We have installed new Cisco 5500's in our network.  We're using VLANs.  I
am receiving a ton of Duplicate IP address messages now - every so often.
The format is:

(date) (time) 10.4.80.254   N Duplicate IP address 10.4.5.253 on
10.4.80.254 and 20.4.105.253.
(date) (time) 10.4.80.254   N Duplicate IP address 10.4.6.253 on
10.4.80.254 and 20.4.105.253.
(date) (time) 10.4.80.254   N Duplicate IP address 10.4.10.253 on
10.4.80.254 and 20.4.105.253.
etc......

Is this a NetView problem or Cisco switch problem??