I am currently using a vlan that spans my entire campus as my management network. I like this because i can of corse have all my switch managment in one network. Also i like to have each of my distribution switches have the same last octet on every vlan they are on for ease of managment. For spanning tree issues i am trying to get rid of all my vlans that span the entire environment.
How are other people doing your managment network? i have thought about loopback addresses however the non layer 3 switches would have a issue getting this address out there.