Cisco Router Configuration Tutorial

Contents

1. What's covered2. Getting started3. Cisco RouterConfiguration3.1 Global configuration3.2 Configuring interfaces3.3 Routing3.4 IPv6 configurationwith IOS3.5 Saving yourconfiguration3.6 Example configuration4. Troubleshooting5. References6. More information

This work is licensedunder a CreativeCommons License.

PDF versionnow available.

Cisco Router ConfigurationTutorialJosh Gentry, jgentry@swcp.comv.1.4, 14 May, 2011

This document covers basic Cisco router IP configuration using thecommand-line interface

AcknowledgmentsThe following sources where extremely useful:

Leinwand, Pinsky, and Culpepper. Cisco Router Configuration.Indianapolis, Indiana: Cisco Press, 1998.Cisco Systems, Inc., http://www.cisco.com

DisclaimerThis document carries no explicit or implied warranty. Nor is there anyguarantee that the information contained in this document is accurate. It isoffered in the hopes of helping others, but you use it at your own risk. Theauthor will not be liable for any damages that occur as a result of using thisdocument.

ConventionsImportant terms and concepts, when they are introduced, may be displayed inbold. Commands included in the body of the text will be displayed in this

font. All names and addresses used in examples are just that, examples, andshould not be used on your network. Do not type them in verbatim whenconfiguring your system. Finally, in some examples where the commandrquires an IP address as an argument, the IP address may be represented inthis way, xx.xx.xx.xx, or aa.bb.cc.dd. You will never actually use these stringswhen configuring your system. They are mearly a convention of thisdocument to specify that you should substitute the appropriate IP address atthat point.

Cisco Configuration tool

Free Configuration Management toolfor Cisco Routers Switches Firewall

ManageEngine.com/DeviceExpert

Cisco Router Configuration Tutorial http://pages.swcp.com/~jgentry/topo/cisco.htm

1 of 60 10-12-2012 17:03

1. What this documentcovers

There are several methods available forconfiguring Cisco routers. It can bedone over the network from a TFTPserver. It can be done through themenu interface provided at bootup, andit can be done from the menu interfaceprovided by using the command setup.This tutorial does not cover thesemethods. It covers configuration fromthe IOS command-line interface only.Useful for anyone new to Ciscorouters, and those studying for CCNA.

Note that this tutorial does not coverphysically connecting the router to thenetworks it will be routing for. Itcovers operating system configurationonly.

1.1 Reasons for using thecommand-line

The main reason for using thecommand-line interface instead of amenu driven interface is speed. Onceyou have invested the time to learn thecommand-line commands, you canperform many operations much morequickly than by using a menu. This isbasically true of all command-line vs.menu interfaces. What makes itespecially efficient to learn thecommand-line interface of the CiscoIOS is that it is standard across allCisco routers. Also, some questions onthe CCNA exam require you to knowcommand-line commands.

2. Getting started withCisco

Initially you will probably configureyour router from a terminal. If therouter is already configured and atleast one port is configured with an IPaddress, and it has a physicalconnection to the network, you mightbe able to telnet to the router andconfigure it across the network. If it isnot already configured, then you willhave to directly connect to it with a

2 of 60 10-12-2012 17:03

terminalandaserialcable.WithanyWindowsboxyoucanuseHyperterminaltoeasilyconnecttotherouter.Plugaserialcableintoaserial(COM)portonthePCandtheotherendintotheconsoleportontheCiscorouter.StartHyperterminal,tellitwhichCOMporttouseandclickOK.Setthespeed

3 of 60 10-12-2012 17:03

oftheconnectionto9600baud

andclickOK.Iftherouterisnoton,turniton.

IfyouwishtoconfiguretherouterfromaLinuxbox,eitherSeyonorMinicomshouldwork.Atleastoneofthem,andmaybeboth,willcomewithyourLinuxdistribution.

OftenyouwillneedtohittheEnter

4 of 60 10-12-2012 17:03

keytoseethepromptfromtherouter.Ifitisunconfigureditwilllooklikethis:

Router>

Ifithasbeenpreviouslyconfiguredwithahostname,itwilllooklikethis:

hostnameofrouter>

Ifyouhavejustturnedontherouter,afteritbootsitwillaskyouifyouwishtobegininitial

5 of 60 10-12-2012 17:03

configuration.Sayno.Ifyousayyes,itwillputyouinthemenuinterface.Sayno.

