IP Addressing: DHCP Configuration Guide (Cisco ASR 920 Series)

168 Pages·2017·3.34 MB·English

IP Addressing: DHCP Configuration Guide, Cisco IOS XE Release 3S
(Cisco ASR 920 Series)
FirstPublished:2014-07-29
LastModified:2014-11-22
AmericasHeadquarters
CiscoSystems,Inc.
170WestTasmanDrive
SanJose,CA95134-1706
USA
http://www.cisco.com
Tel:[phone]
800553-NETS(6387)
Fax:[phone]
©2014–2019CiscoSystems,Inc.Allrightsreserved.
CONTEN TS
CHAPTER 1 DHCPOverview 1
InformationAboutDHCP 1
DHCPOverview 1
BenefitsofUsingDHCP 2
DHCPServerRelayAgentandClientOperation 2
DHCPDatabase 3
DHCPAttributeInheritance 3
DHCPOptionsandSuboptions 4
DHCPServerOn-DemandAddressPoolManagementOverview 5
AdditionalReferencesforDHCPOverview 5
TechnicalAssistance 6
Glossary 7
CHAPTER 2 ConfiguringtheCiscoIOSXEDHCPServer 9
PrerequisitesforConfiguringtheDHCPServer 9
InformationAbouttheCiscoIOSXEDHCPServer 10
OverviewoftheDHCPServer 10
DatabaseAgents 10
AddressConflicts 10
DHCPAddressPoolConventions 10
DHCPAddressPoolSelection 10
AddressBindings 11
PingPacketSettings 11
DHCPAttributeInheritance 11
DHCPServerAddressAllocationUsingOption82 12
DHCPAddressAllocationUsingOption82FeatureDesign 13
IPAddressing:DHCPConfigurationGuide,CiscoIOSXERelease3S(CiscoASR920Series)
iii
Contents
UsageScenarioforDHCPAddressAllocationUsingOption82 13
DHCPClassCapability 14
HowtoConfiguretheCiscoIOSXEDHCPServer 15
ConfiguringaDHCPDatabaseAgentorDisablingConflictLogging 15
ExcludingIPAddresses 16
ConfiguringDHCPAddressPools 17
ConfiguringaDHCPAddressPool 17
ConfiguringaDHCPAddressPoolwithSecondarySubnets 21
TroubleshootingTips 25
VerifyingtheDHCPAddressPoolConfiguration 26
ConfiguringManualBindings 27
TroubleshootingTips 29
ConfiguringDHCPStaticMapping 30
ConfiguringtheDHCPServertoReadaStaticMappingTextFile 31
CustomizingDHCPServerOperation 33
ConfiguringaRemoteDevicetoImportDHCPServerOptionsfromaCentralDHCPServer 35
ConfiguringtheCentralDHCPServertoUpdateDHCPOptions 35
ConfiguringtheRemoteDevicetoImportDHCPOptions 36
ConfiguringDHCPAddressAllocationUsingOption82 37
RestrictionsforDHCPAddressAllocationUsingOption82 37
EnablingOption82forDHCPAddressAllocation 38
TroubleshootingTips 38
DefiningtheDHCPClassandRelayAgentInformationPatterns 38
TroubleshootingTips 40
DefiningtheDHCPAddressPool 40
ConfiguringaStaticRoutewiththeNext-HopDynamicallyObtainedThroughDHCP 41
ClearingDHCPServerVariables 42
ConfigurationExamplesfortheCiscoIOSXEDHCPServer 43
Example:ConfiguringtheDHCPDatabaseAgent 43
Example:ExcludingIPAddresses 43
Example:ConfiguringDHCPAddressPools 44
Example:ConfiguringaDHCPAddressPoolwithMultipleDisjointSubnets 45
ConfiguringManualBindingsExample 47
Example:ConfiguringStaticMapping 47
IPAddressing:DHCPConfigurationGuide,CiscoIOSXERelease3S(CiscoASR920Series)
iv
Contents
ImportingDHCPOptionsExample 48
ConfiguringDHCPAddressAllocationUsingOption82Example 49
ConfiguringaStaticRoutewiththeNext-HopDynamicallyObtainedThroughDHCPExample 49
