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snmp bandwidth event monitor Description 
The SNMP Bandwidth event monitor uses the Simple Network Management Protocol
(SNMP) to connect to remote devices and check the amount of incoming and
outgoing bandwidth on each of the device's interfaces.
Many routers and switches support SNMP and this event monitor can be used to monitor their usage. It is particularly useful for monitoring your router(s) that connect to the Internet and warning if bandwidth usage exceeds specified values. Specify values for the Community parameter, sample time, time out and number of retries, or accept the defaults. The default community value for many devices is 'public' however it may have been changed to another value for security purposes. See the device documentation or contact the administrator of the device for details. You can use the Test button to check the values while you are configuring the event monitor. You can also select to filter the interfaces that will be checked. Most routers and switches have many interfaces including multiple internal interfaces and one or more external interfaces. With the filter option you can choose to monitor just the interfaces that need to be monitored. Using SNMP with Windows table of contents Windows has built-in support for SNMP however it is not enabled by default. To enable, go to the Add/Remove Programs section of the Control. Select the Add/Remove Windows Components option on the left. In the list that appears, select the Management and Monitoring Tools option and then press the Details button. In the dialog that appears you'll see an option to install support for Simple Network Management Protocol (SNMP). When using SNMP on Windows, you should now that all SNMP counters are only updated by the operating system on a periodic basis, somewhere between 5 and 30 seconds. This can cause confusing results with SNMP Bandwidth event monitor. For example, if there is steady rate of 50K/sec of bandwidth on a monitored machine but the sample time for this event monitor is less than 30 seconds reported bandwidth will vary between zero and a value higher than 50K/sec. This is because the event monitor takes two samples of the total bytes sent and received. If the samples are taken during a period when Windows has not updated its SNMP values, both samples are the same indicating zero bandwidth. To workaround this, set your sample time to 30 seconds or longer. As far as we are aware, Windows is the only operating system that has such a long delay between SNMP value updates. Other operating systems, especially on routers and switches, tend to update the SNMP values continuously. |
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