DFM Polling and reporting

Unanswered Question

I have a question regarding DFM and how/what it polls when looking at utilization and up/down.


How does DFM calculate over utilization? what is it looking at? how accurate and timely is the information?


with up/down, is it simply the polling that will tell me that a device is down? A syslog message that tells me it is backup?


thanks

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David Stanford Tue, 04/15/2008 - 10:28
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Are you asking about interface utilization or CPU/Memory?


We poll different MIB objects to get this data, and as soon as you let me know what you want specifically I can let you know.

David Stanford Tue, 04/15/2008 - 10:48
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High Utilization


event definition:

CurrentUtilization > UtilizationThreshold;


CurrentUtilization =

((TrafficRate * 8) / MaxSpeed * 100;


TrafficRate =

= ifInOctetsRate + ifOutOctetsRate; if DuplexMode is HALFDUPLEX

= max(ifInOctetsRate, ifOutOctetsRate) if DuplexMode is FULLDUPLEX


ifInOctetsRate =

= rate(ifInOctets, PollingInterval);

ifOutOctetsRate =

= rate(ifOutOctets, PollingInterval);


UtilizationThreshold = 40


simulation:


ifInOctets 1.3.6.1.2.1.2.2.1.10

ifOutOctets 1.3.6.1.2.1.2.2.1.16

or High capacity counter (not supported by all OS versions)

ifHCInOctets 1.3.6.1.2.1.31.1.1.1.6

ifHCOutOctets 1.3.6.1.2.1.31.1.1.1.10


To simulate high utilization, use the following value:

MaxSpeed/8 * 0.5


You can find MaxSpeed from Interface/Port property sheet.


The counters will wrap after sometime. Please make sure the rate

calculation is right when counters wrap.


expected: PerformanceException

-- HighUtilization


David Stanford Tue, 04/15/2008 - 10:49
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The time depends on our polling intervals configured in DFM (pollings and thresholds configuration)

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