JP2000253041A - Node position detector and node position detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily detect a node being a detection object on a network and to simplify the configuration of the network. SOLUTION: A node position detector is provided with a learning medium access control MAC table acquisition section 1 that collects table information denoting a relay destination port of each node in each bridge and port information denoting a pre-designated port from bridge ports connected to each segment from each bridge and with a MAC table management section 2 storing the table information and the port information. The detector is further provided with a retrieval MAC address input section 3 that receive a MAC address being a position detection object and with a position information retrieval section 4 that retrieves the node position information from the information of the MAC table management section 2 by using the MAC address entered to the retrieval MAC address input section 3 as a retrieval key.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a node position detecting device and a node position detecting method suitable for a network to which a plurality of Ethernets (registered trademark) are connected, and more particularly, to a node position which simplifies an applied network. The present invention relates to a detection device and a node position detection method.

[0002]

2. Description of the Related Art Conventionally, a plurality of Ethernets (Ethernet)
In a network in which segments (hereinafter, referred to as segments) are interconnected by a data link layer, frames are relayed between the segments by a medium access control (MAC) bridge device (hereinafter, referred to as a bridge). .

In such a bridge, a destination MAC address of a frame received from a connected segment is checked, and a segment to be relayed next is determined based on a learning MAC table in the bridge.
Here, the learning MAC table is used as a database for determining a relay destination for each node in the entire network.

In general, even when redundant connections are made between bridges, a spanning tree protocol is used to prevent a topological closed loop from being generated. One designated bridge port is determined for each segment.

However, in such a conventional Ethernet, when an abnormal MAC frame appears on the network when a failure occurs, the source MAC of the frame is transmitted.
Even if the address is known, it has been difficult to specify the position information on which segment the transmission source device is located.

Therefore, a method has been proposed in which an event detecting device provided with time information transmitting / receiving means is connected to both ends of a node unit group to detect a distance from each node unit (Japanese Unexamined Patent Publication No. Hei 8 (1996) -108). No. 107423).

[0007]

However, in the node position detecting system described in Japanese Patent Application Laid-Open No. 8-107423, it is necessary to connect an event detecting device to each node unit group, that is, to both ends of a segment. , In networks where multiple segments are interconnected,
There is a problem that the configuration becomes complicated.

The present invention has been made in view of such a problem, and a node position detecting device capable of easily detecting a node to be detected on a network and simplifying the configuration of the network. And a node position detecting method.

[0009]

SUMMARY OF THE INVENTION A node position detecting apparatus according to the present invention detects a position of a node in a network in which a plurality of segments to which one or more nodes are connected are connected via a bridge. In the node position detecting device, table information indicating a relay destination port of each node in each bridge and port information indicating a port designated in advance from ports of the bridge connected to each segment are stored in each bridge. And a search unit that searches for a node to be detected in association with the table information, the port information, and a medium access control address indicating the node to be detected. .

In the present invention, table information indicating the relay destination port of each node in each bridge collected and stored in the information collecting and storing unit and a port designated in advance from the ports of the bridge connected to each segment are stored. Since the node to be detected is searched by the search unit in association with the indicated port information and the medium access control address indicating the node to be detected, the object to be detected can be reliably detected. In addition, if one device is connected to the network, all nodes can be detected, so that the network can be simplified.

In the present invention, it is possible to have an address input unit to which the medium access control address is input and supplies the medium access control address to the search unit.

A node position detecting method according to the present invention is a node position detecting method for detecting a position of a node in a network in which a plurality of segments to which one or more nodes are connected are connected via a bridge. Collecting and storing, from each of the bridges, table information indicating a relay destination port of each node in each of the bridges and port information indicating a port designated in advance from ports of the bridge connected to each of the segments; And searching for a node to be detected in association with the table information, the port information, and a medium access control address indicating the node to be detected.

In the present invention, the step of searching for a node to be detected includes the step of setting the specified port of one segment as a reference address, and the step of selecting the same port as the reference address from all the bridges. Selecting a bridge having the designated port; and selecting a relay destination port of the detection target node in the selected bridge from the table information in association with a medium access control address indicating the detection target node. And comparing the specified port of the segment to which the selected relay destination port is connected with the reference address in association with the port information.

[0014] Further, after the step of comparing the designated port with the reference address in association with the port information, when the designated port and the reference address do not match, the selected port is selected. Repeating the process from the step of selecting the bridge using the specified port of the segment to which the relay destination port is connected as a new reference address until the specified port matches the reference address. Can be.

Further, as a post-process of collecting and storing the table information and the port information from each of the bridges, there may be provided a process of inputting the medium access control address to a node position detecting device.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a node position detecting device according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. The node position detecting device according to the present embodiment is used for Ethernet, and when an abnormal MAC frame appears on the network when a failure occurs, the position of the segment on which the source device of the frame exists is determined. It specifies information. FIG. 1 is a block diagram showing a node position detecting device according to an embodiment of the present invention.

