JP5669197B2 - Network failure detection apparatus, method and program - Google Patents

Description

  The present invention relates to a fault detection of an Ethernet (registered trademark) network, and more particularly to a fault detection apparatus, a method, and a program for detecting a fault occurring in an Ethernet switch having an Energy Efficient Ethernet function and estimating the fault occurrence point. is there.

  In IEEE (The Institute of Electrical and Electronics Engineers), a technology for realizing power saving of an apparatus by suspending and recovering the interface based on the utilization rate of the Ethernet interface is standardized. This is called “Energy Efficient Ethernet (EEE) technology” (Non-patent Document 1).

IEEE802.3az, “Energy Efficient Ethernet“ IEEE802.1ag, “Connectivity Fault Management” ITU-T Y.1731, “OAM functions and Mechanisms for Ethernet based Networks” IETF RFC1157, “A Simple Network Management Protocol (SNMP)” IETF RFC1213, “Management Information Base for Network Management of TCP / IP-based internets: MIB-II”

  Here, problems that may occur when the Energy Efficient Ethernet (EEE) technology is applied to an Ethernet network will be described.

  As a failure assumed to occur when the EEE technology is applied to an Ethernet network, packet loss and packet delay due to a delay in the time for the interface to transition from the sleep state to the recovery state can be considered. Although it is possible to detect the occurrence of packet loss and packet delay with respect to the failure as described above, for example, using the function of Ethernet OAM (Operation, Administration and Maintenance) (Non-Patent Documents 2 and 3). It is difficult to determine where in the network it is occurring. In addition, if the above-mentioned state occurs only rarely, there is a problem that it takes time for detection itself.

  Therefore, the present invention provides a network failure detection apparatus, method, and program for detecting the occurrence of a failure due to a delay in the time required for the interface of the EEE device to transition from the sleep state to the recovery state and estimating the failure occurrence point. The purpose is to do.

In order to achieve the above object, a failure detection device according to the present invention includes a first communication means for acquiring information from the communication device in a failure detection device for a network having a communication device having an EEE (Energy Efficient Ethernet) function; Second communication means for acquiring the connection relation of the network, network resource management database for holding the connection relation of the network acquired by the second communication means, and buffer overflow information in the buffer memory of the interface of the communication apparatus Is acquired by the first communication means, and based on the buffer overflow information, a failure analysis means for estimating the failure location and the cause is provided.

  Then, the failure analysis means identifies the opposite device of the interface that has been suspended by the EEE function from the connection relation of the network, and the buffer overflow information in the buffer memory of the interface of the opposite device is obtained by the first communication means. The failure location and the cause are estimated based on the buffer overflow information in the buffer memory of the interface that is acquired by the EEE function and the buffer overflow information in the buffer memory of the interface of the opposite device. .

  Further, the failure analysis means may be configured such that the failure is an interface caused by EEE based on the buffer overflow information in the buffer memory of the transmission side interface that is suspended by the EEE function and the buffer overflow information in the buffer memory of the reception side interface of the opposite device. It is also preferable to judge that the failure is due to control.

  The failure analysis means preferably obtains buffer overflow information in the buffer memory from the MIB information.

In order to achieve the above object, a failure detection method according to the present invention obtains buffer overflow information in a buffer memory of an interface of a communication device in a failure detection method for a network having a communication device having an EEE (Energy Efficient Ethernet) function. An interface that is paused by the EEE function and the interface that is paused by the EEE function is identified from the connection relationship of the network, the buffer overflow information in the buffer memory of the interface of the opposite device is obtained, and the interface that is paused by the EEE function And a failure analysis step for estimating the cause and cause of the failure based on the buffer overflow information in the buffer memory and the buffer overflow information in the buffer memory of the interface of the opposite device .

In order to achieve the above object, a program according to the present invention includes: a first communication unit that acquires information from a communication device, a computer that detects a failure of a network having a communication device having an EEE (Energy Efficient Ethernet) function; Second communication means for acquiring the connection relation of the network, network resource management database for holding the connection relation of the network acquired by the second communication means, and buffer overflow information in the buffer memory of the interface of the communication apparatus acquired by the first communication means, based on the buffer overflow information, Rutotomoni to function as a fault analysis means for estimating the failure part and causes the failure analyzing means, interface resting by the EEE feature Identifying the opposite device from the network connection relationship, The buffer overflow information in the buffer memory of the interface of the opposite device is acquired by the first communication means, and the buffer overflow information in the buffer memory of the interface that is suspended by the EEE function, and the buffer memory of the interface of the opposite device It is characterized by including a function of estimating a fault location and a cause based on buffer overflow information.

