JPH021662A - Trunk circuit blocking system for packet exchange network - Google Patents

Abstract

PURPOSE:To always secure a logical information line with a network controller by permitting a packet exchange equipment to reject the blocking instruction of a trunk circuit when the packet exchange equipment judges that the logical information line to be used by itself is eliminated. CONSTITUTION:When the network controller N4 transmits a circuit blocking signal which blocks a trunk circuit L31 to the packet exchange equipment P3, the P3 transmits a setting request signal to U10 through a logical information line setting part U30 and L31 in such a way that the logical information line is caused to be newly set between U10 and N4. When L31 is blocked here, it is judged that the logical information line cannot be set between P1 and N4, and P1 cannot receive setting recognition information from N4. A logical information line setting impossible signal is returned to P3 through L31 and U30. The P3 which has received the signal rejects the blocking instruction of L31 from N4 while P1 becomes independent of the packet exchange network.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a relay line blocking method for a packet switching network, and particularly to a packet switching network in which a packet switching device rejects a relay line blocking command to secure a logical information path. This invention relates to a trunk line blocking method.

[Conventional technology]

Conventionally, in this type of packet switching network, when a relay line between packet switching devices is blocked, it is difficult to determine whether or not that packet switching device will disconnect from the logical information path with other packet switching devices. In other words, the packet switching device does not check whether the control information can be transmitted from the network management device, and the check is left to the judgment of the operator of the network management device.

[Problem to be solved by the invention]

In the conventional packet switching network described above, even if it is not guaranteed that the logical information path between the packet switching device and the network management device is secured, when the packet switching device receives a line blocking command from the network management device, it is unconditionally applicable. Therefore, there is a risk that the logical information path between the packet switching device and the network management device will be cut off.

On the other hand, since the network management device collectively controls the packet switching device using the logical information path, there is a problem that if the logical information path is not established, the packet switching device cannot be controlled forever.

An object of the present invention is to have each packet switching device determine whether or not there is a logical information path that it uses, and when it is determined that there is no logical information path available, the packet switching device that is controlled by the network management device performs a relay. An object of the present invention is to provide a relay line blocking method for a packet switching network, which always secures a logical information path with a network management device by rejecting a line blocking command.

[Means to solve the problem]

The relay line blocking method for a packet switching network according to the present invention provides a packet switching network configured with a plurality of packet switching devices and a network management device that controls each of the packet switching devices that have sent control information, in which each of the packet switching devices ,
comprising a logical information path setting unit that itself sets a logical information path with the network management device and relays the logical information path from another packet switching device to the network management device;
In response to a line blocking command included in the control information sent via the logical information path, the packet switching device including itself is controlled to block a designated relay line with another packet switching device. At this time, the logical information path setting unit in each packet switching device, which is the setting unit for the plurality of logical information paths set on this trunk line, does not use the trunk line or the trunk line that is already blocked. When a new logical information path setting operation is performed and the settings of all logical information paths are confirmed, this relay line is blocked and the logical information path is configured using any of the available relay lines. The method is characterized in that the line blocking command is rejected if there is even one logical information path setting unit in the packet switch that cannot receive setting confirmation information from the network management device to be confirmed.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a relay line blocking system for a packet switching network according to the present invention.

The packet network in this embodiment is composed of three packet switching devices (hereinafter referred to as P') 1, 2.3 and a network management device (hereinafter referred to as N) 4, and each Pi, 2.3
is the logical information path setting unit (hereinafter referred to as U>10.20.30
The UIO and U20 stations have a relay line (hereinafter referred to as below).
12, LJ20 and 030 are connected by L23, U30 and U10 are connected by L31, N4 and U2
0 are connected by L42.

UIo and 20.30 each set up a logical information path with N4 and relay the logical information path to U of Ike, and also reject a line block command from N4 when the setting of the logical information path cannot be confirmed. Has a function.

In addition, N4 sends control information to the set logical information path to control each Pi, 2.3, and also sends control information to each L
12.23.31 including a line blocking command to be sent.

Next, the operation of this embodiment will be explained.

Here, Ulo is Pi-010-L12-U20-L42
A logical information path (hereinafter referred to as RTIN) of Pl is set on the path of -N4, and U30 is P3-U30-L2B-U20-
It is assumed that a logical information path (hereinafter referred to as RT3N) is set on the path L42-N4.

In this state, N4 uses RTIN to connect L1 to Pl.
2, tJ10 selects another trunk line (that is, LSI in this case) and connects it to PL-UIO-LSI-U30-1, 23-020.
-L42-N4 route is the logical information path (hereinafter referred to as RT
13N), and Pl receives the setting confirmation information from N, 1 via U10! -12 is occluded.

As a result, the RIN is disconnected. After that, N4 sends control information for controlling Pl using RT13N.

In this situation, N4 uses R73N to send LS to R3.
When a line blocking command is sent to block I, R3 closes U30.
．． A setting request signal is sent to the UIO via the LSI to establish a new logical information path with N4. but,
When UIO receives the packet-level disconnection instruction packet from P], [5]2 is already blocked, so if the LSI is blocked here, it will no longer be possible to set up a logical information path between Pl and N4, and Pl determines that it will no longer be able to receive the setting confirmation information from N4, and sends it to R3 via LSI and U30.
A logical information path setting disable signal is returned to .

When R3 receives this logical information path setting disable signal, Pl
determines that the LSI is isolated from the packet switching network, rejects the LSI block command sent from N4, and secures R13N without blocking the LSI.

〔Effect of the invention〕

As explained above, in the present invention, when a relay line of a packet switching device is blocked by a line blocking command from a network management device, when the logical information path from the screw 1 to the work management device is disconnected, the relay line is By blocking the requested line only when it is confirmed that all logical information paths have been set without using the line, the packet switching equipment is not isolated, so the network management equipment can This has the effect of preventing the packet switching device from becoming uncontrollable when a relay line blockage command is issued.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a relay line blocking system for a packet switching network according to the present invention. . 1.2.3... Packet switching device (P), 4... Network management device (N), 10, 20.30... Logical information path setting unit (U), 12.23, 31.42 ...
Relay line (L). Figure 7

Claims (1)

[Claims] In a packet switching network configured with a plurality of packet switching devices and a network management device that controls each of the packet switching devices that sent control information, each of the packet switching devices has a logical information path between it and the network management device. A logical information path setting unit configured by itself to relay a logical information path from another packet switching device to the network management device; When controlling a packet switching device that includes the receiving device and blocking a specified relay line between it and another packet switching device, the setting source of multiple logical information paths set on this relay line is The logical information path setting unit in each packet switching device performs a new logical information path setting operation without using the relay line or the already blocked relay line, and confirms the settings of all logical information paths. If the relay line is blocked, the configuration of the logical information path is confirmed by using any of the available relay lines. A relay line blocking method for a packet switching network, characterized in that the line blocking command is rejected when even one setting unit exists.