The node position detecting device 11 according to the present embodiment is provided with a learning MAC table acquisition unit 1 connected to one segment on a network. The learning MAC table acquisition unit 1 is a part that requests and acquires learning MAC table information and port information including a designated bridge port from a bridge on the network. The learning MAC table information is information indicating a relay destination port of each node in each bridge, and the designated bridge port is a port designated in advance from ports of bridges connected to each segment.

Also, the learning MAC table acquisition unit 1
Stores and manages information obtained from each bridge.
The AC table management unit 2 is connected. In the present embodiment, the learning MAC table acquisition unit 1 and the MAC
The table management unit 2 constitutes an information collection and storage unit.

Further, a search MAC address input unit 3 for inputting a MAC address to be subjected to position detection is provided.

The location information search unit 4 for searching for the location information of the node from the information of the MAC table management unit 2 using the MAC address input to the search MAC address input unit 3 as a search key is used. It is connected to the address input unit 3.

Here, a search method in the position information search unit 4 will be described. FIG. 2 is a flowchart showing a search method in the position information search unit 4.

First, a designated bridge port of a segment to which the own device is connected is set as a reference address M (step S1).

Next, a bridge having the same designated bridge port p as the reference address M is selected from all the bridges, and the selected bridge is set to B (step S).
2).

Next, the learning MAC table of the bridge B is searched using the MAC address input to the search MAC address input unit 3 as a search key, and the relay destination port P
Is selected (step S3).

Then, the designated bridge port M 'of the selected relay destination port P is compared with the reference address M (step S4).

As a result, when the reference address M matches the designated bridge port M ′, the search target node is connected on the segment connected to the port P of the bridge B, and the node position is changed. It is specified (step S5). On the other hand, if the reference address M and the designated bridge port M ′ do not match, the designated bridge port M ′ of the relay destination port P is set as a new address M (step S
6) The process from step S2 is repeated until the reference address M matches the designated bridge port M '.

Next, a network to which the node position detecting device according to the present embodiment configured as described above is applied will be described. FIG. 3 is a schematic diagram illustrating a configuration of a network to which the node position detecting device according to the present embodiment is applied.

The network to which the node position detecting device 11 of this embodiment is applied is provided with four segments SEG1 to SEG4. And the segment SE
A bridge B1 is provided in which a port p11 is connected to G1 and a port 12 is connected to a segment SEG2.
Similarly, a bridge B2 having a port p21 connected to the segment SEG2 and a port 22 connected to the segment SEG3 is provided, and a bridge B3 having a port p31 connected to the segment SEG3 and a port 32 connected to the segment SEG4. .

In the bridge B1, a MAC address M11 is set on the port p11 side, and a MAC address M12 is set on the port p12 side. Similarly, the bridge B2 has a MAC address M21 on the port p21 side.
Is set, and the MAC address M22 is set on the port p22 side. In the bridge B3, the MAC address M31 is set on the port p31 side, and the M address is set on the port p32 side.
An AC address M32 is set. In FIG.
The underlined MAC address is the designated bridge port on that segment. That is, segment S
The designated bridge port of EG1 is MAC address M11, and the designated bridge port of segment SEG2 is MA
The C address is M12, and the designated bridge port of the segment SEG3 is the MAC address M31.

Then, the node N1 is added to the segment SEG1.
Are connected, the node N2 is connected to the segment SEG2, and the node N3 is connected to the segment SEG3. Further, the node position detecting device 11 has a segment SEG.
1 connected.

Next, the operation of the present embodiment in a network to which the node position detecting device according to the present embodiment configured as described above is applied will be described.

First, the learning MAC table acquisition unit 1
Acquires the learning MAC tables and port information from the bridges B1 to B3, and the MAC table management unit 2 manages these learning MAC tables and port information. Tables 1 to 3 below show learning MACs of bridges B1 to B3 in the network shown in FIG.
Tables 4 to 6 show port information of the bridges B1 to B3 in the network shown in FIG.

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

[Table 3]

[0036]

[Table 4]

[0037]

[Table 5]

[0038]

[Table 6]

As shown in Tables 4 to 6, the port information includes the MAC address of the port owned by the bridge and the designated bridge port of the segment connected to the port.

Next, the MAC address of the node to be searched is input to the search MAC address input unit 3. Here, it is assumed that the node N2 is input as an example.

[0041] When the MAC address of the search target node is entered in the search MAC address input section 3, the location information searching unit 4 focuses the designated bridge port M ₁₁ segments that are connected, the port of each bridge Search a table of information. Here, since the node detection device is connected to the segment SEG1, the port information of the bridge B1 is first selected and searched.

Next, the location information search unit 4 searches the learning MAC table (Table 1) of the selected bridge B1 using the MAC address of the search target node N2 as a search key, and selects the relay destination port. Here, as shown in Table 1, the port p12 is selected.