  According to the present invention, the location and cause of the failure can be determined for a failure caused by a delay in the time for the interface to transition from the sleep state to the recovery state, which is assumed to occur in the Ethernet switch to which the EEE function is applied. It becomes possible to estimate quickly.

1 shows an overview of an Ethernet network including a fault detection device according to the present invention. Each function of the fault detection apparatus according to the present invention will be described. The operation | movement flowchart of a failure detection apparatus is shown. The block diagram of the Ethernet network comprised by the Ethernet switch provided with the EEE function is shown.

  The best mode for carrying out the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an overview of an Ethernet network including a fault detection apparatus according to the present invention. The device according to the present invention detects a failure caused by a delay in the time for the interface of the EEE device to transition from the hibernation state to the recovery state in an Ethernet network including Ethernet switches having an EEE function. As shown in FIG. 1, the device of the present invention acquires information from each Ethernet switch via a management network.

  FIG. 2 shows each function of the failure detection apparatus according to the present invention. The failure detection apparatus 1 includes a communication function (1) 11, a communication function (2) 12, a network resource management database 13, and a failure analysis unit 14. The communication function (1) 11 has a function of communicating to acquire network information from the operation management system. The communication function (2) 12 has a function of communicating in order to acquire information from each Ethernet switch. The network resource management database 13 holds information on the network to be managed. The content of the information to be held is a network connection relationship constituted by Ethernet switches. The failure analysis unit 14 has a function of analyzing whether the cause of the failure is due to EEE based on information acquired from the Ethernet switch.

FIG. 3 shows an operation flowchart of the failure detection apparatus. The flow will be described below.
(S1) Start: Network connection relation information is obtained from the operation management system via the communication function (1) 11 in the network resource management database.
(S2) Is the interface paused due to EEE? : In the interface of the Ethernet switch, it is confirmed whether or not the interface is suspended by the operation of EEE.
-If not paused: Check the interface status repeatedly.
-If it is paused: Move to S3.
(S3) Confirming the buffer memory of the dormant interface: The state of the buffer memory of the dormant interface detected in the above step is confirmed.
(S4) Has a buffer overflow occurred? : Check whether buffer overflow has occurred in the state of the buffer memory confirmed in the above step.
If the buffer overflow has not occurred: Return to S2 again to check the interface status.
• When buffer overflow occurs: The process proceeds to confirming the occurrence location of S5.
(S5) Confirmation of occurrence location: It is confirmed whether the buffer overflow confirmed in the above step has occurred in the transmission side interface or in the reception side interface.
When a buffer overflow occurs at the transmission side interface: The process proceeds to S6 to confirm the buffer of the reception side interface of the opposite device.
When a buffer overflow occurs at the receiving side interface: The process proceeds to S10 for checking the buffer of the transmitting side interface of the opposite device.
(S6) Confirming the buffer of the reception side interface of the opposite device: Specifying the reception side interface of the opposite device to be confirmed using the network connection relation information obtained from the operation management system, and the buffer memory of the reception side interface of the opposite device Confirm.
(S7) Has a buffer overflow occurred? : Check whether buffer overflow has occurred in the buffer memory checked in the above step.
When the buffer overflow has occurred: The process proceeds to the identification (estimation) of the fault location and cause in S8.
If the buffer overflow has not occurred: the process proceeds to the identification (estimation) of the fault location and cause in S9.
(S8) Fault location and cause estimation: The fault that has occurred is estimated as a signal processing fault on the transmission side interface and the reception side interface.
(S9) Fault location and cause estimation: The fault that has occurred is determined to be a fault caused by interface control by EEE, and the fault location and cause are estimated as a startup delay of the transmission side interface.
(S10) Buffer confirmation of the transmission side interface of the opposite device: Using the network connection relation information obtained from the operation management system, the transmission side interface of the opposite device to be confirmed is specified, and the buffer memory of the transmission side interface of the opposite device is specified. Check.
(S11) Has a buffer overflow occurred? : Check whether buffer overflow has occurred in the buffer memory checked in the above step.
When the buffer overflow has occurred: The process proceeds to the identification (estimation) of the fault location and cause in S12.
If the buffer overflow has not occurred: the process proceeds to the identification (estimation) of the failure location and the cause in S13.
(S12) Fault location and cause estimation: The fault that has occurred is estimated as a signal processing fault in the transmission side interface and the reception side interface.
(S13) Estimation of fault location and cause: The fault that has occurred is estimated as a signal processing fault of the receiving interface.
(S14) End

