Specifications

Configuring NetFlow on the Enterasys S-Series, N-Series, and K-Series Modules
May 18, 2011 Page 7 of 21
Configuring the Active Flow Export Timer
Theactiveflowexporttimer,alsoreferredtoastheexportinterval,setsthemaximumamountof
timeanactiveflowwillbeallowedtocontinuebeforeexpirationforthissystem.Shouldtheactive
timerexpireandtheflowterminate,theunderlyingflowcontinuesasaseparateflow.Itisthe

responsibilityofthemanagementapplicationtorecognizethemultipleflowsasasinglelogical
flowforanalysisandreportingpurposes.Theactiveflowexporttimerdefaultsto30minutes.
Usethesetnetflowexport‐intervalcommandtochangetheactiveflowexporttimervaluefor
eachsystem.
Usetheclearnetflow
export‐intervalcommandtoresettheactiveflowexporttimertoitsdefault
value.
Configuring the NetFlow Collector IP Address
ExpiredNetFlowrecordsarebundledintoNetFlowexportpacketsandsenttotheNetFlow
collectorusingtheUDPprotocol.ConfiguringtheIPaddressoftheNetFlowcollectordest ination
determineswhereexpiredNetFlowrecordsforthissystemaresent.UptofourNetFlowcollectors
maybeconfiguredforeachsystem.Multiplesystems
maybeconfiguredforoneormoreNetFlow
collectors.YoucanoptionallyspecifytheUDPporttobeusedontheNetFlowcollector.By
default,noNetFlowcollectorisconfiguredonasystem.
Ifyouattempttoenterfivecollectordestinations,thefollowingerrordisplays:
Set failed. If previously configured, you must "clear netflow export-destination"
first.
Thismessageindicatesthatyouhaveconfiguredthemaximumnumberofexportdestinations for
thedevice.Removeaconfiguredexportdestinationusingtheclearnetflowexport‐destination
ip‐addresscommandbeforeaddinganadditionalexportdestination.
Usethesetnetflowexport‐destinationcommandtoconfiguretheIPaddressofaNetFlow

collectorforthissystemandoptionallysettheUDPport.
Usetheclearnetflowexport‐destinationcommandtoclearthespecifiedNetFlowcollector
configuration.
Configuring the NetFlow Export Version
TheEnterasysS‐Series,N‐Series,andK‐SeriesplatformssupportNetFlowexportversions5and9.
Thedefaultexportversionis5.
Theprimarydifferencebetweenthetwoversionsisthatversion5isafixeddatarecordwithout
multicastsupport,whereversion9isaflexible,extensible,template‐based
datarecordthat
providesthecompleteifIndexvalueand64‐bitcounters.
WithNetFlowversion5,packetsaremadeupofaseriesofdatarecordsandareexportedtothe
collectionserverwhenthemaximumnumberofNetFlowrecordsisreached.
Notes: Some NetFlow management applications expect to see export packets prior to some set
interval that is often as low as 1 minute. Check the documentation for your management
application and make sure that the export interval is configured for a value that does not exceed
that value.