IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T PDF
Preview IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T
IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THESPECIFICATIONSANDINFORMATIONREGARDINGTHEPRODUCTSINTHISMANUALARESUBJECTTOCHANGEWITHOUTNOTICE.ALLSTATEMENTS, INFORMATION,ANDRECOMMENDATIONSINTHISMANUALAREBELIEVEDTOBEACCURATEBUTAREPRESENTEDWITHOUTWARRANTYOFANYKIND, EXPRESSORIMPLIED.USERSMUSTTAKEFULLRESPONSIBILITYFORTHEIRAPPLICATIONOFANYPRODUCTS. THESOFTWARELICENSEANDLIMITEDWARRANTYFORTHEACCOMPANYINGPRODUCTARESETFORTHINTHEINFORMATIONPACKETTHATSHIPPEDWITH THEPRODUCTANDAREINCORPORATEDHEREINBYTHISREFERENCE.IFYOUAREUNABLETOLOCATETHESOFTWARELICENSEORLIMITEDWARRANTY, CONTACTYOURCISCOREPRESENTATIVEFORACOPY. 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AnyInternetProtocol(IP)addressesandphonenumbersusedinthisdocumentarenotintendedtobeactualaddressesandphonenumbers.Anyexamples,commanddisplayoutput,network topologydiagrams,andotherfiguresincludedinthedocumentareshownforillustrativepurposesonly.AnyuseofactualIPaddressesorphonenumbersinillustrativecontentisunintentional andcoincidental. CiscoandtheCiscologoaretrademarksorregisteredtrademarksofCiscoand/oritsaffiliatesintheU.S.andothercountries.ToviewalistofCiscotrademarks,gotothisURL:http:// www.cisco.com/go/trademarks.Third-partytrademarksmentionedarethepropertyoftheirrespectiveowners.Theuseofthewordpartnerdoesnotimplyapartnership relationshipbetweenCiscoandanyothercompany.(1110R) ©2016CiscoSystems,Inc.Allrightsreserved. CONTENTS CHAPTER 1 DHCPOverview 1 InformationAboutDHCP 1 DHCPOverview 1 BenefitsofUsingCiscoIOSDHCP 2 DHCPServerRelayAgentandClientOperation 2 DHCPDatabase 3 DHCPAttributeInheritance 4 DHCPOptionsandSuboptions 4 DHCPServerOn-DemandAddressPoolManagementOverview 5 DHCPServicesforAccountingandSecurityOverview 6 AdditionalReferences 6 Glossary 8 CHAPTER 2 ConfiguringtheCiscoIOSDHCPServer 9 FindingFeatureInformation 9 PrerequisitesforConfiguringtheDHCPServer 9 InformationAbouttheCiscoIOSDHCPServer 10 OverviewoftheDHCPServer 10 DHCPAttributeInheritance 10 DHCPServerAddressAllocationUsingOption82 10 HowtoConfiguretheCiscoIOSDHCPServer 12 ConfiguringaDHCPDatabaseAgentorDisablingConflictLogging 12 ExcludingIPAddresses 14 ConfiguringDHCPAddressPools 15 ConfiguringaDHCPAddressPool 15 ConfiguringaDHCPAddressPoolwithSecondarySubnets 19 TroubleshootingTips 24 VerifyingtheDHCPAddressPoolConfiguration 24 IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T iii Contents ConfiguringManualBindings 26 TroubleshootingTips 28 ConfiguringDHCPStaticMapping 29 ConfiguringtheDHCPServertoReadaStaticMappingTextFile 30 CustomizingDHCPServerOperation 33 ConfiguringaRemoteDevicetoImportDHCPServerOptionsfromaCentralDHCP Server 34 ConfiguringtheCentralDHCPServertoUpdateDHCPOptions 34 ConfiguringtheRemoteDevicetoImportDHCPOptions 36 ConfiguringDHCPAddressAllocationUsingOption82 38 EnablingOption82forDHCPAddressAllocation 38 TroubleshootingTips 39 DefiningtheDHCPClassandRelayAgentInformationPatterns 39 TroubleshootingTips 40 DefiningtheDHCPAddressPool 40 ConfiguringaStaticRoutewiththeNext-HopDynamicallyObtainedThroughDHCP 42 ClearingDHCPServerVariables 44 ConfigurationExamplesfortheCiscoIOSDHCPServer 45 Example:ConfiguringtheDHCPDatabaseAgent 45 Example:ExcludingIPAddresses 45 Example:ConfiguringDHCPAddressPools 45 