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Cisco Systems 32369 manual

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Table of contents for the manual

  • Page 1

    Cisco IOS DHCP Server 1 Cisco IOS DHCP Ser v er 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 serv er implementation that assigns and manages IP addresses from specified address pools within the router to DHCP clients[...]

  • Page 2

    Benefits 2 Release 12.0(1)T Note The formal request for the offered IP address (the DHCPREQ UEST message) that is sent by the client is broadcast so that all other DHCP servers that recei v ed the DHCPDISCO VER broadcast message from the client can reclaim the IP addresses that they of fered to the client. If the configuration parameters sent to t[...]

  • Page 3

    Cisco IOS DHCP Server 3 • Cisco MC3810 series • Cisco 4000 series • Cisco AS5100 access server • Cisco AS5200 uni versal access serv er • Cisco AS5300 uni versal access serv er • Cisco 7000 series • Cisco 7100 series • Cisco 7200 series • Cisco MGX 8800 with an installed Route Processor Module • Cisco 12000 series • Cisco uBR9[...]

  • Page 4

    Prerequisites 4 Release 12.0(1)T Prerequisites Before you configure the Cisco IOS DHCP Server feature, complete the follo wing tasks: • Identify an external File T ransport Protocol (FTP), Tri vial File T ransfer Protocol (TFTP), or remote copy protocol (rcp) server that you will use to store the DHCP bindings database. • Identify the IP addre[...]

  • Page 5

    Configuring a DHCP Database Agent or Disabling DHCP Conflict Logging Cisco IOS DHCP Server 5 Configuring a DHCP Database Agent or Disabling DHCP Conflict Logging A DHCP database agent is an y host, for example, an FTP , TFTP , or RCP server that stores the DHCP bindings database. Y ou can configure multiple DHCP database agents and you can con?[...]

  • Page 6

    DHCP Configuration Task List 6 Release 12.0(1)T Configuring the DHCP Address P ool Subnet and Mask T o configure a subnet and mask for the ne wly created DHCP address pool, which contains the range of av ailable IP addresses that the DHCP server may assign to clients, use the following command in DHCP pool configuration mode: Note Y ou can not c[...]

  • Page 7

    Configuring the NetBIOS Node Type for the Client Cisco IOS DHCP Server 7 Configuring the NetBIOS Node T ype f or the Client The NetBIOS node type for Microsoft DHCP clients can be one of four settings: broadcast, peer-to-peer , mixed, or hybrid. T o configure the NetBIOS node type for a Microsoft DHCP , use the following command in DHCP pool con?[...]

  • Page 8

    DHCP Configuration Task List 8 Release 12.0(1)T T o configure manual bindings, use the follo wing commands beginning in global configuration mode: Configuring a DHCP Server Boot File The boot file is used to store the boot image for the client. The boot image is generally the operating system the client uses to load. T o specify a boot file for[...]

  • Page 9

    Configuring the Timeout Value for Ping Packets Cisco IOS DHCP Server 9 Configuring the Timeout V alue for Ping P ac kets By default, the DHCP server w aits 500 milliseconds before timing out a ping packet. T o change the amount of time the server waits, use the follo wing command in global configuration mode: Enabling the Cisco IOS DHCP Server Fe[...]

  • Page 10

    Configuration Examples 10 Release 12.0(1)T T o display DHCP serv er information, use the following commands in EXEC mode, as needed: Configuration Examples This section provides the follo wing configuration e xamples: • DHCP Database Agent Configuration Example • DHCP Address Pool Configuration Example • Manual Bindings Configuration Exa[...]

  • Page 11

    Manual Bindings Configuration Example Cisco IOS DHCP Server 11 ip dhcp database ftp://user:password@172.16.4.253/router-dhcp write-delay 120 ip dhcp excluded-address 172.16.1.100 172.16.1.103 ip dhcp excluded-address 172.16.2.100 172.16.2.103 ! ip dhcp pool 0 network 172.16.0.0 /16 domain-name cisco.com dns-server 172.16.1.102 172.16.2.102 netbios-[...]