AdditionalReferences 50
FeatureInformationfortheCiscoIOSXEDHCPServer 51
CHAPTER 3 ConfiguringtheCiscoIOSXEDHCPClient 53
FeatureInformationfortheCiscoIOSXEDHCPClient 53
InformationAbouttheDHCPClient 54
DHCPClientOperation 54
DHCPClientOverview 55
HowtoConfiguretheDHCPClient 56
ConfiguringtheDHCPClient 56
TroubleshootingTips 57
ConfigureAdministrativeDistance 57
ConfigurationExamplesfortheDHCPClient 58
ConfiguringtheDHCPClientExample 58
CustomizingtheDHCPClientConfigurationExample 58
Example:ConfiguringtheDHCPClientinUnicastMode 59
AdditionalReferences 60
TechnicalAssistance 61
CHAPTER 4 ImplementingDHCPforIPv6 63
DHCPv6PrefixDelegation 63
ConfiguringNodesWithoutPrefixDelegation 63
ClientandServerIdentification 64
RapidCommit 64
DHCPv6ClientandRelayFunctions 64
ClientFunction 64
DHCPv6RelayAgent 65
DHCPv6RelaySSOandISSU 66
HowtoImplementDHCPforIPv6 68
ConfiguringtheDHCPv6ServerFunction 68
ConfiguringtheDHCPv6ConfigurationPool 68
IPAddressing:DHCPConfigurationGuide,CiscoIOSXERelease3S(CiscoASR920Series)
v
Contents
ConfiguringaBindingDatabaseAgentfortheServerFunction 70
ConfiguringtheDHCPv6ClientFunction 71
ConfiguringtheDHCPv6RelayAgent 72
ConfiguringRouteAdditionforRelayandServer 73
DefiningaGeneralPrefixwiththeDHCPv6PrefixDelegationClientFunction 73
ConfiguringaVRF-AwareRelayforMPLSVPNSupport 74
ConfiguringaVRF-AwareRelay 74
RestartingtheDHCPv6ClientonanInterface 75
DeletingAutomaticClientBindingsfromtheDHCPv6BindingTable 76
TroubleshootingDHCPv6 76
VerifyingtheDHCPv6Configuration 77
ExampleVerifyingtheDHCPv6Configuration 77
ConfigurationExamplesforImplementingDHCPv6 80
Example:ConfiguringtheDHCPv6ClientFunction 80
CHAPTER 5 IPv6AccessServices:DHCPv6RelayAgent 81
InformationAboutIPv6AccessServices:DHCPv6RelayAgent 81
DHCPv6RelayAgent 81
DHCPv6RelayAgentNotificationforPrefixDelegation 83
DHCPv6RelayOptions:RemoteIDforEthernetInterfaces 83
DHCPv6RelayOptions:ReloadPersistentInterfaceIDOption 83
DHCPv6RelayChaining 84
HowtoConfigureIPv6AccessServices:DHCPv6RelayAgent 84
ConfiguringtheDHCPv6RelayAgent 84
ConfigurationExamplesforIPv6AccessServices:DHCPv6RelayAgent 85
Example:ConfiguringtheDHCPv6RelayAgent 85
AdditionalReferences 85
FeatureInformationforIPv6AccessServices:DHCPv6RelayAgent 86
CHAPTER 6 IPv6AccessServices:DHCPv6PrefixDelegation 87
RestrictionsforIPv6AccessServices:DHCPv6PrefixDelegation 87
InformationAboutIPv6AccessServices:DHCPv6PrefixDelegation 87
DHCPv6PrefixDelegation 87
ConfiguringNodesWithoutPrefixDelegation 88
IPAddressing:DHCPConfigurationGuide,CiscoIOSXERelease3S(CiscoASR920Series)
vi
Contents
ClientandServerIdentification 88
RapidCommit 88
DHCPv6Client,Server,andRelayFunctions 88
HowtoConfigureIPv6AccessServices:DHCPv6PrefixDelegation 93
ConfiguringtheDHCPv6ServerFunction 93
ConfiguringtheDHCPv6ConfigurationPool 93
ConfiguringaBindingDatabaseAgentfortheServerFunction 96
ConfiguringtheDHCPv6ClientFunction 96
