Duplicate IP Address Catalyst 2960

[nriacone001]

I have two 2960's in this new environment that I am administering. I am receiving a message on one unit (Designate it 2960-2) of %IP-4-DUPADDR: Duplicate address 192.168.168.8 on Vlan1, sourced by 3037.a63e.540. The "sourced by" address is the 2960-1. I am new to the Cisco environment and do not know how these units were originally set up. How can I determine where the duplicate address is originating from.When I perform an ARP -a the address that corresponds to the 192.168.168.8 is the mac address of the ethersvi interface on the 2960-1. I know this should not be that difficult, but I am at a loss at this point.

Thanks in advance

[paul driver]

Hello Nicholas

It sounds like the duplicate address on originating from 2960-1.

If you know where at least one of interfaces this ip address resides, shut that interface down and then try to ping this address again, also

sh mac-address address 3037.a63e.540

From this you will able to trace the second interface which is conflicting.

res

Paul

Please don't forget to rate this post if it has been helpful.

[Matthew Frederick]

dont forget the pipe:

sh mac addr | i 3037.a63e.540

that will show you the port it is associated with. then do a:

sh cdp neigh fx/x detail

that will give you the ip of the device. once you remte into that device - repeat the mac address command until you get to the switch. once you remote into the 2960-1, do a:

config t

int vlan 1

ip address 192.168.168.x 255.255.255.0 (or whatever the subnet is)

no shut

and you should be good to go.

i hope i read that question right and answered it correctly for you : )

[Leo Laohoo]

MAC Address "3037.a63e.540" is a Cisco device.

So if you have two Cisco appliance in your environment, you may want to look at the second one.