Remco,

The common design is to use /24 for LANs and /30 for point-to-point WAN/LAN links.

With that said, the subnet allocation is often driven by business requirement. For instance, if you create a server Vlan and the business requires to only have 13 servers on that Vlan, you aren't going to waste a /24 on it, do you?

Same can be said if the business has 300 servers and want all servers in the same Vlan, you need something bigger than a /24.

HTH,

__

Edison.

As a point of reference, 1000 hosts will completely saturate a 10Mb network with nothing but control traffic.

Stick with /24 and route where necessary.

If you go above /24 implement private-vlans to control your broadcasts.

I have done work on a campus network that is a /20 and it sucks ... avoid if at all possible.