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Cisco IOS DHCP Server 1
Cisco IOS DHCP Server
Feature Overview
Dynamic Host Control Protocol (DHCP) enables you to automatically assign reusable IP addresses
to DHCP clients. The Cisco IOS DHCP Server feature is a full DHCP server implementation that
assigns and manages IP addresses from specified address pools within the router to DHCP clients.
If the Cisco IOS DHCP Server cannot satisfy a DHCP request from its own database, it can forward
the request to one or more secondary DHCP servers defined by the network administrator.
Figure 1 shows the basic steps that occur when a DHCP client requests an IP address from a DHCP
server. The client, Host A, sends a DHCPDISCOVER broadcast message to locate a Cisco IOS
DHCP Server. A DHCP server offers configuration parameters (such as an IP address, a MAC
address, a domain name, and a lease for the IP address) to the client in a DHSCPOFFER unicast
message.
Figure 1 DHCP Request for an IP Address from a DHCP Server
Note A DHCP client may receive offers from multiple DHCP servers and can accept any one of the
offers; however, the client usually accepts the first offer it receives. Additionally, the offer from the
DHCP server is not a guarantee that the IP address will be allocated to the client; however, the server
usually reserves the address until the client has had a chance to formally request the address.
The client returns a formal request for the offered IP address to the DHCP server in a
DHCPREQUEST broadcast message. The DHCP server confirms that the IP address has been
allocated to the client by returning a DHCPACK unicast message to the client.
Host A
DHCPACK (unicast)
DHCPREQUEST (broadcast)
DHCPOFFER (unicast)
DHCPDISCOVER (broadcast)
Cisco IOS
DHCP server
32369
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Inhaltsverzeichnis

Seite 1 - Cisco IOS DHCP Server

Cisco IOS DHCP Server 1Cisco IOS DHCP ServerFeature OverviewDynamic Host Control Protocol (DHCP) enables you to automatically assign reusable IP addr

Seite 2 - Supported Platforms

Configuration Examples10Release 12.0(1)TTo display DHCP server information, use the following commands in EXEC mode, as needed:Configuration ExamplesTh

Seite 3 - Standards

Manual Bindings Configuration Example Cisco IOS DHCP Server 11ip dhcp database ftp://user:[email protected]/router-dhcp write-delay 120ip dhcp exc

Seite 4 - DHCP Configuration Task List

Command Reference12Release 12.0(1)TCommand ReferenceThis section documents new or modified commands. All other commands used with this feature aredocum

Seite 5 - Excluding IP Addresses

Manual Bindings Configuration Example Cisco IOS DHCP Server 13In Cisco IOS Release 12.0(1)T or later, you can search and filter the output for show and

Seite 6

Command Reference14Release 12.0(1)TbootfileTo specify the name of the default boot image for a Dynamic Host Configuration Protocol (DHCP)client, use th

Seite 7 - Configuring Manual Bindings

clear ip dhcp binding Cisco IOS DHCP Server 15clear ip dhcp bindingTo delete an automatic address binding from the Cisco IOS Dynamic Host Configuratio

Seite 8

Command Reference16Release 12.0(1)Tclear ip dhcp conflictTo clear an address conflict from the Cisco IOS Dynamic Host Configuration Protocol (DHCP)Serve

Seite 9

clear ip dhcp server statistics Cisco IOS DHCP Server 17clear ip dhcp server statisticsTo reset all Cisco IOS Dynamic Host Configuration Protocol (DHC

Seite 10 - Configuration Examples

Command Reference18Release 12.0(1)Tclient-identifierTo specify a Microsoft Dynamic Host Configuration Protocol (DHCP) client’s unique identifier(in dott

Seite 11 - Cisco IOS DHCP Server 11

client-name Cisco IOS DHCP Server 19client-nameTo specify the name of a Dynamic Host Configuration Protocol (DHCP) client, use theclient-name DHCP poo

Seite 12 - Command Reference

Benefits2Release 12.0(1)TNote The formal request for the offered IP address (the DHCPREQUEST message) that is sent bythe client is broadcast so that a

Seite 13 - Cisco IOS DHCP Server 13

Command Reference20Release 12.0(1)Tdefault-routerTo specify the default router list for a Dynamic Host Configuration Protocol (DHCP) client, usethe de

Seite 14 - Release 12.0(1)T

dns-server Cisco IOS DHCP Server 21dns-serverTo specify the Domain Name System (DNS) IP servers available to a Dynamic Host ConfigurationProtocol (DHC

Seite 15 - Usage Guidelines

Command Reference22Release 12.0(1)Tdomain-nameTo specify the domain name for a Dynamic Host Configuration Protocol (DHCP) client, use thedomain-name D

Seite 16

hardware-address Cisco IOS DHCP Server 23hardware-addressTo specify the hardware address of a Dynamic Host Configuration Protocol (DHCP) client, useth

Seite 17

Command Reference24Release 12.0(1)ThostTo specify the IP address and network mask for a manual binding to a Dynamic Host ConfigurationProtocol (DHCP)

Seite 18

ip dhcp conflict logging Cisco IOS DHCP Server 25ip dhcp conflict loggingTo enable conflict logging on a Cisco IOS Dynamic Host Configuration Protocol (

Seite 19 - Cisco IOS DHCP Server 19

Command Reference26Release 12.0(1)Tip dhcp databaseYou can configure a Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server to saveautomatic bin

