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Setting Port Link Traps and Link Flap Detection

SecureStack C2 Configuration Guide 7-21

Setting Port Link Traps and Link Flap Detection

Purpose

Todisableorre‐enablelinktraps,displaylinktrapstatus,andtoconfigurethelinkflapping

detectionfunction.Bydefault,allportsareenabledtosendSNMPtrapmessagesindi cating

changestotheirlinkstatus(upordown).

Thelinkflapfunctiondetect swhenalinkisgoingupand

downrapidly(alsocalled“link

flapping”)onaphysicalport,andtakestherequiredactions(disableport,andeventuallysend

notificationtrap)tostopsuchacondition.If leftunresolved,the“linkflapping”conditioncanbe

detrimentaltonetworkstabilitybecauseitcantriggerSpanningTreeandroutingtable

recalculation.

Commands

show port trap

UsethiscommandtodisplaywhethertheportisenabledforgeneratinganSNMPtrapmessageif

itslinkstatechanges.

Syntax

show port trap [port-string]

Parameters

For information about... Refer to page...

show port trap 7-21

set port trap 7-22

show linkflap 7-22

set linkflap globalstate 7-25

set linkflap portstate 7-25

set linkflap interval 7-26

set linkflap action 7-26

clear linkflap action 7-27

set linkflap threshold 7-27

set linkflap downtime 7-28

clear linkflap down 7-28

clear linkflap 7-29

port‐string (Optional)Displayslinktrapstatusforspecificport(s).Foradetailed

descriptionofpossibleport‐stringvalues,referto“PortStringSyntaxUsed

intheCLI”onpage7‐2.

Enterasys SecureStack C2 C2G170-24 User Manual

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