KR20020049330A - Signaling Route Test Method In PNNI Network - Google Patents

Abstract

PURPOSE: A signaling path testing method of a PNNI(Private Network Node Interface) network is provided to check a signaling path state of a network by testing a signaling path by including a test related information factor in a signaling message processed in a PNNI network, and quickly cope with a problem in the network by accurately recognizing its cause when the signaling path is in an abnormal state. CONSTITUTION: An originating node of a PNNI network to test a signaling path selects a signaling path up to a destination node by using a source routing method(S61), generates a set-up message including a rough testing information factor(S62), and sets a path connection to the next node on the basis of topology information for signal processing(S63). The originating node checks whether it is normally connected to the next node(S64). If originating node is normally connected, it transmits a set-up message including the path testing information factor to the next node through the connected path(S65). The next node analyzes the set-up message to check whether itself is the final destination node(S65). If the next node itself is the final destination node, since the set-up message has been normally received from the originating node, the next node generates a release message including an information factor indicating that the path testing result is normal(S67), records its own node information in the path testing route information factor of the release message, and transmits it to the previous node according to the signaling path connected to the originating node(S68). The previous node analyzes the release message to check whether itself is the final originating node(S69). If the previous node itself is the final originating node, it analyzes the information factor included in the release message, that is, the path testing result information factor and the path testing route information factor to check whether the signaling path is in a normal state or not(S70).

Description

Signaling route test method in PNNI network

The present invention relates to a signaling path test method in a private network node interface (PNNI) network. In particular, an information element for path test is included in a setup message and a release message, which are signaling messages in a network, and a path test is performed using the same. By doing so, the present invention relates to a signaling path test method in a PNNI network capable of identifying a signaling path state.

Recently, with the expansion of the Internet network and the increase of data traffic, there is a growing interest in the Private Network Node Interface (PNNI), which is effective in providing various multimedia communication services and data services. NNI protocol in private networks, proposed as a standard in 2011, consisting of routing and signaling protocols.

Here, in the conventional PNNI routing, as the network size increases, as the components in the network change, the PNNI routing supports the dynamic routing in which the corresponding information flows into the network so that the network resources can be efficiently used. Source routing based on topology information distributed between nodes, that is, information in the network expressed as a PNNI Topology State Element (PTSE), which is the minimum unit of routing information (all link information, topology state information, and reachability information of each node). By establishing a connection.

That is, in the PNNI network, topology information is exchanged between nodes. For this purpose, a dynamic routing protocol includes a Hello Protocol, a database (information collected by the PNNI routing protocol), and a Database Synchronization Protocol. When the topology information in the network is delivered to each node through this protocol, the PNNI network is in a steady state.

When the PNNI network is in a normal state, the switched virtual channel (SVC) / switched virtual path (SVC), which is a virtual circuit for discontinuous channels and paths between all nodes in the network, that is, a routing control channel and a path between logical group nodes. SVP; Switched Virtual Path can be set up.

However, in the conventional PNNI network, if the connection setup of the switched virtual channel / switched virtual path fails between nodes in the network, the network operator must analyze the reason for the failure of the connection setup. As the reason for the failure is analyzed using the bay, it is difficult to accurately analyze the reason for the failure in the case of a large network, which makes it difficult to accurately determine the state of the path where the actual call is established and released.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to include a path test related information element in a signaling message processed in a PNNI network so as to test a signaling path so that the signaling path state in the network can be checked. At the same time, if the signaling path is in an abnormal state, the reason for this is precisely understood so that it can be quickly responded to.

1 is a diagram illustrating a path test information element included in a setup message which is a signaling message in the present invention.

2 is a diagram illustrating a path test result information element included in a release message which is a signaling message in the present invention.

3 is a diagram illustrating a path test route information element included in a release message which is a signaling message in the present invention.

4 is a diagram illustrating a path test procedure when a signaling path in a network is normal in a PNNI network according to the present invention.

5 is a diagram illustrating a path test procedure when the signaling path in the network is abnormal in the PNNI network according to the present invention.

6 is a flowchart illustrating a signaling path test procedure in a PNNI network according to the present invention.

According to an aspect of the present invention, there is provided a method including: transmitting a setup message including a path test information element by connecting a signaling path with a next node according to a signaling path selected to a destination node; Generating a release message including an information element indicating that a path test result is normal when a setup message is normally received at the called node; Transmitting the release message to a previous node according to a signaling path connected to an originating node, wherein each node further records and transmits its own node information; The present invention provides a signaling path test method in a P & I network including analyzing a information element included in a release message in the originating node and checking a signaling path state.

Furthermore, in the above-described signaling path test method in the P & I network, the path test result is abnormal when the signaling path with the next node is not normally connected in the process of transmitting the setup message including the path test information element. Generating a release message comprising an indicating information element; The method may further include recording connection failure information in the path test result / root information element of the release message and transmitting the connection failure information to the previous node, and additionally recording and transmitting its own node information.

