - Communication between terminals is interrupted. However, since NCLlo cannot detect this state, communication will continue to be disconnected until the IQST 108 failure is recovered.
o H○5T11 that performs the proxy operation function of S 1108
8 to connect to Iru TDM 1.14 i=Connectable to Iru J
:') L,",',:,NCUIIO4,::Oi, Iko? 1-11 in plN Ci,,l 4.-
, , modifies the stored configuration data and logs this configuration data into TDM 3. TDM]
When the loading of 031\ is completed, a call is made from the TD month 103 to the TDM 114\, TDM114i7) telephone number, and a ring connection request is made via the 15DN network. Tli) Ml, 14 accepts this request (zu, TD
M 1103-TD ], , 14 ISI)N link connection is completed - then via the 15D NIoU line,
Communication between the terminals of proxy operation HcsTts-NET 1 is resumed.

(4) When a failure occurs on the high-speed relay line, H○STi
If a failure occurs in the high-speed relay line (see Figure 3), the same number, river (
○This will be explained using a sequence diagram in the case where a failure also occurs in the ST.

TDl = I 1101 = TI) 103 high-speed relay line (If a failure occurs, the processing for the failure is performed by
(,,,/NCUIIO is TDM 1101=T
Configuration data for connecting the j' circuit between the D 103 and the 15DN line is created and loaded into the T'DM 103. Once the configuration data has been loaded into the TDM 103, a link connection request is made from the TDM 103 to the TDM 10 to make a call to the old telephone number of the TDM 1 via the I5DN network.

TDM, 10J accepts this request, TI) M3
03-TDH] The old l5DN link connection is complete''~4
However, even though the detour via the l5DN network is connected, if communication between terminals to ST 108 is not resumed, the NCU] , NC1, J 1. by command operation on Iol. ], the configuration data stored in ST 108) is installed ((j TDM connected to ST 118)
Connect to 114 and change the number you want. 1 code this configuration data to TDM3, and when loading is completed, TDM 103 to TI)F'l
114/\l5DN network, calls the telephone number of TD A 114 2 and requests a link connection.

TDM] 1.4 accepts the request of J, T1) M103
The l5DN ring connection between ~TDM114 is completed, and l5
Communication between the proxy 1] (jsT 118 and the terminal via the DN line is resumed.

[Effects of the invention] Hereinafter, 1-Explanation force 1=, in the present invention, +1'Q S
A failure occurs in the TDM connected to T or +jOsT,
In the case of 1-, the network management device connects to the IIQsT which performs the alternate operation function of the HQST of the faulty network. ++ TDI'l I\\, which has exactly the same configuration as the TDM connected to the failure node work ++ OS T,
Make a detour connection from the operational TDH of the faulty network via the 15DN line.
Since it becomes possible to perform communication between T and terminals, failures occurred in the conventional network configuration1]○S co' or T
It is possible to immediately resume ζJ communication that was not possible until D- recovers, and to use Ho5T of other networks to act on behalf of ζJ.
By installing a detour route through the 5DN network, it is possible to provide an economical network system. 1 In addition, the redundant configuration of installing a TDM with the same configuration as the TDH connected to the HQST proxy function (O5T4~) has a synergistic effect that greatly improves the reliability of the network. .

[Brief explanation of the drawing]

Figure 1 is a network configuration diagram of an embodiment of the present invention, Figure 2 is a network configuration diagram of an embodiment of the present invention.
Figure 3 is a flowchart to explain the operation when a failure occurs.
, Figure 4 is an explanatory diagram of the operation when a failure occurs in the TDM.
．． Fig. 5 is an explanatory diagram of the operation when a failure occurs in the HQST, and Fig. 6 is an explanatory diagram of the operation when a failure occurs in the high-speed trunk line and +ROSR (7). 7 is a conventional network configuration diagram, and FIG. 8 is a diagram in which a backup 110ST and an additional TDM are added to the network system configuration of FIG. 7. 101-104., ], ], 1- 114...
TDM105.11.5...High-speed trunk line 106, 107.116.117...User line 1.08,118...I(○5T109
．． 1.19 ...Terminal 101.120 ・
...Network management device 12] ......
・ISDN line 701 ・・・・・・・・・・・・
・ HO3T702-706 ・・・・・・ TI) and 70'7 ・・・・・・・・・High-speed relay line 708 ・・・・・・・・・・・・Ami-takeri equipment 709
......... Relay line 71, 0 via public network ...... User line 71
] ・・・・・・・・・・・・)i0sT~terminal communication path 712 ・・・・・・・・・・・・HO5T~terminal communication path 7 via public network] 3...・・・・・・Terminal

Claims (1)

[Claims] 1. In a failure countermeasure method for a network system that has two or more groups of networks that connect a host computer and multiple terminals via high-speed relay lines via a multiplexing device, the first method is to provide proxy functions between the host computers and
A multiplexing device having the same configuration as the first multiplexing device connected to the host computer is connected to a second host computer that operates on behalf of the first host computer or the second multiplexing device. When a failure occurs, a second host computer in another network that has a substitute operation function for the first host computer in the network where the failure has occurred is sent to an operable second host computer in the network where the failure has occurred.
The present invention is characterized in that communication between the failed host computer and the terminal is shortened, and communication between the substitute host computer and the terminal is performed by accessing from the multiplexing device via the ISDN network and establishing a detour connection. A fault countermeasure method for network systems.