DHCP Problem

Unanswered Question
Jun 12th, 2007


This morning, I had outage for all the IPTs. We defined the DHCP pool for IPT VLAN in the core switch. As I checked on the logs, I saw a lot of DHCP address conflict messages. After I clear ip dhcp conflict in the core switch. Everything back to normal. Does anyone know what was caused the problem?



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smothuku Tue, 06/12/2007 - 22:10

Hi SAM ,

Can you paste the error messages whcih were displaying on switch ..



anandramapathy Tue, 06/12/2007 - 23:09

If you have created multiple DHCP scopes ( maybe on different switches ) then ensure that they do nto clash with each other.

example -

switch 1 to

switch 2 / server to

sam-lee Tue, 06/12/2007 - 23:18

%DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged

smothuku Tue, 06/12/2007 - 23:35

Hi Sam ,

1. %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged [IP_address].

The DHCP server has detected an address conflict. Another host is using the specified IP address.

Recommended Action: Resolve the misconfiguration. Clear the conflict from the DHCP database. After resolving the conflict, enter the clear ip dhcp conflict command.

Related documents- No specific documents apply to this error message.



sam-lee Tue, 06/12/2007 - 23:42

Hi Satish,

I did check that error msg in the error msg decoder. I know how to solve it...but i dont know what was the reason caused the problem. And how are we going to prevent this problem to happen again?



ivan.garrido Mon, 01/28/2008 - 07:36


Today, in the morning, We had the same problem in a customer. I think that a cause could be DHCP snooping..Did you try this on the network?


Ivan Garrido.


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