2.1Modes

TheCiscoIOScommand-lineinterfaceisorganizedaroundtheideaofmodes.Youmoveinandoutofseveraldifferentmodeswhileconfiguringarouter,andwhichmodeyouareindetermineswhatcommandsyoucanuse.

6 of 60 10-12-2012 17:03

Eachmodehasasetofcommandsavailableinthatmode,andsomeofthesecommandsareonlyavailableinthatmode.Inanymode,typingaquestionmarkwilldisplayalistofthecommandsavailableinthatmode.

Router>?

2.2Unprivilegedandprivilegedmodes

Whenyoufirstconnecttotherouterandprovide

7 of 60 10-12-2012 17:03

thepassword(ifnecessary),youenterEXECmode,thefirstmodeinwhichyoucanissuecommandsfromthecommand-line.Fromhereyoucanusesuchunprivilegedcommandsasping,telnet,and

rlogin.

Youcanalsousesomeoftheshow

commandstoobtaininformationaboutthesystem.Inunprivilegedmodeyouusecommandslike,show

version

todisplay

8 of 60 10-12-2012 17:03

theversionoftheIOStherouterisrunning.Typingshow

willdiplayalltheshow

commandsavailableinthemodeyouarepresentlyin.

Router>show?

Youmustenterprivilegedmodetoconfiguretherouter.Youdothisbyusingthecommandenable.Privilegedmodewillusuallybepasswordprotectedunlesstherouterisunconfigured.

9 of 60 10-12-2012 17:03

Youhavetheoptionofnotpasswordprotectingprivilegedmode,butitisHIGHLYrecommendedthatyoudo.Whenyouissuethecommandenable

andprovidethepassword,youwillenterprivilegedmode.

Tohelptheuserkeeptrackofwhatmodetheyarein,thecommand-linepromptchangeseachtimeyouenteradifferentmode.When

10 of 60 10-12-2012 17:03

youswitchfromunprivilegedmodetoprivilegedmode,thepromptchangesfrom:

Router>

Router#

Thiswouldprobablynotbeabigdealiftherewerejusttwomodes.Thereare,infact,numerousmodes,andthisfeatureisprobablyindispensable.Paycloseattentiontothepromptatalltimes.

Withinprivilegedmodethere

11 of 60 10-12-2012 17:03

aremanysub-modes.InthisdocumentIdonotcloselyfollowCiscoterminologyforthishierarchyofmodes.Ithinkthatmyexplanationisclearer,frankly.Ciscodescribestwomodes,unprivilegedandprivileged,andthenahierarchyofcommandsusedinprivilegedmode.Ireasonthatitismuchclearertounderstandifyoujustconsiderthereto

12 of 60 10-12-2012 17:03

bemanysub-modesofprivilegedmode,whichIwillalsocallparentmode.Onceyouenterprivilegedmode(parentmode)thepromptendswithapoundsign(#).Therearenumerousmodesyoucanenteronlyafterenteringprivilegedmode.Eachofthesemodeshasapromptoftheform:

Router(arguments)#

Theystillallendwith

13 of 60 10-12-2012 17:03

thepoundsign.Theyaresubsumedwithinprivilegedmode.Manyofthesemodeshavesub-modesoftheirown.Onceyouenterpriligedmode,youhaveaccesstoalltheconfigurationinformationandoptionstheIOSprovides,eitherdirectlyfromtheparentmode,orfromoneofitssubmodes.

3.ConfiguringyourCiscoRouter

14 of 60 10-12-2012 17:03

Ifyouhavejustturnedontherouter,itwillbecompletelyunconfigured.Ifitisalreadyconfigured,youmaywanttoviewitscurrentconfiguration.Evenifithasnotbeenpreviouslyconfigured,youshouldfamiliarizeyourselfwiththeshow

commandsbeforebeginningtoconfiguretherouter.Enterprivilegedmodebyissuingthecommandenable,then

15 of 60 10-12-2012 17:03

issueseveralshow

commandstoseewhattheydisplay.Remember,thecommandshow

willdisplayalltheshowcommandsaavailableinthecurrentmode.Definatelytryoutthefollowingcommands:

