Cisco 2960 X Owners Manual
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PurposeCommand or Action
EnablestheCiscoIOSagent,andinitiatesaninitialconfiguration.cnsconfiginitial{hostname|ip-address}
[port-number][event][no-persist][page
page][sourceip-address][syntax-check]
Step 15
•For{hostname|ip-address},enterthehostnameortheIPaddressof
theconfigurationserver.
Example:
RemoteSwitch(config)#cnsconfiginitial10.1.1.1no-persist
•(Optional)Forport-number,entertheportnumberoftheconfiguration
server.Thedefaultportnumberis80....](http://img.usermanuals.tech/thumb/17/102385/w64_2960-x-owners-manual-1511197621_d-36.png "Page 37
PurposeCommand or Action
EnablestheCiscoIOSagent,andinitiatesaninitialconfiguration.cnsconfiginitial{hostname|ip-address}
[port-number][event][no-persist][page
page][sourceip-address][syntax-check]
Step 15
•For{hostname|ip-address},enterthehostnameortheIPaddressof
theconfigurationserver.
Example:
RemoteSwitch(config)#cnsconfiginitial10.1.1.1no-persist
•(Optional)Forport-number,entertheportnumberoftheconfiguration
server.Thedefaultportnumberis80....")
PurposeCommand or Action
ReturnstoprivilegedEXECmode.end
Example:
Switch(config)#end
Step 3
What to Do Next
Toverifyinformationabouttheconfigurationagent,useeithertheshowcnsconfigstatsortheshowcns
configoutstandingcommandinprivilegedEXECmode.
TodisabletheCiscoIOSagent,usethenocnsconfigpartial{ip-address|hostname}globalconfiguration
command.Tocancelapartialconfiguration,usethecnsconfigcancelglobalconfigurationcommand.
Monitoring CNS Configurations
Table 5: CNS show Commands
PurposeCommand
DisplaysthestatusoftheCNSCiscoIOSCNSagent
connections.
showcnsconfigconnections
Switch#showcnsconfigconnections
Displaysinformationaboutincremental(partial)CNS
configurationsthathavestartedbutarenotyet
completed.
showcnsconfigoutstanding
Switch#showcnsconfigoutstanding
DisplaysstatisticsabouttheCiscoIOSCNSagent.showcnsconfigstats
Switch#showcnsconfigstats
DisplaysthestatusoftheCNSeventagent
connections.
showcnseventconnections
Switch#showcnseventconnections
Displaystheeventgatewayinformationforyour
switch.
showcnseventgateway
Switch#showcnseventgateway
DisplaysstatisticsabouttheCNSeventagent.showcnseventstats
Switch#showcnseventstats
Displaysalistofeventagentsubjectsthatare
subscribedtobyapplications.
showcnseventsubject
Switch#showcnseventsubject
Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX
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Configuring Cisco IOS Configuration Engine
Monitoring CNS Configurations
Additional References Related Documents Document TitleRelated Topic CiscoConfigurationEngineInstallationandSetup Guide,1.5forLinuxhttp://www.cisco.com/en/US/ docs/net_mgmt/configuration_engine/1.5/ installation_linux/guide/setup_1.html ConfigurationEngineSetup MIBs MIBs LinkMIB TolocateanddownloadMIBsforselectedplatforms, CiscoIOSreleases,andfeaturesets,useCiscoMIB LocatorfoundatthefollowingURL: http://www.cisco.com/go/mibs Technical Assistance LinkDescription http://www.cisco.com/supportTheCiscoSupportwebsiteprovidesextensiveonline resources,includingdocumentationandtoolsfor troubleshootingandresolvingtechnicalissueswith Ciscoproductsandtechnologies. Toreceivesecurityandtechnicalinformationabout yourproducts,youcansubscribetovariousservices, suchastheProductAlertTool(accessedfromField Notices),theCiscoTechnicalServicesNewsletter, andReallySimpleSyndication(RSS)Feeds. AccesstomosttoolsontheCiscoSupportwebsite requiresaCisco.comuserIDandpassword. Feature History and Information for the Configuration Engine ModificationRelease Thisfeaturewasintroduced.CiscoIOS15.0(2)EX Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX 32OL-29044-01 Configuring Cisco IOS Configuration Engine Additional References
CHAPTER 3
Configuring the Cisco Discovery Protocol
ThischapterdescribestheconfigurationoftheCiscoDiscoveryProtocol(CDP).
•FindingFeatureInformation,page33
•InformationAboutCDP,page33
•HowtoConfigureCDP,page34
•MonitoringandMaintainingCDP,page40
•AdditionalReferences,page41
•FeatureHistoryandInformationforCiscoDiscoveryProtocol,page42
Finding Feature Information
Yoursoftwarereleasemaynotsupportallthefeaturesdocumentedinthismodule.Forthelatestfeature
informationandcaveats,seethereleasenotesforyourplatformandsoftwarerelease.
UseCiscoFeatureNavigatortofindinformationaboutplatformsupportandCiscosoftwareimagesupport.
