KR20000033847A - Method of optimizing data collecting frequency with snmp - Google Patents

Abstract

PURPOSE: A method of optimizing data -collecting frequency with an SNMP(simple network management protocol) is provided to minimize the load of a network and to collect data efficiently by collecting SNMP data per proper frequency for the network. CONSTITUTION: A method of optimizing data -collecting frequency comprises the steps of: setting data -collecting frequency between a network management server and network equipment; producing new collecting frequency by calculating data flow rate during certain time; and performing the former step after resetting new collecting frequency. In the method, the set collecting frequency is produced by the interface speed between the network management server and the network equipment. Also, the new collecting frequency is calculated on the basis of the maximum data flow rate.

Description

Data collection cycle optimization method using SNP

The present invention relates to a data collection cycle optimization method using SNMP, and more particularly, to a method for optimizing the collection frequency when collecting data periodically using SNMP for the network equipment in the computer network management system.

In general, Simple Network Management Protocol (SNMP) is the most widely used protocol for computer network management, and information to be transmitted between the network manager and the device is predefined in MIB (Management Information Base). In computer network management using SNMP, computer equipment is managed by changing and checking the value of a specific variable using MIB. The meaning of MIB and the form of value obtained through MIB are defined in advance. MIBs can be defined as standardized, common to multiple devices, and uniquely defined by the manufacturer and used only in specific devices. The syntax of the values obtained through the MIB is defined in several ways. Among them, the values with increasing characteristics are defined as counters, and are reset to zero when the counter exceeds the maximum value. It is increasing again. Therefore, when collecting MIB data from the management system using SNMP, the collection cycle should be set in consideration of this. Generally, the data is collected by setting a fixed period. The problem with collecting data at fixed intervals is that collecting the data too often or too rarely without considering the counter's reset period causes problems such as lack of reliability of the collected data or overloading the network equipment.

Accordingly, the present invention devises a method for collecting SNMP data by flexibly setting a data collection cycle according to the network situation, and provides a method for efficiently collecting data while minimizing load on a computer network.

In order to achieve the above object, a method for optimizing a data collection cycle using SNMP for managing a network between a network management server and a plurality of computer network configuration equipment of the present invention includes (a) a data collection cycle between the computer network management server and the computer network configuration equipment. (B) calculating a new collection period by calculating the data flow amount for a predetermined time after setting the collection period, and (c) executing the step (b) after resetting the new collection period. It is equipped with a step.

1 is a general computer network management method using SNMP data collection.

2 is a flow chart illustrating a method of minimizing an SNMP data collection cycle. .

<Explanation of symbols for the main parts of the drawings>

1. Computer Management Server 2. Computer Network Equipment

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 is a diagram illustrating a general method of managing a computer network using SNMP. When the SNMP query is sent to the computer network device 2 that is managed by the computer network management server 1, the management device responds. If the syntax of the value to be queried is a counter, the query / response must be continuously executed to continuously observe the change of the network status. The measured value is not used as an absolute value but the difference from the value measured at the previous time is used. For example, the difference between the value measured at time T and the value measured at T-d time is used as a meaningful value in managing the computer network, as shown in the following equation (1).

Result (K, T) = poll (K, T)-poll (K, T-d) --- Equation 1

K: preset with MIB object ID

T: time

d: measuring interval

poll (): the value SNMP responds to

When using (Equation 1), the value of Result (K, T) is often shown as a negative number.If the value exceeds the maximum value, it is automatically reset and restarted from 0.In this case, Result ( The value of K, T) shall be calculated as follows, taking into account the maximum value of the counter.

Result (K, T) = poll (K, T) + (counter maximum)-poll (K, T-d) --- Equation 2

K: MIB object ID

T: time

d: measuring interval

poll (): the value SNMP responds to

If the counter is reset n times during the measurement interval d, the above equation is equivalent to 'Result (K, T) = poll (K, T) + (counter maximum) * n-poll (K, Td)' Should change together. In some cases, the value of n may not be predicted due to a long measurement interval, so that the measurement period may be set so that n is 1, that is, only when the counter is reset once to obtain reliable data.