Seite 20

ip dhcp database Cisco IOS DHCP Server 27Related Commandsshow ip dhcp database

Seite 21 - Cisco IOS DHCP Server 21

Command Reference28Release 12.0(1)Tip dhcp excluded-addressTo specify IP addresses that a Cisco IOS Dynamic Host Configuration Protocol (DHCP) Servers

Seite 22

ip dhcp ping packets Cisco IOS DHCP Server 29ip dhcp ping packetsTo specify the number of packets a Cisco IOS Dynamic Host Configuration Protocol (DHC

Seite 23

Cisco IOS DHCP Server 3• Cisco MC3810 series• Cisco 4000 series• Cisco AS5100 access server• Cisco AS5200 universal access server• Cisco AS5300 unive

Seite 24 - /prefix-length]

Command Reference30Release 12.0(1)Tip dhcp ping timeoutTo specify how long a Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server waits fora pi

Seite 25 - Cisco IOS DHCP Server 25

ip dhcp pool Cisco IOS DHCP Server 31ip dhcp poolTo configure a Dynamic Host Configuration Protocol (DHCP) address pool on a Cisco IOS DHCPServer and e

Seite 26 - Defaults

Command Reference32Release 12.0(1)Tip dhcp relay information checkTo configure a Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server to validat

Seite 27

ip dhcp relay information option Cisco IOS DHCP Server 33ip dhcp relay information optionTo configure a Cisco IOS Dynamic Host Configuration Protocol (

Seite 28

Command Reference34Release 12.0(1)Tip dhcp relay information policyTo configure a Dynamic Host Configuration Protocol (DHCP) relay agent’s informationr

Seite 29 - Cisco IOS DHCP Server 29

lease Cisco IOS DHCP Server 35leaseTo configure the duration of the lease for an IP address that is assigned from a Cisco IOS DynamicHost Configuration

Seite 30

Command Reference36Release 12.0(1)Tnetbios-name-serverTo configure NetBIOS Windows Internet Naming Service (WINS) name servers that are availableto Mic

Seite 31 - Cisco IOS DHCP Server 31

netbios-node-type Cisco IOS DHCP Server 37netbios-node-typeTo configure the NetBIOS node type for Microsoft Dynamic Host Configuration Protocol (DHCP)c

Seite 32

Command Reference38Release 12.0(1)Tnetwork (DHCP)To configure the subnet number and mask for a Dynamic Host Configuration Protocol (DHCP)address pool o

Seite 33 - Cisco IOS DHCP Server 33

next-server Cisco IOS DHCP Server 39next-serverTo configure the next server in a Dynamic Host Configuration Protocol (DHCP) client’s bootprocess, use t

Seite 34

Prerequisites4Release 12.0(1)TPrerequisitesBefore you configure the Cisco IOS DHCP Server feature, complete the following tasks:• Identify an external

Seite 35 - Cisco IOS DHCP Server 35

Command Reference40Release 12.0(1)ToptionTo configure Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server options, use theoption DHCP pool confi

Seite 36

option Cisco IOS DHCP Server 41Related Commandsip dhcp pool

Seite 37

Command Reference42Release 12.0(1)Tservice dhcpTo enable the Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server feature on yourrouter, use th

Seite 38

show ip dhcp binding Cisco IOS DHCP Server 43show ip dhcp bindingTo display address bindings on the Cisco IOS Dynamic Host Configuration Protocol (DHC

Seite 39 - Cisco IOS DHCP Server 39

Command Reference44Release 12.0(1)TRelated Commandsclear ip dhcp binding

Seite 40

show ip dhcp conflict Cisco IOS DHCP Server 45show ip dhcp conflictTo display address conflicts found by a Cisco IOS Dynamic Host Configuration Protocol

Seite 41

Command Reference46Release 12.0(1)Tshow ip dhcp databaseTo display Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server database agentinformati

Seite 42

show ip dhcp database Cisco IOS DHCP Server 47Related Commandsip dhcp databaseRead The last time bindings were read from the file server.Written The la

Seite 43

Command Reference48Release 12.0(1)Tshow ip dhcp server statisticsTo display Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server statistics, us

Seite 44

show ip dhcp server statistics Cisco IOS DHCP Server 49Related Commandsclear ip dhcp server statisticsTable 5 show ip dhcp server statistics Field Des

Seite 45

Configuring a DHCP Database Agent or Disabling DHCP Conflict Logging Cisco IOS DHCP Server 5Configuring a DHCP Database Agent or Disabling DHCP Conflict

Seite 46

Debug Commands50Release 12.0(1)TDebug CommandsThis section describes the following new debug command:• debug ip dhcp server

Seite 47

debug ip dhcp server Cisco IOS DHCP Server 51debug ip dhcp serverTo enable Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server debugging, use

Seite 48

Glossary52Release 12.0(1)TGlossaryaddress binding—A mapping between the client’s IP and hardware (MAC) addresses. The client’sIP address may be configu

Seite 49

DHCP Configuration Task List6Release 12.0(1)TConfiguring the DHCP Address Pool Subnet and MaskTo configure a subnet and mask for the newly created DHCP

Seite 50 - Debug Commands

Configuring the NetBIOS Node Type for the Client Cisco IOS DHCP Server 7Configuring the NetBIOS Node Type for the ClientThe NetBIOS node type for Micro

Seite 51

DHCP Configuration Task List8Release 12.0(1)TTo configure manual bindings, use the following commands beginning in global configuration mode:Configuring

Seite 52 - Glossary

Configuring the Timeout Value for Ping Packets Cisco IOS DHCP Server 9Configuring the Timeout Value for Ping PacketsBy default, the DHCP server waits 5

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