Installation Manual

IBRInstallationGuide
 Page19of40 Doc#770‐00001‐13
 Sept.21,2014
IBRautomaticallyrecordstheMACaddressofareceivedpacket,theportonwhichitwasreceived,and
whetherthepackethasaVLANdesignation.WhenanincomingpacketarrivesatIBR,thecorrectportand
VLANfordeliveryofthepacketisdeterminedbycomparingtheMACaddressofthepacketwiththe
correspondingentryinL2.IftheMACaddressisnotintheL2table,IBRwillsendthepacketouttoallports
excepttheoneonwhichitwasreceived,andthenrecordtheportandVLANofthedevicethatrespondstothe
packet.
WhenaMACaddressintheL2tablehasnotbeenusedwithinapresettime(the“agingtime”),theMAC
addressentryisautomaticallydeletedfromthetable.Thedefaultagingtimeisthreehundred(300)seconds.
AgingtimeistheonlypropertyoftheL2tablefunctionalitythatcanbechanged.TheL2tablecancontainup
tosixty‐fourthousandentriessothat,withareasonableagingtime,thereislittlechanceofanoverflow
condition.
UsingtheCLI“show”command,anoperatorcandisplaythecontentsoftheL2table.
5.2 Counters
Countersareimplementedastwo‐dimensionalarraysthatassociatetrafficmetricswiththecorresponding
IBRports(interfaces).Countersareactivatedbydefaultandcannotbedisabled;however,thecontentsof
counterscanberesettozeroordisplayedbyoperatorcommand.ThecountersinIBRarelistedbelow
organizedthewaytheywouldbedisplayedusingtheshowcommand.
IBR102#showinterfacecounters Showsabriefview,notincludingerrors
IBR102#showinterfacecountersall ShowsallexceptTxQueue
IBR102#showinterfacecountersdetail Showsthefollowingcounters
InBytes Bytesreceivedataport
InUcastPkts Unicastpacketsreceivedataport
InMcastPkts Multicastpacketsreceivedataport
InBcastPkts Broadcastpacketsreceivedataport
OutBytes Bytessentfromaport
OutUcastPkts Unicastpacketssentfromaport
OutMcastPkts Multicastpacketssentfromaport
OutBcastPkts Broadcastpacketssentfromaport
RxPause Pauserequestsreceived
TxPause Pauserequestssent
IBR102#showinterfacecounterserrors Showserrorcounters
CrcAlign‐Err Frameswithoutaneven#ofoctetsorwithCRCerrors
Collisions Collisionsbeforesuccessfultransmission
Symbol‐Err Symbolerrors
Undersize Framesrcvdthatare<64bytes
Oversize Framesrcvdthatare>1514bytes
Fragments Oversizedpacketssentasfragments
Jabbers Frameslongerthan1518octets
FCS‐Err Framescorruptedduringtransmission
Deferred‐Xmit Timesxmsndelayed
Single‐Col Timesonlyonecollisionoccurredbeforesuccessfulxmsn
Multi‐Col Timesmultiplecollisionsoccurredbeforesuccessfulxmsn
Late‐Col Collisionsdetectedafter>512bitssent
Excess‐Col Framesnotsentduetoexcess#ofretries
IBR102#showinterfacecounterstxqueueShowsTxQueuecounters
Octets TXqueueoctets