In the checking of the signaling path state, the path test result / root information element included in the release message is analyzed to determine whether the signaling path is in a normal state or an abnormal state, and in the abnormal state, a reason for connection failure. Characterized in that.

Furthermore, the path test route information element of the release message may include a path test route information element identifier field, a length information field of the path test route contents, a node number field indicating the number of nodes included in the path, and a connection via And a node identifier field to which one node information is added.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the PNNI network according to the present invention, a predetermined information element is added to a setup message and a release message, which are signaling messages processed in the network, and then a signaling path is tested using the same. A state determination on a path to be set and released is performed. An information element added to a PNNI signaling message will be described as follows.

First, the setup message includes a path test information element as shown in FIG. 1, which includes a path test information element identifier field indicating that the current connection configuration is for testing, and a path test type. (Information indicating a type of path test) (that is, information indicating a PNNI path test) is included.

Second, the release message includes a path test result information element as shown in FIG. 2 attached to the path test result information element. The path test result information element includes a path test result information element identifier field indicating that the current disconnection is for a test, and a corresponding path test result. A result field indicating whether the path is normal or abnormal is included. If the path test result is abnormal, a value indicating the reason is displayed, and additional information fields on why the result is abnormal are further included. .

That is, in the result field, a value of '0' is displayed if it is normal, and one of '1 ~ 8' is displayed if it is abnormal, and if it is '1', an invalid Virtual Path Connection Indentifier (VPCI) / It indicates that a virtual channel identifier (VCI) has been allocated, '2' indicates an invalid cell transmission rate, and '3' indicates an unsupported service category. '4' indicates that signaling ATM Adaptation Layer (SAAL) setup failed, '5' indicates that no link could be found and could not be routed to the destination node, and '6' indicates that the cell transmission rate matches Could not be found and could not be routed to the destination node (connection establishment failed). '7' indicates that the service category could not be routed to the destination node because no matching link was found, and '8' indicates that the service node could not be routed to the destination node for other reasons.

The additional information field may include a Blocked Node Identifier field, a Type of port field, a Blocked Port Identifier field, a VPCI field, and a VCI field. The Blocked Node Identifier field is a field indicating a node that failed the path test. It is included when the result field value has any one of '1 to 8', and the corresponding port type field indicates that the path test is performed on a specific port. Field that indicates the corresponding port type ('Ingress' for input port or 'Egress' for output port) when it fails, and is included when the result field value has any one of '1 ~ 4'. to be.

The Blocked Port Identifier field is a field that indicates the port on which the path test failed, and is a field included when the result field value has any one of '1 to 4', and the VPCI / VCI field indicates which VPCI / VCI. This field indicates whether or not the path test failed while allocating a value. This field is included when the result field value is '1'.

In addition, the release message includes a path test result information element as shown in FIG. 3 in addition to the path test result information element. The path test route information element includes path information where the test connection is set up, that is, connection. An information element including order information of a node that has been configured, a path test route information element identifier field, a Number of node field indicating the number of nodes included in a corresponding path, and It includes a Node Identifier field to which information is added in reverse order.

The path test procedure using the PNNI signaling message including the information elements defined as described above proceeds as follows. Referring to FIG. 4 attached to the path test procedure when the signaling path in the network is normal in the PNNI network according to the present invention. The description is as follows.

First, when performing a path test from node A to node D, the node A includes a path test information element indicating the type of path test in the setup message (path test = 0x01) and transmits it to node B. Node B and Node C process the setup message in the same way as the general call setup procedure and send it to the destination node, Node D.

Then, the node D checks the path test information element included in the setup message, and terminates the path test because the node D is the final destination node.

Subsequently, the node D releases a path test result information element indicating a path test result and a path test route information element including order information of the node that performed the path test (path test result = 0x00) (to the path test route). Add node D) and transmit it to node C. At this time, since the currently tested path is normal, a value of '0' indicating normal is recorded in the result field of the corresponding path test result information element, and the corresponding path test route It records its node information in the node identifier field of the information element.

Then, the corresponding node C and node B record their own node information (add node C and node B to the path test route) in the node identifier field of the path test route information element included in the release message, and then return to node A. Will be sent.

Accordingly, the node A receiving the release message analyzes the path test result information element (path test result = 0x00) and the path test route information element (node D, node C, and node B). You know it's normal.

Meanwhile, in the PNNI network according to the present invention, the path test procedure in the case where the signaling path in the network is abnormal will be described with reference to FIG. 5. Here, the case where the port band is insufficient in the path between the node C and the node D is described. It will be described assuming.

First, when a path test from node A to node D is to be performed, the node A includes a path test information element indicating a path test type in a setup message (path test = 0x00) and transmits it to node B. Node B processes the setup message and sends it to Node C in the same way as a normal call setup procedure.

