1. If you break it up then your provider will have to change his mask and possibly his address depending on where the connecting link falls in your address scheme.
2. You do not give each port and address . You create a layer 3 SVI on the 3550 "interface vlan XX. You apply the address under the SVI . You then put the ports you want into that vlan that falls within that address range .
3. Your client subnet mask will be whatever the vlan subnet mask is when you break it up(mask determines how many hosts are in each subnet so this needs to be correct) and you will point the client default gateway to the layer 3 SVI address for that subnet .
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...