ToaccessCiscoFeatureNavigator,gotohttp://www.cisco.com/go/cfn.AnaccountonCisco.comisnot
required.
Information About CDP
CDP Overview
CDPisadevicediscoveryprotocolthatrunsoverLayer2(thedata-linklayer)onallCisco-manufactured
devices(routers,bridges,accessservers,controllers,andswitches)andallowsnetworkmanagementapplications
todiscoverCiscodevicesthatareneighborsofalreadyknowndevices.WithCDP,networkmanagement
applicationscanlearnthedevicetypeandtheSimpleNetworkManagementProtocol(SNMP)agentaddress
ofneighboringdevicesrunninglower-layer,transparentprotocols.Thisfeatureenablesapplicationstosend
SNMPqueriestoneighboringdevices.
Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX
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CDPrunsonallmediathatsupportSubnetworkAccessProtocol(SNAP).BecauseCDPrunsoverthedata-link layeronly,twosystemsthatsupportdifferentnetwork-layerprotocolscanlearnabouteachother. EachCDP-configureddevicesendsperiodicmessagestoamulticastaddress,advertisingatleastoneaddress atwhichitcanreceiveSNMPmessages.Theadvertisementsalsocontaintime-to-live,orholdtimeinformation, whichisthelengthoftimeareceivingdeviceholdsCDPinformationbeforediscardingit.Eachdevicealso listenstothemessagessentbyotherdevicestolearnaboutneighboringdevices. Ontheswitch,CDPenablesNetworkAssistanttodisplayagraphicalviewofthenetwork.Theswitchuses CDPtofindclustercandidatesandmaintaininformationaboutclustermembersandotherdevicesuptothree cluster-enableddevicesawayfromthecommandswitchbydefault. CDP and Stacks Aswitchstackappearsasasingleswitchinthenetwork.Therefore,CDPdiscoverstheswitchstack,notthe individualstackmembers.TheswitchstacksendsCDPmessagestoneighboringnetworkdeviceswhenthere arechangestotheswitchstackmembership,suchasstackmembersbeingaddedorremoved. Default CDP Configuration ThistableshowsthedefaultCDPconfiguration. Default SettingFeature EnabledCDPglobalstate EnabledCDPinterfacestate 60secondsCDPtimer(packetupdatefrequency) 180secondsCDPholdtime(beforediscarding) EnabledCDPVersion-2advertisements How to Configure CDP Configuring CDP Characteristics YoucanconfiguretheseCDPcharacteristics: •FrequencyofCDPupdates •Amountoftimetoholdtheinformationbeforediscardingit •WhetherornottosendVersion-2advertisements Steps2through4arealloptionalandcanbeperformedinanyorder.Note Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX 34OL-29044-01 Configuring the Cisco Discovery Protocol CDP and Stacks
BeginninginprivilegedEXECmode,followthesestepstoconfigurethesecharacteristics. SUMMARY STEPS 1.configureterminal 2.cdptimerseconds 3.cdpholdtimeseconds 4.cdpadvertise-v2 5.end DETAILED STEPS PurposeCommand or Action Enterstheglobalconfigurationmode.configureterminal Example: Switch#configureterminal Step 1 (Optional)SetsthetransmissionfrequencyofCDPupdatesin seconds. cdptimerseconds Example: Switch(config)#cdptimer20 Step 2 Therangeis5to254;thedefaultis60seconds. (Optional)Specifiestheamountoftimeareceivingdeviceshould holdtheinformationsentbyyourdevicebeforediscardingit. cdpholdtimeseconds Example: Switch(config)#cdpholdtime60 Step 3 Therangeis10to255seconds;thedefaultis180seconds. (Optional)ConfiguresCDPtosendVersion-2advertisements.cdpadvertise-v2Step 4 Example: Switch(config)#cdpadvertise-v2 Thisisthedefaultstate. ReturnstoprivilegedEXECmode.end Example: Switch(config)#end Step 5 Example ThefollowingexampleshowshowtoconfigureCDPcharacteristics: Switch#configureterminalSwitch(config)#cdptimer50Switch(config)#cdpholdtime120 Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX OL-29044-0135 Configuring the Cisco Discovery Protocol Configuring CDP Characteristics
Switch(config)#cdpadvertise-v2Switch(config)#end What to Do Next UsethenoformoftheCDPcommandstoreturntothedefaultsettings. Related Topics MonitoringandMaintainingCDP,onpage40 Disabling CDP CDPisenabledbydefault. SwitchclustersandotherCiscodevices(suchasCiscoIPPhones)regularlyexchangeCDPmessages. DisablingCDPcaninterruptclusterdiscoveryanddeviceconnectivity. Note BeginninginprivilegedEXECmode,followthesestepstodisabletheCDPdevicediscoverycapability. SUMMARY STEPS 1.configureterminal 2.nocdprun 3.end DETAILED STEPS PurposeCommand or Action Enterstheglobalconfigurationmode.configureterminal Example: Switch#configureterminal Step 1 DisablesCDP.nocdprun Example:Switch(config)#nocdprun Step 2 ReturnstoprivilegedEXECmode.end Example: Switch(config)#end Step 3 Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX 36OL-29044-01 Configuring the Cisco Discovery Protocol Disabling CDP