  • Page 12

    Command Reference 12 Release 12.0(1)T Command Reference This section documents ne w or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command reference publications. • bootfile • clear ip dhcp binding • clear ip dhcp conflict • clear ip dhcp server statistics • client-identifi[...]

  • Page 13

    Manual Bindings Configuration Example Cisco IOS DHCP Server 13 In Cisco IOS Release 12.0(1)T or later , you can search and filter the output for show and more commands. This functionality is useful when you need to sort through large amounts of output, or if you want to exclude output that you do not need to see. T o use this functionality , enter[...]

  • Page 14

    Command Reference 14 Release 12.0(1)T bootfile T o specify the name of the default boot image for a Dynamic Host Conf iguration Protocol (DHCP) client, use the bootfile DHCP pool configuration command. Use the no form of this command to delete the boot image name. bootfile filename no bootfile Syntax Description Def aults No default beha vior[...]

  • Page 15

    clear ip dhcp binding Cisco IOS DHCP Server 15 c lear ip dhcp binding T o delete an automatic address binding from the Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server database, use the clear ip dhcp binding privile ged EXEC command. clear ip dhcp binding addr ess | * Syntax Description Command Modes Privile ged EXEC Usage Guidelines T [...]

  • Page 16

    Command Reference 16 Release 12.0(1)T c lear ip dhcp conflict T o clear an address conflict from the Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server database, use the clear ip dhcp conflict privile ged EXEC command. clear ip dhcp conflict addr ess | * Syntax Description Command Modes Privile ged EXEC Usage Guidelines This command ?[...]

  • Page 17

    clear ip dhcp server statistics Cisco IOS DHCP Server 17 c lear ip dhcp server statistics T o reset all Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server counters, use the clear ip dhcp server statistics privile ged EXEC command. clear ip dhcp server statistics Syntax Description This command has no ar guments or ke ywords. Command Modes[...]

  • Page 18

    Command Reference 18 Release 12.0(1)T c lient-identifier T o specify a Microsoft Dynamic Host Conf iguration Protocol (DHCP) client’ s unique identifier (in dotted-hexadecimal notation), use the client-identifier DHCP pool configuration command. It is valid for manual bindings only . Use the no form of this command to delete the client identi[...]

  • Page 19

    client-name Cisco IOS DHCP Server 19 c lient-name T o specify the name of a Dynamic Host Conf iguration Protocol (DHCP) client, use the client-name DHCP pool configuration command. The client name should not include the domain name. Use the no form of this command to remov e the client name. client-name name no client-name Syntax Description Def a[...]

  • Page 20

    Command Reference 20 Release 12.0(1)T default-r outer T o specify the default router list for a Dynamic Host Conf iguration Protocol (DHCP) client, use the default-router DHCP pool configuration command. Use the no form of this command to remov e the default router list. default-router addr ess [ address2 ... addr ess8 ] no default-router Syntax D[...]

  • Page 21

    dns-server Cisco IOS DHCP Server 21 dns-server T o specify the Domain Name System (DNS) IP servers a v ailable to a Dynamic Host Conf iguration Protocol (DHCP) client, use the dns-server DHCP pool configuration command. Use the no form of this command to remov e the DNS server list. dns-server addr ess [ address2 ... addr ess8 ] no dns-server Synt[...]

  • Page 22

    Command Reference 22 Release 12.0(1)T domain-name T o specify the domain name for a Dynamic Host Conf iguration Protocol (DHCP) client, use the domain-name DHCP pool configuration command. Use the no form of this command to remove the domain name. domain-name domain no domain-name Syntax Description Def aults None. Command Modes DHCP pool configu[...]

  • Page 23

    hardware-address Cisco IOS DHCP Server 23 har d ware-address T o specify the hardware address of a Dynamic Host Conf iguration Protocol (DHCP) client, use the hardwar e-address DHCP pool configuration command. It is v alid for manual bindings only . Use the no form of this command to remov e the hardware address. hardwar e-address har dwar e-addr [...]

  • Page 24

    Command Reference 24 Release 12.0(1)T host T o specify the IP address and network mask for a manual binding to a Dynamic Host Conf iguration Protocol (DHCP) client, use the host DHCP pool configuration command. Use the no form of this command to remov e the client’ s IP address. host addr ess [ mask | / prefix-length ] no host Syntax Descriptio[...]

