I know that the Cisco's default ARP entry expiration is 240 minutes, however how does the ARP table mechanism work when a different MAC address is seen using the same IP?
In other words, if I move an IP to another device and the MAC associated with it therefore changes, isn't the ARP table on a Cisco switch going to overwrite that original ARP table entry immediately with the new MAC to IP association?
Take for example computer A is using 172.17.1.20 with MAC aaaa.bbbb.cccc. I then decommission computer A and give its IP 172.17.1.20 to computer B which has a MAC of 1111.2222.3333. When the switch sees traffic from computer b using 1111.2222.3333 won't it automatically update its ARP table entry to reflect this changed MAC associated with IP 172.17.1.20?