  Next, examples of the present invention will be described. FIG. 4 shows a configuration diagram of an Ethernet network configured by an Ethernet switch having an EEE function. A network is configured by Ethernet switches A to I. The number given to each Ethernet switch indicates the interface number. Each Ethernet switch is connected to a failure detection device via a management network. The failure detection device confirms the state of each Ethernet switch via the management network. Also, MIB (Management Information Base: Non-Patent Document 5) information is acquired from each Ethernet switch by SNMP (Simple Network Management Protocol: Non-Patent Document 4).

  In this embodiment, it is assumed that the Ethernet link between D and E is in an interface dormant state by EEE. Here, a case will be described where a loss occurs due to a delay in the transition time from the interface sleep state to the recovery state due to EEE in the transmission side interface of the Ethernet switch D.

なお、表１でスイッチはイーサネットスイッチを表し、ＩＦはインタフェースを表す。
（Ｓ２）ＥＥＥによりインタフェースが休止しているか？：障害検出装置は、管理網を介して、各イーサネットスイッチのインタフェースにおいて、ＥＥＥが動作することで休止しているかどうかを確認する。ここでは、イーサネットスイッチＤのインタフェース２とイーサネットスイッチＥのインタフェース１がＥＥＥにより休止状態であることが、障害検出装置により確認される。
（Ｓ３）休止インタフェースのバッファメモリを確認：上述のステップで検出された休止インタフェースのバッファメモリの状態を確認する。バッファメモリの状態を確認する際、ＭＩＢ情報を用いる。
（Ｓ４）バッファあふれ発生？：上述のステップで確認したバッファメモリの状態において、バッファあふれが発生しているかどうかを確認する。本例では、バッファあふれの発生が確認されるため、次ステップの発生箇所の確認に移る。
（Ｓ５）発生箇所の確認：上述のステップで確認したバッファあふれが、送信側インタフェースで発生したか、受信側インタフェースで発生したかを確認する。本例では、イーサネットスイッチＤの送信側インタフェースでバッファあふれが発生したため、次ステップの対向装置の受信側インタフェースのバッファ確認に移る。
（Ｓ６）対向装置の受信側インタフェースのバッファ確認：ここで、運用管理システムから得たネットワーク接続関係情報を用いて、確認すべき対向装置の受信側インタフェースがイーサネットスイッチＥのインタフェース１と特定される。そこで、イーサネットスイッチＤの対向装置であるイーサネットスイッチＥのインタフェース１における受信側インタフェースのバッファメモリを確認する。
（Ｓ７）バッファあふれ発生？：上述のステップで確認したバッファメモリにおいてバッファあふれが発生していたか否かを確認する。本例では、バッファあふれが発生していなかったため、Ｓ９の障害箇所と原因の推定に移る。
（Ｓ９）障害箇所と原因の推定：発生した障害はＥＥＥによるインタフェース制御に起因する障害であると判断し、その障害箇所と原因としては、イーサネットスイッチＤの送信側のインタフェースの起動遅延と推定する。
（Ｓ１４）終了： Hereinafter, the operation will be described according to the operation flow of FIG.
(S1) Start: Obtain network connection information from the operation management system. In this example, the network connection relationship of each Ethernet switch interface as shown in Table 1 below is obtained.