Then, the node C attempts to send a setup message to the node D, but fails to establish a call due to lack of port bandwidth of the path connected to the node D. Thus, the path test result information element indicating the path test result and the path Releases the path test route information element, which contains the order information of the node that performed the test (path test result = 0x02, blocked node = node C, blocked port = 100, port type = input port) (to the path test route). Add to node C) and transmit to node B. In this case, since call setup failed due to insufficient port bandwidth, a value of '2' indicating that the cell transmission rate is not valid in the result field of the corresponding path test result information element. The node information (node C) in the Blocked Node Identifier field, the information indicating the input port in the Port Type field, and the block in the Blocked Port Identifier field. It records the port information, respectively, will record its own node information (node C) "1" of the node number included in the path to the node number field in the test path route information element, a node identifier field.

Then, the Node B records its node information as Add (Add Node B to Path Test Route) in the Node Identifier field of the path test route information element included in the release message, and transmits it to Node A.

Therefore, the node A receiving the release message receives the path test result information element (path test result = 0x02, blocked node = node C, blocked port = 100, port type = input port) and the path test route information element (node C). We analyze node B) and find that there is a problem with a specific port of node C.

Meanwhile, the signaling path test procedure in the PNNI network operating as described above will be described in detail with reference to FIG. 6 as follows.

First, the originating node in the PNNI network to test the signaling path selects the signaling path to the destination node using the source routing method (step S61), and then sets up a setup message including a predetermined path test information element. In step S62, a path connection for signaling processing is established with the next node based on the topology information (step S63).

Subsequently, it is checked whether it is normally connected to the next node (step S64), and if it is normally connected, a setup message including the path test information element is transmitted to the next node through the connected path (step S65). In step S66, it analyzes the setup message to determine whether it is the last destination node (step S66).

At this time, if the node is not the final destination node, it returns to step S63 for establishing a connection with the next node based on the topology information, and performs a repetitive operation, thereby generating a setup message including the path test information element received from the previous node. Will be sent to the next node.

In step S66, if it is the last called node, since the setup message is normally received from the originating node, a release message including an information element indicating that the path test result is normal is generated (step S67). The node information is recorded in the path test route information element and transmitted to the previous node according to the signaling path connected with the originating node (step S68).

Then, the previous node analyzes the release message to determine whether it is the last originating node (step S69), and if it is not the last originating node, records its node information in the path test route information element of the release message and transfers it. By repeating the operation of step S68 of transmitting to the node, all node information passed through for the path test is recorded in the node identifier field of the path test route information element.

On the other hand, if it is not normally connected to the next node in step S64, since the connection with the next node fails and the setup message is not processed normally, after generating a release message including an information element indicating that the path test result is abnormal (step In step S71), connection failure information (connection failure resource, connection failure reason, etc.) is recorded in the path test related information element of the corresponding release message, that is, the path test result information element and the path test route information element, and transmitted to the previous node (step). S72).

Then, the previous node performs the operation of step S69 by analyzing the release message to check whether it is the last originating node.

Subsequently, if it is the last originating node in step S69, the information element included in the release message, that is, the path test result information element and the path test route information element is analyzed, and whether the signaling path is normal with the corresponding test result or abnormal. It is possible to check whether or not the state (step S70), and if the corresponding signaling path is in an abnormal state, the reason can be determined.

As described above, in the PNNI network according to the present invention, by including a predetermined information element for the path test in the signaling message, and then test the signaling path using it, the signaling path state in the network can be confirmed, the corresponding signaling path If is an abnormal state, the reason can be accurately understood.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention can test the signaling path by including the path test related information element in the signaling message processed in the PNNI network, thereby not only checking the signaling path state in the network, but also when the signaling path is abnormal. The reason for this is to accurately grasp the reason, and thus it is possible to quickly cope with problems in the network.

Claims (4)

Connecting a signaling path with a next node according to the selected signaling path to the destination node and transmitting a setup message including a path test information element; Generating a release message including an information element indicating that a path test result is normal when a setup message is normally received at the called node; Transmitting the release message to a previous node according to a signaling path connected to an originating node, wherein each node further records and transmits its own node information; And checking the signaling path state by analyzing the information elements included in the release message at the originating node. The method of claim 1, Generating a release message including an information element indicating that a path test result is abnormal when a signaling path with a next node is not normally connected in the step of transmitting a setup message including the path test information element; In the P & I network, the connection failure information is recorded in the path test result / root information element of the release message and transmitted to the previous node, and further recording and transmitting the respective node information. Signaling path test method. The method of claim 1, The checking of the signaling path state may include analyzing a path test result / root information element included in a release message to determine whether the signaling path is in a normal state or an abnormal state, and in case of an abnormal state, to identify a reason for connection failure. Characterized in the signaling path test method in P & I network. The method according to any one of claims 1 to 3, The path test route information element of the release message may include a path test route information element identifier field, a length information field of the path test route contents, a node number field indicating the number of nodes included in the path, and a node passed through when establishing a connection. And a node identifier field to which information is added.