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IP VLAN Overlapping

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Last Modified: 2015-10-01
Hi All,

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
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