IP DHCP Conflict in Catalyst 4500

[ferly0001]

Dear all,

I have a problem of dhcp conflict on my core switch cisco 4500 E.

Everyday i have found some of my IPPhone device get lost ip address, when i check in core that is so many ip dhcp conflict, so i type command clear ip dhcp conflict, after that my IPPhone can get IP address again. So everyday i should type that command. My range IP address is /23 and my IPPhone only 325 units.

Could you please give me the solution about this issue ? i attached the capture about the log and ios version

Thanks for your help

[johnd2310]

Hi, 

What is the lease period of your pool? Have you tried a smaller lease period?

Thanks

John

[ferly0001]

Hi Mark,

Thanks for your comment, i will try from guide that suggestion at weekend

Hi Johnd2310,

The lease period is default 1 day, i didn't try to make smaller lease period. Do you have any recommended lease period ?

[Mark Malone]

Hi

follow this guide it should help

http://blog.ipspace.net/2007/08/dhcp-conflict-logging-true-story.html

[Leo Laohoo]

Hold on, this chassis is running on 3.3.0E????

I'd upgrade the firmware first.  

[ferly0001]

Hi Leo,

running on 03.03.00.SG

[Mark Malone]

3.6.6 would be a more stable version than 3.3 , some of the earlier version had a lot of bugs , that release is 2012