Question : Cisco Vlan subnets & Managment vlan

I have a question, I have a customer who has 4 vlans, and they are all using the same subnet 192.168.0.x
Is this ok?  I was under the assumption that this would cause some serious problems but was told by the customer that the 2 cant talk to each other so all should be fine.

Also should i move the management vlan from 1 to something else? When the management vlan changes does vtp, cdp etc move to the new vlan or stay on 1?

Answer : Cisco Vlan subnets & Managment vlan

HI,,

- The vlan 1 is security hole, I advise to move it for example 99!
- Use L3 switch if it is possible to route the VLANs!
- if you want to separate a VLAN us vrf-lite:
    http://networkers-online.com/blog/2009/02/vrf-lite/  
    http://packetlife.net/blog/2009/apr/30/intro-vrf-lite/
- Always disable tfe cdp on PC ports
- ALway shutdown the ports that you don't use