show ip dhcp conflict

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

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

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

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.

 

 

Related Commands

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

Cisco IOS DHCP Server 45

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Cisco Systems 32369 manual Show ip dhcp conflict, Router show ip dhcp conflict

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