Big subnet cause higher broadcast traffic within LAN/VLAN and that cause higher resource utalization. DHCP over the wan treated like unicast so nothing major in that case. Small subnets are recommanded within LAN to avoid higher level of broadcast.
For example suppose if you have single vlan for every request there will be broadcast since L2 works on broadcast basis and higher hardware resources will be used. DHCP over wan for that we use ip helper-address.
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...