Cisco 32369 Manual page 45

show ip dhcp conflict
To display address conflicts found by a Cisco IOS Dynamic Host Configuration Protocol (DHCP)
Server when addresses are offered to the client, use the show ip dhcp conflict EXEC command.
show ip dhcp conflict [address]
Syntax Description
address
Defaults
None
Command Modes
EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 12.0(1)T.
The server detects conflicts using ping. The client detects conflicts using gratuitous Address
Resolution Protocol (ARP). If an address conflict is detected, the address is removed from the pool
and the address will not be assigned until an administrator resolves the conflict.
Examples
The following example displays the detection method and detection time for all IP addresses the
DHCP server has offered that have conflicts with other devices. Table 3 lists descriptions of the fields
in the example.
Router> show ip dhcp conflict
IP address
172.16.1.32
172.16.1.64
Table 3
Field
IP Address
Detection Method
Detection time
Related Commands
clear ip dhcp conflict
ip dhcp ping packets
ip dhcp ping timeout
(Optional) Specifies the IP address of the conflict found.
Detection Method
Ping
Gratuitous ARP
show ip dhcp conflict Field Descriptions
Description
The IP address of the host as recorded on the DHCP server.
The manner in which the IP address of the hosts were found
on the DHCP server. Can be a ping or a gratuitous ARP.
The time when the conflict was found.
Detection time
Feb 16 1998 12:28 PM
Feb 23 1998 08:12 AM
show ip dhcp conflict
Cisco IOS DHCP Server 45