This is very odd problem so place stay with me because it's very strange issue.
We have C3850 L3 core switch and we have created VLAN interface on it and we are using it for L3 routing.
I have other switches connected to C3850 core switches, so issue is if i send any traffic to any other server this switch forwarding that traffic to all its interface, just like SPAN port. ( We don't have any mirror session running on this switch)
Does anybody see this kind of issue in network? look like L3 flooding.
Look like this is happening Unicast Flooding: https://en.wikipedia.org/wiki/Unicast_flood
any idea what could be the issue of it?
After googling i found people saying reduce ARP timeout and increase MAC timeout, (Arp < Mac)
Cisco default Arp timeout is 4 hour, and Mac timeout is 300s (5min).
C3850#sh int port-channel 23 | in Timeout ARP type: ARPA, ARP Timeout 04:00:00
C3850#show mac address-table aging-time Vlan Aging Time Configured Aging Time ---- ---------- --------------------- Global Vlan Admin Age: 300
Should i change these values? what is the best practice?