  • Page 25

    ip dhcp conflict logging Cisco IOS DHCP Server 25 ip dhcp conflict logging T o enable conflict logging on a Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server , use the ip dhcp conflict logging global configuration command. Use the no form of this command to disable conflict logging. ip dhcp conflict logging no ip dhcp conflict log[...]

  • Page 26

    Command Reference 26 Release 12.0(1)T ip dhcp database Y ou can configure a Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server to sav e automatic bindings on a remote host called a database agent. T o configure a DHCP serv er database agent and database agent parameters, use the ip dhcp database global configuration command. Use the no[...]

  • Page 27

    ip dhcp database Cisco IOS DHCP Server 27 Related Commands show ip dhcp database[...]

  • Page 28

    Command Reference 28 Release 12.0(1)T ip dhcp exc luded-address T o specify IP addresses that a Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server should not assign to DHCP clients, use the ip dhcp excluded-address global configuration command. Use the no form of this command to remov e the excluded IP addresses. ip dhcp excluded-address[...]

  • Page 29

    ip dhcp ping packets Cisco IOS DHCP Server 29 ip dhcp ping pac kets T o specify the number of packets a Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server sends to a pool address as part of a ping operation, use the ip dhcp ping packets global configuration command. Use the no form of this command to prev ent the server from pinging pool[...]

  • Page 30

    Command Reference 30 Release 12.0(1)T ip dhcp ping timeout T o specify ho w long a Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server w aits for a ping reply from an address pool, use the ip dhcp ping timeout global configuration command. Use the no form of this command to restore the default number of milliseconds (500) of the timeout. [...]

  • Page 31

    ip dhcp pool Cisco IOS DHCP Server 31 ip dhcp pool T o configure a Dynamic Host Conf iguration Protocol (DHCP) address pool on a Cisco IOS DHCP Server and enter DHCP pool configuration mode, use the ip dhcp pool global configuration command. Use the no form of this command to remov e the address pool. ip dhcp pool name no ip dhcp pool name Synta[...]

  • Page 32

    Command Reference 32 Release 12.0(1)T ip dhcp rela y inf ormation chec k T o configure a Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server to v alidate the relay agent information option in forwarded BOO TREPL Y messages, use the ip dhcp relay information check global configuration command. Use the no form of this command to disable an[...]

  • Page 33

    ip dhcp relay information option Cisco IOS DHCP Server 33 ip dhcp rela y inf ormation option T o configure a Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server to insert the DHCP relay agent information option in forwarded BOO TREQUEST messages, use the ip dhcp relay inf ormation option global configuration command. Use the no form of t[...]

  • Page 34

    Command Reference 34 Release 12.0(1)T ip dhcp rela y inf ormation policy T o configure a Dynamic Host Conf iguration Protocol (DHCP) relay agent’ s information reforwarding policy (what a DHCP relay agent should do if a message already contains relay information), use the ip dhcp relay inf ormation policy global configuration command. Use the n[...]

  • Page 35

    lease Cisco IOS DHCP Server 35 lease T o configure the duration of the lease for an IP address that is assigned from a Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server to a DHCP client, use the lease DHCP pool configuration command. Use the no form of this command to restore the default v alue. lease { days [ hours ][ minutes ] | in?[...]

  • Page 36

    Command Reference 36 Release 12.0(1)T netbios-name-server T o configure NetBIOS W indows Internet Naming Service (WINS) name servers that are a vailable to Microsoft Dynamic Host Conf iguration Protocol (DHCP) clients, use the netbios-name-server DHCP pool configuration command. Use the no form of this command to remov e the NetBIOS name server l[...]

  • Page 37

    netbios-node-type Cisco IOS DHCP Server 37 netbios-node-type T o configure the NetBIOS node type for Microsoft Dynamic Host Conf iguration Protocol (DHCP) clients, use the netbios-node-type DHCP pool configuration command. Use the no form of this command to remov e the NetBIOS node type. netbios-node-type type no netbios-node-type Syntax Descript[...]

