New Cisco Core switch connected servers getting IP Conflicts

yakubpangat · ‎01-18-2015

Hi,

Recently we changed our core switch from Nortel Cisco WS-C4510R+E. After the migration Some of our server always getting ip conflict issue. So I checked in server log to know with which device is getting conflict. I got one mac address and I searched this mac address in core switch Mac table. I got the reply as below.

vlan     mac address     type        protocols               port
---------+---------------+--------+---------------------+-------------------------
   1      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
   2      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
   3      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
   4      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
   9      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
11      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
152      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
194      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
196      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
200      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
201      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
202      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
203      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
204      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
206      3c08.f6da.aaaa static ip,ipx,assigned,other Switch
207      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch
208      3c08.f6da.aaaa    static ip,ipx,assigned,other Switch

Hope your suggestion to solve this issue.

** Conflict is coming in vlan 11

** Network : 192.168.1.0

** My dhcp server : 192.168.1.46

** 192.168.1.0 ip pool disabled in dhcp

Vasilii Mikhailovskii · ‎01-19-2015

Hello.

I believe the feature is called "ip device tracking" - http://www.cisco.com/c/en/us/support/docs/ip/address-resolution-protocol-arp/118630-technote-ipdt-00.html

Try to disable it; if it doesn't help (make sure you didn't hit a bug, that do not allow you to disable it :)), please provide duplicate Ip-address log from any server.

yakubpangat · ‎06-15-2015

Thanks for your reply. When I moved that server interface to Fiber NIC. The issue solved