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Cisco Systems 32369 ip dhcp relay information check, Syntax Description, Defaults, Command Modes

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Command Reference

ip dhcp relay information check

To conﬁgure a Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server to validate the relay agent information option in forwarded BOOTREPLY messages, use the ip dhcp relay information check global conﬁguration command. Use the no form of this command to disable an information check.

ip dhcp relay information check

no ip dhcp relay information check

Syntax Description

This command has no arguments or keywords.

Defaults

The DHCP server checks relay information. Invalid messages are dropped.

Command Modes

Global conﬁguration

Usage Guidelines

This command ﬁrst appeared in Cisco IOS Release 12.0(1)T.

This command is used by cable modem termination systems. By default, DHCP checks relay information. Invalid messages are dropped.

Examples

The following example conﬁgures the DHCP server to check that the relay agent information option in forwarded BOOTREPLY messages is valid:

ip dhcp relay information check

Related Commands

ip dhcp relay information option ip dhcp relay information policy

32Release 12.0(1)T

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Cisco Systems 32369 ip dhcp relay information check no ip dhcp relay information check, Syntax Description, Defaults

Contents

Feature Overview Cisco IOS DHCP ServerBeneﬁts Supported PlatformsRFC 951, Bootstrap Protocol BOOTP RFC 1542, Clariﬁcations and Extensions for the Bootstrap ProtocolRFC 2132, DHCP Options and BOOTP Vendor Extensions Supported Standards, MIBs, and RFCsPrerequisites DHCP Conﬁguration Task ListConﬁguring a DHCP Database Agent or Disabling DHCP Conﬂict Logging Excluding IP AddressesConﬁguring a DHCP Address Pool timeout seconds write-delay secondsConﬁguring the DHCP Address Pool Subnet and Mask Conﬁguring the Domain Name for the ClientConﬁguring the Domain Name System IP Servers for the Client 6 Release 12.01TConﬁguring the NetBIOS Node Type for the Client Conﬁguring the Default Router for the ClientConﬁguring Manual Bindings Conﬁguring the Address Lease Time8 Release 12.01T Configuring a DHCP Server Boot FileConﬁguring the Number of Ping Packets Monitoring and Maintaining the DHCP Server Conﬁguring the Timeout Value for Ping PacketsEnabling the Cisco IOS DHCP Server Feature DHCP Address Pool Conﬁguration Example Conﬁguration ExamplesDHCP Database Agent Conﬁguration Example Manual Bindings Conﬁguration Example Manual Bindings Configuration ExampleCommand Reference bootﬁle clear ip dhcp binding clear ip dhcp conﬂictdefault-router dns-server domain-name hardware-address host ip dhcp ping packets ip dhcp ping timeout ip dhcp poolcommand begin include exclude regular-expression show atm vc begin PeakRatebootﬁle DefaultsCommand Modes Related Commandsclear ip dhcp binding clear ip dhcp binding addressaddress Clears all automatic bindingsclear ip dhcp conﬂict clear ip dhcp conﬂict addresswant to clear Clears all address conﬂictsclear ip dhcp server statistics clear ip dhcp server statisticsCommand Modes Related Commandsclient-identiﬁer client-identiﬁer unique-identiﬁer no client-identiﬁerunique-identiﬁer hardware-address host ip dhcp poolclient-name client-name name no client-namename client name should not include the domain name. For example, thedefault-router default-router address address2 ... address8no default-router Speciﬁes the IP address of a router. One IP address is requireddns-server dns-server address address2 ... address8no dns-server Speciﬁes the IP address of a DNS server. One IP address is requireddomain-name domain-name domain no domain-namedomain dns-server ip dhcp poolhardware-address hardware-address hardware-address typeno hardware-address hardware-addresshost host address mask /preﬁx-lengthno host Speciﬁes the IP address of the clientip dhcp conﬂict logging Exampleip dhcp conﬂict logging no ip dhcp conﬂict logging clear ip dhcp conﬂict ip dhcp database show ip dhcp conﬂictsip dhcp database url timeout seconds write-delay seconds timeout secondstimeout period are aborted. By default, DHCP waits 300 seconds updates. By default, DHCP waits 300 seconds 5 minutes beforeshow ip dhcp database Related Commandsip dhcp database Cisco IOS DHCP Serverip dhcp excluded-address ip dhcp excluded-address low-address high-addressno ip dhcp excluded-address low-address high-address low-addressaddress to a requesting client. The default value is two packets clear ip dhcp conﬂicts ip dhcp ping timeout show ip dhcp conﬂictsip dhcp ping packets ip dhcp ping packets count no ip dhcp ping packetsip dhcp ping timeout ip dhcp ping timeout milliseconds no ip dhcp ping timeoutassignment. The maximum timeout is 10000 milliseconds 10 seconds. The default timeout is 500 millisecondsip dhcp pool ip dhcp pool name no ip dhcp pool namesuch as host ip dhcp excluded-address network DHCPip dhcp relay information check ip dhcp relay information check no ip dhcp relay information checkip dhcp relay information option ip dhcp relay information policy Defaultsip dhcp relay information option ip dhcp relay information option no ip dhcp relay information optionip dhcp relay information check ip dhcp relay information policy Defaultsip dhcp relay information policy ip dhcp relay information policy drop keep replaceno ip dhcp relay information policy droplease lease days hoursminutes inﬁniteno lease daysnetbios-name-server netbios-name-server address address2...address8no netbios-name-server Speciﬁes the IP address of the NetBIOS WINS name servernetbios-node-type netbios-node-type type no netbios-node-typeip dhcp pool netbios-name-server Defaultsnetwork DHCP network network-number mask /preﬁx-lengthno network network-numberone command line bootﬁle ip dhcp pool ip helper-address optionnext-server next-server address address2...address8option option code instance number ascii string hex string ip addressno option code instance number codeRelated Commands ip dhcp pooloption Cisco IOS DHCP Serverservice dhcp service dhcp no service dhcpDefaults Command Modesshow ip dhcp binding show ip dhcp binding addressOptional Speciﬁes the IP address of the DHCP client for which bindings will be displayedclear ip dhcp binding Related CommandsCommand Reference 44 Release 12.01Tclear ip dhcp conﬂict ip dhcp ping packets ip dhcp ping timeout show ip dhcp conﬂictshow ip dhcp conﬂict address Defaultsshow ip dhcp database show ip dhcp database urlDefaults Command Modesip dhcp database Related Commandsshow ip dhcp database show ip dhcp database Field Descriptions continuedshow ip dhcp server statistics DefaultsCommand Modes Syntax DescriptionRelated Commands clear ip dhcp server statisticsshow ip dhcp server statistics show ip dhcp server statistics Field DescriptionsDebug Commands debug ip dhcp serverDebug Commands 50 Release 12.01Tdebug ip dhcp server eventspackets linkageGlossary