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
Switches / HubsNetworkingCisco
Last Comment
Don Johnston
8/22/2022 - Mon
Andy S
If you create your first VLAN '10' as 10.0.0.1/21 it's essentially using the IP's from 10.0.0.1 - 10.0.7.254
You'll need to break down the /21 you have into smaller subnets, The number of hosts you require in each network might help you determine the exact split. some might be small subnets, others might be larger..
Mal Osborne
There are a heap of ways this could be done. In the name of simplicity, I would probably use a /16 mask, and use the 2nd octet to select the VLAN.
You'll need to break down the /21 you have into smaller subnets, The number of hosts you require in each network might help you determine the exact split. some might be small subnets, others might be larger..