Router#showinterfacesRouter#showipprotocolsRouter#showipv6protocolsRouter#showiprouteRouter#showipv6routeRouter#showiparpRouter#showipv6neighbors

Whenyouenterprivilegedmodebyusingthecommandenable,you

16 of 60 10-12-2012 17:03

areinthetop-levelmodeofprivilegedmode,alsoknowninthisdocumentas"parentmode."Itisinthistop-levelorparentmodethatyoucandisplaymostoftheinformationabouttherouter.Asyounowknow,youdothiswiththeshow

commands.Hereyoucanlearntheconfigurationofinterfacesandwhethertheyare

17 of 60 10-12-2012 17:03

upordown.YoucandisplaywhatIPprotocolsareinuse,suchasdynamicroutingprotocols.YoucanviewtherouteandARPtables,andthesearejustafewofthemoreimportantoptions.

Asyouconfiguretherouter,youwillentervarioussub-modestosetoptions,thenreturntotheparentmodetodisplay

18 of 60 10-12-2012 17:03

theresultsofyourcommands.Youalsoreturntotheparentmodetoenterothersub-modes.Toreturntotheparentmode,youhitctrl-z.Thisputsanycommandsyouhavejustissuedintoaffect,andreturnsyoutoparentmode.

3.1Globalconfiguration(config)

Toconfigureanyfeatureoftherouter,youmustenter

19 of 60 10-12-2012 17:03

configurationmode.Thisisthefirstsub-modeoftheparentmode.Intheparentmode,youissuethecommandconfig.

Router#configRouter(config)#

Asdemonstratedabove,thepromptchangestoindicatethemodethatyouarenowin.

Inconnfigurationmodeyoucansetoptionsthatapplysystem-wide,alsoreferedtoas"globalconfigurations."Forinstance,it

20 of 60 10-12-2012 17:03

isagoodideatonameyourroutersothatyoucaneasilyidentifyit.Youdothisinconfigurationmodewiththehostname

command.

Router(config)#hostnameExampleNameExampleName(config)#

Asdemonstratedabove,whenyousetthenameofthehostwiththehostname

command,thepromptimmediatelychangesbyreplacingRouter

withExampleName.(Note:Itisagood

21 of 60 10-12-2012 17:03

ideatonameyourrouterswithanorganizednamingscheme.)

AnotherusefulcommandissuedfromconfigmodeisthecommandtodesignatetheDNSservertobeusedbytherouter:

ExampleName(config)#ipname-serveraa.bb.cc.ddExampleName(config)#ctrl-ZExampleName#

Thisisalsowhereyousetthepasswordforprivilegedmode.

ExampleName(config)#enablesecretexamplepasswordExampleName(config)#ctrl-ZExampleName#

Untilyouhitctrl-Z

22 of 60 10-12-2012 17:03

(ortypeexit

untilyoureachparentmode)yourcommandhasnotbeenputintoaffect.Youcanenterconfigmode,issueseveraldifferentcommands,thenhitctrl-Z

toactivatethemall.Eachtimeyouhitctrl-Z

youreturntoparentmodeandtheprompt:

ExampleName#

Hereyouuseshow

commandstoverifytheresultsofthe

23 of 60 10-12-2012 17:03

commandsyouissuedinconfigmode.Toverifytheresultsoftheip

name-server

command,issuethecommandshow

3.2ConfiguringCiscorouterinterfaces

Ciscointerfacenamingisstraightforward.Individualinterfacesarereferredtobythisconvention:

mediatypeslot#/port#

"Mediatype"referstothetypeofmediathattheportisaninterface

24 of 60 10-12-2012 17:03

for,suchasEthernet,TokenRing,FDDI,serial,etc.Slotnumbersareonlyapplicableforroutersthatprovideslotsintowhichyoucaninstallmodules.Thesemodulescontainseveralportsforagivenmedia.The7200seriesisanexample.Thesemodulesareevenhot-swapable.Youcanremoveamodulefromaslotandreplaceitwitha

25 of 60 10-12-2012 17:03

differentmodule,withoutinterruptingserviceprovidedbytheothermodulesinstalledintherouter.Theseslotsarenumberedontherouter.

Portnumberreferstotheportinreferencetotheotherportsinthatmodule.Numberingisleft-to-right,andallnumberingstartsat0,notatone.

