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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
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 Detection Method Detection time
172.16.1.32 Ping Feb 16 1998 12:28 PM
172.16.1.64 Gratuitous ARP Feb 23 1998 08:12 AM
Related Commands
clear ip dhcp conflict
ip dhcp ping packets
ip dhcp ping timeout
address (Optional) Specifies the IP address of the conflict found.
Table 3 show ip dhcp conflict Field Descriptions
Field Description
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.