What to Do Next YoumustreenableCDPtouseit. Related Topics EnablingCDP,onpage37 Enabling CDP CDPisenabledbydefault. SwitchclustersandotherCiscodevices(suchasCiscoIPPhones)regularlyexchangeCDPmessages. DisablingCDPcaninterruptclusterdiscoveryanddeviceconnectivity. Note BeginninginprivilegedEXECmode,followthesestepstoenableCDPwhenithasbeendisabled. Before You Begin CDPmustbedisabled,oritcannotbeenabled. SUMMARY STEPS 1.configureterminal 2.cdprun 3.end DETAILED STEPS PurposeCommand or Action Enterstheglobalconfigurationmode.configureterminal Example: Switch#configureterminal Step 1 EnablesCDPifithasbeendisabled.cdprun Example:Switch(config)#cdprun Step 2 ReturnstoprivilegedEXECmode.end Example: Switch(config)#end Step 3 Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX OL-29044-0137 Configuring the Cisco Discovery Protocol Enabling CDP
Example ThefollowingexampleshowshowtoenableCDPifithasbeendisabled: Switch#configureterminalSwitch(config)#cdprunSwitch(config)#end What to Do Next UsetheshowrunallcommandtoshowthatCDPhasbeenenabled.Ifyouenteronlyshowrun,the enablingofCDPmaynotbedisplayed. Related Topics DisablingCDP,onpage36 Disabling CDP on an Interface CDPisenabledbydefaultonallsupportedinterfacestosendandtoreceiveCDPinformation. SwitchclustersandotherCiscodevices(suchasCiscoIPPhones)regularlyexchangeCDPmessages. DisablingCDPcaninterruptclusterdiscoveryanddeviceconnectivity. Note BeginninginprivilegedEXECmode,followthesestepstodisableCDPonaport. SUMMARY STEPS 1.configureterminal 2.interfaceinterface-id 3.nocdpenable 4.end DETAILED STEPS PurposeCommand or Action Enterstheglobalconfigurationmode.configureterminal Example: Switch#configureterminal Step 1 SpecifiestheinterfaceonwhichyouaredisablingCDP, andentersinterfaceconfigurationmode. interfaceinterface-id Example:Switch(config)#interfacegigabitethernet1/0/1 Step 2 Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX 38OL-29044-01 Configuring the Cisco Discovery Protocol Disabling CDP on an Interface
PurposeCommand or Action DisablesCDPontheinterfacespecifiedinStep2.nocdpenable Example:Switch(config-if)#nocdpenable Step 3 ReturnstoprivilegedEXECmode.end Example:Switch(config-if)#end Step 4 Related Topics EnablingCDPonanInterface,onpage39 Enabling CDP on an Interface CDPisenabledbydefaultonallsupportedinterfacestosendandtoreceiveCDPinformation. SwitchclustersandotherCiscodevices(suchasCiscoIPPhones)regularlyexchangeCDPmessages. DisablingCDPcaninterruptclusterdiscoveryanddeviceconnectivity. Note BeginninginprivilegedEXECmode,followthesestepstoenableCDPonaportonwhichithasbeendisabled. Before You Begin CDPmustbedisabledontheportthatyouaretryingtoCDPenableon,oritcannotbeenabled. SUMMARY STEPS 1.configureterminal 2.interfaceinterface-id 3.cdpenable 4.end DETAILED STEPS PurposeCommand or Action Enterstheglobalconfigurationmode.configureterminal Example: Switch#configureterminal Step 1 Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX OL-29044-0139 Configuring the Cisco Discovery Protocol Enabling CDP on an Interface
PurposeCommand or Action SpecifiestheinterfaceonwhichyouareenablingCDP, andentersinterfaceconfigurationmode. interfaceinterface-id Example:Switch(config)#interfacegigabitethernet1/0/1 Step 2 EnablesCDPonadisabledinterface.cdpenable Example:Switch(config-if)#cdpenable Step 3 ReturnstoprivilegedEXECmode.end Example:Switch(config-if)#end Step 4 Example ThefollowingexampleshowshowtoenableCDPonadisabledport: Switch#configureterminalSwitch(config)#interfacegigabitethernet1/0/1Switch(config-if)#cdpenableSwitch(config-if)#end Related Topics DisablingCDPonanInterface,onpage38 Monitoring and Maintaining CDP Table 6: Commands for Displaying CDP Information DescriptionCommand Resetsthetrafficcounterstozero.clearcdpcounters DeletestheCDPtableofinformationaboutneighbors.clearcdptable Displaysglobalinformation,suchasfrequencyoftransmissions andtheholdtimeforpacketsbeingsent. showcdp Catalyst 2960-X Switch Network Management Configuration Guide, Cisco IOS Release 15.0(2)EX 40OL-29044-01 Configuring the Cisco Discovery Protocol Monitoring and Maintaining CDP