  • Page 38

    Command Reference 38 Release 12.0(1)T netw ork (DHCP) T o configure the subnet number and mask for a Dynamic Host Conf iguration Protocol (DHCP) address pool on a Cisco IOS DHCP Server , use the network DHCP pool configuration command. Use the no form of this command to remov e the subnet number and mask. network network-number [ mask | / pr efi[...]

  • Page 39

    next-server Cisco IOS DHCP Server 39 next-server T o configure the next server in a Dynamic Host Conf iguration Protocol (DHCP) client’ s boot process, use the next-server DHCP pool configuration command. Use the no form of this command to remov e the boot server list. next-server addr ess [ addr ess2 ... addr ess8 ] no next-server addr ess Syn[...]

  • Page 40

    Command Reference 40 Release 12.0(1)T option T o configure Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server options, use the option DHCP pool configuration command. Use the no form of this command to remov e the options. option code [ instance number ] { ascii string | hex string | ip addr ess } no option code [ instance number ] Synt[...]

  • Page 41

    option Cisco IOS DHCP Server 41 Related Commands ip dhcp pool[...]

  • Page 42

    Command Reference 42 Release 12.0(1)T service dhcp T o enable the Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server feature on your router , use the service dhcp global configuration command. Use the no form of this command to disable the Cisco IOS DHCP Server feature. service dhcp no service dhcp Syntax Description This command has no [...]

  • Page 43

    show ip dhcp binding Cisco IOS DHCP Server 43 show ip dhcp binding T o display address bindings on the Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server , use the show ip dhcp binding EXEC command. show ip dhcp binding [ addr ess ] Syntax Description Def aults None Command Modes EXEC Usage Guidelines This command first appeared in Cisco[...]

  • Page 44

    Command Reference 44 Release 12.0(1)T Related Commands clear ip dhcp binding[...]

  • Page 45

    show ip dhcp conflict Cisco IOS DHCP Server 45 show ip dhcp conflict T o display address conflicts found by a Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server when addresses are of fered to the client, use the show ip dhcp conflict EXEC command. show ip dhcp conflict [ addr ess ] Syntax Description Def aults None Command Modes EXEC [...]

  • Page 46

    Command Reference 46 Release 12.0(1)T show ip dhcp database T o display Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server database agent information, use the show ip dhcp database Pri vileged EXEC command. show ip dhcp database [ url ] Syntax Description Def aults If a URL is not specified, all database agent records are sho wn. Otherwi[...]

  • Page 47

    show ip dhcp database Cisco IOS DHCP Server 47 Related Commands ip dhcp database Read The last time bindings were read from the file server . Written The last time bindings were written to the file server . Status Indication of whether the last read or write of host bindings was successful. Delay The amount of time to wait before updating the dat[...]

  • Page 48

    Command Reference 48 Release 12.0(1)T show ip dhcp server statistics T o display Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server statistics, use the show ip dhcp serv er statistics EXEC command. show ip dhcp serv er statistics Syntax Description This command has no ar guments or ke ywords. Def aults None Command Modes EXEC Usage Guidel[...]

  • Page 49

    show ip dhcp server statistics Cisco IOS DHCP Server 49 Related Commands clear ip dhcp server statistics T able 5 show ip dhcp server statistics Field Descriptions Field Description Memory usage The number of bytes of RAM allocated by the DHCP server . Address pools The number of configured address pools in the DHCP database. Database agents The n[...]

  • Page 50

    Debug Commands 50 Release 12.0(1)T Deb ug Commands This section describes the following ne w debug command: • debug ip dhcp ser ver[...]

  • Page 51

    debug ip dhcp server Cisco IOS DHCP Server 51 deb ug ip dhcp server T o enable Cisco IOS Dynamic Host Conf iguration Protocol (DHCP) Server deb ugging, use the debug ip dhcp ser ver pri vileged EXEC command. Use the no form of this command to disable DHCP server deb ugging. debug ip dhcp ser ver { events | packets | linkage } no debug ip dhcp ser v[...]

  • Page 52

    Glossary 52 Release 12.0(1)T Glossary address binding —A mapping between the client’ s IP and hardware (MA C) addresses. The client’ s IP address may be configured by the administrator (manual address allocation) or assigned from a pool by the DHCP server (automatic address allocation). The binding also contains a lease expiration date. The [...]