19/12/2014 Standard Break Key Sequence Combinations During Password Recovery - Cisco

http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/12818-61.html?mdfid=274382157 1/3

Cisco10000SeriesRouters

StandardBreakKeySequenceCombinationsDuringPasswordRecovery

Contents

IntroductionPrerequisites

RequirementsComponentsUsedConventions

StandardBreakKeyCombinationsTipstoTroubleshootHowtoSimulateaBreakKeySequenceRelatedInformationRelatedCiscoSupportCommunityDiscussions

IntroductionThisdocumentprovidesstandardbreakkeysequencecombinationsforthemostcommonoperatingsystems,andsometipsonhowtotroubleshootproblems.

TheElectronicIndustriesAssociation RS232logicleveluses+3to+25voltstosignifyaSpace(Logic0)and3to25voltsforaMark(logic1).Abreaksignaliswhenthedatalineremainsinthespaceconditionforaspecifiedduration,usually100mstosecond.Allcharactersbeginwithastartbitandendwithastopbit(andalsoaparitybitortwo).Thelevelconditionofthestartandstopbitsisalwaysopposite.So,nocharactercombinationcanlooklikethebreaksignal.AbreaksignalenablesyoutoaccessaROMMonitoronCiscoIOSdeviceswhenapasswordrecoveryisnecessary.

Prerequisites

Requirements

Therearenospecificrequirementsforthisdocument.

ComponentsUsed

Thisdocumentisnotrestrictedtospecificsoftwareandhardwareversions.

Theinformationinthisdocumentwascreatedfromthedevicesinaspecificlabenvironment.Allofthedevicesusedinthisdocumentstartedwithacleared(default)configuration.Ifyournetworkislive,makesurethatyouunderstandthepotentialimpactofanycommand.

Conventions

RefertoCiscoTechnicalTipsConventionsformoreinformationondocumentconventions.

StandardBreakKeyCombinations

Software Platform OperatingSystem TryThis

HyperterminalIBMCompatible

WindowsXP CtrlBreak

Hyperterminal IBMCompatibleWindows2000 CtrlBreak

Hyperterminal IBMCompatibleWindows98 CtrlBreak

Hyperterminal(version595160)

IBMCompatible

Windows95 CtrlF6Break

Kermit SunWorkstation UNIXCtrl\l

Ctrl\b

MicroPhonePro IBMCompatible Windows CtrlBreak

Minicom IBMCompatible Linux Ctrlaf

ProCommPlus IBMCompatibleDOSorWindows Altb

SecureCRT IBMCompatible Windows CtrlBreak

Telix IBMCompatible DOS CtrlEnd

Ctrl],thentype

HOMESUPPORTPRODUCTSUPPORTENDOFSALEANDENDOFLIFEPRODUCTSCISCO10000SERIESROUTERSTROUBLESHOOTANDALERTSTROUBLESHOOTINGTECHNOTES

StandardBreakKeySequenceCombinationsDuringPasswordRecovery

19/12/2014 Standard Break Key Sequence Combinations During Password Recovery - Cisco

http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/12818-61.html?mdfid=274382157 2/3

Telnet N/A N/A sendbrk

TelnettoCisco IBMCompatible N/A Ctrl]

Teraterm IBMCompatible Windows Altb

Terminal IBMCompatible WindowsBreak

CtrlBreak

Tip SunWorkstation UNIXCtrl],thenBreakorCtrlc

~#

VT100Emulation

DataGeneral N/A F16

WindowsNT IBMCompatible Windows

BreakF5

ShiftF5

Shift6Shift4Shiftb(^$B)

ZTERMINAL Mac Apple Commandb

N/A

BreakOutBox N/A

Connectpin2(Xmit)to+Vforhalfasecond

Ciscotoauxport N/A

ControlShft6,thenb

IBMCompatible N/A CtrlBreak

TipstoTroubleshootProblemsthatyouencounterduringpasswordrecoveryoftenoccurbecauseyouarenotsureaboutwhatthebreakkeysequenceisforthe(nonCisco)softwareyouuse.Forsoftwarenotlistedinthetable,andforadditionalinformation,refertothedocumentationoftheindividualsoftwarepackages.

Theauxiliary(AUX)portisnotactiveduringthebootsequenceofarouter.Therefore,itisnouseifyousendabreakthroughtheAUXport.Youneedtohaveconnectiontotheconsoleport,andhavethesesettings:

9600baudrate

Noparity

8databits

1stopbit

Noflowcontrol

SomeversionsofWindowsNThavehyperterminalsoftwarethatcannotsendthecorrectbreakkeysignal.Refertohttp://www.hilgraeve.com/hyperterminal.html formoreinformationandforanupgradeofthehyperterminalsoftware.

Insomecases,thebreaksequencemightnotgettransmittedproperlywhenusingaUSB/Serialconvertercable.Insuchcases,useakeyboardwithadifferentconnectorport(forexample,aPS/2).

HowtoSimulateaBreakKeySequenceBreakkeysequencesimulationisusefulifyourterminalemulatordoesnotsupportthebreakkey,orifabugdoesnotallowyourterminalemulatortosendthecorrectsignal.

Note:ThehyperterminalunderWindowsNThadthisbehaviorinthepast.

Completethesestepstosimulateabreakkeysequence:

1. Connecttotherouterwiththeseterminalsettings:

1200baudrate

Noparity

8databits

1stopbit

Noflowcontrol

Younolongerseeanyoutputonyourscreen,andthisisnormal.

2. Powercycle(switchoffandthenon)therouterandpresstheSPACEBARfor1015secondsinordertogenerateasignalsimilartothebreaksequence.

3. Disconnectyourterminal,andreconnectwitha9600baudrate.YouentertheROMMonitormode.

Ifallthesemethodsfailtoproperlysendabreak,retrytheproceduresfromadifferentterminalorPCplatform.

RelatedInformation

19/12/2014 Standard Break Key Sequence Combinations During Password Recovery - Cisco

http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/12818-61.html?mdfid=274382157 3/3

Updated:Aug02,2006 DocumentID:12818

PasswordRecoveryProceduresTechnicalSupport&DocumentationCiscoSystems

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RefertoCiscoTechnicalTipsConventionsforinformationonconventionsusedinthisdocument.

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