Forexample,aCisco7206isa

26 of 60 10-12-2012 17:03

7200seriesrouterwithsixslots.TorefertoaninterfacethatisthethirdportofanEthernetmoduleinstalledinthesixthslot,itwouldbeinterfaceethernet6/2.Therefor,todisplaytheconfigurationofthatinterfaceyouusethecommand:

ExampleName#showinterfaceethernet6/2

Ifyourrouterdoesnothaveslots,likea1600,

27 of 60 10-12-2012 17:03

thentheinterfacenameconsistsonlyof:

mediatypeport#

Forexample:

ExampleName#showinterfaceserial0

HereisanexampleofconfiguringaserialportwithanIPaddress:

ExampleName#configExampleName(config)#interfaceserial1/1ExampleName(config-if)#ipaddress192.168.155.2255.255.255.0ExampleName(config-if)#ipv6addressfe80::230:1bff:fe80:b8ea/64ExampleName(config-if)#ipv6enableExampleName(config-if)#noshutdownExampleName(config-if)#ctrl-ZExampleName#

Thentoverifyconfiguration:

ExampleName#showinterface

28 of 60 10-12-2012 17:03

serial1/1

Notetheno

shutdown

command.Aninterfacemaybecorrectlyconfiguredandphysicallyconnected,yetbe"administrativelydown."Inthisstateitwillnotfunction.Thecommandforcausinganinterfacetobeadministrativelydownisshutdown.

ExampleName(config)#interfaceserial1/1ExampleName(config-if)#shutdownExampleName(config-if)#ctrl-ZExampleName#showinterfaceserial1/1

IntheCiscoIOS,thewaytoreverseor

29 of 60 10-12-2012 17:03

deletetheresultsofanycommandistosimplyputno

infrontofit.Forinstance,ifwewantedtounassigntheIPaddresswehadassignedtointerfaceserial1/1:

ExampleName(config)#interfaceserail1/1ExampleName(config-if)#noipaddress192.168.155.2255.255.255.0ExampleName(config-if)ctrl-ZExampleName#showinterfaceserial1/1

ConfiguringmostinterfacesforLANconnectionsmightconsistonlyofassigninganetworklayer

30 of 60 10-12-2012 17:03

addressandmakingsuretheinterfaceisnotadministrativelyshutdown.Itisusuallynotnecessarytostipulatedata-linklayerencapsulation.Notethatitisoftennecessarytostipulatetheappropriatedata-linklayerencapsulationforWANconnections,suchasframe-relayandATM.SerialinterfacesdefaulttousingHDLC.Adiscussionofdata-linkprotocolsisoutsidethescopeofthis

31 of 60 10-12-2012 17:03

document.YouwillneedtolookuptheIOScommandencapsulation

formoredetails.

3.3ConfiguringCiscoRouting

IProutingisautomaticallyenabledonCiscorouters.Ifithasbeenpreviouslydisabledonyourrouter,youturnitbackoninconfigmodewiththecommandiprouting.

ExampleName(config)#iproutingExampleName(config)#ctrl-Z

ToenableIPv6routing,

32 of 60 10-12-2012 17:03

usethecommandipv6unicast-routing.

ExampleName(config)#ipv6unicast-routingExampleName(config)#ctrl-Z

Therearetwomainwaysarouterknowswheretosendpackets.Theadministratorcanassignstaticroutes,ortheroutercanlearnroutesbyemployingadynamicroutingprotocol.

Staticroutesaregenerallyusedinverysimplenetworksorinparticularcasesthatnecessitatetheiruse.

33 of 60 10-12-2012 17:03

Tocreateastaticroute,theadministratortellstherouteroperatingsystemthatanynetworktrafficdestinedforaspecifiednetworklayeraddressshouldbeforwardedtoasimiliarlyspecifiednetworklayeraddress.IntheCiscoIOSthisisdonewiththeip

andipv6routecommands.

