On 11/30/11 12:59 AM, Fajar Priyanto wrote: > How fast the Switches can recognize the new mac? Any other pitfall? within seconds. or faster. and the client's ARP caches expire nearly as fast. its not the switches you care about as much as the DHCP leases for your clients. if you can copy the dhcp leases file over, that will save a lot of grief. -- john r pierce N 37, W 122 santa cruz ca mid-left coast