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Configuring DHCP
DHCP Configuration Task List
IPC-69
Cisco IOS IP Configuration Guide
Configuring a DHCP Database Agent or Disabling DHCP Conflict Logging
A DHCP database agent is any host—for example, an FTP, TFTP, or rcp server—that stores the DHCP
bindings database. You can configure multiple DHCP database agents and you can configure the interval
between database updates and transfers for each agent. To configure a database agent and database agent
parameters, use the following command in global configuration mode:
If you choose not to configure a DHCP database agent, disable the recording of DHCP address conflicts
on the DHCP Server. To disable DHCP address conflict logging, use the following command in global
configuration mode:
Excluding IP Addresses
The DHCP Server assumes that all IP addresses in a DHCP address pool subnet are available for
assigning to DHCP clients. You must specify the IP address that the DHCP Server should not assign to
clients. To do so, use the following command in global configuration mode:
Configuring a DHCP Address Pool
You can configure a DHCP address pool with a name that is a symbolic string (such as “engineering”)
or an integer (such as 0). Configuring a DHCP address pool also places you in DHCP pool configuration
mode—identified by the (dhcp-config)# prompt—from which you can configure pool parameters (for
example, the IP subnet number and default router list). To configure a DHCP address pool, complete the
required tasks in the following sections.
Configuring the DHCP Address Pool Name and Entering DHCP Pool Configuration Mode
To configure the DHCP address pool name and enter DHCP pool configuration mode, use the following
command in global configuration mode:
Command Purpose
Router(config)# ip dhcp database url
[timeout seconds | write-delay seconds]
Configures the database agent and the interval between database updates
and database transfers.
Command Purpose
Router(config)# no ip dhcp conflict logging
Disables DHCP address conflict logging.
Command Purpose
Router(config)# ip dhcp excluded-address
low-address [high-address]
Specifies the IP addresses that the DHCP Server should not assign to
DHCP clients.
Command Purpose
Router(config)# ip dhcp pool name
Creates a name for the DHCP Server address pool and places you in DHCP
pool configuration mode (identified by the dhcp-config# prompt).