Your arp entry will timeout if you aren't sending traffic to it all of time time. The ip address on L2 switches are used for management only, and if you aren't pinging them all of the time, the entry will timeout in your L3 switches or routers. When you ping and it can't find it in the arp table, it will broadcast for the mac address that owns the address and that's where you'll get your reply from. The default arp timeout is generally 4 hours.
Switches will put a low priority on ping response behind more important processes it is running. This is not abnormally high , if you were getting like 200-300 ms then it might be something to look into . To test the switch itself you have to ping thru the switch to an attached device to get a ping response idea.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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