Example:ConfiguringaDHCPAddressPoolwithMultipleDisjointSubnets 46 Example:ConfiguringManualBindings 48 Example:ConfiguringStaticMapping 48 Example:ConfiguringtheOptiontoIgnoreallBOOTPRequests 48 Example:ImportingDHCPOptions 50 Example:ConfiguringDHCPAddressAllocationUsingOption82 51 Example:ConfiguringaStaticRoutewiththeNext-HopDynamicallyObtainedThrough DHCP 51 AdditionalReferencesforCiscoIOSDHCPServer 52 FeatureInformationfortheCiscoIOSDHCPServer 53 CHAPTER 3 ConfiguringtheDHCPServerOn-DemandAddressPoolManager 55 FindingFeatureInformation 55 PrerequisitesforConfiguringtheDHCPServerOn-DemandAddressPoolManager 56 IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T iv Contents RestrictionsforConfiguringtheDHCPServerOn-DemandAddressPoolManager 56 InformationAbouttheDHCPServerOn-DemandAddressPoolManager 56 ODAPManagerOperation 56 SubnetAllocationServerOperation 58 BenefitsofUsingODAPs 59 HowtoConfiguretheDHCPServerOn-DemandAddressPoolManager 59 SpecifyingDHCPODAPsastheGlobalDefaultMechanism 59 DefiningDHCPODAPsonanInterface 60 ConfiguringtheDHCPPoolasanODAP 61 ConfiguringODAPstoObtainSubnetsThroughIPCPNegotiation 63 ConfiguringAAA 65 ConfiguringRADIUS 66 ODAPAAAProfile 66 DisablingODAPs 68 VerifyingODAPOperation 69 TroubleshootingTips 72 MonitoringandMaintainingtheODAP 72 ConfiguringDHCPODAPSubnetAllocationServerSupport 74 ConfiguringaGlobalSubnetPoolonaSubnetAllocationServer 74 GlobalSubnetPools 74 ConfiguringaVRFSubnetPoolonaSubnetAllocationServer 75 VRFSubnetPools 75 UsingaVPNIDtoConfigureaVRFSubnetPoolonaSubnetAllocationServer 76 VRFPoolsandVPNIDs 77 VerifyingSubnetAllocationandDHCPBindings 79 TroubleshootingtheDHCPODAPSubnetAllocationServer 80 ConfigurationExamplesforDHCPServerOn-DemandAddressPoolManager 81 SpecifyingDHCPODAPsastheGlobalDefaultMechanismExample 81 DefiningDHCPODAPsonanInterfaceExample 81 ConfiguringtheDHCPPoolasanODAPExample 82 ConfiguringtheDHCPPoolasanODAPforNon-MPLSVPNsExample 84 IPCPSubnetMaskDeliveryExample 84 ConfiguringAAAandRADIUSExample 86 ConfiguringaGlobalPoolonaSubnetAllocationServerExample 86 ConfiguringaVRFPoolonaSubnetAllocationServerExample 87 IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T v Contents UsingaVPNIDtoConfigureaVRFPoolonaSubnetAllocationServerExample 87 VerifyingLocalConfigurationonaSubnetAllocationServerExample 87 VerifyingAddressPoolAllocationInformationExample 88 VerifyingSubnetAllocationandDHCPBindingsExample 88 AdditionalReferences 89 FeatureInformationfortheDHCPServerOn-DemandAddressPoolManager 90 Glossary 91 CHAPTER 4 ConfiguringtheCiscoIOSDHCPRelayAgent 93 FindingFeatureInformation 93 PrerequisitesforConfiguringtheCiscoIOSDHCPRelayAgent 93 InformationAbouttheDHCPRelayAgent 94 DHCPRelayAgentOverview 94 HowtoConfiguretheDHCPRelayAgent 94 SpecifyingthePacketForwardingAddress 94 ConfiguringSupportfortheRelayAgentInformationOption 95 ConfiguringPer-InterfaceSupportfortheRelayAgentInformationOption 99 ConfiguringtheSubscriberIdentifierSuboptionoftheRelayAgentInformationOption 101 ConfiguringDHCPRelayClassSupportforClientIdentification 102 ConfiguringDHCPRelayAgentSupportforMPLSVPNs 105 ConfiguringSupportforRelayAgentInformationOptionEncapsulation 106 SettingtheGatewayAddressoftheDHCPBroadcasttoaSecondaryAddressUsingSmart RelayAgentForwarding 109 ConfiguringSupportforPrivateandStandardSuboptionNumbers 110 TroubleshootingtheDHCPRelayAgent 