ExampleName#configExampleName(config)#iproute172.16.0.0255.255.255.0192.168.150.1ExampleName(config)#ctrl-ZExampleName#showiproute

34 of 60 10-12-2012 17:03

ExampleName#configExampleName(config)#ipv6routefe80::230:1bff:fe80::/64fe80::230:1bff:fe80::1ExampleName(config)#ctrl-ZExampleName#showipv6route

Twothingstobesaidaboutthisexample.First,thepacketdestinationaddressmustincludethesubnetmaskforthatdestinationnetwork.Second,theaddressitistobeforwardedtoisthespecifiedaddresofthenextrouteralongthepathtothedestination.Thisisthemostcommon

35 of 60 10-12-2012 17:03

wayofsettingupastaticroute,andtheonlyonethisdocumentcovers.Beaware,however,thatthereareothermethods.

Dynamicroutingprotocols,runningonconnectedrouters,enablethoserouterstoshareroutinginformation.Thisenablesrouterstolearntheroutesavailabletothem.Theadvantageofthismethodisthatroutersareableto

36 of 60 10-12-2012 17:03

adjusttochangesinnetworktopologies.Ifarouteisphysicallyremoved,oraneighborroutergoesdown,theroutingprotocolsearchesforanewroute.Routingprotocolscanevendynamicallychoosebetweenpossibleroutesbasedonvariablessuchasnetworkcongestionornetworkreliability.

Therearemanydifferentroutingprotocols,andtheyallusedifferentvariables,

37 of 60 10-12-2012 17:03

knownas"metrics,"todecideuponappropriateroutes.Unfortunately,arouterneedstoberunningthesameroutingprotocolsasitsneighbors.Manyrouterscan,however,runmutlipleprotocols.Also,manyprotocolsaredesignedtobeabletopassroutinginformationtootherroutingprotocols.Thisiscalled"redistribution."

Routingprotocolsareacomplextopicandthis

38 of 60 10-12-2012 17:03

documentcontainsonlythissuperficialdescriptionofthem.Thereismuchtolearnaboutthem,andtherearemanysourcesofinformationaboutthemavailable.AnexcelentsourceofinformationonthistopicisCisco'swebsite,http://www.cisco.com.

3.4IPv6configurationwithIOS

ThisisaseperatesectionbecauseIPv6isnewtomostpeople,and

39 of 60 10-12-2012 17:03

theywillbelookingspecificallyforinformationaboutconfiguringIPv6.ExamplesofconfiguringIPv6areincludedthroughoutthedocument,however,alongsideIPv4.ThatisamoreaccuratereflectionofhowyouwillworkwithIPv6onaday-to-daybasis.OncethenewnessofIPv6passes,itwillbeonemorepieceinthefamiliarpuzzle.

Theimportant

40 of 60 10-12-2012 17:03

concepttounderstandwhenconfiguringIPv6isthatIPv4andIPv6existinparrallel.Oneisnotareplacementfortheother,atleastnotinthewayitistreatedbytheoperatingsystem.Atermforthisisdualstack.AninterfacecanhaveanIPv4addressandnoIPv6address.OranIPv6addressand

41 of 60 10-12-2012 17:03

noIPv4address.OrbothanIPv4addressandanIPv6address.Examples:

IPv4only

!interfaceFastEthernet0/0ipaddress192.168.1.138255.255.255.0!

IPv6only

!interfaceFastEthernet0/0ipv6addressfe80::230:1bff:fe80::/64ipv6enable!

IPv4andIPv6

!interfaceFastEthernet0/0ipaddress192.168.1.138255.255.255.0ipv6addressfe80::230:1bff:fe80::/64ipv6enable!

Noticethatthereareseperatebutsimiliarcommandsfor

42 of 60 10-12-2012 17:03

IPv4andIPv6.ToassignanIPv4address,

ExampleName(config-if)#ipaddress192.168.1.138255.255.255.0

ToassignanIPv6address,

ExampleName(config-if)#ipv6addressfe80::230:1bff:fe80::/64

TherearesomebiggerdifferencesbetweenIPv4andIPv6IOScommands.Forexample,theIPv6equivilantofshowip

arp,isshowipv6

neighbors.

3.5SavingyourCiscoRouterconfiguration

Onceyou

43 of 60 10-12-2012 17:03

haveconfiguredroutingontherouter,andyouhaveconfiguredindividualinterfaces,yourroutershouldbecapableofroutingtraffic.Giveitafewmomentstotalktoitsneighbors,thenissuethecommandsshowip

andshowip

arp.Thereshouldnowbeentriesinthesetableslearnedfromtheroutingprotocol.

