I've been asked to setup a network with 9 VLANS and have been allocated an IP address of 10.0.0.0/21
I can create the first VLAN '10' as 10.0.0.1/21
When I go to create VLAN '20' as 10.0.1.1/21
I receive a 10.0.0.0 overlaps with Vlan '10'
I can only then add VLAN '20' as 10.0.8.1, although if I'm only allocated '10.0.0.0/21' would this still work? What would be best practice?
I'm using a CISCO 3960 Switch