In Table 1, a switch represents an Ethernet switch, and IF represents an interface.
(S2) Is the interface paused due to EEE? : The failure detection device checks whether or not the interface of each Ethernet switch is inactive by operating the EEE via the management network. Here, the failure detection device confirms that the interface 2 of the Ethernet switch D and the interface 1 of the Ethernet switch E are in a dormant state by EEE.
(S3) Confirming the buffer memory of the dormant interface: The state of the buffer memory of the dormant interface detected in the above step is confirmed. MIB information is used when checking the state of the buffer memory.
(S4) Has a buffer overflow occurred? : Check whether buffer overflow has occurred in the state of the buffer memory confirmed in the above step. In this example, since the occurrence of buffer overflow is confirmed, the process proceeds to confirming the location where the next step occurs.
(S5) Confirmation of occurrence location: It is confirmed whether the buffer overflow confirmed in the above step has occurred in the transmission side interface or in the reception side interface. In this example, since the buffer overflow has occurred in the transmission side interface of the Ethernet switch D, the process proceeds to the buffer confirmation of the reception side interface of the opposite device in the next step.
(S6) Confirming the buffer of the reception side interface of the opposite device: Here, the reception side interface of the opposite device to be confirmed is identified as the interface 1 of the Ethernet switch E using the network connection relation information obtained from the operation management system. . Therefore, the buffer memory of the receiving side interface in the interface 1 of the Ethernet switch E which is the opposite device of the Ethernet switch D is confirmed.
(S7) Has a buffer overflow occurred? : Check whether buffer overflow has occurred in the buffer memory checked in the above step. In this example, since no buffer overflow has occurred, the process proceeds to S9 to estimate the fault location and cause.
(S9) Estimation of failure location and cause: It is determined that the failure that has occurred is a failure caused by interface control by EEE, and the failure location and cause is estimated as the startup delay of the interface on the transmission side of the Ethernet switch D. .
(S14) End:

  Moreover, all the embodiments described above are illustrative of the present invention and are not intended to limit the present invention, and the present invention can be implemented in other various modifications and changes. Therefore, the scope of the present invention is defined only by the claims and their equivalents.

1 Failure detection device 11 Communication function (1)
12 Communication function (2)
13 Network Resource Management Database 14 Failure Analysis Department

Claims (5)

In a failure detection device for a network having a communication device having an EEE (Energy Efficient Ethernet) function,
First communication means for obtaining information from the communication device;
Second communication means for acquiring a connection relationship of the network;
A network resource management database that holds a network connection relationship acquired by the second communication means;
The buffer overflow information in the buffer memory of the interface of the communication device is acquired by the first communication means, and based on the buffer overflow information, a failure analysis means for estimating the fault location and the cause , and
The failure analysis means includes
Identifying the opposite device of the interface that is dormant by the EEE function from the connection relation of the network,
Obtaining buffer overflow information in the buffer memory of the interface of the opposite device by the first communication means;
The failure location and the cause are estimated based on the buffer overflow information in the buffer memory of the interface that is dormant by the EEE function and the buffer overflow information in the buffer memory of the interface of the opposite device. Failure detection device. The failure analysis means performs interface control by EEE based on buffer overflow information in the buffer memory of the transmission side interface that has been suspended by the EEE function and buffer overflow information in the buffer memory of the reception side interface of the opposite device. The failure detection apparatus according to claim 1 , wherein the failure detection device determines that the failure is caused by the failure. The failure detection apparatus according to claim 1 , wherein the failure analysis unit acquires buffer overflow information in a buffer memory from MIB information. In a failure detection method for a network having a communication device having an EEE (Energy Efficient Ethernet) function,
Obtaining buffer overflow information in a buffer memory of the interface of the communication device;
The opposite device of the interface that is dormant by the EEE function is identified from the connection relation of the network, the buffer overflow information in the buffer memory of the interface of the opposite device is acquired, and the buffer memory of the interface that is dormant by the EEE function A failure analysis step of estimating a failure location and a cause based on the buffer overflow information in the buffer device and the buffer overflow information in the buffer memory of the interface of the opposite device ;
Fault detection method, which comprises a. A computer that detects a failure in a network having a communication device equipped with an EEE (Energy Efficient Ethernet) function.
First communication means for obtaining information from the communication device;
Second communication means for acquiring a connection relationship of the network;
A network resource management database that holds a network connection relationship acquired by the second communication means;
The acquired by the buffer overflow information in the buffer memory of the interface of the communication device the first communication means, based on the buffer overflow information, to function as a fault analysis means for estimating the failure part and cause Rutotomoni,
The failure analysis means includes
Identifying the opposite device of the interface that is dormant by the EEE function from the connection relation of the network,
Obtaining buffer overflow information in the buffer memory of the interface of the opposite device by the first communication means;
A function of estimating a fault location and a cause based on buffer overflow information in the buffer memory of the interface that is dormant by the EEE function and buffer overflow information in the buffer memory of the interface of the opposite device; A program characterized by

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