Ifyouturnedthe

44 of 60 10-12-2012 17:03

routeroffrightnow,andturneditonagain,youwouldhavetostartconfigurationoveragain.Yourrunningconfigurationisnotsavedtoanyperminentstoragemedia.Youcanseethisconfigurationwiththecommandshowrunning-

config.

ExampleName#showrunning-config

Youdowanttosaveyoursuccessfulrunningconfiguration.Issuethecommandcopyrunning-configstartup-

45 of 60 10-12-2012 17:03

config.

ExampleName#copyrunning-configstartup-config

Yourconfigurationisnowsavedtonon-volatileRAM(NVRAM).Issuethecommandshowstartup-

config.

ExampleName#showstartup-config

Nowanytimeyouneedtoreturnyourroutertothatconfiguration,issuethecommandcopystartup-configrunning-

config.

ExampleName#copystartup-configrunning-config

3.6ExampleCiscoRouterconfiguration

Router>enable1.

46 of 60 10-12-2012 17:03

Router#config2.Router(config)#hostnameN115-7206

N115-7206(config)#interfaceserial1/1

N115-7206(config-if)ipaddress192.168.155.2255.255.255.0

N115-7206(config-if)ipv6addressfe80::230:1bff:fe80:b8ea/64

N115-7206(config-if)ipv6enable

N115-7206(config-if)noshutdown

N115-7206(config-if)ctrl-z

N115-7206#showinterfaceserial1/1

N115-7206#config11.N115-7206(config)#interfaceethernet2/3

N115-7206(config-if)#ipaddress192.168.150.90255.255.255.0

N115-7206(config-if)#noshutdown

N115-7206(config-if)#ctrl-z

N115-7206#showinterfaceethernet2/3

N115-7206#config17.N115-7206(config)#ipname-server172.16.0.10

N115-7206(config)#ctrl-z19.N115-7206#pingarchie.au

N115-7206#config21.N115-7206(config)#enablesecretpassword

N115-7206(config)#ctrl-z23.N115-7206#copyrunning-config

47 of 60 10-12-2012 17:03

startup-configN115-7206#exit25.

4.TroubleshootingyourCiscorouter

Inevitably,therewillbeproblems.Usually,itwillcomeintheformofausernotifyingyouthattheycannotreachacertaindestination,oranydestinattionatall.Youwillneedtobeabletocheckhowtherouterisattemptingtoroute

48 of 60 10-12-2012 17:03

traffic,andyoumustbeabletotrackdownthepointoffailure.

Youarealreadyfamiliarwiththeshow

commands,bothspecificcommandsandhowtolearnwhatothershow

commandsareavailable.Someofthemostbasic,mostusefulcommandsyouwillusefortroubleshootingare:

Router#showinterfacesRouter#showipprotocolsRouter#showipv6protocolsRouter#show

49 of 60 10-12-2012 17:03

iprouteRouter#showipv6routeRouter#showiparpRouter#showipv6neighbors

4.1Testingconnectivity

Itisverypossiblethatthepointoffailureisnotinyourrouterconfiguration,oratyourrouteratall.Ifyouexamineyourrouter'sconfigurationandoperationandeverythinglooksgood,theproblemmightbebefartheruptheline.Infact,

50 of 60 10-12-2012 17:03

itmaybethelineitself,oritcouldbeanotherrouter,whichmayormaynotbeunderyouradministration.

Oneextremelyusefulandsimplediagnostictoolistheping

command.PingisanimplementationoftheIPMessageControlProtocol(ICMP).PingsendsanICMPechorequesttoadestinationIPaddress.Ifthedestination

51 of 60 10-12-2012 17:03

machinereceivestherequest,itrespondswithanICMPechoresponse.Thisisaverysimpleexchangethatconsistsof:

Hello,areyoualive?

Yes,Iam.

ExampleName#pingxx.xx.xx.xx

Ifthepingtestissuccessful,youknowthatthedestinationyouarehavingdifficultyreachingisaliveandphysicallyreachable.

Iftherearerouters

52 of 60 10-12-2012 17:03

betweenyourrouterandthedestinationyouarehavingdifficultyreaching,theproblemmightbeatoneoftheotherrouters.Evenifyouping

arouteranditresponds,itmighthaveotherinterfacesthataredown,itsroutingtablemaybecorrupted,oranynumberofotherproblemsmayexist.

