by default arp entries remain in the arp cache for 14400 seconds (4 hours).
You can increase the arp timeout with configuring the following in interface configuration mode:
arp timeout (0-2147483)
So the maximum timeout is 2147483 seconds, which is roughly 24 weeks. I am not sure but usually there is a setting whereby the arp entry does not timeout at all, it could be if you set the timeout to 0.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...