Specifications

How Can I Implement NetFlow?
May 18, 2011 Page 2 of 21
rescheduledforlowusagetimeblocks,ormaybeanillegitimateusageofthenetworkthatcan
beaddressedbyspeakingtotheuser.
•Canlookintotheflowsthattransitthenetworklinks,providingameansofverifyingwhether
QoSandpolicyconfigurationsareappropriatelyconfiguredforyournetwork.
•Canunderstand
yournetwork’sflowcharacteristics, allowingforbetterplanningwhen
transitioningtonewapplicationsorservices.
How Can I Implement NetFlow?
Havingaprofileofcapturedflowsthattransityournetworkovertimeisacrucialfirststepin
implementingasecurenetwork.ThisNetFlowprofileprovidesyouwithagoodunderstandingof
theactualgroupandindividualbehaviorsthatmakeuptherolesyousetbypolicyandtowhich
you
applyQoS.Aprofilecanalsobeveryhelpful duringnetworkplanningexercises,suchas
projectinghowanetworkmightreacttotheintroductionofanewapplicationpriortoactual
implementation.Figure 1illustratesanexampleofaNetFlownetworkprofilesetup.