Then, the position information search unit 4 compares the designated bridge port of the selected relay destination port p12 with the previous reference address. Here, from Table 4, the designated bridge port of port p12 is M12, and the reference address is M12.
Since they are 11, they do not match.

Therefore, the position information search unit 4 sets a new reference address to M12 and repeats the processing. That is, a table of port information of each bridge is searched from the reference address M12. Here, the port information of the bridge B2 having the designated bridge port that matches the designated bridge port M12 of the port p12 is secondarily selected and searched.

Next, the location information search unit 4 searches the learning MAC table (Table 2) of the selected bridge B2 using the MAC address of the search target node N2 as a search key, and selects the relay destination port. Here, as shown in Table 2, the port p21 is selected.

Then, the position information search section 4 compares the designated bridge port of the selected relay destination port p21 with the previous reference address. Here, from Table 5, the designated bridge port of port p21 is M12, and the reference address is M12.
Since they are 12, they match.

As a result, the node N2 to be searched is the segment SEG2 to which the port p21 of the bridge B2 is connected.
It is specified that it exists above.

As described above, according to this embodiment, since the learning MAC table and the port information are previously collected from each bridge by the learning MAC table acquisition unit 1, the node to be searched is input to the search MAC address input unit 3. By inputting, it is possible to easily search in which segment the node exists. For this reason, it is possible to easily specify the failed node and disconnect it from the network.

Further, even in a network in which a plurality of segments are interconnected, each node can be detected with only one search device, so that the configuration of the network is simplified. The segment on the network to which the node position detecting device is connected is not particularly limited.

[0050]

As described in detail above, according to the present invention,
Table information indicating the relay destination port of each node in each bridge collected and stored in the information collection storage unit, port information indicating a port designated in advance from the ports of the bridge connected to each segment, and the node to be detected Since the search unit for searching for a node to be detected is provided in association with the medium access control address indicating, the detection target can be reliably detected. Therefore, it is possible to easily specify the failed node and disconnect it from the network. In addition, if one device is connected to the network, all the nodes can be detected, so that the network can be simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a node position detecting device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a search method in a position information search unit 4;

FIG. 3 is a schematic diagram illustrating a configuration of a network to which the node position detecting device according to the embodiment is applied;

[Explanation of symbols]

1: learning MAC table acquisition unit 2: MAC table management unit 3: search MAC address input unit 4: location information search unit 11: node position detection device N1, N2, N3; nodes M11, M12, M21, M22, M31, M32 ; M
AC address p11, p12, p21, p22, p31, p23; port SEG1, SEG2, SEG3, SEG4; segment B1, B2, B3; bridge

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K030 GA12 GA14 HC14 HD03 JA10 KA04 KA05 MA13 MB20 MD09 5K032 AA09 CA08 DA06 DB19 DB22 DB28 EC03 5K033 AA09 CA08 DA05 DB12 DB14 DB18 DB20 EA07 EC03 9A001 CZ03 CZ07 KK56 LL05

Claims (6)

[Claims] 1. A node position detecting device for detecting a position of a node in a network in which a plurality of segments to which one or two or more nodes are connected via a bridge is provided. An information collection storage unit that collects and stores, from each of the bridges, table information indicating a relay destination port of the bridge and port information indicating a port designated in advance from ports of the bridge connected to each of the segments; And a search unit for searching for the node to be detected in association with the port information and a medium access control address indicating the node to be detected. 2. The node position detecting device according to claim 1, further comprising an address input unit to which said medium access control address is inputted and which supplies said medium access control address to said search unit. 3. A node position detecting method for detecting a position of a node in a network in which a plurality of segments to which one or two or more nodes are connected via a bridge is provided. Collecting and storing, from each of the bridges, table information indicating a relay destination port and port information indicating a port designated in advance from ports of the bridge connected to each of the segments, and the table information and the port Searching for the node to be detected in association with information and a medium access control address indicating the node to be detected;
A node position detecting method comprising: 4. The step of searching for a node to be detected includes the step of setting the specified port of one segment as a reference address, and the step of searching the specified port which is the same as the reference address from all the bridges. Selecting a bridge having a port that has been detected, and selecting a relay destination port of the detection target node in the selected bridge from the table information in association with a medium access control address indicating the detection target node, 4. The node position according to claim 3, further comprising: comparing the designated port of the segment to which the selected relay destination port is connected with the reference address in association with the port information. Detection method. 5. A step after the step of comparing the designated port and the reference address in association with the port information, when the designated port does not match the reference address, Repeating the process from the step of selecting the bridge using the specified port of the segment to which the relay destination port is connected as a new reference address until the specified port matches the reference address. The node position detecting method according to claim 4, wherein: 6. The method according to claim 1, further comprising a step of inputting the medium access control address to a node position detecting device as a post-process of collecting and storing the table information and the port information from each of the bridges. The node position detection method according to any one of claims 3 to 5.