Show ip dhcp conflict, Syntax description, Defaults – Cisco 32369 User Manual

Page 45: Command modes, Usage guidelines, Examples, Table3 show ip dhcp conflict field descriptions, Related commands

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show ip dhcp conflict

Cisco IOS DHCP Server 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



Command Modes


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.


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

Detection Method

Detection time


Feb 16 1998 12:28 PM

Gratuitous ARP

Feb 23 1998 08:12 AM

Related Commands

clear ip dhcp conflict
ip dhcp ping packets
ip dhcp ping timeout


(Optional) Specifies the IP address of the conflict found.

Table 3

show ip dhcp conflict Field Descriptions



IP Address

The IP address of the host as recorded on the DHCP server.

Detection Method

The manner in which the IP address of the hosts were found
on the DHCP server. Can be a ping or a gratuitous ARP.

Detection time

The time when the conflict was found.