When using SNMP to calculate the network device interface usage, the syntax of the value that stores the input / output amount of data is a 32-bit counter, so for the 45-Mbps interface, the counter is not reset for 12 minutes, while the 1.544-Mbps speed is used. In case of interface of 370 minutes is maintained. The calculation formula to calculate this is as shown in (3) below, and the speed of the interface is the main factor that determines the data collection period. It is assumed that the computer runs for an indefinite period of time, so the reset of the counter due to the machine restart is not considered.

x <= (2 ³² -1) * 8 / Interface speed (bps) --- Equation 3

In the above formula, the range of x value is the range of values that can be set as the collection period. In general, setting the maximum value that x can have as the collection period can prevent the counter from being reset more than once in the collection period. Wherein 2 ³² -1 relates to the data throughput at the interface. 8 is a representation of the interface speed in bits, so it may not be necessary if the interface speed is in a representation other than bits.

However, the above calculation takes into account the amount of data that can be distributed by the corresponding interface, which is not preferable when the actual network utilization is low compared to the speed of the interface.

Therefore, in the present invention, instead of the speed of the interface, the amount of data circulated in the actual computer network is used as the denominator of the above equation, and Equation 4 is a calculation equation for this.

x <= (2 ³² -1) * 8 / Actual data flow rate (bps) --- Equation 4

In the initial setting (21) of the computer network management system, the equation (3) is used in consideration of the speed of the interface, and after the data is collected during the day, the value of the peak hourly circulation in bps is input (Equation 4). Use 22 and set the data collection period to this new value (23). As with equation (3), ^232-1 is concerned with the data throughput of the interface. 8 is an expression that appears because the actual data circulation amount is expressed in bits, and thus may not be necessary when the actual data distribution amount is expressed in other than bits.

Therefore, the busiest hourly circulation volume for the previous 24 hours was calculated once a day to change the parameters to be put in Equation 4 to cope with the increase in network usage. The procedure for this is shown in FIG. 2. However, when calculating the data flow rate, it is also possible to shorten or extend the time to 24 hours instead of setting it to 24 hours as in the above case, which is determined by the environment of the computer system.

However, in the embodiment of the present invention, since the data circulating in the actual computer network increases and decreases in a similar form every day, and the daily data usage is similar but gradually increases, the data collection cycle is determined once a day using the same. How to do it.

The above-described method of the present invention can be applied even when the amount of data circulated on the interface is not.

For example, when observing the network status using the number of input / output data packets, the number of Unicast / NonUnicast packets, etc., these values are not directly related to the speed of the interface but are longer than the network usage due to the characteristics of the values. Since it is possible to collect using a period, the initial value is set (21) by applying (3). After data is collected for one day, the number of packets distributed in the busiest times (Packet / second) is used (Equation 5), which is applied to the denominator (22), and the data collection cycle is set to this new value. Here too, once a day, the busiest hourly change amount for the previous 24 hours was calculated and put into (Eq. 5) to change the parameters daily so as to cope with the increase in network usage.

x <= (2 ³² -1) / number of packets distributed in the busy hour (Packet / sec) --- Equation 5)

As can be seen in the embodiment of the present invention, by the collection cycle determination method of the present invention, the load on the computer network management server and network equipment due to the periodic data collection in the network management system is reduced, based on the interface speed The collection cycle can be determined more efficiently than the conventional case of determining the collection cycle.

As can be seen from the above, in relation to computer network management using SNMP, when collecting data using SNMP, the collection cycle is set excessively, so that the maximum amount of load on the computer network and equipment is reduced. It is possible to efficiently manage the network by determining the appropriate data collection cycle by applying the data network usage patterns by the actual data distribution amount or the number of packets distributed for 24 hours or a certain time.

The present invention described above has been disclosed for purposes of illustration, and those skilled in the art to which the present invention pertains may make various modifications, changes, additions, and the like possible within the spirit and scope of the present invention. Such modifications, changes, and additions are within the scope of the present invention. It should be determined that it belongs to the claims described below.

Claims (4)

In the data collection cycle optimization method using SNMP for computer network management between the network management server and a plurality of computer network equipment, (a) setting a data collection cycle between the computer network management server and the computer network equipment; (b) calculating a new collection cycle by calculating the data flow rate for a predetermined time after setting the collection cycle; and (c) executing the step (b) after resetting the new collection period. The method of claim 1, The collection period is set in step (a) is the data collection cycle optimization method using SNMP, characterized in that set by the interface speed between the computer network management equipment and the network component equipment. The method of claim 1, And the new collection period determined in step (b) is calculated on the basis of the maximum amount of data circulation. The method of claim 1, And the new collection period determined in step (b) is calculated based on the maximum number of packets of the data being distributed.