DeletingAutomaticClientBindingsfromtheDHCPv6BindingTable 98
RemovingPreviously-AcquiredPrefixes 98
DebuggingDHCPv6BindingDatabase 98
ConfigurationExamplesforIPv6AccessServices:DHCPv6PrefixDelegation 99
Example:ConfiguringtheDHCPv6ServerFunction 99
Example:ConfiguringtheDHCPv6ConfigurationPool 100
Example:ConfiguringtheDHCPv6ClientFunction 101
Example:ConfiguringaDatabaseAgentfortheServerFunction 102
Example:DisplayingDHCPServerandClientInformationontheInterface 102
Example:DebuggingDHCPv6 103
AdditionalReferences 106
FeatureInformationforIPv6AccessServices:DHCPv6PrefixDelegation 107
CHAPTER 7 ConfiguringDHCPFeatures 109
LimitationsandRestrictions 109
DHCPFeatures 109
DHCPServer 109
DHCPRelayAgent 110
DHCPSnooping 110
Option-82DataInsertion 111
CiscoIOSDHCPServerDatabase 114
DHCPSnoopingBindingDatabase 114
ConfiguringDHCPFeatures 116
DefaultDHCPConfiguration 116
DHCPSnoopingConfigurationGuidelines 117
ConfiguringtheDHCPServer 118
IPAddressing:DHCPConfigurationGuide,CiscoIOSXERelease3S(CiscoASR920Series)
vii
Contents
ConfiguringtheDHCPRelayAgent 118
SpecifyingthePacketForwardingAddress 118
EnablingDHCPSnoopingandOption82 119
EnablingtheCiscoIOSDHCPServerDatabase 121
EnablingtheDHCPSnoopingBindingDatabaseAgent 121
StoppingtheDatabaseAgentandBindingfiles 122
ClearingtheStatisticsoftheDHCPSnoopingBindingDatabaseAgent 122
DeletingBindingEntriesfromtheDHCPSnoopingBindingDatabase 122
DisablingDHCPSnooping 123
DisplayingDHCPSnoopingInformation 123
Pre-assignedAddressReservedintheDHCPPool 123
AutomaticGenerationofSubscriberIdentifier 124
AdditionalReferences 124
FeatureInformationforConfiguringDHCPFeatures 125
CHAPTER 8 ConfiguringDynamicARPInspection 127
DynamicARPInspection 127
InterfaceTrustStatesandNetworkSecurity 129
RateLimitingofARPPackets 130
RelativePriorityofARPACLsandDHCPSnoopingEntries 130
LoggingofDroppedPackets 130
ConfiguringDynamicARPInspection 130
DefaultDynamicARPInspectionConfiguration 130
DynamicARPInspectionConfigurationGuidelines 131
ConfiguringDynamicARPInspectioninDHCPEnvironments 132
ExampleforConfiguringDynamicARPInspection 134
DisablingDynamicARPInspection 134
ConfiguringARPACLsforNon-DHCPEnvironments 134
ExampleforConfiguringanARPACL 136
RemovingtheARPACL 136
LimitingtheRateofIncomingARPPackets(optional) 136
PerformingValidationChecks(optional) 138
ConfiguringtheLogBuffer(optional) 139
ReturningtotheDefaultLogBufferSettings 141
IPAddressing:DHCPConfigurationGuide,CiscoIOSXERelease3S(CiscoASR920Series)
viii
Contents
DisplayingDynamicARPInspectionInformation 142
ClearingorDisplayingDynamicARPInspectionStatistics 142
ClearingorDisplayingDynamicARPInspectionLoggingInformation 142
AdditionalReferences 143
FeatureInformationforConfiguringDynamicARP 144
IPAddressing:DHCPConfigurationGuide,CiscoIOSXERelease3S(CiscoASR920Series)
ix
Contents
IPAddressing:DHCPConfigurationGuide,CiscoIOSXERelease3S(CiscoASR920Series)
x