Configuration Assistance: splitting subnet into two

Unanswered Question
Feb 7th, 2008

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

interface fe1/0

ip address

interface fe1/1

ip address


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?

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
umedryk Wed, 02/13/2008 - 13:47

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

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


This Discussion