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New Member

DFM Polling and reporting

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

4 REPLIES
Cisco Employee

Re: DFM Polling and reporting

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.

New Member

Re: DFM Polling and reporting

Interface utilization. I am wondering how accurate this info is and what interface value is being monitored? 5min, 30 second???

Cisco Employee

Re: DFM Polling and reporting

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

Cisco Employee

Re: DFM Polling and reporting

The time depends on our polling intervals configured in DFM (pollings and thresholds configuration)

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