Can the same IP scheme be implemented to a new VLAN design?

[Alexander Torres]

Hello,

I have a one broadcast domain using, for example the 192.168.0.0/20 network. If a VLAN design is implemented, can the same IP scheme 192.168.0.0/20 be used or would it be something like 192.168.0.0/24 for the servers, 192.168.1.0/24 for the users, etc....?

Also, what determines the use of VLANS? For example, I've read that if the broadcast traffic is 20% or more then a VLAN design should be implemented. Or is it best practice to implement VLANS regardless of broadcast traffic?

Thank you,

Alex

[Reza Sharifi · Accepted solution]

Alex,

Usually the best practice is to use vlans and keep the broadcast domain small.  A common practice is to use a /24 subnet per vlan.  

192.168.0.0/24 vlan 10

192.168.1.0/24 vlan 11

192.168.2.0/24 vlan 12

and so on.

HTH