I am designing my network to improve security and want to implement Vlans. My problem is that we already have a network 192.168.16.0/24 and have a lot of devices on this network already. From theory, I read that each Vlan has to be a different subnet and then I need to configure virtual interfaces on my Cisco router to cater for inter vlan routing.
1)How can I segment this network with minimum down time on the devices already on the network?
2)Can I just create Vlans and leave all these Vlans in the same laye 3 network so that they can go out of the network (I am not not concerned about Vlan routing) or I have to create subnets which means reconfiguring the existing devices (something I do not want)