111 ConfigurationExamplesfortheCiscoIOSDHCPRelayAgent 112 Example:ConfiguringSupportfortheRelayAgentInformationOption 112 Example:ConfiguringPer-InterfaceSupportfortheRelayAgentInformationOption 113 Example:ConfiguringtheSubscriberIdentifierSuboptionoftheRelayAgentInformation Option 113 Example:ConfiguringDHCPRelayClassSupportforClientIdentification 114 Example:ConfiguringDHCPRelayAgentSupportforMPLSVPNs 114 Example:ConfiguringSupportforRelayAgentInformationOptionEncapsulation 114 Example:SettingtheGatewayAddressoftheDHCPBroadcasttoaSecondaryAddress UsingSmartRelayAgentForwarding 115 IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T vi Contents AdditionalReferences 115 FeatureInformationfortheCiscoIOSDHCPRelayAgent 116 Glossary 119 CHAPTER 5 DHCPClient 121 FindingFeatureInformation 121 RestrictionsfortheDHCPClient 121 InformationAbouttheDHCPClient 122 DHCPClientOperation 122 DHCPClientOverview 122 HowtoConfiguretheDHCPClient 123 ConfiguringtheDHCPClient 123 ConfigurationExamplesfortheDHCPClient 125 Example:ConfiguringtheDHCPClient 125 AdditionalReferences 125 FeatureInformationfortheDHCPClient 126 CHAPTER 6 ConfiguringDHCPServicesforAccountingandSecurity 127 FindingFeatureInformation 127 PrerequisitesforConfiguringDHCPServicesforAccountingandSecurity 128 InformationAboutDHCPServicesforAccountingandSecurity 128 DHCPOperationinPublicWirelessLANs 128 SecurityVulnerabilitiesinPublicWirelessLANs 128 DHCPServicesforSecurityandAccountingOverview 128 DHCPLeaseLimits 129 HowtoConfigureDHCPServicesforAccountingandSecurity 129 ConfiguringAAAandRADIUSforDHCPAccounting 129 RADIUSAccountingAttributes 129 TroubleshootingTips 132 ConfiguringDHCPAccounting 132 VerifyingDHCPAccounting 134 SecuringARPTableEntriestoDHCPLeases 135 TroubleshootingTips 136 ConfiguringDHCPAuthorizedARP 136 ConfiguringaDHCPLeaseLimittoGloballyControltheNumberofSubscribers 139 IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T vii Contents TroubleshootingTips 140 ConfiguringaDHCPLeaseLimittoControltheNumberofSubscribersonanInterface 140 TroubleshootingTips 142 ConfigurationExamplesforDHCPServicesforAccountingandSecurity 142 ExampleConfiguringAAAandRADIUSforDHCPAccounting 142 ExampleConfiguringDHCPAccounting 143 ExampleVerifyingDHCPAccounting 143 ExampleConfiguringDHCPAuthorizedARP 144 ExampleVerifyingDHCPAuthorizedARP 145 ExampleConfiguringaDHCPLeaseLimit 145 AdditionalReferences 146 TechnicalAssistance 147 FeatureInformationforDHCPServicesforAccountingandSecurity 147 CHAPTER 7 ConfiguringDHCPEnhancementsforEdge-SessionManagement 151 FindingFeatureInformation 151 InformationAboutDHCPEnhancementsforEdge-SessionManagement 152 DHCPServersandRelayAgents 152 On-DemandAddressPoolManagement 152 DesignoftheDHCPEnhancementsforEdge-SessionManagementFeature 152 DHCPServerCo-ResidentwiththeSG 153 DHCPRelayAgentCo-ResidentwiththeSG 153 BenefitsoftheDHCPEnhancementsforEdge-SessionManagement 153 HowtoConfigureDHCPEnhancementsforEdge-SessionManagement 154 ConfiguringtheDHCPAddressPoolandaClassName 154 ConfiguringaRelayPoolwithaRelaySourceandDestination 156 ConfiguringaRelayPoolforaRemoteDHCPServer 158 ConfiguringOtherTypesofRelayPools 161 ConfiguringRelayInformationforanAddressPool 161 ConfiguringMultipleRelaySourcesforaRelayPool 163 ConfigurationExamplesforDHCPEnhancementsforEdgeSessionManagement 165 