Duplicate IP address warning

[moh24100]

Hi all,

I am using Aruba core switch 5406zl , Every day I see the  following  warning

IPv4: Duplicate IPv4 address 192.168.1.1 is detected on port 1/C7 in VLAN2 with a MAC address of xxxxxxxx.

I have checked the switch connected on this port there is no duplicate IP Address.

Note: mac address xxxxxx this for Core switch 

IP address 192.168.1.1 this gateway for vlan 2 on Core switch.

Thanks

[moh24100]

any insight?

[Linkk]

Hi,

please clarify your topology a little bit. Do you get this log message on the core switch, that has this IP? If yes, where does the interface C7 lead to? 

Please enter the following on the core and on the switch, that logs the message:

show arp | include 192.168.1.1

What does it return?

[moh24100]

Thanks for response 

yes i got message in core switch 

belwo  Arp command result :

show arp | include 192.168.1.1
192.168.1.100 xx089b-xxxxx dynamic Trk3
192.168.1.102 xxfeb5-xxxxx dynamic Trk2
192.168.1.106 xx23ae-xxxxx dynamic Trk2
192.168.1.109 xxbeb-xxxxx dynamic Trk2

[moh24100]

My network topology straight
All client switches connected to the core switch(uplink).

Note: This message appears only in early morning or late at night
But never appear during working hours.

Thanks

[netman63]

Do you know ended up happening with this issue you had?  I'm having the exact same thing going on where the 5406 reports a duplicate IP address out a specific port with it's own mac-address on it.  

Spent 2 hours with an engineer and then a senior engineer who also didn't quite know what would be causing it as everything seems to be configured correctly.  Was hoping you had resolved and could share what it may have been though it was years ago.