Configuration Assistance: splitting subnet into two

[prabhdeepnijjar]

We want to take an ethernet subnet, say a /20, and split into separate

ethernet subnets (probably vlanned) for the purpose of further subnetting a range of

addresses in a diverse customer environment...

e.g. we want to do something like (vlan not part of this)

interface fe0/0

ip address 81.91.81.1 255.255.240.0

interface fe1/0

ip address 81.91.82.1 255.255.255.0

interface fe1/1

ip address 81.91.83.2 255.255.255.0

etc.

Obviously if you try this you will get an overlap error and IOS will not allow it.

Without a point to point interface for the /20, how can we do this?

[umedryk]

This cannot be done because the ip addresses are overlapped in the 255.255.240.0 subnet.

Try to use a different subnet mask and or different Network Number.