Hi I think the DHCP database is great if you have to troubleshoot in DHCP server issues. This might be of help to you from Cisco website.


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.


Automatic bindings are IP addresses that have been automatically mapped to the MAC addresses of hosts that are found in the DHCP database. Automatic bindings are stored on a database agent. The bindings are saved as text records for easy maintenance.


An address conflict occurs when two hosts use the same IP address. During address assignment, DHCP checks for conflicts using ping and gratuitous ARP. If a conflict is detected, the address is removed from the pool. The address will not be assigned until the administrator resolves the conflict.


To configure a database agent and database agent parameters, 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.





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:



Command Purpose

Router(config)# no ip dhcp conflict logging

Disables DHCP address conflict logging.





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:



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.

http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html#wp1000961


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