Toseewherepacketsthat

53 of 60 10-12-2012 17:03

leaveyourrouterforaparticulardestinationgo,andhowfar,usethetrace

command.

ExampleName#tracexx.xx.xx.xx

Itmaytakeafewminutesforthisutilitytofinish,sogiveitsometime.Itwilldisplayalistofallthehopsitmakesonthewaytothedestination.

4.2debug

commands

54 of 60 10-12-2012 17:03

areseveraldebug

commandsprovidedbytheIOS.Thesecommandsarenotcoveredhere.RefertotheCiscowebsiteformoreinformation.

4.3Hardwareandphysicalconnections

Donotoverlookthepossibilitythatthepointoffailureisahardwareorphysicalconnectionfailure.Anynumberofthingscangowrong,fromboardfailuresto

55 of 60 10-12-2012 17:03

cutcablestopowerfailures.Thisdocumentwillnotdescribewtroubleshootingtheseproblems,exceptforthesesimplethings.

Checktoseethattherouteristurnedon.Alsomakesurethatnocablesarelooseordamaged.Finally,makesurecablesarepluggedintothecorrectports.Beyondthissimpleadviceyouwillneedtocheckother

56 of 60 10-12-2012 17:03

sources.

4.4Outofyourcontrol

Ifthepointoffailureisfartheruptheline,theprolemmightliewithequipmentnotunderyouradministration.Youronlyoptionmightbetocontacttheequipment'sadministrator,notifythemofyourproblem,andaskthemforhelp.Itisinyourinteresttobecourtiousand

57 of 60 10-12-2012 17:03

respectful.Theotheradministratorhastheirownproblems,theirownworkloadandtheirownpriorities.Theiragendamightevendirectlyconflictwithyours,suchastheirintentiontochangedynamicroutingprotocols,etc.Youmustworkwiththem,evenifthesituationisfrustrating.Alienatingsomeonewiththepowertoblockimportantroutestoyournetworkisnot

58 of 60 10-12-2012 17:03

agoodidea.

5.References

Leinwand,PinskyandCulpepperCiscoRouterConfiguration.Indianapolis,Indiana:CiscoPress,1998.CiscoSystems,Inc.,http://www.cisco.com

6.Moreinformation

CiscoQuickTips

MytutorialonIPsubnetcalculations

CiscoT1LoadBalancing

PDFversionsofthisandotherdocumentsbyJoshGentry

Ads by Google Cisco Router Cisco Server Cisco About Cisco Connect

59 of 60 10-12-2012 17:03

Web joshgentry.com

Authored by Josh Gentry

60 of 60 10-12-2012 17:03

Cisco Router Configuration Tutorial

Documents

Transcript of Cisco Router Configuration Tutorial

DMVPN Spoke with Cisco Router - M2M Nordic ApS · DMVPN Spoke with Cisco Router 5 Chapter 3 Configuration 3.1 Cisco Router Configuration Following is the configuration reference for

Basic Router Configuration [Support] - Cisco Systems

Cisco 806 Router Software Configuration Guide

24891790 Guide to Cisco Router Configuration

Rat CISCO Perform Security Audit Configuration File Cisco Router

Cisco Router Configuration Basics

Cisco router configuration handbook 2nd.edition

Basic Router Configuration Using SDM - Cisco Systems

Cisco Router Configuration Basics Nishal Goburdhan.

Cisco Router Configuration Handbook 2nd.pdf

Cisco Router 871Wcaclab.csd.auth.gr/yliko_eksoikeiwshs.pdf · 9 Cisco Router 871W ... Router# disable ... Router(config)# router eigrp 1 Enters router configuration mode from global

Basic router configuration using Cisco Configuration Professional

Cisco router configuration tutorial

Cisco 805 Router Software Configuration Guide

3 Router Configuration - Cisco Packet Tracer

Cisco - Basic Router Configuration Using Cisco …tzokev.tu-sofia.bg/uploads/Lectures/CCNASecurity/ccp.pdfBasic Router Configuration Using Cisco Configuration Professional Document

Cisco Router Configuration Basics Scalable Infrastructure Workshop.

Cisco Router Configuration Step by Step | Cisco Configuration Book

Basic Router Configuration using SDM - Cisco

Introduction to Cisco Router Configuration