Why? Why would one L2 3850 need an IP Helper address configured on it? It's already configured at the 'interface vlan X' level on the L3 core, which is directly connected to the L2 3850. Vlans trunked across, clients get IPs from the DHCP server, normal connectivity, APs get connected to the WLC, etc. But when it comes to imaging; only one L2 3850 needed an IP-Helper config of the same interface vlan we were imaging too.
I tried with 03.03.03, 03.06.06, 16.3.5b. Removed port security. Pinged clients. No interface errors, etc. The IP-Helper config on the L2 3850 resolved it. How does that make sense?
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