DHCPAddressRangeandClassNameConfigurationExample 165 DHCPServerCo-ResidentwithSGConfigurationExample 166 DHCPRelayAgentCo-ResidentwithSGConfigurationExample 166 MultipleDHCPPoolsandDifferentISPsConfigurationExample 167 IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T viii Contents MultipleRelaySourcesandDestinationsConfigurationExample 167 SG-SuppliedClassNameConfigurationExample 167 AdditionalReferences 168 FeatureInformationforDHCPEnhancementsforEdge-SessionManagement 170 CHAPTER 8 DHCP:AutomaticIPv4AddressPoolAssignmentforDMVPNSpokes 171 FindingFeatureInformation 171 InformationAboutDHCP:AutomaticIPv4AddressPoolAssignmentforDMVPNSpokes 172 ODAPClientSupportonDMVPNSpoke 172 ODAPServerSupportonDMVPNHub 173 DHCPStaticMapping 173 NHRPSupport 174 ConfiguringDHCP:AutomaticIPv4AddressPoolAssignmentforDMVPNSpokes 174 AssigninganIPv4AddressPoolforDMPVNSpokes 174 ConfigurationExamplesforDHCP:AutomaticIPv4AddressPoolAssignmentforDMVPN Spokes 176 Example:AssigninganIPv4AddressPoolforDMVPNSpokes 176 AdditionalReferences 176 FeatureInformationforDHCP:AutomaticIPv4AddressPoolAssignmentforDMVPN Spokes 177 CHAPTER 9 DHCPv6PrefixDelegationUsingAAA 179 FindingFeatureInformation 179 InformationAboutDHCPv6PrefixDelegationUsingAAA 179 PrefixDelegation 179 DHCPSIPServerOptions 180 HowtoConfigureDHCPv6PrefixDelegationUsingAAA 180 ConfiguringDHCPv6AAAandSIPOptions 180 ConfigurationExamplesforDHCPv6PrefixDelegationUsingAAA 181 Example:ConfiguringDHCPv6AAAandSIPOptions 181 AdditionalReferences 181 FeatureInformationforDHCPv6PrefixDelegationUsingAAA 182 CHAPTER 10 DHCPv6ServerStatelessAutoconfiguration 185 FindingFeatureInformation 185 IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T ix Contents InformationAboutDHCPv6ServerStatelessAutoconfiguration 185 DHCPv6ServerStatelessAutoconfiguration 185 HowtoConfigureDHCPv6ServerStatelessAutoconfiguration 187 ConfiguringtheStatelessDHCPv6Server 187 ConfiguringtheStatelessDHCPv6Client 189 EnablingProcessingofPacketswithSourceRoutingHeaderOptions 190 ConfigurationExamplesforDHCPv6ServerStatelessAutoconfiguration 191 Example:ConfiguringtheStatelessDHCPv6Function 191 AdditionalReferencesforDHCPOverview 191 FeatureInformationforDHCPv6ServerStatelessAutoconfiguration 192 CHAPTER 11 DHCPv6RelayandServer-MPLSVPNSupport 195 FindingFeatureInformation 195 InformationAboutDHCPv6RelayandServer-MPLSVPNSupport 195 DHCPv6ServerandRelay—MPLSVPNSupport 195 HowtoConfigureDHCPv6RelayandServer-MPLSVPNSupport 196 ConfiguringaVRF-AwareRelayandServerforMPLSVPNSupport 196 ConfiguringaVRF-AwareRelay 196 ConfiguringaVRF-AwareServer 198 ConfigurationExamplesforDHCPv6Server-MPLSVPNSupport 199 Example:ConfiguringaVRF-AwareRelay 199 Example:ConfiguringaVRF-AwareServer 199 AdditionalReferences 199 FeatureInformationforDHCPv6RelayandServer-MPLSVPNSupport 200 CHAPTER 12 IPv6AccessServices:DHCPv6RelayAgent 203 FindingFeatureInformation 203 InformationAboutIPv6AccessServices:DHCPv6RelayAgent 203 DHCPv6RelayAgent 203 DHCPv6RelayAgentNotificationforPrefixDelegation 205 DHCPv6RelaySSOandISSU 205 DHCPv6RelayOptions:RemoteIDforEthernetInterfaces 206 DHCPv6RelayOptions:ReloadPersistentInterfaceIDOption 206 HowtoConfigureIPv6AccessServices:DHCPv6RelayAgent 207 ConfiguringtheDHCPv6RelayAgent 207 IP Addressing: DHCP Configuration Guide, Cisco IOS Release 15M&T x
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