216• Inactive flow aging—A flow is inactive if no packet arrives for this NetStream entry within theperiod specified by using the ip netstream timeout inactive command. When the inactive flowaging timer expires, the following situations occur:{ The inactive flow entry is aged out.{ The statistics of the flow are sent to NetStream servers. The statistics can no longer be displayedby using the display ip netstream cache command.When you use the inactive flow aging method, the cache is large enough for new flow entries.• Active flow aging—A flow is active if packets arrive for the NetStream entry within the periodspecified by using the ip netstream timeout active command. When the active flow aging timerexpires, the statistics of the active flow are exported to NetStream servers. The device continues tocollect active flow statistics, which can be displayed by using the display ip netstream cachecommand. The active flow aging method periodically exports the statistics of active flows toNetStream servers.Forced agingTo implement forced aging, use one of the following commands:• Use the reset ip netstream statistics command. This command ages out all NetStream entries, andexports and clears the statistics.• Use the ip netstream max-entry command. This command provides the following processingoptions when the upper limit is reached:{ Age out the entries.{ Disable creation of a new entry in the cache.TCP FIN- and RST-triggered agingTCP FIN- and RST-triggered aging is automatically performed when a TCP connection is terminated.A TCP connection is terminated when a packet with a FIN or RST flag is received.When a packet with a FIN or RST flag is recorded for a flow with an existing NetStream entry, the entryis immediately aged out, exported, and cleared.However, when the first packet of a flow has a FIN or RST flag, a new NetStream entry is created insteadof being aged out. This type of aging is always enabled, and it cannot be disabled.Configuration procedureTo configure flow aging:Step Command Remarks1. Enter system view. system-view N/A2. (Optional.) Configureperiodical aging.• Set the aging timer for active flows:ip netstream timeout active minutes• Set the aging timer for inactive flows:ip netstream timeout inactive secondsBy default:• The aging timer for activeflows is 30 minutes.• The aging timer forinactive flows is 30seconds.
